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30results about How to "High quality power supply" patented technology
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STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof
InactiveCN102222922APrevent fallingAvoid lossFlexible AC transmissionReactive power adjustment/elimination/compensationCapacitanceTime signal
The invention discloses a STATCOM (static synchronous compensator) control system adopting a droop control strategy and a control method thereof. The STATCOM control system adopting the droop control strategy comprises a direct-current side capacitor, a three-phase inverter bridge and an inductance-capacitance filter, wherein the direct-current side capacitor and the three-phase inverter bridge are connected in parallel and then connected with the inductance-capacitance filter, and the inductance-capacitance filter is connected to a PCC (Point of Common Coupling) of a power grid by a three-phase switch K through a coupling transformer T. The control method disclosed by the invention comprises the steps of real-time signal collection, computation of active power reference value P*, computation of reactive power reference value Q*, computation of frequency reference value omega* and voltage modulation amplitude reference value E*, computation of phase reference value Delta* and computation of voltage modulation signals; and only one PI (proportional integral) regulator and two droop control coefficients need to be regulated, thus the whole control method is easy to realize, and further the power system can better supply power to users safely, excellently and economically.
Owner:HUNAN UNIV +1
Portable insulation safety tool power-frequency voltage-withstand dolly
ActiveCN104880655ASave on fuel costsReduce labor costsTesting dielectric strengthTime of useRubber mat
The invention relates to a portable insulation safety tool power-frequency voltage-withstand dolly, comprising a dolly portion, a clamping portion, a conductive portion, a measuring portion, and a storage portion. The portable insulation safety tool power-frequency voltage-withstand dolly can satisfy power-frequency voltage-withstand test requirements of insulating gloves, insulating boots, an insulating rods, an electroscope, a grounding wire, an insulating septum, an insulating rubber mat, and other various safety tools. The dolly saves large amount of manpower and material resources, reduces occurrence of safety accidents, and has good economical benefits and social benefits. Because of application of the test dolly, the number of times of use of the dolly to carry tools is reduced, and the dolly brings about considerable environmental benefits.
Owner:江苏省电力公司太仓市供电公司
Two-AC and one-DC series-parallel microgrid structure suitable for multi-station integration
PendingCN110829508AGuaranteed uptimeSafe and stable operationAc network load balancingMicrogridControl engineering
The invention discloses a two-AC and one-DC series-parallel microgrid structure suitable for multi-station integration. The series-parallel microgrid structure is formed by series-parallel connectionof an alternating-current sub-microgrid 1, an alternating-current sub-microgrid 2 and a direct-current sub-microgrid, wherein the alternating-current sub-microgrid 1 is connected with the direct-current sub-microgrid through a power conversion device and a connecting point 1, and the alternating-current sub-microgrid 2 is connected with the direct-current sub-microgrid through a connecting point2; the connecting point 1 and the connecting point 2 are DC / AC conversion devices, the connecting point 2 is a standby power supply point of the connecting point 1, the energy of the connecting point2 can only flow in one direction, and the voltage is rapidly supported for the direct-current sub-microgrid only when the connecting point 1 fails; the alternating-current sub-microgrid 2 comprises aNo.2 energy storage and station transformer, a 400V / 380V isolation transformer, an energy storage battery and an AC / DC conversion device; the NO.2 energy storage and station transformer is connectedwith an external network, the 400V / 380V isolation transformer and the AC / DC conversion device, and the AC / DC conversion device is connected with the energy storage battery. The series-parallel microgrid structure is high in reliability, wide in coverage, high in fusion degree and excellent in economy.
