Joint Expansion Planning of Energy Storage and Transmission Considering Power System Flexibility

doi:10.11930/j.issn.1004-9649.202007062

Abstract

Abstract: 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 high-penetration 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.

Key words: high penetration renewable energy, BESS, capacity allocation, flexibility, joint planning of energy storage and transmission

LI Jiaming, LI Wenqi, LU Zongxiang, QIAO Ying, GAO Dongxue, LIU Shaolin. Joint Expansion Planning of Energy Storage and Transmission Considering Power System Flexibility[J]. Electric Power, 2021, 54(4): 158-167.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202007062

https://www.electricpower.com.cn/EN/Y2021/V54/I4/158

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