Investigation of Maximum Possible OPF Problem Decomposition Degree for Decentralized Energy Markets

The need for improved utilization of existing system assets and energy sources, as well as the smooth incorporation of new technologies (such as electric vehicles) into the grid, has prompted the participation of small power consumers and generators in the energy markets. A problem of such scale however cannot be managed in a centralized manner in its full detail. This paper examines the idea of a decentralized approach in clearing the energy market. A general framework for the problem decomposition and its distributed solution is presented and analyzed. A key point of interest in this work is the fundamental question of how far decomposition may be pursued for a given system, while still achieving reasonable convergence properties. The corresponding optimization problem is formulated and solved through a parallel implementation of the Alternating Direction Method of Multipliers (ADMM). A thorough investigation of its convergence properties is conducted, and through its coordination with an additional proximal based decomposition method we improve its scalability characteristics

Investigation of spinning reserve impact on isolated systems DC interconnection feasibility

Summarization: This paper investigates the optimal size of a potential DC interconnection between an isolated island system and the mainland grid. Adequate spinning reserve is perhaps the most prominent security requirement in isolated systems. Thus this paper focuses specifically on how the optimal interconnection solution is affected by spinning reserve (SR) requirements and cost. A Monte-Carlo based probabilistic load flow is used to assess the benefits of each interconnection scenario. Indicative results are presented regarding a possible submarine interconnection of the Greek island of Crete with the mainland grid.Παρουσιάστηκε στο: IEEE International Conference on Environment and Electrical Engineerin