104 results about "Space vector pwm" patented technology

The invention relates to the technical field of motor control, and discloses a hybrid excitation synchronous motor control strategy optimization method and device. The method comprises the following steps: performing mathematical modeling on permanent magnet flux linkage, exciting current and rotor parameters of the hybrid excitation synchronous motor to obtain a state observer equation; collecting current parameters and position parameters, and performing filtering processing to obtain motor operation state parameters; inputting a five-layer deep neural network for current and rotating speed parameter prediction to obtain an optimal current parameter and an optimal rotating speed prediction parameter; constructing a multi-objective function, and solving to obtain a current reference value; inputting the current reference value into a cascade PI controller, and performing voltage regulation through feedforward decoupling control and a space vector pulse width modulation technology to obtain a control voltage signal; and performing performance calculation control parameter optimization on the control voltage signal to obtain a target control parameter, thereby improving the control precision of the hybrid excitation synchronous motor.

The invention relates to the technical field of permanent magnet synchronous motor control. The invention provides a permanent magnet synchronous motor adaptive high-order terminal sliding mode observer control method. The method comprises the following steps: establishing an expansion equation of a motor under an alpha-beta two-phase static coordinate system; designing a high-order terminal sliding mode surface based on the extension equation; designing a self-adaptive gain; designing a current signal control law and a back electromotive force signal control rate of the high-order terminal sliding mode surface based on the adaptive gain, the expansion equation and the high-order terminal sliding mode surface; obtaining constraint conditions of the adaptive gain and the control gain k; defining an expression of the adaptive gain; designing an adaptive high-order terminal sliding mode observer based on a current signal control law and a back electromotive force signal control rate; acquiring an electrical angular speed and a rotor electrical angle based on an orthogonal component phase-locked loop method; and controlling the operation of the motor based on field-oriented control and space vector pulse width modulation. According to the invention, the control system can maintain robustness and high-precision output at the same time under the high dynamic response requirement.

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 an adaptive current decoupling control method for a sliding mode of a permanent magnet synchronous motor, and the method comprises the steps: designing an extended state observer to observe a d-q axis current and a voltage disturbance term, carrying out the difference between a current observation value and a reference current, and inputting the difference into a non-singular integral terminal sliding mode controller, thereby obtaining a d-q axis voltage; and then the observed d-q axis voltage disturbance term is superposed to form a total d-q axis voltage. And then identifying the d-q axis inductance and permanent magnet flux linkage of the permanent magnet synchronous motor by using a recursive least square method with dynamic forgetting and adaptive regularization factors, and sending the d-q axis inductance into the extended state observer to realize a closed-loop adaptive extended state observer. And after coordinate transformation and space vector pulse width modulation are carried out on the d-q axis total voltage, the d-q axis total voltage is used for driving an inverter to control the permanent magnet synchronous motor. The method improves the current decoupling effect and anti-disturbance capability of the permanent magnet synchronous motor, adaptively adjusts the parameters of the controller according to the change of working conditions, and improves the robustness of the system.

The invention relates to a capacitor type selection method and device of a unified power quality conditioner and computer equipment, and relates to the technical field of power electronics, and the method comprises the steps: obtaining modulation wave functions of space vector pulse width modulation of input and output AC ports when the unified power quality conditioner is in a preset operation condition; the operation conditions comprise rated and limit conditions; obtaining first current values of the input and output AC ports; obtaining a modulation wave value corresponding to each modulation wave function, and obtaining a first capacitance current average value of each capacitor in each switching period based on the modulation wave value and each first current value; based on the first capacitance current average value of each capacitor, determining a second capacitance current average value flowing through each capacitor in a fundamental wave period; based on the first capacitance current average value and the second capacitance current average value, obtaining a capacitance current instantaneous value of each capacitor in a fundamental wave period; and processing the current instantaneous value of each capacitor based on a preset mode to determine the minimum capacitance value of each capacitor so as to realize the type selection of each capacitor.

