基于MMC的质子交换膜燃料电池并网研究

MMC-based proton exchange membrane fuel cell grid-connected research

模块化多电平换流器(MMC)发展快速并日趋成熟,为解决质子交换膜燃料电池(PEMFC)并网问题,采用MMC替代传统换流器,将电池经DC-DC电路与MMC的子模块(SM)相连,增大输出功率,同时充分发挥MMC换流器优势改进燃料电池并网系统。对PEMFC原理、静态特性及整个并网系统拓扑结构、控制策略、控制结构等进行了分析研究,并在此基础上采用内外环解耦控制,改善控制器,搭建了基于MMC变换器的PEMFC并网仿真模型。经仿真验证,该系统可实现顺利并网,电压电流谐波含量值低于相关标准,波形稳定,电容电压保持均衡,优势明显,在分布式新能源发电和大功率储能单元应用中,具有重要的研究价值,较广的应用前景。

The modular multilevel converter(MMC)is developing rapidly and is becoming more and more mature.In order to solve the grid connection problem of the proton exchange membrane fuel cell(PEMFC),this paper uses MMC instead of the traditional converter,and passes the battery through the DC-DC circuit and MMC.The sub-modules(SM)are connected to increase the output power,while taking full advantage of the MMC converter to improve the fuel cell grid-connected system.Analyze and study the principles,static characteristics,and topology of the entire grid-connected system,control strategy,and control structure.Based on this,the inner and outer loop decoupling control is used to improve the controller.A PEMFC based on MMC converter is built.Network simulation model.After simulation verification,the system can be smoothly connected to the grid,the voltage and current harmonic content values are lower than the relevant standards,the waveform is stable,the capacitor voltage remains balanced,and the advantages are obvious.Important research value and broad application prospects.