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A fuel cell uninterruptible power supply device

A technology for fuel cells and power supply devices, applied in battery circuit devices, circuit devices, output power conversion devices, etc., can solve the problems of large volume and weight, increase system cost, poor reliability, etc., and achieve long service life and backup time. Long, the effect of suppressing DC voltage pulsation

Active Publication Date: 2011-12-21
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practice of using larger capacitors will lead to larger volume and weight of the system, and the capacitors applied to this higher voltage and larger capacitance are usually electrolytic capacitors, which brings poor reliability and short life. and other issues; and if the method of adding an additional switch bridge arm will increase the system cost

Method used

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  • A fuel cell uninterruptible power supply device
  • A fuel cell uninterruptible power supply device

Examples

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Embodiment Construction

[0020] refer to figure 1 , the fuel cell uninterruptible power supply device of the present invention, including a main circuit and a control system;

[0021] The main circuit includes a bypass switch 1, a three-phase four-wire rectifier 2, a three-phase four-wire inverter 3, a fuel cell 4, a DC-DC converter 5, a bidirectional DC-DC converter 6 and a supercapacitor bank 7, three-phase The AC input terminal of the four-wire rectifier 2 and the input terminal of the bypass switch 1 are jointly connected to the power grid, and the DC output terminal of the three-phase four-wire rectifier 2 is connected to the three-phase four-wire inverter 3 through the positive and negative DC buses and the midpoint line. The DC input terminals are connected, the AC output terminal of the three-phase four-wire inverter 3 and the output terminal of the bypass switch 1 are jointly connected to the AC load, the output terminal of the fuel cell 4 is connected to the input terminal of the DC-DC conve...

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Abstract

The fuel cell uninterruptible power supply device disclosed in the present invention includes a main circuit and a control system. The main circuit includes a bypass switch, a three-phase four-wire rectifier, a three-phase four-wire inverter, a fuel cell, a DC-DC converter, a bidirectional DC- DC converter and super capacitor bank, the control system includes DC bus voltage detection link, super capacitor bank voltage control link, two DC bus input and output side current detection links, two inner loop current control links, DC bus midpoint voltage equalization control links. The device provides medium and low-frequency AC components of the DC bus current through a bidirectional DC-DC converter and a super capacitor bank, and at the same time controls the balance of the positive and negative DC bus voltages, and effectively suppresses the positive and negative DC bus voltages when the power grid is asymmetrical or the load is unbalanced. The low-frequency pulsation makes the reliability and life of the fuel cell uninterruptible power supply system no longer limited by the reliability and life of the electrolytic capacitor, which improves the reliability and life of the uninterruptible power supply device.

Description

technical field [0001] The invention relates to an uninterruptible power supply device, especially an uninterruptible power supply device using a fuel cell as a backup 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 current fuel cell power generation system has poor dynamic characteristics due to the performance constraints of mechanical links in the system. When the uninterruptible power supply is switched from the grid power supply to the fuel cell power supply and when the load is suddenly changed under the fuel cell power supply state, the dynamic performance of the fuel cell is difficult to meet the power supply requirements of the load, and the rapid power supply change will affect the service life of the fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/34H02M1/14
Inventor 徐德鸿杜成瑞沈国桥朱选才
Owner ZHEJIANG UNIV
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