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Micro-grid operation mode seamless switching method based on energy storage current transformer

A technology of energy storage converters and micro-grids, which is applied in the field of power systems, can solve problems such as power outages, and achieve the effects of continuous power supply, guaranteed power supply, and consistent waveforms

Active Publication Date: 2014-02-05
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Switching between modes is still a technical bottleneck. When switching between grid-connected mode and off-grid mode, it is generally necessary to put the converter on standby first, causing the microgrid to change from grid-connected operation to island operation or from island operation to grid-connected operation. , the internal load will be cut off for a short time

Method used

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  • Micro-grid operation mode seamless switching method based on energy storage current transformer
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  • Micro-grid operation mode seamless switching method based on energy storage current transformer

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Embodiment Construction

[0031] In order to make the technical solutions and control advantages of the present invention clearer, the present invention will be explained in detail below in conjunction with the accompanying drawings.

[0032] Embodiments of the present invention provide a control strategy for seamless switching of microgrids based on energy storage converters. The control strategy of the present invention is based on the premise of not detecting the on-off state of the grid-connected switch, only by detecting changes in electrical quantities such as voltage and current, judging the change of the operating state of the micro-grid, and ensuring uninterrupted load control when the operating state of the micro-grid is switched. powered by.

[0033] The introduction of the embodiment of the present invention is based on the microgrid topology of the energy storage converter (see figure 1 ), which includes the main grid 1 and the microgrid 5, the main grid 1 and the microgrid 5 are connecte...

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Abstract

A micro-grid operation mode seamless switching method based on an energy storage current transformer achieves that when a micro-grid is converted from isolated island operation into grid-connected operation, the energy storage current transformer actively detects state switching of the micro-grid, and correspondingly the micro-grid is converted from off-network operation into grid-connected operation. Through quasi-synchronization grid-connected control, smooth transition from energy storage current transformer power supply to main grid power supply is achieved. A load side continuously supplies power, a load is not affected by voltage fluctuation generated when the micro-grid is connected to a main grid, and continuous power supply of the load is guaranteed. The micro-grid operation mode seamless switching method achieves continuous and uninterruptible power supply to the load in the switching process of the micro-grid operation states, and a control policy has good universality.

Description

Technical field: [0001] The invention belongs to the field of electric power systems, and relates to a micro-grid control technology including a distributed power supply, in particular to a seamless switching technology based on an energy storage converter. Background technique: [0002] The key technology of microgrid with distributed power is how to realize the coordinated operation of distributed power and large power grid. As a large number of distributed power sources are integrated into the grid, microgrids have been proposed as an organizational form that can fully utilize the potential of distributed power sources. A microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. The microgrid constitutes a controllable unit, which can realize self-control, protection and management, and can effectively coordinate the contradictio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32
Inventor 刘志超郭海峰张效宇张百华赵璐璐李永兴操丰梅李勇琦任秋利陈满周劲松
Owner BEIJING SIFANG JIBAO AUTOMATION
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