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The paper addresses a novel scheme for the control of variable wind energy and energy storage plant such that the generation and energy storage can deliver a smooth and constant power as demanded by the grid load. In addition, the wind energy generators are assumed large compared to the local grid rating and will contribute to the voltage and frequency regulation of a grid using adaptive frequency and voltage droops. The scheme is appropriate for wind turbines or other variable renewable supplies feeding stand-alone grids, micro-grids, local area grids, or feeder busses for offshore wind farms. The paper describes the control philosophy and the communicative strategy between the generators, energy storage, dispatchable load and auxiliary generators or power feeds. Simulation results using the PSCAD program are given that illustrate the smooth, constant and responsive nature of the power delivery. The ratings of the energy storage and dispatchable loads are discussed with supporting results.
Date of Conference: 6-8 Sept. 2010