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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。
Static synchronous compensator (STATCOM) commonly used chain structure, the commutation chain consists of a number of structurally identical H-bridge link cascade composition. The stability of the DC link voltage is a necessary condition for reliable operation of the device. Based on the analysis of power equation of converter chain, the basic mathematical principle of DC voltage balance control between converter chains is expounded. A control idea of phase DC voltage balance based on negative sequence current is proposed, and the influence of system voltage unbalance is considered. Simulation analysis and industrial prototype experiments show that the proposed AC-DC voltage balance control strategy of chain STATCOM has the characteristics of high steady-state accuracy, good immunity and superior transient and dynamic performance, which can be effectively solved Chain converter DC voltage balance control problems.