Tao LIU

Assistant Professor
Department of Electrical and Electronic Engineering
The University of Hong Kong
Office: Room 517, Chow Yei Ching Building
Tel: (+852) 3917 4577
Email: taoliu@eee.hku.hk

Experiences

Assistant Professor

The University of Hong Kong, Hong Kong S.A.R.
May 2019 - Present

Research Assistant Professor

The University of Hong Kong, Hong Kong S.A.R.
Jul 2015 - Apr 2019

Postdoctoral Fellow

The University of Hong Kong, Hong Kong S.A.R.
Sep 2013 - Jun 2015

Postdoctoral Fellow

The University of Groningen, The Netherlands
Jun 2012 - Aug 2013

Research Fellow

The Australian National University, Australia
Jan 2012 - May 2012

Visiting Scholar

The University of Sydney, Australia
Feb 2012 - May 2012

Educations

Northeastern University, China

B.S.
Automation
2003

Australian National University (ANU), Australia

Ph.D
Control Theory
2011

Research Interestings

  1. Power system analysis and control;
  2. Integration of renewable energy;
  3. Networked microgrid systems;
  4. Complex dynamical networks;
  5. Distributed control;
  6. Event-triggered control;

Grants

  1. Fully Responsive and Non-Disruptive Load-Based Frequency Control (PI)
  2. RGC GRF
    Jan 2017 — Dec 2019

  3. Hierarchical and Distributed Control of Networked Microgrid Systems (PI)
  4. RGC GRF
    Jan 2019 — Dec 2021

  5. Stability Issues for Microgrids (Co-I)
  6. RGC GRF
    Jan 2019 — Dec 2021

Invited Talks

  1. Distributed Frequency Control of Future Grids
  2. Tsinghua University, Beijing, China
    Oct 2019

  3. Power Network Stability: A Graph-Based Approach
  4. Huazhong University of Science and Technology, Wuhan, China
    Dec 2019

  5. Power Network Control: A Graph-Based Approach
  6. Advanced Control and Optimization for Cyber-Physical Energy Systems Workshop in IEEE Conference on Control Technology and Applications
    Aug 2019

  7. Power Network Stability Analysis and Control: A Graph-Based Approach
  8. Hong Kong University of Science and Technology, Hong Kong S.A.R.
    Jan 2017

  9. Distributed Control of Future Power Grids
  10. KTH Royal Institute of Technology, Sweden
    Jun 2016

  11. Distributed Control of Future Power Grids
  12. University of Groningen, The Netherlands
    Jun 2016

  13. Synchronization of Networks by Event-Triggered Control
  14. Hong Kong Polytechnic University, Hong Kong S.A.R.
    Dec 2015

  15. Output Synchronization of Heterogeneous Networks by Distributed Event-Triggered Control
  16. Hong Kong University of Science and Technology, Hong Kong S.A.R.
    May 2015

