The phenomenon of Voltage instability is a major contributor to blackouts. Thus, monitoring the voltage stability of the power grid is necessary to ensure its secure operation. This seminar presents an application of the Phasor Measurement Units (PMU) to monitor the voltage stability of the grid, specifically monitoring long term voltage stability. Traditionally, the idea of thevenin equivalent has been used for estimating long term voltage stability using PMU data. However, there has been no theoretical justification for using the thevenin equivalent for multi-bus systems. In the seminar, I will present an analytical relation between the thevenin equivalents and the power system jacobian. This relation will then be used to validate the thevenin index at the PMU in a robust manner and detect anomalous data from the PMU. Furthermore, the impact of reactive limits on the index can be estimated using this relation, allowing the operator to detect limit induced bifurcation using thevenin index. The method has been implemented on a real time test bed with an OPAL-RT simulator and its online nature is demonstrated for various test systems.
Amar received the integrated Bachelors in Technology (B.Tech) in Electrical Engineering and Masters in Technology (M.Tech) in Power Systems from Indian Institute of Technology-Madras in 2011. He then worked in General Electric as an Edison Engineer for 2 years working in Trip Unit Design and Testing. He is currently pursuing the Doctoral degree under Prof. Venkataramana Ajjarapu in the Department of Electrical Engineering at Iowa State University working on the topic of the application of PMUs to assess and control voltage stability. His research interests include Synchro-Phasor Applications, Voltage Stability, Power System Modeling, Real-Time Test-Beds & Cyber Physical Systems.