15 results about "Dead-beat control" patented technology

The invention discloses a dead-beat predictive current control method for a high-speed permanent magnet synchronous motor under the low switching frequency and fundamental frequency ratio. Firstly, a reference stator flux linkage vector at the k + 1 moment is predicted according to reference d-q axis current and a current-flux linkage discretization model, and then the stator current at the k + 1 moment under a synchronous rotating coordinate system is predicted based on the current-flux linkage model and the predicted stator flux linkage at the k + 1 moment. And on the basis of the assumption that the current remains unchanged in a short time step length, predicting a reference stator flux linkage vector at the moment k + 2 under the alpha-beta axis, and calculating a reference voltage at the moment k + 1 according to a current-flux linkage discretization model in combination with the stator flux linkage and the stator current at the moment k + 1. Influences of sampling delay and rotor motion are considered, excellent dead-beat control of high-speed d-q axis current can be achieved even under the condition of very low SFR, d-q axis cross coupling can be almost eliminated in the high-speed transient process, and stable operation under the high rotating speed of the motor can be achieved.

The invention discloses a model-free predictive control harmonic and torque ripple suppression method for a permanent magnet synchronous motor. The method comprises the following steps: sampling physical information of the permanent magnet synchronous motor; performing Clarke transformation on the obtained three-phase current, and performing Park transformation by applying the sampled rotor position to obtain actual current under the dq axis; according to the obtained dq-axis actual current and the motor winding voltage, updating an ESO-based hyper-local model after forward Euler method discrete transformation; calculating a control voltage by applying a traditional dead-beat current control method through a disturbance update value obtained through calculation; and carrying out inverse Park conversion on the deadbeat control voltage obtained after calculation, then carrying out traditional SVPWM modulation to obtain a three-phase PWM waveform, and inputting the three-phase PWM waveform into a driver to control the permanent magnet synchronous motor. According to the method, current ripples and torque ripples of model-free predictive control of the permanent magnet synchronous motor can be remarkably reduced, high-frequency harmonics in the operation process of the motor can be remarkably reduced, and the calculation burden is reduced.

The invention provides a design and application method of a sliding-mode deadbeat reaching law, and relates to the technical field of electrical engineering, and the method comprises the steps: designing a sliding-mode deadbeat reaching law SMDRL, designing a control strategy through a deadbeat control principle, defining a state change law on a sliding-mode surface through a sign function, and achieving the design of the sliding-mode deadbeat reaching law SMDRL. It is ensured that the system state converges to the sliding mode surface at the fastest speed in a control period; an improved sliding mode deadbeat reaching law ISMDRL is designed, a traditional sign function is replaced with a hyperbolic tangent function, and parameters of the hyperbolic tangent function are adjusted according to the system state; the SMDRL and the ISMDRL are applied to a speed driving system of a permanent magnet synchronous motor (PMSM), and the speed driving system comprises a PMSM mathematical model, a sliding mode speed controller with a speed disturbance observer and model prediction current control. The SMDRL is introduced from the traditional sliding mode reaching law for the first time through theoretical derivation, the convergence time of the SMDRL is the shortest, and the SMDRL is applied to a permanent magnet synchronous motor speed driving system.

The present invention discloses a method for suppressing harmonics and torque ripple in model-free predictive control of a permanent magnet synchronous motor. The method comprises the following steps: sampling physical information of the permanent magnet synchronous motor; performing a Clarke transform on the obtained three-phase current, and then performing a Park transform on the sampled rotor position to obtain the actual current along the dq axes; updating an ESO-based hyperlocal model after forward Euler method discrete transformation based on the obtained actual current along the dq axes and the motor winding voltage; calculating a control voltage using a traditional deadbeat current control method based on the calculated disturbance update value; and performing an inverse Park transform on the calculated deadbeat control voltage, followed by traditional SVPWM modulation, to obtain a three-phase PWM waveform, which is input into a driver to control the permanent magnet synchronous motor. The method can significantly reduce current ripple and torque ripple in the model-free predictive control of the permanent magnet synchronous motor, significantly reduce high-frequency harmonics during motor operation, and reduce the computational burden.

The application relates to a kind of linear vernier permanent magnet motor deadbeat control methods, on the basis of traditional DTC control, by introducing speed backstepping controller to replace traditional speed loop PI regulator, using deadbeat controller to replace current loop PI regulator, using improved double-sampling double-update SVPWM to replace traditional SVPWM modulation module.According to multiple simulation, the application can effectively reduce the overshoot of the system and effectively reduce the thrust ripple of the system on the basis of maintaining traditional DTC control, and improve the dynamic performance of the system.

