Real Time Linear State Estimation at Southern Regional Load Despatch Centre of India

Abstract

Envisaging the tools required for effective management of the future grid, Phasor Measurement Units (PMU) are being installed throughout the Indian power grid in large scale. With large scale renewable energy integration happening throughout the grid, monitoring of grid dynamics is of paramount importance. Various on-line and offline applications are being developed to utilize these high resolution time stamped PMU data. These applications will provide better situational awareness and help the system operators to mange and take decisions with much better confidence. The paper describes the formulation and implementation of Real Time Linear State Estimator which gets the real time PMU data on a moving-window basis and gives best possible estimates of the states. This paper also discusses the issues faced at Southern Regional Load Despatch Centre (SRLDC) in running custom applications that require continuous data from PMUs and it explains how a socket program was used to obtain continuous data stream in a format that can be readily used by real time network applications.