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49results about How to "Oscillation amplitude is small" patented technology
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Parameter configuration method for multi-machine parallel dynamic consistent response of microgrid virtual synchronous machine
ActiveCN108923460ASmooth transitionOscillation amplitude is smallEnergy industrySingle network parallel feeding arrangementsVirtual synchronous generatorDamping factor
With regard to the problem of frequency response and power allocation unreasonableness during the transient process caused by parameter design unreasonableness of a parallel running virtual synchronous power generator in a micro power grid, the invention proposes an inertia damping matching mechanism of a multi-machine parallel virtual synchronous power generator (VSG). The power allocation is controlled, and meanwhile, stable transient transition (relatively low oscillation amplitude and period) of power generators running in parallel and having different capacities is ensured. A PI regulator-based improved damping control method is creatively proposed. All VSGs can work with the same damping coefficient value under a modification method, so that calculation is reduced. In VSG parallel running, the selection of inertia and damping coefficient shall consider the dynamic characteristics of a system frequency and parallel power of the VSG, and the parameters are capacity functions of theVSG; and according to a matching principle, the steady-state and transient process can be optimized, so that stable support can be provided for a large amount of distributed power supplies connectedto the micro power grid and an intelligent power grid.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Photovoltaic array maximum power point tracking (MPPT) controller based on segmented model and controlling method
ActiveCN102902298AImprove control efficiencyOscillation amplitude is smallPhotovoltaic energy generationLight radiation electric generatorOptimal controlEngineering
The invention provides a photovoltaic array maximum power point tracking (MPPT) controller based on a segmented model. The photovoltaic array MPPT controller is connected with a photovoltaic power generation system, so that the photovoltaic power generation system works in a maximum power output state; the photovoltaic power generation system comprises a photovoltaic array, a voltage and current measurement circuit and a direct current / direct current (DC / DC) conversion circuit; the photovoltaic array MPPT controller comprises a digital signal processor / micro control unit (DSP / MCU) controller and a control module based on the segmented model, wherein the DSP / MCU controller is connected with the voltage and current measurement circuit and the DC / DC conversion circuit; and the control module based on the segmented model runs on the DSP / MCU controller. In addition, the invention also provides a photovoltaic array MPPT controlling method based on the MPPT controller and the segmented model. Through the controller and the method, the working point of the photovoltaic array is accurately converged at a global maximum value, so that optimal control is realized.
Owner:昇辉智能科技股份有限公司
Signal injection-based PMSM stator winding temperature online detection method
InactiveCN108847799AMonitor healthImprove performanceElectronic commutation motor controlAC motor controlElectricityElectrical resistance and conductance
The invention belongs to the technical field of computer systems, and discloses a signal injection-based PMSM stator winding temperature online detection method. The method comprises the steps of establishing a high-performance PMSM stator temperature online calculation method, and adding an optimal signal injection strategy into the online calculation method; adding vector control on the basis ofan existing signal injection method to form a new signal injection method; performing direct current component extraction in the new signal injection method; and calculating the stator resistance andthe estimated temperature and obtaining the real-time temperature observed data. The temperature of the stator winding of a permanent magnet synchronous motor is estimated online, so that the healthcondition of the motor can be monitored, and over-temperature generation can be prevented, and the methods can also be used in motor optimization control such as active heat management and the like, and is beneficial to improving the performance of an electric driving system.
