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39results about How to "Avoid cascading failures" patented technology
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Cascading failure search and weak link analysis method based on operation reliability model
ActiveCN106327034ASimplify the difficulty of research questionsDifficulty of SimplificationResourcesCascading failurePower flow
The invention relates to a cascading failure search and weak link analysis method based on an operation reliability model. The method comprises steps: initial failure is generated randomly; a DC power flow is calculated, whether a load threshold-crossing line exists in a power system is judged, if yes, a next step is carried out, or otherwise, the operation is stopped; an initial failure set is generated, and through the operation reliability model, the threshold-crossing line outage probability is calculated; the power system state probability is calculated; if the power state probability is larger than a set threshold and the failure scale is smaller than a set threshold, the power state is added to an alternative failure set, and if no state meeting the condition exists, search is stopped; the initial failure set is taken as an alternative failure set, the current alternative failure set is emptied, and the above steps are repeated. Through searching a cascading failure event in different initial failure and analyzing a system weak link, a corresponding system reform scheme is provided, happening of the cascading failure is prevented, a subsequent event is found during an event development process, and further evolution of the cascading event can be prevented.
Owner:CHINA ELECTRIC POWER RES INST +3
Power system cascading failure simulation method based on unified power flow controller
ActiveCN103311926AIn line with actual operating conditionsPracticalSpecial data processing applicationsAc network circuit arrangementsCascading failureSimulation
The invention provides a power system cascading failure simulation method based on a unified power flow controller and belongs to the technical field of power system security and reliability protection. A computer is used for determining the installation position of the unified power flow controller in a power system firstly, determining an active power flow betweenness threshold value of each node of the power system, performing power system cascading failure simulation based on the unified power flow controller and finally calculating measurement index for reflecting severity of cascading failure through procedures. The power system cascading failure simulation method gives consideration to power flow directivity and the operation mode of the system, optimizes the installation position for installing the unified power flow controller, effectively performs line parameter regulation while meeting safe operation constraints of the power system, and can reflect the propagation process of the cascading failure of the power system actually. The power system cascading failure simulation method based on the unified power flow controller can be widely applied to the cascading failure simulation of the power system, is particularly suitable for the cascading failure simulation of a large-scale complicated power system, and provides a scientific basis for preventing occurrence of the cascading failure of the power system.
Owner:CHONGQING UNIV
Mechanical automatic stop device of wire coil machine
ActiveCN110844708AGuaranteed uptimeAvoid cascading failuresFilament handlingElectric machineryStructural engineering
The invention discloses a mechanical automatic stop device of a wire coil machine. The mechanical automatic stop device comprises a mounting plate, a length measuring unit, a pressing unit, an abnormity detecting unit and an emergency stop unit, wherein the back side surface of the mounting plate is fixedly connected with a motor; an output shaft of the motor penetrates through a through hole of the mounting plate; the front end of the output shaft of the motor is fixedly connected with a mounting shaft; the back end of the outer arc surface of the mounting shaft is fixedly connected with a brake disc; the middle part of the front side surface of the mounting plate is fixedly connected with a third fixed plate; the left side surface of the third fixed plate is fixedly connected with an electric push rod; the left end of the electric push rod is fixedly connected with a brake pad; the brake pad is of an arc structure; the inner arc surface of the brake pad is corresponding to the outerarc surface of the brake disc; and the back end of the front side surface of the mounting plate is fixedly connected with a support plate. The mechanical automatic stop device of the wire coil machineis novel in structure, needs no external equipment to measure the length of a cable, can automatically take corresponding stop measures according to different conditions, and is high in safety and convenient to operate.
