基于电网脆弱性和经济性评估的PMU最优配置新方法

A New Method for Optimal PMU Configuration Considering Vulnerability of Power System and Economy

基于GPS时钟同步技术的同步相量测量装置(phasor measurement unit,PMU)为直接观测电力系统的动态行为提供了重要手段。若电网发生N 1故障,传统的PMU配置不能满足全网可观的要求。若考虑N 1情况,PMU配置个数较传统配置多,成本大大增加。针对上述问题,提出一种新的PMU最优配置方案。该方案利用广义特勒根定理对电网母线与支路进行脆弱度分析,然后对全网进行PMU配置及考虑N1情况的PMU配置。通过脆弱度排序、经济指标、鲁棒性分析,确定PMU配置新方案。以IEEE 14标准节点系统为算例,验证了该方法的可行性。

At present the phasor measurement unit （PMU） based on clock synchronization technology becomes an important technical means to observe dynamic behavior of power system directly. When power system is in the N-1 failure state, traditional configuration of PMU cannot meet the demand of ＂whole system observable＂. If the condition of N-1 failure state is taken into account during the configuration of PMU, more PMUs should be configured than traditional configuration and the cost for the configuration will evidently increase. In allusion to it, a new optimal scheme for PMU configuration is proposed. Firstly, the vulnerability of power system and its branches is analyzed by generalized Tellegen＇s theorem; then the PMU configuration of the whole system and the PMU configuration considering N-1 failure state are performed; finally through the sorting of vulnerability and analyzing economic index and robustness, the configuration of PMU is determined. The feasibility of the proposed method is verified by simulation results of IEEE 14-bus system.