Load curtailment on isolated power systems

Buglar, Ernest T. (Ernest Thomas) (2009) Load curtailment on isolated power systems. Masters thesis, Memorial University of Newfoundland.

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Abstract

This thesis concerns the design and application of load curtailment schemes to isolated power systems. Load curtailment or loadshedding is a methodology employed to relieve a power system of a severe overload and restore nominal system operation through reduction of total system load. An overload on a power system may be detrimental to the continued stability of the system especially during operation with inadequate reserves. The PSS/E software package is utilized to simulate the system voltages and frequency during underfrequency and undervoltage events. -- The general loadshedding methodology developed is to shed increasing amounts of load from the power system in response to increasingly severe contingencies. These contingencies, such as the loss of a major transmission line or generator, may negatively impact the frequency and voltage stability of the power system and load curtailment is presented as an effective mitigating action. The developed methodology is first applied to a simple test system to demonstrate the necessity and effectiveness of loadshedding as a remedial action following extreme operating contingencies. Subsequently, the methodology is applied to the interconnected system of the island of Newfoundland. This system operates at a maximum transmission voltage of 230 kV and has approximately 8500 MJ of connected inertia at peak operating capacity.

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