Owner:泰州市赛鸥网业有限公司
Status estimating and coordinating method of wide-area power system
InactiveCN103199528AImprove estimation accuracyEasy to controlAc network circuit arrangementsWide areaElectric power system
The invention relates to the field of control of a power system, and discloses a status estimating and coordinating method of a wide-area power system, aiming at solving the problem that the voltage and the power at the boundary nodes are not matched with each other during power transmission system status estimation and power distribution network status estimation. The status estimating and coordinating method of the wide-area power system mainly comprises the following steps of: 1. decoupling a power system region; 2. modeling a local area network; 3. measuring configuration and functions of a system; 4. estimating the status of an aggregation system; and 5. determining end conditions: if the aggregation system meets the end conditions, stopping the status estimation of the aggregation system and outputting results; and if the aggregation system does not meet the terminal conditions, returning to the step 4 till the aggregation system meets the end conditions. After the method is used, the problem that the voltage and the power are not matched with each other in the links of power transmission and power distribution in the prior art can be solved, the power grid status estimation is high in precision, and the real-time monitoring and controlling of the power transmission link and the power distribution link of the power system can be realized.
Owner:SOUTHWEST JIAOTONG UNIV
Electric power system protection and control method based on risk assessment
InactiveCN104156879AImprove reliabilityAvoid cascading failuresData processing applicationsElectric power systemPower grid
The invention discloses an electric power system protection and control method based on a risk assessment. The method comprises the following steps: carrying out the risk assessment on an electric power system, and calculating power network risk values; establishing a protection and control object function; inputting electric power system running states and parameters; and according to the protection and control object function and the power network risk values, formulating electric power system protection and control measures. According to the invention, risk theories are applied to the protection and control of the electric power system, the problem of formulating protection and control measured by reliance on experience of dispatchers is solved, and quantifiable measures can be obtained by use of the method so as to effectively realize safety protection and control of the electric power system. Besides, the method, on the basis of the risk assessment, takes control cost into consideration in an integrated approach, draws up the protection and control object function and formulates the quantifiable protection and control measures according to the object function so as to reduce the control cost as much as possible under the condition that safety protection of the electric power network is realized.
Owner:ELECTRIC POWER SCHEDULING CONTROL CENT OF GUIZHOU POWER GRID CO LTD +1
Power system cascading failure analysis method based on Markov process
ActiveCN106327033AImprove power supply capacityGuaranteed Computational EfficiencyResourcesCascading failureFailover
The invention relates to a power system cascading failure analysis model and probability calculation method based on a Markov process. The method comprises the following steps of: differentiating operation characteristics of different components of a power system, and, in combination with state information of the power system, where system components are, analyzing the shutdown probability of the components; considering the correlation between failure events in a cascading failure evolutionary process, describing a cascading failure transfer process through the Markov process, searching a cascading failure event of the system under different initial failure conditions, establishing a cascading failure event model, and generating a power system cascading failure state space in the Markov process; and, analyzing the system transfer probability in a cascading failure state space, and calculating the different-scale cascading failure probability. According to the method disclosed by the invention, while the calculation efficiency is ensured, the cascading failure event of the system under different initial failures is discovered; furthermore, the cascading failure probability is calculated; a corresponding system improvement measure is provided; the cascading failure is prevented; the system risk is reduced; and the power supply capability of the power system is increased.
Owner:CHINA ELECTRIC POWER RES INST +3
Cloud management using a component health model
ActiveUS20140195853A1Avoid cascading failuresPrevents cascading failureDetecting faulty hardware by remote testFunctional testingUser ErrorSoftware
Embodiments are directed to establishing a model for testing cloud components and to preventing cascading failures in cloud components. In one scenario, a computer system models identified cloud components (including cloud hardware components and / or cloud software components) as health entities. Each health entity is configured to provide state information about the cloud component. The computer system establishes declarative safety conditions which declaratively describe cloud computing conditions that are to be maintained at the identified cloud components. The computer system then tests against the declarative safety conditions to determine which cloud components are or are becoming problematic. Upon determining that an error has occurred, the computer system notifies users of the error and the component at which the error occurred. Guarded interfaces are established to ensure that actions taken to fix the error do not cause further failures.
