A PMU-based distribution system harmonic state estimation using parallel processing

This paper presents a novel approach for harmonic state estimation for a real-time power quality management in distribution networks using Phasor Measurement Units (PMUs). In the developed methodology, the PMUs measure voltages and currents signals with harmonic distortion in those buses which are continuously monitored by these meters. Load historical data are considered for the non-monitored buses. They are treated as bounded inequality constraints with predefined upper/lower limits in a proposed constrained non-linear optimization problem. A modified IEEE 33-bus test system is used to validate the proposed methodology and the use of parallel processing is discussed for the real-time applications in harmonic monitoring.