A Distributed Power Sharing Approach for Islanded Microgrids Tuan V. Hoang and Hong-Hee Lee 2019/07/15

Abstract

This paper presents a distributed control scheme to accurately share active, reactive, and selected harmonic power demands for islanded droop-controlled microgrids. The proposed strategy requires only a sparse communication network because the DG unit uses local and its neighbours’ information to carry out the control algorithm. In the proposed strategy, virtual impedances at selected dominant frequencies are adaptively regulated based on the consensus algorithm, and the power sharing errors in the islanded microgrid system is eliminated irrespective of load conditions. The proposed method can be implemented directly in practice without any information such as the feeder impedances or the detailed microgrid configuration. The simulation results are also provided to validate the feasibility and effectiveness of the proposed method.

Authors and affiliations

Tuan V. Hoang and Hong-Hee Lee
School of Electrical Engineering. University of Ulsan, Korea

Key words

Droop control, distributed generation (DG), microgrid, distributed power sharing.

References

[1] A. Mehrizi-Sani and R. Iravani, “Potential-function based control of a microgrid in islanded and grid-connected modes,” IEEE Trans. Power Syst., vol. 25, no. 4, pp. 1883–1891, 2010.
[2] J. M. Guerrero, J. Matas, L. G. D. V. De Vicuna, M. Castilla, and J. Miret, “Wireless-Control Strategy for Parallel Operation of Distributed-Generation Inverters,” IEEE Trans. Ind. Electron., vol. 53, no. 5, pp. 1461–1470, Oct. 2006.
[3] K. De Brabandere, B. Bolsens, J. Van den Keybus, A. Woyte, J. Driesen, and R. Belmans, “A Voltage and Frequency Droop Control Method for Parallel Inverters,” IEEE Trans. Power Electron., vol. 22, no. 4, pp. 1107–1115, Jul. 2007.
[4] J. C. Vasquez, R. A. Mastromauro, J. M. Guerrero, and M. Liserre, “Voltage support provided by a droop-controlled multifunctional inverter,” IEEE Trans. Ind. Electron., vol. 56, no. 11, pp. 4510–4519, 2009.
[5] J. He and Y. W. Li, “Analysis, design, and implementation of virtual impedance for power electronics interfaced distributed generation,” IEEE Trans. Ind. Appl., vol. 47, no. 6, pp. 2525–2538, 2011.
[6] H. Han, Y. Liu, Y. Sun, M. Su, and J. M. Guerrero, “An Improved Droop Control Strategy for Reactive Power Sharing in Islanded Microgrid,” IEEE Trans. Power Electron., vol. 30, no. 6, pp. 3133–3141, Jun. 2015.
[7] J. He, Y. W. Li, and F. Blaabjerg, “An Enhanced Islanding Microgrid Reactive Power, Imbalance Power, and Harmonic Power Sharing Scheme,” IEEE Trans. Power Electron., vol. 30, no. 6, pp. 3389–3401, Jun. 2015.
[8] P. Sreekumar and V. Khadkikar, “A new virtual harmonic impedance scheme for harmonic power sharing in an islanded microgrid,” in 2016 IEEE Power and Energy Society General Meeting (PESGM), 2016, p. 1.
[9] P. Sreekumar and V. Khadkikar, “Direct Control of the Inverter Impedance to Achieve Controllable Harmonic Sharing in the Islanded Microgrid,” IEEE Trans. Ind. Electron., vol. 64, no. 1, pp. 827–837, Jan. 2017.
[10] T. V. Hoang and H. H. Lee, “An Adaptive Virtual Impedance Control Scheme to Eliminate the Reactive-Power-Sharing Errors in an Islanding Meshed Microgrid,” IEEE J. Emerg. Sel. Top. Power Electron., vol. 6, no. 2, pp. 966–976, 2018.
[11] H. Mahmood, D. Michaelson, and J. Jiang, “Accurate Reactive Power Sharing in an Islanded Microgrid Using Adaptive Virtual Impedances,” IEEE Trans. Power Electron., vol. 30, no. 3, pp. 1605–1617, Mar. 2015.
[12] T. V Hoang and H. Lee, “Accurate Power Sharing with Harmonic Power for Islanded Multibus Microgrids,” IEEE J. Emerg. Sel. Top. Power Electron., p. 1, 2018.
[13] H. Moussa et al., “Harmonic Power Sharing With Voltage Distortion Compensation of Droop Controlled Islanded Microgrids,” IEEE Trans. Smart Grid, vol. 9, no. 5, pp. 5335–5347, 2018.
[14] Y. Han, H. Li, P. Shen, E. A. A. Coelho, and J. M. Guerrero, “Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids,” IEEE Trans. Power Electron., vol. 32, no. 3, pp. 2427–2451, Mar. 2017.
[15] J. W. Simpson-Porco, Q. Shafiee, F. Dörfler, J. C. Vasquez, J. M. Guerrero, and F. Bullo, “Secondary Frequency and Voltage Control of Islanded Microgrids via Distributed Averaging,” IEEE Trans. Ind. Electron., vol. 62, no. 11, pp. 7025–7038, Nov. 2015.
[16] J. Schiffer, T. Seel, J. Raisch, and T. Sezi, “Voltage Stability and Reactive Power Sharing in Inverter-Based Microgrids With Consensus-Based Distributed Voltage Control,” IEEE Trans. Control Syst. Technol., vol. 24, no. 1, pp. 96–109, Jan. 2016.
[17] Q. Shafiee et al., “A Multi-Functional Fully Distributed Control Framework for AC Microgrids,” IEEE Trans. Smart Grid, vol. 9, no. 4, pp. 3247–3258, 2018.
[18] J. Zhou, S. Kim, H. Zhang, and Q. Sun, “Consensus-Based Distributed Control for Accurate Reactive , Harmonic , and Imbalance Power Sharing in Microgrids,” IEEE Trans. Smart Grid, vol. 9, no. 4, pp. 2453–2467, 2018.
[19] R. Olfati-Saber and R. M. Murray, “Consensus problems in networks of agents with switching topology and time-delays,” IEEE Trans. Automat. Contr., vol. 49, no. 9, pp. 1520–1533, Sep. 2004.
[20] P. Rodriguez, A. Luna, I. Candela, R. Mujal, R. Teodorescu, and F. Blaabjerg, “Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions,” IEEE Trans. Ind. Electron., vol. 58, no. 1, pp. 127–138, Jan. 2011.