Reader's guide to subsynchronous resonance

Many utilities are either applying or considering applying series capacitors because of the economic advantage. But the hazards to turbine-generators require that utility engineers fully understand and thoroughly analyze the effects of subsynchronous resonance (SSR) caused by series capacitors. To help in the understanding and analysis of SSR, the authors consolidate and review the key issues. Discussions include basic theory, problem identification, testing and countermeasures. A list of references is provided. Brief descriptions are given of related problems not caused by series capacitors. These problems, referred to as device-dependent subsynchronous oscillations, result from the interaction of a turbine-generator with fast acting controllers of power system components.<>