期刊论文

Xia, Xiangyang(xia_xy@126.com)

中文

中南大学学报(自然科学版)

1672-7207

2020

51

9

2489-2495

10.11817/j.issn.1672-7207.2020.09.014

国家自然科学基金资助项目（51977014）~~；

本校为第一且通讯机构

为保证模块化多电平换流器安全稳定运行和降低其对子模块电容的需求,针对模块化多电平换流器在网压不对称时出现的各桥臂间能量不平衡以及子模块电容能量波动增加等问题,提出一种适用于网压不对称工况下MMC桥臂能量优化控制策略。该方法在分析网压不对称工况下MMC内部能量变化的基础上,以抑制负序电流为系统控制目标,优化控制MMC桥臂电流各分量,进行相间及同相上下桥臂间能量平衡控制,并采用环流注入控制策略减小子模块电容能量波动,从能量平衡和降低能量波动2个方面优化控制网压不对称工况下MMC内部桥臂能量,实现MMC的安全稳定裕度提升,降低MMC对子模块电容的需求。最后,通过MATLAB/SIMULINK进...

In order to ensure the safe and stable operation of modular multi-level converter and reduce its demand for the capacitance of sub-module, aiming at the energy imbalance between arms and the increase of capacitance energy fluctuation of each arm under unbalanced grid condition, an optimal energy control strategy for MMC arms under unbalanced grid condition was proposed. Firstly, the energy change inside MMC was analyzed under the unbalanced grid voltage condition. Then, using the AC side current three-phase balance as the control target, the cu...