基于差补调制方式的电网连锁故障协调控制

Coordinated Control of Power Grid Cascading Failures Based on Differential Compensation Modulation

为控制电网连锁故障的发生,提出基于差补调制方式的电网连锁故障协调控制方法。通过潮流分布探析与初始故障选取,采用故障链环节的隐式触发与显式触发策略,进行下一重故障触发,将故障链中间环节的生成概率转换为功率,构建故障链影响函数,利用相关参数指标的加权值,计算非故障线路预测值;经过相位互差180°的参考波,实施双极性调制,完成线路输出优化,令差补调制方式的协调控制得以实现。仿真结果表明,上述方法不仅缩短了损失负荷故障控制时长,还减小连锁故障的损失负荷规模,降低故障线路的负载率,有效抑制了关键线路的开断对电网带来的连锁过载反应。

In order to control the cascading failures, a coordinated control method based on differential pulse width modulation was put forward. Through the analysis of power flow distribution and the selection of initial faults, the implicit and explicit triggering strategies of the fault chain were adopted to trigger the next fault. After that, the generation probability of the intermediate link of the fault chain was converted into power, and the influence function of the fault chain was constructed. Moreover, the predicted value of the non-fault line was calculated by the weighted values of relevant parameters. Through the reference wave with 180° phase difference, the bipolar modulation was implemented. Meanwhile, the line output was optimized. Finally, the coordination control of differential pulse width modulation was realized. Simulation results show that the proposed method not only shortens the time of controlling loss load failure but also reduces the loss load scale of cascading failure. In addition, this method reduces the load rate of faulty lines and effectively suppresses the cascading overload reaction caused by the key line outage to the power grid.