Photovoltaic generating energy storage system and energy scheduling method thereof

Abstract

The invention discloses a photovoltaic generating energy storage system and an energy scheduling method thereof. The system consists of a photovoltaic generating module, a photovoltaic controller, a bidirectional inverter, a rechargeable battery module, a switching device, a battery management system, a central controller, a display and a direct-current converter. The photovoltaic generating module is connected with an alternating-current load by the photovoltaic controller and the bidirectional inverter successively; a connecting end between the photovoltaic controller and the bidirectional inverter is connected with the rechargeable battery module by the direct-current converter; and the battery management system is connected with the rechargeable battery module. The central controller is respectively connected with the photovoltaic controller, the bidirectional inverter, the battery management system, the direct-current converter and the display by communication buses and is connected with a power supply grid by the switching device. According to the invention, charging and discharging control can be carried out according to the load situation and concrete parameters of the rechargeable battery module, thereby realizing the optimum energy utilization rate. Moreover, the control efficiency is high; the response speed is fast; and the control accuracy is high. The system and the method can be widely applied to the photovoltaic generation industry.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation energy storage, in particular to a photovoltaic power generation energy storage system and an energy scheduling method thereof. Background technique [0002] The problem of energy shortage is a very important problem in the 21st century, and one of the best ways to solve this problem is to use solar power to generate electricity. Solar energy is widely distributed and nearly endless, but one problem with photovoltaic power generation systems using solar power is that photovoltaic resources are also intermittent and uncertain, making it difficult to provide a continuous and stable power supply for loads. Currently, commonly used The method is to use the energy storage system to store or release electric energy, thereby reducing the impact of weather on the photovoltaic power generation system, stabilizing power supply for users, and ensuring the reliability and quality of power supply. ...

AI Technical Summary

Problems solved by technology

Solar energy is widely distributed and nearly endless, but one problem with photovoltaic power generation systems using solar power is that photovoltaic resources are also intermittent and uncertain, making it difficult to provide a continuous and stable power supply for loads. Currently, commonly used The method is to use the energy storage system to store or release electric energy, thereby reducing the impact of weather on the photovoltaic power generation system, stabilizing power supply for users, and ensuring the reliability and quality of power supply

In order to further improve the energy management efficiency of the photovoltaic power generation system, a battery management system is generally set up to manage it, but this method simply controls the charging and discharging of the battery module. With the increase of photovoltaic power generation system components and the expansion of functions, This control method is increasingly showing defects such as low efficiency, slow response, and poor control accuracy, and it cannot perform charge and discharge control according to the load situation and the parameters of the battery module, and the energy utilization efficiency is low.

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