Optimal Modulation Ratio Model Predictive Control Strategy for Three-phase Matrix Isolation Rectifier

doi:10.11985/2023.04.018

Abstract

Abstract:

Taking the three-phase matrix isolation rectifier(3MIR) as the research object, in order to reduce the current distortion rate at the grid side, maintain the constant output voltage and speed up the dynamic response speed of the system, the traditional model predictive control strategy is improved, and a model predictive current control strategy based on the optimal modulation ratio is proposed. Firstly, the network side current is predicted by 3MIR discrete mathematical model, and the evaluation function is constructed with the minimum network side current error as the control objective. Secondly, in order to fix the switching frequency and reduce the amount of calculation, the optimal modulation ratio corresponding to the minimum current error is derived by the evaluation function, and the pulse signal is generated combined with the bipolar current space vector modulation strategy to drive the power switch. Finally, the proposed model predictive control is compared with the traditional double closed-loop PI control and the traditional model predictive control. The simulation results verify the feasibility and effectiveness of the proposed control strategy.

Key words: Matrix converter, isolation rectifier, model predictive control, bipolar current space vector modulation

CLC Number:

TM461

YANG Yi, BAI Liu, GUO Qiang. Optimal Modulation Ratio Model Predictive Control Strategy for Three-phase Matrix Isolation Rectifier[J]. Journal of Electrical Engineering, 2023, 18(4): 161-170.

Figures/Tables 11

References 22

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参数	数值
输入相电压幅值U_m/V	311
电网频率f_m/Hz	50
开关频率f_s/kHz	100
网侧滤波电感L_s/μH	30
网侧滤波电容C_s/μF	5
高频变压器变比	1∶1
直流侧电感L_o/μH	450
直流侧电容C_o/μF	150
直流侧电压给定值U^*_o/V	400
负载电阻R/Ω	20

评价指标	双闭环PI控制策略	传统模型预测策略	本文所提控制策略
开关频率	固定	不固定	固定
系统运算量	小	大	小
PI控制器数量	2	0	1
谐波含量	高	较低	低
有功、无功波动范围	宽	较窄	窄
输出纹波	小	小	非常小
动态响应速度	较慢	迅速	迅速