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Design and Implementation of Dstatcom Topology with Three Phase Multi Level Inverter for Load Compensation with Nonstiff Source

S Kavin Joseph, P.Rajakumar

This project presents a transformer less Distribution static synchronous compensator (DSTATCOM) system based on hybrid multilevel Hbridge converter with delta configuration. This hybrid multilevel DSTATCOM is characterized by per-phase series connection of a high-voltage H-bridge converter operating at fundamental frequency and a low-voltage H-bridge converter operating at 5 kHz without any other circuit for dc voltage control. A new control strategy is proposed in this project with focus on dc voltage regulation. Clustered balancing control is realized by injecting a zero-sequence current to the delta-loop, while individual voltage control is achieved by adjusting the fundamental content of ac quasisquare- waveform voltage of high-voltage converter. Index Terms—Multilevel inverter, Carrier Based PWM.