CASED: a simulation package designed for variable speed drives
Article Abstract:
In recent years there has been an increase in the types and usage of AC variable speed drives. However, as the complexity of these systems has increased, so has the occurrence of problems which are often caused by the interaction of the various drive components. The authors have developed CASED which allows users to simulate complete drive systems. An overview is given of the types of models used for the converter and the motor, from which it is seen that three special features are required. Firstly the models are modular in nature, hence the simulator must be able to link the various models. Secondly a combination of discrete and continuous time simulation is required to model the converters, and lastly there may occasionally be a need for specialized stiff differential equation (DE) solvers. It is shown that by choosing the correct DE solver the simulation time can be decreased by more than one hundred fold. CASED has shown itself to be a specialized and powerful tool in variable speed drive analysis. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1991
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A review of the UniFit II software package
Article Abstract:
The UniFit II software package is intended for aiding simulation analysts in the selection of an appropriate probability density function (PDF) to model a set of input data. The package uses a menu interface that lists the choices relevant for a specific operation at each step of the analysis; sub-menus run three or four levels deep in most cases, and on-line help screens are provided for each subsequent step in the PDF selection process. The program displays sample data clearly in histogram form as well as in various distribution function plots; data are input as ASCII files with values separated by blanks or carriage return/linefeeds. The three main modes of operation are guided model selection, manual model selection and no-data selection; each is described. UniFit II is an excellent data analysis tool for selecting PDFs to describe data sampled from some random process.
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1992
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