54 results about "Current loop control" patented technology

The invention discloses a servo driver based on a heterogeneous computing architecture, and relates to the field of servo drive control, and the servo driver comprises a first processing unit which is configured to execute an upper-layer control loop and a real-time communication protocol of a servo system; the second processing unit is a heterogeneous processor integrated with a processing system and programmable logic, the processing system is used for executing system management and man-machine interaction tasks, and the programmable logic is configured to realize lower-layer current loop control, pulse width modulation signal generation and hardware acceleration calculation; and the high-speed parallel data interface is connected with the first processing unit and the second processing unit and is used for realizing bidirectional interaction of the control data and the state data. According to the scheme, through collaborative optimization of a heterogeneous computing architecture and a hardware acceleration mechanism, the comprehensive performance of the servo driver is remarkably improved.

The application discloses an inverter grid-connected current harmonic suppression method and system, collects inverter bridge arm current and grid-connected point voltage, carries out operation on the inverter bridge arm current and the grid-connected point voltage to obtain grid-connected current, carries out harmonic suppression on the grid-connected current through a harmonic suppression ring to obtain harmonic suppression ring output value, obtains feedforward value of the grid-connected point voltage and fundamental wave current loop control output value, takes a negative value of the harmonic suppression ring output value and superimposes the feedforward value of the grid-connected point voltage and the fundamental wave current loop control output value, obtains modulation voltage of the inverter, carries out PWM modulation on components of the modulation voltage to generate a switching signal for driving the grid-connected inverter to work. The application estimates the grid-connected current, suppresses specific harmonics in the grid-connected current, makes the grid-connected current harmonic suppression effect better, adopts feedforward on the grid-connected point voltage, makes the inverter have better dynamic performance and stability under strong grid or weak grid, and reduces the grid-connected current harmonic suppression difficulty.

The application discloses a motor system efficiency improving system, device and vehicle permanent magnet synchronous motor. The motor system efficiency improving system comprises a CAN communication transceiving module, a torque coordination module, a variable frequency control module and a motor control module. The application receives instruction information sent by a vehicle controller through the CAN communication transceiving module, analyzes the instruction information, processes the analyzed instruction information through the torque coordination module, obtains target instruction information, processes the target instruction information through the variable frequency control module, obtains frequency information and current loop control parameter information, switches the motor control mode according to the target instruction information through the motor control module, and improves the motor efficiency according to the frequency information and the current loop control parameter information. The application realizes closed-loop control of the motor according to the current loop control parameter information through the motor control module, and improves the motor efficiency according to the frequency information.

This application discloses a current loop control method, related devices, and a permanent magnet synchronous motor (PMSM), relating to the field of motor control. By feeding forward a disturbance voltage characterizing the voltage change caused by parameter variations in the PMSM, an ideal stator current equation is obtained. The transfer function of the PMSM is obtained by combining the vector expressions of stator voltage and stator current in an orthogonal coordinate system. The first current loop transfer function is determined by combining the first controller transfer function. The coefficient values ​​of each control element are determined by tuning the first current loop transfer function. Then, based on the obtained second controller transfer function and the compensation term for the current loop delay, a control voltage calculation model corresponding to the target coordinate axis is determined. The first control voltage is determined based on the control voltage calculation model and fused with the disturbance voltage to obtain the final control voltage. This achieves high-precision current decoupling control of the PMSM, improving control accuracy and efficiency.

The invention provides a control method and a controller of an uninterruptible power supply (UPS), the control method is used for controlling the UPS to switch from a mains supply mode to a battery mode, the control method comprises voltage loop control and current loop control, the voltage loop control provides a current control signal based on the comparison of a bus voltage sampling value and a bus voltage given value of the UPS, and the current loop control provides a current control signal based on the comparison of the bus voltage sampling value and the bus voltage given value of the UPS. The current loop control provides a PWM control signal for operation of the battery mode based on a comparison of a battery current sampling value and a current given value, and the control method comprises the following steps: in a first control period of the current loop control, determining the current given value based on the current control signal and a battery current calculated value, the battery current calculation value is in direct proportion to the inversion output power of the UPS; and determining the current set value only based on the current control signal in a subsequent control period of the current loop control, the current control signal of each control period in the subsequent control period being directly related to the current set value of the previous control period.

