Optimal Placement of Dstatcom and Load Flow Analysis of Radial Distribution Networks

Abstract

This paper presents the modeling of shunt Distribution FACT device in load flow analysis for the steady state voltage compensation and loss minimizations. For this purpose, Distribution STATCOM (D-STATCOM) is considered as shunt compensator. An accurate model for this device is derived to use in load flow analysis. The rating of this device as well as direction of reactive power injection required to compensate voltage to the desired value (1 p.u) are derived and discussed analytically and mathematically using phasor diagrams. Since performance of D-STATCOM varies when it reach to the maximum capacity, modeling of this compensator in the maximum rating of reactive power injection are derived and discussed. The validity of proposed model for fixed compensation and compensation for fixed voltage is examined using MATLAB coding for two IEEE standard distribution systems consisting of 33 and 69 nodes respectively. The best location of D-STATCOM using Rate of under Voltage Mitigation node (RUVMN) in the distribution network is determined.