Fuzzy Logic-based Charging Strategy for Frequency Control of an Electric Vehicles-Integrated Weak Grid

In this paper, a Fuzzy logic-based charging strategy is proposed for electric vehicles (EVs) to provide a stable frequency response for a weak grid (WG)-microgrid. Along with the frequency control, another fuzzy charging method is designed for EV to increase the revenue for the EV charging station owner. Both strategies have the same output which is the normalized EV power. Moreover, the state of charge (SOC) of EV, PV power, price, and the WG frequency error are regarded as the inputs of the fuzzy-based charging strategies, however, the price and the WG frequency error don’t matter to the frequency control and the revenue growth, respectively. In return, a one-degree change method is introduced to modify the frequency control rules for obtaining more revenue while the less power is needed for the frequency error compensation. Simulation results in MATLAB/Simulink environment are presented to assay the proposed charging strategies in various operating conditions and verify their abilities.