Title of Paper:Unbalance Control Strategy of Boost Type Three-Phase to Single-Phase Matrix Converters Based on Lyapunov Function

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Affiliation of Author(s):民航学院

Journal:JOURNAL OF POWER ELECTRONICS

Key Words:Lyapunov function Matrix converter Positive and negative sequence Unbalance Weighted synthesis

Abstract:This paper analyzes the input side performance of a conventional three-phase to single-phase matrix converter (3-1MC). It also presents the input-side waveform quality under this topology. The suppression of low-frequency input current harmonics is studied using the 3-1MC plus capacitance compensation unit. The constraint between the modulation function of the output and compensation sides is analyzed, and the relations among the voltage utilization ratio and the output compensation capacitance, filter capacitors and other system parameters are deduced. For a 3-1MC without large-capacity energy storage, the system performance is susceptible to input voltage imbalance. This paper decouples the inner current of the 3-1MC using a Lyapunov function in the input positive and negative sequence bi-coordinate axes. Meanwhile, the outer loop adopts a voltage-weighted synthesis of the output and compensation sides as a cascade of control objects. Experiments show that this strategy suppresses the low-frequency input current harmonics caused by input voltage imbalance, and ensures that the system maintains good static and dynamic performances under input-unbalanced conditions. At the same time, the parameter selection and debugging methods are simple.

ISSN No.:1598-2092

Translation or Not:no

Date of Publication:2019-01-01

Co-author:Xu, Yu-xiang,Guo, Hai,ghd

Correspondence Author:Xu, Yu-xiang,Ge Hongjuan