access icon free Robustness-oriented distributed cooperative control for ac microgrids under complex environments

© The Institution of Engineering and Technology
Received 06/07/2018, Accepted 20/03/2019, Revised 09/01/2019, Published 29/03/2019

In this study, the power sharing problem of ac microgrids with massive penetration of photovoltaic generators (PVG) is addressed. A robust distributed cooperative control strategy is proposed to control multiple PVGs in ac microgrids under a complex environment (e.g. subject to transmission time delays and noise disturbances). The existing distributed control strategies have been commonly designed assuming ideal communication among PVGs. However, due to inherent communication delays and environmental noises, the real-life practical channels are affected by time delay and additive noise leading each PVG to receive measurements of the states of its neighbours. Thus, the proposed distributed cooperative control strategy will achieve the accurate power sharing property among PVGs through a sparse communication network subject to time delays and noise disturbances. The theoretical concepts and necessary conditions for stability and robust performance of the proposed distributed cooperative control strategy are outlined by the Lyapunov functional method and stochastic differential equation theory. Furthermore, the proposed control strategy is fully implemented and thus satisfies the plug-and-play feature of the future smart grid. Simulation results on an islanded microgrid test system are provided to reveal the effectiveness of the proposed control method to provide accurate proportional power sharing in the MATLAB/SimPowerSystems Toolbox.

Inspec keywords: Lyapunov methods; smart power grids; power generation control; distributed control; voltage control; robust control; differential equations; distributed power generation; power distribution faults; photovoltaic power systems

Other keywords: ac microgrids; complex environment; noise disturbances; transmission time delays; existing distributed control strategies; control multiple PVGs; control strategy; control method; accurate proportional power sharing; sparse communication network subject; inherent communication delays; accurate power sharing property; time delay; islanded microgrid test system; additive noise; environmental noises; PVG; robustness-oriented; power sharing problem

Subjects: Voltage control; Distributed power generation; Stability in control theory; Solar power stations and photovoltaic power systems; Multivariable control systems; Control of electric power systems; Distribution networks

