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

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...

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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 frequently switches between different power modes, the gas temperature inside the SOFC stack and the combustion chamber easily exceeds the range of safety constraints, and it is difficult to effectively solve the problem of coordination between fast load tracking and temperature safety constraints. At the same time, the overall The system efficiency is significantly reduced; (3) The control of the charging and discharging current and remaining capacity of the lithium battery is ignored, resulting in a shortened working life of the lithium battery, which cannot meet the application scenarios that require long-term independent operation such as oceangoing and polar regions

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