在基于外部静态等值的电力系统最优潮流计算中,为了保持外部等值精度,不断重新计算外部等值导纳矩阵将导致优化计算时间效率下降,文中针对ward外部等值方法的特点,从不同解决思路人手,分别采用矩阵求逆辅助定理和支路等值注入功率模型提高外部等值网络参数修正计算速度,对两种快速修正方法的修正原理和计算过程做了充分的分析和说明,以IEEE39节点系统和某538节点系统作为试验系统,验证所提方法的有效性,并对两种修正方法进行详细分析比较。
During the optimal power flow calculation of power system based on external static equivalent, in order to maintain the accuracy of external equivalent, the equivalent admittance matrices of external networks is recalculated, which reduces the efficiency of optimal computational time. According to the characteristics of Ward external equiva- lent, this paper uses inverse matrix modification lemma and branch equivalent injection power model to improve the calculation speed of external equivalent parameter correction, and the external equivalent correction principles and calculation processes of the two kinds of correction methods are analyzed and introduced in depth. Furthermore, the IEEE 39-bus systems and a 538-bus practical system are used as the test systems to validate the effectiveness of the proposed correction methods, and the comparisons between these two kinds of external equivalent correction methods are given in detail.