Advanced series compensation for transmission systems using a thyristor switched capacitor module
Recent studies have shown that variable series compensation can be used as an effective method to improve stability and power flow control in modern power systems. To achieve this variable series compensation, small blocks or modules of capacitive reactance are cascaded and switched independently by thyristor pairs to achieve the required degree of compensation. The use of solid state switching provides increased speed, flexibility and reliability over the mechanically switched capacitors that have been previously considered. The specifications for the compensator require realizable and cost effective equipment which meets the technical requirements. Nonlinear simulations in the form of Electro-Magnetic Transients Program (EMTP) studies are used to verify that the design meets these requirements. In addition to the compensator design which is unique to this application, insight is provided into the criteria that must be considered when designing similar equipment for other applications. A method is also proposed to solve the problem of subsynchronous resonance (SSR). This method is based on the combination of static filters and thyristor switching, and is shown to be successful in controlling all SSR modes of the generator at any level of compensation. Finally, a controller is developed for the compensator and by allowing variation in the level of compensation over a wide range, is shown to be effective in damping low frequency oscillations in the system.
- Research Organization:
- Clarkson Univ., Potsdam, NY (United States)
- OSTI ID:
- 5064772
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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