摘要
静止同步补偿器(static synchronous compensator,STATCOM)普遍采用链式结构,换流链由若干结构相同的H桥链节级联组成。链节直流电压的稳定是保障装置可靠运行的必要条件。通过对换流链功率方程的分析,阐述实现换流链相间直流电压平衡控制的基本数学原理,提出一种基于负序电流的相间直流电压平衡控制思想,并考虑了系统电压不平衡的影响。仿真分析和工业样机实验表明,所提计及系统电压不平衡的链式STATCOM相间直流电压平衡控制策略,具有稳态精度高、抗扰性好、暂态和动态性能优越的特点,能有效解决链式换流器直流电压平衡控制难题。
Chain structure is widely used in static synchronous compensator（STATCOM）,which is composed of several H-bridge modules with identical structure.The stability of DC voltage of each converter determines the stability of the device.This article analyzed the converter chain power equation,sets forth the basic mathematical principles to achieve DC voltage balance control among the converter chains,and put forward an averaging DC voltage control strategy based on negative sequence current.The scheme also took system unbalanced voltage into consideration.Simulation results and industrial prototype tests show the high steady-state control accuracy and excellent transient and dynamic performance of the proposed control strategy,thus proves it to be an effective solution to the chain converter DC voltage control problems.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第34期36-41,7,共6页
Proceedings of the CSEE
关键词
换流链
直流电压
负序电流
直流电压平衡控制
converter chain
DC voltage
negative sequence current
average DC voltage control