Owner:MICROSOFT TECH LICENSING LLC
Method for simulating power grid interlocking fault based on complicated network theoretical calculation and correction control
ActiveCN104638646AOvercoming the flaws described by cascading failuresIn line with actual operating conditionsContigency dealing ac circuit arrangementsSpecial data processing applicationsSimulationPower grid
The invention relates to a method for simulating a power grid interlocking fault based on complicated network theoretical calculation and correction control, and belongs to the technical field of safety and reliability protection of power systems. The method comprises the following steps of utilizing a computer, and performing procedures; firstly, calculating the optimum trend of a power system under the normal condition; calculating the betweenness of each node, determining a betweenness threshold value of each node of the power system, simulating the interlocking fault of the power system, and finally calculating the total loss load of the interlocking fault. The method has the advantages that under the condition of meeting the safety running constraint requirement of the power system, the influence of correction control on the interlocking fault can be simulated by adjusting the output power and reduced load of a power generator, the influence of the change of load distribution on the interlocking fault can be reflected, and the propagation process of the interlocking fault of the power system can be well reflected; the method is widely applied to simulate the interlocking fault of the power system, is particularly suitable for simulating the interlocking fault of large complicated power systems, and can provide scientific basis for preventing the occurrence of the interlocking fault of the power system.
Owner:CHONGQING UNIV
Compound dynamic power supporting system and method thereof
ActiveCN109687473AImprove stability and securityAvoid cascading failuresAc network load balancingPower oscillations reduction/preventionSupporting systemUltra high voltage
The invention provides a compound dynamic power supporting system and a method thereof. The compound dynamic power supporting system comprises a phase modifier (1), an energy storage system, a phase modifier local regulating and control device (5), an energy storage local regulating and control device (6) and a power integrated dispatching management system (7), wherein an alternating current outlet of the energy storage system and an alternating current outlet of the phase modifier (1) are connected to access an alternating current network at the receiving end of an ultra high voltage directcurrent power transmission system; the power integrated dispatching management system (7) is connected with a power grid dispatching system, and receives dispatching instructions from the power grid dispatching system. According to the compound dynamic power supporting system, a mode combining local control and centralized control is adopted, the reactive power supporting capacity of the phase modifier (1) is integrated with the fast active power response capacity of the energy storage system, active and reactive power supporting is provided for the alternating current network at the receivingend in the process of direct current blocking of an ultra high voltage direct current power transmission converter valve, and the safe and stable operation ability of traditional alternating currentpower grids after being accessed to the ultra high voltage direct current power transmission system is improved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
Active and reactive coordination control method for cluster wind power plant based on power balance theory
InactiveCN102916449AAvoid cascading failuresAvoid disconnection issuesSingle network parallel feeding arrangementsWind energy generationPower balancingPower Balance
The invention discloses an active and reactive coordination control method for a cluster wind power plant based on a power balance theory. An active and reactive adaptation control method for the cluster wind power plant under steady state power fluctuation is provided; and after a power grid fails in transient state, the cluster wind power plant can quickly realize active and reactive coordination control by combining a security control strategy and the power balance theory. The method does not depend on a topological structure of the power grid in a wind power access place, and active and reactive adaptation balance under the steady state of the cluster wind power plant can be realized according to real-time sampled data under the current running mode of the power grid and the power balance theory; furthermore, coordination control in the active and reactive transient state of the cluster wind power plant is not realized until a total active and reactive control amount cut off by the security control system under different running modes of the power grid is counted; and moreover, active and reactive coordination control is realized by combining an active actual change situation and a reactive actual change situation of the system before and after failure.