References

    1. 1)
      • 17. Liu, S., Liu, P.X., El Saddik, A.: ‘Modeling and stability analysis of automatic generation control over cognitive radio networks in smart grids’, IEEE Trans. Syst. Man Cybern. Syst., 2015, 45, (2), pp. 223–234.
    2. 2)
      • 10. Liang, H., Choi, B.J., Zhuang, W., et al: ‘Stability enhancement of decentralized inverter control through wireless communications in microgrids’, IEEE Trans. Smart Grid, 2013, 4, (1), pp. 321–331.
    3. 3)
      • 19. Coelho, E.A., Wu, D., Guerrero, J.M., et al: ‘Small-signal analysis of the microgrid secondary control considering a communication time delay’, IEEE Trans. Ind. Electron, 2016, 63, (10), pp. 6257–6269.
    4. 4)
      • 11. Lu, X., Yu, X., Lai, J., et al: ‘A novel distributed secondary coordination control approach for islanded microgrids’, IEEE Trans. Smart Grid, 2018, 9, (4), pp. 2726–2740.
    5. 5)
      • 27. Lu, X., Austin, F., Chen, S.: ‘Flocking in multi-agent systems with active virtual leader and time-varying delays coupling’, Commun. Nonlinear Sci. Numer. Simul., 2011, 16, pp. 1014–1026.
    6. 6)
      • 1. Yazdanian, M., Mehrizi-Sani, A.: ‘Distributed control techniques in microgrids’, IEEE Trans. Smart Grid, 2014, 5, (6), pp. 2091–2909.
    7. 7)
      • 18. Lai, J., Zhou, H., Lu, X., et al: ‘Droop-based distributed cooperative control for microgrids with time-varying delays’, IEEE Trans. Smart Grid, 2016, 7, (4), pp. 1775–1789.
    8. 8)
      • 6. Zhong, Q.C.: ‘Robust droop controller for accurate proportional load sharing among inverters operated in parallel’, IEEE Trans. Ind. Electron., 2013, 60, (4), pp. 1281–1290.
    9. 9)
      • 28. Hu, J., Feng, G.: ‘Distributed tracking control of leader-follower multi-agent systems under noisy measurement’, Automatica, 2010, 46, (8), pp. 1382–1387.
    10. 10)
      • 20. Lai, J., Zhou, H., Lu, X., et al: ‘Distributed power control for DERs based on networked multiagent systems with communication delays’, Neurocomputing, 2016, 179, pp. 135–143.
    11. 11)
      • 2. Yang, Q., Barria, J.A., Green, T.C.: ‘Communication infrastructures for distributed control of power distribution networks’, IEEE Trans. Ind. Inf., 2011, 7, (2), pp. 316–327.
    12. 12)
      • 5. 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. 158–172.
    13. 13)
      • 12. Islam, S., Agarwal, S., Shyam, A.B., et al: ‘Ideal current-based distributed control to compensate line impedance in DC microgrid’, IET Power Electronics, 2018, 11, (7), pp. 1178–1186.
    14. 14)
      • 9. Liu, W., Gu, W., Sheng, W.X., et al: ‘Pinning-based distributed cooperative control for autonomous microgrids under uncertain communication topologies’, IEEE Trans. Power Syst., 2016, 31, (2), pp. 1320–1329.
    15. 15)
      • 23. Ahumada, C., Cárdenas, R., Sáez, D.: ‘Secondary control strategies for frequency restoration in islanded microgrids with consideration of communication delays’, IEEE Trans. Smart Grid, 2016, 7, (3), pp. 1430–1441.
    16. 16)
      • 16. Das, N., Ma, W., Islam, S.: ‘Analysis of end-to-end delay characteristics for various packets in IEC 61850 substation communications system’. 2015 Australasian Universities In Power Engineering Conf. (AUPEC), Wollongong, Australia, 2015, pp. 1–5.
    17. 17)
      • 15. Das, N., Aung, T.T., Islam, S.: ‘Process-to-bay level peer-to-peer network delay in IEC 61850 substation communication systems’. 2013 Australasian Universities In Power Engineering Conf. (AUPEC), Wollongong, Australia, 2013, pp. 1–6.
    18. 18)
      • 8. Xin, H., Qu, Z., Seuss, J., et al: ‘A self-organizing strategy for power flow control of photovoltaic generators in a distribution network’, IEEE Trans. Power Syst., 2011, 26, (3), pp. 1462–1473.
    19. 19)
      • 26. Dou, C., Yue, D., Guerrero, J.M., et al: ‘Multiagent system-based distributed coordinated control for radial DC microgrid considering transmission time delays’, IEEE Trans. Smart Grid, 2017, 8, (5), pp. 2370–2381.
    20. 20)
      • 22. Liu, S., Wang, X., Liu, P.X.: ‘Impact of communication delays on secondary frequency control in an islanded microgrid’, IEEE Trans. Ind. Electrion., 2015, 62, (4), pp. 2021–2031.
    21. 21)
      • 24. Lu, X., Chen, N., Wang, Y., et al: ‘Distributed impulsive control for islanded microgrids with variable communication delays’, IET Control Theory Appl., 2016, 10, (14), pp. 1732–1739.
    22. 22)
      • 14. Wen, S., Yu, X., Zeng, Z., et al: ‘Event-triggering load frequency control for multi-area power systems with communication delays’, IEEE Trans. Ind. Electron., 2016, 63, (2), pp. 1308–1317.
    23. 23)
      • 21. Aghanoori, N., Masoum, M.A., Islam, S., et al: ‘Investigation of microgrid instability caused by time delay’. 2017 10th Int. Conf. on Electrical and Electronics Engineering (ELECO), Bursa, Turkey, 2017, pp. 105–110.
    24. 24)
      • 7. Han, Y., Zhang, K., Li, H., et al: ‘MAS-based distributed coordinated control and optimization in microgrid and microgrid clusters: a comprehensive overview’, IEEE Trans. Power Electron., 2018, 33, (8), pp. 6488–6508.
    25. 25)
      • 4. Lu, X., Yu, X., Lai, J., et al: ‘Distributed secondary voltage and frequency control for islanded microgrids with uncertain communication links’, IEEE Trans. Ind. Inf., 2017, 13, (2), pp. 448–460.
    26. 26)
      • 13. Simpson-Porco, J.W., Shafiee, Q., Dörfler, F.: , et al ‘Secondary frequency and voltage control of islanded microgrids via distributed averaging’, IEEE Trans. Ind. Electron, 2015, 62, (11), pp. 7025–7038.
    27. 27)
      • 3. Mohamed, Y., El-Saadany, E.F.: ‘Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids’, IEEE Trans. Power Electron., 2008, 23, (6), pp. 2806–2816.
    28. 28)
      • 25. Chen, G., Guo, Z.: ‘Distributed secondary and optimal active power sharing control for islanded microgrids with communication delays’, IEEE Trans. Smart Grid, DOI: 10.1109/TSG.2017.2785811.
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