Adaptive Line Protection Based On Integrated Protection

In order to meet the requirements of selectivity of protection, setting calculation of traditional protection according to the most serious situation, it leads to that setting value is not the best for the other operation modes of system. Besides, because of the low sensitivity in some serious fault operating conditions, protection will refuse to operate and arousing poor performance. To solve the above-mentioned problems, adaptive protection arises at the historic moment. It can adjust setting value based on the actual conditions and make sure protection in good working status. As a new style of protection scheme, integrated protection has enough information and effective calculation, these make it easy to create algorithms and expand functions based on traditional protection. This thesis relys on researching prototype of integrated protection, introducing adaptive protection strategies into integrated protection system and realizing protection function of adaptive line protection. Taking the function of human-machine interaction with adaptive line protection thread as an example, the thesis also designs and realizes remote man-machine interactive system.The thesis analysis the principle of adaptive current instantaneous protection and adaptive voltage instantaneous protection, putting forward protection algorithm combining the adaptive current instantaneous protection with adaptive voltage instantaneous protection, through the simulation reveals that the integrate protection algorithm is effective and feasible.Putting forward setting principle of adaptive Ⅱ sect current instantaneous protection, using adaptive algorithm to II sect and over zero-sequence current instantaneous protection to form adaptive Ⅱ sect and over zero-sequence current instantaneous protection. Simulation indicates that adaptive Ⅱ sect and over zero-sequence current instantaneous protection extends the range of protection effectively on the basis of selectivity of protection and has a better sensitivity than traditional protection.According to the information sharing advantages of integrated protection, proposes several improved schemes of line protection based on integrated protection. Through analyzing the data flow of integrated protection prototype platform, presents the adaptive line protection thread configuration and its programming method based on digital integrated protection platform. Using Real-time digital simulator to build network model and identify the availability of adaptive line protection algorithm.Data storage system and remote man-machine interactive system are two important parts of integrated protection system. The thiese plans and designs the integrated protection database system, describes the contents and relationships of all tables. Taking the function of human-machine interaction about adaptive line protection thread as an example, researches the methods of man-machine interactive system connecting to data-bases and develops the remote man-machine interactive integrated protection system based on Web server.