Grid Inertia Monitoring Using Wide Area Measurements

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Name of the Speaker: Ms. Lavanya.L (EE18D414)
Guide: Dr. Swarup K S
Venue: ESB-244 (Seminar Hall)
Date/Time: 19th January 2023 (Thursday ), 2:30 PM

Modern electrical power systems are migrating towards renewable energy, which is fraught with difficulties. The grid's diminishing inertia is one of the key challenges to the grid’s transition towards renewable energy sources.Grid Inertia (GI) is a measure of total kinetic energy available in the grid that balances the supply mismatch immediately after a disturbance. It represents the grid's inherent ability to withstand power imbalances. A significant amount of inertia was provided by traditional power plants, which are being replaced by renewable sources with low or no inertia. With reduced inertia, the stability of the power system is affected, increasing the probability of grid outages. Therefore, it is crucial for the grid operators to monitor grid inertia for a secured, stable and economic operation of the grid.

In this seminar talk, a novel method to estimate regional inertia of a power system from switching events such as connection or disconnection of generators or loads is presented. The method uses Synchronous Phasor Measurement Units (PMUs) installed at the generators or tie-lines of the region. In the event of detection of frequency events, like i.e., power imbalance, a system of linear equations is formulated and solved to obtain the inertia. The performance of the method is demonstrated using Kundur Two-Area and IEEE-39 bus test systems. In addition, the effect of loads’ response that resembles inertia due to voltage and frequency dependence is examined. An analysis is carried out to study how the inertia-like response of loads varies with respect to various system parameters.