SVC和TCSC提高电压稳定性作用的动态分析

DYNAMICAL ANALYSISOF THE EFFECTSOF SVC AND TCSC ON VOLTAGE STABILITY

采用小扰动分析法和非线性动态方法中的分岔等概念对 SVC和 TCSC提高电压稳定性的作用进行了全面的分析。研究了由 SVC和动态负荷相互作用引起的 Hopf分岔现象 ,并对 SVC和TCSC时间常数的选择进行了讨论。分析表明 ,在简单系统中 ,TCSC比 SVC更能有效地提高系统的电压稳定性 ;TCSC时间常数的变化比 SVC时间常数的变化对电压稳定功率极限影响小 ;装设SVC和 TCSC后可以显著地增大系统的电压稳定功率极限。在考虑 SVC或 TCSC动态的情况下 。

The effects of static VAR compensator (SVC) and thyristor-controlled series capacitor (TCSC) on preventing voltage collapse are analyzed comprehensively by small signal method and nonlinear dynamic method. Hopf bifurcation caused by the interactions of SVC and dynamic load is explored. The choice of the value of time constants for SVC and TCSC are also discussed in detail. It is shown that TCSC is more effective than SVC in preventing voltage collapse in a simple power system, and the variation of the value of time constant of TCSC has less effect on critical power of small signal voltage stability compared with that of SVC. Furthermore, the critical power of voltage stability of system is increased when SVC or TCSC is installed. The nose point of PV curve is not certainly the voltage instability point of the system with SVC or TCSC. This project is supported by National Natural Science Foundation of China (No. 59807004) and the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, China.