Off-grid photovoltaic power generation energy storage system and energy dispatching method thereof

Abstract

The invention discloses an off-grid photovoltaic power generation energy storage system and an energy dispatching method of the off-grid photovoltaic power generation energy storage system. The system comprises a photovoltaic power generation module, a photovoltaic controller, a rectifier, an inversion module, a rechargeable battery module, a battery management system, a central control unit, a displayer and a direct current converter. The photovoltaic power generation module is connected with an alternating current load through the photovoltaic controller and the inversion module, the end, connected with the inversion module, of the photovoltaic controller is connected with the rechargeable battery module through the direct current converter and is also connected with a power supply power grid through the rectifier, the inversion module is connected with the power supply power grid, the battery management system is connected with the rechargeable battery module, and the central control unit is connected with the photovoltaic controller, the rectifier, the inversion module, the battery management system, the direct current converter and the displayer. Charging and discharging control can be conducted according to load conditions and specific parameters of the rechargeable battery module, the optimal energy utilization rate is achieved, and the system is high in response speed, control efficiency and accuracy and can be widely applied to the photovoltaic power generation industry.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation energy storage, in particular to an off-grid 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 powe...

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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