Power flow analysis for droop controlled LV hybrid AC-DC microgrids with virtual impedance

The AC-DC hybrid microgrid is an effective form of utilizing different energy resources and the analysis of this system requires a proper power flow algorithm. This paper proposes a suitable power flow algorithm for LV hybrid AC-DC microgrid based on droop control and virtual impedance. Droop and virtual impedance concepts for AC network, DC network and interlinking converter are reviewed so as to model it in the power flow analysis. The validation of the algorithm is verified by comparing it with steady state results from detailed time domain simulation. The effectiveness of the proposed algorithm makes it a potential method for planning, dispatching and operation of droop controlled LV hybrid AC-DC.

[1]  Mohd Wazir Mustafa,et al.  A modified approach for load flow analysis of integrated AC-DC power systems , 2000, 2000 TENCON Proceedings. Intelligent Systems and Technologies for the New Millennium (Cat. No.00CH37119).

[2]  B. R. Oswald,et al.  Modified Newton-Raphson load flow analysis for integrated AC/DC power systems , 2004, 39th International Universities Power Engineering Conference, 2004. UPEC 2004..

[3]  Frede Blaabjerg,et al.  Power flow control of intertied ac microgrids , 2013 .

[4]  Peng Wang,et al.  A Hybrid AC/DC Microgrid and Its Coordination Control , 2011, IEEE Transactions on Smart Grid.

[5]  Reza Iravani,et al.  A Unified Three-Phase Power-Flow Analysis Model For Electronically Coupled Distributed Energy Resources , 2011, IEEE Transactions on Power Delivery.

[6]  Frede Blaabjerg,et al.  Autonomous operation of ac-dc microgrids with minimised interlinking energy flow , 2013 .

[7]  Ehab F. El-Saadany,et al.  A Novel and Generalized Three-Phase Power Flow Algorithm for Islanded Microgrids Using a Newton Trust Region Method , 2013, IEEE Transactions on Power Systems.

[8]  F. Blaabjerg,et al.  Autonomous Control of Interlinking Converter With Energy Storage in Hybrid AC–DC Microgrid , 2013, IEEE Transactions on Industry Applications.

[9]  Ronnie Belmans,et al.  A sequential AC/DC power flow algorithm for networks containing Multi-terminal VSC HVDC systems , 2010, IEEE PES General Meeting.

[10]  M. Elbuluk,et al.  A novel load flow analysis for particle-swarm optimized microgrid power sharing , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).