Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid

A control method and seamless switching technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., to achieve the effects of improving power supply reliability and control flexibility, improving reliability, and improving energy saving and environmental protection benefits

Active Publication Date: 2015-02-18
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the energy storage converter operates flexibly and responds quickly, the synchronous cooperation of the three converters in the grid-connected / isolated dual-mode switching process has become a restrictive factor for the system switching. Currently, the scale of the microgrid using this technology is only Do tens of kilowatts

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  • Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid
  • Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid
  • Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid

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Embodiment Construction

[0041] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The invention provides a control method for automatic seamless switching between microgrid grid connection and isolated grid. The working principle diagram is as follows figure 1 shown.

[0043] The system involved in the method for automatically and seamlessly switching between grid-connected and isolated grids of the present invention includes a photovoltaic power generation system, a wind power generation system, an energy storage main grid unit, a micro-grid load, a filter compensation device, a tie switch and a synchronous generator. The on-off command of the tie switch is sent to the tie switch. By comparing the voltage deviation between the microgrid voltage and the large grid voltage, the microgrid voltage feedback signal and the large grid voltage feedback signal are transmitted to the energy storage main grid unit ...

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Abstract

The invention relates to the operation and control of a microgrid, in particular to a method for controlling automatic seamless switching between a grid-connected mode and a grid-isolated mode of the microgrid. The control method is characterized by comprising the following steps that: an energy storage dual-mode converter is used as a master power grid unit; power grid states are identified and the energy storage dual-mode converter mode is smoothly switched according to the identified power grid state; or microgrids are smoothly connected together simultaneously. By the technical scheme provided by the invention, energy complementary between the microgrid and a master power grid is realized, the power supply reliability of the microgrid is further improved simultaneously, and the automatic seamless switching between grid-connected / grid-isolated dual modes of the microgrid which adopts the energy storage unit as the master power grid unit of the microgrid can be realized.

Description

technical field [0001] The invention relates to the operation and control of a micro-grid, in particular to a control method for automatically and seamlessly switching between a micro-grid connected to a grid and an isolated grid. Background technique [0002] A microgrid is a collection of distributed power sources, energy storage units, loads, and control and protection devices. It is an autonomous system capable of self-control, protection, and management. The microgrid has two operation modes: grid-connected and isolated grid. The grid-connected mode means that under normal circumstances, the micro-grid and the large grid operate in parallel, providing excess power to the grid or supplementing the shortage of its own power generation by the grid. The isolated grid mode means that when a failure of the large grid is detected or the power quality does not meet the requirements, the micro grid can be disconnected from the large grid to form an isolated grid mode, and the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/00
CPCY02P80/14
Inventor 刘纯李光辉何国庆鲍薇郭立东
Owner CHINA ELECTRIC POWER RES INST
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