连续潮流参数选择及步长控制的分析与改进

Analysis and Improvement on Parameter Selection Strategy and Step Size Controlling in Continuation Power Flow

从算法原理及数值计算规律角度,分析了连续潮流(CPF)含参数方程解曲线在转折点附近校正过程中迭代不收敛的原因。由此,在预测切向量规格化基础上,提出改进局部参数化方法的参数选择策略,以减少局部参数化方法在校正过程中不收敛的可能性,从而提高CPF计算的鲁棒性。针对变步长算法在实际工程应用中遇到的初始参数需经试算才能确定的问题,以校正过程中迭代次数为主要参量,提出自适应变步长算法。通过对IEEE 39节点电网以及山东电网2010年冬季典型方式的算例分析,对改进算法进行了有效性验证。

Based on arithmetic theory and numerical performance regularity, this paper analyzes the reason why the computation of continuation power flow （CPF） may encounter convergence problem in the iterative correction process close to the turning point of the solution parameter curve. As a result, based on the normalized predictor tangent vector, this paper presents an improved local parameter selection strategy, which can reduce the possibility that the calculation may not converge, to improve the robustness of CPF. At the same time, in order to solve the problem that some initial parameters should be confirmed through trial and error process in engineering applications, this paper advances an automatic variable step size controlling algorithm using correction iterative times as its main parameter. Simulations on IEEE 39-bus system and Shandong Power Grid typical operation ways in the winter of 2010 verify the effectiveness of the improved method.