改进的电力系统预想开断事故潮流算法

Improved Breaking Power Flow Algorithm in Power System Predictive Contingency Security Analysis

在电力系统故障准确分析的研究中,为解决电力系统预想事故分析的开断潮流在线计算问题,提出了一种基于节点电压分布因子法的电网开断潮流计算算法。为提高在线计算速度,通过利用补偿法的思想对发生开断事故后的节点注入电流进行等效修正,避免传统分布因子法需要根据每次开断后电网结构,重新生成阻抗矩阵的过程;同时将研究对象从传统的功率潮流转向节点电压,以适应当今输电网络设有较大冗余这一特点,导出关于新的节点电压的分布因子表达公式。最后以节点测试系统进行仿真,与常规牛顿法开断潮流计算结果的仿真对比验证,证明其准确性。

An online load flow calculation method is presented based on the node voltage distribution factor meth- od for predictive contingency. To improve the online computation speed, the equivalent node injection current is ad- justed by using the ideas of compensation, which can avoid the process to create the new impedance matrix in the tra- ditional methods according to the network structure. At the same time, the object of study is changed from traditional power flow to node voltage, in order to adapt to the current transmission network with the feature of larger redundancy. The new distribution factor expression formula is deduced. Simulation results verify the correctness of the proposed method.