47 results about "Three phase rectifier" patented technology

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

The invention discloses a multi-line electric energy quality management and power flow transfer device and a control method, the device comprises a first regulation and control module, a second regulation and control module and a shared direct current bus, and the first regulation and control module and the second regulation and control module are of a vertically symmetrical structure; the two regulation and control modules are the same in structure, a primary winding of a three-winding transformer is connected with a medium-voltage alternating-current bus, a wire outlet end of a first secondary winding of the three-winding transformer is connected with a first load through a secondary winding of a first series transformer which is connected in series, and a primary winding of the first series transformer is connected with an alternating-current end of a first three-phase inverter; a wire outlet end of a second secondary winding of the three-winding transformer is connected with an alternating current end of the three-phase rectifier; the medium-voltage alternating-current bus is connected with a second load through a secondary winding of a second series transformer which is connected in series, and a primary winding of the second series transformer is connected with the alternating-current end of the second three-phase inverter. According to the invention, the increasingly complicated power quality requirements under multiple working conditions in the power distribution network facing multi-feeder decoupling regulation and control and mutual assistance are met.

The invention discloses a three-phase PWM rectifier model prediction algorithm of a cascade positive sequence component extractor, and relates to the technical field of power electronics, the algorithm comprises the following steps: sampling a DC side, a power grid phase voltage and an inductive current, and processing through a PI controller to obtain an inductive current reference amplitude; extracting a positive-sequence component by using Clark transformation and a specific filter, and combining the positive-sequence component with the reference amplitude to obtain a new inductive current reference value; a voltage equation is determined and discretized according to the Kirchhoff's law, a cost function is designed to optimize and determine voltage vectors, and three specific voltage vectors are selected to calculate action time and optimize sub-sectors to construct a double-loop control structure. Finally, when the power grid is unbalanced and harmonic waves exist, the algorithm is compared with a traditional method in a simulation mode; by setting related parameters, simulation models of the two methods are built respectively, indexes such as current waveform, voltage fluctuation and power factors are recorded, and the effectiveness of the algorithm in disturbance suppression and current tracking is verified through comparative analysis.

A DFIG wind power facility configured to be operated during grid faults is provided. The wind power facility includes a Doubly-Fed Induction Generator, a control system, an electric converter, a short-circuit controlled switch to selectively short-circuit the stator and a Stator Neutral Brake Chopper coupled to the stator. The DFIG includes a rotor and a stator, the stator including at least one three-phase winding. The electric converter includes a Machine Side Converter, a Grid Side Converter and a DC link connected therebetween. The SNBC includes a three-phase rectifier including three inputs, an impedance and an active high-frequency switch configured to vary the average value of the impedance by adjusting its duty cycle; each of the three inputs of the rectifier is connected to a phase of the at least one three-phase winding of the stator. Methods for operating a DFIG wind power facility during grid faults are also provided.

A kind of multi-line power quality treatment and power flow transfer device and control method, the device includes first regulating module, second regulating module and shared DC bus, first regulating module and second regulating module present upper and lower symmetrical structure;Two regulating module structures are same, and all are three-winding transformer primary winding and medium voltage AC bus connection, the first secondary winding of three-winding transformer is connected with first load through the secondary winding of first series transformer connected in series, the primary winding of first series transformer is connected with the AC end of first three-phase inverter;The AC end of three-phase rectifier is connected with the secondary winding of three-winding transformer;Medium voltage AC bus is connected with second load through the secondary winding of second series transformer connected in series, the primary winding of second series transformer is connected with the AC end of second three-phase inverter.The present application solves the increasingly complex power quality demand of decoupling regulation and mutual aid, multi-working condition in distribution network facing multi-feed line.