The application discloses a single-input multi-output modular multi-port power supply and a control method thereof. The power supply comprises an AC-DC conversion module, a first DC conversion module comprising a plurality of parallel first DC conversion units for providing an output in a four-quadrant operation mode, a second DC conversion module comprising a plurality of parallel second DC conversion units for providing an output in a two-quadrant operation mode, and a third DC conversion module comprising a plurality of parallel third DC conversion units for providing an output in a single-quadrant operation mode. The input ends of the first DC conversion module, the second DC conversion module and the third DC conversion module are connected in parallel to a DC bus at the output end of the AC-DC conversion module. The control method performs collaborative optimization of voltage loop control parameters, current loop control parameters and power distribution coefficients by using a multi-objective evolutionary algorithm. The application effectively improves the flexibility, expandability and stability of the multi-port modular power supply.

The invention relates to a frequency converter control method, a frequency converter, a readable storage medium and a program product. The method comprises the following steps: acquiring a power supply phase current under an alpha-beta coordinate system; determining a power supply phase voltage according to the power supply phase current; acquiring a reference voltage and a bus voltage of the output end of the rectification inverter; performing voltage loop control according to the reference voltage and the bus voltage to obtain voltage loop current; performing power control according to the voltage loop current, the power supply phase voltage and the power supply voltage, and determining a reference phase current; the power supply voltage is determined according to the power supply phase voltage; performing current loop control according to the reference phase current and the power supply phase current to obtain a target phase voltage; the target phase voltage is used for adjusting the voltage output by the rectification inverter. By adopting the method, the voltage control is accurate.

The invention provides a control system and an anti-disturbance method of an electromagnetic bearing, a rotor position outer ring is controlled by a non-singular fast terminal sliding mode controller, external disturbance borne by the system is estimated in real time by introducing a non-linear disturbance observer, and an estimation result is fed back to a position controller for compensation; the input of the position controller is the difference value between the given position and the feedback position of the magnetic bearing rotor, and the output value is the reference value of the current loop control current; a stator coil inner ring is controlled by a nonsingular fast terminal sliding mode controller, input values of the controller comprise a current bias value + a current reference value output by a position ring and a current bias value-a current reference value output by the position ring, and an output quantity is a driving PWM signal duty ratio of a magnetic bearing stator coil; driving the PWM signal to be output to the power amplifier; the power amplifier supplies power to the stator coil; the axial thrust load sudden change anti-disturbance capability can be enhanced, it is ensured that when the thrust load suddenly changes, the magnetic bearing maintains stable suspension of the rotor, and anti-disturbance control is achieved.

This invention discloses a control method for an energy storage inverter coupled to a diesel generator, including a harmonic suppression step, a reactive power compensation step, and a bus adjustment step. The harmonic suppression step includes: dynamically adjusting the proportional control parameters of the current loop control based on the diesel generator voltage, and introducing a filtering module in the feedforward signal processing. The reactive power compensation step includes: actively outputting reactive power compensation based on load characteristics to offset the influence of capacitive loads on the diesel generator power factor. The bus adjustment step includes: real-time detection of whether the AC side voltage exhibits characteristics of the diesel generator; if so, adjusting the bus reference voltage value to a safe range close to the overvoltage protection value. This invention's control method for an energy storage inverter coupled to a diesel generator improves the adaptability of the energy storage inverter to different diesel generators.

The application discloses a rectifier current loop control system based on a fractional order phase-locked loop observer, which comprises a rectification module, a phase-locked loop module, a coordinate transformation module, a fractional order phase-locked loop control module and a PWM modulation module; the input end of the rectification module is connected with a three-phase power grid voltage, and the output end outputs a direct current voltage; the input end of the phase-locked loop module is connected with the three-phase power grid voltage, and the output end outputs an electric angle and is connected with the input end of the coordinate transformation module and the input end of the PWM modulation module; the input end of the coordinate transformation module is connected with the output end current of the rectification module, and the output end is connected with the input end of the fractional order phase-locked loop control module; the fractional order phase-locked loop control module is connected with the PWM modulation module; and the PWM modulation module is connected with the rectification module. Compared with a traditional linear extended state observer, the fractional order phase-locked loop observer designed in the application has more obvious effects of suppressing resonance peaks and reducing current harmonic content, and has strong adaptability to parameter changes of the system.

