中国电机工程学报Issue(10)：2567-2575,9.DOI:10.13334/j.0258-8013.pcsee.2015.10.024
模块化多电平换流器PR环流抑制器优化设计
Optimal Design of PR Circulating Current Suppressing Controllers for Modular Multilevel Converters
摘要
Abstract
The modular multilevel converter (MMC) is a suitable topology for voltage source converter high-voltage direct-current (VSC-HVDC) power transmission system. The MMC topology has already been used in some VSC-HVDC projects. The performance of MMC is affected directly by the circulating current which is flowing in arms of the valve. The circulating current can be suppressed by the proportional resonant controller (PR controller). However, the stability needs to be enhanced. This article proposed an optimization design of PR circulating current suppressing controllers. An arm current proportional negative feedback was added in PR circulating current suppressing controllers to enhance the stability of the system and the fast circulating current suppressing ability. The additional negative feedback control is simple in realization. The self-balanced ability of the capacitor voltage in upper and lower arms can also be improved by this supplementary control strategy. The system stability was analyzed through the establishment of the close-loop transfer function. Meanwhile, the promotion of the capacitors self-balanced ability was validated through the establishment of Lyapunov function. A simulation model was established in PSCAD/EMTDC simulation environment. The simulation result verified the effectiveness of this supplementary strategy. The stability of the system is improved and the self-balanced ability of the capacitor voltage in upper and lower arms is enhanced.关键词
模块化多电平换流器/环流抑制/比例谐振控制器/比例负反馈/稳定性分析/电容电压自平衡Key words
modular multilevel converter/circulating current suppressing/proportional resonant controller (PR controller)/proportional negative feedback/stability analysis/self-balanced ability分类
信息技术与安全科学引用本文复制引用
苑宾,许建中,赵成勇,何智鹏,庞辉,马巍巍..模块化多电平换流器PR环流抑制器优化设计[J].中国电机工程学报,2015,(10):2567-2575,9.基金项目
国家自然科学基金项目(51177042)；国家863高技术基金项目(2013AA050105)。Project Supported by National Natural Science Foundation of China (51177042) （51177042）
The National High Technology Research and Development of China 863 Program (2013AA050105) （2013AA050105）