The application provides a non-continuous three-phase rectifier adjustable power decoupling method, and relates to the field of power electronics. The method is characterized in that a capacitor equivalent circuit is connected in parallel to the DC side of a three-phase PWM rectifier, the capacitor equivalent circuit is composed of a first capacitor connected in series with an active negative capacitor circuit, and a digital signal controller is used to sample the relevant voltage and current signals of the AC side and the DC side, and the active negative capacitor capacitance is adjusted by controlling the switching tube, so that the equivalent capacitor circuit can be flexibly adjusted. The application does not require an additional DC power supply, the capacitance and inductance of the passive device used are small, and the volume advantage is significant. The closed-loop control has high precision and equivalent inhibition effect as the traditional large capacitor. The equivalent capacitance is adjusted only by software, the external physical structure does not need to be changed, and the adjustment range is wide. The preset DC side voltage fluctuation amplitude can be calculated and adjusted automatically, different unbalanced working conditions can be adapted, the fluctuation suppression demand can be met, different working modes can be switched according to the AC side working condition, and the application is not continuously operated, so that the switching loss is lower.

The application discloses a parallel power supply current estimation method based on an instantaneous power integration method and relates to the technical field of power electronics and power supply control. The method collects electrical signals on the AC side of a three-phase PWM rectifier in front of each power supply module, calculates the instantaneous power input of the module, and integrates the input power and the voltage on the load side with the switching period of a DC-DC converter in back as an integration window to obtain the single-period energy and voltage integration value, so as to weaken the influence of the energy of energy storage elements such as inductors and capacitors in the circuit on the estimation result, thereby obtaining the preliminary estimation value of the output current of the module. Meanwhile, an independent equivalent loss resistor is introduced for each power supply module to describe the loss in the power supply, and the equivalent loss resistor is estimated in a longer time scale through an offline polling mode, so as to obtain the output current estimation result of each parallel power supply module.

The application discloses a kind of three-phase rectifier multiple switch tube open-circuit fault diagnosis methods based on voltage deviation, belong to power electronic converter fault diagnosis technical field.Method includes: obtaining relevant signal for diagnosis;According to three-phase voltage, three-phase current, three-phase inductance value, three-phase equivalent resistance value and switching period, the actual value of three-phase line voltage is calculated;According to DC voltage and the duty cycle of switch tube on three-phase bridge arm, the expected value of three-phase line voltage is calculated;Difference is obtained between the expected value and actual value of three-phase line voltage;The deviation value of three-phase line voltage is compared with first preset threshold and second preset threshold, to determine the polarity of the deviation value of three-phase line voltage;Wherein, first preset threshold is less than second preset threshold;The polarity of the deviation value of three-phase line voltage is combined with voltage phase, to determine fault switch tube.The application can quickly diagnose for various situations of multiple switch tube fault, including single switch fault, two switch tubes in succession fault, two switch tubes simultaneous fault.

The invention discloses a three-phase voltage type PWM rectifier switch tube open-circuit fault diagnosis method, which comprises the steps of 1, implementing three-layer wavelet decomposition on an input side three-phase current historical database after a three-phase voltage type PWM rectifier power switch tube open-circuit fault by adopting a wavelet decomposition method, extracting a characteristic value corresponding to the switch tube fault and finishing normalization; and 2, performing parameter optimization on the support vector machine through an improved mouse group search algorithm, and determining an optimal penalty factor and a kernel parameter so as to carry out data training and fault diagnosis. The invention aims to analyze the waveform distortion condition of the three-phase current at the input side after the open-circuit fault of the three-phase rectifier switch tube, so as to optimize the fault characteristic quantity and realize the accurate diagnosis of the open-circuit fault of the power switch tube. According to the invention, the fault identification capability of the rectifier system under the abnormal working condition can be effectively improved, so that safe and stable operation of power electronic equipment is ensured.

The present invention provides a wave energy power generation hydraulic PTO constant speed and pressure control method based on dual parameter joint adjustment, the method comprising: collecting the system oil pressure signal p of the main oil circuit through a pressure transmitter, and sending the oil pressure signal p to the oil pressure closed loop regulation module; measuring the torque signal M of the input shaft of the three-phase permanent magnet synchronous generator through a speed torque meter; g and speed signal n, and the signal M g and n are sent to the oil pressure open-loop regulation module, and the signal n is sent to the oil pressure closed-loop regulation module; the electromagnetic torque of the three-phase permanent magnet synchronous generator is controlled by the three-phase PWM rectifier to indirectly adjust the speed n; the three-phase current signal i at the outlet of the three-phase permanent magnet synchronous generator is collected by the generator vector controller a i b i c , and output SVPWM signal to the three-phase PWM rectifier, while receiving the speed signal n and setting speed n r The present invention has good speed stabilization and pressure stabilization effects.

