Stability Evaluation of the Reference Standard PMU at CSIR-NPL

Abstract

AbstractPhasor measurement units (PMU) has becoming an emerging and promising technology in monitoring the safety and security of the power grids. Synchro phasor measurements using PMU facilitate dynamic real-time measurements round the clock that will help in realization of smart grid. As PMUs are increasingly being deployed in power grids, it is critical that their results must be traceable, reliable, and accurate. Recently, established PMU calibration system traceable to the primary standards of CSIR-NPL is used to carry out comprehensive PMU calibration as per IEEE Std. C37.118.1a-2014. In this paper, a reference standard PMU, which is being calibrated using PMU calibration system, has been studied for its stability over the period of time that is significant for analyzing reference standard PMU performance. Reference standard PMU has been calibrated for M class at 50 frame rate. Static and dynamic tests were performed at particular voltage and current level to study the stability. Measured parameters are defined in terms of total vector error (TVE), frequency error (FE), and rate of change of frequency error (ROCOF). As per IEEE protocol, acceptable limit defined for TVE is 1.00%. The CSIR-NPL reference standard PMU has maximum estimated TVE of 0.6%. The measured result shows that reference standard PMU has very good stability and measurements taken so far is well within the acceptable IEEE limits.KeywordsSteady stateStabilityPhasor measurement unitPMU calibration systemTraceability