Assessing Power Quality and Harmonic Levels in Distribution Systems

Abstract

Power distribution systems typically have tie and sectionalizing switches whose states determine the topological configuration of the network. The system configuration affects the efficiency with which the power supplied by the substation is transferred to the load. Power companies are interested in finding the most efficient configuration, the one which minimizes the real power loss of their three-phase distribution systems. The aim of this study is to obtain a new concept and analysis for odd harmonic current minimization which dominantly on three phases three wires power distribution system, and to design voltage phase angle shifting that has special phase angle to minimize fifth and seventh order harmonic current. The main purpose is to develop accurate models of power electronic devices that will be installed on future naval warships. These models used to analyze the harmonic distortion on the main electrical busses under a variety of operating conditions. The impact of harmonic mitigation techniques on an Integrated Propulsion System be analyzed. The study has studied the performance of various filter structures (with emphasis on IBF) have been discussed. Performance evaluation of the discussed filtering methods was presented and a detailed comparison provided. The steady-state performance characteristics at various operating points were in focus. Balanced and unbalanced utility grid with or without voltage harmonic distortion operating conditions were considered. The main power quality parameters (line current THDI and power factor, filter output voltage regulation) and energy efficiency attributes have been investigated. Concerning the transient conditions, the voltage overshoot at various locations of IBF based system was presented and the effectiveness of the appropriately selected damping resistor in suppressing the transients was shown.