Owner:CEEC HUNAN ELECTRIC POWER DESIGN INST
Non-intrusive electric appliance load identification method based on hidden Markov chain
ActiveCN110490760AUnderstanding of electricity consumptionReduce wasteData processing applicationsElectrical testingElectricityCurrent electric
The invention relates to a non-intrusive electric appliance load identification method based on a hidden Markov chain, and discloses a non-intrusive user load identification algorithm based on a hidden Markov model. The method comprises the steps of constructing the number of hidden states of the electric appliance load model, and counting the gear states of all electric appliances and the numberof the gear states of each electric appliance; constructing a model observation sequence value range, and calculating the maximum sum power of the electric appliance; determining a transition state matrix, and counting the transition probability between every two hidden states to form a transition matrix; counting the power consumption of the hidden state to obtain an emission matrix from the hidden state to the observation sequence; counting the occurrence probability of each hidden state in the power utilization process of the electric appliance to form an initial probability vector of eachhidden state; and obtaining the reading of the current electric meter as the current observation sequence, processing to obtain the optimal hidden state, and obtaining the current use condition of each electric appliance. The method is simple and effective, the electricity consumption condition of the user is obtained, too many sensors do not need to be deployed, high-frequency sampling is not needed either, early warning is conducted when the load is too high, and the electricity consumption risk is reduced.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER +1
Voltage dip disturbance source identification method based on voltage space vector
InactiveCN104931850AHigh quality power supplySmall amount of calculationFault locationSpecial data processing applicationsPower qualitySmart grid
The invention discloses a voltage dip disturbance source identification method based on a voltage space vector; the method comprises the following steps: converting three-phase voltage into one-dimension time variant complex variable; using DFT to form amplitudes, harmonic waves and phase angle characteristic quantity so as to detect and represent the voltage dip, and identify the disturbance source causing the dip; using three dimensional visualization description of the space vector to specifically represent the whole voltage dip. The method uses less variables in each phase analysis, is small in calculation, easy to realize in engineer, can deeply and systematically analyze and study the voltage dip problems, can further control and manage the voltage dip, thus ensuring qualified power supply for users, improving power quality, and promoting intelligent power grid development, so important reality meaning can be provided.
Owner:STATE GRID CORP OF CHINA +1
Power island
ActiveCN105071377AImprove reliabilityQuick supportPolyphase network asymmetry elimination/reductionAc network load balancingTransformerDC-BUS
The invention discloses a power island, comprising an SPC (Source Power Conditioner), an LPC (Load Power Conditioner), a DCS (DC Converter System), an emergency power supply system and an AC bus, wherein the SPC is formed by m sets of three single-phase conversion systems composed of 3m series transformers and 3m single-phase convertors; the LPC is formed by n sets of three single-phase conversion systems composed of 3n series transformers and 3n single-phase convertors; the DCS is formed by two sets of three-phase three-wire convertors spare for each other and a DC bus. According to the invention, m paths of power supply provide power for n paths of important loads through the power island; the power island can realize the seamless switching among a plurality of paths of power supply, rapid voltage support, seamless grid connection of an emergency power supply system, and maintenance of load normal work, and meanwhile realize voltage harmonic wave, current harmonic wave, and reactive power compensation; in addition, the power island can restrain impact load active fluctuation, realize peak load shifting, and eliminate the circulation caused by direct parallel connection of a plurality of paths of power supply or active loads; besides, the power island can isolate the fault current generated in case of load faults, and meet the requirements of high reliability and high quality for electric energy by important loads.
Owner:HUAZHONG UNIV OF SCI & TECH
STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof
InactiveCN102222922BPrevent fallingAvoid lossFlexible AC transmissionReactive power adjustment/elimination/compensationCapacitanceOmega
Owner:HUNAN UNIV +1
High-voltage circuit breaker closing control loop fault determination search method
InactiveCN108287305AReduce economic lossEasy to operateCircuit interrupters testingGreen-lightDevice failure
The present invention relates to a high-voltage circuit breaker closing control loop fault determination search method. The method comprises the steps of: determining the type of a closing control loop fault, and distinguishing the type of the closing control loop fault is an electrical loop fault or a mechanical loop fault. The method comprises the checking steps of: (1) checking whether a directcurrent power supply and a voltage are normal or not; (2) checking a skip monitoring HG green light is bright or not; (3) checking a universal change-over switch SA wiring loop; (4) checking internalfaults of a microprocessor protection device, if checking of (1)-(3) does not discover anomaly, determining that the internal faults of a microprocessor protection device are generated, requiring maintenance or replacement of a new operation board (I / O plug-in) so as to further perform checking and confirmation. The breaker closing control loop fault rapid determination, searching and operation method is simple to operate, solves the actual problem of a scene device, improves the fault searching efficiency, reduce the device fault outage time, reduce the energy consumption enterprise economiclosses and improves the power supply reliability.
