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21
2025
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03
Solar photovoltaic energy storage system model
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The energy storage system configured on the AC side of the power supply can also be called the energy storage system configured on the AC side，Cell type AC side of the energy storage mode，Separate charge and discharge controllers and inverters are used to charge or invert the battery。
This solution is actually to attach an energy storage device to the existing photovoltaic power generation system，It can be upgraded and installed in any kind of photovoltaic power station or even wind power station or other power station to form an in-station energy storage system。It can also be built into a completely independent energy storage power station according to the needs of the grid。
This mode overcomes the problem that the DC side energy storage system cannot uniformly dispatch excess power。Its system charging or discharging is completely controlled by the intelligent control system or by the power grid dispatching control，It can not only concentrate the excess power in the whole station to charge the energy storage system quickly and effectively，It can even dispatch the cheap off-peak excess power of the grid outside the station, making the system operation more convenient and efficient。The energy storage system configured on the DC side of the power supply can be mainly installed in the DC system such as photovoltaic power generation，In this design, the battery combination photovoltaic power generation array can be connected and controlled in the DC section of the inverter, and the photovoltaic power generation system and the battery energy storage system share one inverter。
However, due to the charging and discharging characteristics of the battery and the output characteristics of the photovoltaic power generation array are very different，The maximum power tracking system (MPPT) in the grid-connected PV inverter in the original system is specially designed to match the photovoltaic output characteristics，The output characteristic curve of the storage battery cannot be met at the same time. It is not only necessary to make the inverter meet the inverter requirements of the photovoltaic array, but also to increase the charge and discharge controller of the battery pack, and battery energy management and other functions. In general, the system is one-way output, that is, the battery in the system is fully charged by photovoltaic power generation, and the power grid cannot charge the battery。
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