PARALLEL PHOTOVOLTAIC ENERGY STORAGE SYSTEM, CONTROL METHOD, PHOTOVOLTAIC ENERGY STORAGE MASTER AND SLAVE THEREOF

Embodiments of the present invention relate to the technical field of photovoltaic grid connection, and disclose a parallel photovoltaic energy storage system, a control method thereof, and a mode of parallel connection of a photovoltaic energy storage master and photovoltaic energy storage slaves. The system comprises a plurality of photovoltaic modules, a grid, a plurality of loads and a plurality of photovoltaic energy storage devices. The method firstly selects one of the photovoltaic energy storage devices as a photovoltaic energy storage master and takes other photovoltaic energy storage devices as photovoltaic energy storage slaves, and then determines whether the grid is connected to the parallel photovoltaic energy storage system. If it is connected, the grid-connected power of the grid and the power of each photovoltaic energy storage slave are adjusted so that the grid and the photovoltaic energy storage device supply power to the load; otherwise, each photovoltaic energy storage slave can be adjusted for emergency power supply.