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Arctan Power–Frequency Droop for Improved Microgrid Stability

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5 Author(s)
Rowe, C.N. ; Sch. of Electr. Eng. & Comput. Sci., Univ. of Newcastle, Newcastle, NSW, Australia ; Summers, T.J. ; Betz, R.E. ; Cornforth, D.J.
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The term microgrid is usually reserved for a modest sized, local distributed generation network that will largely operate standalone (i.e., without a grid connection.) The most common power flow control method utilized in a standalone microgrid is a technique known as power-frequency droop. This paper introduces the concept of utilizing an arctan function for the power-frequency droop profile. The use of this arctan function improves the small signal stability of the two-inverter microgrid, provides natural frequency bounding, and is flexible in its application. SABER simulations are performed to obtain the operating points about which the system is linearized for the stability analysis. Experimental results obtained from a dSPACE-controlled, low-voltage, two-inverter hardware system are presented to verify the theoretical and simulation results.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 8 )

Date of Publication:

Aug. 2013

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