The present invention discloses an optimization method, device, storage medium and product for a energy storage converter controller. The method includes designing an energy storage converter controller, which includes an outer loop and an inner loop, and the inner loop is a deadbeat controller; establishing a mathematical model of the deadbeat controller; determining a recurrence expression of the identification parameters according to the constructed optimization objective function; when it is judged to start parameter identification calculation according to the command current and the actual output current at the current moment, calculating the identification parameters at the current moment according to the current moment current data and voltage data of the main circuit of the energy storage converter and the recurrence expression of the identification parameters; when it is judged to converge according to the identification parameters at the current moment and the previous moment, substituting the identification parameters at the current moment into the mathematical model of the deadbeat controller to realize the online optimization process of the deadbeat controller. The present invention performs online optimization on the mathematical model of the deadbeat controller, improving the system control accuracy.

The present invention relates to a deadbeat control method with delay compensation for a three-phase rectifier, comprising the following steps: (1) performing closed-loop control on the three-phase rectifier using deadbeat control to achieve closed-loop control of DC voltage and AC current; (2) sampling k The three-phase grid voltage, three-phase current and DC side voltage at the moment; (3) The vector angle extrapolation method and current prediction calculation formula are used to obtain k +1 time three-phase grid voltage and three-phase current; (4) k Substitute the state variables at time +1 into the current prediction calculation formula and solve k +1 time, and convert it into a drive signal, that is, k Time output k The voltage value at the +1 moment is k +1 time converter to obtain k The method is beneficial to reduce the delay on the deadbeat control of the rectifier and improve the comprehensive performance of the rectifier.

The application discloses an improved deadbeat control method for reducing switching loss, and is implemented according to the following steps: step 1, modeling a single-phase circuit of an MMC, and meanwhile, establishing a single-phase upper and lower bridge arm node current equation; step 2, discretizing the established equation, and taking a ring current as a reference quantity to establish a deadbeat control system; step 3, collecting voltages of upper and lower bridge arms of each phase of the MMC and discriminating voltage discretization; step 4, operating the upper and lower bridge arm voltages output by step 2 to obtain the number of sub-modules that should be turned on for each phase of the upper and lower bridge arms of the MMC in the next control period; and step 5, sorting each sub-module voltage of each phase after being processed in step 3, and meanwhile, turning on or turning off specific sub-modules according to the number of sub-modules that should be turned on for each phase of the upper and lower bridge arms in the next control period obtained in step 4. The application can improve system dynamic performance, improve output voltage quality and reduce the number of times of turning on sub-modules of the system.

The invention provides a dead-beat speed and current fusion control system and method for a non-cascade permanent magnet synchronous motor, relates to the technical field of motor control, adopts a dead-beat model prediction control technology, integrates speed and current control in the same loop, and effectively improves the dynamic response speed and control precision of the system. By introducing the saturation function type improved sliding mode load observer, the system can accurately estimate the load torque in real time, and meanwhile, the high-frequency buffeting phenomenon is effectively inhibited. In addition, the system is also integrated with an extended state observer to compensate motor parameter changes and unmodeled errors, and the robustness of the control algorithm is further enhanced. Based on the deadbeat control strategy of the discretization model, the optimal control voltage can be quickly predicted and output, and it is ensured that the motor can operate efficiently and stably in different operation stages.

The present invention provides a current control strategy for a permanent magnet synchronous motor simulator based on pole reconstruction. It uses complex vectors for modeling and analysis, simplifies the d-axis and q-axis voltage equations of a conventional interface circuit into a complex vector voltage equation model; the delay link of the system is considered in the modeling, making the obtained discrete complex vector model more in line with the actual digital control requirements; the control strategy obtained after pole reconstruction has the advantages of flexible parameter selection, good robustness, no steady-state error, etc., and can achieve the required control effect through parameter configuration. In particular, it can achieve deadbeat control without static error, overcomes the problem of steady-state error existing in traditional deadbeat current predictive control under parameter perturbation, and at the same time expands the parameter mismatch stability range of traditional deadbeat current predictive control.