Owner:HUNAN MECHANICAL & ELECTRICAL POLYTECHNIC
Method and system for suppressing subsynchronous oscillation of thermal power unit
ActiveCN109830969ASuppression of subsynchronous oscillationsSubsynchronous oscillations are weakened or suppressedFlexible AC transmissionReactive power adjustment/elimination/compensationOperation modeControl theory
The invention discloses a method and system for suppressing the subsynchronous oscillation of a thermal power unit. The method comprises a step of establishing a suppression controller including a static var generator (SVC) and an supplementary excitation damping controller (SEDC). The two controllers have a sum relationship in the aspect of subsynchronous oscillation suppression. The SVC has a good suppression capability, and the SEDC has low investment. On the one hand, the combination of the two controllers can reduce the capacity of the SVC and reduce the investment. On the other hand, theSEDC can be used when the SVC is overhauled. The method and system can decrease, when the subsynchronous oscillation occurs, the oscillation amplitude and delay the generator tripping protection actuation time, so that workers can take more time to adjust the operation mode of the system to eliminate the subsynchronous oscillation of the unit.
Owner:STATE GRID QINGHAI ELECTRIC POWER +3
Electric power system stabilizer parameter optimization method based on generalized phase compensation method
PendingCN110957746AImprove robustnessGood damping propertiesSingle network parallel feeding arrangementsPower oscillations reduction/preventionTime domainControl engineering
The invention provides an electric power system stabilizer parameter optimization method based on a generalized phase compensation method, and the method comprises the steps: firstly, constructing a DFIG model of a double-fed wind generating set; secondly, adding the DFIG model into a power system, adding a power system stabilizer into the power system according to low-frequency oscillation existing in the power system, and optimizing parameters of the power system stabilizer by using a generalized phase compensation method; and finally, through adoption of a characteristic root analysis method and a time domain simulation method, analyzing the influence of the power system stabilizer after parameter optimization on the damping characteristic of the power system. According to the method, the PSS is optimized through adoption of the generalized phase compensation method, so that the damping characteristic of the power system after wind power grid connection can be better improved, the oscillation amplitude of the power system is reduced, the oscillation time is shortened, and the stability of the power system is facilitated; and for different operation conditions, the optimized PSShas better robustness.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Time-shared stabilized control method of hall electric propulsion discharging current
ActiveCN105511308AStable controlOscillation amplitude is smallProgramme control in sequence/logic controllersWork performanceAnode
The invention relates to a time-shared stabilized control method of a hall electric propulsion discharging current. On the basis of a time-shared control strategy, a relatively stable anode throttler temperature is used as a closed-loop feedback parameter at an initial ignition stage, so that failed ignition caused by using a high-oscillation discharging current as a feedback parameter directly can be avoided. After successful ignition, the discharging current oscillation amplitude is reduced; and then the discharging current is used as the closed-loop feedback parameter directly, thereby realizing stable control of the discharging current of the hall electric propulsion system, suppressing the low-frequency oscillator of the discharging current, and improving the efficiency. According to the time-shared control strategy, ignition reliability of the hall electric propulsion system at the initial ignition stage is guaranteed and the working performance of the hall electric propulsion system during the operating process is also improved.
Owner:BEIJING INST OF CONTROL ENG
Wavelet neural network weight initialization method based on Bayes estimation
InactiveCN103761567AStrengthen learning and training abilityOscillation amplitude is smallBiological neural network modelsNerve networkNetwork output
The invention relates to the technical field of optimization of the wavelet neural network, in particular to a wavelet neural network weight initialization method based on Bayes estimation, and the state estimation and search idea is adopted in the wavelet neural network weight initialization method. The wavelet neural network weight initialization method based on Bayes estimation comprises the steps of building a wavelet neural network model, unitizing weights, inputting and optimizing wavelet nerve cell weights, and optimizing weights of nerve cells of an output layer. Wavelet neural network weight parameters are linked with the network structure, wavelet types, input data and output target values, the state estimation idea and theory are introduced into initial setting of the weight parameters, wavelet network learning and training capacity is enhanced, the wavelet network has certain pertinence in the initialization phase, and therefore the adaptability of the weights in follow-up network learning and training is improved. Compared with a traditional weight initialization method, the learning efficiency can be effectively improved, oscillation amplitude of network output can be reduced, the rate of algorithm convergence is improved, and network output divergence caused by improper weights can be avoided.
