66 results about "Hysteresis control" patented technology

The invention discloses a micro-grid power control method, system and device based on fuzzy modulation and a storage medium, and relates to the technical field of intelligent grid integration of a photovoltaic system and a micro-grid, and the method comprises the steps: firstly obtaining the real-time power data of a photovoltaic system, carrying out the control processing through fuzzy logic, and calculating a reference instruction; according to the reference instruction, hysteresis time is dynamically adjusted through modulation hysteresis control, and an inverter switching signal is generated; converting direct current into alternating current based on the switching signal and a power switching device, injecting the alternating current into the micro-grid, calculating active and reactive power reference values, ensuring that the system operates according to a unit power factor, and giving active power to the reference value; according to the method, the power control precision and adaptability of the micro-grid are improved, excessive switching of the inverter is avoided, loss is reduced, the service life is prolonged, power matching and stable transmission are achieved, reactive loss is reduced, bus voltage is stabilized, harmonic waves can be reduced, the electric energy quality is improved, and efficient and stable operation of the micro-grid is guaranteed.

The embodiment of the invention provides a circuit protection device and a chip, and the device comprises a detection module which is used for detecting whether the voltage of a power supply exceeds a voltage protection threshold, and outputting a low-level signal to a time hysteresis control module when the voltage exceeds the voltage protection threshold; if not, a high-level signal is output to the time hysteresis control module; the time hysteresis control module is used for receiving the low-level signal output by the detection module and controlling an MOS tube in the time hysteresis control module to be turned off; and the control module is used for receiving the high-level signal output by the detection module, timing and controlling the MOS tube to start when the timing time reaches the preset time, so that the problem that the power supply end fluctuates between a protection mode and a normal working mode when the input power supply rapidly fluctuates in the overvoltage and power failure protection circuit in the related technology is solved. In addition, common simple devices are needed for implementation, the cost is low, and the reliability is high.

The invention relates to the technical field of electronic display, and discloses a liquid crystal display screen display control system based on multi-mode driving. The system comprises a content feature analysis module, a mode decision engine, a driving parameter library and a liquid crystal driving signal generation module. Multi-dimensional feature vectors are extracted through the content feature analysis module, a nonlinear decision mechanism combining fuzzy reasoning and hysteresis control is adopted, and single fixed threshold judgment in the prior art is thoroughly abandoned. The system can accurately capture dynamic characteristics of display content, effectively avoids the problem of mode oscillation in a threshold critical region, and realizes smooth and stable switching of driving modes. According to the invention, the hysteresis comparator and the continuous frame decision logic are introduced, so that the anti-interference capability and decision stability of the system are remarkably enhanced. The system does not trigger mode switching due to instantaneous noise or slight jitter of a single-frame image, so that the continuity of display experience is ensured, and extra power consumption caused by frequent switching is reduced.

The present application relates to a kind of full digital hysteresis control method of inductance-free three-level inverter sampling time online prediction, belong to power electronic converter technical field, solve the dependence of full digital hysteresis control algorithm of three-level converter on high sampling rate, and the problem of being greatly influenced by main circuit filter parameter, it includes determining the mathematical model and modulation method of three-level converter, determining the full digital three-level hysteresis control algorithm of inductance-free sampling time online prediction, correction prediction sampling time interval.The full digital hysteresis control method is used for inductance-free three-level inverter hysteresis control simulation.

A device including an inverter circuit, a hysteresis control circuit, and a high-side input level shifter. The inverter circuit having an output and including at least two series connected PMOS transistors connected, at the output, in series to at least two series connected NMOS transistors. The hysteresis control circuit coupled to the output to provide feedback to the at least two series connected PMOS transistors and to the at least two series connected NMOS transistors. The high-side input level shifter connected to gates of the at least two PMOS transistors and configured to shift a low level of an input signal to a higher level and provide the higher level to one or more of the gates of the at least two PMOS transistors.

The application provides a power battery heating noise processing method and device and an electric vehicle, and relates to the field of noise control.The application comprises the following steps: receiving a power battery heating instruction, and generating a d-axis current instruction and a q-axis current instruction according to the power battery heating instruction; outputting a q-axis voltage through a PI controller according to the q-axis current instruction, so as to control the q-axis current with an output value of zero; controlling a d-axis voltage to be output through hysteresis control according to the d-axis current instruction; generating a random factor at a preset frequency, adjusting the amplitude of the d-axis voltage according to the random factor, randomly adjusting the current slope of the motor at each pulse current point, generating a random pulse current acting on the power battery, and making the noise generated in the battery heating process randomly distributed, so as to solve the problem that the existing power battery heating process using high-frequency constant-frequency alternating current generates high-frequency sharp and piercing noise.

