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The damage of overvoltage and arc caused by strongly pulling out the magnetic switching in the traditional process of deexcitation makes the deexcitation problem of the large generator become an important research subject. The technology of power electronics soft-switching provides a new way for the deexcitation of the large generator. In this paper, the topology of deexcitation system and its corresponding control circuit is designed, and it depend on the excitation parameters of the "Three Gorges" power plant. It propose a new way to design the non-linear resistor of energy consumption in deexcitation, or "parallel charged, series discharged", which significantly reduces the impact of voltage in deexcitation process, the deexcitation main switch is turned off when the main circuit current reduce to zero. The theoretical analysis prove that the deexcitation time is 0.51s and it's 0.4s from the simulation analysis. The results indicate that the deexcitation system with new topology can be fast, safe and reliable.International Forum on Energy, Environment and Sustainable Development (IFEESD 2016)

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