30results about How to "Fast dynamic response" patented technology

This invention relates to the field of industrial unmanned aerial vehicle (UAV) technology, specifically a hydrogen fuel cell and lithium battery hybrid UAV. The UAV includes a fuselage, a high-pressure hydrogen storage tank fixedly mounted on top of a gas cylinder mounting base, a battery stack mounted on the bottom of a mounting frame assembly, and a circuit control module located inside the mounting frame assembly. This hydrogen fuel cell and lithium battery hybrid UAV, based on multi-source data fusion and a sliding window anti-disturbance design, achieves accurate identification of all operating conditions, including steady-state cruise, high-power transients, surplus recharge, and regenerative braking. It is equipped with a differentiated intelligent power allocation algorithm, enabling a dynamic allocation strategy that allows for continuous and stable main power supply from the fuel cell during cruise, coordinated lithium battery replenishment during high-power conditions, and real-time recharge of the lithium battery with surplus power. Through a power change rate feedforward compensation design, it maximizes the utilization of the high energy density of hydrogen energy while simultaneously achieving energy recovery and reuse, further improving the system's energy utilization rate.

The application discloses a non-magnetic ring proportional pressure reducing electromagnetic valve for a hydraulic system, a first through hole, a second through hole and a first blind hole are formed in the valve body, a pressure relief hole and a pressure inlet hole are formed in the side wall of the valve body, the pressure relief hole and the pressure inlet hole are communicated with the first through hole, a working hole is radially formed in the side wall of the valve body, the inner end of the working hole is communicated with the first through hole, and the outer end extends to the outer surface of the valve body, a valve core is axially movably installed in the first through hole, and a fifth outer groove and a first annular protrusion are arranged on the outer periphery of the valve core, the first annular protrusion forms an annular gap with the inner wall of the first through hole, a coil assembly is arranged in the yoke, a stop iron is fixedly arranged in the yoke through a mounting plate, and a magnetic circuit optimization structure is arranged on the outer surface of the stop iron. The magnetic circuit optimization and the multiple anti-sticking and friction-reducing designs are integrated, the independent magnetic ring is cancelled, the structure is simplified, the electromagnetic force, the response speed and the service life of the electromagnetic valve are comprehensively improved, the processing difficulty is obviously reduced, and the application range of the electromagnetic valve is widened.

The application discloses a kind of adaptive compensation method and related device for three-phase current imbalance and harmonic, belong to power system technical field;The method is based on the instantaneous reactive power theory and the quick separation and instruction generation of fundamental wave positive sequence component and unbalance compensation component of sliding discrete fourier transform;Multi-objective model predictive current control with embedded repeated learning correction mechanism to achieve high-precision tracking of compensation current instruction and system circulation suppression;Multi-objective weight factor online dynamic adjustment mechanism based on fuzzy reasoning, according to the adaptive balance between the control emphasis of tracking accuracy, circulation suppression and switching loss according to the real-time operating state of the system;And, adaptive closed-loop management architecture based on the above module cooperation, drive active power electronic converter to generate compensation current, realize the comprehensive management of three-phase imbalance and harmonic and global optimization of system performance.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

This invention relates to a constant pressure control system for an optical cavity based on pump-valve coordination and water immersion sensing, and its active protection method. Belonging to the fields of precision instrument control and industrial automation, the system integrates an electronically controlled proportional valve and an air pump through a pump-valve coordinated pressure control unit. It dynamically adjusts the intake and exhaust flow rates based on an adaptive PID algorithm and a coordinated allocation function, achieving high-precision, rapid, bidirectional adjustment of the optical cavity pressure. Simultaneously, it employs a dual environmental sensing unit including visual perception and capacitive liquid level sensing, which executes constant pressure control and active anti-intrusion monitoring in parallel through an intelligent coordinated control unit. When visual detection identifies a risk of water intrusion, the system proactively limits the pump speed; when the capacitive sensor detects liquid water intrusion, it immediately executes an emergency shutdown. This solves the problem of difficulty in coordinating pressure control and safety assurance in traditional technologies, achieving a unified approach of long-term precise constant pressure and active contamination protection, significantly improving the system's reliability, safety, and intelligence level under complex operating conditions.