Owner:HARBIN ENG UNIV
Method for realizing nuclear reactor load tracking
ActiveCN107945889AReduce waste water treatment costsOscillation amplitude is smallNuclear energy generationNuclear reaction controlPower controlNuclear reactor
The invention discloses a method for realizing nuclear reactor load tracking. The method uses two groups of relatively-independent control rods for reactive and axial power shift power control of a nuclear reactor; the two groups of relatively-independent control rods are a T rod group and a K rod group respectively, wherein the K rod group consists of a plurality of beams of black rods; the T rodgroup comprises a plurality of beams of grey rods and black rods; during the base load operation of the nuclear reactor, only the K rod group is inserted into a reactor core, and the insertion depthof K rod group is greater than or equal to the bite amount plus 24 steps; during the load tracking operation of the nuclear reactor, both the T rod group and the K rod group are inserted in the reactor core. The method disclosed by the invention has the benefits that only one group of control rods is required to be inserted into the reactor core during the base load operation, and the defects thatthe fuel consumption is non-uniform, the control rod fluence is increased, the control rod absorption body fuel consumption is more, the control rod drive mechanism load is increased, and the like due to the insertion of the more control rods into the reactor core during the base load operation are overcome.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Method for self-adaptively adjusting learning rate by tracking and controlling neural network
The invention provides a method for self-adaptively adjusting the learning rate by tracking and controlling a neural network. The method comprises the following steps of building a control system; unitizing all weights of the neural network according to layers; introducing a training sample set to obtain an error signal e(n) and a training cost function epsilon(n); obtaining a linearized activation function s(x); determining an induction local region and nerve cell output of each nerve cell; solving each local gradient function delta j(n) and each linearization expression delta jL(n); adjusting the learning rate selectively and self-adaptively; training the weight of a synapse of each nerve cell; adding one to the number of cycles until stopping criterions are met, and outputting tracking and controlling signals. According to the method for self-adaptively adjusting the learning rate on the basis of the activation function and the multiple error signals, a step length iteration mean value is not affected by noise, a smooth iteration curve is obtained, and the error signals are fully used; thus, the learning rate can be updated in real time, and computation complexity is reduced.
Owner:HARBIN ENG UNIV
Transconductance linear broadband LC type voltage-controlled oscillator and adjustable capacitor array circuit
ActiveCN108199687AOscillation amplitude is smallShorten the timeOscillations generatorsCapacitanceCoupling
The invention discloses a transconductance linear broadband LC type voltage-controlled oscillator and an adjustable capacitor array circuit. The transconductance linear broadband LC type voltage-controlled oscillator comprises an LC oscillation circuit and a first adjustable capacitor array circuit; the LC oscillation circuit is characterized by comprising a first PMOS transistor, a second PMOS transistor, a first three-end differential inductor and a biasing circuit; the grid electrode of the first PMOS transistor is connected with the drain electrode of the second PMOS transistor through a first AC coupling capacitor; the grid electrode of the second PMOS transistor is connected with the drain electrode of the first PMOS transistor through a second AC coupling capacitor; the two symmetrical ends of the first three-end differential inductor are separately connected with the grid electrode of the first PMOS transistor and the grid electrode of the second PMOS transistor; the center tapend of the first three-end differential inductor is connected with the biasing circuit; and the first adjustable capacitor array circuit is connected in parallel with the two symmetrical ends of thefirst three-end differential inductor. The transconductance linear broadband LC type voltage-controlled oscillator and the adjustable capacitor array circuit can be widely applied to various high-frequency local oscillation phase-locked loop systems.
