Transmission-Distribution Coordination Flexibility Solution for Renewable Energy Integration into Power Grids: An Integrated Flexibility Market

Tao Jiang, Zhongwei Shen, Xiaolong Jin, Rufeng Zhang, Alessandra Parisio, Xue Li, Xiao Kou

Research output: Contribution to journalArticlepeer-review


Nowadays, transmission system operators (TSOs) encounter the challenges of securely operating the power grids with high penetration of renewables. In this context, more flexibility is needed than ever to maintain system reliability. With the rapid development of coordinated transmission and distribution technology recently, the active distribution networks (ADNs) which have abundant flexible resources have the potential to provide flexibility to the TSO. Hence, an integrated transmission-distribution flexibility market is proposed in this paper. In the proposed framework, the energy market is first cleared to obtain the baseline generation schedules. Then the baseline generation schedules are treated as the inputs to the flexibility market. Furthermore, the integrated flexibility market is cleared to facilitate the flexibility trading between the transmission and the distribution networks. To preserve the data privacy of different market participants, an alternating direction method of multipliers (ADMM) -based method is utilized to clear the markets in a distributed manner. In the energy market and flexibility market-clearing model, the transmission networkmarket clearing models are linear programming (LP) models, and the distribution network market clearing models are second order cone programming (SOCP) models. Through the proposed method, only limited information is exchanged between TSO and DSOs. Case studies are conducted on the revised IEEE 30-bus transmission network with two 33-node ADNs. Numerical results demonstrate that the proposed flexibility market framework can enhance the competitiveness of the generation companies in the transmission network and the distributed generators (DGs) in the ADNs. Moreover, the flexibility purchasing cost is reduced by 17.7% compared to the traditional flexibility supplied by generators according to the case study results, and ADNs can gain additional flexibility profit by providing flexibility.
Original languageEnglish
JournalCSEE Journal of Power and Energy Systems
Publication statusAccepted/In press - 6 Sept 2022


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