The invention discloses a dead zone compensation control method, electronic equipment, a storage medium and a product, relates to the technical field of motor control, is applied to a motor control system, and comprises the following steps: obtaining an original duty ratio of the motor control system through space vector pulse width modulation, and calculating a compensation duty ratio for dead zone compensation in the motor control system; determining a first partition threshold value according to the minimum pulse width duty ratio of the motor control system, and determining a second partition threshold value according to the minimum pulse width duty ratio and the dead zone duty ratio of the motor control system; according to the first partition threshold value and the second partition threshold value, the duty ratio value interval is divided, and compensation subintervals are obtained; and determining a target compensation subinterval of the original duty ratio in each compensation subinterval, and executing a duty ratio compensation strategy of the target compensation subinterval to obtain a target duty ratio. The technical problem of unstable compensation control is solved.

The invention discloses a high-frequency motor-driven self-adaptive multi-rate control system. A q-axis reference current is calculated through a rotating speed PI ring; a disturbance estimation parameter is obtained based on an adaptive law of a recursive least square method algorithm, the disturbance estimation parameter is combined with an absolute current error to obtain a predicted current error compensation value, and an adaptive extended state observer is designed; dividing each sampling interval Ts into N control intervals of which the time scale is Tc based on an observer to establish a self-adaptive multi-rate boosting model; solving an optimal reference control voltage based on a multi-rate control law; and finally, generating a switching signal of a high-frequency motor driver through space vector pulse width modulation, and controlling a switching tube to realize a final control effect.

The invention discloses a control method based on a vehicle-mounted equipment rotation system, and belongs to the technical field of PID control optimization, and the method specifically comprises the steps: 1, constructing a PID control model based on the vehicle-mounted equipment rotation system, which comprises 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, improving a dung beetle optimization algorithm, wherein the specific implementation is as follows: D1, processing a dung beetle individual position cross-border problem by using a boundary reflex method; d2, introducing successful experience of learning other dung beetles in the dung beetle stealing process, and guiding the stealing behavior through the historical optimal position; step 3, optimizing a current inner loop PID controller of the permanent magnet synchronous motor control system by using an improved dung beetle optimization algorithm to obtain optimal Kp, Ki and Kd control parameters of the current inner loop PID controller; and step 4, modeling simulation is carried out on the control of the vehicle-mounted equipment rotation system by adopting MATLAB (Matrix Laboratory).

The invention belongs to the technical field of power electronics, and particularly relates to a model prediction control method and a T-type three-level three-phase inverter device thereof. The invention provides a model prediction current amplitude limiting control method for a T-type three-level three-phase inverter under an unbalanced power grid based on four-vector synthesis space vector pulse width modulation. A reference voltage is obtained through model prediction, after the reference voltage is obtained, based on a space vector pulse width modulation strategy, a vector synthesis mode is adopted, a voltage vector is divided into 36 sectors according to different switching states, a switching state corresponding to the generated reference voltage is obtained through a four-vector synthesis mode, and a fixed switching frequency is obtained; and a multi-target cost function is established according to a reference voltage and a direct-current side capacitor voltage difference, a resultant vector is symmetrically distributed through a time inverse proportion function, finally, the output current of the inverter is controlled to be kept at a low harmonic distortion rate under balanced and unbalanced working conditions and is effectively limited within a specified range, and meanwhile, the direct-current side neutral-point potential is kept balanced.

