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Electric Vehicles and the Power Grid
Published in Iqbal Husain, Electric and Hybrid Vehicles, 2021
Alternatively, a DC distribution system can be envisioned which is established centrally by converting the MVAC to a lower user-level DC voltage. This central conversion can be accomplished either with a step-down 60âHz low-frequency transformer coupled with a single AC/DC power electronic converter or through the use of an SST. The DC distribution line delivers power to individual DC fast charger units that has an internal DC/DC converter. The two types of DC-coupled EV fast charging stations are shown in Figure 12.6a and b. The DC distribution system eliminates multiple AC/DC and DC/DC conversion stages, and facilitates energy storage and other renewable generation integration which output DC power such as solar PV systems. In contrast, an AC-connected system is more complicated to control than DC-connected systems since they need to deal with inverter synchronization, and voltage and frequency regulation during islanded operation of the system. In AC- and DC-coupled charging stations, the system benefits from load diversification by sharing a large common power supply to serve varying PEV battery capacities with different SOC conditions. The system power demand can be substantially lowered from the rated value by adjusting the charging profile based on the battery requirement.
Research on the classic power supply modes of AC/DC distribution network
Published in Journal of International Council on Electrical Engineering, 2018
Shigong Jiang, Weihong Yang, Yunfei Wang, Hongjun Li
In industrial park, the main DC loads includes converters, electrolytic furnaces, precise electronic instruments, central air conditioning, elevators, the proportion of DC load is more than 40%. Also, renewable energy generation systems are involved. So, the power supply capacity, reliability and power quality are highly rigorous. With the same power line corridor, DC distribution system can achieve bigger transmission capacity and be convenient for renewable energy accessing.Remoulding of load center in cities