This invention relates to a high-voltage, capacitor-free, low-noise linear regulator. It comprises a high-voltage switching voltage follower, a self-zeroing error amplifier, and voltage divider resistors. The high-voltage switching voltage follower significantly enhances the system's transient response to load changes and improves power supply rejection in the mid-frequency range. The self-zeroing error amplifier, together with the high-voltage switching voltage follower, forms a global slow loop. The self-zeroing error amplifier employs a ping-pong self-zeroing method, effectively reducing low-frequency flicker noise and offset while ensuring continuous operation in the time domain. This invention introduces a settling phase between the self-zeroing and amplification phases of the ping-pong module, significantly reducing output glitches caused by amplifier settling time. This invention operates stably without an external output capacitor, supports a wide input and output voltage range, and possesses excellent characteristics such as low noise, high power supply rejection, and fast response, making it suitable for various demanding high-voltage power supply applications.

This invention relates to the field of spacecraft power technology, and in particular to a space power system with controllable power flow and its control method. It includes a spacecraft primary bus, a power electronic converter with controllable power flow, an energy storage unit, a logic control unit, a load, and a power distribution switch. The positive terminal of the spacecraft primary bus is connected to one end of the power distribution switch and one input terminal of the power electronic converter with controllable power flow. One end of the load is connected to the other end of the power distribution switch. The other input terminal of the power electronic converter with controllable power flow is connected to the other end of the load and the negative terminal of the spacecraft primary bus. The input terminal of the energy storage unit is connected to the output terminal of the power electronic converter with controllable power flow. The logic control unit is used to collect the voltage at the positive and negative terminals of the spacecraft primary bus and the current of the load. This invention features high power density, fast dynamic response, simple circuit structure, and avoids severe electromagnetic interference.

The utility model discloses a kind of energy storage load tracking control architecture, it is related to energy storage control technical field, comprising: alternating current incoming line side's current sampling sensor;Power electronic converter, with external current voltage sampling interface;The power electronic converter obtains the current signal of alternating current incoming line side in real time by the external current voltage sampling interface, and carries out real-time tracking control, realizes load tracking and prevents reverse flow function, the architecture is suitable for the multi-source fusion system including photovoltaic, charging pile, wind energy, diesel generator at least one, the system tracks single-phase and three-phase load change in the process of charging, discharging. The energy storage load tracking control architecture, by increasing current sampling sensor in alternating current incoming line side and increasing sampling interface for PCS, control function is decentralized to PCS, so that the dynamic response speed of system is greatly improved.

This invention provides an ultra-fast commutation square-wave AC welding power supply, comprising: a rectifier bridge circuit for rectifying AC to DC; a filter and voltage regulator circuit for eliminating high-order ripple and obtaining smooth DC; a full-bridge inverter circuit for converting DC to high-frequency AC; a high-frequency transformer for isolation and voltage reduction; a secondary full-bridge rectifier circuit for converting high-frequency AC to DC; a coupling inductor for coupling; a half-bridge inverter circuit for converting DC to AC square waves; and a constant voltage clamping circuit; the load is connected between the midpoint of the half-bridge inverter circuit and the center tap of the high-frequency transformer. This power supply enables faster commutation of square-wave AC current and energy recovery during the commutation process, thereby improving the stability of the AC welding process and the conversion efficiency of the square-wave AC welding power supply.

The present application relates to the technical field of electric machines, and relates to an online efficiency optimization method for a permanent magnet synchronous motor. For each preset fixed control period of a motor controller of a target vehicle, a motor battery state parameter in the fixed control period is acquired. The motor battery state parameter is preprocessed. The preprocessed motor battery state parameter is input into an input layer of a current prediction model, and then sequentially passes through a first hidden layer, a second hidden layer and an output layer to obtain a predicted current instruction. According to the predicted current instruction and a preset current constant, current values of d-axis and q-axis are determined, so as to control the motor controller according to the current values of d-axis and q-axis. Through the trained current prediction model, the best current distribution instruction can be quickly given under any combination of speed, torque, battery state and temperature, and the motor efficiency is significantly improved.

