考虑机组恢复成功率的黑启动阶段待恢复机组优选

Optimal Restoration Unit Selection Considering Success Rate During Black Start Stage

待恢复机组的选择是制订黑启动方案的首要任务。分析了影响黑启动阶段机组成功恢复的主要因素,其中重点分析了变压器空载投入时励磁涌流引起的黑启动机组机端电压波形畸变的影响。在此基础上,定义了线路权重、变压器权重和辅机权重,提出了黑启动阶段机组恢复成功率的概念。综合考虑机组恢复成功率和机组容量等因素,对黑启动阶段待恢复机组进行优选。为了减小计算量,首先从所有待恢复机组中筛选部分机组作为寻优集合,并使用前K最短路径算法搜索寻优集合中机组的可选恢复路径。山东电网实际仿真证明了定义的机组恢复成功率的有效性和所述方法的快速性。

The primary task of making a black start plan is to select the to-be-restored unit. The main factors which have an impact on unit restoration are analyzed, especially the terminal voltage waveform distortion of black start unit caused by inrush current when no-load transformers are switched on. Based on the above analysis, the line weight, transformer weight and auxiliary motor weight are defined and the concept of success rate of unit restoration is proposed. The success rate of unit restoration and the capacity of units are considered to select the optimal to-be-restored unit during the black start stage. To reduce the computation burden, several units are selected as a candidate set, whose restoration paths are obtained by the algorithm of K-shortest paths. Simulation results of Shandong power grid show the effectiveness of the success rate of unit restoration and the rapidity of the proposed method. This work is supported by National High Technology Research and Development Program of China （863 Program） （No. 2011AA05Al18） and National Natural Science Foundation of China （No. 50877044）.