A self-commutated BTB(Back-To-Back) system for the purpose of achieving power flow control and/or frequency change in transmission systems has attractive features of reliable and continuous operations even under power fault conditions. However, an overvoltage appearing across the dc link during the fault conditions should be suppressed as small as possible because it does affect the voltage ratings of power devices.This paper proposes a new control method for effectively suppressing the overvoltage under power fault conditions. This method based on a combination of feedback and feedforward controls is characterized by compensation of power flow imbalance between two power converters. The validity of both the proposed method and the developed theory is confirmed by computer simulation.
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