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Seamless switching control method for uninterrupted power supply of fuel cell

A fuel cell and seamless switching technology, which is applied in the direction of emergency power supply arrangements, electrical components, circuit devices, etc., can solve problems such as threats to the safety and service life of fuel cells, startup failure, etc., to avoid direct load cold start and ensure safety and service life, to ensure the continuity of the effect

Active Publication Date: 2013-06-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the switching method of the traditional uninterruptible power supply, the fuel cell is directly loaded and cold-started, and there will be startup failure, which will threaten the safety and service life of the fuel cell

Method used

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  • Seamless switching control method for uninterrupted power supply of fuel cell
  • Seamless switching control method for uninterrupted power supply of fuel cell
  • Seamless switching control method for uninterrupted power supply of fuel cell

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with drawings and embodiments.

[0026] Such as figure 1 As shown, the schematic diagram of the overall switching control method of the present invention, the main circuit includes a bypass switch, a rectifier, an inverter, a fuel cell, a DC-DC converter, and an energy management unit. When the power grid fails, the inverter power supply mode needs to be converted to the fuel cell power supply mode. When the power grid is restored, the fuel cell power supply mode needs to be converted to the inverter power supply mode. During the switching process between the inverter power supply mode and the fuel cell power supply mode, the switching control of the energy management unit is through the first supercapacitor voltage control link 18, the second supercapacitor voltage control link 17, the first bus low-frequency current detection link 13, the second Bus low-frequency current detection link 11, first bu...

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Abstract

The invention discloses a seamless switching control method for an uninterrupted power supply of a fuel cell. During switching from an inverse power supply mode to a fuel cell power supply mode, an energy management unit is used for controlling bus voltage at the cold start stage of the fuel cell, and load energy is provided; once idle-load cold start of the fuel cell is completed, a direct current-direct current transformer is started to control the bus voltage, and the energy management unit is switched to the current control mode for controlling output current to fall slowly, so that the output current of the fuel cell rises slowly; and during switching from the fuel cell power supply mode to the inverse power supply mode, a rectifier is started to control the bus voltage and the direct current-direct current transformer is switched to the current control mode for controlling the output current of the fuel cell to fall slowly. According to the method, seamless switching between thefuel cell power supply mode and the inverse power supply mode is realized, direct loaded cold start of the fuel cell is avoided, slow change of the output power of the fuel cell is controlled, the safety and service life of the fuel cell are ensured, and the load power supply continuity is ensured in the switching process.

Description

technical field [0001] The invention relates to a control method for seamless switching of an uninterruptible power supply, in particular to a control method for seamless switching of a fuel cell uninterruptible power supply. Background technique [0002] An uninterruptible power supply device using a fuel cell as a backup power source has the advantages of long backup time, high reliability, and environmental protection compared with an uninterruptible power supply device using a battery as a backup energy source. The fuel cell uninterruptible power supply system should not only ensure the normal operation of the working mode, but also need to realize the seamless switching between the working modes and realize the continuous power supply. In order to ensure the long life of the fuel cell, the fuel cell adopts a cold standby mode. At the same time, the output response inertia of the fuel cell is large, and frequent rapid load fluctuations will shorten the life of the fuel c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06
Inventor 张文平徐德鸿李霄董德智陈敏谢人李海津吴小田孙超
Owner ZHEJIANG UNIV
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