6006results about "Power conversion systems" patented technology

The invention relates to the technical field of resonance suppression, and discloses an active damping control LC resonance suppression method and device. The method comprises the following steps: performing parameter identification processing based on bus voltage to obtain an inductance value, a capacitance value and a resonance frequency of an LC circuit; extracting a resonant current component of the current signal based on the resonant frequency; calculating damping power according to the resonance current component, and converting the damping power into a voltage compensation instruction under an alpha-beta coordinate system; generating a PWM control signal according to the voltage compensation instruction and a voltage reference instruction; and performing on-off control on the inverter based on the PWM control signal, and injecting power opposite to the resonant current component into the LC circuit to generate a virtual damping effect. Virtual impedance characteristics are seamlessly integrated into inverter control, rapid response of the whole process from resonance detection to power injection is ensured, the resonance peak value is effectively suppressed, and the current quality is improved.

The invention relates to an electrical / electronic component (10) for a motor vehicle, comprising a housing (12) enclosing a receiving space (14), at least one electrical or electronic component (16) which is received in the receiving space (14), a heat conducting element (18) which is arranged on a surface of the component (16) to be cooled and is designed to conduct heat away from the component (16), and a coolant guide device (20) which is configured to guide a dielectric coolant (22) to the heat conducting element (18), whereby the heat conducting element (18) can be exposed to and surrounded by the coolant (22), whereby heat can be transferred from the heat conducting element (18) to the coolant (22).

The invention provides a device for inhibiting drain-source overvoltage and overcurrent through active gate drive of a silicon carbide MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor), aiming at solving the problem of voltage or current overshoot caused by circuit parasitic parameters in a high-speed switching process of the SiC MOSFET and simultaneously considering the switching speed and energy loss balance. According to the device, drain-source voltage vdc and direct-current bus voltage of the SiC MOSFET are collected to serve as feedback signals, and gate driving voltage and equivalent gate resistance are dynamically adjusted; in a key stage (a Miller plateau switching-on period and a voltage rising period switching-off period) of a switch transient state, a gate resistance network is switched through a logic control circuit, and suppression of drain current overshoot and drain-source voltage overshoot is realized. Simulation verification shows that the device can reduce voltage overshoot by 20%-30% and current overshoot by 25%-60%, only a single voltage feedback channel is needed, the cost is obviously lower than that of a traditional multi-signal acquisition active gate driving scheme, and the device is suitable for a high-efficiency SiC MOSFET power converter.

The invention provides a general electromechanical transient modeling method and system for a network-building converter, and relates to the technical field of electromechanical transient modeling, and the method comprises the steps: simplifying the electromagnetic transient models of network-building converters of different topologies into a grid-connected equivalent circuit of an electromechanical transient time scale; uniformly representing by using an internal potential series reactance model controlled by a power outer ring so as to establish an electromechanical transient general grid-connected interface model of the grid-forming converter; combining mathematical transformation of active power control with a reactive power control mode to form a general power outer loop control model of the network construction type converter; through a method based on internal potential reconstruction, reconstructing a new internal potential satisfying a current limiting constraint, and establishing a general current limiting model suitable for a network construction type electromechanical transient model; according to the method, various topological structures, various power outer loop control and various current limiting strategies can be simulated, flexible use of models in large-scale power system simulation is facilitated, and the complexity of model development and maintenance is reduced.

The present disclosure relates to a battery system supporting a plurality of operation modes according to the SoC. To this end, the battery system is characterized by comprising: one or more batteries supporting multiple operation modes for power storage or supply according to the state of charge (SoC); and a controller which determines an operation mode of the batteries among the plurality of operation modes according to the power supply state of a grid and the SoC of the batteries, wherein the batteries include a battery supporting an uninterrupted power supply (UPS) mode at an SoC at or below a first standard.

