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41results about How to "Solve voltage fluctuations" patented technology
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Direct-driving wave power-generating and energy-storing device and control method
ActiveCN102377192AImprove power densityIncrease energy densityAc network load balancingElectric energyDc converter
The invention relates to a direct-driving wave power-generating and energy-storing device and a control method. The direct-driving wave power-generating and energy-storing device is characterized by comprising a direct-driving wave generator, an AC / DC (Alternating Current or Direct Current) converter, a DC / AC (Direct Current or Alternating Current) converter, a plurality of loads, two DC / DC (Direct Current or Direct Current) converters, a mixed energy storing system and a controller, wherein the mixed energy storing system comprises an ultra-capacitor bank and a storage battery pack; the direct-driving wave generator is used for converting the kinetic energy of waves to a low frequency alternating current and sending to the AC / DC converter; the AC / DC converter is used for converting the low frequency alternating current to a direct current and connect and connected with the input end of the DC / AC converter through a direct current bus; the output end of the DC / AC converter is connected with the loads; the direct current bus is respectively connected with one ends of the two DC / DC converters, the other end of one of the two DC / DC converters is connected with the capacitor bank, and the other end of the other of the two DC / DC converters is connected with the storage battery pack; and the controller is used for controlling the ultra-capacitor bank and the storage battery pack to regulate power flow so as to keep the balance between the output power of the direct-driving wave generator and the power of the loads. The invention can be widely applied to the process of converting the kinetic energy of sea water fluctuation to the electric energy.
Owner:TSINGHUA UNIV
Photovoltaic grid-connected control method and system based on wave trap and proportional resonance controller
ActiveCN111193287AImprove power qualityImprove the ability of low voltage ride throughSingle network parallel feeding arrangementsAc network voltage adjustmentPower qualityVoltage amplitude
The invention discloses a photovoltaic grid-connected control method and system based on a wave trap and a proportional resonance controller. The method comprises the steps of: establishing a maximumpower point tracking model, a positive and negative sequence separation model, a current control model and an inverter control model with harmonic suppression, wherein the maximum power point trackingmodel calculates the start or stop of maximum power point tracking according to an input voltage amplitude signal; enabling the positive-negative sequence separation model to calculate positive-negative sequence components of the power grid voltage; enabling the current control model to calculate a power grid active and reactive current reference value according to the power grid voltage amplitude;, wherein the inverter control model comprises a voltage outer loop control model with a wave trap and a current inner loop model adopting a proportional resonance controller added with harmonic suppression control, and calculates an inverter output voltage reference value according to the positive-negative sequence components of the power grid voltage and the power grid active and reactive current reference value. According to the invention, the interference of the harmonic component on the system under the asymmetric fault is solved, and the electric energy quality of the whole photovoltaic grid-connected system in the low-voltage ride through process is improved.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
Active power distribution network pressure reactive power control method based on intelligent soft normally open point
ActiveCN105719196ASolve voltage fluctuationsFlexible controlData processing applicationsAc networks with different sources same frequencyDistributed generatorMathematical model
The invention provides an active power distribution network pressure reactive power control method based on an intelligent soft normally open point. The method comprises steps of according to a selected power distribution system, inputting initial values of circuit parameters, load levels, system operation voltage levels, branch current restraints, an accessing position, the type, capacity and parameters of a distributed generator, an accessing position, capacity and parameters of the intelligent soft normally open point, and standard voltage and standard power of the system; according to the provided power distribution system parameters, establishing an intelligent soft normally open point-based mathematic model for solving an active power distribution network pressure reactive power control problem; solving the obtained mathematic model by adopting an interior point method; and outputting solving results. According to the invention, via the IPOPT optimization algorithm, an active power transmission value and a reactive power compensation value of an SNOP are determined; and the adopted intelligent soft normally open point can flexibly controlling power, so when the intelligent soft normally open point is applied for improving voltage levels of an active power distribution network, quite favorable effects can be obtained.
