计及恢复特性负荷的电压稳定阻抗模指标研究

Research on Voltage Stability Impedance Modulus Index Considering Recovery Characteristic Load

分析了节点负荷等值阻抗和戴维南等值阻抗模值相等与最大传输功率的关系,并侧重负荷恢复特性建立了动态负荷模型。在此基础上,利用小干扰稳定分析法推导电压稳定指标,并对传统阻抗模指标进行了改进。最后,利用3机10节点系统算例比较了改进前后的阻抗模指标。理论分析和仿真结果表明,所提方法能够更为准确地指示电压稳定边界。

The relationship between the equality of node load equivalent impedance modulus and Thevenin equivalent impedance modulus and maximum transmission power is analyzed,and the dynamic load model is established focusing on load recovery characteristic.On this basis,the voltage stability index is deduced by using the small disturbance stability analysis method,and the traditional impedance modulus index is improved.Finally,an example of 3-generator 10-node system is used to compare the traditional impedance modulus index and the improved impedance modulus index.The theoretical analysis and simulation result show that the proposed method can indicate the voltage stability margin more accurately.