Modeling and Control of a Stoker Firing System

Studenteropgave: Speciale (inkl. HD afgangsprojekt)

  • Heine Hansen
  • Louis Schultz Lantow
This report concerns the controlling of a stoker firing system from Benekov/Liagro. The stoker firing system is set at our/the University's disposal by Techno-Matic A/S who normally delivers the controllers to Benekov/Liagro. Two non-linear models of the stoker firing system are derived; one for wood pellets and one for wheat. The non-linear models are based on six first order differential equations which are determined by thermodynamics and laws of physics. The two non-linear models are then verified in \simulink{} with measured data from the plant. The models are linearized using a first order Taylor series so a controller can be designed. The controller is designed from a state space model of the stoker firing system. This state space model is a representation of the linear model on matrix form. The controller designed for the stoker firing system contains two optimal controllers, based on linear quadratic regulator theory - one for each solid fuel. Moreover the controller contains a solid fuel estimator capable of determine the solid fuel combusted. The solid fuel estimator is designed from the two models, Kalman filters and Bayers possibility rule. The three parts of the controller are verified individually in simulations with satisfying results and they are therefore tested on the plant. The simulation of the two optimal controllers is done using the non-linear model as the plant. The performance obtained in simulations is however not reached on the plant therefore the controllers does not fulfill the desired requirements. The three parts are then assembled to one adaptive controller. This controller is then tested on the plant. Due to lack of time resources has it not been possible to obtain a satisfying result for the adaptive controller.
Antal sider150
Udgivende institutionInstitut for elektroniske systemer
ID: 14421422