Transmission and distribution integrated analysis and evaluation system for distributed generation

As the amount of distributed generation supplied to distribution systems has expanded, neighbouring distribution systems or even transmission systems have been more affected according to penetration of distributed generation. However, until now, power system analysis has been conducted separately for the transmission system and distribution system. This way of analysis has had no problem in the existing power systems. However, with the rising DG connection in the distribution system, the need to reflect mutual interaction has elevated and the separated method became unable to do it properly. Transmission and distribution integrated analysis aims to enabling mutual interaction analysis. In this paper, a new methodology to evaluate the effect of distributed generation in the integrated transmission and distribution systems using on-line data. And by simulating mutual interaction, which could not be observed in previous system, case study results shows the need for transmission and distribution integrated systems with distributed generation.