This invention relates to the fields of precision machining and intelligent manufacturing technology, and discloses a method for machining valve core holes in aerospace housing parts. This method employs an intelligent tool system integrated with a piezoelectric ceramic stack, which enables self-sensing monitoring and active vibration suppression closed-loop control of machining chatter. When the detected chatter amplitude exceeds an activation threshold, the system switches from monitoring to active vibration suppression, generating high-frequency vibrations by exciting the stack to suppress chatter, while simultaneously completing the finishing of the hole wall. When the chatter amplitude falls below a safety threshold, the system returns to monitoring mode. This invention solves the problems of system response lag and low integration by highly integrating sensing and execution functions into a single component; it improves machining efficiency and surface quality by merging cutting and finishing; and it ensures the stability of the machining process through dual-threshold hysteresis control.

The application discloses an adaptive start-stop control method for an energy storage side converter of a light storage system, and relates to the technical field of light storage system control. The method aims to solve the problems of large standby loss and shortened service life of an energy storage device caused by the continuous operation of an energy storage side converter for maintaining the voltage of a direct-current bus in a direct-current coupling type light storage system. The method is applied to a light storage system in which an energy storage device is connected to a direct-current bus through a converter. A multi-dimensional joint criterion including a direct-current bus voltage stability criterion, an energy storage state of charge (SOC) safety constraint criterion and an optional supplementary criterion is constructed. In combination with hysteresis control logic, the converter is turned off when all the criteria meet the steady-state condition, and the converter is started when any criterion does not meet the condition. The adaptive start-stop of the converter is realized, the stability of the system is ensured, the loss is reduced, and the service life of the energy storage device is prolonged.

The application discloses a dynamic performance smoothing regulation method, system, medium and equipment for eMMC, relates to the technical field of embedded system storage management, and comprises the following steps: S1, real-time monitoring of the eMMC memory is carried out, the current storage filling rate F_fill of the eMMC memory is periodically acquired, then the environmental temperature T of the eMMC memory is acquired through a built-in temperature sensor, and finally the device life indication parameter L is acquired by querying from the eMMC memory; S2, the storage filling rate F_fill, the environmental temperature T and the device life indication parameter L acquired in the step S1 are input into a preset nonlinear frequency mapping model, and the target frequency is calculated; S3, based on the hysteresis control decision and the target frequency, the working clock frequency and mode of the eMMC memory are configured. The application has the characteristics of smoothness, the performance is smoothly attenuated with the increase of the filling rate, and step mutations do not occur; and the "ping-pong effect" is completely inhibited; the device life is effectively prolonged, and the application has the characteristics of high reliability.

The invention discloses a voltage comparator circuit, a chip and electronic equipment, and the voltage comparator circuit comprises a differential comparison circuit which is used for receiving an input voltage signal and a reference voltage signal, and outputting a differential signal based on the input voltage signal and the reference voltage signal; the output buffer circuit is connected with the differential comparison circuit and is used for outputting an output voltage signal of the voltage comparator circuit based on the differential signal; the hysteresis control circuit is connected with the output buffer circuit and the differential comparison circuit and is used for outputting an adjusting signal based on the output voltage signal so as to adjust the threshold voltage of the differential comparison circuit; and the clamping circuit is connected with the differential comparison circuit and is used for protecting the differential comparison circuit so as to prevent the differential comparison circuit from overvoltage breakdown. The voltage comparator circuit can bear dynamic high-voltage impact.

The invention provides a comparison circuit, a comparator and electrical equipment. A switch unit is arranged between a first signal input unit and a signal output unit and is used for adjusting the connection state between the first signal input unit and the signal output unit by changing the on-off state of the switch unit; when the switch unit is in an off state and the level of the second signal is greater than the level of the first preset signal, the switching unit switches the switch unit to an on state based on the control signal; when the switch unit is in the on state and the level of the second signal is smaller than the level of the second preset signal, the switching unit switches the switch unit to the off state based on the control signal; the level of the first preset signal is greater than that of the second preset signal; when the on-off state of the switch unit is switched, the second signal is firstly changed between the first preset signal and the second preset signal, and at the moment, the switch unit is still kept in the current on-off state, so that hysteresis control of output of the comparison circuit can be realized.

