Distributed photovoltaic energy storage system and energy management method

Abstract

The invention relates to a distributed photovoltaic energy storage system and an energy management method. The system comprises a photovoltaic cell array and an energy storage cell component; a converter device comprises a photovoltaic cell direct current conversion module, an energy storage cell direct current conversion module, a rectification conversion module, a grid-connected inverter module and an off-grid inverter module; the energy management system is connected with each module; a layered control strategy is applied to optimize operation of the distributed photovoltaic energy storage system; a central decision-making level makes an operating strategy of the whole system according to current energy conditions and feeding characteristics of each power supply; a centralized control level monitors states of distributed power supplies in real time and takes corresponding control measures under different energy conditions; and a local executing level selectively cuts a part of loads or stores surplus electricity into an energy storage cell according to the load requirement of an actual system and the energy conditions. Photovoltaic power generation and energy storage technologies are sufficiently combined, so that the photovoltaic and the energy storage are intelligently controlled, and the energy management efficiency, the power supply reliability, power quality and the like of the system are effectively improved.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation system, in particular to a distributed photovoltaic energy storage system and an energy management method. 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. 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 system is a form of distributed power generation. It is mainly composed of distributed power supply medium, energy conversion device, load and energy management system. Through the coordinated control of the energy management system, the self-control, protection and management of the system can be realized. It can be operated in parallel with the external power grid or independ...

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Problems solved by technology

[0005] The present invention aims at the problems of single function, high cost and low efficiency of the existing photovoltaic power generation energy management system, and proposes a distributed photovoltaic energy storage system and energy management method. The characteristic of being able to provide high-quality electric energy and the high-speed processing capability of the hierarchical control of the energy management system can realize the maximum power tracking MPPT of the photovoltaic cell array, the charge and discharge control of the battery energy storage component, and the optimal coordinated control of the two distributed power sources. On / off-grid power generation autonomous switching function maximizes the utilization of solar energy, prolongs the service life of energy storage battery components, improves the output power quality of the power generation system, and enhances system stability, thereby improving the overall performance of the photovoltaic power generation system

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