Prof X Xia (Xiaohua)

(Visit my personal webpages at


Professor, Group Head: Energy Systems


Director, National Hub for Postgraduate Programme in Energy Efficiency and Demand Side Management (EEDSM Hub), supported by SANERI

Postal Address

Prof. Xiaohua Xia
Department of Electrical, Electronic & Computer Engineering
University of Pretoria
Pretoria, 0002
South Africa

Tel. +27 12 420-2165
Fax. +27 12 362-5000
E mail: xxia at postino dot up dot ac dot za

Visiting Address

Engineering 1, 14-7
Main campus
Lynnwood Road 2
South Africa


B.Sc(WIHEE, China)
M.Eng(WIHEE, China)
D.Eng(BUAA, China)

Professional Status

Professional Engineer, Engineering Council of South Africa (ECSA)
Certified Measurement and Verification Professional (CMVP), Energy Valuation Organisation (EVO)
National Research Foundation (NRF) rating: A 


Member of the Association of Energy Engineers (AEE)
Fellow of South African Academy of Engineering (SAAE)
Member of the Academy of Science of South Africa (ASSAf)
Fellow IEEE

Professional Service

  • AE for IEEE Transactions on Automatic Control (2011)
  • AE for Automatica (2000–2009)
  • Specialist Editor (Control), African Research Journal: Research Journal of the South African Institute of Electrical Engineers. (was)
  • AE for IEEE CAS-II (was)
  • Chair, TC on Nonlinear Systems, IFAC (2008-2011)
  • Member, Technical Board, IFAC (2008-2011)
  • Past Chair: South African Control Chapter, IEEE
  • Chair: Association for Promoting Scientific and Technological Cooperation between China and South Africa



Electric Circuits I (EBN120)
Electric Circuits II (EBN210)
Control Systems (EBB320)
Energy Systems (EEM 410)


Linear Multivariable Control (EMB732)
Advanced Research Topics in Energy Research (ERT732)

Research Fields and Topics

Energy optimisation and management, Non-linear feedback control, complex systems, sampled-data feedback control, observer design, modelling and control of HIV/AIDS, heavy haul trains, river/dam network systems, delta-modulated feedback systems, chaotic systems

Observability and observation of nonlinear systems, feedback linearization and decoupling of nonlinear systems, dynamic feedback control of nonlinear systems, output feedback control of nonlinear systems, output regulation of nonlinear systems, sampling and simulation of control systems, identifiability of nonlinear (time-delay) systems, periodic orbits arising from delta-modulation and delta-modulated feedback 

– more recent research topics: 

see my personal research pages at

Research Fellow

J. F. Zhang, June 2006 – December 2008

Y. J. Shen, July 2011- November 2011

Postdoctoral Fellows

B. Z. Guo, October 1998–September 1999, now chair professor at Wits, RSA

A. L. Marquez-Martinez, July 2000–January 2001, now CICESE, Mexico

C. P. Li, February 2004–January 2005, now Shanghai University, China

S. Bowong, March 2006–May 2006, now University of Douala, Cameron

Ahmed Mohamed Ahmed Elaiw, August 2007 – July 2008, from Al-Azhar University, (Assiut), Egypt

X. Liang, January 2009 – August 2009, now Tianjing Polytechnic University, China

S. Zhang, November 2008 – November 2009, from Wuhan University, China

D. Wei, January 2009 – June 2011

Martin Siewe Siewe July 20111- November 2011

Hui Yu, May 2011- April 2012

M. Xiao, September 2012 - August 2013

Z. Wu,

B. Zhu,

Q. Cheng

AM Shehata

O. Dzobo

F. Yang

F. Barzegar

W. Xie


__Publications (sampled) __

*  See: for an updated list or for a relative full list.

[168] C. Kagiri, E. M. Wanjiru, L. Zhang and X. Xia, Optimized response to electricity time-of-use tariff of a compressed natural gas fuelling station, Applied Energy, 222 (2018), 244-256.  

[167] J. Yan, H. Yu and X. Xia, Distributed optimization of multi-agent systems with delayed sampled-data, Neurocomputing, 296 (2018) 100-108.

[166] J. Mei, X. Xia and M. Song, An autonomous hierarchical control for improving indoor comfort and energy efficiency of a direct expansion air conditioning system, Applied Energy, 221 (2018) 450-463.

[165] Y. Fan and X. Xia, Energy-efficiency building retrofit planning for green building compliance, Building and Environment 136 (2018) 312-321.

[164] Z. Wu, K. Zhao and X. Xia, Lighting retrofit and maintenance models with decay and adaptive control, IET Control Theory Appl., 2018, Vol. 12 Iss. 5, pp. 593-600.

[163] Q. Li, Z. Wu and X. Xia, Estimate and characterize PV power at demand-side hybrid system, Applied Energy 218 (2018) 66-77.

[162] H. Carstens, X. Xia and S. Yadavalli, Bayesian energy measurement and verification analysis, Energies 2018, 11, 380; doi:10.3390/en11020380.

[161] H. Carstens, X. Xia, S. Yadavalli, Measurement uncertainty in energy monitoring: Present state of the art, Renewable and Sustainable Energy Reviews 82 (2018) 2791-2805.

[160] E. Wanjiru and X. Xia, Sustainable energy-water management for residential houses with optimal integrated grey and rain water recycling, Journal of Cleaner Production 170 (2018) 1151-1166.

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