Owner:SD STEEL RIZHAO CO LTD
Image forming apparatus using technique for controlling power supply
ActiveUS20150181066A1Reduce power consumptionSupplyTelevision system detailsEfficient power electronics conversionControl powerEngineering
An image forming apparatus that ensures high-quality power supply to an AFE (analog front-end) and reduces the amount of power consumed by the AFE in sleep mode. The AFE, which converts an analog signal into a digital signal, and another circuit different from the AFE are incorporated in an SOC (system-on-a-chip). A switch circuit switches power to the AFE between first DC power supply from a 5-V / 3.3-V_LDO and second DC power from a 24-V / 3.3-V_DC-DC converter. When the AFE is in use, the switch circuit is controlled such that the first DC power is supplied from the 5-V / 3.3-V_LDO to the AFE, and when the AFE is not in use, the switch circuit is controlled such that the second DC power is supplied from the 24-V / 3.3-V_DC-DC converter to the AFE.
Owner:CANON KK
Bundled conductor aeolian vibration determination method considering spacer damping parameter
ActiveCN105760561AHigh precisionGuaranteed safe operationSpecial data processing applicationsFinite element methodReduction factor
The invention relates to a bundled conductor aeolian vibration determination method considering a spacer damping parameter. The method is based on spacer line clamp damping parameter computational analysis and experimental study and combines a spacer average subspan calculation method, the real spacer damping is applied to a proper position of a bundled conductor, and finally, solution of bundled conductor aeolian vibration is realized with a finite element method, so that the bundled conductor aeolian vibration level is determined, and a reference is provided for anti-vibration design of lines. The method can make up defects of solving bundled conductor aeolian vibration on the basis of a traditional reduction factor method.
Owner:STATE GRID CORP OF CHINA +1
Electric vehicle charging pile load interactive control system and application method thereof
ActiveCN112389241AAvoid problems such as heavy overloadingImprove operating indicatorsCharging stationsVehicular energy storageTransformerControl system
The invention discloses an electric vehicle charging pile load interactive control system which comprises an interactive system main station, client interactive terminals and charging pile terminals,and is characterized in that the interactive system main station is in electric signal connection with the charging pile terminals and the client interactive terminals, and the charging pile terminalsare in electric signal connection with a transformer and switches; the transformer is in electric signal connection with the switches, the switches are in electric signal connection with the chargingpiles, and the number of the client turntable terminals and the number of the charging piles are both multiple. From the perspective of an intelligent power grid, the supply and demand relationship can be balanced, and the reliability of the system is improved; from the perspective of users, economic returns and benefits can be obtained by adjusting or changing the modes of using and purchasing electric power; from the perspective of the environment, energy conservation and emission reduction are facilitated, and increasingly serious energy crisis is relieved.
Owner:STATE GRID SHANDONG ELECTRIC POWER
Energy storage system
ActiveUS11277008B2Control power consumptionHigh quality power supplyCircuit monitoring/indicationPower network operation systems integrationConvertersControl power
The energy storage system according to one embodiment comprises a first converter connected between the system and the DC distribution network, and converting an AC voltage of the system into a DC voltage and transmitting the DC voltage to the DC distribution network; a second converter connected to the DC distribution network and controlling the voltage of the DC distribution network; a battery connected to the second converter and of which the charging and discharging are controlled by the second converter; a third converter connected to the DC distribution network; and a first load connected to the third converter and of which the voltage is controlled by means of the third converter, wherein the first converter generates a power control instruction for controlling at least one of the battery and the first load on the basis of SOC information of the battery and power consumption information of the first load.
Owner:LSIS CO LTD
System and method capable of instantly looking up line of customer
InactiveCN107229679AEasy to findHigh speedData processing applicationsSpecial data processing applicationsFuzzy queryTower
The invention discloses a system and method capable of instantly looking up a line of a customer. A screening module (2) of the system conducts information screening and judging on a customer name input by a query module (1) in a distribution automation system, if the same customer name exists, a precise query process is conducted, and if the same customer name does not exist, a fuzzy query process is conducted; a dialog box option module (3) outputs searched similar customer names to dialog box options to allow operating personnel to manually select, a database searching module (4) conducts searching in a line database and a customer database which are stored in the distribution automation system and pops up a customer line diagram page (5) after obtaining a result in searching, a customer effect module (6) enables the customer to perform two-flash emphasis, the number of a tower where the customer is located or the number of a ring main unit control switch of the customer is seen, and then a customer administration department and related information whether or not overload occurs are conveniently queried. The system is easy and convenient to use, easy and clear to operate, capable of saving manpower and expenses and significant in effect.
