After introduced the technical significance and key elements of FACTS, The paper has studied the principles of thyristor controller phase shifter (TCPS) modifying the magnitude and the phase angle of node voltage.

• 本文在简要介绍FACTS的技术意义和主要元件的基础上，对晶闸管移相器(简称TCPS)改变系统节点电压的幅值和相位的原理进行认真的研究。