The invention relates to the technical field of brushless direct current motors, in particular to a heat dissipation and weight reduction collaborative optimization method for a rotor shell of a brushless direct current motor. The method comprises the following steps: determining the minimum allowable value of the thickness of the radiating rib according to the mechanical strength requirement and the processing technology feasibility of a rotor shell material; according to the total axial length of the rotor shell and the minimum allowable value of the thickness of the radiating ribs, the maximum number of the radiating ribs which can be arranged on the outer surface of the rotor shell is calculated; a plurality of radiating ribs are uniformly arranged on the outer surface of the rotor shell according to the maximum number and the minimum allowable thickness of the radiating ribs, so that the plane where the radiating ribs are located is perpendicular to the axis of the rotor shell; and the sharp edges of the heat dissipation ribs are blunted to obtain the rotor shell with the heat dissipation performance and the weight reduction performance cooperatively optimized. Through the characteristic that the sectional area of the rectangular-section radiating ribs is smaller under the same radiating area, the weight of the rotor shell is reduced on the premise that the radiating performance is not reduced, and meanwhile, the structural strength is ensured.

The present application relates to the technical field of motor control, and in particular to a driving control method and system for a three-phase direct-current brushless motor driving chip, which solves the technical problem of low control precision, dynamic response lag and reduced operation energy efficiency under complex working conditions caused by the lack of adaptive adjustment mechanism due to the dependence on fixed parameters in the prior art. The method comprises: obtaining running state data of the three-phase direct-current brushless motor; determining a comprehensive performance evaluation index of the three-phase direct-current brushless motor according to the running state data; the comprehensive performance evaluation index is used to quantitatively represent the performance of the three-phase direct-current brushless motor in terms of efficiency, dynamic response and running stability; determining the performance deterioration dominant type of the three-phase direct-current brushless motor according to the comprehensive performance evaluation index; the performance deterioration dominant type is used to indicate the main factor category leading to the performance decline; and adaptively adjusting the driving control strategy for the three-phase direct-current brushless motor according to the performance deterioration dominant type.

The utility model discloses a kind of internal gear gear grinding machine workpiece main shaft device, comprising: worm gear mechanism, and worm mechanism, wherein, the worm gear mechanism includes: workpiece main shaft, workpiece main shaft box is installed on the workpiece main shaft, index worm wheel is installed on the workpiece main shaft;The worm mechanism includes: double floating worm, the double floating worm is engaged with the index worm wheel, the end of the double floating worm is connected with power mechanism, and the power mechanism is installed on the workpiece main shaft box. By designing a set of meshing side gap adjustable high-precision double floating worm gear mechanism inside headstock, the precision of main shaft can be adjusted during working process, so that transmission efficiency is high, can bear larger load and torque, realize smooth transmission, and adjustment is simple, convenient for later maintenance.

The utility model provides a kind of multi-unit moving coil motor, including at least two parallelly arranged substrates and the rotating shaft passing through the end surface of substrate, first coil winding and second coil winding are evenly arranged in the two end surfaces of substrate, first permanent magnet group and second permanent magnet group are arranged in the two end surfaces of substrate, first permanent magnet group and second permanent magnet group are all suspended outside first coil winding and second coil winding, fixed plate is arranged in the side of first permanent magnet group and second permanent magnet group away from substrate, first permanent magnet group and second permanent magnet group are all fixed on the fixed plate.The permanent magnet group of the application can form coverage to the deflection range of first coil winding and second coil winding, secondly, the magnet is arranged on both sides of coil in the application, compared with the magnet on one side, it has better magnetic field intensity.Finally, the application is arranged by parallelly arranging multiple substrates, compared with single substrate, it can provide stronger torsion to rotating shaft.

This invention discloses a self-leveling air gap equalization and multi-cavity pressure-stabilized ultra-low disturbance air cavity system and control method, belonging to the field of aircraft control and ground simulation. The system includes an outer axis air-bearing sleeve, an inner axis moving sleeve, a lifting device, a surrounding air gap monitoring device, a distributed air pressure sensor array, and an air path control board. A surrounding interconnected air path is used to automatically eliminate air gap pressure difference. Combined with zoned air supply and feedforward pressure field shaping, a synchronous lifting device maintains a constant air cavity volume to reduce hysteresis effects. The control method relies on offline training of a neural network to construct a compensation model and uses feedforward neural backstepping control to achieve closed-loop pressure stabilization and disturbance suppression. This invention can effectively improve the accuracy, stability, and dynamic response of vertical microgravity simulation, solving the multi-source disturbance problems caused by air gap imbalance, supply and exhaust coupling, and hysteresis feedback in traditional aerodynamic compensation systems.

