Power Oscillations Damping in DC Microgrids

This paper proposes a new control strategy for damping of power oscillations in a multisource dc microgrid. A parallel combination of a fuel cell (FC), a photovoltaic system, and a supercapacitor (SC) is used as a hybrid power conversion system (HPCS). The SC compensates for the slow transient respo...

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Bibliographic Details
Published inIEEE transactions on energy conversion Vol. 31; no. 3; pp. 970 - 980
Main Authors Hamzeh, Mohsen, Ghafouri, Mohsen, Karimi, Houshang, Sheshyekani, Keyhan, Guerrero, Josep M.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Control systems
Damping
DC microgrid
droop control
dynamic response
Dynamical systems
Dynamics
Electric power grids
Gain
Impedance
Microgrids
Oscillations
Oscillators
Parameters
Robust stability
small signal analysis
Supercapacitors
virtual impedance loop
Voltage control
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Summary:This paper proposes a new control strategy for damping of power oscillations in a multisource dc microgrid. A parallel combination of a fuel cell (FC), a photovoltaic system, and a supercapacitor (SC) is used as a hybrid power conversion system (HPCS). The SC compensates for the slow transient response of the FC stack. The HPCS controller comprises a multiloop voltage controller and a virtual impedance loop for power management. The virtual impedance loop uses a dynamic droop gain to actively damp the low-frequency oscillations of the power sharing control unit. The gain of the virtual impedance loop is determined using a small-signal analysis and the pole placement method. The Mesh analysis is employed to further study the stability of low-frequency modes of the overall dc microgrid. Moreover, based on the guardian map theorem, a robust stability analysis is carried out to determine a robustness margin for the closed-loop system. The main advantage of the proposed method is its robustness against uncertainties imposed by microgrid parameters. This feature provides DG units with plug-and-play capability without needing the exact values of microgrid parameters. The performance of the proposed control scheme is verified using hardware-in-the-loop simulations carried out in OPAL-RT technologies.
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ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2016.2542266