Adaptive control of combustion instability using extremum-seeking

We present results of experiment with two distinct extremum-seeking adaptive algorithms for control of combustion instability suitable for reduction of acoustic pressure oscillations in gas turbine over large range of operating conditions. The algorithms consists of a frequency tracking extended Kalman filter to determine the in-phase component, the quadrature component, and the magnitude of the acoustic mode of interest, and a phase shifting controller with the controller phase tuned using an extremum-seeking algorithms. Even though the algorithms were designed specifically for control of combustion instability in gas turbine engines, they are applicable for control of oscillations of systems whose oscillation frequency and optimal control phase shift depends on operating conditions, and which are driven by strong broad-band disturbance. The algorithms have been tested in combustion experiments involving full-scale engine hardware and during simulated fast engine transients.

[1]  Ann P. Dowling,et al.  PRACTICAL ACTIVE CONTROL-SYSTEM FOR COMBUSTION OSCILLATIONS , 1990 .

[2]  Prashant G. Mehta,et al.  Linear and nonlinear analysis of controlled combustion processes. I. Linear analysis , 1999, Proceedings of the 1999 IEEE International Conference on Control Applications (Cat. No.99CH36328).

[3]  Miroslav Krstic,et al.  Performance improvement and limitations in extremum seeking control , 2000 .

[4]  Y. Neumeier,et al.  Active control of combustion instabilities using real time identification of unstable combustor modes , 1995, Proceedings of International Conference on Control Applications.

[5]  A. Annaswamy,et al.  A Model-Based Active Control Design for Thermoacoustic Instability , 1998 .

[6]  Jeffrey M. Cohen,et al.  Active control of combustion instability in a liquid-fueled low-NOx combustor , 1999 .

[7]  La Scala,et al.  Approaches to frequency tracking and vibration control , 1994 .

[8]  Petros G. Voulgaris,et al.  On optimal ℓ∞ to ℓ∞ filtering , 1995, Autom..

[9]  Joerg R. Seume,et al.  Application of Active Combustion Instability Control to a Heavy Duty Gas Turbine , 1998 .

[10]  Richard M. Murray,et al.  System identification for limit cycling systems: a case study for combustion instabilities , 1998, Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207).

[11]  Jan Sternby,et al.  Extremum control systems¿An area for adaptive control? , 1980 .

[12]  Y. Zhang,et al.  Stability and performance tradeoff with discrete time triangular search minimum seeking , 2000, Proceedings of the 2000 American Control Conference. ACC (IEEE Cat. No.00CH36334).

[13]  A. Peracchio,et al.  Nonlinear heat-release/acoustic model for thermoacoustic instability in lean premixed combustors , 1998 .

[14]  Miroslav Krstic,et al.  Stability of extremum seeking feedback for general nonlinear dynamic systems , 2000, Autom..