Selected Publications

Journals

  1. B. Liu, B. Xu and T. Liu, “Almost sure contraction for stochastic switched impulsive systems,” accepted by IEEE Trans. Automatic Control, Dec. 2020.
  2. Y. Song, D.J. Hill and T. Liu, “Network-based analysis of rotor angle stability of power systems”, accepted by Foundations and Trends® in Electric Energy Systems, vol. 4(3), pp. 222-345, 2020.
  3. L. Yang, T. Liu and D.J. Hill, “Decentralized event-triggered frequency regulation for multi-area power systems,” accepted by Automatica, Nov. 2020.
  4. Z. Tang, D.J. Hill and T. Liu, “Distributed coordinated reactive power control for voltage regulation in distribution networks,” accepted by IEEE Trans. Smart Grid, DOI: 10.1109/TSG.2020.3018633, Aug.2020.
  5. T. Sun, T. Liu, and X. Sun, “Stability analysis of cyclic switched linear systems: An average cycle dwell time approach,” Information Sciences, vol. 554, pp. 227-237, 2021.
  6. L. Yang, T. Liu and D.J. Hill, “Distributed MPC-based frequency control for multi-area power systems with energy storage,” Electrical Power Systems Research, vol. 190, pp. 1-7, January 2021 (PSCC 2020).
  7. Y. Song, D.J. Hill and T. Liu, “The optimal admittance matrix problem in DC networks,” Electrical Power Systems Research, vol. 189, pp. 1-8, December 2020 (PSCC 2020).
  8. X. Lyu, Y. Jia, T. Liu and Y. He, “Concurrent optimal re/active power control for wind farms under low-voltage-ride through operation,” IEEE Trans. Power Systems (letter), vol. 35(6), pp. 4956-4959, Nov 2020.
  9. Y. Song, Y. Zheng, T. Liu, S. Lei, and D.J. Hill, “Closure to discussion on ‘A new formulation of distribution network reconfiguration for reducing the voltage volatility induced by distributed generation’,” IEEE Trans. Power Systems, vol. 35(6), pp. 4975-4976, Nov 2020.
  10. S. Du, T. Liu and D.W.C. Ho, “Dynamic event-triggered control for leader-following consensus of multiagent systems,” IEEE Trans. Systems Man and Cybernetics: Systems, vol. 50(9), pp. 3243-3251, September 2020.
  11. B. Liu, M. Yang, T. Liu and D.J. Hill, “Stabilization to exponential input-to-state stability via aperiodic intermittent control” accepted by IEEE Trans. Automatic Control, July 2020.
  12. L. Yang, T. Liu, Z. Tang and D.J. Hill, “Distributed optimal generation and load-side control for frequency regulation in power systems,” accepted by IEEE Trans. Automatic Control, July 2020.
  13. M. Yang, B. Liu, T. Liu and D. Liu, “Uniform synchronization for chaotic systems via event-triggered aperiodic intermittent control,” accepted by Asian Journal Control, July 2020.
  14. L. Yang, T. Liu and D.J. Hill, “Decentralized event-triggered frequency control with guaranteed L-infinity-Gain for multi-area power systems,” IEEE L-CSS, vol. 5(2), pp. 373-378, April 2021.
  15. M. Li, L. Su and T. Liu, “IFP-based distributed optimization with event-triggered communication,” IEEE L-CSS, vol. 5(1), pp. 283-288, Jan. 2021.
  16. Z. Tang, Y. Song, T. Liu and D.J. Hill, “Distributed inter-area oscillation damping control for power systems by using wind generators and load aggregators,” International Journal of Electrical Power and Energy Systems, vol. 123, pp. 1-14, Dec 2020.
  17. Z. Tang, D.J. Hill and T. Liu, “Distributed control of active distribution networks to support voltage control in subtransmission networks,” International Journal of Electrical Power and Energy Systems, vol. 117, pp. 1-9, May 2020.
