Rural region distributed type photovoltaic vanadium liquid battery energy storage micro power grid system and control method

Abstract

The invention proposes a rural region distributed type photovoltaic vanadium liquid battery energy storage micro power grid system, comprising a vanadium liquid battery energy storage unit, a variable flow controller, a photovoltaic power generation unit, an inversion controller, an alternating current supply unit, a main controller and a user's load unit. The photovoltaic power generation unit can output the direct current through two channels with one channel for directly outputting the direct current to the direct current input end of the main controller so as to be combined with the vanadium liquid battery energy storage to form a photovoltaic energy storage loop and the other channel for connecting the direct current power with the inversion controller where after the rectification and inversion by the inverter, the power frequency alternating current is outputted. The power frequency alternating current is transmitted to the alternating current input end of the main controller through a power generation meter so as to be combined with the user's load unit to form a photovoltaic energy supply loop.

Description

technical field [0001] The invention relates to a photovoltaic microgrid system, in particular to a rural distributed photovoltaic vanadium liquid battery energy storage microgrid system and a control method. Background technique [0002] Distributed photovoltaic power generation specifically refers to a distributed power generation system that uses photovoltaic modules to directly convert solar energy into electrical energy. It is a new type of power generation and comprehensive utilization of energy with broad development prospects. It advocates the principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use. It can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also It effectively solves the problem of power loss in boosting and long-distance transportation. [0003] Distributed photovoltaic power generation in China has entered the promotion stage. At present, preferential polic...

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Problems solved by technology

The access of a large number of distributed photovoltaic power sources makes the transformation and management of the distribution network more complicated

[0005] 2. Rural power grids are very fragile, especially the majority of left-behind elderly people and children. During the daytime, electricity consumption is limited, and daytime is the main period of photovoltaic power generation. Photovoltaic power generation will increase the voltage on the user side, which will not only affect the efficiency of photovoltaic power generation, but also may affect Damage to electrical equipment

[0006] 3. Impact on power quality

Photovoltaic power generation is generally connected to the grid through inverters. The frequent switching on and off of such power electronic devices is prone to generate harmonic pollution to the grid

[0007] 4. The traditional distributed photovoltaic microgrid system can only see the power generation of the power station, but cannot respond to the maximum efficiency of power generation according to the actual lighting conditions and temperature conditions on site. To maintain the high efficiency of distributed photovoltaic power generation, it is necessary to Clean and maintain the power station. Small household power stations do not have a power station detection system, so it is difficult to maintain the power station in time, which affects the efficiency of photovoltaic power generation

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