This invention discloses a simulation interface control method and system. The method includes: constructing a digital subsystem and a physical subsystem for a novel power distribution system; then: introducing a controlled current source into the digital subsystem circuit and a controlled voltage source into the physical subsystem circuit; real-time acquisition of the output voltage signal of the digital subsystem and the input voltage signal of the controlled voltage source in the physical subsystem within the same cycle; extracting the fundamental phase of the output and input voltage signals and calculating the difference to obtain the voltage phase difference; based on the voltage phase difference, using a deadbeat controller to perform delay compensation for the errors in the output and input voltage signals to eliminate signal tracking errors. The deadbeat controller includes a state observer and a repetitive predictive observer. By using this invention, interface delay compensation can be achieved while satisfying the real-time performance and stability of the simulation. This invention can be widely applied in the field of digital-physical hybrid simulation.

The present invention discloses a deadbeat control method for an LCL-type photovoltaic inverter based on composite prediction, including: analyzing the voltage loop equation of the photovoltaic grid-connected system, discretizing it, and conducting a preliminary theoretical analysis of deadbeat control; using the repetitive control method to calculate the output current at the k+1 moment, and on this basis, using the Lagrange interpolation method to calculate the current at the k+2 moment and perform repetitive compensation on it; adopting adaptive forward linear current prediction, sampling and predicting the forward current at intervals of two cycles, and using the Levinson-Durbin algorithm for the prediction error to obtain the update equation and the minimum error; performing composite control on the repetitive prediction and the adaptive forward current prediction, and deriving its discriminant. This method shortens the system oscillation time, enhances the dynamic response ability, and finally performs composite control on the two methods, predicting the inverter output current one beat in advance and predicting the sampling reference current two beats in advance, solving the problem of time delay.

The application discloses a kind of high-reliability motor improved deadbeat torque control digital implementation methods, belong to motor drive control technical field.It includes the following steps: construct stator flux oriented coordinate system, acquisition motor signal and establish five-phase fault-tolerant motor model;Full-order Luenberger current observer is constructed to carry out delay compensation and state prediction to five-phase current;Hybrid flux observer is constructed, and integral drift of voltage model is corrected by closed-loop compensation, and the amplitude and phase angle of stator flux are obtained;Deadbeat control is carried out in MT coordinate system, and the simplified linear relationship between electromagnetic torque and load angle is established, and the reference voltage vector is linearly solved;The reference voltage is transformed back to the stationary coordinate system, and the switching signal is generated by using adjacent four-vector space vector pulse width modulation to drive the motor.The application can significantly improve the control performance of five-phase motor under normal operation of control system and the system stability under parameter mismatch, and has important significance for strengthening the reliability and stability of multiphase electric drive system.

The invention belongs to the technical field of motor control, and particularly relates to a permanent magnet synchronous motor dead-beat predictive current control method based on CQRESO. The method comprises the following steps: constructing an expansion state equation of a d-axis subsystem and a q-axis subsystem; then, cascade quasi-resonance extended state observers of the d axis and the q axis are constructed; d-axis current, q-axis current, total disturbance of a d-axis subsystem and total disturbance of a q-axis subsystem are observed; a forward Euler method and a backward Euler method are used for further processing cascade quasi-resonance extended state observers of a d axis and a q axis to obtain d-axis current, q-axis current, total disturbance of a d-axis subsystem and a predicted value of a q-axis subsystem, and finally needed d-axis deadbeat instruction voltage and q-axis deadbeat instruction voltage are calculated according to the deadbeat control principle. Space vector pulse width modulation is carried out to convert into a driving signal, and the driving signal is transmitted to a three-phase inverter to complete adjustment of d-axis current and q-axis current; according to the invention, the sensitivity of the control system to noise and the robustness of coping with motor parameter perturbation are reduced.

The present disclosure provides a dual-vector model predictive current control method for an induction motor, including: obtaining a stator current reference vector in a two-phase stationary coordinate system; deriving a predicted value of the stator current at time k + 2 considering one-beat delay compensation; calculating a stator voltage reference vector based on the principle of stator current deadbeat control; using a space vector pulse width modulation method to calculate the initial action times of two effective vectors and a zero vector; comparing the magnitude relationship of the vector initial action times to select two basic voltage vectors and their action times acting within a control period; determining symmetrically placed basic voltage vectors based on the principle of minimizing the number of switch state transitions and optimizing the vector action sequence; optimizing the vector action time with the goal of minimizing the effective value of the current error within a control period. The dual-vector model predictive current control method for an induction motor provided by the present disclosure effectively reduces current harmonics, has low computational complexity, is simple to implement, and has strong practicability.