考虑系统灵活性的储能-输电线路扩展联合规划

强随机波动性的高比例风光电源接入及输送网络规划需要兼顾电力电量平衡和灵活性平衡，经典的输电线路扩展难以满足要求，储能-输电联合规划成为新的解决方案。建立基于灵活性定量评估的储能与输电线路扩展联合优化规划方法。首先，从灵活性角度分析“储-输”联合规划在兼顾电力电量平衡和灵活调节能力上的技术特点和优势；然后，建立考虑灵活性的“储-输”联合规划模型，并提出启发式与数学规划相结合的求解方法；最后，基于改进的Garver-6算例系统进行算法验证，结果表明：在高比例可再生能源场景下，“储-输”联合规划具备更好的经济性；储能有效改善了系统的上调灵活性，但成本是制约其规划容量扩大的重要因素。

Joint Expansion Planning of Energy Storage and Transmission ConsideringPower System Flexibility

In order to accommodate high-penetration wind&PV power sources with strong fluctuation and randomness,the access of renewables and planning of transmission grids not only need to consider the balance of electricity,but also the balance of flexibility capacity.On this occasion,the conventional method of transmission expansion cannot economically realize the above-said objectives,thus joint expansion planning of energy storage and transmission becomes the new solution.A joint expansion planning method for energy storage and transmission based on quantitative assessment of flexibility is established.Firstly,from the perspective of flexibility,we qualitatively analyze the technical characteristics and advantages of the joint‘storage-transmission’planning in power balance and flexible adjustment capacity.Then,a joint storage-transmission planning model considering flexibility is established,and the solution method is given with combination of heuristic and mathematical programming.Finally,the feasibility of the proposed method is verified based on the modified Garver-6 system.The results show that under the scenario of highpenetration of renewable energy sources,the joint‘storage-transmission’planning has better economy.The energy storage can effectively improve the system’s up-regulation flexibility,but the cost is an important factor for restricting its planning capacity.