Alternating-current charging pile three-phase balancing method and system

Abstract

The invention relates to an alternating current charging pile three-phase balance method and system. The method comprises the following steps: periodically calling a current effective value, collectedby each charging pile in a charging pile network in real time, of a current connected phase sequence; according to the current effective value of the current connected phase sequence of each chargingpile and the current charging pile network environment, performing split-phase calculation on the three-phase phase sequence of each charging pile based on a preset algorithm to obtain the three-phase unbalance degree of the charging pile network; judging whether balance switching needs to be executed or not according to the three-phase unbalance degree of each charging pile and the national standard or other standard requirements; if balance switching needs to be executed, selecting a corresponding balance switching scheme based on a balance algorithm to guarantee that the balance switchingscheme is optimal; and issuing a phase sequence switching instruction to the charging pile needing to be switched according to the selected balance switching scheme, and enabling the charging pile toexecute switching according to the instruction. Due to the fact that the charging piles in the charging pile network are subjected to dynamic balance periodically, the charging piles in the charging pile network can keep three-phase balance all the time under the execution of the dynamic balance strategy.

Description

technical field [0001] The present application relates to the technical field of three-phase balance of AC charging piles, in particular to a method and system for three-phase balancing of AC charging piles. Background technique [0002] As the country proposes to focus on infrastructure construction at the technological end, new energy vehicle charging piles have become a new infrastructure industry that the country attaches great importance to, and have been included in the seven "new infrastructure" sectors. AC charging piles are widely used due to low construction cost, low per kilometer / unit price, low damage to batteries, easy installation, and no need for special expansion and distribution network. The needs and dependence of the society are also becoming more and more serious. However, the use of a large number of car charging piles will cause serious unbalanced three-phase power supply loads. In the prior art, load balance is generally considered, but because car c...

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Problems solved by technology

However, the use of a large number of car charging piles will cause serious unbalanced three-phase power supply loads. In the prior art, load balance is generally considered, but because car charging power is a dynamic power consumption device, the uncertainty caused by it , often make many methods of distributing three-phase loads according to prior estimates unable to guarantee the requirements of the above standards for unbalance

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