The invention discloses an inductor heat dissipation installation structure, an integrated heat dissipation inductor structure and a converter, and the structure comprises a liquid cooling radiator which is internally provided with a first liquid cooling flow channel, is suitable for the circulation of a cooling liquid, and is provided with a heat dissipation surface; the liquid cooling radiator is provided with a first interface and a second interface which are communicated with the inlet end and the outlet end of the first liquid cooling flow channel; the inductor shell is defined by the side plates in the circumferential direction and located on the heat dissipation face so as to be matched with the liquid cooling radiator to form a containing cavity suitable for containing the inductor body; a second liquid cooling flow channel is arranged in a side plate of the inductor shell and is suitable for circulating cooling liquid, and a third interface and a fourth interface which are used for forming an inlet end and an outlet end of the second liquid cooling flow channel are formed in the side plate; at least part of the bottom surface of the accommodating cavity is a heat dissipation surface; the first connector communicates with the third connector, and the second connector communicates with the fourth connector. By adopting the inductor heat dissipation mounting structure, the heat dissipation effect of the inductor can be improved.

The invention discloses a new energy automobile wireless power supply soft switching control system based on a segmentation strategy, and particularly relates to the technical field of new energy automobile wireless power supply, and the control system comprises a resonance current zero-cross detection module which detects a resonance current output square wave signal of a resonance network in real time; the segmented control decision module is used for selecting a strong control strategy or a weak control strategy according to a comparison result of the smoothed frequency difference value and a preset threshold value; the segmented control execution module is used for adjusting the inverter driving frequency by adopting a corresponding control algorithm according to the output of the segmented control decision module; according to the new energy automobile wireless power supply soft switching control system based on the segmentation strategy, the segmentation control logic and the model and algorithm of the special module are designed, so that the driving frequency of the new energy automobile is adjusted, and the driving frequency of the new energy automobile is adjusted to be within the preset frequency locking range. And wide-range frequency locking, rapid dynamic correction and high-precision steady-state control are realized.

The embodiment of the invention discloses a power output control device and a carrier. The power output control device comprises a controller, a main switch module, a self-locking loop and an interlocking turn-off module. The output end of the controller is used for providing a first control signal and a second control signal; the main switch module is used for responding to the first control signal and is switched on when the first control signal is a turn-on signal so as to supply power to a load; the self-locking loop is used for feeding back an output signal of the main switch module to the input end of the main switch module after the main switch module is switched on, so as to maintain the switch-on state of the main switch module; and the interlocking turn-off module is used for responding to the first control signal and the second control signal, conducting when the first control signal is a turn-off signal and the second control signal is an unlocking signal, and inputting an output signal of the interlocking turn-off module to the main switch module so as to actively break the self-locking loop, turn off the main switch module and stop supplying power to the load. Through the device, the driving safety is obviously improved.

The invention relates to the technical field of new energy automobile electric control, and discloses a self-adaptive voltage dynamic stability control method for a new energy automobile converter. The method comprises the following steps: acquiring a real-time voltage time sequence data sequence of the new energy automobile converter in an operation period; performing voltage disturbance characteristic analysis on the real-time voltage time sequence data sequence based on a rated voltage interval of the converter, and identifying voltage disturbance modal information of the converter; then, according to an embedded voltage control strategy library and a voltage stability threshold condition, an initial voltage regulation and control instruction sequence is generated in combination with voltage disturbance modal information of the converter; performing voltage change trend prediction on the voltage disturbance modal information of the converter to obtain predicted voltage disturbance modal information; performing voltage control compensation optimization on the initial voltage regulation and control instruction sequence based on the predicted voltage disturbance modal information to generate an optimized voltage regulation and control instruction sequence; and performing adaptive voltage regulation on the new energy automobile converter according to the optimized voltage regulation instruction sequence.

