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Optimal LQR-based multi-loop linear control strategy for UPS inverter applications using resonant controller
, Article Proceedings of the IEEE Conference on Decision and Control, 12 December 2011 through 15 December 2011, Orlando, FL ; 2011 , Pages 3080-3085 ; 01912216 (ISSN) ; 9781612848006 (ISBN) ; Edrington, C. S ; Maghsoudlou, B ; Mokhtari, H ; Sharif University of Technology
2011
Abstract
This paper presents an optimal multi-loop control structure for uninterruptible power supply (UPS) applications which use voltage source inverter (VSI) coupled with LC filter. A resonant controller ensures tracking of sinusoidal voltage reference and rejection of sinusoidal current disturbance with no steady-state error if the loop remains stable. The challenges are reduction of output total harmonic distortion (THD), improving damping of the LC resonance frequency and preventing generation of fast closed-loop modes which go beyond the frequency range of inverter with limited switching frequency. An extension of the classic linear quadratic regulator (LQR) is proposed which addresses the...
Towards the optimal tracking interval management for target tracking wireless sensor networks
, Article ATC 2009 - Proceedings of the 2009 International Conference on Advanced Technologies for Communications, 12 October 2009 through 14 October 2009 ; 2009 , Pages 161-166 ; 9781424451395 (ISBN) ; Abolhassani, B ; Abdizadeh, M ; Sharif University of Technology
Abstract
We consider the minimization of power consumption in target tracking wireless sensor networks (WSNs) using dynamic modification of tracking interval. In this context, we first analyze the performance of such networks, using a quantitative mathematical analysis. Then we calculate an upper bound for the achievable improvement in total power consumption, when using an adaptive time interval modification algorithm for tracking moving objects with acceleration. Towards this optimum functionality, we propose a novel adaptive algorithm (AHC) to adapt the tracking interval such that it minimizes power consumption while keeping an acceptable accuracy. Simulation results show that using the proposed...
Three Dimensional Multi-Objective Terrain Following/Avoidance Optimization Using Heuristic Approach
, M.Sc. Thesis Sharif University of Technology ; Pourtakdoust, Hossein (Supervisor)
Abstract
Thus far, there has been a great attraction toward the optimal flight path planning problem. Terrain following/avoidance (TF/TA) flight is one of the most significant applications of this issue. To prevent from detection by the radars, fighter aircrafts, cruise missiles and helicopters often have to fly as close as possible to the surface during the operations. Such types of maneuvers are much more demanding and effortful than to be designed and implemented by human. The optimal TF/TA guidance system design comprises three phases: optimal path planning, closed-loop control system design for trajectory tracking and sensor blending to match the onboard and measured terrain data. So far, the...
Optimal tuning of linear controllers for power electronics/power systems applications
, Article Electric Power Systems Research ; Volume 81, Issue 12 , 2011 , Pages 2188-2197 ; 03787796 (ISSN) ; Edrington, C. S ; Mokhtari, H ; Sharif University of Technology
2011
Abstract
This paper presents a new method for tuning various linear controllers such as Proportional-Integral (PI), Proportional-Integral-Derivative (PID) and Proportional-Resonant (PR) structures which are frequently used in power electronics and power system applications. The linear controllers maintain a general structure defined by the Internal Model Principle (IMP) of control theory. The proposed method in this paper is twofold. The first perspective uses the well-known concept of the Linear Quadratic Regulator (LQR) to address the problem as a regulation problem. The Q matrix of the LQR design is then finely adjusted in order to assure the desired transient response for the system. The second...
Forward dynamics simulation of human walking employing an iterative feedback tuning approach
, Article Proceedings of the Institution of Mechanical Engineers. Part I: Journal of Systems and Control Engineering ; Volume 223, Issue 3 , 2009 , Pages 289-297 ; 09596518 (ISSN) ; Meghdari, A ; Vossoughi, G. R ; Sharif University of Technology
2009
Abstract
Inverse dynamics analysis as well as the generation of an optimal goal oriented human motion both lead to the problem of finding suitable activations of the redundant muscles involved. This paper employs an iterative feedback tuning approach to perform the forward dynamics simulation of the human musculoskeletal system during level walking. A modified form of the proportional-integral-derivative (PID) controller is proposed to stabilize the movement and provide tracking of problems of the desired lower extremity joint profiles. Controller parameters were determined iteratively using an optimization algorithm to minimize tracking errors during forward dynamics simulation. Static optimization...