Owner:TIANJIN UNIV
Voltage stability regulating system for distributed power connection and control method thereof
ActiveCN104538988AEfficient use ofImprove compatibilityFlexible AC transmissionSingle network parallel feeding arrangementsElectric powerLoad following power plant
The invention discloses a voltage stability regulating system for distributed power connection. A distributed power source comprises a photovoltaic power source body, a wind generation power source body and an energy storage device. A 'back-to-back'-based power electronic topological structure is adopted in the system, the system comprises a left power bridge and a right power bridge, the left power bridge is an STATCOM, and the right power bridge is a current transformer. A DSP controller module controls the STATCOM to provide reactive power for a PCC by modulating the PWM pulse of the left power bridge, the power generation efficiency of the wind generation power source body and the photovoltaic power source body and charging and discharging of the energy storage device are controlled by modulating the PWM pulse of the right power bridge, and the voltage stability of the PCC and the direct current side is achieved. The voltage fluctuation problem caused by load change and frequency fluctuation due to interruption of a power grid intermittent power source is solved, control over the voltage stability is achieved, and the compatibility and stability of the distributed power connection are improved.
Owner:GUANGXI UNIV
Power source distribution network with small electromagnetic band gap structure units
InactiveCN103683904ASmall sizeReduce the impact of continuityPower conversion systemsMiniaturizationUnit structure
The invention discloses a power source distribution network with small electromagnetic band gap structure units. An electromagnetic band gap structure is etched on a power source surface of the power source distribution network, the ground keeps complete based on the consideration of completeness of signals, and basic units of the plane electromagnetic band gap structure are composed of complementary split ring resonators. The power source distribution network with the small electromagnetic band gap structure units effectively resolves the problem of noise suppression of a synchronous switch in a mixing circuit system, and compared with other typical plane electromagnetic band gap structures, the size of the unit structure can be reduced. In addition, the noise suppression performance of the power source distribution network is hardly influenced by the tiny variation of the size, and the power source distribution network is good in robustness and can be effectively applied to a high-speed multi-layer circuit design.
Owner:SHANGHAI JIAO TONG UNIV
Method for carrying out intelligent control on dynamic reactive power compensation of SVG (TSC) (static var generator (thyristor switched capacitor))
InactiveCN102684203ASolve the problem of reversing reactive powerSolve voltage fluctuationsFlexible AC transmissionReactive power adjustment/elimination/compensationPower compensationElectric power system
The invention discloses a method for carrying out intelligent control on the dynamic reactive power compensation of a SVG (TSC) (static var generator (thyristor switched capacitor)), which comprises the following steps of: controlling the SVG and the TSC by using a master control unit; carrying out centralized sampling, calculation and control by using the master control unit, and automatically adjusting to adopt a reactive power compensation mode of the SVG and adopt a reactive power compensation mode of the TSC; and preferably starting the reactive power compensation mode of the SVG, and when the SVG has a fault, adopting the reactive power compensation mode of the TSC. When the reactive power demand of a system is instantly changed dynamically, the SVG starts a PWM (pulse-width modulation) control program at a predetermined response speed firstly, and then outputs compensation currents so as to rapidly and dynamically adjust the variable quantity of reactive power; and when the load of the electric power system is changed within a large range and exceeds the capacity of the SVG, a grouping switch function of the TSC is started so as to compensate the reactive power demand of the system. The method for carrying out intelligent control on the dynamic reactive power compensation of the SVG (TSC), disclosed by the invention, has the advantages that: the response speed of reactive power compensation can be improved, an effect of carrying out dynamic and continuous adjustment on reactive power can be achieved, and the like.