Owner:CHONGQING SOUTHWEST INTEGRATED CIRCUIT DESIGN +1
Inertial navigation error modulation method based on body diagonal rotation
PendingCN113465631AReduce mistakesOscillation amplitude is smallMeasurement devicesRotational axisGyroscope
The invention discloses an inertial navigation error modulation method based on body diagonal rotation. The method comprises the following steps: determining a mounting coordinate system, a carrier coordinate system, a rotating coordinate system and a rotating shaft, defining a constant error, a scale coefficient error, a mounting error, a rotating angular speed, stop position times and a rotating angular speed of a gyroscope and an accelerometer; sequentially determining the rotating shaft, a rotating direction, a rotating angle and stop time under a complete period rotating order; and determining the attitude error in one rotation period, the speed error in one rotation period and the longitude and latitude error in long endurance. Through a method of separating a mounting coordinate system from a carrier coordinate system, based on body diagonal rotation, the limitation of a traditional rotation scheme is broken through, and three axial errors can be eliminated, so that the error of the inertial navigation system is reduced to be smaller, and the attitude error and the speed accumulation error of the system in one rotation period are effectively reduced. Therefore, the oscillation amplitude of the latitude error and the longitude error related to the method is obviously reduced.
Owner:NAVAL UNIV OF ENG PLA
Alternating current channel transmission capacity optimization method and device in alternating current/direct current hybrid power system
ActiveCN107732899AImprove transmission capacityReduce outputAc network circuit arrangementsHysteresisPower grid
The invention provides an alternating current channel transmission capacity optimization method and device in an alternating current / direct current hybrid power system. The method comprises the stepsthat double-machine equivalence is carried out on a transmission-side alternating current system according to the dynamic response curve of an alternating current / direct current hybrid power grid, soas to acquire a leading generator group and a hysteresis generator group; Thevenin equivalence is carried out on the alternating current / direct current hybrid power grid from the direct current side according to the leading generator group and the hysteresis generator group; and finally the operation mode of the alternating current / direct current hybrid power grid is adjusted according to the Thevenin equivalence result of the alternating current / direct current hybrid power grid; and the alternating current channel transmission capacity is optimized in the direct current hybrid power grid. According to the invention, the problem that an alternating current channel is impacted by the collapse of the transmission power of a direct current transmission system during a recovery process and thevoltage drop of a direct current conversion bus after the generator group oscillating aroused by certain faults in the transmission-side alternating current system is solved; and reference is provided for a power grid operator to arrange the operation mode of the alternating current / direct current hybrid power grid reasonably to ensure safe and stable operation of the alternating current / direct current hybrid power grid.
Owner:CHINA ELECTRIC POWER RES INST +2
Maglev train, levitation control system and method for improving operation stability
The invention discloses a maglev train, a levitation control system and a method for improving operation stability, and relates to the field of levitation control. In order to avoid the influence of track irregularity interference on the levitation control stability of the maglev train, after an irregularity interference estimated value is obtained, feed-forward control is used for applying dynamic compensation to the track irregularity, so that the adverse influence of the irregularity interference on the levitation control stability can be greatly weakened, the maintenance period of the track is prolonged, the operation cost is reduced, and the operation stability and comfort of the maglev train are further improved. By adding feedforward control, the anti-interference capability of the levitation control system of the maglev train is improved, the robustness and environmental adaptability of the levitation control system are improved, and the used feedforward control and feedback control policy can also be migrated and used for other similar scenes.
Owner:ZHUZHOU ELECTRIC LOCOMOTIVE CO
Control parameter optimization design method for multi-terminal flexible direct-current power transmission system
ActiveCN111478356AFast dynamic responseSmall voltage fluctuationElectric power transfer ac networkForecastingSmall-signal modelControl system
The invention discloses a multi-terminal flexible direct-current power transmission control parameter optimization design method. The method comprises the steps of building a small signal model of a flexible direct-current power transmission system, wherein the small signal model comprises a main system model and a control system model; and establishing an optimal control parameter design problemtaking the characteristic value as a target function, and solving the optimal control parameter design problem taking the characteristic value as the target function by adopting an optimization algorithm based on sensitivity analysis to obtain an optimal control parameter. According to the method, the step length of each iteration can be determined through backtracking line search, iterative oscillation is prevented, and the convergence speed is increased; since the search direction and the step length are determined according to the sensitivity of the control parameters, the result of each iteration can monotonously approach the optimal solution in the optimization process, thereby improving the stability of the system.
