The electric vehicle charging pile belongs to the distribution network side, and its communication mode is often considered together with the distribution network automation. Communication is a key and difficult point of distribution network automation. Different regions and conditions can apply different communication methods. For electric vehicle charging piles, their communication methods mainly include wired mode and wireless mode:
(1) Wired mode
Wired modes mainly include: wired Ethernet (RJ45 cable, optical fiber), industrial serial bus (RS485, RS232, CAN bus).
The main advantages of wired Ethernet are reliable data transmission and large network capacity, while the disadvantages are complex wiring, poor scalability, high construction cost and poor flexibility.
The advantages of industrial serial bus (RS485, RS232, CAN bus) are reliable data transmission and simple design, while the disadvantages are complex network layout, poor scalability, high construction cost, poor flexibility and low communication capacity.
(2) Wireless mode
The wireless mode mainly adopts the mobile data access services of mobile operators, such as GRPS, EVDO, CDMA, etc.
The adoption of mobile data business of mobile operators requires the electric vehicle charging pile, which is an internal equipment of the power grid, to be connected to the mobile data network of mobile operators, and requires the payment of expensive monthly rent and annual fees. With the increase of the number of charging piles, the cost will become larger and larger; At the same time, data security and network reliability are limited by mobile operators, which is not conducive to the safe operation of equipment; Secondly, the mobile access bandwidth of mobile operators belongs to shared bandwidth. When a large number of devices are accessed in a local area, the access reliability and the average bandwidth of each user will deteriorate, which is not conducive to the intensive access of charging piles and the transmission of large amounts of data.
