复功率注入空间中电力系统的实用动态安全域

Practical Dynamic Security Region in Complex Power Injection Space

为研究复功率注入空间中实用动态安全域的边界性质,针对多个典型电力系统,通过大量的仿真研究表明,在网络中不同位置发生持续不同时间的短路事故时,复功率注入空间中暂态稳定的临界点的集合可以使用一个或极少数几个超平面来近似描述．在包含暂态电压失稳现象的稳定问题研究中,复功率空间中的实用动态安全域具有更好的精度．文中详细讨论了这些近似描述与真实边界之间的差异并发现了实用动态安全域边界的迁移规律,上述研究大大拓宽了实用动态安全域适用的范围．最后通过对某电力大系统实用动态安全域的研究,验证了上述结论．

To investigate the boundary characteristics of practical dynamic security region（PDSR） in complex power injection space, several typical power systems with different fault locations and different fault durations are studied by simulation. It is found that PDSR in complex power injection space is to be surrounded by the hyperplanes vertical to coordinate axes and one or a few critical hyper-plane （HP） boundaries, where the former hyper-planes represent upper and lower limits of the node injections and the latter hyper-planes describe critical points of transient stability. PDSR in complex power injection space is more precise than the one in active power injection space, especially in the studies of power system transient voltage stability. Differences between real boundaries and the approximate critical HP boundaries are addressed in detail and some beneficial results about displacement characteristics of the critical HP boundaries are found, which greatly extends the usages of PDSR. Finally, through studies on PDSR of a bulk power system, the above conclusions are further confirmed.