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36results about How to "Reduce current harmonic content" patented technology
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Single-phase five-level topology and inverter
ActiveCN104218832AReduce current harmonic contentReduce hardware costsAc-dc conversionThree levelPower inverter
The invention provides a single-phase five-level topology and an inverter. The single-phase five-level topology comprises a first capacitor, a three-level bridge arm module and four switching tubes, wherein the four switching tubes refer to a first switching tube, a fifth switching tube, a sixth switching tube and an eighth switching tube respectively; each switching tube is reversely connected in parallel with a diode; the three-level bridge arm module comprises two switching tubes and a double-switch unit; the first end of a third switching tube is connected with a first node, and the second end of the third switching tube is connected with a neutral point N through the double-switch unit; and the first end of a fourth switching tube is connected with N through the double-switch unit, and the second end of the fourth switching tube is connected with a second node. Five level states are output, the current harmonic content of a system is reduced, the filter inductance is reduced, the voltage level is raised, the common-mode voltage is restrained, and the running efficiency is increased. Balanced control of capacitor voltage under full power and full modulation can be realized without adding an additional hardware circuit, and the phase output voltage of the system is prevented from degrading from five levels to three levels.
Owner:SUNGROW POWER SUPPLY CO LTD
Co-rectifier transformer medium voltage type regenerative braking energy feedback device and control method thereof
InactiveCN107565826AEliminate circulationReduced footprintElectrodynamic brake systemsAc-dc conversionOvervoltageLow voltage
The invention discloses a co-rectifier transformer medium voltage type regenerative braking energy feedback device and a control method thereof; the feedback device comprises a rectifier transformer,an energy feedback unit, and a rectifier unit; a grid connected switch and an isolation transformer are respectively connected in series between the energy feedback unit and a rectifier transformer valve side winding; the energy feedback unit comprises two inverters; DC sides of the two inverters are provided with a single-knife-double-end isolation switch block; the DC sides of the two invertersare connected with a DC traction network through the single-knife-double-end isolation switch block; the feedback device control method comprises the following steps: starting, running and stopping the energy feedback unit according to a first startup threshold value, a second startup threshold value, an overvoltage protection value, a stop threshold value and a current gradient determination value. The feedback device can eliminate the circulation between the energy feedback unit and the rectifier unit, has a larger feedback capacity than a low voltage feedback device, has a simplified structure when compared with a conventional medium voltage feedback device, and uses less general assembly dimensions and land occupation areas, thus reducing cost, and providing good versatility.
Owner:ZHUZHOU CSR TIMES ELECTRIC CO LTD
Working method of grid-connected photovoltaic power generation system
InactiveCN101710718AReduce current harmonic contentReduce harmonic contentAc-dc conversionSingle network parallel feeding arrangementsPower gridPower factor
The invention relates to a grid-connected photovoltaic power generation system which consists of a phase-locked loop, a current transformator, a repetitive controller and a PWM generator. The invention also relates to a working method of the grid-connected photovoltaic power generation system, comprising the steps of: (1) acquiring network voltage phase position and grid-connected current; (2) designing the repetitive controller; (3) setting the modulation ratio, switch frequency and sampling times within unit cycle of an inverter; and (4) sending the output of the repetitive controller into the PWM generator, completing the switch operation for the inverter, and finally finishing grid-connected control for solar photovoltaic power generation. The invention has the advantages that the output waveform is greatly improved, the grid-connected current harmonic content is low, the total harmonic distortion is less than 1%, dc component is not contained, the power factor of the inverter is high, all indexes such as electrical energy quality and the like is in accordance with the requirement of grid-connected engineering technology, and the invention has application prospect.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Steady-state testing device and steady-state testing method for modularized multi-level converter valves
ActiveCN108279378ALow costReduce current harmonic contentCircuit interrupters testingCapacitanceDirect component
The invention provides a steady-state testing device and a steady-state testing method for modularized multi-level converter valves. The device comprises a load electric reactor, a sample valve, an auxiliary valve, a water cooler, a direct-current power supply, a controller and a protection device. Current alternating components and current direct components of the electric reactor can be controlled individually. The structure of a steady-state testing circuit is simple. The steady-state testing device and the steady-state testing method have the advantages that the auxiliary valve and the sample valve are controlled to be unlocked and locked in a charging phase and a testing phase, support capacitors in the auxiliary valve and the sample valve are charged in different phases, and steady-state testing of the modularized multi-level converter valves is realized; charging and energy supplement of the support capacitors in the auxiliary valve are performed only through N output interfacesin the direct-current power supply, and additional direct-current power supplies are not needed for charging of the support capacitors in the sample valve, so that the cost of the whole test circuitis low; the actual working conditions of the modularized multi-level converter valves can be represented completely.
