Research On Intelligent Protection System In Coal Mine Power Network Based On WAMS

This IEEE 1588 defines a precision time protocol (PTP) for networked measurement and control systems, which supports systemwide synchronization accuracy in the submicrosecond range. This paper introduces the principle of high precision clock synchronization and the PTP clock models defined in IEEE 1588 standard. According to topological structure of substation communication network conforming to IEC 61850 standard, application schemes of IEEE 1588 in coal mine substation are proposed, and their advantages and disadvantages are also discussed. Then the redundancy configuration method of clock unit and its function implement are given. Clock synchronization error of IEEE 1588 standard is theoretically analyzed. At last, concrete systemwide application strategies of IEEE 1588 standard in area power network are researched.Signal differences model was constructed based on FFT (Fast Fourier Transform) in this article and zero sequence over-current waveform spectrum differences of transient stage are recognized. A new method of transient signal waveform similarity comparison is established, and used selective leakage protection system in coal mine power system. The accuracy, adaptability, effectiveness etc. of the new selective leakage method are verified by simulation.