Research on Control Strategy of Combined Heat and Power System Based on PEMFC

Proton exchange membrane (PEM) fuel cells produce a large amount of waste heat while generating electricity through electrochemical reactions, making them suitable for driving combined heating and power (CHP) systems. According to the hourly thermal and electric loads in a two-story villa in Shanghai in summer, a CHP system based on PEMFC with a lithium-ion battery energy storage system and water tank heat storage system is proposed in this paper. The model of CHP system was established on MATLAB/Simulink platform. Switching control strategy and fuzzy control strategy were designed by using electric following strategy, and the CHP system model was simulated and analyzed under the same heat load and electricity load respectively. Simulation results show that the CHP system under the switching control strategy cannot provide heat when the fuel cell is shut down, and the battery in the CHP system under the fuzzy control strategy has the risk of overcharging. Therefore, this paper proposes a compound fuzzy control strategy，which can make the fuel cell work in the high efficiency zone and reduce the number of CHP system start and stop, in addition, it can avoid the safety problems caused by the overcharge of the battery.