Owner:CHINA EPRI ELECTRIC POWER ENG CO LTD
PWM rectification type energy feedback device
A PWM rectification type energy feedback device, based on improved phase amplitude control and PWM method thereof, estimates optimal value of feedback grid energy according to DC bus voltage and pumpascending rate thereof to be as reference input of an inverter; based on rotary coordinate change and model reference self-adaptive software lock phase ring technology and DSP and DC bus co-groundinginversion output voltage direct detection technology, the output end of the inverter can be precisely detected and avoid from DC component injection into the grid due to member feature drift or parameter change or current leakage. The optimization of feedback grid power causes the current to be in a continuous and relatively constant state, thus reducing current harmonic content injected into thegrid; fixed PWM ensures harmonic component to be fixed and to be high frequency, thus reducing the volume of the output end serial connected inducer and the switch noise; the software lock phase reduces hardware complexity and ensures the detection such as voltage fall, frequency drift and other grid faults to be more reliable.
Owner:盈威力新能源科技(上海)有限公司
High-power dimming electrodeless lamp
InactiveCN102307424ARealize dimming functionReduce temperature riseElectrical apparatusElectric lighting sourcesActive power factor correctionAlternating current
The invention discloses a high-power dimming electrodeless lamp. The high-power dimming electrodeless lamp comprises an anti-electromagnetic interference filter, a bridge rectifier module, an active power factor corrector, a half-bridge inverter oscillatory circuit, a power output device, a starting controller, a high-frequency coupler, a dimming circuit and an HB0809 integrated circuit, wherein the half-bridge inverter oscillatory circuit is used for converting a direct current voltage into a high-frequency alternating voltage; the power output device is used for supplying output power to the half-bridge inverter oscillatory circuit when the half-bridge inverter oscillatory circuit works; the starting controller is used for controlling the turning on and turning off of the electrodeless lamp; the high-frequency coupler is used for coupling electric energy of the active power factor corrector and the power output device to the lamp tube of the electrodeless lamp; the dimming circuit is connected with an externally connected dimming control circuit; when the externally connected dimming control circuit supplies a 0 to 10-volt direct current (VDC) dimming control voltage signal to the dimming circuit, the dimming circuit works and then converts the alternating voltage into a 18-volt direct voltage; and the HB0809 integrated circuit is connected to the half-bridge inverter oscillatory circuit and used for controlling the alternately turning on and turning off of a first metal oxide semiconductor (MOS) tube and a second MOS tube in the half-bridge inverter oscillatory circuit to set working frequency, ignition time and ignition frequency. By a dimming electrodeless lamp circuit, a dimming function of the high-power electrodeless lamp can be realized.
