支路故障后静态电压稳定裕度的估算

提出一种支路故障后静态电压稳定裕度的估算方法。该法先通过2阶灵敏度法对支路故障后电压稳定临界点处的状态变量进行预估,并通过预估的状态变量求出故障后电压稳定临界点处的注入功率;然后将该注入功率等效成正常条件下初始运行点处注入功率的变化量,并根据该等效的变化量来预估故障后负荷裕度的变化,避免了因负荷裕度对支路导纳线性灵敏度差而导致预估精度不高的缺点;最后在IEEE14和30节点系统上验证了所提方法的有效性。

A Method to Estimate Static Voltage Stability Margin After Branch Outage

A method to estimate static voltage stability margin after branch outage is proposed.Firstly,the state variables of the critical point of voltage stability after branch outage is pre-estimated by second order sensitivity,and based on the pre-estimated state variables the post-fault injected power at state variables of the critical point are solved;then the injected power is equivalent to the variation of the injected power at initial operating point under normal conditions,and according to this equivalent variation the variation of post-branch outage load margin is pre-estimated to avoid the defect of insufficient pre-estimation accuracy due to low linear sensitivity of load margin to branch admittance.The effectiveness of the proposed method is verified by simulation results of IEEE 30-bus system.