Owner:安徽华祝电气技术有限公司
Dynamic compensation control method and system for microgrid based on distributed residual error generator
ActiveCN110460100ARealize the Comprehensive Treatment of Power Quality ProblemsAchieve governanceSingle network parallel feeding arrangementsMicrogridPower grid
The invention relates to a dynamic compensation control method and system for a microgrid based on a distributed residual error generator. The method comprises the steps of establishing a state spaceequation of the distributed residual error generator according to an obtained state space equation of the ith inverter when N inverters are connected in parallel, and obtaining a control model based on the distributed residual error generator; converting the control model based on the distributed residual error generator into a model taking disturbance di as input, calculating a dynamic compensation controller Q(s) to obtain a dynamic compensation control model based on the distributed residual error generator, and adding the dynamic compensation control model into droop control to generate acompensation control strategy so as to perform dynamic compensation control on the microgrid. The plug and play of the inverter and the load can be realized according to the invention.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY +2
Method and system for dynamic optimization control of electric power system
InactiveCN102170128ALimit smallReduce power consumptionAc network voltage adjustmentElectric energyEngineering
The invention discloses a method and a system for the dynamic optimization control of an electric power system, which relates to the technical field of the planning and the control of the electric power system. The method comprises the following steps of: (1) sectionalizing a load curve, minimizing the sum of the load variances in all the periods of time, maximizing the differences between the load averages of all the adjacent periods of time; and (2) supplying power to a load according to the sectionalization result in step 1. The invention ensures that the sum of the load variances in all the periods of time is minimized and the differences between the load averages of all the adjacent periods of time are maximized when the load curve is sectionalized so as to solve the problem of larger voltage fluctuation and electric energy loss caused by unreasonable optimization in the prior art.
Owner:CHINA AGRI UNIV
Direct hanging type large-capacity electric energy quality comprehensive managing device for electrified railway
ActiveCN103560508AFlexible configurationLow costReactive power adjustment/elimination/compensationReactive power compensationHarmonicActive compensation
The invention discloses a direct hanging type large-capacity electric energy quality comprehensive managing device for an electrified railway. The direct hanging type large-capacity electric energy quality comprehensive managing device comprises an active compensation system and a passive compensation system. The passive compensation system comprises two passive high-pass filters for filtering higher harmonics out and providing partial capacitive reactive power, and the active compensation system is formed by connecting a plurality of active compensation units in parallel. The direct hanging type large-capacity electric energy quality comprehensive managing device has the advantages of being simple in structure, low in cost, good in reliability, capable of solving various electric energy quality problems and the like.
Owner:ZHUZHOU NAT ENG RES CENT OF CONVERTERS
Novel system and method for managing electrification railway electric energy quality
ActiveCN105281336ASolve voltage fluctuationsSolve side negative sequence problemReactive power adjustment/elimination/compensationAc network voltage adjustmentLow voltageEngineering
The invention discloses a novel system and method for managing electrification railway electric energy quality, wherein the system comprises a traction transformer with a filter winding, a sensing filter circuit, an MMC compensation system, an MMC controller, a voltage and electric current measuring apparatus; the traction transformer high voltage side is connected to electric network; a traction side is connected to a traction arm of an electric locomotive for providing electric power for the electric locomotive; and a low voltage compensation side is connected to the sensing filter circuit and the MMC compensation system. The MMC compensation system is constituted by two connected to single-phase MMC traction arm groups; direct current sides of the two MMC traction arm groups are connected together through a serial capacitor; and a grounding point of the MMC compensation system is led out in the geometric midpoint of the serial capacitor. With the method, harmonic waves are dynamically tracked and suppressed through the MMC technology and the sensing filter technology; active power balance and reactive power adjustment are performed to the load at two traction sides, thereby achieving the purposes of managing the harmonic waves, reactive power and negative sequence of the traction transformer high-voltage side of the electrification railway.
