基于三矢量模型预测控制的T型三电平整流器定频控制策略

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Abstract Aiming at the problem of neutral point potential imbalance in T-type three-level rectifier, model predictive control (MPC) has good application potential to improve the control performance of T-type three-level rectifier, but the traditional finite set model predictive control has some defects, such as large amount of algorithm calculation, difficult adjustment of weight factor, unstable switching frequency and so on, It will directly affect the application effect of model predictive control in T-type three-level rectifier. To solve the above problems, a three vector constant frequency model predictive control algorithm based on fast vector selection is proposed. Using the idea of deadbeat, the current tracking is transformed into voltage tracking, the voltage vectors far away from the reference voltage vector and unfavorable to the neutral point potential balance adjustment are eliminated, and the switching vector in the control cycle is determined according to the reference voltage vector. On this basis, the action time of the switching vector is obtained by using the voltage tracking cost function. The switching sequence is obtained according to the switching smoothness principle. Finally, the simulation is carried out. The results show that compared with the traditional finite set model predictive control, the proposed method can greatly reduce the amount of calculation and realize the fixed switching frequency, so as to reduce the voltage and power pulsation and obtain good control performance.

Key words： T-type three-level rectifier model predictive control (MPC) fixed switching frequency three vector synthesis neutral point potential balance voltage tracking

Received: 17 February 2022

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	XU Jiajie
	LI Ruihua
	HU Bo

Cite this article:

XU Jiajie,LI Ruihua,HU Bo. Fixed frequency control strategy of T-type three-level rectifier based on three vector model predictive control[J]. Electrical Engineering, 2022, 23(6): 17-23.

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http://dqjs.cesmedia.cn/EN/Y2022/V23/I6/17

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