The Method Of State Reconstruction Of Thermal Nonlinear System And Several Theoretical Issues

With the continuous increasement of grid capacity,the control requirement has also been constantly enhanced.In practical application,because some state variables cannot be measured directly or the measuring equipments is restricted for the economy,it is difficult for the physical achievement of state feedback to do.However, state feedback is irreplaceable on performance,in order to solve this problem,people begin to use the state reconstruction to replace the true state of the system to achieve the state feedback requested.State reconstruction is proposed against this background. The designing of the state observer is both theoretical significance and valuable of application.The ordinary observer can not satisfy the need of control because the real world is non-linear.And the controlled object of thermal control field has the dynamic characteristics such as large inertia and hysteresis.Therefore,the simple PID control has been far from meeting the needs of practice.The state feedback based on the Increment Function Observer(short for IFO-K△x) is proved to be feasible and effective by a great number of practice.The observer applied in the engineering project in the practical application is usually algebra equivalent observer,it is an important concept brought by ununique state of linear system.This paper based on IFO-K△x links with the actual application of high-order inertial algebra equivalent observer of the actual project and gives the simple calculation method of conversion matrix in the different transfer functions.Finally, the general form of corresponding conversion matrix is obtained.The accuracy of conversion matrix is ensured by examination,which offers an effective way for revealing the intrinsic relationship of algebra equivalent observer.