DC Microgrid for Wind and Solar Power Integration

TitleDC Microgrid for Wind and Solar Power Integration
Publication TypeJournal Article
Year of Publication2014
AuthorsStrunz K, Abbasi E, Huu DNguyen
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Date Publishedmar
KeywordsBatteries, day-ahead scheduling, dc microgrid, distributed energy resources, distributed power generation, Droop control, droop curves, electric vehicle (EV), electric vehicles, emission constraint, fast charging, high-rise host building, Microgrid, Microgrids, multilevel energy storage, operational controls, optimal scheduling, Optimization, power electronic conversion, power electronic converters, power generation control, power generation scheduling, Predictive models, real-time scheduling, renewable solar power generation, renewable wind power generation, Solar Power, solar power stations, storage state-of-charge, untapped solar power, untapped wind power, urban area, Wind forecasting, wind power, wind power generation, wind power plants, wind-solar power integration
AbstractOperational controls are designed to support the integration of wind and solar power within microgrids. An aggregated model of renewable wind and solar power generation forecast is proposed to support the quantification of the operational reserve for day-ahead and real-time scheduling. Then, a droop control for power electronic converters connected to battery storage is developed and tested. Compared with the existing droop controls, it is distinguished in that the droop curves are set as a function of the storage state-of-charge (SOC) and can become asymmetric. The adaptation of the slopes ensures that the power output supports the terminal voltage while at the same keeping the SOC within a target range of desired operational reserve. This is shown to maintain the equilibrium of the microgrid's real-time supply and demand. The controls are implemented for the special case of a dc microgrid that is vertically integrated within a high-rise host building of an urban area. Previously untapped wind and solar power are harvested on the roof and sides of a tower, thereby supporting delivery to electric vehicles on the ground. The microgrid vertically integrates with the host building without creating a large footprint.