This study investigates the subsynchronous resonance (SSR) characteristics in the systems with doubly-fed induction generators and series compensated ac lines, by using the transfer-function analysis approach. A new SSR mitigation method by a proper control of a series capacitor (SC) is also presented with the effectiveness evaluated. SSR mitigation by a proper control of the SC is attractive since it does not incur any additional cost. This shows that there are no technical obstacles to use a series compensation as a means to improve the power transmission capability in the systems with a high wind energy penetration.
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