  18. Y. Song, Y. Zheng, T. Liu, S. Lei, and D.J. Hill, “A new formulation of distribution network reconfiguration for reducing the voltage volatility induced by distributed generation,” IEEE Trans. Power Systems, vol. 35(1), pp. 496-507, Jan. 2020.
  19. Y. Song, D.J. Hill and T. Liu, “On extension of effective resistance with application to graph Laplacian definiteness and power network stability,” IEEE Trans. Circuits and Systems I, vol. 66(11), pp. 4415-4428, July 2019.
  20. Y. Song, D.J. Hill and T. Liu, “Impact of connection topology on the stability of inverter-based microgrids,” IEEE Trans. Power Systems, vol. 34(5), pp. 3970-3972, September 2019.
  21. K. Liu, T. Liu, Z. Tang, and D.J. Hill, “Distributed MPC-based frequency control in networked microgrids with voltage constraints,” IEEE Trans. Smart Grid, vol. 10(6), pp. 6343-6354, November 2019.
  22. Y. Song, D.J. Hill and T. Liu, “Static voltage stability analysis of distribution systems based on network-load admittance ratio,” IEEE Trans. Power Systems, vol. 34(3), pp. 2270-2280, May 2019.
  23. Z. Tang, D.J. Hill and T. Liu, “Fast distributed reactive power control for voltage regulation in distribution networks,” IEEE Trans. on Power Systems, vol. 34(1), pp. 802-803, January 2019.
  24. Y. Song, D.J. Hill and T. Liu, “State-in-mode analysis of the power flow Jacobian for static voltage stability,” International Journal of Electrical Power and Energy Systems, vol. 105, pp. 671-678, Feb. 2019.
  25. C. Zhang, T. Liu and D.J. Hill, “Switched distributed load-side frequency control of power systems,” International Journal of Electrical Power and Energy Systems, vol. 105, pp. 709-716, Feb. 2019.
  26. C. Zhang, T. Liu and D.J. Hill, “Granular load-side frequency control with electric spring aggregators and leader-follower consensus,” IET Generation, Transmission & Distribution, vol. 13(9), pp. 1700-1708, Jun. 2019.
  27. Y. Zheng, D.J. Hill, T. Liu and K. Meng, “Supplementary frequency regulation with multiple virtual energy storage system aggregators,” accepted by Electric Power Components and Systems, Sept 2018.
  28. T. Yang, T. Liu, J. Chen, S. Yan and S.Y.R. Hui, “Dynamic modular modelling of smart loads associated with electric springs and control,” IEEE Trans. Power Electronics, vol. 33(12), pp. 10071-10085, Dec. 2018.
  29. O. Megel, T. Liu, D.J. Hill and G. Andersson, “Distributed secondary frequency control algorithm considering storage efficiency,” IEEE Trans. Smart Grid, vol. 9(6), pp. 6214-6228, Nov. 2018.
  30. Y. Song, D.J. Hill and T. Liu, “Characterization of cutsets in networks with applications to transient stability analysis of power systems,” IEEE Trans. Control of Network Systems, vol. 5(3), pp. 1261-1274, 2018.
  31. Y. Song, D.J. Hill and T. Liu, “Network-based analysis of small-disturbance angle stability of power systems,” IEEE Trans. Control of Network Systems, vol. 5(3), pp. 901-912, 2018.
  32. Z. Tang, D.J. Hill and T. Liu, “A novel consensus-based economic dispatch for microgrids,” IEEE Trans. Smart Grid, vol. 9(4), pp.3920-39212, 2018.
  33. Z. Tang, D.J. Hill, T. Liu and H. Ma, “Hierarchical voltage control of weak subtransmission networks with high penetration of wind power,” IEEE Trans. Power Systems, vol. 33(1), pp. 187-197, 2018.
  34. T. Liu, M. Cao, C. De Persis and J. Hendrickx, “Distributed event-triggered control for asymptotic synchronization of dynamical networks,” Automatica, vol. 86, pp. 199-204, 2017.