The utility model provides an improved moving coil type deflection motor, including base plate and pivot, first coil winding and second coil winding are all provided with in the both ends of base plate, first coil winding and second coil winding are symmetrical distribution to pivot, first permanent magnet group and second permanent magnet group are provided with respectively in the both ends of base plate, the polarity of the permanent magnet group all wraps two permanent magnet adjacent the permanent magnet, when first coil winding and second coil winding repeatedly deflect with pivot as the axis, first permanent magnet group and second permanent magnet group can form the coverage to the deflection range of first coil winding and second coil winding respectively. The application is through setting up magnet in coil winding both sides, makes the coil always to be under the even high intensity magnetic field coverage in whole movement range, has no magnetic field gradient interference, dynamic response is faster and more stable, to realize more accurate displacement and speed control, be more suitable for being applied to the precision instrument that needs high accuracy positioning.

This invention relates to the field of motor control technology, and in particular to a segmented hybrid predictive torque control method for permanent magnet synchronous motors under low carrier ratios. This method first monitors the motor's operating status in real time and dynamically divides it into a large-error transient region, a small-error adjustment region, and a steady-state ripple suppression region based on torque error, flux linkage error, and speed. For each region, three hybrid strategies are employed: multi-vector model predictive control, a hybrid strategy of model predictive control and duty cycle modulation, and an improved model predictive control based on disturbance observation compensation. This invention, through a partitioned matching strategy, effectively solves the problems of low model prediction accuracy and prominent contradictions between dynamic response and steady-state ripple in traditional predictive torque control at low switching frequencies, significantly improving the system's control performance, accuracy, and robustness across the entire operating range, and is particularly suitable for medium- and high-voltage high-power drive applications.

This utility model relates to the field of control chip technology and discloses a power control chip, including a baseboard. A feedback sampling unit, an error amplifier, a load trend prediction unit, and a collaborative control logic unit are disposed on one side of the upper end of the baseboard. A current sampling unit, logic and drive circuits, and a multi-mode protection circuit are disposed in the middle of the upper end of the baseboard. In this utility model, by integrating the load trend prediction unit and the collaborative control logic unit into the power control chip, the traditional passive response is transformed into active prediction. When a sudden change in load is about to occur, the prediction unit can sense the trend in advance and notify the collaborative control logic, enabling it to proactively adjust the PWM output frequency. Thus, when the load change actually occurs, the system has already entered the optimal operating state in advance, effectively suppressing output voltage overshoot and drop, significantly improving dynamic response speed, and enhancing system stability and reliability.

This utility model relates to the field of circuit equipment technology and discloses a busbar copper bus structure for improving parasitic inductance. It includes an improved busbar copper bus and a non-improved busbar copper bus. The improved busbar copper bus has a copper busbar substrate in the middle, a bent portion fixedly connected to the top of the substrate, a connecting portion fixedly connected to the top of the bent portion, and wiring extension plates fixedly connected to the lower sides of both sides of the substrate. A bent plate is fixedly connected to the other end of each wiring extension plate, and a wiring plate is fixedly connected to the other end of each bent plate. This busbar copper bus structure for improving parasitic inductance has a short distance of 17.5mm from the positive terminal of the positive busbar copper bus to the positive capacitor terminal, resulting in a shorter current path and better overall performance. It achieves the following technical effects: 1. Reduced parasitic inductance; 2. Improved dynamic response; 3. Optimized current sharing and thermal performance; 4. Suppression of electromagnetic interference (EMI); 5. Maximized capacitor efficiency.

The application provides a switch frequency determination method and device for an LCC resonant converter, the method comprising: obtaining an input voltage and an output voltage of the LCC resonant converter; determining a starting mode in which the LCC resonant converter is currently located by using the output voltage; determining a calculation program corresponding to the starting mode by using the starting mode in which the LCC resonant converter is currently located, wherein the calculation program is an operation logic program designed for the starting mode by using a field programmable logic gate array; inputting the input voltage and the output voltage into the field programmable logic gate array, and calculating the switch frequency of the LCC resonant converter by using the calculation program, so that the switch frequency determination method improves the adjustment rate of the switch frequency of the LCC resonant converter, the rising speed of the output voltage, and further improves the dynamic response speed of an existing power supply.

