Charger power control system and corresponding power control unit

Abstract

The application discloses a charger power control system and a corresponding power control unit. The charger power control system comprises a plurality of power control units. The number of the plurality of power control units is more than two; the plurality of power control units are configured to communicate with each other to form a network and each has a unique address in the network. Each ofat least parts of the plurality of power control units is used for being connected between a charger main control board and a charging gun. And each power control unit is used for adaptively adjustingthe requested charging current of the vehicle connected with the charging gun according to the change of the available capacity and load of the power supply in the network, so that the total power ofthe charger in the network does not exceed the available capacity of the power supply. According to the invention, the utilization rate of the power supply can be improved, the power utilization safety is ensured, and the expansion and supervision of the charging system are facilitated. The system is also suitable for application of bidirectional charging and discharging V2G of the electric automobile.

Description

technical field [0001] The present application relates to the field of electric vehicle charging, in particular to a charger power control system and a corresponding power control unit. Background technique [0002] The electrical system of the current charging station and pile group (hereinafter referred to as "charging system") is as follows: figure 1 As shown, the design is based on the maximum output power of the charging equipment, and then consider the redundancy of a certain capacity of the transformer or power access point to ensure that the transformer or power access point is not overloaded. However, such electrical systems have the following problems: [0003] 1) The utilization rate of the power supply is low. Since there is a possibility that all charging positions are charged by vehicles and the output power of each charging position reaches the maximum value, in order to ensure the required maximum power value and power safety, it is necessary to configure t...

AI Technical Summary

Problems solved by technology

However, the output power during the charging process changes in real time according to different vehicles, different battery states and other conditions. Generally, charging stations have multiple charging positions and charging interfaces. In most cases, the charging positions will not be charging the vehicle at the same time. The time for simultaneous charging is short, which leads to low utilization efficiency of the actual power supply, and the power input of the charging station is large (generally, the infrastructure investment on the power supply side of the charging station exceeds 30% of the overall investment);

[0004] 2) The scalability of the charging system is poor

The development of electric vehicles and power batteries is changing with each passing day, and the requirements for charging power are also getting higher and higher. For the charging stations that have been built, limited by the capacity of the power supply, it is impossible to simply replace or increase charging equipment with higher power. The service capacity of the charging station, and the expansion of the power supply will bring higher costs

The shortage of power resources, high power expansion costs, and rapid technological progress have affected the large-scale development of charging facilities;

[0005] 3) There is no energy management solution across device manufacturers

To a certain extent, this item also affects the operator's choice of equipment during station renovation and equipment upgrade;

[0006] 4) Lack of third-party supervision of the charging process

The charging process is an interactive process between the vehicle and the charging equipment. Although it is supported by the national standard, there are still many interactive problems, which may lead to abnormal charging and startup failure, or lead to safety accidents such as overcharging and fire.

Usually, when an interaction problem or accident occurs, the vehicle and the charging equipment have different opinions, and there are problems such as unclear responsibility interface and difficulty in tracing the cause of the accident.

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