Research On The Method Of Security And Stability Control For Gezhouba Power Plant

With the fast development of electricity industry and the strategy implementation of "delivering power from west to east, exchanging between south and north", in our country, the installed capacity is greater, the structure is more Complicated, and operation mode of electric power system becomes more changeability, so the stability problem(especially the transient stability problem) of large power network is more complicated. For these reasons, it makes the application of security and stability control equipment gradually to become a kind of consensus. Currently, the security and stability control equipment has become a kind of indispensable and important means to guarantee the safe and stable operation of power network. Along with the application of computer technology in the electric power industry thoroughly, the research and development of device safety and stability for electric network based on computer have been obtained quiet great development and widely used.The original security and stability control equipment of Gezhouba Dajiang Power Plant is the old style of relay protection interlocking shut-down and load tripping device, and the function principle is too old to satisfy the demand of the security and stability control equipment. By further studying and discussing the basic principles, basic requirements and control strategy of new generation security and stability control equipment of power network, aiming at the features of load flow of all outgoing lines, the operation requirement of Yangtze river lowest flow rate to Dajiang power plant units during long dry period, two special electrical brake resistances in Dajiang power plant, and the stability control demand of central china power grid to Gezhouba Dajiang power plant, we have developed a set of Gezhouba Dajiang power plant microcomputer intelligent equipment, with security and stability control device (system). This equipment uses a stability control method with distributed type. Considering electric power system needs extremely high reliability, double microcontroller allocation was adopted in the system design. For there is certain distance between Dajiang switching station and power houses, this security and stability control system adopts decision machine and performance machine separately, saving a great deal of manpower and material resources. By analyzing the reform, it was verified that this kind of security and stability control equipment has correct and reasonable design, operating stably and credibility, and it is achieved the aim that as far as possible not to shear or shear Gezhouba Dajiang power plant generator, on the premise of ensuring operation security and stability of power system.