Simulation of an off-board DC fast charging station for electric vehicle battery Available to Purchase

Conventional fossil fuel-driven vehicles have caused acute environmental pollution. This demands the obligation of developing automotive industries that manufacture vehicles with lower carbon footprint impact on the environment. In the light of this need, electric vehicles (EVs) appear to be the best-suited alternatives to the conventional internal combustion (IC) engine. Despite having environmental benefit, electric vehicles charging creates a negative impact on the power grid. Hence, this study focuses to achieve two specific objectives. The first objective is to design and simulate an Off-board EV charging station with two control strategies; Voltage Control (VC) and Constant Current-Constant Voltage (CCCV) charging approach. Meanwhile, the second objective is to ensure constant DC bus voltage is achieved while maintaining standard grid voltage during charging the EV battery. To achieve the mentioned objectives, the unidirectional off-board level-3 EV charger was designed and simulated in Matlab/Simulink environment. From the executed simulation, it can be concluded that the proposed off-board EV charging station for 4 EVs units has been successfully designed and developed. As outcomes, the AC grid voltage has been successfully maintained its smooth sinusoidal waveforms even at full-load conditions. So does with the AC grid current and voltage where the total harmonic distortion (THD) level for both signals is within the permissible limit under the IEEE Standard 519-2014 requirements: under 8% for the bus voltage and under 5% for the current. When the number of EV unit charged is increases up to 4 units, current total harmonic distortion also increases, in which the current THD was 9.95% therefore violated the standard of the IEEE 519-2014. However, the AC sinusoidal grid voltage can still be smoothly maintained. The DC-link voltage has also been successfully maintained at the 400V constant level. For the battery safety condition, charging can be executed as required without overheating the battery.