Electric Energy Grid Models

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Direct the development of models that closely reflect the recovery of the electric energy grid after three phase faults are cleared. Background: Transmission system operators use load flow models to understand voltage variations, transformer loading, and transmission line loading. Protection engineers use short circuit models to develop protective relay settings and to analyze protective relay operations. Technical advisors use transient stability models to predict recovery after faults are cleared at critical locations and when electric energy is restored to neighborhoods after prolonged outages. These three models need to be updated to include air conditioners, distributed generation, and other components that are not accurately represented in current models. Note: Prescient proposes to work with the providers of National Grid’s electric energy system models to create one database with three purposes. 1. Short circuit model 2. Load flow model 3. Recovery model The proposed model will include the following additions to the existing models: • All distributed energy sources larger than 50 KW • Equivalent energy sources when multiple distributed energy sources in a small geographic, electrically connected, area simultaneously respond to voltage perturbations. • All motors 50 horsepower or larger including mechanical load features. • Equivalent motor representations when multiple smaller motors in a small geographic, electrically connected, area simultaneously respond to voltage perturbations. • Ambient temperature biased load models. • Voltage thresholds in short circuit models that change component representations in recovery models.