中文摘要：

合理的无功功率补偿对于输配电系统非常重要。无功补偿装置已经由同步调相机、并联电容器发展到基于大功率电力电子器件的静止补偿装置。静止同步补偿器（STATCOM）是目前用于电力系统中性能较好的无功补偿装置,是柔性交流输电系统（FACTS）的核心。主要介绍了STATCOM的基本原理,指出了其与SVC相比所存在的优势以及STATCOM的发展现状及趋势。随着各电力用户对动态电压质量要求的不断提高,STATCOM必将在电力系统中得到更为广泛的应用。

英文摘要：

At present,the power system is lack of var compensation,furthermore most compensation methods for the compensation devices are not good enough to meet the requirement of compensation for pow-er system.The static synchronous compensator（STATCOM）is a reactive power compensation with the prefer-able performance in the power system up to now,which is a critical technique for the flexible alternative cur-rent transmission system（FACTS）.STATCOM is a voltage source inverter connected to the system by trans-former or inductance,dynamic reactive power compensation is achieved by regulating phase and amplitude of the voltage or the current injected into power system.The present status and future development trend of STATCOM at home and abroad are introduced.The fundamental principle of compensation and the ability of STATCOM to support voltage is more competent than SVC are summarized in detail.That cascade multilevel inverter is not only for fewer devices,but also superior in performance is pointed out.With the increasing de-mands on the dynamic voltage quality,STATCOM will be used extensively in the power system.