Distributed optimal operation of hierarchically controlled microgrids

Distributed optimal operation of hierarchically controlled microgrids

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The hierarchical control structure is widely investigated for a microgrid. Conventionally, the tertiary control layer and the primary and secondary control layers are studied independently since they are separated in time scale. It is difficult for distributed generation (DG) units to directly track the optimal power references provided by the tertiary control because they are controlled to behave as voltage sources by the primary and secondary controls. Moreover, even if the DG unit can realise power tracking, improper coordination among the primary, secondary and tertiary controls may still lead to instability of the microgrid. To fill the gap among the three control layers, this study proposes a method for realising their distributed joint operation. With the proposed method, DG units can track the optimal power references in a distributed manner. Regarding the stability issues, this study also presents (i) a detailed stability analysis of the system based on the constructed small-signal dynamic model and (ii) an adaptive regulation strategy of control parameters for enhancing the system stability. Finally, numerical studies and time-domain simulation results are provided to validate the proposed method's ability to realise a distributed optimal and stable operation for a hierarchically controlled microgrid.


    1. 1)
      • 1. Lopes, J.P., Moreira, C., Madureira, A.: ‘Defining control strategies for microgrids islanded operation’, IEEE Trans. Power Syst., 2006, 21, (2), pp. 916924.
    2. 2)
      • 2. Piagi, P., Lasseter, R.H.: ‘Autonomous control of microgrids’. IEEE Power Engineering Society General Meeting, Montreal, QB, Canada, June 2006, pp. 18.
    3. 3)
      • 3. Guo, W., Mu, L.: ‘Control principles of micro-source inverters used in microgrid’, Prot. Control Mod. Power Syst., 2016, 1, (1), pp. 17.
    4. 4)
      • 4. Guerrero, J.M., Vasquez, J.C., Matas, J., et al: ‘Hierarchical control of droop-controlled ac and dc microgrids – a general approach toward standardization’, IEEE Trans. Ind. Electron., 2011, 58, (1), pp. 158172.
    5. 5)
      • 5. Bidram, A., Davoudi, A., Lewis, F.L.: ‘A multiobjective distributed control framework for islanded ac microgrids’, IEEE Trans. Ind. Inf., 2014, 10, (3), pp. 17851798.
    6. 6)
      • 6. Bidram, A., Davoudi, A., Lewis, F.L., et al: ‘Secondary control of microgrids based on distributed cooperative control of multi-agent systems’, IET Gener. Transm. Distrib., 2013, 7, (8), pp. 822831.
    7. 7)
      • 7. Simpson Porco, J.W., Shafiee, Q., Dorfler, F., et al: ‘Secondary frequency and voltage control of islanded microgrids via distributed averaging’, IEEE Trans. Ind. Electron., 2015, 62, (11), pp. 70257038.
    8. 8)
      • 8. Schiffer, J., Seel, T., Raisch, J., et al: ‘Voltage stability and reactive power sharing in inverter-based microgrids with consensus-based distributed voltage control’, IEEE Trans. Control Syst. Technol., 2016, 24, (1), pp. 96109.
    9. 9)
      • 9. Chen, G., Feng, E.: ‘Distributed secondary control and optimal power sharing in microgrids’, IEEE/CAA J. Autom. Sin., 2015, 2, (3), pp. 304312.
    10. 10)
      • 10. Chen, G., Lewis, F.L., Feng, E.N., et al: ‘Distributed optimal active power control of multiple generation systems’, IEEE Trans. Ind. Electron., 2015, 62, (11), pp. 70797090.
    11. 11)
      • 11. Xu, Y., Li, Z.: ‘Distributed optimal resource management based on the consensus algorithm in a microgrid’, IEEE Trans. Ind. Electron., 2015, 62, (4), pp. 25842592.
    12. 12)
      • 12. Liu, Y., Qu, Z., Xin, H., et al: ‘Distributed real-time optimal power flow control in smart grid’, IEEE Trans. Power Syst., 2017, 32, (5), pp. 34033414.
    13. 13)
      • 13. Wang, Z., Wu, W., Zhang, B.: ‘A fully distributed power dispatch method for fast frequency recovery and minimal generation cost in autonomous microgrids’, IEEE Trans. Smart Grid, 2016, 7, (1), pp. 1931.
    14. 14)
      • 14. Xu, Y., Zhang, W., Liu, W., et al: ‘Distributed subgradient-based coordination of multiple renewable generators in a microgrid’, IEEE Trans. Power Syst., 2014, 29, (1), pp. 2333.
    15. 15)
      • 15. Dall'Anese, E., Zhu, H., Giannakis, G.B.: ‘Distributed optimal power flow for smart microgrids’, IEEE Trans. Smart Grid, 2013, 4, (3), pp. 14641475.
    16. 16)
      • 16. Zheng, W., Wu, W., Zhang, B., et al: ‘A fully distributed reactive power optimization and control method for active distribution networks’, IEEE Trans. Smart Grid, 2016, 7, (2), pp. 10211033.
    17. 17)
      • 17. Moazami Goodarzi, H., Kazemi, M.H.: ‘A novel optimal control method for islanded microgrids based on droop control using the ICA-GA algorithm’, Energies, 2017, 10, (4), p. 485.
    18. 18)
      • 18. Yang, X., Du, Y., Su, J., et al: ‘An optimal secondary voltage control strategy for an islanded multibus microgrid’, IEEE J. Emerging Sel. Topics Power Electron., 2016, 4, (4), pp. 12361246.
    19. 19)
      • 19. Farivar, M., Low, S.H.: ‘Branch flow model: relaxations and convexification – part I’, IEEE Trans. Power Syst., 2013, 28, (3), pp. 25542564.
    20. 20)
      • 20. Boyd, S., Parikh, N., Chu, E., et al: ‘Distributed optimization and statistical learning via the alternating direction method of multipliers’, Found. Trends Mach. Learn., 2011, 3, (1), pp. 1122.
    21. 21)
      • 21. Pogaku, N., Prodanović, M., Green, T.C.: ‘Modeling, analysis and testing of autonomous operation of an inverter-based microgrid’, IEEE Trans. Power Electron., 2007, 22, (2), pp. 613625.
    22. 22)
      • 22. Wu, X., Shen, C., Iravani, R.: ‘A distributed, cooperative frequency and voltage control for microgrids’, IEEE Trans. Smart Grid, 2018, 9, (4), pp. 27642776.
    23. 23)
      • 23. Wu, X., Shen, C.: ‘Distributed optimal control for stability enhancement of microgrids with multiple distributed generators’, IEEE Trans. Power Syst., 2017, 32, (5), pp. 40454059.
    24. 24)
      • 24. Wu, X., Shen, C., Iravani, R.: ‘Feasible range and optimal value of the virtual impedance for droop-based control of microgrids’, IEEE Trans. Smart Grid, 2017, 8, (3), pp. 12421251.

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