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Title: A Novel DC Voltage Control System for D -STATOM on Hybrid Convertor using Renewable Energy Source

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Title:
A Novel DC Voltage Control System for D -STATOM on Hybrid Convertor using Renewable Energy Source
Author Name:
Divesh Thareja, Vijay Kumar
Abstract:
This thesis presents a transformless static synchronous compensator (D-STATCOM) system based on hybrid multilevel D-STATCOM which 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 thesis which focuses 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 quasi-square-waveform voltage of high-voltage converter. The hybrid multilevel D-STATCOM performs satisfactory not only improving efficiency and waveform quality , but also compensating reactive power and negative-sequence current while maintaining DC voltage at the given value.
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