Microprocessor-Based Suboptimal Control of Converter-Fed Hypo-Hypersynchronous Cascade Drives

Abstract

This work consists of a theoretic and experimental study of a possible practical realization of a microprocessor-based control system using a converter-fed hypo-hypersynchronous cascade drive. Firstly, the design of a microprocessor-based controller is carried out considering an approximate mathematical model, linear-type, of the drive in question, by using optimal control techniques. Several ρhysical constraints, such as input variables con straints, state variables constraints and processing time of microprocessor are taken into account. The approach followed allows us to obtain a suboptimal closed-looρ control system. In addition, in order to carry out a more accurate study of the overall control system, whose objective is both the analysis of certain phenomena which cannot be performed by using an approximate model and the adjustment of the controller parameters, if that is the case, a more accurate mathematical model of the drive has been constructed which takes into account the actual nonlinearities present and allows us to determine the wave forms of the all quantities involved, by digital simulation. The overall control system has been tested by means of simulation experiments. The digital simulation results show the validity of the approach followed.