Distributed type photovoltaic energy storage system and working method thereof

Abstract

The invention relates to a distributed type photovoltaic energy storage system and a working method of the distributed type photovoltaic energy storage system. The output end of a photovoltaic cell array is connected with a direct-current conversion module, and the output end of the direct-current conversion module is respectively connected with a grid-connected inverter module, an off-grid inverter module and an energy storage battery pack. The input end of a rectification conversion module is connected with a power grid, and the output end of the rectification conversion module is connected with the energy storage battery pack. The input end of the grid-connected inverter module is connected with the output end of the direct-current conversion module, and the output end of the grid-connected inverter module is connected with the power grid. The output end of the direct-current conversion module and the output end of the energy storage battery pack are connected with the input end of the off-grid inverter module, and the output end of the off-grid inverter module is connected with a load. An energy management system is respectively connected with each module to reasonably control, manage and distribute energy. The use ratio of solar energy is improved to the maximum degree, the distributed type photovoltaic energy storage system and the working method of the distributed type photovoltaic energy storage system are suitable for a photovoltaic grid-connected power generation system or a photovoltaic off-grid power generation system of an intermediate-low power grade, photovoltaic power generation and an energy storage technology are fully combined, intelligent control of photovoltaic power generation and energy storage is achieved, the power generating efficiency of the system is effectively improved, and losses are reduced.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation system, in particular to a distributed photovoltaic energy storage system and a working method thereof. Background technique [0002] Solar energy is rich in resources and widely distributed, and it is the renewable energy with the greatest development potential in the 21st century. With the increasingly serious problems of global energy shortage and environmental pollution, solar photovoltaic power generation has become an emerging industry that is widely concerned and focused on development because of its clean, safe, convenient, and high-efficiency characteristics. Since the 1990s, solar photovoltaic power generation has developed rapidly and has been widely used in aerospace, communications, transportation, and the lives of residents in remote areas. [0003] Solar photovoltaic power generation systems are divided into off-grid photovoltaic power generation systems and grid-connected p...

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Problems solved by technology

[0005] The present invention is aimed at the problem of high cost of application and popularization of photovoltaic power generation systems, and proposes a distributed photovoltaic energy storage system and its working method, combining the characteristics of the system's flexible switching of on-grid and off-grid operation modes, and ability to provide high-quality electric energy and The high-speed processing capability of the energy management system can realize the maximum power tracking MPPT of the photovoltaic cell array, the charging and discharging control of the battery energy storage component, and the optimal coordinated control of the two distributed power sources, and can complete the independent switching function of on-grid / off-grid power generation, maximizing Improve the utilization rate of solar energy, prolong the service life of energy storage battery components, improve the output power quality of the power generation system, and enhance the stability of the system, thereby improving the overall performance of the photovoltaic power generation system

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