随着全球气候变化和环境污染问题的加剧，构建清洁能源供应体系和推动能源绿色转型已成为国际社会的共识。我国作为能源消费大国，正在积极稳妥推进“双碳”目标，而作为碳排放主要来源之一的电力行业，其低碳转型尤为关键。本文通过建立火电机组运行碳排放强度模型和多类型低碳能源发电、电化学储能的碳排放源清单，形成了统一的电源侧碳足迹核算模型，并在此基础上提出了适应“源网荷储”灵活互动的新型电力系统低碳运行模拟方法和区域间碳转移量计算方法，实现了对电力系统源侧运行碳排放的模拟与计算，以我国典型送、受端电网为例，开展了互联电网的碳排放量化评估与分析。研究结果表明：通过跨区域整合电力资源，送、受端双区电网全年总运行碳排放量降低0.4%，新能源利用率提升1.4个百分点；以碳排放最小为目标优化电源运行方式后，送、受端电网全年总运行碳排放量分别降低7.8%、11.2%，优于以新能源消纳最大为目标的优化方法。本研究为电力系统的节能减排和低碳运行提供了科学的量化评估手段，为电力行业的低碳转型提供了可操作的实现手段与技术支撑。

With the intensification of global climate change and environmental pollution, building a clean energy supply system and promoting green energy transformation have become a consensus of the international community. As a major energy consumer, China is actively and steadily advancing its carbon peaking and carbon neutrality goals. The low-carbon transformation of the power industry, one of the main sources of carbon emissions, is particularly critical. By establishing a carbon emission intensity model for thermal power unit operations and a carbon emission source inventory for multiple types of low-carbon energy generation and electrochemical energy storage, a unified carbon footprint accounting model for the power supply side was formed. On this basis, a low-carbon operation simulation method for new power systems that is adapted to the flexible interaction of sources, grids, loads, and storage was proposed along with a calculation method for inter-regional carbon transfer, enabling the simulation and calculation of carbon emissions from the source-side operation of power systems. Taking typical power grids in sending and receiving regions in China as examples, quantitative assessment and analysis of carbon emissions in interconnected power grids was carried out. The research results show that through cross-regional integration of power resources, the total annual operating carbon emissions of the power grids in sending and receiving regions decreased by 0.4%, and the utilization rate of renewable energy increased by 1.4%. After optimizing the power supply operation mode with the goal of minimizing carbon emissions, the total annual operating carbon emissions of the power grids in sending and receiving regions decreased by 7.8% and 11.2%, respectively, which is superior to an optimization method with the goal of maximizing renewable energy consumption.This study provides quantitative assessment tools for energy conservation, emission reduction, and low-carbon operation of power systems, and offers operable implementation methods and technical support for the low-carbon transformation of the power industry.