The invention discloses a self-adaptive ADB-bang-bang current sharing control method and system for multiple multi-phase buck-boost circuits connected in parallel, relates to the field of DC micro-grids, and solves the technical problem of circulating current caused by sampling deviation and inconsistent parameters when a plurality of DC-DC boost converters are connected in parallel. According to the invention, a PI controller with conditional integration is introduced into a voltage outer loop controller of each converter, so that the voltage error of each converter is obtained; a switching function is obtained, and when the switching function is not changed, integral and proportional links are normally carried out; when the function is switched on and off, the output of the integrator is reset, the integral link of each PI controller is automatically closed and reset, and the upper and lower limit thresholds of hysteresis control are changed on line in real time; the operation stability of the DC micro-grid can be improved.

The application provides a range extender control method based on battery temperature and pressure coupling, and belongs to the technical field of novel electric platform control. The method solves the problems of large battery SOC estimation error and inaccurate range extender control strategy under a large current working condition in the prior art. By collecting battery voltage, current, temperature and pressure information in real time, an initial SOC value is obtained based on ampere-hour integral method combined with voltage correction. A temperature-related battery parameter model is constructed to perform temperature compensation on the SOC. A correlation model between pressure and SOC is further established to perform secondary correction on the SOC. A battery multi-physical quantity coupling state evaluation model is constructed based on the final SOC estimation value, temperature, temperature change rate, pressure and pressure change rate. According to the evaluation result, a range extender layered control strategy is executed, including start-stop hysteresis control logic, power coordination control logic and safety protection control logic. Finally, the range extender start-stop state and output power are controlled to coordinate the energy distribution of the battery and the range extender. The application can significantly improve the battery SOC estimation accuracy under a large current working condition, optimize the range extender control strategy, and improve the battery pack safety and system stability.

The invention relates to the technical field of converters, and particularly provides a hysteresis-controlled bidirectional AC-DC converter and a control method thereof, and the method comprises the steps: obtaining a DC voltage and an AC voltage of the converter, and carrying out the calculation to obtain a minimum negative current; a pre-stage module controlled by hysteresis outputs a reference threshold value; inputting the alternating voltage of the converter into a logic driving module to obtain a first driving signal and a polarity logic control signal of the power frequency switch tube, and controlling the on-off of the corresponding power frequency switch tube through the first driving signal; and according to the polarity logic control signal, comparing a reference threshold value with the inductive current of the converter by using a rapid comparison module, determining a second driving signal of the high-frequency switch tube, and controlling the voltage of the corresponding high-frequency switch tube to be turned on after returning to zero, so as to solve the problem that in the related technology, the converter is in bidirectional energy interaction. And a high-frequency switching tube of the converter carries out high-frequency switching when the voltage is not zero, so that voltage and current peaks and high loss are caused.

The application discloses a kind of based on current optimization's switched reluctance motor torque ripple suppression method, it is related to motor control field.This method proposes a new current expression and establishes new current optimization model, phase current is expressed with a group of Fourier series coefficients and opening angle and conduction angle, make the root mean square of phase current be a fixed value, under the premise of not reducing motor torque current ratio, by optimization algorithm adjustment Fourier series coefficients and opening angle and conduction angle, and then optimize the phase current of each rotor position, obtain current root mean square utilization rate high and torque ripple low Theoretical optimal phase current waveform, by hysteresis control makes motor actual phase current waveform track theoretical optimal phase current waveform, reach the effect of torque ripple.This method has large optimization degree of freedom, and optimization variable is less, solve the problem that current root mean square utilization rate is not high when switched reluctance motor suppresses torque ripple, under the same output torque, torque ripple is low, copper consumption is small, and efficiency is high.

