The Study On Data Processing And Bus Protection Based On Integrated Protection

Integrated protection is a novel protection based on the IEC61850standard, fiber optic Ethernet technology and digital substation technology. Compared with the traditional independent protections, integrated protection can obtain all information of substation, and generated new algorithms and control function based on redundant information, make up the deficiency caused by lack of information, improve the performance of protection device. In this thesis, the data preprocessing problem and bus protection function are researched based on Integrated Protection platform.Firstly, an integrated data processing system is designed and completed in this thesis, including the data acquisition, the cache space structure, communication mechanism etc. The possible data issues in network transmission process is analyzed, and sampling packet reordering, network loss, bad data processing procedures are designed. Then the test work to verify correctness and real-time is completed.Secondly, a bus protection function thread is designed and implemented stand on the software architecture of integrated protection. After that the bus protection thread is tested under different fault initial phase angle.Thirdly, in this research, several existing problems of bus protection algorithms are analyzed, the electronic transformer clipping criterion and the interpolation fitting scheme are proposed and validated. To enhance the property of the bus protection, make full use of the advantages of information redundancy and powerful computing ability, the integrated bus protection algorithm based on information decentralized is proposed and tested. Finally, the improved centralized protection coordination logic is given.