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对于含有可再生能源发电的微电网,储氢是调节可再生能源波动性的重要手段。燃料电池是常用的将存储的氢能转化为电能回馈给电网的直流型分布式发电设备。建立了典型固体氧化物燃料电池(Solid Oxide Fuel Cell,SOFC)的并网系统模型,其中主要包括燃料电池堆动态模型、原动机控制模型以及电力电子设备构成的能量转换装置模型。主要分析了SOFC的负荷跟随特性、电力电子装置的快速功率调节特性,研究了燃料电池并网系统对提高配电系统电压稳定性的作用,最后通过算例验证了该方法的有效性。
For microgrids with renewable energy generation, hydrogen storage is an important means of regulating the volatility of renewable energy sources. Fuel cells are commonly used DC-based distributed generation devices that convert stored hydrogen energy into electricity back to the grid. A grid-connected system model of a typical solid oxide fuel cell (SOFC) is established. The model includes the dynamic model of the fuel cell stack, the control model of the prime mover and the power conversion device model of the power electronic device. This paper mainly analyzes the load following characteristics of SOFC and the fast power regulation characteristics of power electronic devices. It also studies the effect of fuel cell grid interconnection system on the voltage stability of distribution system. Finally, an example is given to verify the effectiveness of this method.