A Composite Strategy for Power Oscillation Damping Control Using Local and Wide Area Feedback Signals


Non-native measurements from wide space measurement systems will be used to synthesize feedback signals for FACTS or HVDC based power oscillation damping controllers. Although non-local feedback signals could have higher damping influence than native feedback signals, they involve bigger complexity and reduced robustness thanks to the possibility of partial or complete loss of Communication. A composite control strategy is proposed in this paper, that uses both local and non-local feedback channels to attain enhanced damping and improved robustness. Special local signals and their non-native equivalents are identified for series reactive and shunt real power injection devices, which facilitate the look of controllers with a easy structure and fewer parameters. Unlike modal speed signals, synthesis of these signals does not need an online eigen-solution. Case studies are presented which demonstrate the efficacy and robustness of this strategy.

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