Owner:邵俊松 +1
Leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method
ActiveCN104361247AReduce vulnerabilityReduce load lossSpecial data processing applicationsCascading failurePower grid
The invention discloses a leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method. The leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method specifically comprises the following steps of (1) describing a leader-follower game process between an electric power system relevant department and a system fault through a defender-attacker-defender three-layer model; (2) establishing a leader-follower game model for making an active defense strategy of the alternating current and direct current hybrid electric power system; (3) solving the D-A-D (Defender-Attacker-Defender) three-layer model; (4) enabling an optimal active defense strategy obtained from the step (3) of the electric power system to perform active defense on the alternating current and direct current hybrid electric power system. The leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method of the invention accurately determines a current fragile source for the electric power system under the condition that fault cannot be foreseen, adopts the corresponding active defense strategy and accordingly prevents generation of cascading failure.
Owner:STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
Power grid N-k analyzing method based on relay protection system hidden failures
ActiveCN103904624AStrengthen key monitoringAvoid cascading failuresEmergency protective circuit arrangementsSpecial data processing applicationsPower gridOccurrence probability
The invention belongs to the field of power system relay protection and power grid cascading failure analysis and discloses a power grid N-k analyzing method based on relay protection system hidden failures. The method comprises the step of analyzing several typical hidden failure models of a relay protection system, the step of establishing solving models of various hidden failure trigger probabilities according to the hidden failure models, the step of carrying out the expected analysis on the power grid N-k according to the timing sequence characteristics of the hidden failure models to obtain the power grid N-k failure path and occurrence probability caused by the protection hidden failures. The method takes multiple types of protection hidden failures into consideration, the power grid N-k failure occurring and expanding process can be analyzed in the aspect of mechanism, the calculating accuracy of the N-k failure probabilities is improved, more N-k failure paths are found, and the limitation of a traditional N-k analysis method is compensated.
Owner:POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
Current sensorless grid access current control method applicable to grid-connected inverter
ActiveCN108448613AImprove safe operationStrong adaptability to inconsistencySingle network parallel feeding arrangementsPhotovoltaic energy generationGrid connected inverterLoop control
The invention relates to a current sensorless grid access current control method applicable to a grid-connected inverter, and relates to a system which consists of a grid-connected inverter main circuit and a grid-connected inverter control circuit; the grid-connected inverter control circuit comprises a grid access current open loop control module and a PWM generation module; the grid access current open loop control module comprises a first proportional regulator, a second proportional regulator, a time-delay device and an summator; the input ends of the first proportional regulator and thesecond proportional regulator are both led out to be used as the grid access current reference signal input end; the output end of the first proportional regulator is connected with the input end of the summator; the output end of the second proportional regulator is connected with the input end of the time-delay device; the output end of the time-delay device is connected with the input end of the summator; and the output end of the summator is connected with the PWM generation module. By virtue of the open loop current control method adopted by the system, non-static-error tracking of the grid access current reference signal by the grid access alternating current can be realized, and the severe operation conditions of power grid harmonic, imbalance and fault can be adapted.
Owner:SOUTHEAST UNIV
Reactive power compensation device control method for preventing large-scale chain offline of wind generation sets
ActiveCN103532520AAvoid Overvoltage ProblemsAvoid cascading failuresContinuous tuning detailsElectricityPower compensation
The invention discloses a reactive power compensation device control method for preventing large-scale chain offline of wind generation sets and belongs to the technical field of wind power generation. The reactive power compensation device control method comprises the following steps: a low-voltage running limit of reactive power compensation devices is set and when the voltage of a grid connection point is lower than the low-voltage running limit, that a power grid fault occurs is judged, and a grid connection switch is automatically disconnected; after the fault is removed, input commands are issued to part of the reactive power compensation devices by a system control center according to the network operation state to ensure that the voltage rapidly returns to the standard value. Through the adoption of the method, the fault of a wind power system can be effectively prevented from being expanded and the chain faults are prevented.
