期刊论文

Optimized model predictive control strategy of modular multilevel converter

中文

中南大学学报(自然科学版)

1672-7207

2020

51

1

86-93

10.11817/j.issn.1672-7207.2020.01.011

国家自然科学基金资助项目（51977014）~~；

本校为第一机构

为了保证MMC-HVDC系统的安全稳定运行,针对网压不对称工况下模块化多电平换流器出现的内部能量分布不均以及波动增加等问题,提出基于能量分析的模块化多电平换流器优化模型预测控制策略。通过对网压不对称工况下换流器内部能量进行分析,采用一种优化的模型预测控制,针对交流侧相电流、MMC内部环流、子模块电容电压设计3个独立的控制阶段,避免权重选取。最后,通过MATLAB/SIMULINK软件进行仿真验证。研究结果表明:所提出的控制策略在有效控制MMC外部特性的同时,能实现MMC内部能量控制。

In order to ensure the safe and stable operation of MMC-HVDC system, the unbalanced energy distribution between arms and the increase of capacitance energy fluctuation of sub-module appear in MMC under unbalanced grid condition were analyzed, and an optimized model predictive control(OMPC) of MMC based on energy analysis was proposed. The OMPC was adopted based on the internal energy analysis of MMC under unbalanced grid condition. For AC side phase current, MMC internal circulation and sub-module capacitance voltage, three independent control stages were designed to avoid weight selection. Fi...