Techniques for practical qualitative approach using commercial power system simulation software for industrial applications

摘要

The differences between power system simulation commercial software designed for utility or large power system applications and industrial applications are obvious considering their capabilities and applications itself. The software for utility application have more transparent layers while offering the capabilities of different applications of the software, whereas the software for industrial applications allow only few layers to be accessed by the user as it aims for minimal set of solutions by hard-coding few functionalities. This however does not reduce the accuracy and performance of software but often restrict the user to quantitative results like time domain response which are good enough for most cases. Under some conditions, the user of the software may be required to do the qualitative analysis of the system like frequency domain analysis. The user either chooses to ignore it or purchase another software (or add-on in the same software if present) to perform required studies. An attempt is made to utilize the software to its maximum capabilities so as to allow the user to apply few practical techniques and obtain the desired qualitative results without going for another software or add-on module. This can be done using analytical as well as measurement based techniques like frequency scanning. As a case study, ETAP software is considered and the procedure to tune the power system stabilizer of a synchronous machine connected to infinite bus using a simple frequency scan is presented.