54 results about "Space vector pwm" patented technology

The invention provides a power distribution network single-high-frequency resonance rapid tracking and adaptive suppression method, a multi-mode dynamic cooperative adaptive suppression system is established based on a PCCVF adaptive method, and the damping characteristics of a power distribution network are remodeled by injecting compensation current into a power distribution network system so as to realize broadband resonance suppression of the power distribution network. The compensation current injection method comprises the following steps: step 1, detecting resonant frequency deviation of a power distribution network through real-time FFT (Fast Fourier Transform); 2, performing dynamic phase angle correction based on a phase prediction residual error of real-time frequency deviation; step 3, constructing a layered impedance remodeling module, and ensuring stable power transmission; 4, establishing a frequency-variable impedance model of the power distribution network based on resonance energy spectral density analysis, dynamically optimizing parameters through fuzzy logic of a bell-shaped membership function, and feeding harmonic compensation current into the power distribution network by using a space vector pulse width modulation technology; according to the invention, single high-frequency resonance can be effectively suppressed, the response and tracking performance of the system is improved, and the spectrum analysis efficiency and bandwidth occupation are optimized.

The invention discloses a permanent magnet synchronous motor wide speed range model prediction control method and system based on a mean value reduction optimization algorithm, and belongs to the technical field of motor control. According to the method, a discrete mathematical model of the permanent magnet synchronous motor is established under a d-q rotating coordinate system, a q-axis current reference value is generated by an outer ring through a speed PI regulator, and a d-axis current reference value is calculated in combination with a maximum torque per ampere (MTPA) principle and a weak magnetic region voltage constraint; finite control set model prediction control is adopted in an inner ring, enumeration prediction is conducted on candidate voltage vectors of the three-phase voltage source type inverter, a cost function containing a d-axis current error, a q-axis current error and an electromagnetic torque error is constructed, an optimal voltage vector is selected, and a three-phase PWM signal is generated through space vector pulse width modulation to drive a motor. The system is provided with a mean value reduction optimization module, joint optimization is carried out on speed outer ring PI parameters and cost function weight coefficients in the off-line stage, the parameters are stored in a lookup table, and automatic setting of control parameters is achieved. The permanent magnet synchronous motor can improve the dynamic response performance of the rotating speed and the current in the base speed area and the weak magnetic area, reduce the total harmonic distortion of the stator current, improve the voltage utilization rate and the overall operation efficiency of the permanent magnet synchronous motor, and is suitable for occasions such as electric vehicle driving and high-performance servo systems.

The invention relates to a model prediction fault-tolerant control method and system for a dual three-phase permanent magnet synchronous motor, and the method comprises the steps: estimating the lumped disturbance in the operation process of the motor in real time based on an extended state observer, and carrying out the feed-forward compensation of the reference voltage of the motor according to the lumped disturbance information; and based on the compensated voltage reference value, constructing a dynamic voltage vector set and correcting an initial voltage vector set, searching an optimal voltage vector in the dynamic voltage vector set, and driving the motor through three-phase decoupling space vector pulse width modulation. According to the field loss fault-tolerant control strategy designed by the invention, phase current harmonics caused by local field loss faults of the dual three-phase permanent magnet synchronous motor can be effectively suppressed, and the steady-state precision and the dynamic response capability of the system under the local field loss faults are enhanced.

The invention discloses a permanent magnet synchronous motor parameter identification method, device and equipment and a storage medium, and relates to the technical field of motor parameter tuning, and the method comprises the steps: constructing a voltage equation model under a synchronous rotating coordinate system under a field oriented control (FOC) frame, and injecting a sweep frequency signal to a d-axis voltage Ud and a q-axis voltage Uq of a permanent magnet synchronous motor; converting the sweep frequency signal into a three-phase PWM waveform through Park inverse transformation and space vector pulse width modulation, and applying the three-phase PWM waveform to a three-phase winding of a motor stator; three-phase current of a stator is collected, and d-axis current Id and q-axis current Iq are obtained through Clark conversion and Park conversion; fourier transform is carried out on the input sweep frequency signal and the output current signal, a time domain signal is converted into a frequency domain signal, and amplitude frequency and phase frequency data of the input signal and the output signal are obtained; and establishing an objective function based on amplitude-frequency and phase-frequency data, performing iterative optimization solution on the stator resistance Rs, the d-axis inductance Ld and the q-axis inductance Lq by using a genetic algorithm, and outputting an optimal parameter identification result.