  35. Y. Song, D.J. Hill, T. Liu and Y. Zheng, “A distributed framework for stability evaluation and enhancement of inverter-based microgrids,” IEEE Trans. Smart Grid, vol. 8, pp. 3020-3034, 2017 (special issue).
  36. B. Liu, D.J. Hill and T. Liu, “Exponential input-to-state stability under events for hybrid dynamical networks with coupling time-delays,” Journal of the Franklin Institute, vol. 354, pp. 7476-7503, 2017.
  37. Z. Tang, D.J. Hill and T. Liu, “Two-stage voltage control of subtransmission networks with high penetration of wind power,” Control Engineering Practice, vol. 62, pp. 1-10, 2017.
  38. Y. Zheng, D.J. Hill and T. Liu, “Modelling and control for future grids with large renewable energies,” Southern Power System Technology, vol. 11(10), pp. 87-95, 2017.
  39. T. Liu, D.J. Hill and C. Zhang, “Non-disruptive load-side control for frequency regulation in power systems,” IEEE Trans. Smart Grid, vol. 7(4), pp. 2142-2153, 2016 (special issue).
  40. T. Liu, D.J. Hill and J. Zhao, “Output synchronization of dynamical networks with incrementally-dissipative nodes and switching topology,” IEEE Trans. Circuits and Systems I, vol. 62(9), pp. 2312-2323, 2015.
  41. B. Liu, T. Liu and C. Dou, “Stability of discrete-time delayed impulsive linear systems with application to multi-tracking,” International Journal of Control, vol. 87(5), pp. 911-924, 2014.
  42. T. Liu, D.J. Hill and J. Zhao, “Synchronization of dynamical networks by network control,” IEEE Trans. Automatic Control, vol. 57(6), pp. 1574-1580, 2012.
  43. J. Zhao, D.J. Hill and T. Liu, “Global bounded synchronization of general dynamical networks with nonidentical nodes,” IEEE Trans. Automatic Control, vol. 57 (10), pp. 2656-2662, 2012.
  44. J. Zhao, D.J. Hill and T. Liu, “Global Stability of dynamical networks with non-identical nodes: A multiple V-Lyapunov function method,” Automatica, vol. 47, pp. 2615-2625, 2011.
  45. J. Zhao, D.J. Hill and T. Liu, “Synchronization of dynamical networks with non-identical nodes: Criteria and control,” IEEE Trans. Circuits and Systems I, vol. 58(3), pp. 584-594, 2011.
  46. T. Liu, J. Zhao and D.J. Hill, “Exponential synchronization of complex delayed dynamical networks with switching topology,” IEEE Trans. Circuits and Systems I, vol. 57(11), pp. 2967-2980, 2010.
  47. J. Zhao, D.J. Hill and T. Liu, “Synchronization of complex dynamical networks with switching topology: A switched system point of view,” Automatica, vol. 45, pp. 2502-2511, 2009.
  48. T. Liu, J. Zhao and D.J. Hill, “Synchronization of complex delayed dynamical networks with nonlinearly coupled nodes,” Chaos, Solitons and Fractals, vol. 40, pp. 1506-1519, 2009.
  49. T. Liu, G.M. Dimirovski and J. Zhao, “Exponential synchronization of complex delayed dynamical networks with general topology,” Physica A, vol. 387, pp. 643-652, 2008.
  50. T. Liu and J. Zhao, “Synchronization of complex switched delay dynamical networks with simultaneously diagonalizable coupling matrices,” Journal of Control Theory and Applications, vol. 6(4), pp. 351-356, 2008.
  51. X. Chen, T. Liu and J. Zhao, “A logic-based switching control approach to active queue management for transmission control protocol,” International Journal of Innovative Computing, Information and Control, vol. 4(7), pp. 1811-1820, 2008.

