Research On Network Based Fault Traveling Wave Protection Method For Power Grids

With the rapid development of the power systems and the growing of the grid-scale, that people must quickly and accurately find and exclusion the failure point of the power grid, and the voice that ensure safe and stable operation of the power grid are growing. For construction and development of the power system how to fast and precise positioning the failure point of the power grid has gradually become an important issue. In recent years, as the development of signal acquisition technology, high-precision timing technology, intelligent mathematical analysis and a series of science and technology, greatly facilitated the study of the traveling wave power grid protection technology, as to achieve fault traveling wave transmission line distance protection is an important technology to ensure safe and stable operation of the power grid. Paper comprehensive analysis and summary the existing techniques and methods of traveling wave protection at home and abroad, on this basis, proposed a new traveling wave protection method based on the wide area of the traveling wave information, it also proposes a method for optimal allocation of network fault traveling wave detection device.Thesis analyzes the research status of the traveling wave protection, elaborated on the main issues of principle as well as the protection of the traveling wave traveling wave protection technology, and carefully summarized and summary of the advantages and disadvantages of various traveling wave protection, then discuss and analyze the fault traveling wave signal propagation in the Power Grid, and detection and extraction of the fault traveling wave signal, that when failure occurs in the power grid of a transmission lines, the line will produce a high-frequency transient traveling wave signal, this signal can truly reflect the characteristics of fault signals, so we can carry out fault traveling wave protection by detecting transient traveling wave signal which contains the information. The above analysis and research, paper proposed a new traveling wave protection method based on the wide area of the traveling wave information, to effectively determine the selection of the fault lines according to the polarity of the voltage traveling wave signal and current traveling wave signal. In addition, it also proposes a method for optimal allocation of network fault traveling wave detection device, on the basis of all lines of the grid fault traveling wave signal can be detected, makes configuration of the traveling wave detection device a minimum number, thereby improving the economy and reliability of the power grid Traveling Wave Fault Location System, finally, using ATP-EMTP simulation software simulation analysis to verify the feasibility of the protection methods and configuration methods.Paper proposed a new traveling wave protection method based on the wide area of the traveling wave information, it also proposes a method for optimal allocation of network fault traveling wave detection device. These two new methods to promote the development of the traveling-wave network protection technologies and systems, laid a solid foundation for the promotion and application of the traveling wave traveling wave protection technology and fault detection traveling wave device configuration.