REACTIVE POWER OPTIMIZATION UNDER VOLTAGE CONSTRAINTS MARGIN

Objective function of a normal reactive power optimization method is usually expressed as that network active power loss minimum under voltage constraints. It can raise the voltage of some bus too close to its boundary, thus decreasing voltage regular rate and becoming hidden trouble of system security. Unfortunately the generally ways existed to solve this problem have some defects. According to the fuzzy demand of this kind of constraints in actual system, an improved method integrated with fuzzy constraint enforcement was proposed in this paper.The mathematical model of sequential quadratic programming with fuzzy operating security constraints was deduced in detail by primal\|dual interior point method.It was showed by calculation of test system that the sequential quadratic programming method applied with fuzzy constraint used here have good property in little power loss expense as well as great extent increase of voltage security margin.