Suppressing oscillations in processes such as gas turbine combustion
AssigneeUnited Technologies Corporation
InventorsAndrzej Banaszuk, Youping Zhang, Clas A. Jacobson, Miroslav Krstic
Life of this patent
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Abstract
A frequency tracking extended Kalman filter (35), responsive to combustor pressure (30), produces in-phase (36) and quadrature (37) components of the estimated magnitude of the undesirable combustor pressure variations, for which compensation is to be achieved; a bidirectional minimum-seeking algorithm (41) is used to select the phase (42) of a process adjusting input variable (28), such as fuel that is in addition to the main fuel flow used for power control purposes.
Claims11
A method of minimizing the magnitude of a parameter of a dynamic process, the magnitude of said parameter being (a) responsive to a process adjusting input variable applied to said process and (b) varying essentially sinusoidally with time, said method comprising:
- (A) measuring said parameter and providing a parameter signal indicative thereof;
- (B) applying said parameter signal to an observer to provide signals indicative of the in-phase and quadrature components and magnitude of said parameter signal;
- (C) providing, in response to said in-phase, quadrature and magnitude signals, a phase signal indicative of the phase of said process adjusting input variable required to reduce the magnitude of said parameter;
- (D) providing a control signal as a function of said in-phase and quadrature signals and said phase signal to control said process adjusting input variable;
- and
- (E) controlling said process adjusting input variable as a function of said control signal.
Dependencies are inferred from the claim text.