In the pursuit of achieving carbon neutrality, it is essential to advance the broad accommodation of renewable energy for the realization of a low-carbon district heating system (DHS). The heat storage configuration serves as an effective assurance for facilitating the accommodation of renewable energy in DHS. This paper analyzes the impact of heat storage configuration on the accommodation of solar energy in DHS, employing a granularity analysis method. This study proposes an optimization method for determining the maximum solar energy accommodation rate in solar-assisted DHSs using the granularity analysis method. Furthermore, this study optimizes the heat storage capacity configuration to facilitate varying ratios of solar energy accommodation. Finally, a technical-economic analysis of the solar-assisted DHS is performed in the context of rising energy cost. The case study reveals that greater granularity leads to a higher solar energy accommodation rate. Specifically, when the granularity increases from 0.43% to 22.22%, the solar energy accommodation rate increases by 8.01%. Moreover, the heat storage capacity configuration increases with the increase of the solar energy accommodation rate, while the heat storage capacity required to accommodate per unit of solar energy decreases. Additionally, as the granularity increases from 0.43% to 22.22%, the heat storage capacity configuration under the same solar energy accommodation ratio increases gradually. This study explores the potential of granularity-based heat storage configuration optimization in promoting solar energy accommodation and achieving the economy of DHS, which is of great significance for the decarbonization of DHS.

中文翻译：

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基于粒度分析的区域供热系统中太阳能调节蓄热配置研究

为了实现碳中和，必须推动可再生能源的广泛应用，以实现低碳区域供热系统（DHS）。储热配置是促进国土安全局可再生能源消纳的有效保障。本文采用粒度分析方法，分析了蓄热配置对DHS太阳能容纳的影响。本研究提出了一种利用粒度分析方法确定太阳能辅助 DHS 中最大太阳能容纳率的优化方法。此外，本研究优化了储热能力配置，以促进不同比例的太阳能容纳。最后，在能源成本上升的背景下对太阳能辅助 DHS 进行了技术经济分析。案例研究表明，粒度越大，太阳能容纳率越高。具体来说，当粒度从0.43%增加到22.22%时，太阳能容纳率增加8.01%。而且，储热容量配置随着太阳能容纳率的增加而增加，而每单位太阳能容纳所需的储热容量则减少。另外，随着粒度从0.43%增加到22.22%，相同太阳能容纳比例下的蓄热能力配置逐渐增加。本研究探讨了基于粒度的储热配置优化在促进太阳能消纳和实现DHS经济性方面的潜力，对于DHS的脱碳具有重要意义。