The invention discloses an insulation fault edge self-healing method and device for a power conversion system, and belongs to the technical field of fault diagnosis and automatic maintenance of power electronic equipment, and the method comprises the steps: obtaining multi-modal sensing data, synchronously collected by a multi-modal sensor array, of the power conversion system; a preset lightweight CNN-Transform hybrid model is used to process the multi-modal sensing data, and a feature vector of each modal is obtained; fusing each modal feature vector by adopting a dynamic weight attention mechanism to obtain a fused fault feature vector; classifying the fused fault feature vectors based on a fault classifier, and determining a fault level; and according to the determined fault level, sending a corresponding control instruction to an execution mechanism, and triggering a hierarchical self-healing action. According to the invention, fault identification and self-healing decision can be rapidly completed, and the accuracy of fault detection is effectively improved.

The invention provides a voltage stability control method for a multi-output switching power supply, which comprises the following steps of: sampling a main output channel in real time to obtain a voltage signal; the voltage signal is processed through a wide bandwidth error amplifier, a main channel adjusting signal is generated, and the main channel adjusting signal is used for driving a main power switch device; receiving an input voltage fluctuation frequency band of an auxiliary channel, a load current transient change gradient and a frequency spectrum coupling characteristic of a main channel adjusting signal through a dynamic prediction model, and generating an auxiliary channel adjusting signal with a phase lead compensation characteristic; a cross coupling active offset mechanism is constructed, time domain-frequency domain characteristics of coupling interference are extracted through a high-precision differential detection circuit, amplitude-frequency adjustable reverse correction signals are generated in real time through an adaptive compensation algorithm and injected into control nodes of an auxiliary output channel, and dynamic decoupling and ripple suppression are carried out. According to the method, high-stability control of multi-channel voltage under all working conditions is realized, and the dynamic response speed and the anti-interference capability are improved.

The invention relates to the technical field of voltage control, and discloses an ESC voltage regulator voltage control method and system based on fuzzy adaptive PID, and the method comprises the steps: collecting the output voltage of an ESC voltage regulator and a preset target voltage in real time, calculating a voltage error and an error change rate after filtering, and carrying out the calculation of the error change rate; dividing fast tracking, precise adjustment and anti-interference stability maintenance stages according to errors and change rates and generating control signals, calling corresponding fuzzy rule subsets to deduce proportional, integral and differential gain adjustment amounts, generating real-time gains in combination with initial PID parameters, calculating control amounts by using position type PID based on the real-time gains, converting the control amounts into signals to drive power switch tubes, and controlling the power switch tubes. And closed-loop adjustment is formed. According to the method, the problem that a traditional control method is poor in performance under multiple working conditions is solved, cooperative control over rapid tracking, precise adjustment and anti-interference stability maintenance of the output voltage of the ESC voltage regulator is achieved, it is ensured that the ESC voltage regulator can output stable voltage under the working conditions of starting, steady-state operation and load sudden change, and the requirement for high voltage control precision and dynamic response is met.

The invention relates to the field of digital power supply control, and provides a parameterized digital control method and system suitable for a wide power range charging module, and the method comprises the steps: collecting an original sensor signal, constructing a slow working condition feature vector through adaptive-temperature drift compensation, and driving a physical constraint reference prediction model to generate a second baseline behavior parameter vector; monitoring a gate driving current by using a gate-drain capacitor, extracting a transient characteristic value, and quantifying the transient characteristic value into a ZVS quality factor; the slow working condition feature vector and the ZVS quality factor are fused, a correction vector is generated through an adaptive prediction model, a control parameter vector is generated in combination with a second baseline behavior parameter vector, and online updating is carried out according to feedback; executing hardware physical limit constraint according to the security constraint set, generating security parameters and abnormal flag bits, and writing the security parameters and the abnormal flag bits into a hardware register in a fixed-point manner after cooperating with ZVS quality factor arbitration. According to the method, physical constraint prediction and transient perception correction are fused, and a digital control system considering dynamic response, drift compensation and safety redundancy is constructed.

