Design and implementation of communication network for modular microgrid based power park

Power Park comprised of multiple modular microgrids exhibits advantages including: better control flexibility, higher scalability, higher reliability, etc. The energy management system (EMS) of the Power Park can be divided into three layers, namely, converter layer, microgrid module layer and Power Park layer. In order to realize system control objectives in different layers, Beaglebone Black (BBB) is implemented for both microgrid module controller and Power Park Controller. BBB is a low-power open-source hardware single-board computer. Different control algorithms are implemented in each layer to realize respective control objectives. In converter layer control, converter controllers are scheduled to operate based on local information to realize systematic coordination in distributed control. In microgrid module layer, BBB coordinates various converters based on the Field-Area Network (FAN) communication. Functions like secondary voltage/frequency regulation, contingency analysis, etc. are executed to enhance control accuracy within the module. In Power Park layer, Park-Area Network (PAN) is implemented for communication between the central controller and multiple module controllers. Unit Commitment (UC), Economic Dispatch (ED) and Optimal Power Flow (OPF) are executed to schedule the coordination among modules as well as power exchange with utility grid to realize economic optimization.