Electric vehicle intelligent alternating current charging system

Abstract

The invention discloses an electric vehicle intelligent alternating current charging system, which comprises a power acquisition device and a control device, the power acquisition device is arranged at an input terminal of a public supply network, and the input terminal of the public supply network is a three-phase four-wire system; electricity users of thepublic supply network include one or moreexternal alternating current charging piles; the power acquisition device is connected with the control device, used for power acquisition ofthree phases and a zero line of the public supply networkto determine the load condition of each phase and sending the load conditions to the control device; and the control device is used for generating control signals according to the load conditions andsending the control signals to the external alternating current charging piles, so as to control the external alternating current charging piles to operate from the phase line with heavy load to the phase line with light load. According to the technical scheme, on the basis of giving priority to residential electricity consumption and production electricity consumption, the rest available electricity is dynamically distributed to the charging piles, power resources are fully utilized, and obstacles are cleared for the charging piles entering communities.

Description

technical field [0001] Embodiments of the present invention relate to the field of electric power technology, and in particular to an intelligent AC charging system for electric vehicles. Background technique [0002] At present, electric vehicles have been widely developed. For the convenience of charging, electric vehicles are equipped with AC charging ports and DC charging ports. Correspondingly, there are AC charging piles and DC charging piles. DC charging piles charge faster, but are more expensive, and are more suitable for public charging occasions; while AC charging piles are slower in charging speed, but cheaper, and are more suitable for residential parking lots or Parking lots in industrial parks, because cars park in these parking lots for a longer period of time. [0003] However, in the residential districts or industrial parks that were built earlier, the power supply capacity of the power grid was only designed to meet the residential electricity consumptio...

AI Technical Summary

Problems solved by technology

For example, in a residential area, after the car owner drives home at night, he will insert the charging gun into the electric vehicle immediately, and the charging pile will start charging the electric vehicle. Increase the power load of the community, resulting in a decrease in the grid voltage, and even cause the overload protection of the power distribution facilities of the community to interrupt the power supply of the community

In order to avoid such phenomena, community properties generally do not allow the construction of a large number of charging piles, or limit the charging time of community owners for electric vehicles.

This will bring a lot of inconvenience to the promotion and use of electric vehicles

[0004] On the other hand, the current domestic electricity consumption in the community is basically a single-phase load. Since the load connected to each phase is uncertain, the power consumption time is also uncertain, and there may be loads connected to or connected to each phase at any time. Disconnection, which will lead to unbalanced three-phase load, resulting in low voltage of overloaded phase and increase of neutral current

[0005] The current AC charging pile is also a single-phase load. If the charging pile is connected to a phase line with a heavy load, even if the other two-phase loads are leftover, the charging pile cannot be used.

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