The utility model provides a power assembly and a converter. The power assembly comprises a machine-side power module, a network-side power module, a positive direct-current bus conducting bar, a negative direct-current bus conducting bar and a direct-current bus capacitor, the machine side power module is connected with a motor, the network side power module is connected with a power grid, and the positive direct current bus conducting bar and the negative direct current bus conducting bar are connected between the machine side power module and the network side power module. The direct current bus capacitor is arranged between the positive direct current bus conducting bar and the negative direct current bus conducting bar; the power assembly further comprises at least one magnetic ring arranged on the positive direct current bus conducting bar and / or the negative direct current bus conducting bar. According to the power assembly and the converter, through the at least one magnetic ring arranged on the positive direct current bus conducting bar and / or the negative direct current bus conducting bar, the ripple current of the bus capacitor is prevented from being too large, the loss of the bus capacitor is reduced, and the bus capacitor is prevented from being burnt.

The invention relates to an energy storage converter and an energy storage system, and relates to the technical field of energy storage. The energy storage converter comprises a box body and a first airflow generating device, the box body comprises a first cavity and a second cavity, the first cavity is communicated with the outside of the box body, at least part of the structure of the first airflow generating device is arranged in the first cavity, and the first airflow generating device is used for enabling airflow to flow into the second cavity from the first cavity. The first airflow generating device is also used for enabling airflow to flow into the first cavity from the second cavity, the second cavity is not directly communicated with the outside of the box body, and the second cavity is indirectly communicated with the outside of the box body through the first cavity. Therefore, a small number of electrical parts with relatively low importance levels can be arranged in the first cavity, and a large number of electrical parts with relatively high importance levels can be arranged in the second cavity. Therefore, most electrical parts with relatively high importance levels in the energy storage converter are not easy to be contacted and damaged by foreign matters outside the box body, and the protection level of the energy storage converter is relatively high.

The invention discloses an electric energy discharge control device. The energy storage circuit is used for storing potential storage electric energy; the bleeder circuit is used for releasing the potential storage electric energy through a bleeder resistor and a bleeder transistor which are connected in series; the reference voltage setting circuit is used for outputting a reference voltage signal; the bleeder sampling feedback circuit is used for outputting a bleeder sampling feedback electric signal according to the bleeder sampling current of the bleeder resistor; the post-stage voltage feedback circuit is used for outputting a post-stage voltage feedback electric signal according to the potential storage voltage; and the conduction degree of the discharge transistor is controlled according to the post-stage voltage feedback electric signal, the reference voltage signal and the discharge current collection feedback electric signal. The conduction degree of the bleeder transistor is dynamically controlled according to the bleeder current collection feedback electric signal and the post-stage voltage feedback electric signal, so that the change of potential storage electric energy of the energy storage device is dynamically adapted, the bleeder power and the current of the bleeder circuit are stable and controllable, and a higher bleeder rate can be realized under the condition that the bleeder power and the current are kept unchanged.

The invention relates to the technical field of satellite power supplies, in particular to a weak light power-on control circuit and processing method for a satellite before satellite-rocket separation, and the circuit comprises a storage battery pack, an autonomous power-on unit, a forced shunting unit and a plurality of solar cell subarrays. The forced shunting unit comprises a forced shunting signal output module and a forced shunting power execution module, and the solar cell sub-array irradiated by weak light before satellite-rocket separation is a target solar cell sub-array; the forced shunting signal output module is arranged at two ends of the storage battery pack and is used for forming a driving voltage of a forced shunting signal through voltage division; and the forced shunting power execution modules are arranged at two ends of the target solar cell sub-array and are used for receiving the forced shunting signals to form a forced shunting loop, performing forced shunting on weak light current formed by the target solar cell sub-array before satellite-rocket separation, and pulling down the driving voltage to disconnect the forced shunting loop after satellite-rocket separation. According to the invention, the weak light current formed by the target solar cell subarray can be forcibly shunted before satellite-rocket separation.

