32 results about "Space vector pwm" patented technology

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 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 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 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.

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 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 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 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.

The application provides a space vector pulse width modulation method of a two-phase four-bridge-arm inverter and a related device, and belongs to the technical field of power electronics. According to the sector where a reference output voltage vector is located, the application determines the selected switch tube state, switch tube switching sequence and switch tube state duration by judging the action time of the adjacent voltage vector and the action time of the zero voltage vector of the sector where the reference voltage vector after equal proportion shortening is located. According to the selected switch tube state, switch tube switching sequence and switch tube state duration, the driving signal for controlling the switch tube state switching is generated to control the on-off of each switch tube of the two-phase four-bridge-arm inverter. The application solves the problems of the prior art, such as complex calculation process, frequent switch tube state switching and too small utilization rate of the direct current voltage.

The application discloses a motor driving method and device, a motor system and a storage medium. The method comprises the following steps: obtaining three-phase current values, three-phase voltage values and a rotating speed of a motor after starting the motor; performing Clark transformation on the three-phase voltage values of the motor to obtain measured values of alpha and beta axis stator voltage components; determining command values of the alpha and beta axis stator voltage components of the motor according to the three-phase current values, the rotating speed and the measured values of the alpha and beta axis stator voltage components; determining alpha and beta axis voltage values of the motor by using a preset quasi-proportional resonant controller based on the measured values of the alpha and beta axis stator voltage components and the command values of the alpha and beta axis stator voltage components; and driving the motor to operate after the alpha and beta axis voltage values of the motor are subjected to space vector pulse width modulation and then are subjected to inversion by an inverter. According to the scheme, the current harmonic existing at present is suppressed by using the quasi-proportional resonant controller, and the operation performance of the motor is improved.

The application discloses a minimum loss control method and device of a permanent magnet synchronous motor based on a vector magnetic circuit law. The method comprises the following steps: an accurate dynamic model of the permanent magnet synchronous motor considering core loss is established; a loss equation of the permanent magnet synchronous motor under the condition of considering core loss is obtained from the model, and then the loss equation is combined with a torque constraint condition to form a loss criterion F which can reflect the loss of the permanent magnet synchronous motor; the d and q axis current reference values are obtained by solving the loss criterion F through the Lagrange multiplier method; then the d and q axis current reference values are input into a proportional integral (PI) controller to output reference voltage by adjusting the error between the actual current and the reference current; the output reference voltage is processed through coordinate transformation and space vector pulse width modulation algorithm in sequence to generate six-way switching signal of an inverter to control the inverter, and then the permanent magnet synchronous motor is driven to work normally through the inverter, so that the minimum loss control of the closed loop feedback of the permanent magnet synchronous motor is realized.

Disclosed in the present invention are a variable admittance-based fault current limiting system and method for a grid-forming converter. The system comprises: a power calculation module, an excitation link module, a virtual rotor module, a coordinate transformation module, a dual-loop control module, and a space vector pulse width modulation module. The power calculation module is used for calculating active power and reactive power of a current power grid; the excitation link module is used for performing steady-state stepless variable susceptance control on the basis of the calculated reactive power, so as to adjust the electromotive force of the current power grid; the virtual rotor module is used for performing transient stepped variable conductance control on the basis of the calculated active power, so as to adjust the phase angle of the current power grid; the coordinate transformation module is used for converting the adjusted electromotive force and phase angle into electromotive force components in a direct current coordinate system; the dual-loop control module is used for generating and calculating a current instruction on the basis of the converted electromotive force components; and the space vector pulse width modulation module is used for generating a modulation signal to guide operation of a switching device.

The application discloses a network-constructed converter variable inductance fault current limiting system and method, which comprises a power calculation module, an excitation link module, a virtual rotor module, a coordinate transformation module, a double-loop control module and a space vector pulse width modulation module. The power calculation module is used for calculating active power and reactive power of a current power grid; the excitation link module is used for performing steady-state reactive power inductance control according to the calculated reactive power, so as to adjust the electromotive force of the current power grid; the virtual rotor module is used for performing instantaneous active power inductance control according to the calculated active power, so as to adjust the phase angle of the current power grid; the coordinate transformation module is used for converting the adjusted electromotive force and phase angle into an electromotive force component in a direct current coordinate system; the double-loop control module is used for generating and calculating a current instruction according to the converted electromotive force component; and the space vector pulse width modulation module is used for generating a modulation signal to guide the action of a switching device.

This invention relates to the field of motor vector control technology, specifically a vector control method and system for a motor controller. The method includes: acquiring instantaneous values ​​of the three-phase stator current and transforming them to obtain feedback values ​​of direct-axis and quadrature-axis current components; generating a quadrature-axis current command value separately via a speed regulator based on the deviation between the speed command and the actual speed; setting the direct-axis current command value as a predetermined excitation reference value; comparing the quadrature and direct-axis current error signals and generating a rotating coordinate system voltage command component through proportional-integral modulation; obtaining a stationary coordinate system two-phase voltage command value through inverse coordinate transformation; and generating a drive signal to control the inverter to drive the motor via space vector pulse width modulation. This method decouples the speed loop from the direct-axis current loop, maintains a constant direct-axis excitation current, simplifies the control logic, and improves the stability of current regulation and drive signal output.

