Charging pile charging and discharging control method and charging and discharging system

Abstract

The invention relates to a charging and discharging control method of a charging pile and a charging and discharging system. The method includes: detecting the charging demand of an electric vehicle; if the electric vehicle has a charging demand, detecting the state of charge of an energy storage power supply; If it is greater than the set power threshold, the energy storage power supply will output power to the electric vehicle to charge the electric vehicle; if the power state of the energy storage power supply is not greater than the set power threshold, the power grid will output the power to the electric vehicle to charge the electric vehicle; If the electric vehicle has no charging demand, the electric energy flow between the power grid and the energy storage power source is controlled accordingly according to whether the power grid is in the peak power period. In the present invention, when the electric vehicle needs to be charged, the energy storage power source is preferentially used to charge the electric vehicle. Only when the power of the energy storage power source is insufficient, the electric vehicle is charged by the power grid, and the electric vehicle charging demand is guaranteed. Under the circumstance, the utilization rate of energy storage power is effectively improved.

Description

technical field [0001] The invention relates to a charging and discharging control method and a charging and discharging system of a charging pile, belonging to the fields of power electronics technology and energy storage technology. Background technique [0002] In recent years, with the increasing attention to energy shortage and environmental issues worldwide, the development of electric vehicles has become a hot spot, and the development of my country's electric vehicle industry is in a good situation. The development of electric vehicles is bound to be inseparable from the construction of charging infrastructure. Fast charging is a method to solve the battery life problem of electric vehicles, and it is the direction of vigorous development in the future, but fast charging load will affect the power quality and safe and stable operation of the grid. [0003] In some areas, due to the increasing investment and construction of charging piles, most charging piles have be...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a charging pile charging and discharging control method and a charging and discharging system to solve the problem of low utilization rate of energy storage power supply

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