In this study, an estimation approach based on local bus measurements of voltage, current and phase angle is presented to assess voltage stability at any of the system load bus. For this purpose, Thevenin equivalent circuit parameters of the IEEE 30-bus standard test system are estimated by using local measurements from Bus k which is selected to be evaluated in terms of voltage stability. Estimated Thevenin equivalent circuit parameters are used to calculate critical voltage values and voltage stability margin values of Bus k online for the voltage stability assessment. In conclusion, the voltage stability margin results of the proposed approach are compared with three different Thevenin equivalent based voltage stability estimation approaches. Simulation results show that the proposed approach successfully estimates the voltage stability margins of any load bus in the system. From the perspective of voltage stability, estimated voltage stability margins can be used to assess the loading levels of any load bus, to define critical busses and to make decision for load shedding.

在这项研究中，提出了一种基于电压，电流和相角的局部总线测量值的估计方法，以评估任何系统负载总线上的电压稳定性。为此，通过使用来自总线k的局部测量值来估算IEEE 30总线标准测试系统的戴维南等效电路参数，该电压值将根据电压稳定性进行评估。估计的戴维宁等效电路参数用于计算总线k的临界电压值和电压稳定裕度值在线进行电压稳定性评估。总之，将所提出的方法的电压稳定性裕度结果与三种不同的基于戴维宁当量的电压稳定性估计方法进行了比较。仿真结果表明，该方法成功地估计了系统中任何负载母线的电压稳定裕度。从电压稳定性的角度来看，估计的电压稳定性裕量可用于评估任何负载母线的负载水平，定义关键母线并做出减载决策。