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Robust fixed-frequency type model prediction control method for active front-end rectifier

A model predictive control and rectifier technology, which is applied in the direction of converting irreversible AC power input to DC power output, etc., and can solve problems such as small amount of calculation.

Inactive Publication Date: 2013-02-13
HENAN NORMAL UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the existing model predictive control method, and provides a fixed-frequency model predictive control method for active front-end rectifiers. Match the impact on the system to improve the robustness of the model predictive control system

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  • Robust fixed-frequency type model prediction control method for active front-end rectifier

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[0013] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 middle, u ga , u gb , u gc 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 power bridge, u dc is the DC side voltage, L g and R g are the incoming inductance and its equivalent resistance, respectively, C is the DC filter capacitor, O is the midpoint of the grid, i L is the load current, the DC side load is determined by the resistor R L equivalent representation. Define a unipolar binary logic switch function S k ， when S k =1( k = a, b, c) for the converter k The upper bridge arm of the phase is opened, and the lower bridge arm is closed; S k =0 means the upper bridge arm is closed and the lower bridge arm is open.

[0014] Under stable conditions, the mathematical model of the active front-end re...

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Abstract

The invention discloses a robust fixed-frequency type model prediction control method for an active front-end rectifier. The technical scheme adopted by the invention comprises the key points that according to the robust fixed-frequency type model prediction control method for the active front-end rectifier, when a model parameter of a controlled object is not matched with an actual parameter, the difference between an actual current and a predicted current is calculated and a prediction model is subjected to compensation in real time so as to improve the model prediction accuracy and obtain accurate action time of each vector; and the action time of each vector is processed by a modulator to obtain a switching signal for controlling a power device. The robust fixed-frequency type model prediction control method for the active front-end rectifier, which is disclosed by the invention, can eliminate the influence of the mismatching of the model parameter on a control system, strengthens the robustness of the model prediction control system and implements the stabile operation of the active front-end rectifier under the condition that the prediction model has a large error.

Description

[0001] technical field [0002] The invention relates to a control method for an active front-end rectifier, which belongs to the field of control of power electronic power conversion devices, and in particular to a robust fixed-frequency model predictive control method for an active front-end rectifier. Background technique [0003] Model predictive control is a control algorithm that predicts its future response based on the model of the controlled object. The algorithm includes a value function defined in terms of control objectives. By minimizing this cost function, the algorithm predicts the most effective voltage vector in each sampling period and uses it as the action vector in the next sampling period. Model predictive control 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 change of circuit parameters will lead to the mismatch between the nominal value of ...

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Application Information

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IPC IPC(8): H02M7/12
Inventor 王萌高金辉施艳艳
Owner HENAN NORMAL UNIV
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