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Grid-connected non-networking micro-grid system and control protection method thereof

A micro-grid and central controller technology, which is applied to the grid-connected and non-grid-connected micro-grid system and its control and protection fields, can solve the impact of the safe and stable operation of the power grid, the power quality of the distribution network, the reliability of power supply, and the influence and distribution of relay protection. The grid-connected power generation does not have the characteristics of being grid-friendly, and achieves the effect of reducing electricity demand, good project demonstration benefits, good power supply reliability and power quality.

Active Publication Date: 2012-09-12
GUODIAN UNITED POWER TECH
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Problems solved by technology

[0006] However, distributed energy grid-connected power generation does not have the characteristics of grid-friendliness. If it is directly fed into the grid, it will have a certain impact on the safe and stable operation of the grid, especially the power quality, power supply reliability and relay protection of the distribution network. will have a greater impact

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  • Grid-connected non-networking micro-grid system and control protection method thereof
  • Grid-connected non-networking micro-grid system and control protection method thereof

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Embodiment Construction

[0031] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0032] The structure of a grid-connected and off-grid micro-grid system of the present invention is as follows: figure 1 As shown, including distributed power generation systems (wind power generation systems, photovoltaic power generation systems), distributed energy storage systems (battery energy storage systems) and user loads (local loads, conventional loads); among them, distributed power generation systems and distributed The energy storage system is connected to the 380V low-voltage AC busbar through its own energy conversion equipment, and the low-voltage AC busbar is then connected to the 10kV high-voltage AC busbar through a step-up transformer to realize ...

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Abstract

The invention discloses a grid-connected non-networking micro-grid system and a control protection method thereof. On the premise of basically not changing the structure of the original power distribution system, multiple types of distributed power sources, such as wind power generation system, photovoltaic power generation system, cell accumulation system and the like, are connected into a common power grid along with user loads through AC buses, and reasonable load layout and active energy management are utilized to implement grid-connected non-networking of the micro-grid system. By using the structural design and the active energy management of the micro-grid central control unit, the new energy power generation system can be completely self-sufficient, and does not reversely transmit power to the common power grid, thereby avoiding impacting the normal power supply of the common power grid; and meanwhile, by the aid of the common power grid, the user loads have higher power supply reliability and electric power quality.

Description

technical field [0001] The present invention relates to the technical field of microgrid integrated application, microgrid energy management and control, and specifically relates to a grid-connected and off-grid microgrid system and a control and protection method thereof. Background technique [0002] In recent years, with the continuous development and improvement of new energy power generation technology, the power generation penetration rate of intermittent energy sources such as wind energy and solar energy has also been increasing. The impact on the public grid is often reduced by means of confinement and isolation. [0003] In order to weaken the impact and negative impact of distributed power generation on the public power grid, optimizing and integrating the distributed power generation system through micro-grid integration technology can well solve the current difficulty of large-scale distributed power generation grid connection. [0004] Generally speaking, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/28
Inventor 周志超许伟秦明王文亮所旭张宪平王欢
Owner GUODIAN UNITED POWER TECH
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