The present application belongs to the field of control of excimer lamps, and particularly relates to a control method and system of a multi-mode germicidal excimer lamp. The method comprises: acquiring real-time sampling values of lamp tube current and voltage of the excimer lamp, determining a current target working mode according to a preset germicidal strategy or external instruction; determining an aging characteristic factor by calculating a lamp tube instantaneous dynamic resistance and an equivalent impedance weighted average value, and combining a lamp tube aging two-dimensional lookup table, and correcting a current reference center line according to the aging characteristic factor; analyzing current ripple frequency domain characteristics, and calculating a dynamic bandwidth of hysteresis control through a preset multivariate function; determining a dynamic transition period when mode switching, so that the target values of the current reference center line and the dynamic bandwidth are smoothly transitioned; and generating a control signal by comparing the current with a dynamic threshold value, and controlling the on-off of a power switch tube. The present application effectively solves the defects of the existing driving control scheme of excimer lamps in aging adaptation, mode switching and bandwidth regulation.

The invention discloses a hysteresis current control method and system for a two-level grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: fixing the switching frequency of the converter through a frequency inner ring; generating a reference square wave and collecting a switch square wave; multiplying and accumulating the two in each control step length, and taking an accumulated value as a phase discrimination result at the rising edge of a switching period to finish switching phase discrimination; comparing a phase discrimination result with a phase reference value, and processing the phase discrimination result by a PI (Proportional Integral) controller; pI output is processed and then fed back to a frequency instruction, a phase outer ring is formed through a frequency-phase integral relation, and closed-loop control of a switch phase is achieved. The technical problems that a traditional hysteresis control switch is random in phase and multi-machine parallel ripple offset cannot be achieved are solved, the advantage of dynamic performance of hysteresis control is kept, meanwhile, accurate fixing of the switching frequency and the phase is achieved, the system performance is remarkably improved, and the application scene of the system is expanded.

The invention discloses a temperature control circuit with a hysteresis control function, and belongs to the technical field of temperature control. The circuit comprises a temperature acquisition module, a signal processing module, a hysteresis control module, an execution module, a power supply module, an optional display module and an alarm module, the temperature acquisition module acquires a real-time temperature signal, and the signal processing module amplifies and filters the real-time temperature signal to obtain a standard temperature signal; the hysteresis control module is used for comparing a preset first temperature threshold value and a preset second temperature threshold value with a standard temperature signal and outputting a control signal to drive the execution module to execute heating or stop heating operation; the power supply module supplies power to each module, the display module displays the temperature in real time, and the alarm module triggers alarm when the temperature exceeds a safety range. The circuit controls the temperature to change slowly through hysteresis, avoids frequent start and stop and repetition of an execution element, improves the temperature control stability and precision, has the characteristics of simple structure, adjustable threshold value, safety and convenience, and is suitable for temperature control scenes such as household appliances and industrial equipment.

The application belongs to the technical field of inverter switch control, and specifically discloses a three-level inverter switch frequency control method, device, medium and equipment. The method comprises the following steps: collecting the actual output current of the output end of the three-level inverter in real time; calculating the instantaneous error of the actual output current and the preset reference current; calculating the rising time and the falling time of the instantaneous error within the hysteresis width to obtain a natural switch period; comparing the actual output current of the output end of the three-level inverter with a set threshold to determine whether the three-level inverter enters an active frequency conversion adjustment mode; and when the active frequency conversion adjustment mode is entered, taking the natural switch period as a reference, dynamically setting the turn-on time and the turn-off time to generate a controlled switch period, so that the active adjustment of the switch frequency of the three-level inverter is realized. By adopting the segmented frequency conversion hysteresis control, the application can improve the operation reliability of the three-level inverter and prolong the service life of the power device.

The invention belongs to the technical field of inverter switching control, and particularly discloses a three-level inverter switching frequency control method and device, a medium and equipment, and the method comprises the steps: collecting the actual output current of the output end of a three-level inverter in real time; calculating an instantaneous error between the actual output current and a preset reference current; calculating rising time and falling time of the instantaneous error in the hysteresis width to obtain a natural switching period; the actual output current of the output end of the three-level inverter is compared with a set threshold value so as to judge whether the three-level inverter enters an active frequency conversion adjusting mode or not; and when the three-level inverter enters the active frequency conversion adjusting mode, the natural switching period is taken as a reference, and the turn-on time and the turn-off time are dynamically set, so that a controlled switching period is generated, and active adjustment of the switching frequency of the three-level inverter is realized. According to the three-level inverter, the operation reliability of the three-level inverter can be improved and the service life of a power device can be prolonged by adopting segmented variable-frequency hysteresis control.

