| Energy-rich areas are far away from the developed areas in China and the reverse distribution of energy resources and the productivity development has made the long distance, large capacity transmission a distinctive feature of electricity transmission in China. With the rapid development of national economy, the total electricity consumption demand increases and that ends up with the shortcoming of transport capacity and transmission corridor shortage of500kV power system. It is difficult to meet the needs of the future electricity demand. Therefore, the development of ultra high voltage power transmission is an important measure to ensure the coordinated development of power and social economy. The obvious advantages of high parameter and low energy consumption of1000MW units have made them widely used in power system. The research of technology of large capacity thermal power unit connected to the UHV grid has important theoretical and practical application.In this paper, the connection mode and power supply of1000MW thermal power units connected to UHV are optimized and compared in terms of reliability and economy. The protection schemes of generator, transformation and generator circuit breaker are put forward through the analysis of key technology of generator transformer group protection. The supervisory control system DCS and ECMS are deeply investigated. The content and schemes of supervisory are put forward. Finally this paper introduces the design of1000MW thermal power unit in a typical power plant access to UHV power transmission in our country and this can provide valuable reference. |
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