The utility model relates to the technical field of battery management, and discloses an ideal diode circuit and a battery management system, and the ideal diode circuit comprises a current collection module which is connected between the negative electrode of a battery interface and the negative electrode of a charging interface and is used for collecting current; one end of the operational amplifier module is connected between the cathode of the battery interface and the current acquisition module, and the other end of the operational amplifier module is connected between the current acquisition module and the cathode of the charging interface; the input end of the MOS driving module is connected with the operational amplification module and the current acquisition module, and the output end of the MOS driving module is connected with the negative electrode of the charging interface; wherein the operational amplification module amplifies and processes an acquisition signal of the current acquisition module, and controls the MOS driving module to act. By designing the current acquisition module, the operational amplification module and the MOS driving module, after the mode is adopted to replace a power diode, the occupied space is compact, and the overall design cost is low.

The invention discloses a rectifier bridge arm fault identification method and system circuit based on multi-characteristic current waveform analysis, and relates to the technical field of rectifier bridge arm fault identification, and the method comprises the steps: collecting a current signal of an AC input side of a rectifier bridge through a current sensor, and obtaining an original current time domain waveform after filtering conditioning; performing period division on the original current time domain waveform based on a voltage synchronization signal, and outputting a positive half-cycle conduction interval and a negative half-cycle conduction interval in each power frequency period; in each power frequency period, performing square integral operation on the current waveforms of the positive half-cycle conduction interval and the negative half-cycle conduction interval to obtain a positive half-cycle energy value and a negative half-cycle energy value, and calculating an energy unbalance degree; and windowing fast Fourier transform is carried out on the original current time domain waveform, amplitudes and phases of third, fifth and seventh characteristic harmonics are extracted to form a harmonic characteristic vector, the vector is matched with a pre-stored bridge arm fault harmonic fingerprint template, and the matching degree of each fault type is obtained.

The invention provides an electromagnetic interference motor-driven frequency converter control method and system and a medium, and relates to the field of motor control, and the method comprises the steps: collecting an electromagnetic interference signal in real time during the operation of a motor-driven frequency converter, generating interference spectrum data, carrying out the dynamic switching adjustment of the frequency converter, and generating an anti-interference modulation instruction; reconstructing a pulse waveform according to the anti-interference modulation instruction to carry out harmonic compensation, carrying out feedback verification based on the optimized driving signal, carrying out electromagnetic interference judgment according to a motor torque fluctuation value, and generating a judgment result; and triggering a parameter updating instruction based on the judgment result, and driving a frequency converter to perform adaptive control through the parameter updating instruction to generate a frequency conversion control result. The technical problem that a frequency converter control method in the prior art is limited in resistance to electromagnetic interference and affects the running stability of a motor is solved. The technical effects of improving the electromagnetic interference suppression capability and ensuring the stable and reliable operation of the motor are achieved.

Described herein is an electric vehicle charging arrangement for charging an electric vehicle, including an electric vehicle supply equipment (EVSE), where the EVSE includes: a power module configured to provide electrical energy to charge the electric vehicle, an output configured to connect the power module to the electric vehicle for charging the electric vehicle, and a direct current (DC) bus provided between and connected to the power module and the output and configured to transport electric energy from the power module to the output, where the electric vehicle supply equipment includes a pre-charge module configured to pre-charge the output, and where the pre-charge module is separate from the power module and electrically connected to the DC bus.

The invention provides an efficiency optimization control method of a permanent magnet synchronous motor and related equipment. The method comprises the following steps: acquiring an output current of an inverter; constructing an inverter loss model based on the output current of the inverter and the inverter loss coefficient; constructing a total loss model based on the electromagnetic loss model, the inverter loss model and an equivalent conversion method; constructing a current population by taking the plurality of d-axis current values as individuals; and performing optimization solution based on the total loss model, the current population, a PID search algorithm and an artemisinin optimization algorithm to obtain a global optimal solution and control the permanent magnet synchronous motor. According to the scheme, the driver loss is added into the total loss model, and efficiency optimization can be carried out on the whole motor driving system; in order to solve the problem that a traditional method is not suitable for an IPMSM, a PID search algorithm and an artemisinin optimization algorithm are combined, parameter search is carried out on a motor efficiency optimal point by simulating an incremental PID controller adjusting mechanism, a global optimal solution is obtained, and therefore optimal control over the click efficiency is achieved.

