Analysis and Control of Low Frequency Oscillation using TCSC Small Signal Model by Control of Firing Angles

TCSC의 소신호 모형을 이용한 점호각 제어에 의한 저주파 진동 감쇠 효과 해석 및 제어

TCSC can not only increase power flow but also damp low frequency oscillation by controlling firing angles of thyristors. But, a model considering voltage, current firing angles is not derived. This paper used a small signal model considirng these variables which was derived in paper [1]. TCSC model is combined with swing equation. Being related to rotor angles and firing angles of thyristors, current and synchronizing torque coefficient is reformulated. Because firing angles of thyristors can be controlled only twice within one period, swing equation is transformed to discrete time model. It is shown that low frequency oscillation can be damped by controlling firing angles in one machine infinite bus power system.