Owner:YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
Electric vehicle charging pile load interactive control system and application method thereof
ActiveCN113370825AAvoid problems such as heavy overloadingImprove operating indicatorsCharging stationsElectric vehicle charging technologyControl systemTransformer
The invention discloses an electric vehicle charging pile load interactive control system and an application method thereof, and belongs to the technical field of load interactive control, the electric vehicle charging pile load interactive control system comprises a transformer used for converting voltage of a transmission circuit into commercial power, and a first switch used for opening and closing a circuit. The application method of the electric vehicle charging pile load interactive control system comprises the steps that S1, a user fills in personal basic information, vehicle basic information and the like on the APP for registration, S2, the user can check the number of vehicles capable of being charged by a transformer at the same time and the number of vehicles being charged at present on the APP, the load rate of the transformer is mastered, the supply and demand relation can be balanced, and the reliability of the system is improved; from the perspective of user thinking, economic returns and benefits can be obtained by adjusting or changing the mode of using and purchasing the electric power; from the perspective of environment, energy conservation and emission reduction are facilitated, and increasingly serious energy crisis is relieved.
Owner:STATE GRID SHANDONG ELECTRIC POWER
Establishment of electric power engineering cost database system
The establishment of the power project cost database system includes analyzing and determining the key technical and economic indicators of power project investment control, and establishing a project cost data collection model; establishing a historical project cost experience database to provide reference data for reviewing project cost; intelligently selecting historical projects to realize historical Automatic comparison between projects and pending projects to improve review efficiency. The establishment of this database system is safe and reliable, with advanced technology, environmental protection, reasonable investment, unified standards, and efficient operation, and promotes the construction of power grids to better cooperate with social and economic development, avoiding the risk of investment waste becoming a bottleneck in economic development. On the other hand, under the premise of ensuring the safe and reliable operation of the power grid and the social demand for electricity, reasonably reduce the project investment cost, minimize the operating cost of the power grid enterprise, and realize the sustainable development of the company, thereby proposing safe, reliable and high-quality solutions for social development. , Low-cost electricity supply.
Owner:国网上海市电力公司经济技术研究院
Image forming apparatus using technique for controlling power supply
ActiveUS9160875B2Reduce power consumptionSupplyTelevision system detailsEfficient power electronics conversionControl powerAnalog signal
An image forming apparatus that ensures high-quality power supply to an AFE (analog front-end) and reduces the amount of power consumed by the AFE in sleep mode. The AFE, which converts an analog signal into a digital signal, and another circuit different from the AFE are incorporated in an SOC (system-on-a-chip). A switch circuit switches power to the AFE between first DC power supply from a 5-V / 3.3-V_LDO and second DC power from a 24-V / 3.3-V_DC-DC converter. When the AFE is in use, the switch circuit is controlled such that the first DC power is supplied from the 5-V / 3.3-V_LDO to the AFE, and when the AFE is not in use, the switch circuit is controlled such that the second DC power is supplied from the 24-V / 3.3-V_DC-DC converter to the AFE.
Owner:CANON KK
A control method for synchronous closing and grid-connection of microgrid group
ActiveCN106026195BThe voltage amplitudes are exactly the sameReduce shockSingle network parallel feeding arrangementsVoltage amplitudeTransformer
The invention provides a control method for synchronous closing and grid-connection of a microgrid group, which includes: respectively measuring the voltage amplitude, voltage frequency and voltage phase difference on the side of the distribution network and the side of the microgrid group with a voltage transformer; The voltage and frequency set the output voltage and frequency target value of the AC / DC conversion unit on the microgrid group side; the communication bus sends a broadcast message to the AC / DC conversion unit; after a predetermined time, the phase-locked loop follows the frequency and phase of the distribution network side output voltage frequency; the communication bus sends a broadcast message to the AC / DC conversion unit; and the synchronous closing controller of the microgrid group sends a closing command. The grid-connected frequency is controlled by the inverter based on the power electronic interface control provided by the present invention, so that the voltage amplitude, frequency and phase of the microgrid side and the distribution network side are exactly the same, the adjustment accuracy is high, and the impact of closing surge current is reduced .
