Evaluation of Load Shedding Schemes

The existing and proposed load shedding schemes will be evaluated using the transient stability simulation, with dynamic models of generators, controllers and loads. The following factors will be considered in evaluating the load shedding schemes and providing the recommendations

• Governor/prime mover controllers will be modeled in simulation
• Spinning reserves will be modeled appropriately in the governor/prime mover model
• Frequency deviation, Rate of change of frequency deviation, Bus voltage variations as function of time will be considered
• The power balance factor will also be considered in designing and evaluating the load shedding schemes.

Load shedding is essential only during under conditions with frequency still decreasing and never to be used when frequency is recovering or increasing. This factor will be considered appropriately while designing load shedding schemes.

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