Owner:XI AN JIAOTONG UNIV
Novel method for adjusting time difference reaction
InactiveCN101899494AInhibitory activityEasy to adjustMicrobiological testing/measurementVector-based foreign material introductionHuman bodyMammal
The invention discloses a novel method for adjusting the time difference reaction of the mammal, relating to a novel protein Magedl for adjusting the circadian rhythm and the mammal, wherein the novel protein Magedl plays an important part in maintaining the normal biological clock function. In a mouse with the Magedl, the core biological clock molecular amplitude of the mouse is changed to be small, the day-night cycle of the mouse is changed to be short, and the adjusting speed in the simulative time difference reaction is accelerated. Therefore, the Magedl can be taken as a drug target for curing the time difference reaction of human body.
Owner:NANJING UNIV
Trunk core muscle group balance control capability evaluation system
ActiveCN110448274AAvoid test errorImprove securityDiagnostic recording/measuringSensorsMuscle groupComputer module
The invention relates to the technical field of sports equipment, and particularly relates to a trunk core muscle group balance control capability evaluation system. The system comprises a sitting support, a strength traction assembly and a three-dimensional trunk dynamic analysis module. Wherein the sitting support is used for fixing the body trunk of a subject; the strength traction assembly isused for applying detection stress to the body trunk of the subject to generate oscillation data of the body trunk; the three-dimensional trunk dynamic analysis module is used for acquiring the oscillation data of the body trunk, analyzing the index parameters of the trunk core muscle group balance control capability of the subject according to the oscillation data and the disturbance data, and carrying out system evaluation according to the index parameters. According to the method, the problems that only single presentation of the current evaluation methods can be realized, and accurate quantification and system evaluation cannot be realized in an existing evaluation method are solved.
Owner:THE FIRST AFFILIATED HOSPITAL OF ARMY MEDICAL UNIV
Holder for attaching an assembly
InactiveUS20120160986A1Improved oscillatory behavior and strength behaviorClamping jointSpringsSprings/dampers functional characteristicsMechanical engineeringPhysics
The invention relates to a mounting element for attaching an assembly, in particular a pump 10, to a mount 12. The mounting element 1 comprises a bracket 11 and a damping element 13. The damping element 13 comprises a first recess 131 for receiving the assembly. The damping element further comprises a contact surface 130 for contacting the bracket 11. The bracket secures the damping element 13 in the mount 12. Adjacent to the first recess 131, the damping element 13 comprises a second recess 132 which supports a radially symmetric deformation of the cross section of the first recess 131 when the bracket 11 is secured to the mount 12.
Owner:ROBERT BOSCH GMBH
Drug dosing recommendation
PendingCN109478420AReduce the number of testsReduce storageMedical simulationMedical data miningDrug dosingMedicine
The present invention relates to a method for calculating or estimating at least one medical value based on several input values using artificial intelligence.
Owner:FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
Spiral plate heat exchanger with protection function for sludge and working method thereof
InactiveCN108871018AOscillation amplitude is smallAvoid cloggingSludge treatment by de-watering/drying/thickeningCorrosion preventionThermal energyPlate heat exchanger
The invention discloses a spiral plate heat exchanger with a protection function for sludge and a working method thereof. The spiral plate heat exchanger comprises a feeding device, a heat exchanger and a control device, wherein a stirring device is arranged in the feeding device; the input end of the feeding device is connected with a sludge heat processor through a pipeline; the outlet end of the feeding device is connected with the heat exchanger, a fixing frame is arranged below the heat exchanger, a damping mechanism is arranged on the fixing frame, and the output end of the heat exchanger is connected with a heat recovery mechanism through a pipeline; the heat exchanger uses a spiral plate exchange structure, two flow paths are arranged in the structure, the two paths are respectively a first flow path and a second flow path, and the feeding device, the heat exchanger and the stirring device are all connected with the control device. According to the invention, the stirring device in arranged in the feeding device to stir the sludge to prevent the sediments in the sludge from causing clogging of the flow paths, and the exchanged heat energy is transmitted to the heat recoverymechanism to supply heat to the equipment requiring heat energy, and the arrangement of the shock absorbing mechanism can effectively reduce the oscillation amplitude of the heat exchanger.
