基于多阶轨迹灵敏度的交直流混联受端电网无功储备优化方法

Reactive power reserve optimization method for AC/DC hybrid receiving network based on multi-order trajectory sensitivity

电网在换相失败发生期间,会消耗大量的动态无功功率,一旦发生换相失败故障,容易对电网安全运行产生影响。在此背景下,研究如何通过优化交直流混联电网的无功储备,来降低直流换流器换相失败事故扩散的风险。首先,建立交直流混联系统的微分代数方程,在一阶轨迹灵敏度基础上,求取系统的多阶轨迹灵敏度;然后,针对电力系统当前的运行状况,建立含发电机和容抗器的动态无功储备优化模型,求解得到动态无功储备优化的最优解;最后,以某实际系统为模型进行仿真验证,证明该方法的可行性与有效性。

During the process of the commutation failure in power grid,a large amount of dynamic reactive power are consumed.Once a commutation failure occurs,it affects the safe operation of the grideasily.Under the background,anreservereactive poweroptimization for AC-DC hybrid power gridsisproposed to reduce the risk of accidental DC commutation failure propagation.Firstly,a differential algebraic equation for the AC/DC hybrid system is established.The multi-order trajectory sensitivity of the system is obtainedon the basis of the first-order trajectory sensitivity.According to the current operating conditions of the power system,a dynamic reactive power reserve optimization model including a generator and a reactor is then established,and the optimal solution of the dynamic reactive power reserve optimization is solved.Finally,a practical system ismodeledto verify the feasibility and effectiveness of the method.