Method for compensating mismatching of model predictive control parameters for initiative front-end rectifier
A technology of model predictive control and compensation method, which is applied to the control of active front-end rectifier, and the field of active front-end rectifier model predictive control parameter mismatch compensation. , enhance the robustness and achieve the effect of stable operation
Inactive Publication Date: 2015-02-25
HENAN NORMAL UNIV
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[0003] Since the MPC control process adopts loop optimization and direct output indefinite frequency mode, its sampling frequency is high, and the operation performance is obviously affected by system delay.
Although the above algorithms can eliminate the influence of model errors on the control system, the algorithms are relatively complex, which greatly increases the calculation time of the program, thereby affecting the control effect
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[0010] The present invention will be further described below in conjunction with the accompanying drawings. The main circuit topology of the active front-end rectifier is as follows: figure 1 shown. In the figure, u ga , u gb , u gc It is a three-phase voltage source on the AC side; i ga , i gb , i gc is the three-phase AC side current; u ca , u cb , u cc is the three-phase voltage at the input side of the rectifier bridge; u dc is the DC side voltage; L g and R g Respectively, the incoming inductance and its equivalent resistance; C Is the DC filter capacitor; O is the grid midpoint; i L is the load current, the DC side load is determined by the resistor R L equivalent representation.
[0011] The mathematical model of the active front-end rectifier can be transformed into a two-phase stationary coordinate system through coordinate transformation, expressed as
[0012] (1)
[0013] In the formula: u gα , u gβ Respect...
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The invention discloses a method for compensating the mismatching of model predictive control parameters for an initiative front-end rectifier. The technical scheme provided by the invention has the following key points: according to the method for compensating the mismatching of model predictive control parameter for the initiative front-end rectifier, when control object model parameters and actual parameters are not matched, the actual model parameters are deduced reversely, and a prediction model is compensated, so that the model predictive precision is improved, and the accurate optimal voltage vector is obtained. Switching position signals corresponding to the optimal voltage vector are taken as switching signals of a control power device. According to the method for compensating the mismatching of the parameters, the actual parameters in the system operation are adopted, actual inductance parameters are obtained by reverse deducing, the influence on the system control caused by the mismatching of the model parameters is eliminated, the robustness of the model predictive control system is enhanced, and the stable operation of the initiative front-end rectifier under the condition that the predictive model has large error can be realized.
Description
technical field [0001] The invention relates to a control method for an active front-end rectifier, which belongs to the field of control of electric power electronic power conversion devices, and in particular to a model prediction control parameter mismatch compensation method for an active front-end rectifier. Background technique [0002] Model predictive control (MPC) needs to predict the operating state of the object at the next moment according to the mathematical model, which requires high accuracy of the model. The active front-end rectifier circuit contains components such as resistors and inductors. Changes in temperature, saturation of the magnetic circuit, and changes in other environmental conditions will cause changes in the parameters of resistors, inductors, and other components in the circuit. The change of circuit parameters will lead to the mismatch between the nominal value of the control system parameter and the actual parameter value of the system, wh...
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IPC IPC(8): H02M7/12
Inventor 王萌高金辉施艳艳
Owner HENAN NORMAL UNIV