Considering the sensitivity of virtual nodal voltage to linereactance and variation of reactive power of power grid comprehensively, the voltage instability index is put forward.
综合考虑节点电压关于线路电抗和系统无功功率变化的灵敏度，提出了电压失稳指标。
2
By means of the proposed algorithm the sensitivity of nodal voltage to any network parameter can be obtained, such as linereactance, variation of reactive power of power grid and so on.
通过该算法可得到节点电压对任何网络参数的灵敏度，比如线路电抗、电网无功功率的变化等。
3
In the special power supply model, the reactive power losses caused by the linereactance have an influence on the measurement of reactive power on both sides of the line, which is an objective fact.