基于双二阶广义积分锁相环的燃料电池并网系统研究

针对燃料电池发电系统运行特性,建立了燃料电池并网控制系统模型,并设计了并网逆变器的有功/无功控制策略和基于双二阶广义积分器的锁相环(DSOGI-PLL)方案。通过在电网三相电压理想工况和三相电压不平衡条件下的仿真测试,证明了所建立的并网控制系统能够实现单位功率因数运行。而且所设计的DSOGI-PLL能够在单相和两相电压故障情况下快速、准确地跟踪电网电压的频率和相位,具有较好的频率自适应及对输入信号的滤波功能。验证了所设计并网系统的正确性和有效性。

Fuel cell grid-connected system based on dual second order generalized integrator phase locked loop

According to the operating characteristics of a fuel cell power generation system, a fuel cell grid-connected control system model is developed. An active and reactive power control strategy for grid-connected inverter and a phase locked loop based on dual second order generalized integrator (DSOGI-PLL) are also designed. Under both the normal and the faulty three-phase voltage conditions, the simulation results demonstrate that the grid-connected control system can achieve unit power factor operation. Furthermore, the proposed DSOGI-PLL is able to detect the grid voltage frequency and phase quickly and accurately under one phase and two phase voltage faulty conditions, and is provided with adaptive frequency and filtering function. The correctness and validity of the proposed grid-connected system is also verified.