Research on Parallel Three Phase PWM Converters base on RTDS

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Xia, Yan^1 ; Zou, Jianxiao^1 ; Li, Kai^1 ; Liu, Jingbo^2 ; Tian, Jun^2

School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu

611731, China^1

Central Research Institute of Dongfang Electric Corporation, Chengdu

611731, China^2

关键词: Circulating current;    Control strategies;    Hardware in the loops;    Modular converters;    Parallel converter;    Parallel operations;    Real time digital simulator;    Zero sequence circulating currents;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/5/052038/pdf
DOI  :  10.1088/1755-1315/108/5/052038

来源: IOP

【 摘 要 】

Converters parallel operation can increase capacity of the system, but it may lead to potential zero-sequence circulating current, so the control of circulating current was an important goal in the design of parallel inverters. In this paper, the Real Time Digital Simulator (RTDS) is used to model the converters parallel system in real time and study the circulating current restraining. The equivalent model of two parallel converters and zero-sequence circulating current(ZSCC) were established and analyzed, then a strategy using variable zero vector control was proposed to suppress the circulating current. For two parallel modular converters, hardware-in-the-loop(HIL) study based on RTDS and practical experiment were implemented, results prove that the proposed control strategy is feasible and effective.