The invention belongs to the technical field of electric vehicle charging, and particularly relates to an electric vehicle charging optimization method of a photovoltaic energy storage direct current micro-grid. Aiming at the defects that an existing charging station adopts an alternating-current power distribution network to connect each port and only an energy storage system is considered in different working modes, the invention adopts the following technical scheme: the electric vehicle charging optimization method for the photovoltaic energy storage direct-current micro-grid comprises the following steps: adopting a maximum power point tracking algorithm on a photovoltaic module to enable the photovoltaic module to output maximum power; the system is switched among the following modes: mode 1, the energy storage module discharges at the maximum power and purchases electricity from a power grid; in a second mode, the energy storage module discharges at a constant voltage lower than the maximum power, and the micro-grid operates in an off-grid mode; in a third mode, the energy storage module is charged at a constant voltage lower than the maximum power, and the micro-grid operates in an off-grid mode; and mode 4, the energy storage module stores energy at the maximum power and sells redundant electric energy. The method has the beneficial effects that the photovoltaic power generation utilization rate is improved, and the charging cost of a user is reduced.
本发明属于电动汽车充电技术领域,具体涉及一种光伏储能直流微电网的电动汽车充电优化方法。针对现有充电站采用交流配电网连接各端口且不同工作模式下仅考虑储能系统的不足,本发明采用如下技术方案:一种光伏储能直流微电网的电动汽车充电优化方法,包括:对光伏模块采取最大功率点跟踪算法使其输出最大功率;在以下模式间切换:模式一、储能模块以最大功率进行放电,从电网购电;模式二、储能模块以低于最大功率的恒压进行放电,微电网离网运行;模式三、储能模块以低于最大功率的恒压进行充电,微电网离网运行;模式四、储能模块以最大功率进行储能,将多余电能出售。本发明的有益效果是:提升光伏发电利用率,降低用户充电成本。
Electric vehicle charging optimization method of photovoltaic energy storage direct current micro-grid
一种光伏储能直流微电网的电动汽车充电优化方法
2023-03-07
Patent
Electronic Resource
Chinese
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