Owner:HUNAN IND POLYTECHNIC
A method and apparatus for control a self-energy storage multi-end flexible system
ActiveCN109038642AGuaranteed uptimeSolve power problemsElectric power transfer ac networkTechnical supportPower oscillation
A method and a device for control a self-energy storage multi-end flexible system are disclosed, Based on the mathematical model of self-energy storage multi-terminal flexible system, a coordinated control strategy based on voltage margin control is proposed. The control strategy is designed for the typical operating mode of the system, and the working principle of the system is analyzed in detail, so that the system can run stably under different operating conditions. A command filter backstepping voltage controller is designed to solve the problem of power oscillation and voltage fluctuationcaused by system mode switching and to improve the robustness and dynamic response performance of the system. Simulation results verify the feasibility and effectiveness of the proposed method, whichprovides theoretical basis and technical support for coordinated control of self-energy storage multi-terminal flexible system.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
High voltage ride-through control method for double-fed fan after considering power constraint of converter
InactiveCN110401225AGuaranteed safe operationSolve voltage fluctuationsSingle network parallel feeding arrangementsWind energy generationOvervoltageElectricity
The invention relates to a high voltage ride-through control method for a double-fed fan after considering a power constraint of a converter. When a doubly-fed wind turbine encounters a high voltage of a system, the main control gives control of the wind turbine power to a converter, the controller performs control, and a DC unloading Chopper circuit connected on a DC bus in parallel is input to develop the high-through control; after the high voltage is over, the main control restores control of the wind turbine power. The high voltage ride-through control method solves the problems of DC busvoltage fluctuation and grid side current distortion due to the overvoltage in the transient process, and ensures the safe operation of the wind power system during the fault ride-through.
Owner:STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
Power distribution network in high-speed circuit system
InactiveCN102522962AReduce radiation lossBreak continuityDigital technique networkCapacitanceReturn current
The invention discloses a power distribution network in a high-speed circuit system. The metal surface at one side of a buried capacitor is locally etched with a complementary split ring resonator, and the metal surface at the other side of the buried capacitor keeps complete; and simultaneously, the upper side and the lower side of the buried capacitor are respectively added with a layer of FR-4 medium, and SMA (shape memory alloy) coaxial joints are used for connecting a circuit board to a vector network analyzer to test a noise suppression transmission coefficient among ports. According to the power distribution network, the problems that the noise suppression band of a synchronous switch in the high-speed circuit system is not wide and the suppression degree is not deep are effectively solved, and simultaneously the damage for a return current path of a circuit is less. The mixed high-speed circuit system based on the power distribution network has good power integrity, and is convenient for standard technical processing of printed circuit boards.
Owner:SHANGHAI JIAO TONG UNIV
Wireless acquisition terminal based on solar energy and RF technology
InactiveCN101533055AGuaranteed uptimeMonitoring failureBatteries circuit arrangementsTransmission systemsTransformerComputer terminal
The invention relates to an acquisition terminal mainly applied to monitoring a power transformer in real time, in particular to a wireless acquisition terminal based on solar energy and RF (Radio Frequency) technology. The wireless acquisition terminal comprises a power supply, a plurality of branch controllers with sensors used for measuring data of the power transformer, and a main controller used for processing the data. The branch controllers are provided with an RF transmission terminal respectively; the main controller is provided with an RF receiving terminal and a GSM communication module capable of sending signals to a dispatching center or a mobile phone; and the power supply is a storage battery which is connected with a solar charger and a solar polar plate. The acquisition terminal has the advantages of stable systematic operation, less investment, convenient equipment installation, low cost, and energy conservation and environmental protection.
Owner:QILU UNIV OF TECH
Wide-stop-band noise suppression structure applied to power distribution network in system-in-package and intelligent optimization design method of wide-stop-band noise suppression structure
ActiveCN110147616AAvoid damageImprove signal integrityCAD circuit designSpecial data processing applicationsEngineeringNoise suppression
The invention relates to a wide-stop-band noise suppression structure applied to a power distribution network in system-in-package and an intelligent optimization design method thereof. Compared withthe prior art, the defects that the noise suppression structure is low in efficiency, long in design period and difficult to optimize the design are overcome. According to the invention, a rectangulararea is divided on a device bearing copper plate; wherein the four sides of the rectangular area are composed of 72 rectangular blocks, the areas of the 72 rectangular blocks are the same, the transverse side of the rectangular area is formed by 20 rectangular blocks which are regularly arranged in two rows, the vertical side of the rectangular area is formed by 16 rectangular blocks which are regularly arranged in two columns, and a plurality of rectangular blocks are etched into a hollow structure. The shape of the electromagnetic band gap structure is designed on the power layer of the power distribution network, so that the noise suppression low-frequency cut-off frequency is reduced, and the noise suppression frequency bandwidth range is increased; the size of the distribution network is automatically optimized through an automatic optimization method, and the noise suppression depth is increased.
