Grid-connected system

Abstract

The invention discloses a grid-connected system which comprises an electricity-generating part (4), a first detection device (1), an energy storage device, a charging and discharging device (6) of a power grid (5) and a control device (2), wherein the first detection device (1) is used for detecting the generated electricity of the electricity-generating part (4), the energy storage device is used for storing surplus electricity, the charging and discharging device (6) of the power grid (5) is used for communicating the energy storage device with the electricity-generating part (4) or the energy storage device with the grid-connected system, the control device (2) is used for controlling the energy storage device to be charged and discharged, the energy storage device comprises an energy storage battery (31) and a battery protection device for protecting the energy storage battery (31), and the energy storage battery (31) and the battery protection device are controlled by the control device to be charged and discharged. The energy storage device provided by the invention has longer service life, the use cost of the generating system is decreased.

Description

technical field [0001] The invention relates to the field of power generation systems, in particular to a grid-connected power generation system. Background technique [0002] With the adjustment of the national economic structure and the increase in the proportion of residents' electricity consumption, as well as the increasing scarcity of traditional energy sources, the application of new energy sources such as wind energy and solar energy has become more and more extensive, and the power generation scale of new energy sources has also increased rapidly. [0003] Power generation systems are generally divided into off-grid systems and grid-connected systems. The off-grid system is not associated with the power grid, operates independently, and has a small power generation. It is mainly used for daily electricity consumption or short-term emergency power consumption by residents in areas without electricity, and its application range is relatively limited. After the genera...

AI Technical Summary

Problems solved by technology

[0005] However, due to the large fluctuations in the power generated by wind power or solar power generation components, it is necessary for the energy storage device to be able to charge or discharge at a faster rate, that is, when the instantaneous power generation of the power generation components is large, it is necessary to Fast charging of the energy storage device; when the instantaneous power generation of the power generation component is small, the energy storage device needs to be discharged quickly, and charging or discharging with a large current can easily cause great damage to the energy storage device and seriously affect the energy storage device. service life, resulting in an increase in the cost of new energy power generation

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