SVC控制引起的电压振荡失稳研究

在发生电压崩溃的单机-动态负荷系统中，采用传统SVC控制器（静止无功补偿器）提高其电压稳定性：研究表明SVC控制可以延迟系统鞍结分岔点，大大提高系统电压稳定性。但新状态变量的引入改变了系统特性，使得系统在发生鞍结分岔之前，先经历一个Hopf分岔。时域仿真表明，此Hopf分岔诱导系统发生振荡型电压失稳，系统的负荷极限由Hopf分岔参数决定。因此，在使用FACTS控制器提高系统电压稳定性时，要详细考虑其对系统中各种分岔的影响，综合优化控制器的设计和安装。

An oscillatory voltage instability induced by SVC control

This paper adopted the SVC controller to enhance voltage stability in a single-machine dynamic-load system. which had a voltage collapse phenomenon. The analysis indicated that SVC control could delay saddle-node bifurcation point and enhance voltage stability greatly. However, a new state variable was introduced to this system and induced a new bifureation-Hopf bifurcation before saddle-node bifurcation. Time domaiu simulations indicate that system will suffer the oscillation voltage instability when Hopf bifurcation happens and the loading margin of this system is determined by Hopf bifurcation parameter. Therefore, it is essential to optimize synthetically the designs and instalments of the FACTS controllers by taking account of all the effects introduced by them on system bifurcations.