Owner:ANHUI UNIVERSITY
Direct-driving wave power-generating and energy-storing device and control method
ActiveCN102377192BImprove power densityIncrease energy densityAc network load balancingWave powerKinetic energy
The invention relates to a direct-driving wave power-generating and energy-storing device and a control method. The direct-driving wave power-generating and energy-storing device is characterized by comprising a direct-driving wave generator, an AC / DC (Alternating Current or Direct Current) converter, a DC / AC (Direct Current or Alternating Current) converter, a plurality of loads, two DC / DC (Direct Current or Direct Current) converters, a mixed energy storing system and a controller, wherein the mixed energy storing system comprises an ultra-capacitor bank and a storage battery pack; the direct-driving wave generator is used for converting the kinetic energy of waves to a low frequency alternating current and sending to the AC / DC converter; the AC / DC converter is used for converting the low frequency alternating current to a direct current and connect and connected with the input end of the DC / AC converter through a direct current bus; the output end of the DC / AC converter is connected with the loads; the direct current bus is respectively connected with one ends of the two DC / DC converters, the other end of one of the two DC / DC converters is connected with the capacitor bank, and the other end of the other of the two DC / DC converters is connected with the storage battery pack; and the controller is used for controlling the ultra-capacitor bank and the storage battery pack to regulate power flow so as to keep the balance between the output power of the direct-driving wave generator and the power of the loads. The invention can be widely applied to the process of converting the kinetic energy of sea water fluctuation to the electric energy.
Owner:TSINGHUA UNIV
Short-delay circuit breaker and tripping loop and operating mechanism thereof
InactiveCN107017134ASolve voltage fluctuationsProtective switch operating/release mechanismsCurrent limitingPower circuits
The invention provides a short-time-delay circuit breaker and its opening circuit and operating mechanism. The operating mechanism includes an opening circuit. There is a first current-limiting resistor used to reduce the working current of the opening electromagnetic coil; the first current-limiting resistor is connected in parallel with an auxiliary switch that is closed when the circuit breaker is in the opening action and is turned off after the opening action is completed. In the technical solution provided by the present invention, the auxiliary switch is connected in parallel with the first current-limiting resistor. When the circuit breaker opens, the auxiliary switch is controlled to close. At this time, the voltage at both ends of the circuit breaker electromagnetic coil is higher than its rated voltage, and the circuit breaker can Quickly act to complete the opening; then turn off the auxiliary switch, at this time the first current limiting resistor is connected to the opening circuit to reduce the current in the circuit. Since both the first current-limiting resistor and the auxiliary switch are non-energy storage components, voltage fluctuations in the opening circuit will not be caused during switching.
Owner:PINGGAO GRP +3
Multifunctional three-phase voltage regulation device
PendingCN109347112AFlexible adjustmentSolve the problem of low voltage at the endReactive power adjustment/elimination/compensationAc network voltage adjustmentPhase currentsElectricity
The invention discloses a multifunctional three-phase voltage regulation device, which comprises an A phase voltage regulator, a B phase voltage regulator, a C phase voltage regulator, an A phase current transformer, a B phase current transformer, a C phase current transformer, a control unit, and a three-phase linkage and single-control knob, wherein a three-phase circuit is independently connected with the control unit through the A phase voltage regulator, the B phase voltage regulator, the C phase voltage regulator, the A phase current transformer, the B phase current transformer and the Cphase current transformer, and the three-phase linkage and single-control knob is connected with the control unit for switching between the three-phase linkage knob and a split-phase knob. By use ofthe device, three-phase synchronous voltage regulation can be realized, three-phase independent voltage regulation also can be carried out, a regulation way is flexible, the problem of terminal low voltage caused by an overlong courts power supply radius can be effectively solved, the problem of voltage fluctuation caused by peak and valley periods and seasonal electricity utilization can be solved, and practical application requirements are met.
