Hybrid energy control system and control method of solid oxide fuel cell

A technology of solid oxide and mixed energy, applied in the direction of fuel cell control, fuel cell, fuel cell additives, etc., can solve the problems of shortened working life of lithium batteries, reduced system efficiency, slow dynamic response of output power, etc.

Active Publication Date: 2018-09-04
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, developed countries represented by the United States, Germany, and Japan have invested a lot of manpower and funds in the development of SOFC independent power generation systems, and there have been many researches and demonstrations on the design and implementation of energy management systems. The research on energy management has the following defects: (1) The dynamic response of the output power of the system is slow, and a response time of hundreds of seconds is required to track the load power, especially when responding to a large power surge, it is easy to cause a fuel shortage inside the SOFC stack Phenomenon; (2) When the system ...

Method used

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  • Hybrid energy control system and control method of solid oxide fuel cell
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  • Hybrid energy control system and control method of solid oxide fuel cell

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Embodiment 1

[0058] Such as figure 1 As shown, one embodiment of the present invention provides a hybrid energy control system for solid oxide fuel cells, the control system includes a controller 1, a state estimator 9, a bidirectional DC / DC converter 15, a controllable step-up DC / DC converter 21, PLC31, signal collector. The signal collector includes a battery temperature sampler 12 , a load current sampler 17 , a battery voltage sampler 10 , a converter voltage sampler 16 , and a battery current sampler 11 .

[0059] The input end and output end of the bidirectional DC / DC converter 15 are respectively connected to the lithium battery pack 13 and the load 18 via relays 14 and 19 . The input end and output end of the controllable step-up DC / DC converter 21 are respectively connected to the SOFC stack 25 and the DC bus. The load current sampler 17 detects the load current, and the converter voltage sampler 16 detects the output terminal voltage of the controllable step-up DC / DC converter...

Embodiment 2

[0065] Such as figure 2 As shown, the difference between Embodiment 2 and Embodiment 1 is that the signal collector also includes a converter current sampler 20, and the output terminal of the controllable step-up DC / DC converter 21 is connected to the load through the converter current sampler 20, The output terminal of the converter current sampler 20 is connected to the ADC terminal of the controller, the converter current sampler 20 is used to detect the output current of the controllable step-up DC / DC converter 21, and the ADC converts the output current of the converter current sampler 20 The signal is converted into a digital signal.

[0066] The concrete control diagram that generates the control signal of bidirectional DC / DC converter 15 in the controller is as image 3 As shown, by setting the air excess ratio AR, the fuel utilization rate FU and the set value I of the stack output current fcset , in order to control the gas temperature T inside the SOFC stack ma...

Embodiment 3

[0075] Such as Figure 4 As shown, the difference between embodiment 3 and embodiment 1 is: the signal collector also includes a combustion chamber temperature sampler 23 and a stack temperature sampler 24, the output end of the combustion chamber temperature sampler 23 and the stack temperature sampler 24 The output ends are all connected with the ADC end of the controller, and the ADC converts the output signal of the combustion chamber temperature sampler 23 and the output signal of the stack temperature sampler 24 into digital signals.

[0076] The specific control diagram for generating the correction value of the fuel flow control signal and the air flow control signal of the SOFC stack system in the controller is as follows: Figure 5 As shown, the sliding mode PID control is performed by detecting the difference between the combustion chamber temperature and the combustion chamber temperature setting value, and the correction of the fuel flow control signal and the air...

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PUM

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Abstract

The invention discloses a hybrid energy control system and a control method of a solid oxide fuel cell. The control system comprises a signal collector, a state estimator, a controller, a controllableboost DC/DC converter, a bi-directional DC/DC converter and a flux conditioner; the signal collector comprises a sampler used for collecting the voltage, the current and the temperature of a lithiumbattery pack, the load current and the voltage of the controllable boost DC/DC converter, and the state estimator obtains the SOC (stress optical coefficient) of the lithium battery pack according tothe voltage, the current and the temperature of the lithium battery pack; and the controller obtains the load power according to the load current and the output end voltage of the bi-directional DC/DCconverter, the controller determines the working state and electric pile output power of the lithium battery pack according to the load power and the SOC of the lithium battery pack, and outputs thecontrol signals of the bi-directional DC/DC converter and the controllable boost DC/DC converter, and the fuel flux, the air flux and the flux additional control signals of a SOFC (solid oxide fuel cell) electric pile system, and the flux conditioner controls the SOFC electric pile system.

Description

technical field [0001] The invention belongs to the field of solid oxide fuel cell power generation, and more specifically relates to a hybrid energy control system and control method of a solid oxide fuel cell. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is a power generation device that directly converts the chemical energy of fossil fuels into electrical energy and generates water through electrochemical reactions in a medium-high temperature environment. Compared with traditional power generation methods, SOFC has no mechanical movement and combustion process, and is not limited by the Carnot cycle, which greatly reduces noise and exhaust pollution and improves fuel utilization. Compared with proton exchange membrane fuel cell (PEMFC) and molten carbonate fuel cell (MCFC), SOFC has an all-solid structure and does not require noble metal electrode materials such as Pt. It has low manufacturing cost, no leakage corrosion, no electrode poisoning, fuel Wide r...

Claims

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Application Information

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IPC IPC(8): H01M8/04298H01M8/0432H01M8/0438H01M8/04537
CPCH01M8/04298H01M8/0432H01M8/0438H01M8/04537Y02E60/50
Inventor 李曦牛保群吴肖龙王飘飘蒋建华邓忠华
Owner HUAZHONG UNIV OF SCI & TECH
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