Owner:NINGGUO HUBANG ELECTRONICS TECH
Variable vector action duration-based permanent magnet synchronous motor current control method
InactiveCN111049458AGood precisionAccurate trackingElectronic commutation motor controlVector control systemsVoltage vectorMathematical model
The invention discloses a variable vector action duration-based permanent magnet synchronous motor current control method. The method comprises the following steps that: the mathematic model of a permanent magnet motor is discretized through zero-order keeping discretization, and so that the mathematic model of the permanent magnet motor can still have better precision at a lower sampling frequency; based on the zero-order keeping discretization mathematical model of the permanent magnet synchronous motor, dq-axis current components are respectively expressed as functions related to a vector action time t; and a corresponding action time topt under the condition that the difference between dq-axis current prediction values and reference values is minimum is obtained, the action time topt and corresponding candidate voltage vectors are substituted into a cost function, and a voltage vector enabling the minimum value of the cost function is selected as output to control the permanent magnet synchronous motor. According to the method, the zero-order keeping discretization method is used for discretizing the mathematical model of the permanent magnet motor, so that the accurate zero-order keeping discretization mathematical model of the permanent magnet synchronous motor is obtained, so that the system still has better accuracy at the lower sampling frequency.
Owner:TIANJIN UNIV
Electric generator control method based on power factor correction and rectification algorithm in micro grid construction
InactiveCN104009694AImprove operating conditionsStrong fault toleranceElectronic commutation motor controlVector control systemsCurrent mode controlActive power factor correction
The invention discloses a permanent magnetic wind electric generator control method based on a power factor correction and rectification algorithm in micro grid construction. A three-phase PMSG is controlled through a PFC method, and in order to meet the requirement for rotor position information needed in the control, an original position di / dt detection method, a rotation high-frequency voltage injection method and a double-salient-pole decoupling observer are combined. The three-phase PMSG is controlled through the PFC method, the original position di / dt detection method, the rotation high-frequency voltage injection method and the double-salient-pole decoupling observer are combined to accurately and effectively provide accurate and reliable rotor position information to current control of the PMSG, so that current harmonic content is reduced, power factors in the PMSG approach 1, direct-current output is maintained, and good control of the PMSG based on the PFC method is achieved.
Owner:SOUTHEAST UNIV
A single-phase five-level topology and inverter
ActiveCN104218832BReduce current harmonic contentReduce hardware costsAc-dc conversionThree levelHarmonic
Owner:SUNGROW POWER SUPPLY CO LTD
Double-rotor motor and air conditioning unit
ActiveCN112234785AIncrease stack heightIncrease the moment of inertiaMagnetic circuit rotating partsMagnetic circuit stationary partsElectric machineEngineering
The invention provides a double-rotor motor and an air conditioning unit. The double-rotor motor comprises a stator, an outer rotor and an inner rotor, the stator is fixedly arranged, the stator formsan outer stator section and an inner stator section which are connected along the height direction of the stator, the outer rotor is arranged on the outer side of the outer stator section, and the inner rotor is arranged on the inner side of the inner stator section. By means of the technical scheme, only the stacking height of the outer rotor with the large radius can be increased, the increasedcost is small, and the brought rotational inertia is obviously increased. The moment of inertia of the motor is increased, the torque fluctuation of low-frequency operation of a compressor is reduced, the low-frequency operation current fluctuation is reduced, the current harmonic content is reduced, the compression low-frequency operation rotating speed is more stable, and the efficiency of thecompressor in low frequency operation is enhanced.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
A six-level circuit topology for a power conversion system
ActiveCN108988672AReduce lossReduce voltage harmonicsEfficient power electronics conversionAc-dc conversionPower inverterCapacitance
The invention relates to a six-level circuit topology for a power conversion system, the circuit comprises a left circuit composed of first to fifth busbar capacitors connected in series in the same direction in turn, A first switching device A1, second switching device A2, third switching device A3, fourth switching device A4, fifth switching device A5, the sixth switching device A6 is sequentially connected in series on the right side, a first intermediate circuit composed of a ninth switching device A9, a second intermediate circuit composed of a seventh switching device A7 and a tenth switching device A10 in series, a third intermediate circuit composed of an eighth switching device A8 and an eleventh switching device A11 in series, a fourth intermediate circuit composed of a twelfth switching device A12, and three clamping capacitors. The invention can effectively reduce switching loss and voltage harmonics in the circuit, and can also control flexibly in controlling the switchingtransistor, and can be applied to power conversion devices such as inverters.
