基于多桥脉冲宽度调制(PWM)交流控制技术的静止移相器

STATIC PHASE SHIFTER BASED ON MULTI BRIDGE PWM AC CONTROLLER

介绍一种基于脉冲宽度调制（ＰＷＭ）交流控制技术的新型静止移相器。对单桥ＰＷＭ移相器在１个开关周期中的３种工作模式进行了理论分析，推导了旁路电容及吸收电阻的参数设计公式；提出采用多桥叠加结构的交流控制器抑制大容量ＰＷＭ移相器的自身谐波发生量、降低装置开关频率及开关损耗；推导得出了多桥ＰＷＭ交流控制器的电压转移函数以及多桥移相器的线路注入电压表达式；通过计算机仿真分析及物理模型实验，验证了理论推导结果的正确性。

A new static phase shifter based on PWM AC controller is presented in this paper. Aanalyses theoretically the three modes in one switching cycle of single bridge PWM phase shifter, and gives paramenter design formula of bypass capacitor and bleeder. Proposes a new multi bridge AC controller to restrict the harmonics generated by PWM phase shifter, and reduce switching frequency and loss. Develops the voltage transfer function of the multi bridge AC controller and the expression form of the multi bridge phase shifter line injected voltage. The theoretical analysis is demonstrated through simulating and experimental results.