基于MMC的STATCOM直流侧电压均衡控制的研究

于飞; 李梅航; 陈朋; 王红蛟

引用本文:	于飞,李梅航,陈朋,等.基于MMC的STATCOM直流侧电压均衡控制的研究[J].电力系统保护与控制,2014,42(11):130-135.
	YU Fei,LI Mei-hang,CHEN Peng,et al.DC capacitor voltage balancing control for STATCOM based on MMC[J].Power System Protection and Control,2014,42(11):130-135

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基于MMC的STATCOM直流侧电压均衡控制的研究
于飞¹, 李梅航¹, 陈朋², 王红蛟¹
1.青岛科技大学自动化与电子工程学院，山东青岛 266042;2.许继集团，河南许昌 461000

摘要:

由于MMC特殊的拓扑结构，基于MMC的STATCOM有很多的优点，但这种拓扑也使得电容电压平衡控制成为难点。针对MMC STATCOM直流侧电容电压不平衡问题，通过分析MMC STATCOM的数学模型，基于解耦变换将有功和无功解耦分离，提出通过系统直流电压控制和基于排序的均压控制来平衡其直流侧电容电压的策略。系统直流电压控制用来确定电容电压稳定基准值和有功功率的交换，基于排序的均压策略用来平衡每个桥臂上所有子模块的电容电压。通过Matlab/Simulink仿真表明，该方法可以有效地稳定STATCOM直流侧电压。

关键词: MMC STATCOM DWPM 双环控制直流电压控制均压控制

DOI：10.7667/j.issn.1674-3415.2014.11.021

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基金项目:

DC capacitor voltage balancing control for STATCOM based on MMC

YU Fei¹, LI Mei-hang¹, CHEN Peng², WANG Hong-jiao¹

1.Qingdao University of Science & Technology, Qingdao 266042, China;2.XJ Group Corporation, Xuchang 461000, China

Abstract:

Due to its unique topology, the STATCOM based on MMC has many advantages, but this unique topology also makes the voltage balancing control of DC side capacitors more difficult. Aiming at the DC side capacitor voltage unbalancing of STATCOM, through the analysis of MMC STATCOM mathematical model, decoupling separation of the active and reactive based on the decoupling transformation, a strategy of DC voltage control and voltage-sharing based on sort algorithm to balance the DC side capacitor voltage is proposed. The steady value of capacitors voltage and active power exchange are determined by the DC voltage control and the capacitor voltage balanced by voltage-sharing based on sort algorithm. Simulation results show that this method can effectively stabilize the DC side’s voltage of the MMC STATCOM.

Key words: MMC STATCOM DPWM double loop control DC voltage control balanced voltage control

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