The invention provides an energy storage and discharge circuit, and relates to the technical field of energy storage and discharge, and the circuit comprises a power supply input interface, a first current limiting assembly, a first switching device, a first electric control device, a start-stop control transmission device, and an energy storage assembly. The start-stop control transmission device is connected with the control end of the first switching device; a first port of the first switching device is externally connected with a direct-current power supply, and an output end is connected with a control system of the first electric control device; the power supply input interface is connected with an input end of the first current limiting assembly, an output end of the first current limiting assembly is connected with a first port of a controlled system of the first electric control device, and a second port of the controlled system of the first electric control device is connected with a port of the energy storage assembly; according to the invention, the sudden change of the voltage at the two ends of the capacitor when the capacitor is directly subjected to energy storage in the energy storage discharge circuit can be avoided, the capacitor is prevented from being damaged, and the reliability of the energy storage discharge circuit is improved.

The embodiment of the invention provides a gallium nitride totem-pole circuit and a control evaluation system of the gallium nitride totem-pole circuit, and the circuit comprises a gallium nitride power device which comprises an integrated semiconductor tube and an integrated drive circuit; the isolation chip is connected between the control module and an integrated driving circuit of the gallium nitride power device and is used for sending the pulse width modulation signal sent by the control module to the integrated driving circuit, and the isolation chip can ensure the electrical safety of weak current and strong current; the gallium nitride power device is used for controlling the on-off state of the integrated semiconductor tube through the integrated driving circuit according to the pulse width modulation signal sent by the isolation chip; under the condition that the integrated semiconductor tube is conducted, the voltage is output to the control module based on the bus voltage through the integrated semiconductor tube, and the driving circuit is integrated on the gallium nitride power device, so that the circuit design can be simplified, overcurrent protection and undervoltage protection are simultaneously carried out, and the safety of the gallium nitride totem pole circuit is improved.

The utility model discloses an intrinsic safety power supply circuit and a fuel electrochemical oxygen analyzer. The intrinsic safety power supply circuit comprises a first MOS tube, a first capacitor, a second capacitor, a first resistor, a first Schottky diode, a first Zener diode and a second Zener diode, the power supply module of the fuel electrochemical oxygen analyzer comprises the intrinsic safety power supply circuit and further comprises a sensor module, an AD conversion module, a key module, a single chip microcomputer module, an analog output module and a display driving module which are connected with the power supply module, and the single chip microcomputer module is connected with the AD conversion module, the key module, the analog output module and the display driving module. The sensor module is connected with the AD conversion module, and the analog output module is connected with external equipment; the fuel electrochemical oxygen analyzer adopts the intrinsically safe power supply circuit to limit the working current and voltage in the circuit so as to control the power consumption of the whole machine, so that explosion prevention is realized, and the fuel electrochemical oxygen analyzer can measure the oxygen concentration in a flammable and explosive environment.

The utility model provides a pre-charging circuit and an energy storage power supply. The pre-charging circuit comprises a constant current driving module, a pre-charging switch module, a power supply switch module and a voltage conversion module; the constant current driving module is respectively connected with the pre-charging switch module and the photovoltaic power supply, the pre-charging switch module is also connected with the voltage conversion module, and the power supply switch module is respectively connected with the photovoltaic power supply and the voltage conversion module; the constant-current driving module is used for outputting a constant-current signal when the input voltage of the photovoltaic power supply is greater than or equal to a first preset voltage so as to drive the pre-charging switch module to work, so that the photovoltaic power supply pre-charges a capacitor in the voltage conversion module through the pre-charging switch module; the power supply switch module is used for conducting when the voltage of the capacitor is greater than a preset value, so that the photovoltaic power supply supplies power to the voltage conversion module through the power supply switch module. According to the circuit, the surge current at the initial stage of capacitor charging can be reduced, meanwhile, smooth transition from pre-charging to normal power supply can be achieved, and the safety and stability of the circuit are improved.

