Abstract:

In order to reduce carbon emissions and improve economic benefits, a grid-connected distributed integrated energy system coupling gas-fired internal combustion engine, rooftop photovoltaics and ground source heat pump was proposed to realize the coordinated supply of regional cooling, heating, power and steam based on the resource endowment and load demand characteristics of the park. With the objective of minimizing the carbon dioxide emissions, annual cost and average power purchase fluctuation, the capacity allocation planning and day-ahead operation dispatch of the system were carried out through the established optimization model. Taking an industrial park in Xi’an as the study case, the optimal capacities under each single objective and multi-objective optimization were obtained based on the load data throughout the year. According to the comprehensive planning results, the annual performance was calculated, and the typical days of heating period and cooling period were selected for dispatch research. The sensitivity analysis was made for the fluctuations of photovoltaics installation, electricity price and gas price, and the corresponding energy storage capacities and system performance changes were determined. The results indicated that the environmental performance and stability of the distributed integrated energy system could be significantly improved under the premise of meeting the demand, and the annual cost was the most sensitive to the changes of electricity price and gas price.

Key words: integration, renewable energy, optimal design, operation dispatch, distributed energy system

摘要：

为降低碳排放水平、提高经济效益，基于园区资源禀赋与负荷需求特性，提出了一种天然气内燃机耦合屋顶光伏与地源热泵的并网型分布式综合能源系统，实现区域级冷、热、电、蒸汽协同供应。以二氧化碳排放量、费用年值、年均购电波动最小化为目标建立优化模型，对系统进行供能设备容量配置规划与日前运行调度。以西安市某工业园区为案例，基于全时负荷数据获得各单一目标及多目标优化下的最佳容量。根据综合目标规划结果得到全年性能，并选取供热季与供冷季的典型日进行调度研究。针对光伏装机、电价、气价的波动作敏感性分析，确定对应储能规模及性能变化。结果表明：在满足需求的前提下，分布式综合能源系统的环保性、稳定性均明显提升，费用年值对电价和气价的变化最为敏感。

关键词: 集成, 再生能源, 优化设计, 运行调度, 分布式能源系统