一种基于48脉波电压源逆变器的静止同步串联补偿器及其控制系统的设计与建模(上)

本文详细阐述了基于48脉波电压源逆变器的静止同步串联补偿器（SSSC）的实现，控制系统设计及建模，在8个三相逆变器的输出电压回路中增加了一个电磁回路，该回路由18个单相三绕组变压器和6个单相双绕组变压器组成，基于这个电路设计，提出了对应的等值回路模型及相应的比例积分（PI）控制方案，比例积分控制器的增益是通过对IEEE第一个次同步谐振分析模型（FBM）进行特征根分析而确定的。仿真结果表明控制器的增益选择至关重要。不当的增益会引起轴系扭矩增大而发生振荡。

MODELING AND CONTROL DESIGN OF A 48-STEP INVERTER BASED STATIC SYNCHRONOUS SERIES COMPENSATOR

The design,modeling and control design of a 48-step inverter based static synchronous series compensator is presented in this paper,A magnetic circuit is chosen which contains eighteen single-phase three winding transformers and the six single-phase two winding transformers to add the output voltage of eight three-phase inverters. An equivalent circuit niodel of the SSSC is derived and based on this model a proportional-plus-integral controller is proposed. The controller gains are chosen through eigenvalue analysis of the IEEE first benchmark model(FBM)for subsychonous resonance(SSR)analysis. The SSSC model,its control and the results of the eigenvalue analysis are then validated through simulation. It is shown that for certain controller gains torque amplification of shaft modes can occur.