Multi-power stage parallel fast charging system and method

Abstract

The invention discloses a multi-power-section parallel-connection rapid charging system and method. On the basis of an existing charging device, a few simple power electronic devices are added, so that the direct current side power of charging piles is flexibly exchanged among the multiple charging piles. When one single charging pile can meet the charging power requirement, the single charging pile is used for supplying electricity. When one single charging pile can not meet the charging power requirement, a charging station control center reasonably arranges the parallel-connection electricity supplying mode of the charging piles according to the current idle conditions of the charging piles, so that the purpose of meeting the charging power requirement is realized. According to the charging technology, different parallel-connection electricity supplying modes of the charging piles are arranged according to different charging power requirements, so that the rapid charging requirement of users is met, the charging capacity of a whole power station can be used as much as possible, and the operation profit of the charging station is increased.

Description

technical field [0001] The invention relates to a multi-power section parallel fast charging system and method. Background technique [0002] In recent years, with the development of electric vehicle (Electric Vehicle) and plug-in hybrid electric vehicle (Plug-inHybrid Electric Vehicle) technology, electric vehicles will gradually replace traditional cars as an important means of transportation for people to travel. The charging technology of electric vehicles has received more and more attention, and a variety of effective charging structures and charging methods have been proposed in academia and industry. According to the location of the charging device, it can be divided into on-board charging device and off-board charging device, and the on-board charging device can be divided into charging device with conductive line and charging device without conductive line. According to the existing power level, it can be divided into level 1, level 2 and level 3. Level 1 chargin...

AI Technical Summary

Problems solved by technology

Level 3 DC charging piles are mostly AC-DC power electronic devices with large volume and high equipment cost

[0003] There may be multiple charging piles in a DC charging station. Because the charging time of the car is different, at some point, only a few charging piles may be working, and the redundant charging piles cannot play a role. Considering the high price of charging piles, charging piles Idle will reduce charging station revenue

like figure 1 As shown, in the current situation, when the number of electric vehicles is less than the number of charging piles, each electric vehicle still has a charging pile for power supply, and the charging time is still very long, which affects people's experience of using electric vehicles

And with the continuous development of electric vehicles, not only more and more electric cars will appear, but also a large number of other forms of electric vehicles, such as electric buses, electric trucks, etc. Different types of electric vehicles have different charging power requirements. Charging piles with low power cannot meet the needs of high-power electric vehicles. Although charging piles with high power can meet the requirements of all electric vehicles, they will increase the cost of charging piles

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