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When a nuclear power plant is in normal operation, the generated electric energy is divided into two circuits. One is boosted and transmitted to the State Grid and the other (about 5%) is used for the electrical equipment in the nuclear power plant after voltage reduction. As an important part on the user side of smart grid, the Energy Management System (EMS) is of great significance for reducing energy consumption. Meanwhile, under the unique environment of high humidity and high salinity of nuclear power plants, Heating, Ventilation, and Air Conditioning (HV AC) accounts for most of the energy consumption except nuclear power unit. An EMS optimization decision problem is usually formulated in multiple timescales. In order to make the electric dispatching for electrical equipment (represented by HV AC) except nuclear power unit and improve environment comfort, a two-timescale optimization decision model is built in this paper. According to the characteristic of nuclear power plant, the state relationship of two-timescale is in mean value type, and the consistency of two-timescale is guaranteed. With the actual data of a nuclear power plant in China, the results of case study demonstrate the validity of the proposed model and it can satisfy the environment comfort with energy limited.
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