Owner:ZHONGQI ELECTRIC POWER EQUIP CO LTD
Low-voltage power distribution network real-time voltage control method based on user side flexible resources
ActiveCN112670999AReal-time voltage controlVoltage control helpsEnergy storageAc network load balancingOvervoltageEdge node
The invention discloses a low-voltage power distribution network real-time voltage control method based on user side flexible resources. The method comprises the following steps: S10, establishing a voltage demand response model of the user side flexible resources; S20, carrying out user side edge node distributed real-time voltage control; and S30, optimizing an edge node voltage control rule based on reinforcement learning. According to the edge node distributed real-time voltage control method based on the artificial intelligence technology, the problems that voltage fluctuation is aggravated and overvoltage is caused by inverse power flow due to the fact that photovoltaic power generation output has the characteristics of intermittency and volatility are solved.
Owner:HANGZHOU DIANZI UNIV
Terminal compensation control method for intermediate frequency power supply system
ActiveCN106253296AImprove dynamic compensation abilityAdded Feedforward CompensationAc network voltage adjustmentVoltage amplitudePhase shifted
The invention relates to a terminal compensation control method for an intermediate frequency power supply system. A phase-locked loop is adopted for tracking a terminal input voltage phase position of the intermediate frequency power supply system, the phase position is subjected to phase shift operation and feedforward compensation operation based on an output current and a wire cable phase shift coefficient, and a terminal output voltage reference phase position is obtained; based on the terminal output voltage reference phase position, terminal output voltage can be dynamically compensated in a real time manner via staggering of switching frequencies and adjustment of alternating current quantity proportional resonance under a stationary coordinate system. Terminal compensation control in the terminal compensation control method for the intermediate frequency power supply system is dual compensation for an output voltage amplitude and phase position; line inductive reactance between terminal output and a load is taken into consideration, feedforward compensation of a reference voltage phase position is added, a problem of voltage fluctuation caused via load switching operation is solved, compensation voltage is subjected to under alternating current quantity proportional resonance adjustment under the stationary coordinate system, terminal dynamic compensation capability is improved, and a problem of an instantaneous voltage decline can be solved.
Owner:NAVAL UNIV OF ENG PLA
Ultra-wideband plane electromagnetic band-gap structure for suppressing high-speed circuit ground bounce noise
InactiveCN104332677ASolve voltage fluctuationsSmall sizeWaveguide type devicesRadio frequencySplit-ring resonator
The invention discloses a ultra-wideband plane electromagnetic band-gap structure for suppressing high-speed circuit ground bounce noise. The structure comprises a power supply layer, a high-speed microwave dielectric layer and a ground layer which are connected from top to bottom in sequence; the power supply layer comprises a plurality of basic cyclic units which are connected by a plurality of resonators through a connecting bridge. According to the technical scheme, the structure has the beneficial effects that the problem of voltage fluctuation caused by the transient current change in a high-speed hybrid circuit system can be effectively solved; the synchronous switching noise produced in the power distribution network can be obviously suppressed; the interference to a radio frequency / analog circuit in the hybrid circuit system can be reduced, and the resulting misoperation of a chip is avoided; a complementary split ring resonator is used to form the basic unit of the electromagnetic band-gap structure; therefore, the size of the unit structure can be reduced while the expected noise suppressing performance is reached; a cross connecting bridge is introduced, which can change the suppression depth, and thus the noise suppressing frequency band range can be expanded.
Owner:SHANGHAI JIAO TONG UNIV
Charge control of a metal-air battery
ActiveCN106575800ASolve voltage fluctuationsAvoid damageFuel and secondary cellsSecondary cells charging/dischargingElectrode potentialCharge current
The invention relates to a method for managing the charge of a metal-air battery comprising at least one cell (10, 11, 12). The cell comprises a negative electrode (1), a first positive air electrode (2) and a second positive oxygen-release electrode (3). For each cell, during the application of a charge current circulating in the cell between the negative electrode (1) and the second positive oxygen-release electrode (3), the absolute value of a potential of the negative electrode (1) is compared with a critical threshold value (50), the potential of the negative electrode (1) being determined relative to the first positive air electrode (2). When the absolute value of the potential (301) of the negative electrode (1) reaches the threshold value, a surplus charging current, depending on the difference between the current applied to the cell and the charging current, is diverted.