Owner:SUZHOU SHUIMUKANGQIAO ENVIRONMENTAL ENG TECH CO LTD
Method for monitoring height of return capsule of manned spacecraft by fusing GPS (Global Positioning System) and barometric altitude
PendingCN114459431AOscillation amplitude is smallHigh precisionInstruments for comonautical navigationHeight/levelling measurementDrogue parachuteClassical mechanics
The invention belongs to the technical field of manned spacecraft recovery landing height monitoring methods, and particularly relates to a method for monitoring the height of a manned spacecraft reentry capsule by fusing a GPS (global positioning system) and an air pressure height. The atmospheric pressure change returning to the outside of the capsule is sensed through a pressure sensor and converted into height, and the height and the height and speed information obtained by a GPS receiver serve as observation variables; data fusion processing is carried out on observation variables through extended Kalman filtering, the fused height h is obtained, the accuracy and reliability of height information are remarkably improved, the height and the attitude of a return capsule are comprehensively considered in brake parachute opening and separation control, and the reliability of the brake parachute is improved. The oscillation amplitude of the reentry capsule during the period from the opening of the brake parachute to the opening of the main parachute and the occurrence probability of the situation unfavorable for the opening of the main parachute are reduced, so that the overall control reliability is improved.
Owner:南通智能感知研究院
Seedling identification system and method of soil-hardening salination soil seed bank
InactiveCN108828998AIssues Affecting IdentificationFailure to Germinate Problems AvoidedProgramme controlComputer controlTemperature controlTime control
The invention discloses a seedling identification system and method of a soil-hardening salination soil seed bank, and belongs to the technical field of identification of the soil seed bank. The identification system comprises a time control module, a temperature control module, a central control module, an immersion module, a rinsing module, a seedling culturing module and a species quantity identification module. The problem that severe soil hardening influences germination of seedlings in the prior art is solved via the immersion module, the rinsing module and the seedling culturing module,and a more accurate identification method is provided for research on the soil-hardening salination soil seed bank; the species quantity identification module plants screened seeds in the appropriatesoil environment directly; and the types and quantity of species separated by the method are both exceed those of a traditional manual sorting method respectively, and it is shown that the precisionand efficiency are both higher than those of the traditional method respectively.
Owner:INST OF SOIL FERTILIZER & WATER SAVING AGRI GANSU ACAD OF AGRI SCI
Extracting mortar for molecular biology test and extracting method thereof
InactiveCN108822186AGood Adaptive Processing CapabilityLittle impact on performanceCharacter and pattern recognitionPeptide preparation methodsPlastic materialsData information
The invention belongs to the field of biological tests, and discloses an extracting mortar for a molecular biology test and an extracting method thereof. Through a power supply module, power is supplied to a device in a protein system extracting technology; through a temperature detecting module and a humidity detecting module, environment temperature and humidity data in the protein system extracting technology is detected and controlled; through a camera module, protein system extracting process image data is collected; and through a display module, detected data information and monitored image content are displayed. The provided extracting mortar is time-saving and labor-saving in use, wherein a mortar rod is made of a rigid plastic material, and can be replaced at any time. A frictionforce to a reagent can be improved through bulges on a mortar ball, so that grinding is more complete. A top cover is fixed on a mortar body through a buckle, the reagent is prevented from being exposed, and pollution of an external environment to the interior is also avoided, so the safety of the extracting mortar is enhanced.