Owner:STATE GRID ELECTRIC POWER RES INST +1
Service interface resource isolation configuration method and device and computer equipment
PendingCN112631770AAvoid cascading failuresImprove distribution efficiencyResource allocationHardware monitoringResource isolationDependability
The invention discloses a service interface resource isolation configuration method and device and computer equipment, and the method comprises the steps: starting a service program according to a service starting instruction, carrying out the isolation configuration of system resources according to a plurality of service interfaces contained in the service program, receiving a service request, and inputting the service request into an isolation bulkhead of the service interface for processing, and performing state monitoring on the isolation bulkheads to obtain state monitoring information, obtaining a resource configuration coefficient of each isolation bulkhead according to the resource adjustment analysis model and the state monitoring information, and updating and configuring system resources of each isolation bulkhead. The invention is based on a system resource monitoring technology, belongs to the technical field of cloud monitoring, and can perform isolation configuration on system resources of a management server according to a service interface and perform update configuration on the system resources of each isolation bulkhead according to state monitoring information in the process of processing a service request. Cascading faults between service interfaces can be avoided, the distribution efficiency of system resources is improved, and the reliability of the management server is improved.
Owner:PINGAN PUHUI ENTERPRISE MANAGEMENT CO LTD
Method for searching key failure nodes in power heterogeneous communication network system
InactiveCN106027301AAvoid cascading failuresImprove reliabilityData switching networksComplex networkKey issues
The invention relates to a method for searching key failure nodes in a power heterogeneous communication network system. A self-organized critical theory of a complex network is introduced into the method; furthermore, key network nodes causing conversion of a power heterogeneous communication network from a self-organized state to a critical state can be found by using an iterative method; therefore, a large-area cascading failure of the network can be avoided; and the reliability of the power communication network system is improved. The method comprises the following steps of: judging whether the network satisfies the complexity or not; performing regional division of the large power heterogeneous communication network; searching nodes in the divided regional network so as to find out key failure nodes; rapidly recovering the key failure nodes or making a key failure node cut-off scheme; and searching other triangular divided local network areas.
Owner:国网江西省电力有限公司经济技术研究院 +1
Power transfer solving method under grid failure state
The invention relates to a power transfer solving method under a grid failure state, aiming at a grid provided with a wide area measurement system (WAMS). An overlay principle is utilized, and the network state in normal operation is overlaid with the state of a single-power failure additional network only under the action of failure power supply so as to obtain network power distribution after a failure circuit is removed and further solve for a power transfer amount on a non-failure circuit. A great deal of simulation test results show that the method can accurately solve for the power transfer amount under the grid failure state and solve the key technical problems that non-convergence easily occurs and solving can not achieved in the traditional tide solving. The power transfer solving method under the grid failure state can effectively solve the power amount transferred to the non-failure circuit after failure occurs to a transmission line, and is still effective even under the condition that network tide can not be converged after the failure.
Owner:CHONGQING UNIV
Ship fire extinguishing system cascading failure evaluation method for distributed intelligence control
InactiveCN103440728AImprove accuracy and reliabilityExtreme disaster reductionFire alarm electric actuationFire alarm smoke/gas actuationShip safetyFuzzy control system
The invention relates to a ship fire extinguishing system cascading failure evaluation method for distributed intelligence control. The method carries out distributed intelligence control on an existing ship fire extinguishing system on the basis of fuzzy control, builds cascading failure indexes of the ship fire extinguishing system and judges the cascading failure situation. The method includes the steps that a ship cabin is divided into three kinds according to the fire danger degree, information of four parameters undergoes normalization preprocessing, a fire alarm grade evaluation result of the ship cabin is obtained, and a main machine judges the alarm degree of the ship cabin. The method can improve reliability and accuracy of an automatic fire alarm system of the ship cabin, improve the ability to avoid cascading failures and similar extreme disasters, and reduce occurrence of the extreme disasters. According to the method, due to the fact that fire characteristics of the ship cabin are taken into consideration, chain alarm is achieved. Therefore, the method can well facilitate ship environment, improve ship safety and enhance practicality.