Owner:ELECTRICITE DE FRANCE
A subway train voltage fluctuation prevention device
PendingCN109720241AImprove ride comfort performanceSolve voltage fluctuationsPower supply linesAc network voltage adjustmentMemristorPantograph
The invention discloses a subway train voltage fluctuation prevention device. The voltage fluctuation prevention device comprises a voltage transformer 1, a voltage detection module 2, a memristor control module 3, a memristor driving module 4 and a memristor Rm. When the voltage of the pantograph passes through the main transformer, the input voltage is changed, the voltage transformer 1 convertsa voltage signal into a numerical signal through the voltage detection module 2 and sends the numerical signal to the memristor control module 3, and the memristor control module 3 changes the memristor value of the memristor Rm through the memristor driving module 4, so that the stability of the input voltage is realized. The subway train voltage fluctuation prevention device provided can effectively solve the problem of voltage fluctuation existing in contact network power supply, improve the running stability of the subway train and improve the riding comfort of a subway.
Owner:XIHUA UNIV
Direct-current micro-grid control system, control method, storage medium, equipment and application
PendingCN113471952AEase wasteSolve voltage fluctuationsLoad balancing in dc networkDc source parallel operationPower gridConverters
The invention belongs to the technical field of power distribution, and discloses a direct-current micro-grid control system, a control method, a storage medium, equipment and application. According to the method, after rectifiers are connected in parallel, power values transmitted by lines can present economically distributed rectifier parallel modules in the lines with different parameters; rectified output direct-current sides of frequency converters are connected in parallel to form a direct-current bus, and the direct-current bus is connected to a direct-current bus module of a photovoltaic and energy storage link; and the direct currents rectified and output by the frequency converters are output to a parallel inverter module at a load side in a parallel inversion manner. According to the invention, the voltage fluctuation of the direct-current side is reduced, the power supply reliability is improved, the power can be economically distributed in lines with different parameters, the economy of an oil well power supply system is improved, the unified formulation of a voltage sag and short-time interruption treatment scheme is facilitated, the problem of low voltage caused by a long line and a heavy load is solved, load reverse power generation and unified energy feedback of photovoltaic subunits are facilitated, and the system is suitable for oil well power supply systems, port ship crane systems and other scenes.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Method for carrying out intelligent control on dynamic reactive power compensation of SVG (TSC) (static var generator (thyristor switched capacitor))
InactiveCN102684203BLarge adjustment rangeSolve the problem of reversing reactive powerFlexible AC transmissionReactive power adjustment/elimination/compensationAuto regulationPower compensation
Owner:安徽华祝电气技术有限公司
Super-conduction and normal-conduction compound flat-wave current limiting reactor and control method thereof
InactiveCN104900388AAvoid safety hazardsEfficient smoothingDc network circuit arrangementsTransformers/inductances coils/windings/connectionsPower gridInductance
The invention discloses a super-conduction and normal-conduction compound flat-wave current limiting reactor. The reactor mainly comprises a super-conduction inductance coil, a super-conduction switch combination, a forward wound normal-conduction inductance coil, a reverse wound normal-conduction inductance coil and a normal-conduction switch combination. A first super-conduction non-resistance switch in the super-conduction switch combination is connected in parallel with the super-conduction inductance coil. A second super-conduction non-resistance switch is connected in parallel with a super-conduction current limiting switch and then connected in series with the super-conduction inductance coil. The super-conduction switch combination and the normal-conduction switch combination are switched through the connection state of an inner switch to achieve combined serial and parallel connections among the super-conduction inductance coil, the super-conduction switch combination, the normal-conduction inductance coil and the normal-conduction switch combination, and accordingly, the super-conduction and normal-conduction compound flat-wave current limiting reactor with variable inductance values and variable resistance values is achieved. Application characteristics of single super-conduction reactors and single normal-conduction reactors are combined, efficient direct-current power grid smoothing and current limiting functions are provided, and the super-conduction reactor operation efficiency and the reactor economy are improved.
