Eigenvalue analysis of microgrids using linearization and system identification techniques

In this paper the dynamic behavior of a microgrid is investigated using eigenanalysis and system identification techniques. A detailed nonlinear model of the microgrid is developed in Matlab/Simulink and is used to obtain a linearized approximation to perform eigenanalysis. Moreover, the system eigenvalues are also analyzed by applying a system identification technique on the dynamic responses. The results from both methods are compared and evaluated. A microgrid with rotating and inverter-interfaced units is studied and results for various operating scenarios, such as changes in the synchronous generators torque, load changes and changes in the inverters setpoints, are presented. The influence of each parameter change on the system eigenvalues is highlighted.

[1]  J. F. Hauer,et al.  Application of Prony analysis to the determination of modal content and equivalent models for measured power system response , 1991 .

[2]  M.R. Iravani,et al.  Power Management Strategies for a Microgrid With Multiple Distributed Generation Units , 2006, IEEE Transactions on Power Systems.

[3]  P.W. Lehn,et al.  Micro-grid autonomous operation during and subsequent to islanding process , 2005, IEEE Transactions on Power Delivery.

[4]  J. V. Milanovic,et al.  Dynamic equivalent model of Distribution Network Cell using Prony analysis and Nonlinear least square optimization , 2009, 2009 IEEE Bucharest PowerTech.

[5]  N. Hatziargyriou,et al.  Making microgrids work , 2008, IEEE Power and Energy Magazine.

[6]  M. Kayikci,et al.  Transient Responses of Distribution Network Cell with Renewable Generation , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[7]  F. Katiraei,et al.  Small-signal dynamic model of a micro-grid including conventional and electronically interfaced distributed resources , 2007 .

[8]  Reza Iravani,et al.  Voltage-Sourced Converters in Power Systems: Modeling, Control, and Applications , 2010 .

[9]  Lingling Fan,et al.  Investigation of Microgrids With Both Inverter Interfaced and Direct AC-Connected Distributed Energy Resources , 2011, IEEE Transactions on Power Delivery.

[10]  Theofilos A. Papadopoulos,et al.  Integration of smart grid technologies in a MicroGrid with PV and FC units , 2012 .

[11]  Reza Iravani,et al.  Voltage-Sourced Converters in Power Systems: Modeling, Control, and Applications , 2010 .