基于新型电力系统仿真工具的UPFC建模研究

Modeling research of UPFC with novel power system toolbox

为了建立多机电力系统中统一潮流控制器(UPFC)的稳态及动态模型,提出了一种基于新型电力系统仿真工具箱(PST)的新方法.该建模方法对UPFC的稳态模型、动态模型及其接口采用模块化设计,在UPFC稳态潮流模型中,将并联逆变器连接母线设为发电机节点、串联逆变器则设为负荷节点;在UPFC动态模型中,则采用常用的串、并电压源模型,并考虑到直流电容的动态充放电过程.时域仿真结果表明,所提建模方法在多变量控制器设计中能有效地模拟UPFC的动稳态特性,且该方法与基于Matlab开发环境的PST仿真工具相结合,具有设计简便、易于拓展的优点.

To establish the static and dynamic models of unified power flow controller （UPFC） in multi-machine power system, a novel approach based on a new type of power system simulation toolbox （PST） was proposed. The modularization design on the steady, dynamic models and the interface of UPFC was employed in the proposed approach. By taking shunt inverter bus as a generator bus and series inverter bus as a load bus in the steady model, UPFC was split into two injections of nodal power. Considering the dynamic changing process of direct current capacitance, series and shunt voltage sources model in common use were adopted into the dynamic model of UPFC. The time-domain simulation results demonstrate that the .proposed approach can effectively simulate the steady and dynamic characteristics of UPFC in the multivariable controller design. The proposed approach based on PST developed in Matlab is simple, convenient and easy to be extended.