Study On Improved Continuation Power Flow Algorithm

Power transfer capability provides valuable measurement to the security and reliability of interconnected power systems. Along with the developments of power market, transfer capability possesses signal function of market. Thus how to calculate the transfer capability quickly and precisely and how to satisfy the demand of power load furthest become a challenging task under the precondition of security and reliability.This paper presents a computational method to determine the available transfer capability constrained by voltage stability limit. Firstly it summarizes the continuation power flow method which most widely applied in power system. It concretely analyzes the method of partly parameterized and radian parameterized. It introduces an algorithm which combines continuation method with optimization method in considering about generator power constraint.This paper particularly demonstrates the elements of computing the power transmission limit through constraint exchange points, evaluates these points' pattern by use of immediate stability analysis.This paper aims at the problem of traditional continuation power flow whose computing time is too long in considering about generator reactive power limit, presents a new algorithm, establishes the model to calculate the maximum transfer capability, and deduces the formula and compile program. The method puts constraint conditions into the approach directly, computes constraint exchange point, and then evaluates reliability of these points. So it has good convergence character and costs less time. At last this paper validates the method through three IEEE examples and certain practical example. Computing time of the method has greatly decreased in contrast to traditional continuation power flow method, which confirms its superiority and practicality.