Powers & Controls

Power and control Research Group of GIKI conducts research in the field of power, optimization and control in fundamental as well as applied side.  Optimization in control refers to reducing some cost function. The cost function for optimal control can be derived using Pontryagin’s maximum principle, or by solving the Hamilton–Jacobi–Bellman equation. Linear Quadratic Regulator is a simplified form of Hamilton-Jacobi-Bellman equation that represents the cost function in the form of quadratic term. H^∞ Loop-shaping is another way of optimizing a cost function, also a part of this Research Group. These optimization techniques are then applied in Micro-electro-mechanical-systems (micro-grippers) and Power Circuits like “efficient topologies in DC-DC converters”.

• Optimization and Control
• Linear Quadratic Regulator (LQR)
• Adaptive Control
• Dead-Time Processes
• Control of Micro-Electro-Mechanical-Systems
• Robust Control System Design for Multivariable Systems
• DC-DC Power convertors

Members

Faculty

• Dr. Nisar Ahmed, Associate Professor.
• Dr. Muhammad Faisal Khan, Assistant Professor.
• Mr. Rameez Hayat, Research Associate.

Graduate Students

• Raheel Quraishi (PhD Candidate).
• Muhammad Adil (MS Candidate).
• Muhammad Ahsan Saeed (MS Candidate).
• Mujahid (MS Candidate).
• Ahmad Rashid (MS Candidate).
• Muhammad Ahsan Saeed (MS Candidate).
• Mujahid (MS Candidate). 
• Arshad Ali (MS Candidate).Arshad Ali (MS Candidate).

MS thesis (completed)

• Constraint Optimization of PI/PID Controller Including Dead-Time Processes.
• Interface Electronics and Control of Electro-statically Actuated MEMS Micro-Gripper.
• Low Pass Closed-Loop Direct Adaptive Inverse Control.
• Model order Approximation of Large-Scale Descriptor Systems Using Implicit Restart Technique.
• Low Rank Approximate Solution of Algebraic Lyapunov and Riccati Equations Using Implicit Restart Scheme.
• Intelligent Autopilot Design for Beaver Vehicle.

Research Publications

Books:
         • Muhammad Abid, Kh.S.Karimov. “Micro-hydropower systems”. ISBN: 978-3-639-23336-0, VDM Verlag Dr. Müller Aktiengesellschaft & Co. KG.

           Germany, 2010.
         • Kh.S.Karimov, Kh.M.Akhmedov. “Micro-hydropower engineering”. ISBN: 978-99947-38-57-1, Donish, Dushanbe, Tajikistan, 2010.(In Russian).
 

(a) Refereed International Conference Papers:

• N. Ahmed and M. Mansoor Ahmed, “Approximation of Large Scale Systems by Implicit Restart Model Reduction Technique,” Proc. 7th International Symposium on Advanced Materials, Islamabad, Pakistan, 2001, pp. 494-502.
• M. M. Ahmed and N. Ahmed, “Estimated AC Response of an Epitaxially Grown GaAs MESFET,” Proc. 7th International Symposium on Advanced Materials, Islamabad, Pakistan, 2001, pp. 391-397.
• N. Ahmed and M. Mansoor Ahmed, “Model Reduction of Large Scale Systems for State Space Realization,” Proc. 7th International Symposium on Advanced Materials, Islamabad, Pakistan, 2001, pp. 514-520.
• N. Ahmed and M. M. Awais “Application of Oblique Projection Krylov Subspace Method for Large Scale Model Reduction”, Proceedings of the 2001 IEEE International Multi-topic Conference       (INMIC), Lahore, Pakistan, pp. 124-130.
• M. M. Ahmed, N. Ahmed, K. S. Chaudhary and M. F. Iqbal, “Estimation of Intrinsic Small Signal Parameters of a GaAs MESFET from DC Measurements,” Proceedings of the 2001 IEEE International Multi-topic Conference       (INMIC), Lahore, Pakistan, pp. 97-103.
• N. Ahmed and M. M. Awais “Implicit Restart Scheme for Large Scale Krylov Subspace Model Reduction Method,” Proceedings of the 2001 IEEE International Multi-topic Conference       (INMIC), Lahore, Pakistan, pp. 131-138.
• Awais, M. M., Shamail, S., Ahmed, N., and Shahid, S. “A New Intelligent Approach Towards Solving State Space Models for Fusion Process.” INMIC 2002, Karachi. December 27-28, 2002.
• Fazal-ur-Rehman, N. Ahmed and K. H. Khan “Steering Control of a Rigid Body with Two Torque Actuators “, Proceedings of the 2003 International Bhurban Conference on Applied Sciences and Technology, Bhurban, Pakistan, Volume 2, pp. 573-583.
• Badar ul Islam, N. Ahmed, Daud Bhatti, and Shahid Khan “Designing Fuzzy Controllers For Non-Linear Position Control Problems”, Proceedings of the 2003 International Bhurban Conference on Applied Sciences and Technology, Bhurban, Pakistan, Volume 2, pp. 585-591.
• Laiq Khan, N. Ahmed and Carlos Lozano, “GA Neuro-Fuzzy Damping Control System for UPFC to Enhance Power System Transient Stability”, Proceedings of the 2003 IEEE International Multi-topic Conference       (INMIC), Islamabad, Pakistan, pp. 276-282.
• Mian M.  Awais, S. Shamail, N. Ahmed, and S. Shahid, “ A Comparative Study of Feed Forward Neural Networks and Radial Basis Neural Networks for Modeling Tokamak Fusion Process”, Proceedings of the 2003 IEEE International Multi-topic Conference (INMIC), Islamabad, Pakistan, pp. 334-339.
• Laiq Khan, K. L. Lo and N. Ahmed, “Micro-GA Based Fuzzy Logic Controllers for Coordinated Facts Control”, Proceedings of the 2003 IEEE International Multi-topic Conference (INMIC), Islamabad, Pakistan, pp. 269-275.
• Badar ul Islam, N. Ahmed, Daud Bhatti, and Shahid Khan, “Controller Design Using Fuzzy Logic For a Twin Rotor MIMO System”, Proceedings of the 2003 IEEE International Multi-topic Conference (INMIC), Islamabad, Pakistan, pp. 264-268.
• L. Khan, I. H. Umrani, N. Ahmed, N. D. Gohar, A. Khaliq “Multi-objective Control System Design for Damping Low Frequency Oscillations in Large Power System using Hierarchical Micro GA”, Fourth IBCAST- 2005, Pakistan.
• R.  Quraishi, N. Ahmed, L. Khan and F. Azeem “Lyapunov Equations Approximation Using Implicit Restart Scheme”, IEEE International Conference on Emerging Technologies (ICET) pp.324-329 2006 Pakistan.
• R.  Quraishi, N. Ahmed, L. Khan and F. Azeem “Algebraic Riccati Equation’s Approximation Using Implicit Restart Scheme”, IEEE International Multi-topic Conference (INMIC), pp. 433-437 2006 Pakistan.
• R Quraishi, N Ahmed, L Khan, T Saeed, “Approximation of Large-Scale Algebraic Equations Using Implicit Restart Scheme”, Proceedings IEEE Internation Bhurban Conference on Applied Sciences and Technology, pp.111-116, 2007 Pakistan.
• M. Bilal Saif, S. A. Bazaz, N. Ahmed, “Interface Electronics and Controller for an Electrostatically actuated MEMS based Microgripper”, 13th  IEEE International Multi-topic conference (INMIC), Islamabad Pakistan, pp344- 349 December, 2009.

(b) International Journal Papers:

• N. Ahmed, “Approximation of Large Scale Unstable Systems by the Implicit Restart Techniques”, International Journal for Applied Computational Mathematics, Volume 1, no. 2, pp. 175-189, 2002. (Index by Math. Reviews & ISI)
• G. Shabbir and N. Ahmed, “Proper Affine Vector Fields in Plane Symmetric Static Space-Times” International Journal for Applied Computational Mathematics, Volume 4, no. 1, pp. 75-83, 2005.
• F.U. Rehman and N. Ahmed, “Feedback Stabilization of Nonholonomic Integrator (Brockett’s System)”, International Journal of Modelling and Simulation, ACTA Press Canada, Volume 26, no. 3, pp.244-250, 2006. (Indexed by Cambridge Scientific Abstracts, Compendex (Engineering Information), FIZ Karlsruhe and INSPEC.)
• M. M. Awais, Shafay Shamail and N. Ahmed, “Dimensionally Reduced Krylov Subspace Model Reduction for Large Scale Systems” Applied Mathematics and Computation, Elsevier. Volume 191, no. 1, pp.21-30, 2007.
• F. U. Rehman, M. M. Ahmed and N. Ahmed, “Steering Control Algorithm for Drift Free Control Systems Using Model Decomposition; A Wheeled Mobile Robot of Type (1,1) Example”, International Journal of Robotics and Automation, ACTA Press Canada. Volume 22, no.4, pp. 251-259, 2007. ( ISI Indexed)
• L. Khan, I. H. Umrani and N. Ahmed, “Multi-objective PSSs Design for Damping Intra-Area Oscillations in Multi-Machines Power System Using Hierarchical Micro GA ” Journal of Eng. and Appl. Sci., Volume 27 no.1, pp.1-10 Jan-June 2008.
• G Shabbir and N. Ahmed, “A note on Proper Affine Symmetry in Kantowski-Sachs and Bianchi Type III Space-Times” International Journal of Modern Mathematics, Volume 4 pp.201-209 2009.
• H. M. Usman Sani, Shafaat A. Bazaz, and N. Ahmed “Fabless Prototyping Methodology for the Development of SOI based MEMS Microgripper”, Journal of Engineering & Technology, World Academy of Science,  Issue 64, pp. 492-496, 2010.
• M. Amir Shafiq, M. Shafiq and N. Ahmed, “Closed Loop Direct Adaptive Inverse Control for Linear Plants”, Submitted to “Automatica” 2012, (Paper ID: 2574).