A three phase rectifier includes n converter modules in each phase A, B, and C, wherein the AC inputs of the n converter modules of each phase are connected together in parallel, and the DC outputs of respective first to nth converter modules of phases A, B, and C are connected together in parallel as first to nth sub-combinations of DC outputs. The first to nth sub-combinations of DC outputs may be connected together in selected modes to produce a range of total output DC voltage, wherein the range of total output DC voltage is substantially free of double line frequency ripple and the converter modules are implemented without electrolytic output capacitors. The three phase rectifier is suitable for use in high power applications such as electric vehicle fast chargers.

The application provides a kind of hybrid vector variable frequency control method based on three-phase rectifier, it is related to power electronic electric energy conversion technical field;Current three-phase PWM rectification technology is important front-stage equipment, and the current of switch tube is large, and the loss of switch tube is composed of turn-on loss and conduction loss, and conduction loss cannot be avoided in high-power state, and switch loss is related to frequency, if switch tube loss is not controlled, switch tube loss will accumulate in the form of heat, when temperature exceeds the limit of switch tube, it often causes irreversible damage to switch tube, therefore, on the basis of considering the power quality of DC side, the action frequency of switch tube of three-phase PWM rectifier is dynamically controlled to realize the continuous operation of three-phase PWM system under high power, and the method considers the stability of DC side voltage and the temperature characteristics of IGBT to carry out frequency modulation.

The present invention relates to a deadbeat control method with delay compensation for a three-phase rectifier, comprising the following steps: (1) performing closed-loop control on the three-phase rectifier using deadbeat control to achieve closed-loop control of DC voltage and AC current; (2) sampling k The three-phase grid voltage, three-phase current and DC side voltage at the moment; (3) The vector angle extrapolation method and current prediction calculation formula are used to obtain k +1 time three-phase grid voltage and three-phase current; (4) k Substitute the state variables at time +1 into the current prediction calculation formula and solve k +1 time, and convert it into a drive signal, that is, k Time output k The voltage value at the +1 moment is k +1 time converter to obtain k The method is beneficial to reduce the delay on the deadbeat control of the rectifier and improve the comprehensive performance of the rectifier.

The invention relates to a control method and device for measuring and calculating the stability of a double-end flexible interconnection system, and the method comprises the steps: enabling a load converter to be equivalent to a constant-power load based on a large-signal averaging model of a three-phase PWM rectifier with a load, and estimating the stability boundary of the three-phase PWM rectifier with the constant-power load; applying a disturbance signal within the stable boundary, sampling the output side voltage and current of the three-phase PWM rectifier, and making a difference between the output side voltage and an output reference voltage, and taking the difference as a voltage drop on an output equivalent resistor of a Buck Boost system port; the voltage drop is sent to an impedance simulation link, and a Buck Boost system port output current reference instruction value is obtained; the difference value between the current reference instruction value and the output side current is sent to a current loop controller for closed-loop control, and the duty ratio change of the Buck Boost system is obtained; and the duty ratio change of the Buck Boost system is compared with the sawtooth wave of the modulation module, and a switching signal of the power device is generated according to the comparison result. According to the invention, a better stability measuring and calculating mode can be realized.

The invention relates to the technical field of power systems, and provides a negative sequence and reactive power comprehensive compensation treatment system and method.The system comprises a three-phase step-down transformer, a single-phase transformer, a single-phase transformer, a three-phase rectifier, a single-phase inverter and a single-phase inverter; the three-phase step-down transformer is a three-phase double-winding step-down transformer; the single-phase transformer is a single-phase double-winding boosting transformer; the single-phase transformer is a single-phase double-winding boosting transformer; the three-phase rectifier is composed of a connection reactor, a DC support capacitor, a DC bus and a three-phase voltage source converter. The single-phase inverter is composed of a direct-current supporting capacitor, a direct-current bus and a single-phase voltage source converter composed of four sets of turn-off devices. The single-phase inverter is composed of a direct-current supporting capacitor, a direct-current bus and a single-phase voltage source converter composed of four sets of turn-off devices. The method can adapt to various locomotive load combinations of the two power supply arms of the traction station, and the negative sequence of the wire inlet side of the traction station can be effectively treated under various working conditions.

