MODELING AND SIMULATION OF PWM BASED STATCOM FOR REACTIVE POWER CONTROL

Abstract

This dissertation is dedicated to Modeling and Simulation of STATic synchronous COMpensator (STATCOM) for Reactive Power Control. Among Flexible AC Transmission System (FACTS) controllers, the STATCOM has shown feasibility in terms of cost effectiveness in a wide range of problem solving abilities from transmission to distribution levels. The Modular Multilevel Cascaded Converters (MMCCs) with separated Direct Current (DC) capacitors is the most feasible topology for use as a power converter in the STATCOM applications. To be able to operate in a high voltage application, a large number of DC capacitors are utilized in a MMCC based STATCOM. All DC capacitor voltages must be balanced in order to avoid overvoltage on any particular link. MMCC based on Single Delta Bridge Cells (SDBCs) to a STATCOM, particularly for reactive-power control. SDBC is categorized by cascade connection of multiple single phase H-bridge (or full bridge) converter cells per leg, hence simplifying flexible circuit design and low voltage steps. Modeling and Simulation of a 100V 5kVA Pulse Width Modulated (PWM) STATCOM based on the SDBC using MATLAB/Simulink, with focus on the operating principle and performance. Simulation results show that it can control positive sequence reactive power, negative sequence reactive power and also low frequency active power