The invention relates to an on-line monitoring method for the on-off state and abnormal behavior of a synchronous rectification MOSFET of a power system. According to the method, a drain-source voltage VDS signal and a drain current Isd signal of a synchronous rectification MOSFET are collected in the working process of a system, and on-line monitoring is conducted on the on-off state and the abnormal state of the MOSFET. The method specifically comprises the following steps: conducting state monitoring: when VDS is smaller than or equal to a conducting judgment threshold value, judging to be conducted, and otherwise, judging to be turned off; monitoring an oscillation state, and judging switch oscillation when the VDS generates multiple complete oscillations in a set time window; early turn-off monitoring is carried out, early turn-off is judged according to whether I sd is higher than a threshold value or not during turn-off in the DCM mode, and early turn-off is judged according to the current descending trend and zero intersection point deviation in the CCM mode; withstand voltage monitoring: when the VDS transient peak value exceeds the rated withstand voltage or margin of the device, determining that the device is unsafe; and mis-opening monitoring: in the DCM mode, when the VDS is close to the opening threshold value during the logic turn-off period, determining that the mis-opening risk exists. The method can improve the reliability of the power supply system.

The invention relates to a voltage output method and system based on a high-voltage power supply widening controller, and belongs to the technical field of high-voltage power supplies. The method comprises the following steps: acquiring a wide-range voltage parameter, and dividing a frequency control region and a pulse width modulation control region of a high-voltage power supply through an arbitration control algorithm to obtain switching judgment information of a power supply working region; constructing a working area switching logic according to the resistance-capacitance network, executing the working area switching logic through a frequency pulse correlation algorithm, coordinating the pulse width and the working frequency, and generating a double-modulation execution signal; a closed-loop negative feedback mechanism is established, and a wide-range overvoltage-free voltage regulation and control instruction is obtained by combining a proportional-integral compensation circuit with a resistance measurement full-right control working frequency and a pulse width; and broadening the output voltage range and inhibiting the overshoot voltage through power supply power driving, coordinating the working frequency and the pulse width in combination with the wide-range overvoltage-free voltage regulation and control instruction, and outputting the wide-range voltage of the high-voltage power supply.

The invention discloses an adaptive virtual impedance-based fault current limiting method for a network-forming converter, and belongs to the technical field of converter control. Comprising the following steps: collecting grid-side voltage, converter-side voltage and converter output current; carrying out current amplitude calculation on the grid-side voltage quantity to obtain a current effective value of the port of the converter; judging whether the current effective value of the current transformer port exceeds a current threshold value of the current transformer; and if yes, self-adaptive virtual impedance is introduced to carry out converter fault current limitation. The resistance part of the virtual impedance is used for suppressing surge current at the beginning of a fault; and the reactance part is used for suppressing the effective value of the fault transient current within the current limiting range. In the fault process, the current virtual impedance value is adaptively changed according to the effective value of the current overcurrent, and the virtual impedance can be automatically quitted after the fault end stage. The method is suitable for fault current suppression of the network-forming converter in various control modes, and has good feasibility and practical value.

The invention provides a discharge circuit and an energy storage circuit, and relates to the technical field of energy storage discharge, the circuit comprises a slow power-on control unit, an energy storage unit, a start-stop control unit, a first switch device and a first electric control device; the start-stop control unit is connected with the control end of the slow power-on control unit and the control end of the first switch device, a first port of the slow power-on control unit is connected with a first port of the first electric control device, a second port of the slow power-on control unit is connected with the energy storage unit, and a second port of the first electric control device is grounded. The control end of the first electric control device is connected with the output end of the switch unit. According to the invention, only when the start-stop control unit sends the high level signal to the slow power-on control unit and the first switching device, discharging is carried out, the situation that the energy storage equipment is discharged at will is avoided, the situation of circuit damage is reduced, and the reliability of the discharging circuit is improved.