This invention relates to a method for suppressing DC voltage ripple in a high-gain proportional resonant PWM rectifier, belonging to the field of rectifier control technology in power electronics. In existing technologies, when the three-phase voltage and current sampling of a three-phase PWM rectifier is inaccurate, the secondary ripple in the DC bus voltage and the harmonics of the grid-side current cannot be effectively suppressed. The method proposed in this invention establishes a transfer function between the negative-sequence current and the secondary ripple of the DC voltage based on the power conservation relationship between the AC and DC sides. It adjusts the negative-sequence current through negative feedback of the secondary ripple of the DC voltage to achieve voltage ripple suppression. Using the method described in this invention, rapid and accurate suppression of the secondary ripple of the DC voltage and the harmonics of the grid-side current can be achieved, avoiding reliance on mathematical models and complex calculations. It is not affected by sampling errors and inaccurate system parameters, and exhibits better robustness to system parameters and sampling accuracy.

The application particularly relates to a control method and system of a three-phase rectifier, and belongs to the technical field of power electronic rectifier control. The application determines the maximum amplitude phase voltage of three-phase voltage amplitudes by acquiring the three-phase voltage input of the three-phase rectifier, reconstructs the voltage into two-phase voltage with the same maximum amplitude phase voltage and keeps the phase unchanged under the shaft, converts the reconstructed two-phase voltage under the shaft into three-phase reconstructed voltage, balances and adjusts the three-phase reference current on the alternating current side based on the reconstructed three-phase voltage, obtains the approximately balanced three-phase reference current, improves the voltage imbalance state, carries out current loop control to determine the control signal of the three-phase rectifier and control the three-phase rectifier, makes the direct current side stably output the expected voltage under the input unbalanced phase voltage working condition, and improves the performance and stability of the three-phase rectifier.

Embodiments of the present application provide a modulation wave generation method, device, system, equipment, medium and product. The method comprises: receiving an intermediate voltage under three phases output by a three-phase rectifier; if the input source is a three-phase four-wire system, taking the intermediate voltage under each phase as the modulation wave of the phase; if the input source is a three-phase three-wire system, determining a harmonic component according to the intermediate voltage under three phases, and determining the modulation wave of the phase based on the harmonic component and the intermediate voltage under each phase. When the three-phase four-wire system input source is converted, the sinusoidal pulse width modulation can be directly based on the intermediate voltage under each phase. When the three-phase three-wire system input source is converted, the modulation wave equivalent to the space vector pulse width modulation can be obtained after the harmonic component injection on the intermediate voltage under each phase, and the pulse width modulation can also be realized, thereby improving the compatibility of the rectifier.

The invention provides a control method and device for a three-phase PWM (Pulse Width Modulation) rectifier, electronic equipment and a storage medium. The control method comprises the following steps of obtaining a line current # imgabs0 # in the three-phase PWM rectifier, and obtaining voltages # imgabs1 # of ac sides of all converters; obtaining a reference voltage vector # imgabs4 # based on the line current # imgabs2 # and the voltage # imgabs3 #, and obtaining flux linkage errors # imgabs7 # of all converters based on the line current # imgabs5 # and the voltage # imgabs6 #; and based on the reference voltage vector # imgabs8 # and the flux linkage error # imgabs9 #, the duty ratios of all converters are adjusted. According to the control method, the three-phase PWM rectifier can be controlled.

The invention provides a single-cycle control three-phase VIENNA rectifier power factor correction method and device, and belongs to the technical field of rectifiers, and the method comprises the steps: obtaining three-phase input current sampling signals ia, ib and ic; acquiring a bus voltage sampling signal Upfc and a bus voltage loop output sampling signal Vm; acquiring a voltage difference UNO between the three-phase input N line or the virtual N line and the midpoint O of the BUS capacitor; and according to the three-phase input current sampling signal, the bus voltage sampling signal, the bus voltage loop output sampling signal and the voltage difference, calculating the duty ratio of each phase of full-control switch tube. By indirectly or directly detecting the voltage difference between a three-phase input N line or a virtual N line and a BUS capacitor midpoint and introducing the voltage difference into a single-cycle control loop, decoupling control in a three-phase VIENNA single-cycle control technology is realized, so that total harmonic distortion (THD) in a full-load range is remarkably reduced, and a power factor (PF) index is improved.

