信息不确定性对电网无功优化的影响

THE IMPACT OF PARAMETER UNCERTAINTY ON REACTIVE SOURCE OPTIMIZATION

提出了一种分析不确定信息对电网无功优化影响的方法,文中运用双层优化原理,建立以网损最小化为上层优化目标、以满足电压约束条件为下层优化目标的电网无功优化模型,并得出双层无功优化最优解异于单层无功优化最优解的条件和判据。同时应用该优化方法对IEEE9节点和浙江某101节点地区电网进行了计算和分析,结果表明:该方法提供了一种计及不确定因素影响下求解电网无功优化问题的新模型,在考虑了负荷变动因素后,所得出的无功优化方案比未计及负荷变动时的方案冗余度大,能够适应在给定负荷区间情况下电压无功控制优化的需要。

A new method, which can evaluate the impact of uncertainty on reactive source optimization, is presented in this paper. This method makes use of bi-level optimization. In the proposed mathematical model, the sum of transmission loss under mean parameter settings is minimized in the upper level optimization, while the lower level optimization ensures that voltage constraints are satisfied even under the worst case parameters. The numerical results of an IEEE 9-bus system and a 101-bus test system are provided to demonstrate the possible applications of the proposed method. It is proposed that the scheme of reactive source optimization, which takes load variation into account, is more redundant and flexible than the scheme without considering load variation.