The application relates to a high-precision bipolar programmable constant current source based on multi-piece AD time-sharing sampling, which comprises a bipolar ACDC switching power supply, a pre-charging resistor R1, a pre-charging bypass relay K1, a capacitor E1, a controllable inverter H bridge, a current sampling unit A1, a total controller, an inductor L1 and a load inductor L2; wherein the sampling speed of the current sampling unit A1 is configured to be N times higher than the switching frequency of the controllable inverter H bridge; the A1 comprises a control chip and N pieces of AD conversion chips, the input signals of the AD conversion chips are all the output currents of the controllable inverter H bridge, the AD conversion chips are configured to time-sharingly and sequentially sample the current signals at equal intervals, and the sampling results are sequentially sent into the control chip according to time sequence; after one round of sampling is completed, the control chip immediately starts the next round of equal-interval current sampling, and the average value of the data sampled in the last round is sent to the total controller as feedback.

The application belongs to the technical field of rudder machine instruction processing, and specifically discloses a rudder machine instruction smoothing speed limiting method based on a differential step length. The method comprises the following steps: receiving an instruction frame sent by an upper computer according to a communication protocol, and analyzing the instruction frame to determine a rudder control instruction; determining a closed-loop instruction by using the rudder control instruction; obtaining potentiometer data, and processing the potentiometer data to obtain rudder feedback data, wherein the potentiometer is used to obtain the displacement of a motor output shaft of a rudder machine driven by a driver; processing the closed-loop instruction and the rudder feedback data according to a rudder machine mathematical model to obtain a control signal, which is used for driver control. The scheme solves the three core problems in the control of a traditional electric rudder machine, i.e., the technical difficulties of instantaneous current impact, mechanical vibration and overshoot, and back electromotive force hazards.

The utility model provides a moving -coil type deflection motor, including base plate and pivot, first coil winding and second coil winding are all provided with in the both end faces of base plate, first coil winding and second coil winding are symmetrical distribution to pivot, first permanent magnet group and second permanent magnet group of polarity opposite are provided with respectively in the both end faces of base plate, above -mentioned two respectively hang in first coil winding and second coil winding outside, when first coil winding and second coil winding repeatedly deflect with pivot as the axle, first permanent magnet group and second permanent magnet group can form the coverage to the deflection range of first coil winding and second coil winding respectively. The present application is through setting up magnet in coil winding both sides, makes the coil always be under the uniform high -intensity magnetic field coverage in whole movement range, has no magnetic field gradient interference, dynamic response is faster and more stable, can realize more accurate displacement and speed control, is more suitable for being applied to the precision instrument of need high accuracy positioning.

The application discloses a low-noise current sampling and suppression system for capacity grading test, relates to the field of battery test, and comprises a main current sampling shunt, a main current sampling connecting copper bar, blind measurement wiring and an analog front-end compensation circuit; the main current sampling shunt is connected in series in a main circuit; one end of the main current sampling connecting copper bar is connected with the main current sampling shunt; the blind measurement wiring is arranged in parallel with the main current sampling connecting copper bar on the surface of a same test tray, and both ends of the blind measurement wiring are connected with the input end of the analog front-end compensation circuit; the analog front-end compensation circuit collects voltage signals from both ends of the blind measurement wiring, generates an inverted compensation signal through inversion processing, then superimposes the inverted compensation signal with the collected main sampling voltage signal to output a direct-current compensation voltage signal. The application solves the problem that the serious cumulative error of capacity calculation is caused by the direct-current drift noise of thermoelectric potential generated due to the space temperature gradient in the battery test.