The present application relates to the technical field of double three-phase permanent magnet synchronous motor harmonic current control, and discloses a double three-phase permanent magnet synchronous motor harmonic current control method and device, the present application is through to the motor voltage equation implementation modeling domain conversion and discretization processing, constructs the harmonic current loop controlled object of adaptation digitization control, complex vector current regulator and low pass filter discrete domain model, combines current signal multi-dimension pretreatment and accurate regulation transformation, fully compensates the delay of digital control, effectively offsets the influence of harmonic coupling and speed correlation. Compared with the prior art, the present application avoids the adaptive deviation of continuous domain design and digital control, solves the system instability problem caused by low pass filter delay and discretization error, and ensures that the motor has high harmonic current control precision and fast dynamic response in the full speed range.

The invention discloses a buck-boost topology-based power stabilizing power converter, which comprises a direct-current voltage-stabilized power supply, a battery pack and a control circuit, and is characterized in that a buck-boost two-path circuit is connected in parallel between the direct-current voltage-stabilized power supply and the battery pack and is connected with the control circuit, and the buck-boost two-path circuit is connected with the direct-current voltage-stabilized power supply and the battery pack. The control circuit adopts double closed-loop control or single current loop control of a voltage outer loop and a current inner loop to realize a forward boost discharge control mode or a reverse buck charge control mode of the power converter; according to the power stabilizing power supply converter, the use amount of power devices is reduced, the overall cost and loss of the power stabilizing power supply converter are reduced, the rated working efficiency of the power stabilizing power supply converter is improved, and the power stabilizing power supply converter has a boost and buck control function; and after the voltage of the battery pack reaches a set value, constant-voltage charging is adopted, so that the battery pack is prevented from being overcharged or not fully charged.

The invention relates to a distributed servo motor control architecture and method based on a cloud License. The problem that in the prior art, a servo system cannot achieve balance between real-time performance and flexible subscription is solved. The system comprises an integrated intelligent motor, a motor main body, an encoder, a power conversion module and a current loop control unit are integrated in the integrated intelligent motor, and the current loop control unit executes current closed-loop operation in a first period; the integrated intelligent motor is in communication connection with the edge gateway and executes position loop or speed loop operation in a second period; the edge gateway is in communication connection with the cloud controller through a 6G network interface or a time sensitive network TSN, the cloud controller issues an advanced control algorithm or a control parameter to the edge gateway in a License packet form, and the edge gateway is provided with a local verification module. The method has the advantages of thoroughly getting rid of the network delay constraint, reducing the one-time purchase cost of a user, realizing non-stop when the network is disconnected, and meeting the harsh availability requirement of an industrial field.

The application discloses a kind of time-sharing drive control method and system of double-winding motor, belong to motor drive technical field, method includes: each PWM period is divided into the first time period and the second time period of equal length;In the first time period, main controller executes the time-sharing drive control of main winding;In the second time period, slave controller executes the time-sharing drive control of slave winding.Adopt time-sharing drive mechanism, main winding and slave winding alternate work each occupies half PWM period, main and slave winding are all involved in output, average share work, can make full use of the output capacity of two windings, avoid the waste of the ability of standby winding, while it can avoid local overheating, thermal balance is good;At the same time, adopt time-sharing drive mechanism, main and slave winding asynchronous output, avoid current imbalance problem, without complex current loop control, reduce system cost and control algorithm is simple.

The application discloses a control circuit and a control method of a power factor correction circuit, and relates to the field of power converters.The control circuit comprises a current reference signal generating circuit, a current sampling circuit, a first subtractor, a first calculation unit, a current loop and a control signal generating circuit.The current reference signal generating circuit generates a current reference signal, the current sampling circuit outputs a current sampling signal, the first subtractor generates a first error signal according to the current sampling signal and the current reference signal, the first calculation unit generates a first parameter and a second parameter according to the current reference signal, the current loop generates a current loop control signal according to the first error signal, the first parameter and the second parameter, and the control signal generating circuit generates a driving control signal according to the current loop control signal.The gradual control of the first parameter and the second parameter of the control circuit can overcome the contradiction between ITHD and input current peak oscillation, improve ITHD and avoid the problem of peak oscillation.