Owner:HARBIN ENG UNIV
DC-DC power supply device
InactiveCN104935166AIncrease the switching frequencyReduce volumeEfficient power electronics conversionApparatus with intermediate ac conversionTransformerLow voltage
The invention relates to a DC-DC power supply device. The DC-DC power supply device comprises a tri-level voltage reducing circuit and an isolating circuit, wherein the input end of the tri-level voltage reducing circuit is connected to an input power supply, and the output end of the tri-level voltage reducing circuit is connected to the input end of the isolating circuit; and the output end of the isolating circuit is connected with a load. By adopting the circuits provided by the invention, switch tubes with lower voltage classes can be used, and then the switching frequency of the switch tubes are improved to the maximum extent, the sizes and weights of transformers, inductors and the like are reduced, the cost is reduced, volume production is facilitated, and the system safety operation on a low output voltage side is guaranteed.
Owner:O&C ELECTRIC TECHN CO LTD
Variable-weight weighted power flow entropy calculation method based on load interval division
PendingCN111756041AReflect physical propertiesAvoid cascading failuresAc networks with different sources same frequencyPower flowControl engineering
The invention discloses a variable-weight weighted power flow entropy calculation method based on load interval division, and the method comprises the steps: setting a line load limit through combining with the operation requirements of a power network, and determining the load rate step length of power flow entropy calculation; dividing the line load rate into a plurality of intervals according to the probability distribution condition of the line load rate; independently calculating the power flow entropy of each interval based on the variable weight weighted power flow entropy; and finally,superposing to obtain the system power flow entropy. The method comprises the following steps: amplifying the influence of light and heavy load lines on the system power flow entropy in a variable load interval, so that the influence of light and heavy load lines on the system can be effectively distinguished, the purposes of accurately and effectively reducing the load of the heavy load line andimproving the network topology optimization of the load of the light load line are achieved, and then network cascading failures and line capacity waste of the power system are avoided.
Owner:HOHAI UNIV
Farmland wireless sensor network and communication method
ActiveCN111294747AAvoid cascading failuresHigh feasibilityParticular environment based servicesNetwork topologiesTelecommunicationsSensor node
The invention relates to a farmland wireless sensor network and a communication method, and belongs to the technical field of wireless sensors. The wireless network comprises a collection node locatedin the center of a communication area and sensor nodes around the collection node; a plurality of layers of annular regions are formed around the collection node; the sensor nodes are distributed ineach annular region; during networking, a first communication channel is established between the sensor node in the innermost annular region and the collection node, and a first communication channelis established between the sensor nodes in other annular regions and at least one sensor node in the adjacent inner annular region; a second communication channel is established between each sensor node and at least one sensor node in the annular region where the sensor node is located; after obtaining the data, each sensor node transmits the data through the first communication channel at a firstset probability and transmits the data through the second channel at a second set probability; if one communication channel fails, data is transmitted through the other communication channel; the first set probability is greater than the second set probability.
Owner:HENAN UNIV OF SCI & TECH
Internet of Things cloud platform for wastewater purification treatment
PendingCN112015128AImprove processing managementBe informed in timeProgramme control in sequence/logic controllersMonitor equipmentOperating system
The invention discloses an Internet of Things cloud platform for wastewater purification treatment, which comprises a management terminal for monitoring and managing the operation of wastewater treatment equipment and a service terminal for acquiring operation and maintenance states of all sites needing to be served, receiving a maintenance service request of the management terminal and generatinga maintenance order number according to the early warning service number. The management terminal mainly comprises an equipment management module for establishing and storing an electronic file of the wastewater treatment equipment and recording maintenance and repair data of the wastewater treatment equipment, an operation monitoring module for monitoring the operation state and the operation environment of the wastewater treatment equipment and uploading monitoring data to the management terminal in real time, a fault alarm module for setting different fault parameter thresholds for the wastewater treatment equipment, triggering a threshold range, automatically giving an alarm and generating an early warning service number. A converged communication module is arranged between the management terminal and the service terminal. An after-sales maintenance platform which can monitor equipment operation on line, automatically position faults and realize economy, accuracy and high efficiency can be provided.
