Model Predictive Control Based on Quasi-Z Source Modular Multilevel Converter

doi:10.3969/j.issn.1008-0198.2023.01.002

Abstract

Abstract: In order to solve the problems of complex control structure, large fluctuation of DC-link voltage, poor AC output power quality and slow dynamic response when traditional carrier stack phase-disposition pulse width modulation (PD-PWM) is used in quasi-Z source modular multilevel converter (qZ-MMC), a model predictive control (MPC) for qZ-MMC is proposed in this paper. The control set of output voltage level is constructed according to the DC-link voltage, so as to predict the output current, without setting a PWM generator for each sub-module. At the same time, the mathematical model of inductor current and capacitor voltage of quasi-Z source network is analyzed, and the cost function of inductor current, capacitor voltage and AC output current is designed, so as to suppress the fluctuation of DC-link voltage and improve the power quality of output voltage. The effectiveness and feasibility of the proposed control method are verified on MATLAB/SIMULINK simulation platform.

Key words: quasi-Z source inverter, modular multilevel converter, model predictive control

CLC Number:

TM464

ZHANG Yang, LUO Chaokui, YI Wenjing, CHENG Zhun. Model Predictive Control Based on Quasi-Z Source Modular Multilevel Converter[J]. Hunan Electric Power, 2023, 43(1): 8-16.

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