ABSTRACT
This chapter investigates a time delay controller and its application to control a bioprocess. A bioprocess is a time-varying, nonlinear, undermodeled multivariable system. Hence designing a bioprocess controller is not an easy task. Instead, a time delay controller is expected to work satisfactorily for bioprocess control because it can take care of the effects of uncertainty and the undermodeling during the control operation of the process. The chapter describes application of time delay control (TDC). It also describes the detailed development of a full-order observer compatible with TDC. The difference between TDC and other controllers is that time delay controller has provision for incorporating un-modeled parts of the system dynamics and unforeseen disturbances, in addition to controlling nonlinearity. The chapter presents the results and discussion of the simulation experimentation. The performance of conventional proportional integral (PI) and proportional, integral, and derivative (PID) controllers has been compared to that of time delay controller.