The utility model relates to the technical field of rectifiers, in particular to a three-phase rectifier with low ripple waves and a wide output voltage range. The utility model discloses a three-phase rectifier based on low ripple and a wide output voltage range. The three-phase rectifier comprises an AC voltage source module, a Y-type rectification module, an interleaved Boost module, an MOSFET control module, a Boost control module and a load. The DC / DC converter has the characteristics of low ripple and wide output voltage range output, and is very wide in application prospect. Compared with the traditional rectifier, the Y-shaped rectifier structure is adopted, and wide-range voltage output is obtained, so that the rectifier has better performance in the field of electric automobiles, the rectifier can be compatible with voltage levels of various nominal batteries, meanwhile, ripples of output current are reduced through interleaving Boost modules in parallel, and the output current is more stable. And the output waveform is smoother, the ripple is smaller, and the device is safer, more stable and more practical and has a very wide application prospect.

The invention provides a control method of a three-phase rectifier and a power conversion module, and relates to the technical field of rectifiers. The control method comprises the following steps: determining a three-phase sinusoidal current reference signal according to the input voltage of a three-phase rectifier, the voltage of a first capacitor of a direct current bus and the voltage of a second capacitor of the direct current bus; determining a common-mode signal according to the voltage of the first capacitor and the voltage of the second capacitor; according to the sinusoidal current reference signal, the carrier signal and the common-mode signal of any phase in the three-phase sinusoidal current reference signals and the input current of the corresponding phase, a gate signal of the corresponding phase is determined, and the gate signal of the corresponding phase is used for controlling the switch-on or switch-off of the switch unit of the corresponding phase. According to the invention, when the voltage of the power grid is distorted or unbalanced, the operand required for control and the control difficulty of the rectifier can be reduced.

The present invention designs a method for suppressing the DC bus voltage ripple of a three-phase PWM rectifier by three-dimensional negative-sequence current reconstruction. The present invention belongs to the field of rectifier control technology in power electronics. In the prior art, when the grid-side parameters of a three-phase PWM rectifier cannot be accurately obtained, the suppression performance of grid-side current harmonics and DC bus voltage ripple will decline. The method described in the present invention is based on a three-dimensional space cone model of negative-sequence active and reactive currents and the amplitude of the DC bus voltage ripple. By controlling the change of negative-sequence current, the amplitude data of the DC bus voltage ripple is collected, and the negative-sequence current coordinates at the cone vertex are reconstructed. By using the method described in the present invention, the DC bus voltage ripple and grid-side current harmonics can be effectively suppressed, and parameters such as grid-side voltage and inductance are not required, and it has good robustness.

Disclosed in the present invention is a single-phase and three-phase compatible onboard charger, comprising an AC power supply input end, an EMC filter device, a three-phase rectifier, a controller, a first switch K 1 connected in series between the EMC filter device and an AC power supply, and a second switch K 2 connected in series between the EMC filter device and the three-phase rectifier. The present invention controls the opening and closing of the two switches, thereby achieving the single-phase and three-phase compatible operation. In addition, a unified filter circuit is used during the single-phase and three-phase operation, thereby reducing the number of filter devices and the number of switching devices, and further reducing the size and cost of a system. In the present invention, the working principle of a circuit is simple, the cost of controlling the system is low, and the single-phase and three-phase compatible operation is achieved simply by means of switching of relay switches; moreover, the design of an input filter is simplified, and the same filter device is used during the single-phase and three-phase operation, without adding an additional component, thereby reducing the cost and size of the system.

The invention discloses an inter-line power flow transfer topology and method considering photovoltaic output, and the topology comprises two three-phase rectifiers, a common DC bus, two distributed photovoltaics and three three-phase inverters, the two rectifiers are respectively connected with two low-voltage AC feeder lines in parallel, and are used as the input ends of a first transfer path; the two inverters which are respectively connected in series with the two low-voltage alternating-current feeder lines through the series transformers are used as the output end of the first transfer path, the inverter which is connected in series between the two low-voltage alternating-current feeder lines is used as the channel of the second transfer path, and the two distributed photovoltaics cooperate with the two alternating-current power supplies to provide output for power flow transfer and line loads. According to the invention, five three-phase current converters are used and a direct current bus is reserved, so that the power flow direction and the transfer power can be controlled through the current converters.

