基于概率不安全指标的电力系统紧急控制

基于动态安全域的最优紧急控制模型可以对各紧急控制的效果进行量化评估。鉴于现代电力系统各种随机事故对系统稳定性的影响日益增大,提出了基于概率不安全指标的紧急控制模型。首先利用最优紧急控制模型得到最优方案并据此形成控制方案集,然后利用概率不安全指标模型计算各方案的不安全概率,最后选出符合系统要求、控制成本最小的方案作为系统的紧急控制方案。通过10机39节点新英格兰系统进行验证,可以得到控制成本相近但系统不安全概率由0.51%降低到0.12%的控制方案。表明了所提出控制模型的有效性。

Power System Emergency Control Based on Probabilistic Insecurity Index

The optimal emergency control model based on DSR can evaluate various emergency control strategies with quantitative index.A probabilistic analysis method is presented in this paper as the influence of random factors on system stability becomes more and more serious.Firstly,the optimal control strategies for various faults are obtained using the model.On that basis,the control scheme set is formed.Then,probabilistic insecurity indexes of all the strategies are calculated.Finally,the optimal control scheme which has the lowest control cost is selected as the control decision.Case study on the New England 10-generator 39-bus test system shows that a control scheme which has a control cost as much as the traditional method can reduce the system insecurity probability from 0.51% to 0.12%,so the validity of the proposed method is proved.