Digital Electro-hydraulic Control System And Its Research In 1000MW Unit

Following with the modern industry production development, energy demand increases increasingly, power industry to enter the more power grid, big unit and highly automation era. Thermal power unit also gradually from the previous small capacity units ( mainly 300MW following volume ) for the development of large capacity, high parameter unit(Even more than 1000MW unit 600MW).In 2004, the first domestic 600000 MW Supercritical Unit--Henan Qinbei Power Plant Unit 1 operation. In 2006, the first domestic ultra supercritical 1000MW unit in Zhejiang Yuhuan plant. As of December 31, 2010, China has been put into operation in 1000MW ultra supercritical unit reached 32 units, and is on the rise. At the same time, large capacity 1250MW, 1300MW units also began to enter into people's vision.Along with the single unit capacity to expand further and our country national economy steady and rapid development caused by electricity structure also produced tremendous change, peak valley difference is pulled further big. So for large unit automatic control system has put forward higher requirements. The main power equipment of steam turbine, the control system of digital electro-hydraulic control system ( DEH ) also put forward higher requirements. This topic in the steam turbine digital electro-hydraulic control system as the research object, the control principle, composition and control strategies in Zhejiang and Zhou Shan for the supercritical 1000MW unit implementation way research. The main research contents are as follows:1. The first issue of the combination of domestic and foreign situation as well as the history of the research background of this topic is expounded.2. This paper studies the characteristics of steam turbine control principle and mediation. At present digital electro hydraulic control system principle and adjusting parameters. 3. Combined with the subject of digital electro hydraulic control system principle and basic characteristics of the proposed mediation of steam turbine digital electro- hydraulic control system design.4. The research combined with the control principle of control strategy of this paper5. Combined with the building of Zhejiang Zhou Shan power plant for six transverse 1000MW ultra supercritical unit of the actual situation, put forward Zhejiang power plant in Zhou Shan for Zhou Shan and six horizontal configuration scheme.6. Presenting the summary and prospect.