Owner:TIANJIN UNIV
Voltage stability regulation system connected to distributed power supply and its control method
ActiveCN104538988BEfficient use ofImprove compatibilityFlexible AC transmissionSingle network parallel feeding arrangementsEngineeringElectric power
The invention discloses a voltage stability regulating system for distributed power connection. A distributed power source comprises a photovoltaic power source body, a wind generation power source body and an energy storage device. A 'back-to-back'-based power electronic topological structure is adopted in the system, the system comprises a left power bridge and a right power bridge, the left power bridge is an STATCOM, and the right power bridge is a current transformer. A DSP controller module controls the STATCOM to provide reactive power for a PCC by modulating the PWM pulse of the left power bridge, the power generation efficiency of the wind generation power source body and the photovoltaic power source body and charging and discharging of the energy storage device are controlled by modulating the PWM pulse of the right power bridge, and the voltage stability of the PCC and the direct current side is achieved. The voltage fluctuation problem caused by load change and frequency fluctuation due to interruption of a power grid intermittent power source is solved, control over the voltage stability is achieved, and the compatibility and stability of the distributed power connection are improved.
Owner:GUANGXI UNIV
A self-storage multi-terminal flexible straight system control method and device
ActiveCN109038642BGuaranteed uptimeSolve power problemsElectric power transfer ac networkMathematical modelControl engineering
The invention discloses a control method and device for a self-storage multi-terminal flexible straight system. On the basis of establishing a mathematical model of a self-storage multi-terminal flexible straight system, a coordinated control strategy based on voltage margin control is proposed, and the typical operation of the system Model design control strategy, detailed analysis of the working principle of the system, so that the system can run stably under different working conditions. Designing a command filtering back-push voltage controller solves the problem of power oscillation and voltage fluctuation caused by system mode switching, and improves the robustness and dynamic response performance of the system. The simulation verifies the feasibility and effectiveness of the proposed method, and provides a theoretical basis and technical support for the coordinated control of the self-storage multi-terminal flexible straight system.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
Sensor excitation circuit based on D-type power amplifier
ActiveCN113114139AReduce power consumptionReduce feverAmplifier with semiconductor-devices/discharge-tubesLoop controlSoftware engineering
The invention discloses a sensor exciting circuit based on a D-type power amplifier, and the D-type power amplifier is applied to an inductive displacement sensor exciting circuit, so that the circuit loss is greatly reduced, and the efficiency is improved. Through the design of the amplitude stabilizing circuit with closed-loop control, the problem of voltage fluctuation after the D power amplifier is loaded is solved. And self-excitation generated by the circuit after closed-loop control is introduced into the amplitude stabilizing circuit is eliminated through a phase-leading correction link. For an inductive sensor system which has a high-power requirement or is sensitive to power consumption, the inductive sensor excitation circuit based on the D-type power amplifier can greatly reduce the measurement loss of the inductive sensor and improve the working performance of the inductive sensor.
Owner:TSINGHUA UNIV
A device and method based on continuous anode aluminum electrolysis
The invention discloses a continuous-anode-based aluminum electrolysis device. The continuous-anode-based aluminum electrolysis device comprises an aluminum electrolysis cell, an anode structure, an electricity feeding device and a shell crushing and discharging mechanism, the anode structure is arranged above the aluminum electrolysis cell, and the shell crushing and discharging mechanism is arranged on the outer side of the anode structure. The continuous-anode-based aluminum electrolysis device is characterized in that the anode structure includes an anode frame and an anode, and the outerside wall of the anode frame is connected with a vertical wing plate; the electricity feeding device comprises a clamping mechanism and a conductive block, the clamping mechanism comprises two clamping jaws and a cylinder used for driving the two clamping jaws to open and close oppositely; the conductive block is fixed to the inner side of one of the clamping jaws, the conductive block is connected with the positive bar of the anode through flexible connection; and the clamping mechanism is used for clamping an anode frame wing plate. According to the continuous-anode-based aluminum electrolysis device, the problem of voltage fluctuations caused by a traditional electricity feeding mode is solved, and smoke at a discharging point can be collected to prevent the smoke leakage.
Owner:GUIZHOU BRANCH CHINA ALUMINUM IND
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