电力系统优化运行的电压安全成本研究

利用模糊建模方法处理可松弛约束的能力,提出一种估计电力系统电压安全成本的新方法。该方法可在一定程度上解决确定最小电压安全裕度指标的困难,通过最小电压安全裕度模糊参数,实现对该指标的松弛处理。在此基础上,建立了计及最小电压安全裕度指标的最优潮流模糊模型。采用预测-校正原对偶内点法求解该优化模型。通过对IEEE标准测试系统的仿真结果分析表明,该方法不仅可以实现系统总发电成本的最小化,同时还可以维持尽可能高的电压安全裕度,而且在系统运行低于规定的最小电压安全裕度时,通过电压安全成本的大小反应了维持系统电压安全所必须付出的经济代价。

Research on voltage security cost in optimal operation of power system

A new method to evaluate voltage security cost is presented using the capability of fuzzy modeling method in dealing with relaxed constraints.This method can deal with the difficulties of determining minimum voltage security margin index to a certain extent.The relaxation of this index can be realized by a fuzzy parameter.The fuzzy OPF formulation considering minimum voltage security margin index is proposed on this basis.The predictor-corrector primal-dual interior point method is used to solve this formulation.Test results from IEEE systems show that this method not only maintains voltage security margin as large as possible while minimizing total generation cost,but also reflects the expense of keeping the system voltage security when the system operates below the minimum voltage security margin through the value of voltage security cost.