The invention relates to an anti-interference control method for a permanent magnet synchronous motor, in particular to an anti-interference control method for a permanent magnet synchronous motor based on a self-adaptive super-spiral permanent magnet synchronous motor, which comprises the following steps of: estimating the total disturbance Z (t) of the motor through a self-adaptive super-spiral sliding mode observer according to the difference # imgabs1 # between a motor rotating speed set value # imgabs0 # and the actual rotating speed omega m of the motor; and substituting # imgabs2 # and Z (t) into a non-singular fast terminal sliding mode controller at the same time to obtain a stator current q-axis component expected value # imgabs3 # current loop control part adopts a control mode that a quasi-proportional resonance controller is connected with a PI controller in parallel. According to the difference of the current components of the alpha axis and the beta axis under the static coordinate, the components of the reference voltage of space vector pulse width modulation on the alpha axis and the beta axis are obtained, and then motor driving is achieved. According to the invention, the problems of large current harmonic wave, poor rotating speed dynamic and static response, large overshoot and poor anti-interference performance under the control mode of the traditional PI controller can be solved.

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 provides a space vector pulse width modulation method of a two-phase four-leg inverter and a related device, and belongs to the technical field of power electronics. According to a sector where a reference output voltage vector is located, whether the action time of an adjacent voltage vector and the action time of a zero voltage vector in the sector where the reference voltage vector is located after equal-proportion shortening is conducted or not is judged, and the state of a selected switching tube, the switching sequence of the switching tube and the state duration of the switching tube are determined. And according to the selected switching tube state, the switching tube switching sequence and the switching tube state duration, generating a driving signal for controlling the switching tube state switching so as to control the on-off of each switching tube of the two-phase four-leg inverter. The method solves the problems that in the prior art, the calculation process is complex, the state switching of a switching tube is frequent, and the utilization rate of direct-current voltage is too small.

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.

A control method for suppressing high-frequency howling of a permanent magnet synchronous motor relates to the field of motor control and noise suppression, and includes the following steps: Step 1: Considering the influence of rotor position on pulse width modulation, design a segmented hybrid switching frequency modulation strategy: Step 2: Simulate and determine the frequency, spread spectrum width and proportional coefficient of the triangular wave periodic function in the segmented hybrid switching frequency modulation strategy, Step 3: According to Step 1 and Step 2, obtain the change value of the switching frequency with the rotor position, and output six-way drive signals after space vector pulse width modulation, which are used to control the on and off of the switch tube of the permanent magnet synchronous motor driver inverter, so as to achieve the purpose of suppressing the high-frequency howling of the permanent magnet synchronous motor. The present invention suppresses high-frequency sideband harmonics, thereby suppressing the high-frequency howling of the permanent magnet synchronous motor. The method is low-cost, easy to implement, and does not need to add additional hardware equipment; a segmented hybrid switching frequency spread spectrum modulation strategy is set to better disperse and suppress high-frequency current harmonics and high-frequency howling noise.

The invention discloses a full-link energy management method and system of a wave energy independent power supply system. The method comprises the steps that when the built-in vibration body type wave energy power generation device captures wave energy, a reference signal of generator acting force generated in real time in the running state of the built-in vibration body type wave energy power generation device is obtained; converting the reference signal of the acting force of the generator into a reference signal of the dq-axis voltage of the generator, and outputting the reference signal of the dq-axis voltage of the generator into an SVPWM signal corresponding to the reference signal of the dq-axis voltage of the generator through space vector pulse width modulation; controlling an AC / DC converter to convert alternating current into direct current through an SVPWM signal; and when the direct current output by the AC / DC converter is transmitted to the direct current bus, performing voltage stabilization control on the voltage of the direct current bus by adopting a controller based on the Lyapunov theorem. The technical problems that in the prior art, a wave energy power supply device is low in power generation efficiency, unstable in output power and uncertain in energy flow are solved.