Owner:NORTHEASTERN UNIV
Double-cylinder variable-capacity compressor and air conditioner
PendingCN112253455AImprove efficiencyImprove energy efficiencyRotary/oscillating piston combinations for elastic fluidsMagnetic circuit stationary partsElectric machineLow load
The invention relates to a double-cylinder variable-capacity compressor and an air conditioner. The double-cylinder variable-capacity compressor comprises a motor and a pump body assembly, the motor comprises a stator and a rotor, the rotor is arranged in the stator, the rotor can drive the pump body assembly to work when rotating relative to the stator, the displacement of the pump body assemblyis V, the induction voltage constant between stator wires is E, and when the rotating speed of the motor is 1000 RPM, and E and V meet the following formula: E=kV, wherein the value range of k is 0.9-1. According to the double-cylinder variable-capacity compressor and the air conditioner, when the rotating speed of the motor is 1000 RPM, E and V meet the formula that E=(0.9-1) V, when the double-cylinder variable-capacity compressor is low in load, the operating frequency of the motor is lower, the current harmonic content of a motor winding is greatly reduced, meanwhile, the voltage harmoniccontent of the motor end is greatly reduced, the motor iron core loss is obviously reduced, and the motor winding loss is basically unchanged; and the motor efficiency is improved, and the energy efficiency of the double-cylinder variable-capacity compressor is improved.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
Urban rail power supply system double-coil connected medium-voltage energy-feeding system and its energy-feeding method
ActiveCN105226969BIncrease braking energyHigh energy saving rateClimate change adaptationAc-dc conversionLow voltage circuitsDual coil
The invention discloses a double-coil connected medium-voltage power feed system and a power feed method for an urban rail power supply system. The system includes a rectifier transformer, a double-coil connected power feed device and a rectifier unit. The type energy feed device comprises two double energy feed branches arranged in parallel, and each heavy energy feed branch includes an AC-side low-voltage circuit breaker, an isolation transformer, an inverter and a DC-side contactor arranged in series; the method steps include: When starting, the rectifier transformer and rectifier unit take current from the medium-voltage AC power grid and inject it into the DC traction network; Feed back the train braking energy to the medium voltage AC grid. The invention can realize energy saving and DC bus voltage stabilization, and has the advantages of high flexibility, small size, high degree of integration with existing systems, high power factor, low harmonics injected into the AC side, and good versatility.
Owner:宁波地铁产业工程有限公司 +1
Current conversion module and main structure thereof
PendingCN114079389ASimple structureReduce stray inductanceConversion constructional detailsCooling/ventilation/heating modificationsCapacitanceStray inductance
The invention provides a current conversion module and a main structure thereof. A direct-current capacitor busbar comprises a busbar body, and a rectification side connecting end, an inversion side connecting end and a capacitor side connecting end which are arranged on the busbar body. The direct current side of a rectification assembly is connected with the busbar body through the rectification side connecting end, a supporting capacitor assembly is connected with the busbar body through the capacitor side connecting end, the direct current side of an inversion assembly is connected with the busbar body through the inversion side connecting end, and therefore the main structure of the current conversion module integrates the rectification function and the inversion function. Moreover, the inversion side connecting end and the rectification side connecting end are respectively arranged at the two sides of the capacitor side connecting end, i.e., the supporting capacitor assembly is arranged between the rectification assembly and the inversion assembly, so that the paths from the rectification assembly and the inversion assembly to the supporting capacitor assembly are as short as possible, the stray inductance in the main structure of the converter module is reduced, and the safety and the reliability of the main structure of the converter module are improved.
