Basic study of dropout by phase jump characteristic modeling of distributed generators in secondary system for trunk transmission system analysis

The secondary systems are expressed by a reduced model in trunk transmission system analysis. Thus, multiple distributed generators in the secondary system are expressed by the reduced model. But by representing distributed generators by the reduced model, partial dropout of distributed generators cannot be expressed, and therefore there is a possibility that we cannot perform an accurate analysis. Consequently, we studied a method of dropout characteristics in which distributed generators are expressed by the reduced model. To obtain the dropout characteristic, we performed parameter studies by the detailed model and the reduced model on a secondary system under the same conditions. The parameter study indicated that in the dropout characteristic the remaining voltage in the primary system is correlated with the percentage of induction machines in the secondary system. Thus, we derived a dropout characteristic in which the above two quantities were taken as parameters. To confirm the validity of this dropout characteristic, we calculated the dropout magnitudes of the distributed generator for two or more conditions with both the detailed model and the reduced model. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 172(1): 27–37, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20869