Energy storage requirements for inverter-based microgrids under droop control in d-q coordinates

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Department of Mechanical Engineering-Engineering Mechanics; Department of Electrical and Computer Engineering


This work proposes a novel distributed control approach for Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) method to determine Energy Storage (ES) requirements for a three-phase, inverter-based Microgrids (MGs). Here, local system references are obtained through a primary d-q droop control which is supported by a level-zero Hamiltonian controller. ES devices are the actuators of the system to enforce reference points. The control approach as well as power flow and energy transfer model of the MG enables the ES capacity and bandwidth to be obtained. As a result, a zero-output ES element analysis is defined which can further be used to study storage requirements versus additional constraints. Communication network update-rate can affect Energy Storage Systems (ESSs) and filtering requirements. The developed analysis is demonstrated in parallel and looped nine-bus WSCC reduced-order MG system examples to obtain ES requirements versus communication network update-rate and (bandwidth).

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IEEE Transactions on Energy Conversion