Owner:CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
A steady-state test device and method for a modular multilevel converter valve
ActiveCN108279378BSimple structureSteady state test implementationCircuit interrupters testingCapacitanceAc components
The invention provides a steady-state test device and method for a modular multi-level converter valve. The device includes a load reactor, a sample valve, an auxiliary valve, a water cooling device, a DC power supply, a control device and a protection device, and the reactor The AC component of the current and the DC component of the current can be controlled separately, and the structure of the steady-state test circuit is simple. The steady-state test method provided by the present invention realizes modularization by unlocking or locking the auxiliary valve and the sample valve during the charging stage and the test stage, and charging the supporting capacitors in the auxiliary valve and the sample valve at different stages. Steady-state test of the level converter valve; the present invention only charges and supplements the support capacitor in the auxiliary valve through the N output interfaces provided by the DC power supply, and does not need to separately set up another DC power supply for the test valve. The charging of the supporting capacitor makes the cost of the whole test circuit lower, and the invention can fully reproduce the actual operating conditions of the modularized multilevel converter valve.
Owner:CHINA EPRI ELECTRIC POWER ENG CO LTD
Generator control method based on power factor correction rectification algorithm in microgrid construction
InactiveCN104009694BImprove operating conditionsStrong fault toleranceElectronic commutation motor controlVector control systemsCurrent mode controlMicrogrid
The invention discloses a permanent magnetic wind electric generator control method based on a power factor correction and rectification algorithm in micro grid construction. A three-phase PMSG is controlled through a PFC method, and in order to meet the requirement for rotor position information needed in the control, an original position di / dt detection method, a rotation high-frequency voltage injection method and a double-salient-pole decoupling observer are combined. The three-phase PMSG is controlled through the PFC method, the original position di / dt detection method, the rotation high-frequency voltage injection method and the double-salient-pole decoupling observer are combined to accurately and effectively provide accurate and reliable rotor position information to current control of the PMSG, so that current harmonic content is reduced, power factors in the PMSG approach 1, direct-current output is maintained, and good control of the PMSG based on the PFC method is achieved.
Owner:SOUTHEAST UNIV
A six-level circuit topology for power conversion systems
ActiveCN108988672BReduce lossHarmonic reductionEfficient power electronics conversionAc-dc conversionCapacitanceClamp capacitor
The invention relates to a six-level circuit topology structure for a power conversion system. The circuit includes a left circuit composed of first to fifth bus capacitors connected in series in the same direction, and a first switching device A1 and a second switching device. A2, the third switching device A3, the fourth switching device A4, the fifth switching device A5, and the sixth switching device A6 are connected in series in sequence to form the right circuit, the middle circuit one is composed of the ninth switching device A9, and the seventh switching device A7 The middle circuit 2 composed of the tenth switching device A10 in series, the middle circuit 3 composed of the eighth switching device A8 and the eleventh switching device A11 in series, the middle circuit 4 composed of the twelfth switching device A12, and three clamping capacitors . The invention can effectively reduce the switching loss, reduce the harmonics of the voltage in the circuit, can also flexibly control the switching tube, and can be applied to power conversion devices such as inverters.
