Linear Control Systems

This article presents and describes the new LinearSystems and Controller libraries which are developed to enhance analysis, design and simulation of linear control systems in Modelica. The LinearSystems library contains basic functions for linear system analysis and controller design for state-space, transfer-function, and zeros-and-poles representation. The library utilizes the operator overloading technique from Modelica 3.1. The Controller library provides input/output blocks for these basic system descriptions and allows to quickly switch between a continuous and a discrete representation.