The invention discloses a permanent magnet synchronous motor field-weakening control method based on power regulation, and relates to the technical field of motor field-weakening control. The method comprises the following steps: acquiring three-phase current and performing coordinate system conversion; acquiring an actual rotating speed based on motor rotor position information; establishing a power-current mapping relation; constructing an active power ring and a reactive power ring; starting of a reactive power loop is controlled through a threshold range, alpha-beta-axis current reference given is calculated, dq-axis current reference given is obtained through conversion, and the permanent magnet synchronous motor is driven to operate through current loop control and PWM wave generation. A current reference track is obtained through a power mapping relation, a traditional voltage control loop is omitted, a PI controller is adopted to construct a power control loop, good compatibility and execution efficiency are achieved, and field weakening and position-free cooperative operation can be achieved.

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.

The invention discloses a method for suppressing low-frequency secondary ripples of a single-phase UPS (Uninterrupted Power Supply) system adopting an active filter circuit, and relates to the technical field of filter circuits. Comprising the following steps: acquiring voltages at two ends of a support capacitor in an active filter circuit, a filter inductor current and a total output current of a storage battery pack in real time, and processing by a controller to generate a voltage loop control component; superposing the component with the total current in the current inner loop to form a comprehensive reference signal, comparing the comprehensive reference signal with the actual inductive current, and then generating a current loop control component through a current controller; and after carrying out per-unit processing, superposing a minimum boost duty ratio Dmin required by calculation, and carrying out comparison modulation with a carrier signal to generate a PWM (Pulse Width Modulation) driving signal for controlling a switching tube in the bidirectional Buck / Boost circuit. According to the invention, the bidirectional Buck / Boost active filtering is introduced to effectively suppress the low-frequency secondary ripple current of the DC side of the single-phase UPS system. The risk that when the load power changes, especially when the load is heavy, the voltage fluctuation of the supporting capacitor is aggravated, and the voltage valley value is too low, so that the system works abnormally is solved.

The application discloses a control method of a single / three-phase compatible bidirectional AC / DC converter in a single-phase inverter mode, which comprises the following steps: 1, a topological structure is a three-phase four-wire converter with split capacitors, comprising a three-phase active bridge arm composed of power devices and an N-phase passive bridge arm composed of split capacitors; 2, in the single-phase inverter mode, the A phase and the B phase are connected in parallel through relays, and the C phase and the N phase are also connected in parallel through relays to form a single-phase inverter output; 3, the A phase and the B phase are controlled by adopting a voltage effective value outer ring, a voltage instantaneous value inner ring and a current instantaneous value inner ring three-loop control, the AC output voltage is adjusted, and the C phase is controlled by adopting an independent current loop control, and the C and N phase current stress is adjusted. The application realizes mixed control of the inverter single-phase AC output voltage and the C and N phase current, can increase the single-phase output power to 1 / 2 of the three-phase rated power without increasing additional power devices and element overdesign.

The application provides a shore power supply box, and relates to the technical field of ship power supply. The direct-current power supply circuit in the shore power supply box comprises a first direct-current loop provided with a first circuit breaker, a second direct-current loop provided with a second circuit breaker and an interlocking mechanism; the first direct-current loop and the second direct-current loop are connected with the same direct-current power supply, and the direct-current voltages output by the first direct-current loop and the second direct-current loop are different; the interlocking mechanism is connected with the first circuit breaker and the second circuit breaker respectively to interlock and control the on-off of the first direct-current loop and the second direct-current loop, and the on-off states of the first circuit breaker and the second circuit breaker are different at the same time. The embodiment of the application can realize direct-current power supply through the first direct-current loop and the second direct-current loop, effectively meet the direct-current power supply demand of the ship, and effectively avoid the mutual interference of the first direct-current loop and the second direct-current loop due to simultaneous work in the mode of alternating work of the first direct-current loop and the second direct-current loop controlled by the interlocking mechanism, so that the safety of charging is ensured.