Owner:NORTHEASTERN UNIV LIAONING
Double rotor motor and air conditioning unit
ActiveCN112234785BIncrease stack heightIncrease the moment of inertiaMagnetic circuit rotating partsMagnetic circuit stationary partsElectric machineClassical mechanics
The application provides a double-rotor motor and an air-conditioning unit. The double-rotor motor includes a stator, an outer rotor and an inner rotor, the stator is fixedly arranged, and the stator forms an outer stator section and an inner stator section connected along its height direction, the outer rotor is arranged outside the outer stator section, and the inner rotor is arranged on the inner stator section inside. By applying the technical solution of the present invention, only the stack height of the outer rotor with a larger radius can be increased, and the increased cost is less, but the resulting moment of inertia increases significantly. Increase the moment of inertia of the motor, reduce the torque fluctuation of the low-frequency operation of the compressor, reduce the current fluctuation of the low-frequency operation, reduce the harmonic content of the current, make the compression speed at low-frequency operation more stable, and improve the efficiency of the compressor at low-frequency operation.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
Harmonic current compensation device for rectifier
ActiveCN107834827BReduce current harmonic contentReduce manufacturing costPower conversion systemsCapacitanceControl signal
The present invention discloses a harmonic current compensation device used for a rectifier. The harmonic current compensation device comprises a harmonic injection circuit, and the harmonic injectioncircuit comprises a first filtering capacitor, a second filtering capacitor, a third filtering capacitor, a compensation filtering inductor, a first switching tube and a second switching tube. A first current detection module is used to detect a current flowing through the compensation filtering inductor, a second current detection module is used to detect a load current of the rectifier, a voltage detection module is used to detect the voltage of a three-phase power grid, and a control module is connected with the current detection modules, the voltage detection module, the control end of the first switching tube and the control end of the second switching tube separately and is used to generate a switch control signal according to the voltage of the three-phase power grid, the load current and the current flowing through the compensation filtering inductor and control the first and second switching tubes according to the switch control signal, thereby distributing a harmonic compensation current generated by the harmonic injection circuit to the three-phase power grid.
Owner:GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD +1
A Novel Single-Phase Hybrid Three-Level Rectifier
ActiveCN107896069BAchieve sinusoidalEasy sinusoidalAc-dc conversionSignal conditioning circuitsPower switching
A new single-phase hybrid three-level rectifier comprises a single-phase uncontrollable diode rectifier bridge, a filter, a single-phase VIENNA rectifier bridge, a voltage and current sampling circuit, and a signal conditioning circuit. Through employing the above structure and a single-period control algorithm, the rectifier is simple in control method, is simple in structure, and just needs to collect an output voltage and an input current. The rectifier is very high in robustness, is high in power density, is large in power factor, is stable in output voltage, and is high in system reliability. Compared with a conventional single-phase rectifier, the rectifier provided by the invention can greatly improve the conversion efficiency, is large in application range, can greatly reduce the voltage stress of a power switching tube through employing the three-level structure, and can save a large amount of material resources and financial resources.
Owner:CHINA THREE GORGES UNIV
Drive system of open-winding permanent magnet synchronous motor for mine traction and its working method
ActiveCN108696204BImprove startup characteristicsIncrease starting torqueAC motor controlElectric motor controlConvertersSynchronous motor
Owner:SHANGHAI JIAOTONG UNIV
Harmonic current compensation device used for rectifier
ActiveCN107834827AReduce current harmonic contentReduce manufacturing costPower conversion systemsControl signalHarmonic
The present invention discloses a harmonic current compensation device used for a rectifier. The harmonic current compensation device comprises a harmonic injection circuit, and the harmonic injectioncircuit comprises a first filtering capacitor, a second filtering capacitor, a third filtering capacitor, a compensation filtering inductor, a first switching tube and a second switching tube. A first current detection module is used to detect a current flowing through the compensation filtering inductor, a second current detection module is used to detect a load current of the rectifier, a voltage detection module is used to detect the voltage of a three-phase power grid, and a control module is connected with the current detection modules, the voltage detection module, the control end of the first switching tube and the control end of the second switching tube separately and is used to generate a switch control signal according to the voltage of the three-phase power grid, the load current and the current flowing through the compensation filtering inductor and control the first and second switching tubes according to the switch control signal, thereby distributing a harmonic compensation current generated by the harmonic injection circuit to the three-phase power grid.
Owner:GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD +1
Motor starting control method, device and equipment and storage medium
InactiveCN112803843AReduce current harmonic contentReduce operating burdenTorque ripple controlElectric motor controlElectric machineControl engineering
The invention relates to the technical field of motors, and discloses a motor starting control method, device and equipment and a storage medium. The motor starting control method comprises the steps of: judging whether a motor enters a preset rotating speed interval or not according to a current rotating speed value of the motor when the motor is started; when the motor enters the preset rotating speed interval, determining the frequency amplification of the switching frequency according to the switching error time of the motor and the current rotating speed value of the motor; and updating the first switching frequency according to the frequency amplification to obtain an updated switching frequency, and controlling the motor to start according to the updated switching frequency. When the motor enters the preset rotating speed interval, the first switching frequency is updated according to the rotating speed value of the motor and the switching error time, and the motor is controlled to be started according to the updated switching frequency, so that the current harmonic content of the motor in the low-speed starting stage can be effectively reduced, the noise in the starting stage is reduced, and the operation burden of a micro-control unit of the controller is not increased.
