In order to solve the problem of power supply and heating in remote rural household of north China, taking rural houses in Yinchuan as the research object, a solar-proton exchange membrane fuel cell (PEMFC) combined heat and power (CHP) system that is suitable for supplying power and heating to household in remote rural areas in north China is proposed in this paper. The simulation model is developed by using the MATLAB/Simulink platform and the effects of key operating parameters (i.e. current density and active area) on the performances of the PEMFC are studied. And the control effects of PID and fuzzy PID on the outlet temperature of the PEMFC stack are analyzed. The changes in temperature of water tank and indoor heating temperature under different electric loads and solar radiation are compared and studied. Meanwhile, the change in temperature of water tank is analyzed with or without solar energy, and the electrical efficiency, thermal efficiency, and CHP efficiency of PEMFC CHP are studied. The results show that the current density and active area have a significant impact on PEMFC stack. The temperature of water tank can be increased by 20 degrees C combining solar energy and PEMFC. In winter, under different electric loads and solar radiation, the solar-PEMFC CHP system can make the temperature of the water tank reach above 55 degrees C, and make the indoor heating temperature reach 20 degrees C similar to 27 degrees C.In addition, the maximum efficiency of PEMFC CHP system is about 83%.

为了培养学生的PLC工程应用能力,本文提出了一种基于CDIO-OBE模式的PLC课程教学改革.结合CDIO和OBE应用型人才的培养理念,重点培养学生实际工程的应用能力.课程改革内容主要包括对PLC课程目标、教学大纲、教材、教学内容和教学方法的改革,以及使用OBE的考核方式进行学习考核.通过该课程改革可以使学生的学习能力和实践应用能力得到增强,教学效果得以提升.

家用燃料电池热电联供技术,是燃料电池应用领域的一个具有广阔发展前景的研究方向.质子交换膜燃料电池在运行时消耗燃料中的化学能,同时除了将一部分化学能转化为电能外,其余部分的化学能则以热量的形式散失.如果对这部分热量不能进行合理有效地利用,那么将会导致系统的能源利用率降低,同时还会影响燃料电池的安全运行.因此在正常发电的前提下,为了对质子交换膜燃料电池在运行过程中产生的热量进行回收利用,本文提供了一种水冷型质子交换膜燃料电池热电联供方案.通过冷却液将电堆产生的热量带出,并在换热器中将吸热后的高温冷却液与常温自来水进行热量交换,同时使用水箱储存热水,实现热量回收利用.基于MATLAB/Simulink软件平台建立了燃料电池热电联供系统仿真模型,主要包括电堆模型、散热器模型、储热水箱模型等.同时设计了系统在不同工作模式下的控制策略和用于电堆温度控制的模糊PID控制器.结果表明,通过采用模糊PID控制器对系统进行控制仿真,系统可获得良好的动态响应和抗干扰性能.同时通过仿真得到系统在功率负载范围内最大热电联供效率约为83％,满足了家庭的日常供热和用电需求,提高了能源的利用率.