Desired Dynamic Equation Based PID Control for Combustion Vibration

Abstract

Lean Premixed Pre-vaporized technology aiming at reducing nitrogen oxide emission has an inherent drawback of causing combustion instability. Model-based active controller design to suppress the unstable combustion needs the open-loop transfer function of the object which is difficult to acquire and often with inaccuracies in many ways. Desired dynamic equation based PID (DDE-PID) is a model free control strategy which requires little knowledge of the object process, and also has the advantage of limited number of parameter variables to be tuned and simplicity of tuning method. A certain DDE-PID controller is designed and a set of parameter tuning method is given and tested on a open loop transfer function obtained from real experimental data fitting. With nonlinear features like input amplitude limiting and output limiting to resemble the actual system, the simulation results are compared with two model based control strategies which has been tested in actual system and proved to be feasible. The result shows DDE-PID could achieve similar control effect with structural simplicity and tuning easiness.