Conferences

  1. X. Lyu, Y. Jia and T. Liu, “A revisit towards optimal control modes for AI enabled wind power plants,” ISGT-Europe, 2020.
  2. M. Li, L. Su and T. Liu, “IFP-based distributed optimization with event-triggered communication,” accepted by IEEE Conference on Decision and Control, 2020 (online).
  3. Y. Song, D.J. Hill and T. Liu, “The optimal admittance matrix problem in DC networks,” Power Systems Computation Conference, pp. 1-7, June 2020 (online).
  4. L. Yang, T. Liu and D.J. Hill, “Distributed MPC-based frequency control for multi-area power systems with energy storage,” Power Systems Computation Conference, pp. 1-7, June 2020 (online).
  5. L. Yang, T. Liu and D.J. Hill, “Distributed optimization for multi-time slot economic dispatch,” accepted by IEEE Power & Energy Society General Meeting, 2019, Atlanta, USA.
  6. K. Liu, T. Liu and D.J. Hill, “Decentralized MPC-based frequency control of networked microgrids,” IEEE PES ISGT Asia, May 2019, pp. 1-5, Chengdu, China.
  7. L. Yang, T. Liu and D.J. Hill, “Decentralized periodic event-triggered frequency regulation for multi-area power systems,” Power Systems Computation Conference, pp. 1-7, 2018, Dublin, Ireland.
  8. Z. Tang, T. Liu, C. Zhang, Y. Zheng and D.J. Hill, “Distributed control of active distribution networks for frequency support,” Power Systems Computation Conference, pp. 1-7, 2018, Dublin, Ireland.
  9. M. Li and T. Liu, “Distributed robust resource allocation with convex-concave uncertain objective functions,” Society of Instrument and Control Engineers (SICE) Annual Conference, pp. 1-6, 2018, Nara, Japan.
  10. Y. Song, D.J. Hill and T. Liu, “Local stability of DC microgrids: A perspective of graph Laplacians with self-loops,” IEEE Conference on Decision and Control, pp. 2629-2634, 2017, Melbourne, Australia.
  11. C. Zhang, T. Liu and D.J. Hill, “Granulated load-side control for power systems with electric springs aggregators,” IEEE PES PowerTech, pp. 1-6, 2017, Manchester, UK.
  12. K. Liu, T. Liu and D.J. Hill, “Frequency control in networked microgrids with voltage-sensitive loads,” International Institute of Research and Education in Power System Dynamics (IREP), pp. 1-6, 2017, Espinho, Portugal.
  13. Y. Song, D.J. Hill and T. Liu, “Transient stability analysis of microgrids with a line-based model,” Power Systems Computation Conference, pp. 1-7, 2016, Genoa, Italy.
  14. C. Zhang, T. Liu and D.J. Hill, “Distributed load-side frequency regulation for power systems,” Power Systems Computation Conference, pp. 1-7, 2016, Genoa, Italy.
  15. Z. Tang, D. J. Hill and T. Liu, “Fully distributed voltage control in subtransmission networks via virtual power plants,” IEEE International Conference on Smart Grid Communication, pp. 1-6, 2016, Sydney, Australia.
  16. C. Zhang, T. Liu and D.J. Hill, “Switched distributed load-side frequency regulation for power systems,” IEEE PES General Meeting, pp. 1-5, 2016, Boston, USA.
  17. T. Liu and D.J. Hill, “Event-triggered control for output synchronization of networks with incrementally-dissipative nodes,” Chinese Control Conference, pp. 7955-7960, 2016, Chengdu, China.
  18. B. Liu, D.J. Hill and T. Liu, “Input-to-state-KL*-stability for a class of hybrid dynamical systems,” Chinese Control Conference, pp. 2374-2378, 2016, Chengdu, China.
  19. Y. Song D.J. Hill and T. Liu, “Small-disturbance angle stability analysis of microgrids: A graph theory viewpoint,” IEEE Multi-Conference on Systems and Control, pp. 201-206, 2015, Sydney Australia.
  20. T.S. Borsche, T. Liu and D.J. Hill, “Effects of rotational inertia on power system damping and frequency transients,” IEEE Conference on Decision and Control, pp. 5940-5946, 2015, Osaka, Japan.
  21. Z. Tang, D.J. Hill and T. Liu, “Coordinated voltage control of weak subtransmission networks considering wind power variability,” IFAC symposium on Control of Power and Energy Systems, pp. 1-6, 2015, New Delhi, India.
