全控器件励磁系统改善电力系统阻尼特性的研究

摘要

全控器件励磁系统能够拥有两条通道为电力系统提供阻尼:励磁控制以及无功注入.本文着重研究无功注入改善电力系统阻尼特性的能力.在介绍了基于电压源型换流器(Voltage Source Converter,VSC)的全控器件励磁系统的基本结构及其等效模型的基础之上,建立了装有全控器件励磁系统的单机无穷大系统的Philips-Heffron模型,并运用相位补偿法设计了无功注入控制器.仿真结果表明,与常规励磁系统相比,全控器件励磁系统能够更加有效地阻尼电力系统低频振荡和维持系统稳定.%The excitation system based on fuli-controlled-devices has two channels to provide damping for power system: excitation control and reactive power injection. This paper focus on the capability of reactive power injection improves system damping characteristic. Typical topology of the excitation system based on voltage source converter (VSC) is introduced, and its equivalent model is deduced, Then the Philips-HeSron model of a single- machine infinite-bus power system installed with the excitation system based on fuli-controlled-devices is established. The phase compensation method is applied to design the reactive power injection controller. Simulation results show that the excitation system based on fuli-controlled-devices can damp low frequency oscillations and maintain system stability more effectively than conventional excitation system.