Owner:CHINA ELECTRIC POWER RES INST +2
Intelligent active filter system
ActiveCN114676538AHigh quality power supplyImprove cooling effectGeometric CADActive power filteringSoftware updateControl cell
The intelligent active filter system comprises an active filter body, an industrial personal computer, a switching unit, a fault detection unit, a software updating unit, a prompt unit, a power supply quality detection unit, a networking control unit, a data transmission unit, a data receiving and control unit, a communication identification access unit and a communication simulation unit, the fault monitoring unit is further provided with a voiceprint and noise data acquisition subunit, a voiceprint and noise recognition subunit and a database subunit. The equipment is small in overall occupied space and more compact, the cost is reduced, communication networking between the equipment can be automatically achieved after installation and maintenance, communication analogue simulation operation can be achieved, the equipment can be automatically switched to another set of equipment when a fault occurs, related managers can be indicated to maintain the equipment when the corresponding parts go wrong, and the maintenance efficiency is improved. Software can be repaired and updated again, networking of active filters in different installation areas can be achieved, and managers can detect working data and performance and can remotely control opening and closing and adjust output power.
Owner:昂顿科技(上海)有限公司
A Method for Determining Breeze Vibration of Split Conductors Considering Damping Parameters of Spacers
ActiveCN105760561BHigh precisionGuaranteed safe operationSpecial data processing applicationsFinite element methodReduction factor
The invention relates to a bundled conductor aeolian vibration determination method considering a spacer damping parameter. The method is based on spacer line clamp damping parameter computational analysis and experimental study and combines a spacer average subspan calculation method, the real spacer damping is applied to a proper position of a bundled conductor, and finally, solution of bundled conductor aeolian vibration is realized with a finite element method, so that the bundled conductor aeolian vibration level is determined, and a reference is provided for anti-vibration design of lines. The method can make up defects of solving bundled conductor aeolian vibration on the basis of a traditional reduction factor method.
Owner:STATE GRID CORP OF CHINA +1
Building fire scene monitoring system based on unmanned aerial vehicle and implementation method thereof
PendingCN113959379AReliable monitoring meansImprove the accuracy of situation synchronizationThermometer applicationsUsing wave/particle radiation meansData bankMonitoring system
The invention discloses a building fire scene monitoring system based on an unmanned aerial vehicle and an implementation method thereof, and the system comprises the unmanned aerial vehicle, a holder structure disposed on the unmanned aerial vehicle, a high-altitude displacement telemetering device connected to the holder structure, and a corresponding signal conversion circuit and a voltage stabilizing circuit, a displacement beacon arranged outside the building, a temperature sensor, a displacement sensor and a low-delay communication device which are arranged inside the building, and a monitoring and early warning terminal for receiving and processing signals. A 3D digital model is established for the high-risk fire building, and a building fire collapse database is established through simulation analysis; the displacement value of each monitored part is compared with a displacement threshold value in a database, and early warning processing is carried out. According to the invention, a mode of combined monitoring inside and outside the building is adopted, the unmanned aerial vehicle is adopted to carry the high-altitude displacement telemetering device above the building for monitoring, and monitoring information is transmitted in a low-delay manner, so that effective monitoring of a building fire scene is realized.
Owner:应急管理部四川消防研究所
A self-adaptive recovery device and recovery method for braking energy of multiple train units
ActiveCN114475264BAchieve transferHigh quality power supplyBatteries circuit arrangementsElectrodynamic brake systemsData acquisitionTraction power supply
Owner:CHINA RAILWAY DESIGN GRP CO LTD +2
Braking energy self-adaptive recovery device and recovery method for motor train unit
ActiveCN114475264AAchieve transferHigh quality power supplyBatteries circuit arrangementsElectrodynamic brake systemsData acquisitionControl theory
The invention discloses a motor train unit braking energy self-adaptive recovery device and recovery method, and belongs to the technical field of dynamic electric energy recovery type braking. The data acquisition unit is used for acquiring current data on each power supply arm; the energy storage device is used for realizing storage or release of braking energy and enabling electric energy to be subjected to bidirectional conduction between the two sets of converter devices; the control part is used for receiving the data of the data collector, analyzing and processing the data and further controlling the converter device and the energy storage device to act; the converter device performs voltage transformation and conversion on the traction power supply to obtain a 10kV power supply used by a railway through power supply or a self-closing power supply; and the direct current buses of the two sets of converter devices are connected through the energy storage device. Braking energy is flexibly transferred between the two traction arms, the residual braking energy is temporarily stored in the energy storage device, and after braking of the electric motor train unit is finished, the energy in the energy storage device is gradually released to a railway through or self-closing load through the converter device.
