两种柔性直流输电技术的比较研究

Comparation and Research for Two Flexible HVDC Methods

介绍了HVDC-light和HVDC-plus两种柔性直流输电技术的基本原理,从换流器的谐波、桥臂控制、桥臂设计三方面对两种技术路线进行了比较研究。结果表明,HVDC-light的桥臂控制相对简便,在实现相同容量传输时,所需绝缘栅双极晶体管(IGBT)的数量更少;HVDC-plus换流器电压谐波含量较低,一般不需要配置专门的滤波器,电磁辐射较低,桥臂的结构设计更加灵活。

This paper introduces the principals of two flexible HVDC methods： HVDC-light and HVDC-plus. By comparing the converter harmonics, converter arm controlling, and converter arm design, this paper summarizes the differences between these two methods. The controlling of HVDC-light converter arm is more convenient. Moreover, HVDC-light needs less IGBT when transmit same power. HVDC-plus converter generates fewer harmonics; therefore, harmonic filter is not necessary in normal conditions, electromagnetic radiation is comparatively low. At the same time, HVDC-plus converter arm design is more flexible.