The invention discloses an inverter control method and energy storage equipment. The inverter control method comprises the following steps: acquiring the output power of an inverter; determining a modulation mode of the PWM signal according to the output power; the modulation mode of the PWM signal comprises a discontinuous pulse width modulation mode and a space vector pulse width modulation mode; determining a switching frequency parameter of the inverter according to the modulation mode of the PWM signal; the switching frequency parameter comprises at least one of a switching frequency jitter depth, a switching frequency jitter mode and a switching frequency updating speed; a PWM signal is generated based on the switching frequency parameter. The EMC performance of the inverter is comprehensively improved, and the robustness is higher. And meanwhile, the efficiency of the inverter is improved, the dependence on a large-size and high-cost EMI filter is reduced or simplified, the implementation and upgrading are easy, and integration in a product and optimization on site through fixed upgrading are facilitated. And the compactness of the overall structure of the inverter is improved, and the power density of a power system is improved.

The present invention relates to the field of (digitally controlled) electric motors, (digital) control systems, (electric) motor-based systems, including those (digital) control systems, and methods relating thereto. The present invention addresses the complexity of dynamic switching between two or more different modulation algorithms, such as SVPWM (Space Vector Pulse Width Modulation), SPWM (Sinusoidal Pulse Width Modulation), THIPWM (Third Harmonic Pulse Width Modulation), DPWM (Discontinuous Pulse Width Modulation), OPP (Optimized Pulse Pattern).

The application belongs to the technical field of electric machines, and discloses a magnetic suspension fan variable frequency driving device and a harmonic suppression method; the method comprises the following steps: judging a transient operation process and activating a phase compensation mechanism by monitoring the state of the electric machine in real time, extracting harmonic components in real time and updating a weight vector to obtain harmonic currents of different orders; meanwhile, a phase compensation amount is dynamically obtained based on a pre-built control loop phase lag atlas, an anti-phase harmonic voltage is calculated in combination with the harmonic currents and the compensation phase, and the variable frequency device is injected through a space vector pulse width modulation method to realize accurate harmonic cancellation; torque safety monitoring is also independently operated in parallel in the whole process, the electromagnetic torque and its change rate are detected in real time to perform safety logic determination, and a protection action is triggered when the limit is exceeded; the application can realize accurate cancellation of anti-phase harmonics and actual interference harmonics in the transient process, significantly reduce the instantaneous impact of the electromagnetic torque, and effectively improve the operation stability and reliability of the magnetic suspension fan variable frequency driving system under transient working conditions.

The invention discloses a reluctance motor control method and system based on three-dimensional model parameter observation. A simplified voltage equation of the motor under a synchronous rotation dq0 coordinate system is constructed. Then, a linear expansion state observer is designed based on the equation, d-axis current, q-axis current and 0-axis current are predicted respectively, and errors between the predicted current of each axis and actual sampling current are calculated; current errors exceeding a preset threshold value are equivalent to lumped disturbance, and an independent closed-loop disturbance adjusting system is constructed for a to-be-corrected shaft for self-correction. And the corrected parameters are updated to the prediction model in real time, and dq0-axis reference voltage enabling the current to track the reference value is calculated in combination with a dead-beat prediction current control strategy. And finally, generating a driving signal through coordinate inverse transformation and space vector pulse width modulation. According to the method, the three-dimensional current structure of the motor is fully utilized, and the current prediction precision and the control robustness under parameter change and complex working conditions are effectively improved under the condition that additional signal injection is not needed.

The application discloses a high-dynamic position filtering method for a permanent magnet motor system, comprising the following steps: a second-order system model is established based on a mechanical motion equation of a permanent magnet synchronous motor; a third-order extended state observer is designed, and the position, the speed and the total disturbance are estimated simultaneously; in the position controller, the estimated rotor position output by the observer is selected as the feedback signal of the position controller, the high-frequency noise suppression capability is improved while the high dynamic performance of the system is ensured; a position-speed cascade controller is constructed, the estimated total disturbance is used for real-time feedforward compensation of a torque instruction, and a final electromagnetic torque reference instruction is generated; and the electromagnetic torque reference instruction is input into a current controller and a space vector pulse width modulation module to drive the permanent magnet synchronous motor to operate. The application solves the limitations of poor filtering performance or phase lag of the feedback signal of the existing scheme, and improves the control bandwidth and dynamic response performance of the system.

