A Kalman filter for feedback control of rotating external kink instabilities in the presence of noise

Hanson, Jeremy M.; De Bono, Bryan; Levesque, Jeffrey P.; Mauel, Michael E.; Maurer, David A.; Navratil, Gerald A.; Pedersen, Thomas Sunn; Shiraki, Daisuke; James, Royce W.
May 2009
Physics of Plasmas;May2009, Vol. 16 Issue 5, p056112
Academic Journal
The simulation and experimental optimization of a Kalman filter feedback control algorithm for n=1 tokamak external kink modes are reported. In order to achieve the highest plasma pressure limits in ITER, resistive wall mode stabilization is required [T. C. Hender et al., Nucl. Fusion 47, S128 (2007)] and feedback algorithms will need to distinguish the mode from noise due to other magnetohydrodynamic activity. The Kalman filter contains an internal model that captures the dynamics of a rotating, growing n=1 mode. This model is actively compared with real-time measurements to produce an optimal estimate for the mode’s amplitude and phase. On the High Beta Tokamak-Extended Pulse experiment [T. H. Ivers et al., Phys. Plasmas 3, 1926 (1996)], the Kalman filter algorithm is implemented using a set of digital, field-programmable gate array controllers with 10 μs latencies. Signals from an array of 20 poloidal sensor coils are used to measure the n=1 mode, and the feedback control is applied using 40 poloidally and toroidally localized control coils. The feedback system with the Kalman filter is able to suppress the external kink mode over a broad range of phase angles between the sensed mode and applied control field. Scans of filter parameters show good agreement between simulation and experiment, and feedback suppression and excitation of the kink mode are enhanced in experiments when a filter made using optimal parameters from the scans is used.


Related Articles

  • Online linearization-based neural predictive control of air—fuel ratio in SI engines with PID feedback correction scheme. Saraswati, Samir; Chand, Satish // Neural Computing & Applications;Sep2010, Vol. 19 Issue 6, p919 

    Model predictive control (MPC) frequently uses online identification to overcome model mismatch. However, repeated online identification does not suit the real-time controller, due to its heavy computational burden. This work presents a computationally efficient constrained MPC scheme using...

  • Bandwidth Optimization in Centralized WLANs for Different Traffic Types. Haines, R. J.; Fanning, N.; Lewis, T.; Coon, J. // EURASIP Journal on Wireless Communications & Networking;1/6/2007, p1 

    Allocating bandwidth between different forms of coexisting traffic (such as web-browsing, streaming, and telephony) within a wireless LAN is a challenging and interesting problem. Centralized coordination functions in wireless LANs offer several advantages over distributed approaches, having the...

  • A New Adaptive PID and CMAC Controller Based on Multi-parameter Optimization. Ruo-Fa Cheng; Wen-Long Zhao; Hong-Feng Deng; Deng-Feng Peng // Journal of Applied Sciences;2013, Vol. 13 Issue 20, p4114 

    PID and CMAC compound controller was developed about thirty years ago but yet it lacks effective multi-parameter self-tuning method, including parameters of CMAC learning rate and inertia weight. Without proper control parameters, the control system based on PID and CMAC controller will converge...

  • Integrated Structure and Control Design for Servo System Based on Genetic Algorithm and Matlab. Dingzhen Li; Ruimin Jin // Journal of Computers;Sep2011, Vol. 6 Issue 9, p1903 

    The integrated design was introduced about the pitching part of airborne radar servo system. The paper analyzed both the servo system model and the dynamic character of this system. Then the research about parameter optimization and simulation had been done by using the Matlab. The...

  • Optimization Design and Simulation on Structure Parameters of a Haptic Interface. Jintian Yun; Yuanyuan Li; Hongqiang Sang // International Journal of Advancements in Computing Technology;Apr2013, Vol. 5 Issue 8, p92 

    Haptic device is an important component in a master-slave teleoperation. It's both an input device of real-time motion control signals and an output device with force feedback. The parameters' optimization design of the structure is made according to the actual requirement of operating operating...

  • Feedback control of major disruptions in International Thermonuclear Experimental Reactor. Sen, A. K. // Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p082502 

    It is argued that major disruptions in ITER can be avoided by the feedback control of the causative MHD precursors. The sensors will be 2D-arrays of ECE detectors and the suppressors will be modulated ECH beams injected radially to produce non-thermal radial pressures to counter the radial...

  • Nonlinear Adaptive Control of a Two-Vehicle Convoy. Petrov, P. // Open Cybernetics & Systemics Journal;2009, Vol. 3, p70 

    This paper describes the modeling of a two-vehicle convoy and the design of a vehicle following controller that tracks the trajectory of the vehicle ahead with prescribed inter-vehicle distance. Kinematic equations of the system are formulated applying standard robotic methodology. We consider...

  • Control Strategies of Wastewater Treatment Plants. Rahmat, M. F.; Samsudin, S. I.; Wahab, N. A.; Salim, Sy Najib Sy; Gaya, M. S. // Journal of Applied Sciences Research;Aug2011, Vol. 7 Issue 8, p446 

    The objective of the current study is to investigate various control strategies implemented to wastewater treatment plants. The paper starts with discussion in modeling part of wastewater system and continues with designation of control objectives and control parameters. Subsequently, the...

  • Alternative Conceptions of Feedback in Dynamic Decision Environments: An Experimental Investigation. Sengupta, Kishore; Abdel-Hamid, Tarek K. // Management Science;Apr93, Vol. 39 Issue 4, p411 

    Studies conducted in recent years have shown that outcome feedback in dynamic decision-making tasks does not lead to improved performance. This has led researchers to examine alternatives to outcome feedback for improving decision makers' performance in such tasks. This study examines the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics