摘要
由于交流阻抗谱可以综合反映氢燃料质子交换膜燃料电池(PEMFC)的水、氧气和氢气含量等参数信息,为实现整车在线监控PEMFC的健康状态,文章提出一种基于Boost电路的扰动信号生成方法用于PEMFC电池的交流阻抗测试。其无需额外增加硬件电路,利用车上燃料电池升压DC/DC电源的主电路(多相Boost电路并联),以SPWM方式在输出直流电流上叠加设定频率、设定幅值的交流正弦波扰动;结合现有的DC/DC回路输入恒流PID控制算法,构建相应的数字控制器,并对实物样机进行生成信号测试分析,通过解析DC/DC输入侧扰动产生的交流电压及电流波动,测试各频率点的交流阻抗及相位变化,绘制相应的交流阻抗图谱。最后,文章基于PEMFC的Randles等效电路和燃料电池动力系统的电气原理,搭建试验测试台架进行模拟测试;通过对测试数据的对比分析,验证了本文所提出的扰动信号生成方法的有效性和准确性。
AC impedance spectrum can comprehensively reflect the parameter information of water, oxygen and hydrogen content of proton exchange membrane fuel cell(PEMFC). In order to realize online monitoring of the health status of the PEMFC of the whole vehicle, this paper presents a AC impedance test disturbance signal generation method for PEMFC based on Boost circuit.It does not need to add additional hardware circuits, uses the main circuit of fuel cell boost DC/DC(multi-phase Boost circuits are connected in parallel), and superimposes AC sine wave disturbance of set frequency and set amplitude on the output DC current in SPWM mode. Based on the input constant current PID control algorithm of the existing DC/DC loop, a corresponding digital controller is constructed, and the physical prototype is tested and analyzed for the generated signal. By analyzing the AC voltage and current fluctuations generated by the disturbance on the DC/DC input side, the AC impedance and phase changes at each frequency point are tested, and the corresponding AC impedance map is drawn. Based on the Randles equivalent circuit of PEMFC and the electrical principle of the fuel cell power system, this paper builds a test bench for simulation test. Through the comparative analysis of the test data, the effectiveness and accuracy of the disturbance signal generation method proposed in this paper are verified.
作者
沈泽华
彭再武
陈雄春
王坚
刘少春
SHEN Zehua;PENG Zaiwu;CHEN Xiongchun;WANG Jian;LIU Shaochun(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China)
出处
《控制与信息技术》
2022年第1期14-18,共5页
CONTROL AND INFORMATION TECHNOLOGY
关键词
质子交换膜燃料电池
BOOST电路
SPWM
交流阻抗测试
proton exchange membrane fuel cell(PEMFC)
Boost circuit
sinusoidal pulse width modulation(SPWM)
AC impedance test
