Multifunctional charging pile system based on DC (direct-current) solid-state transformer

Abstract

The invention discloses a multifunctional charging pile system based on a DC (direct-current) solid-state transformer. The system comprises a photovoltaic array, an intelligent convergence box, a storage battery, the DC solid-state transformer, a controller, a low-voltage DC / DC converter, multiple charging guns and multiple charging interfaces, wherein the photovoltaic array is connected with theintelligent convergence box; the DC solid-state transformer is connected with the intelligent convergence box, the storage battery, the multiple charging guns and the low-voltage DC / DC converter, andthe low-voltage DC / DC converter is connected with the multiple charging interfaces; the control device is used for controlling the storage battery, the DC solid-state transformer and the low-voltage DC / DC converter. The system is not required to be powered by an AC network, and source-charge distance can be effectively reduced, so that energy loss and harmonic distortion caused by repeated AC andDC conversion are avoided; meanwhile, the charging guns and the charging interfaces share a booster circuit and an inverter circuit of the DC solid-state transformer, therefore, size and cost of the charging pile system can be remarkably reduced, and utilization rate of equipment is increased.

Description

technical field [0001] The invention relates to a charging pile circuit, in particular to a multifunctional charging pile system based on a DC solid-state transformer. Background technique [0002] With the increase in the number of electric vehicles, large-scale charging is inevitable, which will bring challenges to the safe and economical operation of the power system. In most cases at this stage, electric vehicles use the AC power supply to charge the battery through the on-board rectifier or the rectifier device of the charging pile. Both of these methods convert the AC power into DC power and then charge the battery, resulting in a large power loss. and harmonic distortion. [0003] In addition, as the transfer station of energy flow between the distribution network, new energy micro-grid and users, the energy coordination management of the charging pile is very important. The realization of accurate power coordination requires a reliable "energy router". ". Since th...

AI Technical Summary

Problems solved by technology

At present, the application scheme of using solid-state transformers as AC-DC micro-grid energy transfer mainly focuses on system structure design, mathematical modeling and simulation, configuration of energy storage equipment, etc., but there is no DC solid-state transformer circuit for charging piles at present, so it is impossible Reduce power loss and harmonic distortion due to AC-DC conversion

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