The invention relates to the technical field of permanent magnet motor control, and discloses a permanent magnet motor rotor position identification control method comprising the following steps: setting a permanent magnet motor rotor position initial value, and using the initial value as an identification reference; the stator current of the permanent magnet motor is controlled based on space vector pulse width modulation, so that the motor operates at a preset rotating speed; the real-time information of the rotor position is obtained by detecting the amplitude and phase of the stator current of the permanent magnet motor; based on the real-time information, a fuzzy neural network is adopted to identify the rotor position, and a rotor position estimation value is obtained; carrying out filtering processing on the identification position; the identification position is a rotor position estimation value; outputting an identification result of the rotor position, and performing closed-loop control on the permanent magnet motor; through fusion of SVPWM current control and FNN nonlinear modeling, the problem of weak back electromotive force signals in a low-speed section is solved, and position identification errors are effectively reduced.

The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a permanent magnet synchronous motor performance control method and related equipment, and the method comprises the steps: constructing a permanent magnet synchronous motor driving system model into three associated subsystems, a q-axis current reference value is generated through a sliding mode proportional-integral (PI-SMC) controller, and rotating speed outer ring robust control is achieved; the second subsystem adopts a PI-SMC controller to carry out closed-loop control on d-axis current and outputs a d-axis voltage reference value; and the third subsystem performs closed-loop control on the q-axis current by using the PI-SMC controller and outputs a q-axis voltage reference value. And the d / q-axis voltage is subjected to Park inverse transformation and a space vector pulse width modulation algorithm to generate an IGBT switching pulse signal, and finally the motor is driven to operate. According to the model, the anti-interference performance of the system is improved through a layered sliding mode control strategy, and high-precision torque and rotating speed control is achieved.

A method of implementing a space vector pulse width modulation scheme. The method includes: mapping switching states for an n-phase, where n is an integer, multi-level inverter onto a two-dimensional hexagonal space vector diagram; identifying redundant vectors in the space vector diagram and removing redundant vectors associated with a common mode voltage current contribution of more than a predetermined threshold; identifying a location in the space vector diagram of a voltage reference vector; identifying a sector of the space vector diagram defined by four vectors within which the voltage reference vector is located; and determining duty cycles and switching states associated with the four vectors to synthesise the voltage reference vector.

The application provides a linear active disturbance rejection control method and a control system of an energy storage converter, the linear active disturbance rejection control method comprising: calculating instantaneous active power and reactive power according to grid voltage components and converter current components; obtaining dq-axis current reference values after adjusting output by a proportional-integral controller after obtaining active power error signals and reactive power error signals; inputting the dq-axis current reference values and the converter current components into a fuzzy neural network, the fuzzy neural network adjusting bandwidth parameters of a linear active disturbance rejection controller through a process of fuzzification, fuzzy reasoning and defuzzification; performing inverse Park conversion on dq voltage instructions output by the linear active disturbance rejection controller to obtain voltage instructions in an alpha-beta coordinate system, and generating PWM signals for driving power switching tubes of the energy storage converter through a space vector pulse width modulation technology based on the voltage instructions. The application solves the technical problems of poor robustness of a conventional PI control and insufficient work condition adaptability of a fixed parameter linear active disturbance rejection control.

The present invention discloses a method for suppressing speed fluctuations in a gas turbine generator set, comprising: real-time measurement of key parameters of a synchronous generator; performing speed feedforward compensation control to obtain a voltage control deviation ΔU, which is then input into the voltage control link; coordinate-shifting the output current value of the synchronous motor to form the actual value of a control signal; performing current feedback control based on the voltage control parameters obtained through the speed feedforward compensation control; and achieving speed regulation through space vector PWM control. Based on a dual-loop closed-loop control method of voltage and current, the present invention utilizes the speed fluctuation value of the gas turbine as a speed feedforward compensation signal and adds a voltage loop instruction. By altering the output characteristics of the DC voltage system, the method can reduce the generator speed fluctuation range when the generator load suddenly changes, achieve speed stability in a relatively short period of time, thereby suppressing generator speed fluctuations and reducing hardware costs.