  22. T. Liu, M. Cao and D.J. Hill, “Distributed event-triggered control for output synchronization of dynamical networks with non-identical nodes,” IEEE Conference on Decision and Control, pp. 3554-3559, 2014, Los Angeles, USA.
  23. T. Liu, D.J. Hill and J. Zhao, “Incremental-dissipativity-based output synchronization of dynamical networks with switching topology,” IEEE Conference on Decision and Control, pp. 4591-4596, 2014, Los Angeles, USA.
  24. T. Liu and M. Cao, “Synchronization of delayed dynamical networks with switching topologies,” IEEE Conference on Decision and Control, pp. 2623-2628, 2013, Florence, Italy.
  25. T. Liu, M. Cao, C. De Persis and J.M. Hendrickx, “Distributed event-triggered control for synchronization of dynamical networks with estimators,” IFAC Workshop on Distributed Estimation and Control in Networked Systems, pp. 116-121, 2013, Koblenz, Germany.
  26. T. Liu, D.J. Hill and B. Liu, “Synchronization of dynamical networks with distributed event-based communication,” IEEE Conference on Decision and Control, pp. 7199-7204, 2012, Maui, USA.
  27. D.J. Hill, T. Liu and G. Verbic, “Smart grids as distributed learning control,” IEEE Power & Energy Society General Meeting, pp. 1-8, 2012, San Diego, USA.
  28. B. Liu, T. Liu and W. Zheng, “Impulsive networked control for discrete-time delayed systems,” IFAC Conference on Analysis and Design of Hybrid Systems, pp. 192-197, 2012, Eindhoven, the Netherlands.
  29. T. Liu, D.J. Hill and J. Zhao, “Incremental-dissipativity-based synchronization of interconnected systems,” IFAC World Congress, pp. 8890-8895, 2011, Milan, Italy.
  30. T. Liu, D.J. Hill and J. Zhao, “Asymptotic stability of dynamical networks,” Chinese Control Conference, pp. 928-933, 2011, Yantai, China.
  31. J. Zhao, D.J. Hill and T. Liu, “Passivity-based output synchronization of dynamical networks with non-identical nodes,” IEEE Conference on Decision and Control, pp. 7351-7356, 2010, Atlanta, USA.
  32. T. Liu, D.J. Hill and J. Zhao, “Global synchronization of dynamical networks with time delay,” IFAC Symposium on Nonlinear Control Systems, pp. 161-166, 2010, Bologna, Italy.
  33. B. Liu, T. Liu and D.J. Hill, “Synchronization of discrete-time CDNs via delayed impulsive control,” IFAC Symposium on Nonlinear Control Systems, pp. 143-148, 2010, Bologna, Italy.
  34. J. Zhao, D.J. Hill and T. Liu, “Global synchronization of dynamical networks with non-identical nodes: a multiple V-Lyapunov function method,” IFAC Symposium on Nonlinear Control Systems, pp. 137-142, 2010, Bologna, Italy.
  35. H. Nie, J. Zhao, G.M. Dimirovski, P. Li, Z. Song and T. Liu, “Delay-dependent H output feedback control for switched systems with time delay,” Chinese Control Conference, pp. 938-943, 2010, Beijing, China.
  36. T. Liu, D.J. Hill and J. Zhao, “Synchronization of dynamical networks by network control,” IEEE Conference on Decision and Control, pp. 1684-1689, 2009, Shanghai, China.
  37. T. Liu, G.M. Dimirovski and J. Zhao, “Controlled synchronization of complex dynamical networks with nonlinear nodes and couplings,” IEEE International Conference on Control Applications, pp. 240-245, 2009, Saint Petersburg, Russia.
  38. D. Ma, G.M. Dimirovski, T. Liu and J. Zhao, “Robust exponential stabilization of switched systems with network time-varying delays and packet dropout,” Chinese Control Conference, pp. 96-100, 2008, Kunming, China.
  39. T. Liu, G.M. Dimirovski and J. Zhao, “Exponential synchronization of complex delayed dynamical networks with general topology,” IEEE Conference on Decision and Control, pp. 2321-2326, 2007, New Orleans, USA.

Teaching

  1. ELEC 8407
  2. Dynamical Power Networks: Modelling and Stability, 1st semester
    2019

  3. ELEC 8408
  4. Dynamical Power Networks: Control and Optimization, 1st semester
    2018

  5. ELEC 8407
  6. Dynamical Power Networks: Modelling and Stability, 1st semester
    2017