Owner:GUANGDONG WELLING ELECTRIC MACHINE MFG +1
Hybrid conduction mode-based novel single-phase PFC and control method thereof
InactiveCN109560697ASmall sizeImprove power densityEfficient power electronics conversionAc-dc conversionPower factorEngineering
The invention discloses a hybrid conduction mode-based novel single-phase PFC. The hybrid conduction mode-based novel single-phase PFC comprises a main circuit, a current sampling circuit, a voltage sampling circuit and a signal conditioning circuit, wherein the current sampling circuit, the voltage sampling circuit and the signal conditioning circuit are connected with the main circuit, the signal conditioning circuit is connected with the main circuit, the current sampling circuit and the voltage sampling circuit and employs single-period control of a hybrid conduction mode, and two controlmodes of a continuous conduction mode and a disconnection conduction mode are used. The invention also provides a control method of the hybrid conduction mode-based novel single-phase PFC. The hybridconduction mode is employed, the size of boost inductance is greatly reduced, and the power density is improved; a single-period control strategy is used for controlling, the hybrid conduction mode-based novel single-phase PFC has the advantages of a favorable control effect ,more rapid response speed, rapid and accurate load adjustment, high interference-resistant capability, simple control ruleand the like and is easy to implement, and network-side current sine, unit power factor and DC-side voltage constant are achieved.
Owner:CHINA THREE GORGES UNIV
A common-mode voltage suppression method suitable for matrix converter
ActiveCN103780100BReduced execution timeReduce current harmonic contentConversion without intermediate conversion to dcVoltage amplitudeMatrix converters
The invention discloses a common-mode-voltage inhibiting method applicable to a matrix converter. An effective vector of the matrix convertor is selected according to a traditional double-voltage modulation method. A pair of large vectors with maximum amplitudes and a pair of intermediate vectors with intermediate vectors on adjacent directions of the effective vector are used to form opposite vectors which are used to substitute a zero vector in a traditional double-voltage modulation method so that an output line voltage is synthesized. A modulation functional expression is constructed on the basis of the traditional double-voltage modulation method so that control demands of input current and output voltage of the matrix converter are met and at the same time, a common-mode voltage amplitude is reduced effectively and it is also ensured that only two ideal switches change when ideal switches of the same output phase are switched. It is proved by experiments that the common-mode-voltage inhibiting method applicable to the matrix converter is capable of reducing a common-mode voltage to 57.7% of an input power-supply amplitude and at the same time, harmonic content of input current and output current is less than that of a current frequently-used optimization zero-vector modulation position method.
Owner:TIANJIN UNIV
Three-phase three-level high-frequency chain matrix rectifier topology and its modulation method
ActiveCN109980966BLarge output capacityIncrease the output voltageAc-dc conversion without reversalAc-ac conversionCapacitanceClamp capacitor
The invention discloses a three-phase three-level high-frequency link matrix rectifier topology and a modulation method thereof, and relates to the field of topology and modulation of electronic powerinverters. The three-phase three-level high-frequency link matrix rectifier topology comprises a three-phase three-level matrix inverter of which the input terminal is electrically connected with a power network and the output terminal is electrically connected with the primary side of a transformer; each phase of the three-phase three-level matrix inverter comprises four groups of two-way switchunits that are common-emitter series-opposition structures; and the three-phase three-level matrix inverter is also provided with a three-level structure in which a neutral point clamped diode and aneutral point clamped capacitor are replaced with two-way switch units respectively. From the view of circuit topology, the three-phase three-level high-frequency link matrix rectifier topology has advantages of large output capacity, high output voltage, low current harmonic content and the like by introducing more switch tubes. By adopting the decoupled and coupled dual-carrier SPWM modulation method, the voltage-withstanding level of components is beneficially reduced, the unit power factor in the grid side is realized, and the content of low-order harmonics of the input current is reduced.