The application is suitable for the technical field of motor control, and provides a servo motor control method based on reinforcement learning, which comprises the following steps: obtaining three-phase stator currents during the operation of a target motor, and converting the three-phase stator currents to obtain a first current component and a second current component, wherein the first current component is used to represent a control reference of the rotor flux of the target motor, and the second current component is used to represent the torque output capability of the target motor; comparing the first current component and the second current component with preset reference values respectively to obtain error data; obtaining compensation data for the target motor, and inputting the error data and the compensation data into a preset reinforcement learning network to obtain a first voltage instruction and a second voltage instruction; determining a three-phase voltage waveform according to the first voltage instruction and the second voltage instruction through a space vector pulse width modulation algorithm, and then controlling the target motor according to the three-phase voltage waveform.

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

The present invention discloses a control method based on the slewing system of vehicle-mounted equipment, belonging to the technical field of PID control optimization. The specific steps are as follows: Step 1, construct a PID control model based on the slewing system of vehicle-mounted equipment, including an improved dung beetle optimization algorithm model, a permanent magnet synchronous motor control model, a PID controller, a space vector pulse width modulation model, and an observer model; Step 2, improve the dung beetle optimization algorithm, and the specific implementation is: D1, use the boundary reflection method to handle the problem of the position of dung beetle individuals exceeding the boundary; D2, introduce the successful experience of learning other dung beetles during the stealing process of dung beetles, and guide the stealing behavior through the historical optimal position; Step 3, use the improved dung beetle optimization algorithm to optimize the current inner-loop PID controller of the permanent magnet synchronous motor control system to obtain the optimal Kp, Ki, and Kd control parameters of the current inner-loop PID controller; Step 4, use MATLAB to carry out modeling and simulation for the control of the vehicle-mounted equipment slewing system.

The present invention relates to a control method which can perform, although a line-to-ground fault occurs in phase 1, coordinate transformation to separate the line-to-ground fault of phase 1 without unnecessary power outage by utilizing remaining normal phases, and apply transformed space vector pulse width modulation (SVPWM) to the converted coordinates, and the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of controlling space vector pulse width modulation (SVPWM), which applies zero voltage to ground-faulted phase 1 and makes an inverter operate normally with only the remaining sound phases in order to prevent unnecessary loss generated as even other sound phases are blocked when a single line-to-ground fault occurs. According to the device, method, and computer program of the present invention for controlling space vector pulse width modulation using a 3-phase 4-leg inverter under a single line-to-ground fault in an islanded microgrid, since available voltage switching vectors are limited as phase 1, in which a line-to-ground fault has occurred, and phase n are restricted to have the same switching state, a novel coordinate transformation may be performed to compensate for the distortions generated therefrom, and since a novel space vector pulse width modulation (SVPWM) method that can be appropriately applied to the transformed coordinates can be provided, the problem of inducing loss of power and reducing the life of devices by unnecessarily cutting off even the sound phases can be solved even when a line-to-ground fault occurs.

This application discloses a microgrid oscillation suppression control method and system based on an adaptive static-dynamic model. The method includes: predicting the DC-side capacitor voltage, AC-side three-phase capacitor voltage, and AC-side three-phase inductor current values ​​at the next time step based on the values ​​collected at the current time; using the deviations of the predicted DC-side capacitor voltage, AC-side three-phase capacitor voltage, and AC-side three-phase inductor current values ​​from their expected values ​​as control targets, and establishing a control objective function by combining the weights of each control target calculated according to an adaptive weight function; and using a zero-voltage vector injection modulation method to modulate the voltage vector output by the control objective function to achieve fixed-frequency control. This application adds a DC-side control objective to the model predictive control and uses an adaptive objective function to evaluate the objective function to obtain the optimal voltage vector, and then uses space vector pulse width modulation to obtain the corresponding switching transistor states.

The invention relates to the technical field of motor control, in particular to a power device locked-rotor junction temperature optimization control method and device and a storage medium, and the method comprises the steps: responding to a preset locked-rotor judgment condition, and obtaining working condition parameters which comprise a current vector sector and a bus voltage; determining a duty ratio compensation value according to the working condition parameters and a mapping relation, wherein the mapping relation is used for representing a corresponding relation between the working condition parameters and the duty ratio compensation value; and superposing the duty ratio compensation values to three-phase original duty ratios output by space vector pulse width modulation to generate compensated three-phase duty ratio signals, and outputting the compensated three-phase duty ratio signals to an inverter driving circuit. On the premise of not changing the output torque of the motor, the maximum junction temperature under the locked-rotor working condition can be effectively reduced by balancing the heat distribution of the power device, so that the locked-rotor current output capability is improved under the condition of meeting the same thermal safety constraint, or the power device with a lower specification is allowed to be adopted to optimize the system cost.

