PROJECT TITLE :

A Decentralized Control Strategy for Economic Operation of Autonomous AC, DC and Hybrid AC/DC Micro grids - 2017

ABSTRACT:

Economic operation is a major concern for microgrids (MGs). System operation cost is optimized when the incremental prices (ICs) of all distributed generators (DGs) reach equality. Conventionally, economic dispatch of DGs is solved by centralized management with optimization algorithms or distributed management with consensus algorithms. To improve the reliability, scalability, and economy of MGs, a absolutely decentralized economic power sharing strategy is proposed in this paper. As frequency could be a global state in ac MG and dc bus voltage is a natural indicator in dc MG, a frequency-IC droop scheme is proposed for ac MG, a voltage-IC droop scheme is proposed for dc MG, and a normalization theme is proposed for hybrid ac/dc MG. By using the proposed technique, ICs of DGs reach equality with the convergence of the system world indicator (frequency or dc bus voltage). Then power sharing of every DG is automatically achieved based on its relevant IC function and the whole operating cost will be optimized while not any communication or central controllers. The proposed approach is implemented in an ac MG, a dc MG, and a hybrid ac/dc MG in MATLAB/Simulink to verify its effectiveness.