The application discloses an unmanned ship formation control optimization method based on a double-channel reinforcement learning framework, aiming at solving the problems of existing adaptive dynamic programming control parameter setting difficulty, traditional genetic algorithm easy to fall into local optimum and multi-dimensional error physical quantity dimension not unified. The application constructs an unmanned ship formation mathematical model and a bottom online control channel, and constructs an upper offline optimization channel; a dimensionless fitness function based on state energy ratio is designed; the upper channel utilizes a reinforcement learning intelligent agent to dynamically decide a genetic operator selection strategy according to a population evolution state to generate a control parameter, the bottom channel utilizes the parameter to perform simulation and feeds back a performance index to the upper channel to update a decision model, and the optimal control parameter is output through double-channel closed-loop iteration. The application improves control parameter optimization efficiency and precision, eliminates the interference of order of magnitude difference on optimization, and significantly enhances the dynamic response speed, steady-state tracking precision and adaptive capacity of the unmanned ship formation system.

This invention discloses a wide-input micro-SIP packaged isolated voltage regulator module and its control circuit, belonging to the technical field of voltage regulator modules. The voltage regulator module adopts a six-layer vertical stacked structure, including a metal heat sink, a chip layer integrating GaN power switches and a control ASIC, a multi-layer ceramic substrate with embedded capacitors, an embedded magnetic layer integrating a planar transformer, a three-dimensional creepage structure isolation barrier layer, and a bottom solder ball array. The control ASIC samples the input voltage and load current in real time, dynamically switching between PWM mode, frequency hopping mode, burst mode, or resonant mode according to the input voltage threshold and load conditions. In resonant mode, valley-level turn-on is achieved by detecting the drain voltage valley. In PWM mode, frequency conversion control inversely proportional to the input voltage is used. This invention achieves high-efficiency voltage regulation output under wide input voltage through SIP packaging and multi-mode adaptive control, significantly reducing module size and standby power consumption.

This invention relates to a joint module integrating a torque sensor and a harmonic reducer, belonging to the field of robot joint module technology. The joint module includes a harmonic reducer and a hollow shaft, with the harmonic reducer and hollow shaft coaxially fixedly assembled. A brake housing is coaxially mounted behind the harmonic reducer, and an electromagnetic brake and friction plates are installed inside the brake housing. This invention eliminates couplings, additional connecting flanges, and other transitional connecting parts, highly integrating the torque sensor and harmonic reducer. The frameless motor is directly connected to the wave generator, and the controller is built-in. This reduces the overall axial length by 22%, the radial length by 25%, and the weight by 15%-30%, significantly improving space utilization. It is more suitable for collaborative robots, service robots, and other equipment with stringent requirements for lightweighting and miniaturization, solving the technical defects of large joint modules and large space occupation in existing technologies.

This invention relates to the field of motor control technology, specifically to a method and system for mitigating open-circuit faults in a three-phase induction motor. The method includes: obtaining a speed setpoint and the actual speed to form a speed deviation; inputting the speed deviation into a composite speed controller in a closed-loop V / f control structure to generate a frequency adjustment quantity; determining a target frequency command based on the frequency adjustment quantity and pole number conversion relationship, and generating a stator voltage amplitude command under a constant V / f ratio; obtaining the synchronous electrical angle through integration and generating a modulation signal; performing pulse width modulation based on the modulation signal to drive the three-phase inverter to output three-phase drive voltage; and when a stator phase open circuit causes a double-frequency disturbance in the dq coordinate system, using a resonant adjustment branch for tracking compensation to reduce speed fluctuations and electromagnetic torque pulsation, maintaining continuous motor rotation. This invention solves the problem of high control system complexity in existing induction motors due to reliance on independent fault detection and complex fault-tolerant switching mechanisms.

A fast reactive current control method and system for converters based on centralized sampling on the grid side is proposed. Based on the spectral characteristics of composite harmonics, a clustering method is used to obtain the cluster center harmonic frequency bands of multiple frequency bands. The resonant peaks are determined based on the principle that each resonant peak covers two adjacent cluster center harmonic frequency bands. The reduction ratio of the delay time in the repetitive controller is determined based on the frequency of each resonant peak and the fundamental frequency, resulting in an improved fast repetitive controller. The delay element in the feedback branch of the improved fast repetitive controller is decomposed into an integer-order delay element and a fractional-order delay element connected in series. The fractional-order delay element is compensated to obtain a compensated fast repetitive controller. The fast repetitive composite controller obtained by connecting the compensated fast repetitive controller in parallel with a PI controller serves as the improved current inner loop. Based on the voltage outer loop and the improved current inner loop, fast reactive current control is achieved, realizing rapid reactive current compensation.