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As a part of a research project, AB Volvo Technological Development is investigating the properties of traction batteries of different types. The aim is to find a suitable energy storage for electric/hybrid vehicles.
This master thesis examines the possibility of using a non-linear model of a traction battery to construct a device that accurately estimates the battery State of Charge (SoC
Modelling of an industrial control loop for concentration control using Omola, an object-oriented modelling language, is described. The major modelling effort has been made to make a complete nonlinear model of the pneumatic positioner-actuator of the control valve in the loop. A library of several friction models has also been developed. These models have been used to describe friction in the con
Communication delays in real time systems cause detoriation of the control performance of the closed loop system. To investigate this problem a process with varying delay is studied. Control of a motor in presence of delays is studied for different delay models. Design equations are derived based on polynomial design. The design depends on the designer's choices, i.e. desired closed-loop behav
To handle controllers conveniently in PLC systems, a host computer and a program with a graphical user interface for setting up and tuning controller parameters facilitate this task. This report describes the development of such a program at Beijer Electronics in Malmö. This tool for use with Mitsubishi's PLC systems supports logging of up to 32 simultaneous control loops which of one of these
This report deals with the damping of sub-synchronous oscillations in power systems. The method is based on estimation of the generator rotor angle and shaft speed, by measuring the line current and the voltage across a phase-compensating series capacitor. These two signals are probably not sufficient, so a line-to-ground voltage measurement is added. However, this means increased costs. A thyrist
A library of Omola models for modeling and simulation of mechanical multibody systems in three dimensions has been developed. It contains common basic mechanical components such as springs and joints of different kinds. Omola is an object-oriented modeling language and supports flexability. The modularization and inheritance concepts supports easy modification of models. The library contains abstr