The invention relates to a time-sharing hybrid control system based on hysteresis control and PI control, and relates to the technical field of current control. The device comprises a power supply power unit and a control unit. The power supply power unit comprises a power distribution soft start module, a high-voltage module, a low-voltage module and a current feedback module. The control unit is provided with a sequential control and fault protection module, an error amplifier, a hysteresis control module and a PI controller. The current feedback module is used for outputting feedback current and sending the feedback current to the error amplifier, error current is generated after the feedback current is compared with external instruction current, and the error current is sent to the hysteresis control module and the PI controller at the same time. And the hysteresis control module dynamically controls a switch of the high-voltage module according to the error current, and activates the PI controller through a stable enable signal when the system is stable. And the PI controller outputs a PWM signal to finely adjust the low-voltage module. The method has the effects of fast dynamic response and high steady-state precision performance at the same time.

The invention discloses a hysteresis current control method and system for a fixed-frequency grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: calculating single-cycle variation and influence quantity of voltage, current instruction and hysteresis width of a power grid; calculating a frequency loop compensation gain according to the converter topology; actual switching frequency is detected and compared with an instruction value, and a ring width control instruction is generated through a PI controller; and an actual loop width instruction is obtained by combining the compensation gain, and constant switching frequency control is realized. According to the invention, through multivariable compensation and closed-loop control, the influence of power grid voltage fluctuation, current instruction change and hysteresis width adjustment on the switching frequency is effectively suppressed, the problem of unstable switching frequency of traditional hysteresis control is solved, the advantage of fast dynamic response of hysteresis control is retained, accurate and stable control of the switching frequency is realized, and the switching efficiency is improved. The method is suitable for two-level and three-level converter topologies, and has important engineering application value.

The invention discloses a hydrogen fuel cell engine auxiliary power control system, which relates to the technical field of intelligent control, comprises a simulation module, a compensation module and a control module, constructs a non-interference temperature model, calculates the weight of an interference parameter, obtains a first temperature model, constructs a hysteresis regulation and control model, and presets the output temperature. A non-interference temperature model is constructed, a theoretical basis is provided for subsequent compensation and control, the weight of interference parameters is calculated, uncertainty and interference in actual operation are effectively dealt with, a hysteresis regulation and control model is constructed, output temperature is pre-set, the stability and response speed of the system are improved, and through the combination of simulation and compensation modules, the stability and response speed of the system are improved. The system can predict and adjust the temperature more accurately, errors caused by interference are reduced, frequent fluctuation of the temperature is effectively reduced through application of the hysteresis regulation and control model, and the system is kept stable under the dynamic condition.

The invention discloses a method and a system for dynamically adjusting a DCDC power supply of a new energy automobile, and relates to the technical field of power supply adjustment. The method comprises the steps of establishing a time reference consistent with a control period, synchronously collecting and updating a sliding window, performing window preprocessing and working condition recognition, generating comprehensive scheduling parameters, performing parameter layer adjustment based on the comprehensive scheduling parameters, performing vehicle type level parameter centralized management and online correction, performing abnormal trigger protection, performing grading derating and performing safety disposal. Through unification of time marks and complete sets of data, lightweight scheduling parameter driving, segmented compensation penetration and threshold hysteresis control, sudden change response acceleration, cross-temperature zone consistency improvement, stability and thermal safety collaboration and reduction of mass production operation and maintenance cost are realized.

This invention discloses a temperature detection and protection circuit, a PCB board, and a controller, including a temperature detection unit. The output terminal of the temperature detection unit is connected to the input terminal of a voltage comparison unit, the output terminal of the voltage comparison unit is connected to the input terminal of an output drive unit, the output terminal of the output drive unit is connected to the input terminal of a hysteresis control unit, and the output terminal of the hysteresis control unit is connected to the temperature detection unit. The voltage comparison unit compares the temperature voltage signal with a reference voltage signal and sends a drive signal to the output drive unit based on the comparison result. The output drive unit amplifies the drive signal. The hysteresis control unit switches the temperature detection path of the temperature detection unit according to the drive signal. The temperature signal is converted into a current signal, and then into a voltage signal. The amplitude is compared with a standard reference voltage to determine whether an overheating situation has occurred, and the overheating shutdown and cooling recovery functions are achieved by utilizing the hysteresis characteristics.