Owner:GUANGDONG UNIV OF PETROCHEMICAL TECH
System and method for controlling equipment parameters in streptonigrin compound extraction process
InactiveCN109460092AComprehensive cleaningQuality improvementSimultaneous control of multiple variablesControl systemComputer module
The invention belongs to the technical field of medicine preparation and discloses a system and method for controlling equipment parameters in a streptonigrin compound extraction process. The controlsystem comprises a power supply module, a temperature detection module, a humidity detection module, a camera module, a main control module, a cleaning module, a cloning module, a deactivation module,a fermentation module and a display module. The control method is also disclosed at the same time. According to the method, the cleaning module is used for analyzing the first cleaning effect on twoparts of target articles to judge the first cleaning efficiency and the cleaning degree of the two parts of the target articles, and then a second cleaning scheme is formulated according to the cleaning degree of the two parts of the target articles in order to achieve high-efficiency cleaning of the target articles. Texture analysis is conducted on images under a complex background, more accuratecharacteristic information can be provided, and the quality of a prepared streptonigrin compound is improved.
Owner:XIHUA UNIV
Three-phase lcl type networked converter and method for multivariable feedback control
ActiveCN106451573BGood damping propertiesAchieve decouplingSingle network parallel feeding arrangementsEngineeringThree-phase
The invention discloses a multivariable feedback control type three-phase LCL networking converter and a method. The networking converter comprises a first summator, a second summator, a third summator, a fourth summator, a first controller, a second controller, a first compensator and a second compensator. An input end of the first controller is connected to an output end of the first summator, a first input end of the third summator is connected to an output end of the first controller, a second input end of the third summator is connected to an output end of the first compensator, and an input end of the first compensator is connected with a state quantity. The third summator outputs d-axis modulating signals. An input end of the second controller is connected to an output end of the second summator, a first input end of the fourth summator is connected to an output end of the second controller, a second input end of the fourth summator is connected to an output end of the second compensator, and an input end of the second compensator is connected with the state quantity. The fourth summator outputs q-axis modulating signals. The multivariable feedback control type three-phase LCL networking converter and the method have advantages of high stability, high steady state precision, low dynamic response fluctuation and high speed.
Owner:HUAZHONG UNIV OF SCI & TECH
Rolling mechanism of drive shaft of woodworking machine
Owner:KUANG YUNG MACHINERY
Kitchen garbage truck box and garbage truck
The invention provides a kitchen garbage truck box and a garbage truck, and relates to the technical field of garbage trucks. The kitchen garbage truck box comprises a cuboid truck box body, wherein a liquid storage cavity is formed in the truck box body, a pouring opening communicating with the liquid storage cavity is formed in the side wall of the truck box body, a plurality of baffles are arranged in the liquid storage cavity at intervals, and cavities formed between any two baffles communicate with each other; the baffle plates are fixed on the truck body. According to the kitchen garbage truck box, liquid garbage can be placed in the truck box, bumping of the liquid garbage in the transportation process is reduced, the transportation capacity is large, and the transportation efficiency is high. In addition, the invention further provides a garbage truck. The garbage truck comprises the kitchen garbage truck box, and therefore the liquid garbage can be transported conveniently.
