- Amirkabir University of Technology
The microgrids (MGs) are composed of several Distributed Generation (DG) units, storages and loads at the demand side which can work in both islanded and connected to the main grid; in islanded mode, the MGs voltage and frequency must be controlled by individual DG units. As the Plug-in Hybrid Electric Vehicles (PHEVs) in MGs can have both roles of loads and storages, participation of these ever growing elements in the MGs voltage and frequency control problem is investigated in this study. At first, an intelligent droop control for MGs voltage and frequency control is proposed to be implemented on inverter-interfaced DGs except PHEVs. The proposed droop control is independent from the MG lines parameters and can control the voltage and frequency of MG seamlessly. Afterwards, a novel strategy for participating the PHEVs in controlling the voltage and frequency of MGs is proposed. This strategy is implemented on the PHEVs parking lots in the Vehicle-to-grid (V2G) mode. This strategy has a prominent capability to keep the stability of MG even in severe scenarios compared to the other previous strategy. Moreover, the proposed strategy lowers the voltage drops and keeps the frequency constant. In the simulation studies, both proposed (named smart) and previous (named non-smart) charging strategies are implemented and compared. The simulation results show the effectiveness of the proposed strategy in order to keep the stability of MG even in severe scenarios, maintain the frequency and voltage better than another recent strategy.
- Microgrid, MG, Plug in hybrid electric vehicles, PHEV, Voltage control, Frequency control, Intelligent droop control, Smart charging strategy