Load control device, AC charging system and control method

Abstract

The invention relates to a load control device, an AC charging system and a control method. The load control device comprises a communication module, a changeover switch, and a control module, whereinthe communication module is used for acquiring three-phase load information of a total transformer from a background power distribution monitoring system, three input ends of the changeover switch are respectively connected with three phase power supply circuits, an output end of the changeover is connected with a power input end of a single-phase AC charging pile, the control module is used fordetermining a minimum load phase according to the three-phase load information, enabling the power input end of the single-phase AC charging pile to be connected with a power supply circuit of the minimum load phase by controlling the changeover switch and employing the power supply circuit of the minimum load phase to charge an electric vehicle when a CP handhold signal is built between the single-phase AC charging pile and the electric vehicle. Through implementing the load control device disclosed by the technical scheme, three-phase balance of a power grid is achieved on the premise that no extra high-power reactive compensation equipment is added in commercial or residential property, and the quality of the power grid is improved.

Description

technical field [0001] The invention relates to the field of automobile charging, in particular to a load control device, an AC charging system and a control method. Background technique [0002] The popularity of electric vehicles has become a trend, and charging stations for charging electric vehicles include independent charging stations and charging stations installed in residential areas. For charging stations set up in residential quarters, each AC charging pile is generally connected to single-phase AC power. Due to the random characteristics of electric vehicle charging loads, it brings a lot of uncertainty to the operation of the distribution network. Three-phase unbalance. In addition, considering that charging facilities are not planned in the early stage of commercial and residential areas, and in order to cope with the development of electric vehicles, AC charging piles with smaller power and volume will be generally added in the later stage to meet the demand,...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problem of increasing the three-phase unbalance degree of the power grid existing in the prior art, the present invention provides a load control device, an AC charging system and a control method, which can realize the three-phase balance of the power grid and improve the quality of the power grid

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