This invention discloses a control method for a Vienna rectifier topology based on SiC power devices. First, a mathematical model of a three-phase Vienna rectifier is established; then, the expressions for the Vienna rectifier's midpoint voltage and current are derived; an inner current loop is designed; an outer voltage loop is designed; and finally, midpoint potential balance control is performed. This invention can reduce the size of the Vienna rectifier system, improve the power factor, and reduce system losses.

The invention discloses a parallel power supply current estimation method based on an instantaneous power integration method, and relates to the technical field of power electronics and power supply control. According to the method, electric signals of the alternating current side of a preceding-stage three-phase PWM rectifier of each power module are collected, module input instantaneous power is calculated, integration is carried out on the input power and load side voltage by taking the switching period of a backward-stage DC-DC converter as an integration window, and single-period energy and a voltage integration value are obtained; the influence of energy round-trip of energy storage elements such as an inductor and a capacitor in the circuit on an estimation result is weakened, so that a preliminary estimation value of module output current is obtained; meanwhile, an independent equivalent loss resistor is introduced for each power supply module to describe loss in the power supply, setting is carried out in an off-line polling mode, and the equivalent loss resistor is estimated in a longer time scale by an integration method, so that an output current estimation result of each parallel power supply module is obtained.

The invention discloses a PWM rectifier fixed frequency prediction control method and system under three-phase imbalance, and relates to the technical field of power electronic control, and the method comprises the steps: building a three-phase PWM rectifier current prediction model under the three-phase imbalance state; predicting the active power of the next control period and the dynamic change of the d-axis positive-negative sequence current and the q-axis positive-negative sequence current based on the prediction model; based on the dynamic change, constructing a combined value function containing d-axis and q-axis positive and negative sequence current errors and active power errors, and obtaining an optimal modulation action time distribution strategy by minimizing the combined value function; generating a control signal according to an optimization result by adopting a space vector pulse width modulation technology; according to the method, independent adjustment of positive and negative sequence current is effectively realized by comprehensively considering a value function which takes d and q axis positive and negative sequence current errors and active power errors as targets under the condition of three-phase power grid voltage imbalance, and high-precision tracking and optimal scheduling of the active power of the system are ensured.

The invention relates to a three-phase staggered output series isolated single-stage AC-DC converter and a control method and device thereof.The converter comprises a three-phase PWM rectifier and a three-phase resonance module connected with the three-phase input end of the three-phase PWM rectifier, and the input end of each phase of the three-phase PWM rectifier is connected with the input end of the corresponding phase of a power grid; the three-phase PWM rectifier comprises a three-phase bridge type structure; the output ends of the resonance modules of all phases are connected in series and then connected with a load, so that low-frequency ripple vectors of voltage ripples output by the three-phase resonance modules are superposed and counteracted, and low-frequency ripples of total output voltage output by the three-phase resonance modules to the load are eliminated. According to the converter, the output ends of the resonance modules of all phases are connected in series, so that vectors of low-frequency ripples in the total output end of the converter are superposed and counteracted, and the low-frequency ripples of the total output voltage of the converter are eliminated; through the three-phase PWM rectifier, the converter has the advantages of low switching loss, high power density and low manufacturing cost.

A compatible boost and step-down control three-phase PFC rectifier circuit and control method, the circuit includes input filter circuit, power switch circuit, output filter circuit and control circuit, through the implementation of the application, the bridge arm reverse connection MOS replaces the conventional rectifier bridge arm single MOS, the filter inductance is added to the input and output end of the rectifier, so that the circuit has lower starting current and reliable short circuit current suppression capacity; combined with the new control method, the problem that the three-phase PFC rectifier can only be boost control or step-down control in the prior art is solved, so that the rectifier can realize a wider input voltage range, realize high power power factor quality of the power supply; when the bridge arm MOS is turned off, the input and output are isolated, there is no current path, when the upper and lower bridge arms of the same phase are directly connected, the rectifier will not be damaged, has lower starting current and reliable short circuit current suppression capacity.