UPFC动态模型在电力系统动态分析中的实现

REALIZATION OF UPFC DYNAMIC MODEL IN DYNAMIC ANALYSIS OF POWER SYSTEM

在计及直流电容器动态的UPFC动态模型的基础上，引入交替迭代法实现了UPFC动态模型与电力系统的接口。应用这种接口处理方法，对含UPFC的电力系统进行了动态仿真分析。仿真过程中，UPFC的并联侧控制为定端电压控制和定直流电容电压控制，而串联侧为定线路功率控制或定串联补偿控制。仿真结果表明在UPFC动态模型中计及电容器充放电动态的必要性，以及接口算法的有效性。并且可以看出不同的控制系统下UPFC的控制性能差别很大，反映了UPFC在系统中的应用效果对其控制系统的依赖性。

Based on the UPFC dynamic model considering the charging dynamics of its DC link capacitor. a novel method ofalternative iteration is introduced to handle the interface between the UPFC and the power network. The UPFC controlsystem is also discussed. Its shunt side control. i. e. terminal voltage control and firing angle control of converter 1, is tokeep constant the UPFC terminal bus voltage magnitude and the UPFC DC capacitor voltage. respectively. Its series sidecontrol, i. e. terminal voltage control and firing angle control of converter 2. is to keep constant the real power and reactivepower of the line with UPFC or to act as a series compensator. The simulation test has been conducted on a 4-generator2-area system. The results show that the proposed UPFC dynamic model and the UPFC-network interface work very well insystem transient stability analysis, and that the different control strategies of UPFC might have apparently different effects onsystem stability performance.