The embodiment of the invention provides a power converter and a control method of a power conversion circuit, the power converter comprises a controller and three bridge arms, and when the output level of each of the three bridge arms is zero level, a zero level current loop is formed in the three bridge arms. And the controller is used for inputting modulation signals to the three bridge arms, so that the three bridge arms convert the received direct current into alternating current and output the alternating current. The controller is further used for controlling the amplitude of the modulation signal input into any bridge arm to be increased when the voltage amplitude of the alternating current output by any bridge arm in the three bridge arms is lower than a voltage threshold value.

The invention discloses a high-proportion new energy power grid following-construction type converter cooperative fault ride-through method, which comprises the following steps that: in a fault occurrence stage, the voltage of a power grid drops, a construction type converter quickly responds to reactive power to support the voltage of a PCC point, and when the output current of the construction type converter reaches a current amplitude limiting upper limit, the PCC point voltage is supported; the virtual impedance is used for limiting the output current of the grid-forming type converter, in the fault transition stage, a current loop control instruction of the grid-forming type converter is directly given according to the low-voltage ride-through standard, the PCC point voltage is increased, and the virtual impedance of the grid-forming type converter is reduced along with the fault current; and in the fault clearing stage, the network construction type converter adjusts a reactive instruction to absorb excess reactive power, and transient overvoltage of the PCC point is cooperatively inhibited. According to the method, the voltage supporting capability difference of the two converters in different fault stages is utilized, so that the supporting capability of the following-construction network type converter series-parallel system on the power grid voltage in the fault stage is effectively improved.

This invention provides a current loop control method and system for a permanent magnet synchronous motor. The method includes: obtaining the upper and lower boundaries of the direct and quadrature axes of the motor inductance, respectively; calculating the proportional control parameter ranges of the controller parameter limiter on the D and Q axes; using the proportional control parameters corresponding to the nominal inductance value as the initial parameters of the controller for current loop control; obtaining the current control error, the maximum current overshoot within the command cycle, and the current rise time; calculating the controller parameter correction based on the controller parameter adaptive law; calculating the controller parameters for the next cycle based on the parameter correction; processing the controller parameters through the limiter and using them as the controller parameters for current loop control; and transforming the current loop control output to obtain the UVW three-phase command voltage signal, which is then used to generate a power switch control signal to control the motor via SVPWM. This scheme not only avoids the complexity and time-consuming problems of controller parameter debugging but also enables tracking control of the command current, ensuring stable motor output torque.

The invention discloses a control method of an energy storage inverter coupled with a diesel generator, which comprises a harmonic suppression step, a reactive compensation step and a bus adjustment step, and the harmonic suppression step comprises the following steps: dynamically adjusting proportional control parameters of current loop control according to the voltage of the diesel generator; a filtering module is introduced in feedforward signal processing; the reactive power compensation step comprises the following steps: actively outputting reactive power compensation quantity according to load characteristics so as to counteract the influence of a capacitive load on the power factor of the diesel generator; the bus adjusting step comprises the steps of detecting whether the voltage of the alternating current side has the characteristics of a diesel generator or not in real time, and if yes, adjusting a bus reference voltage value to be close to a safety range of an overvoltage protection value. According to the control method of the energy storage inverter coupled with the diesel generator, provided by the invention, the adaptability of the energy storage inverter to different diesel generators is improved.

This invention discloses a smooth switching control method and device for a dual-winding reconfigurable permanent magnet synchronous motor, relating to the field of motor control technology. The invention effectively divides the dual-winding reconfigurable permanent magnet synchronous motor into multiple unit motors, converting the system current loop controlled variable into unit motor currents through variable gain. When the motor winding state switches, the PWM duty cycle signal is controlled by adjusting the variable gain: when the winding state switches from parallel to series, the terminal voltage of the original motor after the switch is increased to n times that in parallel; when the winding state switches from series to parallel, the terminal voltage of the original motor after the switch is reduced to 1 / n of that in series. This control process strictly maintains the direct and quadrature axis currents of the unit motors before and after the switching when the windings switch between series and parallel, thereby keeping the total output torque of the original motor constant, completely eliminating system speed fluctuations, and achieving smooth and seamless switching of the dual-winding reconfigurable permanent magnet synchronous motor.

