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A Control Strategy for a Distributed Power Generation Microgrid Application With Voltage- and Current-Controlled Source Converter

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2 Author(s)
Serban, E. ; Renewable Energies Bus., Schneider Electr.''s, Burnaby, BC, Canada ; Serban, H.

This paper presents a pseudodroop control structure integrated within a microgrid system through distributed power generation (DPG) modules capable to function in off-grid islanded, genset-connected, and grid-connected modes of operation. System efficiency has an important role in order to harvest the maximum available renewable energy from dc or ac sources while providing power backup capability. A control strategy is proposed in off-grid islanded mode method based on the microgrid line-frequency control as agent of communication for energy control between the DPG modules. A critical case is where the ac load demand could be lower than the available power from the photovoltaic solar array, where the battery bank can be overcharged with unrecoverable damage consequences. The DPG voltage-forming module controls the battery charge algorithm with a frequency-generator function, and the DPG current source module controls its output current through a frequency-detection function. The physical installation between DPG modules is independent, since no additional communication wiring is needed between power modules, which represent another integration advantage within the microgrid-type application.

Published in:

Power Electronics, IEEE Transactions on  (Volume:25 ,  Issue: 12 )