The invention discloses a permanent magnet synchronous motor predictive current control method for improving a sliding-mode observer and an overmodulation scheme. The method comprises the following steps: S1, establishing a hyper-local mathematical model of a motor under a synchronous rotating coordinate system; s2, constructing a sliding-mode observer SMO, and introducing a sliding-mode reaching law of a variable exponential term to carry out real-time estimation on current and disturbance; s3, extracting and compensating fifth-order and seventh-order harmonics in the motor current, obtaining harmonic current components through multi-synchronous rotating coordinate system transformation, calculating harmonic compensation voltage through closed-loop feedback, and further generating a final modulation signal; and S4, judging whether the modulation signal is in an overmodulation region or not, and outputting a PWM driving signal to an inverter to control the operation of the permanent magnet synchronous motor by adopting an overmodulation strategy based on carrier PWM combined with zero sequence signal injection in the overmodulation region, which is equivalent to a minimum amplitude error method in space vector PWM. The method has comprehensive advantages in the aspects of steady-state precision, dynamic response, parameter robustness and over-modulation region performance.

The invention relates to a permanent magnet synchronous generator rectification system and a direct current voltage stabilization control method thereof. By constructing a dynamic load feed-forward compensator, dynamic feed-forward compensation is carried out on a disturbance term of the self-adaptive super-spiral sliding mode, the bus voltage recovery time is effectively shortened, and the voltage fluctuation amplitude is reduced. Meanwhile, according to the designed self-adaptive super-spiral sliding mode voltage closed-loop controller, a sign function is replaced by a continuous function, an improved self-adaptive super-spiral control law is constructed, and system buffeting is effectively reduced. On the basis of space vector pulse width modulation, the designed direct current bus current observer deduces the relation between the phase current and the bus current, the bus current is reconstructed, and reliable current observation information is provided for a dynamic load feed-forward compensator.

The invention relates to the field of household appliances, and provides a fan anti-interference method and device, and the method comprises the steps: obtaining a motor speed, a motor quadrature-axis current and a motor direct-axis current; according to the motor speed, the preset speed and the motor quadrature-axis current, utilizing proportional integral operation and torque limitation to obtain motor quadrature-axis voltage; obtaining a motor direct-axis voltage according to the motor direct-axis current and a preset motor direct-axis current; according to the motor quadrature-axis voltage and the motor direct-axis voltage, the duty ratio of the inverter is obtained through Parker inverse transformation and space vector pulse width modulation, and the inverter is controlled according to the duty ratio. According to the method, the problems of high anti-interference cost and poor universality of the fan are solved, noise interference is effectively suppressed, stable operation of the fan is ensured, additional cost does not need to be increased, and the universality is high.

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.

This invention relates to the technical field of permanent magnet synchronous motor (SPMSM) control. Specifically, it provides a sensorless control method for SPMSM based on AVE-HOTSMO. The method includes: obtaining stator current and stator voltage; establishing an SPMSM mathematical model with stator current and SPMSM back EMF as extended states; constructing a higher-order terminal sliding mode surface; constructing current-side correction injection terms and back EMF-side correction injection terms; constructing an adaptive variable-exponential higher-order terminal sliding mode observer AVE-HOTSMO to obtain stator current estimates and SPMSM back EMF estimates; inputting the SPMSM back EMF estimates into a quadrature phase-locked loop (QLL); and executing field-oriented control and space vector pulse width modulation (SVM) to control SPMSM operation. This invention solves the problem of traditional sliding mode observers and fixed-parameter higher-order terminal sliding mode observers struggling to balance fast convergence, chattering suppression, and robustness under complex operating conditions.