The invention discloses an intelligent control driving system of a permanent magnet motor, which performs parallel real-time identification by taking d-axis and q-axis inductance related to current intensity as fast time-varying parameters and taking stator resistance and permanent magnet flux linkage related to temperature as slow time-varying parameters. In this way, the system can obtain the parameter model accurately matched with the current physical state of the motor in real time, and then an optimal current instruction is generated and self-adaptive current loop control is achieved. Through the mode, the problem that the control performance is reduced due to parameter mismatch is fundamentally solved, and the control precision, the operation efficiency and the stability of the permanent magnet motor in a wide working condition range are comprehensively improved.

The invention relates to a high-precision driving system, device and equipment supporting three-motor control. The system comprises the steps of acquiring the position of a motor rotor through an interrupt acquisition mode based on a Hall sensor signal, generating a motor driving PWM signal through a six-step commutation algorithm according to the position of the motor rotor, and converting current loop control into motor torque loop control through a PID control algorithm according to a phase current feedback signal. Hall signals are collected in real time in an interruption mode, it is ensured that the position of the rotor is sensed accurately and timely, and a foundation is laid for efficient driving; six-step commutation is executed based on the rotor position, and a hardware linkage mechanism is utilized to convert single-path PWM into six-path driving signals, so that efficient and reliable control of the motor is realized; through high-precision current feedback and PID closed-loop adjustment, a current loop is converted into a torque loop according to a torque-current proportional relation, and accurate, stable and anti-interference control over the output torque of the motor is achieved.

The invention discloses a GFL-VSC transient stability analysis method and system considering LVRT control, and belongs to the technical field of power system safety and stability analysis. The method comprises the following steps: decomposing a full-order model into a low-order fast subsystem and a low-order slow subsystem by using small parameters based on a singular perturbation theory according to a time scale difference between a current loop and a phase-locked loop; in the slow subsystem, solving a nonlinear differential equation of a phase-locked loop by using a multi-scale method to obtain an approximate analytical solution based on initial conditions, system parameters and fault depth, and establishing a stable boundary criterion according to the approximate analytical solution; and in the fast subsystem, establishing a dynamic model comprising a time-varying item, solving to obtain an analytic solution of the dynamic model, and determining the transient stability of the GFL-VSC under the influence of the current loop control parameters according to the stability boundary criterion and the analytic solution. According to the method, the transient stability of the GFL-VSC considering the LVRT control can be effectively analyzed.

The application discloses a five-phase permanent magnet synchronous motor harmonic current control method and device based on impedance remodeling, relates to the high-performance driving control technical field of a multi-phase permanent magnet synchronous motor, and comprises the following steps: obtaining motor current, combining system total delay to calculate stability boundary, then selecting optimal virtual impedance, auxiliary attenuation gain parameter combination and current loop control bandwidth by using a Bode diagram, and constructing a current decoupling controller comprising an impedance remodeling channel, a coupling damping compensation channel and a proportional integral regulator; then inputting motor real-time operation information and a given reference current, so that a target reference voltage is obtained to drive the motor to operate. By means of optimal parameter combination, the motor port impedance is equivalently reconstructed, disturbances caused by the nonlinear dead zone of an inverter and the voltage drop of a switching tube are weakened, wide-frequency-domain harmonic current suppression is realized, the impedance remodeling channel, the coupling damping compensation channel and the proportional integral regulator jointly constitute a two-degree-of-freedom control structure, and the dynamic response speed and the anti-disturbance capability are decoupled and independently adjusted.

This invention discloses a method and electronic device for harmonic current distribution in a microgrid. The method acquires the terminal voltage and grid-side current of each micro-source inverter in the microgrid, and calculates the actual power through conjugate operations. A second-order generalized integrator is used to extract the fundamental current component from the grid-side current to obtain the harmonic current and calculate its effective value. The remaining capacity of each inverter is calculated based on its rated capacity and actual power. Based on the remaining capacity, a consensus algorithm is used to calculate the weighting coefficient and global consensus control quantity, and then the harmonic virtual impedance is calculated. The harmonic virtual impedance is superimposed with the fundamental virtual impedance and applied to the voltage loop and current loop control to achieve harmonic current distribution proportional to the remaining capacity. This invention achieves reasonable distribution of harmonic current in microgrids with high penetration of new energy sources, avoids inverter overload, improves power quality, has a simple implementation scheme, requires no multi-harmonic resonant controller, has low computational complexity, is easy to deploy in engineering, and is suitable for both off-grid and grid-connected operation scenarios.