Owner:JIANGYOU GUANGHONG RENEWABLE RESOURCE RECYCLING CO LTD
Method and device for optimizing AC channel power transmission capacity in AC-DC hybrid power grid
ActiveCN107732899BImprove transmission capacityReduce outputAc network circuit arrangementsHysteresisPower grid
The invention provides an alternating current channel transmission capacity optimization method and device in an alternating current / direct current hybrid power system. The method comprises the stepsthat double-machine equivalence is carried out on a transmission-side alternating current system according to the dynamic response curve of an alternating current / direct current hybrid power grid, soas to acquire a leading generator group and a hysteresis generator group; Thevenin equivalence is carried out on the alternating current / direct current hybrid power grid from the direct current side according to the leading generator group and the hysteresis generator group; and finally the operation mode of the alternating current / direct current hybrid power grid is adjusted according to the Thevenin equivalence result of the alternating current / direct current hybrid power grid; and the alternating current channel transmission capacity is optimized in the direct current hybrid power grid. According to the invention, the problem that an alternating current channel is impacted by the collapse of the transmission power of a direct current transmission system during a recovery process and thevoltage drop of a direct current conversion bus after the generator group oscillating aroused by certain faults in the transmission-side alternating current system is solved; and reference is provided for a power grid operator to arrange the operation mode of the alternating current / direct current hybrid power grid reasonably to ensure safe and stable operation of the alternating current / direct current hybrid power grid.
Owner:CHINA ELECTRIC POWER RES INST +2
A Realization Method of Nuclear Reactor Load Tracking
ActiveCN107945889BOscillation amplitude is smallAvoiding the set of disadvantages that come with inserting the coreNuclear energy generationNuclear reaction controlNuclear reactorControl power
The invention discloses a method for implementing load tracking of a nuclear reactor. The method adopts two sets of relatively independent control rod groups for the reactivity and axial power offset power control of the nuclear reactor; the two sets of control rod groups are T rod groups and T rod groups respectively. K rod group, wherein, the K rod group is composed of many bundles of black rods, and the T rod group includes many bundles of gray rods and black rods; during the base load operation of the nuclear reactor, only the K rod group is inserted into the core, and the K rod group The insertion depth is greater than or equal to the bite amount plus 24 steps; during the load-following operation of the nuclear reactor, both the T-rod set and the K-rod set are inserted into the core. This method only requires one set of control rods to be inserted into the core during base load operation, and this method avoids uneven fuel burnup caused by too many control rods inserted into the core during base load operation, increased control rod fluence, control rod Disadvantages such as high fuel consumption of the absorber and increased load of the control rod drive mechanism.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Lure
InactiveCN102917584BGuaranteed performanceOscillation will not be interruptedBaitDecoyHorizontal axis
The invention relates to fishing, in particular, artificial baits, namely, the oscillating lures, and can be used by amateur fishermen while fishing. The lure comprises the elongated body with a weight, an opening for attaching a fishing line and at least one hook. The front, lower or tail portion of the body is provided with a plate holder having a ring at the end, said ring passing with a gap through two openings which are divided by a crosspiece and are arranged in the middle part of the plate on the vertical or horizontal axis at equal proximity to the center of symmetry thereof. The lateral portions of the plate are symmetrically convex (curved) relative to the vertical axis. The plate is fastened in an articulated manner to the ring and can be inclined in different planes from a central position perpendicular to the longitudinal axis of the lure, with the convex (curved) lateral portions of the plate being pointed forward in the direction of the lure movement. The result is a lure that works very effectively and carries out its function at a minimal execution rate, with a wide range of oscillations, namely, from aggressively vibrating oscillations with a high frequency and low amplitude to the oscillations working more gently and at a low frequency with an increase in the oscillation amplitude and without tangling the fishing line around the hook, and which would have ability of providing effective oscillations under condition of changing direction and speed of movement.
Owner:S·V·乌里阿诺夫
Method of Designing Suppressor Based on Energy Function
InactiveCN105811412BSafe and stable operationGood control effectFlicker reduction in ac networkPower oscillations reduction/preventionSuppressorElectric power system
The invention discloses a method for designing a suppressor based on an energy function, which includes the following steps: establishing a power system state space model with excitation and valve opening control, performing Taylor expansion on the established power system state space model, and realizing The method establishes the energy function to express the state space model of the power system based on the energy function: the suppressor is designed for the state space model of the power system expressed by the energy function:
Owner:SOUTHWEST JIAOTONG UNIV
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