The invention provides a dual-random control method and system combining a dual-three-phase motor random switching sequence and a random carrier frequency. When a dual three-phase motor adopts space vector pulse width modulation, concentrated high-frequency harmonic waves exist at the switching frequency and the integral multiple of the switching frequency of phase current, and vibration noise is caused. The invention provides a double-random control method for a double-three-phase motor to suppress high-frequency harmonic waves, two different switch sequences are designed in each sector, and one switch sequence is selected through random numbers in each carrier period. And in the aspect of random carrier frequency, random number constrained variable delay control is provided, so that the carrier period is randomized, the high-frequency harmonic amplitude of the dual three-phase motor is finally reduced, and the vibration and noise of the motor are suppressed.

The invention particularly relates to a rail transit train regenerative braking energy inversion feedback control method, and belongs to the technical field of rail transit control. A two-phase static coordinate system enhanced phase-locked loop is adopted to obtain the phase and frequency of a to-be-connected power grid in the braking process of a rail train, and then the on-off state of a three-phase bridge arm of a two-level three-phase inverter is controlled in real time by adopting a space vector pulse width modulation algorithm according to the phase and frequency of the to-be-connected power grid. Therefore, the frequency and the phase of the alternating current converted by the two-level three-phase inverter are consistent with the frequency and the phase of the to-be-connected power grid, the impact of the inverted alternating current on the to-be-connected power grid is reduced, and the inversion quality of the braking energy of the rail train is greatly improved. According to the invention, after the switching state of the two-level three-phase inverter is controlled, the LCL filtering is added, so that the harmonic influence caused by a switching signal generated by a space vector pulse width modulation algorithm is reduced, and the grid-connected safety of the inverter current is improved.

The invention relates to the technical field of motor driving and industrial automation control, in particular to a synchronous control system of gearless double permanent magnet air compressor motors, comprising a data acquisition module used for acquiring rotor absolute space angles and phase currents of a first motor and a second motor; the vector analysis module is used for performing coordinate transformation analysis on the phase current to obtain current quadrature-axis current and current direct-axis current; the space domain feed-forward observation module is used for converting the current into a first feed-forward current instruction corresponding to the first motor and a second feed-forward current instruction corresponding to the second motor; the cross coupling control module is used for converting the synchronization error into a first compensation current and a second compensation current in combination with a self-adaptive weight coefficient which is calculated in real time based on the running state of the motor; the synchronous execution module is used for generating a voltage instruction and generating a driving signal through space vector pulse width modulation; according to the invention, sharp sudden change of the single-side torque is avoided, and high-synchronization rigidity control under low current fluctuation is realized.

The present application relates to the technical field of three-phase motor driving, and particularly relates to a three-phase four-bridge-arm impedance source inverter topology control method, structure and system. The method comprises the following steps: in response to a preset DC bus voltage boosting request, if the three-phase motor has not entered a preset open-phase fault state, the upper bridge arm and the lower bridge arm of the redundant bridge arm are turned on, and a preset two-dimensional space vector pulse width modulation strategy is used to control the three-phase bridge arm, so that a shoot-through zero vector is only applied to the redundant bridge arm, thereby improving the voltage of the DC bus within the zero voltage vector action time and the non-zero voltage vector action time of the three-phase bridge arm; in response to the three-phase motor entering the open-phase fault state, a preset three-dimensional space vector pulse width modulation strategy is used to control the three-phase bridge arm and the redundant bridge arm, so as to realize current compensation through the redundant bridge arm and achieve open-phase fault-tolerant operation of the three-phase motor.

The invention relates to a dead-beat model prediction control method and system for a magnetic flux adjustable motor, and the method comprises the steps: sampling a three-phase stator current of the motor, and converting the three-phase stator current to obtain a dq-axis current; detecting the number of magnetism-adjusting positive and negative pulses through a magnetism-adjusting pulse counting module, and correcting the flux linkage value of the permanent magnet; establishing a current state equation containing parameter mismatch disturbance; an expansion state observer is constructed based on the adaptive bandwidth of the current error and used for estimating disturbance and observing the current in real time; inputting the estimated disturbance, the corrected flux linkage value and the observation current into a dead-beat prediction model, and calculating a compensated dq-axis voltage; and the compensated dq-axis voltage is subjected to inverse dq transformation to obtain a voltage under a static coordinate system, and then a switching signal of an inverter is generated through space vector pulse width modulation to control the operation of the magnetic flux adjustable motor. According to the method, the robustness of the system to parameter disturbance and flux linkage change is improved, the control precision and stability are enhanced, and hardware cost does not need to be increased.