Frequency control in an isolated wind-diesel hybrid system with energy storage and an irrigation water supply system José Luis Monroy-Morales1 Rafael Peña-Alzola2 Rafael Sebastián-Fernández3 David Campos-Gaona2 Jerónimo Quesada Castellano4 José L. Guardado 1Electrical Engineering, TecNM/Instituto Tecnológico de Morelia, Morelia, Mexico 2Electronic and Electrical Engineering, University of Strathclyde, Glasgow, UK 3Department of Electrical, Electronic and Control Engineering, UNED, Madrid, Spain 4Electronic Technology, University of the Basque Country, Vitoria, Spain
Abstract
Wind-Diesel Hybrid Systems (WDHSs) integrate wind turbines into diesel power systems,
reducing costs and emissions in isolated grids. Due to the no-load consumption of the
Diesel Generators (DGs), fuel savings are only possible when the DGs are shut down.
This requires a proper implementation of the frequency control to avoid perturbations
because of the wind speed variations. During wind-only (WO) operation, the Synchronous
Machine (SM) generates the isolated grid voltage and the frequency controller varies the
energy stored/supplied by an Energy Storage System and consumed by the controllable
loads to balance the power. In this paper, a Battery-based Energy Storage System (BESS)
uses Li-Ion batteries with a Dual Active Bridge (DAB) and a grid-tie inverter connected to
the isolated network. The controllable load is an Irrigation Water Supply System (IWSS),
consisting of a pump supplying water to a reservoir tank. The pump is driven by a variable
speed drive that uses a Permanent Magnet Synchronous Motor (PMSM). The coordinated
control of BESS and IWSS gives full priority to the BESS for harnessing the wind potential whereas the IWSS consumes the excess of wind power. The full Wind Diesel Power
System (WDPS) is modelled and simulated to validate the proposed system for different
case scenarios.
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