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This paper takes the chain type static synchronous compensator as the research object, introducing the principle of STATCOM, studying control strategy under the unbalanced grid voltage condition. It points out that the imbalance not only makes STATCOM output positive, negative sequence voltage, but also produces three harmonic. This article does decomposition of the current voltage sequence, and does D-Q transformation, to obtain a correct sequence network model, which works well. Through the Mat lab simulation, we prove the correctness and effectiveness of the control strategy.

Control Method of STATCOM in Unbalance Voltage Condition