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Method for adjusting output voltage of fuel cell and adjusting device used

A technology of output voltage and adjustment method, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large investment, increased weight and volume, and increased equipment, to achieve strong flexibility, improved output characteristics, Easy to design effects

Inactive Publication Date: 2005-06-15
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires large investment, increased equipment, increased weight and volume, and is only suitable for larger generator stations and larger systems; there is also a method called adding a backup battery, which uses the detection of output voltage Change the number of fuel cells participating in the working section, so that the output voltage tends to be consistent; however, it is at the expense of the backup battery

Method used

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  • Method for adjusting output voltage of fuel cell and adjusting device used
  • Method for adjusting output voltage of fuel cell and adjusting device used
  • Method for adjusting output voltage of fuel cell and adjusting device used

Examples

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Effect test

Embodiment 1

[0037] A fuel cell generator set with a capacity of 50KVA, its output characteristics are as follows: Figure 4 shown by the solid line. The user requires the output voltage range to be between 200 and 312 volts. After being adjusted by the method of the present invention, its output characteristic is as Figure 4 thick dotted line.

[0038] The curve formed by the points represents the power consumption caused by taking the measures of the present invention. The maximum power consumption point occurs at 6A, and its value is 190W. According to the voltage range required by the user, set the reference voltage V b =310VVw=305V, the technical parameters are as follows:

[0039] The third transistor IGBT adopts SKM400 GA1280, +Vcc2 and -Vcc2 in the power supply DC / DC are respectively +12V and -12V, +Vcc1 and -Vcc1 are respectively +12V and -12V, the primary amplifier IC1 adopts AD620, and the isolation amplifier IC2 adopts ISO124, the first to second transistors Q1 to Q2 use 8...

Embodiment 2

[0041] The output characteristics of a 5KVA fuel cell stack are as follows: Figure 5 , Vo=75V, Vmin=45V; the output voltage in the full power range of this embodiment is between 45-53V, and the maximum power consumption is 250W. The components of this embodiment are modified: the third transistor IGBT also uses CM200HA-12H.

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Abstract

This invention relates to an output voltage regulation technology to fuel batteries which applies a linear regulation control circuit and takes the output voltage of the fuel battery as the sample voltage. When the output voltage is higher than the requirement, the regulation circuit begins working and outputs Vw. When it is at the permit sphere, the relay in the regulation circuit connects the positive of the voltage regulation circuit input / output in short-circuit to be output by the fuel battery set directly, which greatly increases the output property of the set.

Description

technical field [0001] The invention relates to a technology for adjusting the output voltage of a fuel cell, in particular to a method for adjusting the output voltage of a fuel cell and a used adjusting device. Background technique [0002] In the prior art, the output volt-ampere characteristics of the fuel cell stack (see e.g. figure 1 The a.b.c.d curve in ) describes the change of the fuel cell stack voltage with the output current; it is characterized by a high open circuit voltage and a very large change in dynamic internal resistance. The dynamic internal resistance of segment ab and segment cd is very large and varies greatly, only the dynamic internal resistance of segment bc is stable and small, and segment cd is generally not used due to low efficiency. But in order to use the bc segment, the ab segment is the only way to pass and cannot be crossed. At present, many methods have been conceived at home and abroad to make the fuel cell stack output a stable volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46G05F1/56
Inventor 王俊清刘常福由勇刘超孙德尧
Owner SUNRISE POWER CO LTD
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