Owner:上海顺樊环保科技有限公司
Simulation method of grid cascading faults based on complex network theory and corrective control
ActiveCN104638646BOvercoming the flaws described by cascading failuresIn line with actual operating conditionsContigency dealing ac circuit arrangementsSpecial data processing applicationsSimulationPower grid
Owner:CHONGQING UNIV
Short-circuit current suppression device based on phase change resistor
PendingCN112736880AReduce short circuit levelReduce thermal effectsEmergency protective arrangements for limiting excess voltage/currentVoltage sagControl theory
The invention relates to a short-circuit current suppression device based on a phase-change resistor, the device comprises the phase-change resistor connected in series on a distribution line, the phase-change resistor comprises a phase-change layer and an electrode, and the electrode is connected with a pulse signal, and the device has the advantages that the phase-change resistor is connected in series on the distribution line and comprises the phase-change layer, the phase change layer is easy to realize conversion from a crystalline state to an amorphous state, so that the resistance of the phase change resistor is changed, the current of the distribution line is changed, the short-circuit level of the distribution line can be effectively reduced, the damage of the heat effect and the electrodynamic effect of short-circuit current to distribution equipment is reduced; the requirement on the breaking capacity of a circuit breaker can be reduced, the voltage sag degree caused by a short-circuit fault can be reduced before a fault loop of the circuit breaker is cut off, the power utilization continuity of a sensitive load is improved, and economic loss brought to a user is reduced.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JINHUA POWER SUPPLY CO +2
Cascading fault search and weak link analysis method based on operational reliability model
ActiveCN106327034BSimplify the difficulty of research questionsDifficulty of SimplificationResourcesCascading failurePower flow
The invention relates to a cascading failure search and weak link analysis method based on an operation reliability model. The method comprises steps: initial failure is generated randomly; a DC power flow is calculated, whether a load threshold-crossing line exists in a power system is judged, if yes, a next step is carried out, or otherwise, the operation is stopped; an initial failure set is generated, and through the operation reliability model, the threshold-crossing line outage probability is calculated; the power system state probability is calculated; if the power state probability is larger than a set threshold and the failure scale is smaller than a set threshold, the power state is added to an alternative failure set, and if no state meeting the condition exists, search is stopped; the initial failure set is taken as an alternative failure set, the current alternative failure set is emptied, and the above steps are repeated. Through searching a cascading failure event in different initial failure and analyzing a system weak link, a corresponding system reform scheme is provided, happening of the cascading failure is prevented, a subsequent event is found during an event development process, and further evolution of the cascading event can be prevented.
Owner:CHINA ELECTRIC POWER RES INST +3
A composite dynamic power support system and method thereof
ActiveCN109687473BImprove stability and securityAvoid cascading failuresAc network load balancingPower oscillations reduction/preventionAlternating currentHigh voltage
The present invention proposes a composite dynamic power support system and method thereof, including a controller (1), an energy storage system, a controller (5), an energy storage controller (6) and comprehensive power dispatch management The system (7), wherein the AC outlet of the energy storage system is connected to the AC outlet of the condenser (1) and then connected to the AC power grid at the receiving end of the UHVDC transmission system; the power integrated regulation and control management system (7) is connected to the power grid dispatching system , to accept dispatching instructions from the grid dispatching system. The system adopts the combination of local control and centralized control, and integrates the reactive power support capability of the condenser (1) with the fast active power response capability of the energy storage system. Provide active and reactive power support for the AC power grid at the receiving end, and improve the safe and stable operation capability of the traditional AC power grid after being connected to the UHV DC transmission system.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
Battery pack
PendingCN107834632AEliminate potential safety hazardsEasy to findCharge equalisation circuitElectric powerElectrical batteryElectronic switch
A battery pack provided by the present invention comprises a plurality of battery sets which are in series connection, heat-insulated and fireproof sheet metals, an active equalization system in corresponding arrangement with each battery set, an overcharging and overdischarging protection switch and a total controller. The plurality of battery sets are in layered and superposed arrangement, the sheet metals are arranged between the adjacent two layers of battery sets and are attached to and connected with the layers of battery sets to which the cathodes face, the intumescence fire-retardant coatings are coated on the surfaces facing the cathodes of the battery sets or are coated on both the surfaces, and the total controller controls the active equalization systems and the overcharging and overdischarging protection switch. The active equalization systems of the battery pack enable the voltage difference of the battery sets during the charging and discharging processes to be reduced effectively, thereby preventing the battery pack from being overcharged and overdischarged. Meanwhile, no electrical / electronic switch is used in the battery pack to control a current loop, thereby eliminating the potential safety hazards brought by that a current flows through the electrical / electronic switch to generate the heat.
