电力系统实用动态安全域及其搜索方法的改进

电力系统动态安全域（DSR）可为电力系统提供更为丰富的安全信息．实现电力系统的在线安全性评估与优化。经过大量的仿真实验发现，应用现有的搜索动态安全域临界超平面方法所得到的结果与理论分析得到的结果存在着很多差异。为此，分析了某些情况下应用现有实用动态安全域搜索程序昕得结果存在偏差的原因，给出其理论上的解释。并通过增加非独立节点（一般选取平衡节点作为非独立节点）约束条件和改进相应的搜索方法解决了出现的偏差问题。完善了实用动态安全域（PDSR）的方法。并在CEPRI-36节点交直流混合系统和太平洋联络线交直流并联输电系统算例上进行了验证，得到了满意的结果。改进后的实用动态安全域及其搜索方法使动态安全域超平面的搜索更加精确，对实际系统更具有指导意义。

Improvement on Practical Dynamic Security Region and Its Searching Method of Power System

The method of dynamic security region(DSR) can give comprehensive security information of power system.On-line estimation and optimization about power system security can be realized by this means.In fact,results of existing DSR critical hyper-plane searching method are different from those of theoretical study.This paper analyzes the reasons for the difference under some circumstances,offers theoretical explanation and gives the resolving way.An improved practical dynamic security region(PDSR) method with a new restriction(restriction of balance node) is proposed.In addition,the searching method of PDSR is improved too.The paper provides case studies using both CEPRI-36 bus system and Pacific AC/DC system in the Western U.S.power system.The result is satisfying.The improved PDSR and the searching method thereof enable more accurate searching of DSR hyper-plane,and are more helpful to actual power system.