The EV DC charger belongs to the power distribution network, the communication mode and distribution automation are often considered together. Communication is one of the key and difficult points in the distribution network automation, application communication of different regions and different conditions is different, specific to the EV fast charger, the modes of communication are wired and wireless:
1.Wired communication mode
Wired Ethernet (RJ45 cable, optical fiber, industrial serial bus (RS485), RS232, CAN bus).
Wired Ethernet has the main advantage of reliable data transmission, large network capacity, and the shortcomings of the wiring is complex, poor scalability, high cost of construction, poor flexibility.
Industrial serial wire (RS485, RS232 and CAN wire) has has the advantages of reliable data transmission and simple design. The disadvantage is that the network is complex, poor scalability, high construction cost and poor flexibility, low communication capacity.
2.Wireless communication mode
Wireless mode mainly uses the mobile data access service, such as GRPS, EVDO, CDMA, etc..
The mobile data service of mobile operators need to connect electric car fast charger to mobile data network, need to pay expensive monthly fee, with the EV DC fast charger quantity increasing, the costs will be bigger and bigger. At the same time, the security of data and the reliability of the network are limited by the mobile operators, which is not conducive to the safe operation of the equipmen. Mobile operators mobile access bandwidth is shared bandwidth. When the local area has a lot of equipment access and the average bandwidth of access to its reliability and each user will worsen, is not conducive to the charging pile group intensive access, large data amount of data transmission.
