电力系统电压稳定极限的模型和算法

Models and Algorithms for Power System Voltage Stability Limit

电力系统电压稳定极限是直接的电压稳定裕度指标,其精确和快速计算一直是电力系统中的一个重要问题。本文提出便于利用的求解电力系统近似电压稳定极限增广潮流方程,提出了考虑各种约束条件的电压稳定极限的非线性规划模型,把电压稳定极限的求解问题转化为易于处理各种约束和能克服极限点处潮流方程雅可比矩阵奇异造成的数值计算困难的非线性规划问题,实现了考虑发电机调整约束下的电压稳定极限的精确计算。

The accurate and speedy calculation of the power system voltage limit (PSVL) is of great interest because PSVL is the most direct indicator for voltage stability margin. Based on the structure property of the load bus voltage, an approximate model and the corresponding algorithm for PSVL are proposed by power flow augmentation. A nonlinear programming model and its algorithm are proposed for PSVL with all the practical limits on PSVL considered. The application of the algorithm by N-R iteration overcomes the notoricous iteration divergence caused by load flow Jacobian singularity, and realizes accurate and speedy calculation of PSVL with generators adjustment limits.