The invention provides an LVR evaporation system control method and system based on an intelligent algorithm, and relates to the field of low-vacuum reboiler control. According to the method, temperature sensors, vacuum pressure sensors, conductivity sensors, turbidity sensors and liquid level sensors are arranged on an evaporator, a circulating pipeline and a vacuum system, and a scaling risk state sensing model is constructed; calculating a supersaturation index SI based on the acquired signal and soft measurement, and judging and identifying a metastable or critical deposition working condition through a threshold value; performing risk level classification on the multi-dimensional state vector by using a reinforcement learning algorithm (PPO), and outputting risk confidence and a trigger signal; after the risk is triggered, bypass induced nucleation is realized through PID shunt control, and the shunt proportion, the bypass temperature difference and the stirring intensity are accurately adjusted; meanwhile, a strategy optimization module is introduced, and self-adaptive updating of a control strategy is achieved through a return function and an online training mechanism; and finally, long-period stable operation and low scaling rate of the evaporation system are realized through hysteresis control and an energy consumption self-optimization mechanism.

The invention discloses a control method of an ISOP type seabed direct-current converter system based on LLC. The control method comprises the steps that the total input voltage of the system and the input and output voltage of each converter are acquired; equally dividing the total input voltage to each converter to obtain an equally divided voltage of each converter; comparing the input voltage of each converter with the average voltage, and performing PI control to obtain first data of each converter; comparing the output voltage of each converter with a preset reference value to obtain a deviation value of each converter; inputting the deviation value into an output voltage loop PI controller of phase shift control and frequency conversion control, and superposing the output of the controller with the first data to respectively obtain second data and third data; carrying out hysteresis control on the input voltage of each converter to obtain fourth data of each converter; and when the fourth data is smaller than the preset switching voltage, controlling the converter according to the third data in combination with pulse frequency modulation, otherwise, adjusting a carrier phase-shift angle according to the second data to control the converter.

This invention discloses a high-current BUCK converter and its control method that support automatic switching between single-channel output and dual-channel parallel output. The BUCK converter includes a first output channel, a second output channel connected in parallel with it, and a control module. The control module acquires the load state by collecting inductor current signals and automatically controls the enabling or disabling of the second output channel according to the load size, thereby adaptively switching between single-channel output mode and dual-channel parallel output mode. Under light or medium load conditions, only the first output channel is enabled to reduce static power consumption and drive losses; under heavy load conditions, the first and second output channels are connected in parallel to share the output current and reduce current stress on power devices. This invention can also combine PFM and PWM modulation methods and suppress mode jitter through hysteresis control, thereby achieving high-efficiency and high-reliability power conversion over a wide load range, suitable for high-current power management chip applications.

The invention belongs to the technical field of power factor correction, and particularly relates to a bridgeless PFC control system and method based on model predictive control and hysteresis control. The system comprises an output voltage sensor, a PI voltage controller, an input voltage sensor, a reference current generation module, a given triangular wave, a fixed frequency control module, an inductive current sensor, an inductive current error value module, a model prediction control module and a hysteresis comparison module. Subtracting the value obtained by the output voltage sensor from a reference value, and inputting the difference into a PI voltage controller to generate a reference current; obtaining a total inductive current actual value by superposing the currents of the two inductors, obtaining a current deviation value by subtracting the total inductive current actual value from a final reference current, and generating a hysteresis width by means of a model prediction control module; the current deviation value and the hysteresis width are sent to a hysteresis comparison module, and a switching action decision is output to drive a power device; the dynamic response speed of the system can be improved, the power factor is ensured, and the robustness of the system is enhanced.

The invention belongs to the technical field of motor control, and discloses a space vector pulse width modulation method and system of a multi-level series winding topology. The method comprises the steps that three-phase stator current is collected, three-phase stator voltage is reconstructed, and the rotating speed and angle of a motor are obtained; performing Clark transformation on the three-phase stator current to obtain an alpha-beta-gamma component, determining the amplitude, angle and spatial position of a reference voltage vector, and dividing a three-level inverter switching vector into 36 small triangular region positioning reference vectors; three nearest basic voltage vectors are selected, and action time is calculated according to an amplitude-second balance principle to generate a PWM (Pulse-Width Modulation) waveform; a direct-current bus double-capacitor voltage difference value is collected, and the duty ratio is corrected in combination with the duty ratio and three-phase stator current hysteresis control; and converting the corrected duty ratio into a PWM signal to drive a motor. The DC bus voltage utilization rate can be improved, output harmonic waves are reduced, the waveform quality is improved, and the DC capacitor voltage balance capability and the system stability are enhanced.