综合能源系统能效评价方法初探

Preliminary exploration of efficiency evaluation for integrated energy system

为合理评价综合能源的整体性能,突出系统低碳高效的核心特征,指导可再生能源安全消纳,提出了一种加权能源利用率评价指标。园区级综合能源系统是综合能源应用中一个典型场景,考虑到系统中的可再生能源具有能量转化效率低的特点,分别采用能效比和一次能源利用率评价可再生能源系统和化石能源系统的性能,再以供能量占比作为权重反映该系统在整个能源系统的相对重要性,计算出园区级综合能源的加权能源利用率。通过算例对比分析了所提指标与传统一次能源利用率和?效率指标的区别,结果表明,该指标的评价结果能够反映系统的可再生能源消纳水平,体现低碳、高效的核心特征,对于指导系统节能降耗具有重要意义。

To accurately assess the overall performance of integrated energy systems,with a focus on their key characteristics of low carbon emissions and high efficiency,and to facilitate the safe integration of renewable energy,this study proposes a weighted energy utilization efficiency index.The integrated energy system in industrial parks is identified as a typical scenario for the application of comprehensive energy.Considering the relatively low energy conversion efficiency of renewable sources in these systems,the study evaluates the performance of the renewable and fossil fuel energy systems using energy efficiency ratios and primary energy utilization rates.Moreover,the proportion of supplied energy is utilized as a weighting factor to indicate the system’s relative significance within the total energy framework,leading to the calculation of the weighted energy utilization efficiency for the park’s integrated energy system.Through comparative analysis with conventional metrics such as primary energy utilization rate and exergy efficiency,the results indicate that the proposed index can effectively reflect the level of renewable energy integration,showcasing the system’s core features of low carbon and high efficiency.This is crucial for directing strategies towards energy saving and consumption reduction.