Grid-Connected Inverter Experimental Simulation and Droop Control Implementation

Authors: Nur Aisyah Jalalludin, Arwindra Rizqiawan, Goro Fujita

Abstract:

In this study, we aim to demonstrate a microgrid system experimental simulation for an easy understanding of a large-scale microgrid system. This model is required for industrial training and learning environments. However, in order to create an exact representation of a microgrid system, the laboratory-scale system must fulfill the requirements of a grid-connected inverter, in which power values are assigned to the system to cope with the intermittent output from renewable energy sources. Aside from that, during fluctuations in load capacity, the grid-connected system must be able to supply power from the utility grid side and microgrid side in a balanced manner. Therefore, droop control is installed in the inverter’s control board to maintain a balanced power sharing in both sides. This power control in a stand-alone condition and droop control in a grid-connected condition must be implemented in order to maintain a stabilized system. Based on the experimental results, power control and droop control can both be applied in the system by comparing the experimental and reference values.

Keywords: Droop control, droop characteristic, grid-connected inverter, microgrid, power control.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1337549

References:

[1] F. Blaabjerg, R. Teodorescu, M. Liserre, A.V. Timbus, “Overview of Control and Grid Synchronization for Distributed Power Generation Systems,” IEEE Trans. Ind. Electron., vol. 53, no. 5, pp. 1398–1409, Oct. 2006.
[2] B. Kroposki et al., “Making Microgrids Work,” IEEE Power & Energy Magazine, May/June 2008, pp. 40–53.
[3] R. Lasseter et al., “Integration of Distributed Energy Resources: The CERTS MicroGrid Concept,” Lawrence Berkeley National Laboratory, prepared for Transmission Reliability Program and Energy Systems Integration Program, Apr. 2010, pp. 6–19.
[4] N. Hatziargyriou, H. Asano, R. Iravani, C. Marnay, “Microgrids: An Overview of Ongoing Research, Development, and Demonstration Projects,” IEEE Power & Energy Magazine, July/August 2007, pp. 78–94.
[5] J. C. Vasquez, J. M. Guerrero, A. Luna, P. Rodríguez, R. Teodorescu, “Adaptive Droop Control Applied to Voltage-Source Inverters Operating in Grid-Connected and Islanded Modes,” IEEE Trans. Ind. Electron., vol. 56, no. 10, pp. 4088–4096, Oct. 2009.
[6] Prabha Kundur, Power System Stability and Control. U.S.A.: McGraw-Hill Inc., 1994, pp. 67–582.
[7] H. Akagi, E. H. Watanabe, M. Aredes, Instantaneous Power Theory and Applications to Power Conditioning. New Jersey: John Wiley and Sons, Inc., 2007, pp. 43–47.
[8] G. C. Hsieh, J. C. Hung, “Phase-Locked Loop Techniques-A Survey,” IEEE Trans. Ind. Electron., vol. 43, no. 6, pp. 609-615, Dec. 1996.
[9] F. M. Gardner, Phaselock Techniques. New Jersey: John Wiley & Sons, Inc., 2005, pp. 1–3.
[10] M. P. Kazmierkowski, L. Malesani, “Current Control Techniques for Three-Phase Voltage-Source PWM Converters,” IEEE Trans. Ind. Electron., vol. 45, no. 5, pp. 691–703, Oct. 1998.
[11] J. Rocabert, A. Luna, F. Blaabjerg, P. Rodriguez, “Control of Power Converters in AC Microgrids,” IEEE Trans. Power Electronics, vol. 27, no. 11, pp. 4734–4749, Nov. 2012.
[12] P. Arboleya et al., “An improved control scheme based in droop characteristic for microgrid converters,” Electric Power Systems Research 80, pp. 1215–1221, June 2010.
[13] J. Matas, M. Castilla, L. G. Vicu˜na, J. Miret, “Virtual Impedance Loop for Droop-Controlled Single-Phase Parallel Inverters Using a Second-Order General-Integrator Scheme,” IEEE Trans. Power Electronics, vol. 25, no. 12, pp. 2993–3002, Dec. 2010.
[14] K. D. Brabandere, B. Bolsens, J. V. Keybus, A. Woyte, “A Voltage and Frequency Droop Control Method for Parallel Inverters,” IEEE Trans. Power Electronics, vol. 22, no. 4, pp. 1107–1115, July 2007. N.