An adaptive IIR notch filter based Half-Cycle P-Class phasor measurement estimation scheme

Abstract

This paper presents a simple yet effective phasor estimation scheme, which is compliant with the protection class performance of Phasor Measurement Units (PMUs). The proposed scheme is comprised of three main steps, viz., i) realtime frequency estimation using Goertzel-Zero Crossing Detector (G-ZCD), ii) reference signal generation, and iii) fourth order Adaptive IIR Notch Filter (ANF) based phasor estimation. The proposed estimator accurately estimates the signal phasors within half a cycle of the power system frequency, and hence is suitable for P-Class PMUs development. The effectiveness of the proposed scheme is checked on different test scenarios, as per the IEEE C37.118.1a-2014 standards, confirming the potentiality of the proposed estimator to detect the possible presence of static and dynamic conditions in the signal. The validation of proposed algorithm with Real Time Digital Simulation (RTDS) data for the fault scenario in the IEEE 13 node distribution feeder integrated with Photo Voltaic (PV), is also presented.