Owner:YANSHAN UNIV
Concentrated direct-current power supply skid-mounted electric automobile charging house
ActiveCN101976877BEasy to cleanDoes not affect power qualityBatteries circuit arrangementsSwitchgear arrangementsPower qualityLow voltage
Owner:NANCAL ENERGY SAVING TECH +1
A common-mode voltage suppression method for dual inverters based on 60-degree coordinate system
The invention discloses a common-mode voltage suppression method based on a 60-degree coordinate system open-winding dual-inverter space vector modulation, which achieves the effect of common-mode voltage suppression by changing the duty cycle of a specific vector combination. In this method, every time the switching state is changed, the switching tube only changes once and the mutual difference of the common-mode voltage generated by adjacent switching sequences is the minimum value of the generated common-mode voltage value, which reduces the switching frequency of the system and reduces the current and torque ripple. , to achieve the effect of dynamic common-mode voltage suppression, which essentially solves the problems of common-mode voltage in the open-winding dual-inverter topology, and reduces the current harmonic content and torque ripple when the permanent magnet motor is running.
Owner:SOUTHEAST UNIV
Opening-winding permanent-magnet synchronous motor driving system for mine traction and working method thereof
ActiveCN108696204AIncrease starting torqueImprove startup characteristicsAC motor controlElectric motor controlSynchronous motorDrive motor
The invention provides an opening-winding permanent-magnet synchronous motor driving system for mine traction and a working method thereof. The driving system is composed of a first power supply circuit connected with a three-phase voltage, a second power supply circuit connected with the three-phase voltage, a permanent-magnet motor connected with the first power supply circuit and the second power supply circuit, a sampling module connected with the permanent-magnet motor, a main control module connected with the sampling module, and a driving module connected with the main control module, the first power supply circuit and the second power supply circuit. The driving system has the following beneficial effects: the neutral point of the permanent-magnet synchronous motor is opened to form a winding opening structure with dual ports; the opening-winding permanent-magnet synchronous motor is used as a driving motor of the mining electric locomotive, so that the requirement of the largestarting torque is met and the starting characteristic of the driving system is improved; and two converters are connected to the two ends of the opening-winding permanent-magnet synchronous motor, so that the system stability is improved and the fault rate is reduced.
Owner:SHANGHAI JIAO TONG UNIV
A three-phase isolated step-down PFC rectifier control method
ActiveCN108923671BHigh densitySimple structureEfficient power electronics conversionAc-dc conversionPower factorHarmonics
The invention relates to the technical field of power electronic converters, in particular to a three-phase isolated buck-mode PFC rectifier and a control method thereof. The three-phase isolated buck-mode PFC rectifier comprises a three-phase rectifier bridge unit and a switch array unit, wherein the three-phase rectifier bridge unit comprises three rectifier bridge arms, and each rectifier bridge arm comprises an upper diode and a lower diode separately; and the switch array unit comprises a high-frequency switch group and three bidirectional switch groups, the high-frequency switch group iscomposed of a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are connected in series, and the three bidirectional switch groups comprise a first bidirectional switch group, a second bidirectional switch group and a third bidirectional switch group. According to the three-phase isolated buck-mode PFC rectifier and the control method thereof, the whole system structure can be simpler, the efficiency is improved, the three-phase isolated buck-mode PFC rectifier has the advantages of high power factor, low current harmonic content, high power supply density and high efficiency and can be widely applied to occasions where three-phase power supply with higher power density requirements are supplied.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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