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A grid-connected microgrid coordination control system and method thereof

A coordinated control system and coordinated control technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as failing to consider the stability of the microgrid system, microgrid off-grid failure, etc., to achieve fault isolation and recovery , shorten the transient fluctuation process, and reduce the effect of communication delay

Inactive Publication Date: 2018-12-21
TIANCHANG TIANNENG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention fails to consider the stability of the microgrid system after fault off-grid, which may lead to microgrid off-grid failure

Method used

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  • A grid-connected microgrid coordination control system and method thereof
  • A grid-connected microgrid coordination control system and method thereof
  • A grid-connected microgrid coordination control system and method thereof

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Embodiment Construction

[0048] refer to figure 1 , a grid-connected micro-grid coordination control system proposed by the present invention is characterized in that it includes: a grid coordination controller.

[0049] In the microgrid, each energy storage unit and each renewable power source (RE) are connected to the microgrid bus through a power switch, and each branch connected to the microgrid bus is equipped with a branch outlet circuit breaker. Each load in the microgrid is connected in series with a load switch. The micro-grid bus is also connected to the system grid through a grid-connected switch. Renewable power sources include wind power and / or photovoltaic power, and possibly other intermittent power sources.

[0050] Each power supply switch, each load switch, each branch outlet circuit breaker and grid-connected switch are respectively equipped with a remote terminal unit (RTU), wherein the remote terminal unit corresponding to the grid-connected switch is used as the grid-connected ...

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PUM

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Abstract

The invention provides a grid-connected micro-grid coordination control system, comprising: a grid coordination controller; In the microgrid, each energy storage unit and each renewable power supply are connected to the microgrid bus through a power supply switch, and each branch of the microgrid bus is provided with a branch outlet circuit breaker. A load switch is connected in series with each load in the microgrid; The micro-grid bus is also connected to the system grid through the grid-connected switch. Each power supply switch, each load switch, each branch outlet circuit breaker and grid-connected switch are respectively provided with a remote terminal device; The grid coordination controller is respectively connected with each energy storage unit, each renewable power source and each remote terminal equipment. The invention is suitable for grid-connected micro-grid, can maintain the stability in the process of unplanned and off-grid handover, and is suitable for practical engineering application.

Description

technical field [0001] The invention relates to the technical field of smart grids, in particular to a grid-connected micro-grid coordination control system and a method thereof. Background technique [0002] Microgrids are divided into grid-connected and independent types, which can realize self-control and autonomous management. The grid-connected microgrid is usually connected to the external grid to improve the economic benefits of the microgrid system; the energy storage converter (PCS) of the grid-connected microgrid often adopts PQ control (active power and reactive power control) in the grid-connected state. Satisfies the fast and precise control of power; in the off-grid state, droop control is often used to maintain the voltage frequency of the system. When the system fails, the grid-connected microgrid will automatically leave the grid to ensure uninterrupted power supply for important loads in the grid; when the system restores power supply, it needs to be conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382
Inventor 李永军
Owner TIANCHANG TIANNENG NEW ENERGY CO LTD
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