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 provides a fault-tolerant control signal generation method, a control method, a generation device and equipment, and solves the technical problem that an existing rectifier fault-tolerant control method is not stable enough. By arranging the protective tubes at the P position, the O position and the N position of the rectifier and cutting off the faulty switch tube by fusing the protective tubes after the switch tube breaks down, the embodiment of the invention can isolate the faulty position in time and avoid further expansion of the fault. When the fuse is detected to be fused, the implementation mode can automatically select different fault-tolerant control strategies according to the position of the fault switch tube, so that other normally working switch tubes can still run continuously. According to the mode, plate explosion or system shutdown caused by faults of individual switch tubes is effectively avoided, and stable operation of the rectifier system is ensured. Meanwhile, a control signal is generated based on a space vector pulse width modulation algorithm, the system after the fault can be accurately controlled, and the stability of the output voltage is maintained.

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 present invention relates to the technical field of motor control, and particularly to a control method and system for a motor. The method includes the following steps: The motor main control unit MCU obtains and receives the corresponding target motor speed set by the user and performs inverse angle parameter calculation and assignment to obtain the motor angle parameter; obtains the direct-axis current and the cross-axis current and performs motor load control calculation to obtain the direct-axis voltage control amount and the cross-axis voltage control amount; transmits the motor angle parameter, the direct-axis voltage control amount, and the cross-axis voltage control amount to the space vector pulse width modulation SVPWM module and performs SVPWM modulation processing to generate the motor rotor control SVPWM waveform; determines the phase voltage control values applied to each motor winding and performs control duty cycle adjustment analysis, and at the same time controls the speed and direction of each corresponding motor. The present invention can improve the operating efficiency and response speed of the motor.

The present invention relates to the field of motor control technology, and discloses a hybrid excitation synchronous motor control strategy optimization method and device. The method includes: mathematically modeling the permanent magnet flux, excitation current and rotor parameters of the hybrid excitation synchronous motor to obtain a state observer equation; collecting current parameters and position parameters, and filtering them to obtain motor operation state parameters; inputting a five-layer deep neural network to predict current and speed parameters to obtain optimal current parameters and speed prediction parameters; constructing a multi-objective function to solve and obtain a current reference value; inputting the current reference value into a cascade PI controller, and adjusting the voltage through feedforward decoupling control and space vector pulse width modulation technology to obtain a control voltage signal; optimizing the control parameters of the control voltage signal by performance calculation to obtain target control parameters. The present invention improves the control accuracy of the hybrid excitation synchronous motor.

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 present application provides a motor simulator control method for suppressing low-frequency circulating current of a common DC bus, which is used to control the motor simulator in a motor-to-motor test platform with a common DC bus structure, and suppress the low-frequency circulating current between the motor controller and the motor simulator, including the following steps: establishing a control model of the motor-to-motor test platform with a common DC bus structure; establishing a unified model of a sinusoidal pulse width modulation algorithm based on zero-sequence component injection and a space vector pulse width modulation algorithm; using a common-mode voltage modulation factor to adjust the sinusoidal pulse width modulation algorithm based on zero-sequence component injection; and using the adjusted sinusoidal pulse width modulation algorithm based on zero-sequence component injection to control the motor simulator. The method provided in the present application controls the power inverter unit on the motor simulator side to actively generate a common-mode voltage at the zero-vector action time level to achieve effective suppression of low-frequency circulating current.

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 invention discloses a droop control method for an isolated microgrid based on a Logistic exponential function, comprising the following steps: Step 1, establishing an isolated microgrid three-phase inverter system, including a main circuit, a measurement system, a power calculation module, a droop control module, and a voltage and current double closed-loop module; Step 2, measuring the output voltage and output current of the isolated microgrid three-phase inverter by the measurement system; Step 3, inputting the power calculation module to calculate the real-time active power and reactive power output by the inverter; Step 4, inputting the droop control module to obtain the frequency value and reference voltage value of the isolated microgrid three-phase inverter system. Step 5, subtracting the reference voltage value from the output voltage value to obtain a voltage offset, inputting the voltage and current double closed-loop module, and obtaining a space vector pulse width modulation modulation wave SVPWM after processing; Step 6, the SVPWM controls the switch of the system power tube, thereby controlling the output voltage of the system and realizing overall precise control.

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.