The invention provides a three-level inverter bus current estimation method and device and a vehicle, which are used for realizing the purposes of not increasing hardware, adapting to all three-level space vector states and respectively estimating the average current of positive and negative buses in real time so as to replace a sensor and meet the energy management and protection requirements of the whole vehicle. The method comprises the following steps: acquiring three-phase instantaneous current, and splitting each phase of current into a forward current component and a reverse current component; obtaining a positive duty ratio, a zero duty ratio and a negative duty ratio output by the space vector pulse width modulation in a switching period; multiplying the positive duty ratio by the positive current component of the corresponding phase and then summing to obtain a positive bus current, and multiplying the negative duty ratio by the positive current component of the corresponding phase and then summing to obtain a negative bus current; performing low-pass filtering on the positive bus current and the negative bus current respectively; and adding the filtered positive bus current and the filtered negative bus current according to the weight to form a final bus current estimation value.

The invention discloses a hybrid modulation method and device for single-resistor sampling, electronic equipment and a storage medium. The modulation method comprises the following steps: acquiring a modulation ratio, and when the modulation ratio is smaller than or equal to a first threshold value, performing modulation by adopting a space vector pulse width modulation (SVPWM) mode; when the modulation ratio is larger than the first threshold value and smaller than or equal to the second threshold value, a discontinuous pulse width modulation (DPWM) mode is adopted for modulation; when the modulation ratio is larger than a second threshold value, a DPWM mode is adopted for modulation; wherein when the modulation ratio is larger than the first threshold value and smaller than or equal to the second threshold value, the currents of the two effective space vectors are collected; when the modulation ratio is greater than a second threshold, the current of an effective space vector is collected. According to the technical scheme, the modulation mode can be dynamically adjusted according to the actual working condition, the switching loss is reduced, and the system efficiency is improved.

The invention discloses a UPQC electric energy quality multi-target governance method and system based on model prediction control, and relates to the technical field of power electronics and intelligent power grids. The method comprises the following steps: acquiring a power grid side voltage signal, a load side current signal and a direct current bus voltage signal in real time; sub-cost functions of harmonic suppression, voltage drop compensation, three-phase imbalance treatment, direct current ripple suppression and active support control are constructed; fusing into a total cost function through a weighted minimum model ideal point method, carrying out optimization by adopting a particle swarm optimization algorithm, and solving an optimal control instruction; and compensation of series and parallel converters is controlled through space vector pulse width modulation. The problems that traditional UPQC control is coupled, the precision and speed are insufficient, the ripple suppression cost is high, and multi-target ''giving consideration to one another'' are solved, and the power supply quality and reliability under complex working conditions are improved.

The invention discloses a positive and negative sequence distribution control method for realizing voltage correction under the condition of a three-phase imbalance fault, and the method comprises the steps: a positive and negative sequence decomposition module collects a grid-connected point voltage and an inductive current signal, and separates a positive sequence component and a negative sequence component; the phase control module generates a positive sequence phase and a positive sequence reference voltage amplitude, and adopts a phase-locked loop to control and generate a negative sequence phase; the voltage and current control module generates positive and negative sequence voltage instructions to obtain a total voltage instruction; the voltage support distribution control module generates an overall support coefficient and distributes the overall support coefficient into a positive sequence droop coefficient and a negative sequence proportion control parameter; and the space vector pulse width modulation module is used for converting the total voltage instruction into a PWM (Pulse Width Modulation) signal and driving an IGBT (Insulated Gate Bipolar Translator) switch of the inverter part. The control capability of the inverter is dynamically distributed to the positive sequence voltage support and the negative sequence voltage suppression, so that the grid-connected inverter is not a passive acceptor of a power grid fault any more and becomes an active voltage correction device, the electric energy quality of a PCC point during the fault period can be remarkably improved, and stable operation of a grid-connected system is ensured.

The invention provides a high-speed motor vector control method and system based on a passive control theory. The method comprises the following steps: acquiring a rotor position angle theta, a real-time angular velocity omega and a target angular velocity of a motor rotor; inputting the real-time angular velocity omega and the target angular velocity of the motor rotor into a rotating speed closed-loop controller to obtain an electromagnetic torque target value; acquiring a real-time current of a motor stator, and converting the real-time current into a real-time system current value; calculating a target system current value according to the electromagnetic torque target value and the rotor position angle theta; according to the rotor position angle theta, the real-time angular velocity omega, the real-time system current value and the target system current value, a control voltage is obtained based on a passive control law; and generating a space vector pulse width modulation signal based on the control voltage so as to drive a three-phase inverter to control the operation of the permanent magnet synchronous motor. While the decoupling control of the current loop of the high-speed motor system is realized, the control effects of reducing current ripples and improving the large-range stability of the system are achieved.

The invention relates to a permanent magnet synchronous wind turbine generator efficiency optimal control method and system based on data driving, and belongs to the technical field of wind power generation. The existing permanent magnet synchronous wind turbine generator control strategy focuses on maximum power tracking and neglects the loss change of a converter, so that the overall loss of the system is relatively high and the power generation efficiency improvement is limited. According to the method, a high-precision neural network fitting model is constructed through a data driving mode, and the relation between the converter loss and the torque current d-axis component is accurately correlated; on the basis of realizing the optimal tip speed ratio maximum power tracking, optimizing a torque current d-axis component by adopting a traversal search algorithm, and realizing the loss minimization of the converter; a driving signal is generated by combining proportional integral current control and space vector pulse width modulation, and a complete efficiency optimal control link is formed. Converter loss and calorific value are significantly reduced, the overall power generation efficiency of the system is improved, adaptability is enhanced, the service life of equipment is prolonged, and wind power economic benefits are improved.