Owner:威艾能源(杭州)有限公司
A control method of reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid
ActiveCN103532520BAvoid Overvoltage ProblemsAvoid cascading failuresContinuous tuning detailsCascading failurePower compensation
The invention discloses a control method of a reactive power compensation device for preventing large-scale wind turbines from being disconnected from the grid, and belongs to the technical field of wind power generation. The invention sets the limit value of the low-voltage operation of the reactive power compensation device. When the voltage of the grid-connected point is lower than the value, it is judged that the grid is faulty, and the grid-connected switch will be automatically disconnected; after the fault is removed, the system control center will operate according to the network The state issues input commands to some reactive power compensation devices to ensure that the voltage quickly returns to the standard value. The invention can effectively avoid expansion of wind power system faults and prevent cascading faults.
Owner:STATE GRID ELECTRIC POWER RES INST +1
Active defense strategy formulation method for AC/DC hybrid power system based on master-slave game
ActiveCN104361247BReduce vulnerabilityReduce load lossSpecial data processing applicationsCascading failurePower grid
The invention discloses a leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method. The leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method specifically comprises the following steps of (1) describing a leader-follower game process between an electric power system relevant department and a system fault through a defender-attacker-defender three-layer model; (2) establishing a leader-follower game model for making an active defense strategy of the alternating current and direct current hybrid electric power system; (3) solving the D-A-D (Defender-Attacker-Defender) three-layer model; (4) enabling an optimal active defense strategy obtained from the step (3) of the electric power system to perform active defense on the alternating current and direct current hybrid electric power system. The leader-follower game alternating current and direct current hybrid electric power system active defense strategy making method of the invention accurately determines a current fragile source for the electric power system under the condition that fault cannot be foreseen, adopts the corresponding active defense strategy and accordingly prevents generation of cascading failure.
Owner:STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
A sensorless grid-feed current control method suitable for grid-connected inverters
ActiveCN108448613BImprove safe operationStrong adaptability to inconsistencySingle network parallel feeding arrangementsPhotovoltaic energy generationGrid-tie inverterLoop control
The invention relates to a current sensorless grid-connected current control method suitable for a grid-connected inverter, and relates to a system composed of a main circuit of a grid-connected inverter and a control circuit of a grid-connected inverter. The circuit includes a grid current open-loop control module and a PWM generation module, the grid current open-loop control module includes a first proportional regulator, a second proportional regulator, a delayer and an adder, the first proportional regulator and the second proportional regulator The input terminals of the regulators are all taken out as the input terminals of the input current reference signal, the output terminal of the first proportional regulator is connected to the input terminal of the adder, the output terminal of the second proportional regulator is connected to the input terminal of the delayer, and the delayer The output end of the adder is connected to the input end of the adder, and the output end of the adder is connected to the PWM generating module. The open-loop current control method adopted by this system can realize the grid-incoming AC current without static difference to track the grid-incoming current reference signal, and can adapt to harsh operating scenarios such as grid harmonics, unbalance, and faults.
Owner:SOUTHEAST UNIV
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