Research on Supply-Demand Matching Characteristics in Interconnected Operation of Multiple Combined Cooling, Heating and Power Systems

In view of the issue of low energy utilization efficiency resulting from the monotonous operation mode of combined heat, power, and cooling systems. This paper integrates the following electric load (FEL), following thermal load (FTL), and following hybrid electric-heating load (FHL) operation strategies to first establish an interconnected operation model for combined cooling, heating, and power (CCHP) systems. Through the combination of strategies, and then taking the hotel and office building in a certain area of northern China as the research object, based on the traditional separate supply system, the comprehensive performance index, energy factor and supply and demand matching degree of the two CCHP systems under the interconnected and independent operation are calculated. The comprehensive performance and supply and demand matching characteristics of the system under different strategy combinations are further analyzed, and the optimal strategy combination of the system performance under the interconnected operation mode is obtained. Research findings indicate that under nine combinations of three strategies, the comprehensive performance and supply-demand matching characteristics of the two CCHP systems demonstrate varying degrees of improvement when operated in an interconnected manner compared to independent operation. Particularly when both the hotel and office building CCHP systems operate under the FTL strategy, the comprehensive performance of the interconnected system improves by 9.14% compared to independent operation. At this point, the system achieves its minimum energy factor of 6.56% and maximum supply-demand matching ratio of 0.9759, demonstrating optimal supply-demand matching characteristics. Concurrently, the system exhibits its best overall performance at 43.89%.