Owner:CHINA RAILWAY DESIGN GRP CO LTD +2
a power island
ActiveCN105071377BImprove reliabilityQuick supportPolyphase network asymmetry elimination/reductionAc network load balancingTransformerEngineering
The invention discloses a power island, comprising an SPC (Source Power Conditioner), an LPC (Load Power Conditioner), a DCS (DC Converter System), an emergency power supply system and an AC bus, wherein the SPC is formed by m sets of three single-phase conversion systems composed of 3m series transformers and 3m single-phase convertors; the LPC is formed by n sets of three single-phase conversion systems composed of 3n series transformers and 3n single-phase convertors; the DCS is formed by two sets of three-phase three-wire convertors spare for each other and a DC bus. According to the invention, m paths of power supply provide power for n paths of important loads through the power island; the power island can realize the seamless switching among a plurality of paths of power supply, rapid voltage support, seamless grid connection of an emergency power supply system, and maintenance of load normal work, and meanwhile realize voltage harmonic wave, current harmonic wave, and reactive power compensation; in addition, the power island can restrain impact load active fluctuation, realize peak load shifting, and eliminate the circulation caused by direct parallel connection of a plurality of paths of power supply or active loads; besides, the power island can isolate the fault current generated in case of load faults, and meet the requirements of high reliability and high quality for electric energy by important loads.
Owner:HUAZHONG UNIV OF SCI & TECH
A Method for Optimal Selection of Split Spacing in Multi-split Conductors
ActiveCN106329384BImprove economyEasy to operateApparatus for overhead lines/cablesEngineeringElectromagnetic environment
The invention relates to a split spacing optimization and selection method for a multi-split wire. The split spacing optimization and selection method comprises the following steps of (1) analyzing an electromagnetic environment according to a voltage level to obtain a wire split spacing selection range which satisfies requirement of an electrical environment; (2) determining several kinds of wire split spacing values within the wire split spacing selection range; (3) analyzing a relation between a subspan oscillation amplitude value and a maximum subspan of the split wire under the wire split spacing valuing condition; (4) optimizing the split spacing values; (5) performing verification on the split spacing values based on a fitting design condition and economical efficiency; and (6) performing iteration on the steps of (3)-(5) repeatedly to determine an optimized split spacing value. By adoption of the technical scheme of the split spacing optimization and selection method, the reasonable wire split spacing can be chosen specific to a circuit condition so as to directly support circuit design and construction.
Owner:CHINA ELECTRIC POWER RES INST +2
A portable insulation safety tool power frequency withstand voltage test trolley
ActiveCN104880655BHigh quality power supplyHigh-quality power supply serviceTesting dielectric strengthSocial benefitsElectroscope
The invention relates to a portable insulation safety tool power frequency withstand voltage test trolley, which comprises: a car body part; a clamping part; a conductive part; a measuring part and a storage part. The portable insulating safety tool power frequency withstand voltage test trolley of the present invention can meet the power frequency withstand voltage test of various safety tools such as insulating gloves, insulating boots, insulating rods, electroscopes, grounding wires, insulating partitions, insulating rubber pads, etc. Require. It saves a lot of manpower and material resources, reduces the occurrence of safety accidents, and has good economic and social benefits. And because the application of the test trolley of the present invention reduces the number of vehicles used by the porters, it can also bring considerable environmental benefits.
Owner:江苏省电力公司太仓市供电公司
An emergency adjustment system for three-phase electric unbalance
ActiveCN111224413BReduce imbalanceImprovement of voltage imbalancePolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionControl engineeringPower grid
The invention discloses an emergency adjustment system for three-phase electric unbalance, which comprises a grid input unit, a DC battery unit, an AC output unit, a control unit, and a signal acquisition unit; the grid input unit includes an input contactor, an AC fuse, a direct supply Contactors, load contactors; DC battery units include single-phase controllable rectifiers, filter reactors, filter capacitors, isolation diodes, DC switches, DC fuses, battery packs; AC output units include three-phase full-bridge inverters , filter reactor, and output contactor; the signal acquisition unit is respectively connected to the voltage monitoring terminal of the grid input circuit, the voltage and current monitoring terminal of the battery pack, and the voltage and current monitoring terminal of the three-phase full-bridge inverter; the control unit passes the signal The signal analysis of the acquisition unit controls the closing and opening of the corresponding contactors and switches, and outputs signals to the single-phase controllable rectifier and the three-phase full-bridge inverter for control.
