Flexible reuse type optical storage charging intelligent charging station based on high-voltage direct-current microgrid

Abstract

The invention provides a flexible reuse type optical storage charging intelligent charging station based on a high-voltage direct-current microgrid. The system comprises a bidirectional rectification unit, a bidirectional charging pile unit, a switching unit, a charging gun, a photovoltaic power generation unit and an energy storage unit. The bidirectional rectification unit is connected with a 10kV AC power distribution network upwards, and converges with the bidirectional charging pile unit downwards at a 1kV DC bus. The switching unit is connected with the indoor machine room bidirectional charging pile unit, the energy storage unit, the outdoor charging guns and the photovoltaic power generation unit at the same time. Different direct-current charging and discharging channels are established by using a contactor fling-cut switch matrix, and different control strategies are adopted according to the charging power of the electric vehicle, so that the flexible charging of the electric vehicle can be realized; the power utilization of the fast charging station in the daytime load peak period is supported, and a photovoltaic power generation system is added for supplementation, so that the load peak-valley difference of the fast charging station can be effectively balanced, the peak clipping and valley filling effects are achieved, the stable operation of the power grid operation state is maintained, and the system operation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of new energy photovoltaic energy storage charging stations, in particular to a flexible and reusable optical storage charging smart charging station and a control method based on a high-voltage DC microgrid. Background technique [0002] At present, the electric vehicle charging station has a single power supply, mainly in the form of power supply through the distribution network. There are usually multiple DC chargers in the station. Due to the high power of a single DC charger, the single charging time is short. During the peak load period of the power grid, if a large number of electric vehicles need fast charging at the same time, the high-power charging demand will bring a short-term load impact on the power grid. With the large-scale construction of charging stations, this problem will inevitably affect the stable operation of the power grid, and may even threaten the security of the power system. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible and reusable optical-storage-charge smart charging station based on high-voltage DC micro-grid, which solves the problem of short-term load impact on the power grid during peak load periods in the prior art

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