分布式发电中燃料电池并网的建模及其仿真

摘要

Connecting fuel cell with power grid through inverter may produce a large number of harmonics, a solution of adding a filter for harmonic pollution to power systems was proposed in the paper. A fuel cell, a inverter, a filter and a transformer simulation models were built with Matlab/Simulink software, and the voltage of fuel cell is controllable using PWM technology. Added a filter, the harmonic pollution brought by fuel cell is reduced effectively and the power quality becomes better. Simulation results show that the prposed method is simple and has good dynamic characteristics, which provide the theoretical and methodological reference to the connection fuel cell with power grid.%针对燃料电池通过逆变器并网产生大量谐波的问题,提出在燃料电池并网前加设一个谐波滤除装置,以达到减少燃料电池并网对电力系统的谐波污染的目的.通过Matlab/Simulink仿真软件建立了包含燃料电池,变频器,滤波器以及变压器的并网仿真模型,利用脉宽调制(PWM)技术控制变频器的占空比实现了对燃料电池输出电压的控制,经过滤波后通过变压器并入电网,有效地减少了燃料电池并网带来的谐波污染,提高了电能质量.仿真结果表明,该燃料电池并网模型结构简单,动态特性良好,为实现燃料电池安全高效地并人电网提供了理论和方法参考.