Method and system for setting prediction step size of permanent magnet synchronous motor model
A permanent magnet synchronous motor and a technology for predicting the step size, which is applied in control systems, control generators, vector control systems, etc., can solve the problems of difficult prediction accuracy and algorithm calculation amount, and the prediction step size cannot be shortened infinitely
Active Publication Date: 2021-12-24
HEBEI UNIV OF TECH
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Problems solved by technology
However, due to the limitation of hardware computing resources, the prediction step size cannot be shortened infinitely. Therefore, how to determine the prediction step size is a problem that needs to be studied.
In the traditional predictive current control method, the predictive step size is the same as the control cycle, and it is difficult to flexibly balance the predictive accuracy and algorithm calculation amount of the MPCC method
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[0098] As an optional implementation manner, the judging module includes:
[0099] The first judging unit 3001 is used to predict that the step length adjustment coefficient is q when judging that the working condition of the motor is steady state 2 , and q 2 ≥1;
[0100] The second judging unit 3002 is used for judging that the working condition of the motor is a transient state, and when the given speed of the motor changes, the prediction step length setting coefficient is:
[0101]
[0102] Among them, q 0 Adjust the coefficient for the minimum prediction step size, q 1 is the longest prediction step adjustment coefficient in the transient process, Δω max is the maximum value of Δω;
[0103] The third judging unit 3003 is used to predict that the step size setting coefficient is:
[0104]
[0105] Among them, R ωmax It is the maximum value of the absolute value of the speed change rate after the motor load changes.
[0106] Compared with the traditional singl...
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The present invention provides a method and system for setting the prediction step size of the permanent magnet synchronous motor model, wherein the method for setting the prediction step size of the permanent magnet synchronous motor model comprises the following steps: establishing the stator current state equation of the motor under the d-q rotating coordinate system ; Discretize the stator current state equation to obtain the motor stator current prediction model; judge the working conditions of the motor, and adjust the prediction step size according to different working conditions; Axis currents are predicted to obtain prediction results; cost functions are used to evaluate the prediction results of d and q axis currents, and the voltage vector with the smallest average error is selected as the optimal voltage vector and output in the next control cycle. The step size prediction method of the invention improves the prediction accuracy of the step size in the prediction current control and reduces the calculation amount. The prediction step length setting system of the permanent magnet synchronous motor model of the present invention applies the above prediction step length method.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a method and system for setting the prediction step size of a permanent magnet synchronous motor model. Background technique [0002] Among the control methods of high-performance permanent magnet synchronous motors, model predictive current control (Model Predictive Current Control, MPCC) has attracted extensive attention due to its simple principle and easy handling of nonlinear constraints. When the total forecasting time in the predictive control method is constant, the forecasting step is the key factor affecting the forecasting error and the calculation amount of the algorithm. Both theoretical analysis and experimental tests show that the shorter the forecasting step, the smaller the forecasting error. However, due to the limitation of hardware computing resources, the prediction step size cannot be shortened infinitely. Therefore, how to determine the prediction step size ...
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IPC IPC(8): H02P21/14H02P21/22H02P25/022H02P6/34
CPCH02P21/14H02P21/22H02P25/022H02P6/34
Inventor 陈曦牛峰李奎方攸同
Owner HEBEI UNIV OF TECH