Energy storage and photovoltaic alternating current coupling power supply system

Abstract

The embodiment of the invention discloses an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a mains supply power grid. The system comprises an energy storage module used for charging or discharging an energy storage battery; a photovoltaic module which is in alternating-current coupling connection with the energy storage module and used for providing solar power generation; and a control module which is connected with the energy storage module and the photovoltaic module and is used for selectively controlling theenergy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy. According to the energy storage and photovoltaic alternating-currentcoupling power supply system provided by the embodiment of the invention, the energy storage module and the photovoltaic module are in alternating-current coupling connection, so the problems of buttjoint and compatibility of different types of energy storage inverters and photovoltaic inverters in the prior art are solved, and the output voltage stability of the energy storage inverters and thephotovoltaic inverters is ensured.

Description

technical field [0001] Embodiments of the present invention relate to energy storage technology, and in particular to an AC coupled power supply system of energy storage and photovoltaics. Background technique [0002] In recent years, with the development of new energy sources, photovoltaic systems have increasingly entered household use scenarios. Especially in areas with good sunlight, photovoltaic power generation has brought tangible benefits to people. However, photovoltaics can generate electricity during the day, and when the sun goes down, they cannot continue to generate electricity and use solar energy. At the same time, with the development of household energy storage systems, this problem has been solved. The household energy storage system can cooperate with the photovoltaic system. During the day, the battery is charged through the energy storage inverter to store the excess solar energy. At night, the electricity of the battery pack is released through the ...

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Problems solved by technology

[0003] At present, the mainstream coupling method of photovoltaic inverters and energy storage inverters is DC coupling. DC coupling is relatively simple in control, but there is a problem of cooperation between photovoltaic and energy storage, which requires protocol docking and mutual control. In this way, photovoltaic inverters of different manufacturers It is difficult to cooperate with the inverter and the energy storage inverter, and the compatibility is poor

[0004] Some manufacturers have proposed the AC coupling method, but there is a problem of instability in the parallel connection of photovoltaic inverters and energy storage inverters under off-grid

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