在全球绿色低碳发展路径下，正在形成可再生能源主导的能源供应结构与电、氢二次能源主导的能源需求结构。考虑能源供需侧的时空分布不均衡问题，电力系统与氢供应链耦合形成的绿色电氢耦合系统可以充分发挥电力传输层面与氢能储存层面优势，提高能源系统在运行、选址定容、规划时间等方面的灵活性，从而提升可再生能源消纳能力，实现电、氢的规模化绿色供应。在此背景下本文围绕绿色电氢耦合系统优化规划进行研究，目前国内外对电氢耦合系统这一对象的研究范围在电力与氢能领域存在明显分界，导致已有研究中对电氢耦合环节电解池建模，以及电氢耦合系统联合规划研究尚不成熟。针对上述问题，本文主要研究工作如下：理论研究。在电解池建模层面，本文提出了自下而上，从电堆到设备、再到集群的建模方法，在上层模型中保留下层灵活性关键参数，建立了电解池设备级与集群级运行模型。模型可对变负载运行工况下电解池在启停、功率、产出三个维度运行灵活性进行准确描述。在电氢耦合系统建模层面，本文对电力系统与氢供应链在物理约束、时间尺度与空间拓扑方面进行差异化建模，在保留电力系统实时平衡与氢供应链能量平衡运行特征前提下，提出统一时间分层离散方法进行多时间尺度耦合建模与模型降维。进一步考虑不确定性，提出适用于电氢耦合系统规划模型形式的分布鲁棒约束简化方法，建立结构化的绿色电氢耦合系统规划模型。该模型适用于不同研究主体，可得出满足典型运行方式要求的经济性最优规划方案。应用研究。本文面向不同研究主体从以下三个维度开展研究：1）电解池选型规划研究。从电力系统的角度面向富余电力消纳问题，发现了在变负载运行工况下电解池选型互补性现象，反映出选型策略需考虑成本、效率、灵活性三方面因素。2）氢供应链选址定容规划研究。从氢供应链的角度面向交通、工业领域绿氢供应问题，发现了在源荷时空分布不均衡下电氢系统容量互补性现象，反映出选址定容需考虑资源质量，以及不同能量传输方式对设备投资成本的影响。3）绿色电氢耦合系统多阶段规划研究。从政府对能源系统的宏观规划研究角度，面向资源开发利用问题，发现考虑不确定性因素下跨区域电氢基础设施规划存在一定的风险互补性现象。综上，本文研究一定程度上打破了电力与氢能领域的研究界限，验证了电氢能量耦合、系统时空耦合的优势，挖掘出互补性现象并得出最优策略结论。

Under the global low-carbon development tendency, the new energy structure dominated by renewable energy on the supply side and electricity and hydrogen on the demand side is gradually formed. Considering the temporal and spatial discrepancies between renewable energy and electricity and hydrogen demand, power-to-hydrogen coupling system can give full play to the complementarity of the advantages of power transmission and hydrogen energy storage compared with their independent operation, which is expected to improve the operational and planning flexibility, and promote the consumption of renewable energy on the energy supply side and achieve the large-scale green electricity and hydrogen supply on the energy demand side. In this context, this paper studies the optimal planning of the green power-to-hydrogen coupling system. At present, the research scope of the power-to-hydrogen coupling system has a clear separation in the field of power system and hydrogen energy, leading to the immature research on the modeling of electrolyzers and the coordinated planning of the whole power-to-hydrogen coupling system. In view of the existing gaps, the major work of this paper is as follows:In terms of the theoretical research, first, on modeling of electrolyzers, this paper proposes a kind of bottom-up approach which is from the stack-level to the equipment-level to the cluster-level, and establishes the operation model of electrolyzers considering variable operation conditions on both equipment-level and cluster-level. The proposed models can describe the operational flexibility from three dimensions of startup-shutdown, power, and hydrogen production. Then, this paper proposes the uniform hierarchical time discretization method to establish the coupling model of power system and hydrogen supply chain, which can reduce the model complexity with retaining the real-time balance constraint of the power system and the energy balance constraint of the hydrogen supply chain. Finally, the uncertainty is further considered based on the distributionally robust method, and the simplification method suitable for the form of the planning model is proposed to improve the computational efficiency. The proposed structured model is suitable for different research subjects and scopes, and the economically optimal planning results which meet the typical operation modes can be obtained. In terms of the application research, this paper conducts research from the following three dimensions for different research subjects: 1) Research on technology selection of electrolyzers. Focusing on the surplus power consumption issue from the perspective of the power system, this study discovers the technology selection complementarity phenomenon in variable conditions: the selection should weigh the three factors of cost, efficiency, and flexibility. 2) Research on siting and sizing of the hydrogen supply chain. Focusing on the green hydrogen supply issue from the perspective of the hydrogen supply chain, this study discovers the capacity complementarity phenomenon in case of the spatio-temporal imbalance of sources and demand. Therefore, the siting and sizing need to weigh the quality of resources, the cost of different energy transmission methods, and their impact on equipment investment costs. 3) Research on multistage planning of green power-to-hydrogen coupling system. From the perspective of the government responsible for the macro-planning of the energy system, this study reveals the risk complementarity phenomenon in the cross-regional electricity and hydrogen infrastructure planning considering the uncertainty.To some extent, this paper breaks the research boundary between the power system and the hydrogen supply chain, verifies the advantages of the power-to-hydrogen coupling, and discovers the core phenomenons and optimal strategy conclusions with a certain reference value.