分散型電源は基幹系統における大外乱発生時に，分散型rn電源自身の機器保護や，ローカル系統の事故・単独系統発rn生時のための各種保護装置が誤動作し，脱落してしまう可rn能性がある。%The secondary system is expressed by reduced model in trunk transmission system analysis. So, many distributed generators that exist in secondary system are expressed by reduced model. But, by representing distributed generators by reduced model, a partial dropout of distributed generators cannot be expressed. Therefore there is a possibility that we cannot analyze accurately. Then, we studied the modeling method of dropout characteristic which distributed generators are expressed by reduced model. To obtain the dropout characteristic, we ran the parameter study by the detailed model and the reduced model in secondary system on same conditions. By the parameter study, in the dropout characteristic, we obtained the result that there is the correlation of the remaining rate of voltage in the primary system with the containing rate of induction machine in the secondary system. As a result, we contrived the dropout characteristic in which two above-mentioned were assumed to be a parameter. And, to confirm the validity of the contrived dropout characteristic, we calculated the amounts of dropout of distributed generator are two or more conditions by both the detailed model and the reduced model.
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