Research And Application Of Primary Frequency Regulation For Thermal Power Plant

Recently, primary frequency of interconnected generator has almost been put into operation. But the function cannot often satisfy the demand of power network operation, and has bad effects in the safe and stable operation of generator unit controlling. The main problem is the unreasonable scheme design, which makes primary frequency unavailable. And much worse is that the movement of primary frequency effects the stability of generator unit too much. In order to ensure the safe and stable operation of generator unit, part of power plants cut off primary frequency operation manually, or set technology parameters of primary frequency conservatively, or takes methods to enhance primary frequency action dead zone and lower primary frequency action value, which is based on reducing generator unit involved in grid frequency performance. To solve these problems, this paper researchs on how thermal power generator unit, especially 300MW fired generator unit, to realize primary frequency and improvement method.First of all, This article start talking about the mandatory provisions of Network company for the requirement of primary frequency of the thermal power plant and the importance of it. at the same time,This page also analyzed the situation about the primary frequency of current thermal power plant. Secondly on the basis of the situation about thermal power plant's primary frequency. This article expounded the necessity for the function of Primary Frequency. Thirdly, This page conducted a series analysis and research about the main links of Primary Frequency such as Main Targets,Achievement Scheme and Problems etc; and does a demonstration research on the expand project of Xuanwei thermal power plant about primary frequency situation and the control method;finally points out the problems that the primary frequency may merge during the process being under construction, gives some suggestions, Therefore this article serves as an reference for other thermal power plant on the aspect of the design and achievement in the primary frequency.The article through xuanwei generating company primary frequency of function design, implementation and test analysis, obtains the best units primary frequency implementation scheme is CCS+DEH scheme, also provides the specific application of CCS system and DEH system of primary frequency instructions and control logic. Finally the experiment has proved that CCS+DEH scheme can satisfy the grid's request, and it also can ensure the unit operation of stability and security.