Owner:STATE GRID CORP OF CHINA +2
Real-time monitoring system for information of unattended substation
InactiveCN105375624AImprove the ability to optimize the allocation of resourcesImprove operational efficiencyCircuit arrangementsElectricitySite monitoring
The invention discloses a real-time monitoring system for the information of an unattended substation, and the system comprises an on-site collection device, a monitoring branch unit, an electricity obtaining module, a monitoring center host, and a communication module. The electricity obtaining module supplies power to an on-site monitoring module and a line monitoring branch unit. The on-site collection device is an electronic eye which can move and can enable a camera to rotate up and down and left and right. The system is small in size, is easy to install, is complete and accurate in data collection, and can collect data in real time. The system completely improves the resource optimization configuration capability of a power grid, improves the operation efficiency of a power system, guarantees the safe, excellent and reliable supply of power, and has great significance.
Owner:STATE GRID CORP OF CHINA +2
Electrification oil sample acquisition device for oil-immersed sleeve pipe of transformer
ActiveCN101598639BReduce agingImprove sealingTransformers/inductances coolingWithdrawing sample devicesFour-way valveTransformer
Owner:乐山电业局修理试验所 +1
Emergency regulation system for three-phase power imbalance
ActiveCN111224413AReduce imbalanceImprovement of voltage imbalancePolyphase network asymmetry elimination/reductionPolyphase network asymmetry reductionControl cellControl theory
The invention discloses an emergency regulation system for three-phase power imbalance. The emergency regulation system comprises a power grid input unit, a direct-current battery unit, an alternating-current output unit, a control unit and a signal acquisition unit, wherein the power grid input unit comprises an input contactor, an alternating-current fuse, a direct supply contactor and a load contactor; the electric direct-current battery unit comprises a single-phase controllable rectifier, a filter reactor, a filter capacitor, an isolation diode, a direct-current switch, a direct-current fuse and a battery pack; the alternating-current output unit comprises a three-phase full-bridge inverter, a filter reactor and an output contactor; the signal acquisition unit is connected with the voltage monitoring end of the power grid input circuit, the voltage and current monitoring end of the battery pack and the voltage and current monitoring end of the three-phase full-bridge inverter; andthe control unit is used for controlling the closing and opening of the corresponding contactors and switches by analyzing signals of the signal acquisition unit and outputting signals to the single-phase controllable rectifier and the three-phase full-bridge inverter so as to carry out control.
Owner:STATE GRID CORP OF CHINA +2
An improved three-phase four-leg topology for active power decoupling
ActiveCN110061511BHigh quality power supplyReduce the total capacitanceAc-dc conversionPolyphase network asymmetry elimination/reductionCapacitanceActive power decoupling
The invention belongs to the technical field of power electronics, and specifically relates to an improved three-phase four-bridge arm topology for realizing active power decoupling used in a system containing a single / three-phase unbalanced load or source. The improved three-phase four-bridge arm topology comprises eight switch tubes S1, S2, S3, S4, S5, S6, S7, S8, four inductors La, Lb, Lc and Ln and five capacitors Ca, Cb, Cc, Cn, Cdc. When the single / three-phase unbalanced load or source exists, a fourth bridge arm is controlled, a passage is provided for a zero-sequence component by usinga center line, and then three-phase phase voltage balance is realized, and high-quality power supply is provided for the load; secondary impulse power on an alternating current side is provided by the capacitors on the alternating current side through active power decoupling control, a direct current side just needs to provide the average power component on the alternating current side, on the basis of without adding switch devices, a secondary impulse power decoupling purpose is realized, the tolerance of supporting capacitors on the direct current side can be reduced effectively, and the influence of secondary impulse power on direct current source or front system control performance is avoided.
Owner:普世通(北京)电气有限公司
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