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This paper presents the control of distribution static synchronous compensator (DSTATCOM) for reactive power, harmonics and unbalanced load current compensation of an diesel generator system.The aim of the electric generating system is to generate electrical energy and to deliver this energy to the end user equipment at an acceptable voltage. One of the most common power quality problems is voltage sag. Voltage sag is a reduction in the RMS voltage in the range of 0.1 to 0.9p.u for duration greater less than one minute. There are different ways to mitigate voltage sag, swell and interruptions in distribution system. There are different types of FACTS controllers used for improvement of power quality. These devices are connected either in shunt or in series or in combination of both. The series connected device is DVR(Dynamic voltage restorer) which is used to inject a voltage of desired amplitude, frequency and phase between point of common coupling (PCC) and the load in series with the grid voltage. The shunt-connected device is the DSTATCOM which is used to dynamically inject a current of desired amplitude, frequency and phase into the grid. Nowadays, there are an increasing number of non-linear loads which inject harmonics into the system. A three-phase insulated gate bipolar transistor (IGBT) based current controlled voltage source converter(VSC) with a DC bus capacitor known as a DSTATCOM is used for power factor correction, harmonic compensation and for providing required reactive power to the load. A model of DSTATCOM connected to diesel generator based isolated generation system feeding linear and non-linear loads (diode bridge rectifier with R and R-C) is developed for predicting the behavior of system under transient conditions. Simulation is carried out in standard MATLAB environment using Simulink and power system blockset toolboxes. Finally the performance of DSTATCOM under various fault conditions is investigated.

Keywords

Diesel Generator Set, D-STATCOM, Voltage Source Converter (VSC), Harmonic Elimination, Load Compensation

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