Development and real time implementation of a synchrophasor based fast voltage stability monitoring algorithm with consideration of load models

With ongoing smart electric grid development, several algorithms have been developed that make use of synchrophasor technology for online wide area voltage stability monitoring. Most of these algorithms have several advantages, but at the same time also have some limitations. Measurement based algorithms are generally based on iterative approach to estimate system parameters to compute proximity to voltage stability margin. There is a need for fast and robust online voltage stability algorithm utilizing synchrophasor measurements. This paper discusses briefly about limitations of few existing online voltage stability algorithms and presents a new real time algorithm for voltage stability monitoring based on local measurements only, which also considers detailed load models. Developed algorithm has been tested offline and online on different IEEE standard test cases under different scenarios. Simulation results show satisfactory performance.