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Coupling device and coupling method of DC-DC converter and SPE electrolyzer

A technology of DC converter and coupling device, which is applied in the direction of conversion of DC power input to DC power output, output power conversion device, electrolysis process, etc., which can solve the problems of short battery life, low conversion efficiency, and photovoltaic power plant abandonment, etc. Achieve the effect of reducing equipment cost, low cost, and reducing failure rate

Active Publication Date: 2017-10-31
XINJIANG INST OF ENG
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  • Abstract
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Problems solved by technology

[0007] In view of the above-mentioned technical problems, the present invention provides a coupling device and coupling method for a DC-DC converter and an SPE electrolytic cell, which solves the common problem of light abandonment in photovoltaic power plants, and at the same time solves the indirect connection between photovoltaic modules and electrolytic cells that are commonly used now. The battery life of the coupling connection is short, the conversion efficiency is low, etc.

Method used

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  • Coupling device and coupling method of DC-DC converter and SPE electrolyzer
  • Coupling device and coupling method of DC-DC converter and SPE electrolyzer

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Embodiment Construction

[0019] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0020] Such as figure 1 As shown, the output DC voltage of the photovoltaic module 1 is connected to the input terminal of the DC / DC converter 2, the DC / DC converter 2 performs chopping modulation, and the voltage is modulated to the working voltage of the SPE electrolyzer 3, so that the electrolyzer Work at the safe working point, thereby improving the hydrogen production efficiency of the electrolyzer.

[0021] Such as figure 2 As shown, the coupling method of the DC-DC converter and the SPE electrolyzer includes the following process:

[0022] Initial operation, according to the measured input voltage V of the DC / DC converter i , input current I i , output voltage V o , output current I o , calculate dV i , dI i 、d 2 V o , dI o ;Introduce the number of iterations k to calculate the system error generated after the external conditions change; ...

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Abstract

The invention relates to an energy device, in particular to a DC-DC converter and SPE electrolytic cell coupling device and method. The coupling device relates to a DC-DC converter, the DC voltage output by a photovoltaic module is connected to the input end of the DC-DC converter for chopper modulation through the DC-DC converter, so that voltage is modulated into the working voltage of an SPE electrolytic cell and the electrolytic cell works at a safe working point, and then the hydrogen production efficiency of the electrolytic cell is improved. By the adoption of the method and device, equipment cost is reduced, the system structure is simplified, and the failure rate is reduced; the DC-DC converter can find the optimal duty ratio (rho) to enable the photovoltaic module to work at the maximum power working point and guarantee that the electrolytic cell works at a safe working point.

Description

technical field [0001] The invention relates to an energy device, in particular to a coupling device and a coupling method for a DC-DC converter and an SPE electrolyzer. Background technique [0002] With the deepening of hydrogen energy research and the gradual attention of various countries to the hydrogen energy industry, electrolysis of water hydrogen production technology has been developed rapidly, and now there are three main electrolysis methods: alkaline aqueous solution electrolysis, solid polymer water electrolysis (SPE) and solid oxide water electrolysis. Among them, the solid polymer water electrolysis method is considered to be the most promising electrolysis method, but no matter which method, the current hydrogen production efficiency is low. According to statistics, about 5KW electricity can produce 1m 3 Hydrogen, while consuming about 0.8m 3 Ultra-pure water, while the efficiency of converting hydrogen energy into electrical energy with fuel cells is abou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B9/04H02M3/00H02S40/30
CPCC25B1/04C25B9/65H02M3/00H02S40/00Y02E10/56Y02E60/36
Inventor 徐立军徐蕾代元军段友莲董晓红杨峰汪继伟侯晓静
Owner XINJIANG INST OF ENG
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