作者:
CS Chen，CW Liu，JA Jiang
关键词:
eigenvalues and eigenfunctions ； fault location ； parameter estimation ； power system measurement ； power transmission faults ； power transmission lines ； power transmission protection ； relay protection ； synchronisation ； 345 kV
摘要:
This paper proposes a brand-new adaptive phasor measurement unit (PMU)-based protection scheme for both transposed and untransposed parallel transmission lines. The development of the scheme is based on the distributed line model and the synchronized phasor measurements at both ends of lines. The fault detection and location indices are derived by means of eigenvalue/eigenvector theory to decouple the mutual coupling effects between parallel lines. The two proposed indices are used in coordination such that the internal and external fault events can be distinguished completely. By on-line estimating the line parameters under the actual power system conditions, the proposed scheme will respond more accurately to power system faults. Extensive simulation results using EMTP have verified that the accuracy of the fault location achieved is up to 99.9%. The proposed protection system responds well and fast with regard to dependability and security. All the results show that the performance of the proposed detection/location indices is independent of fault types, locations, resistance, source impedance, fault inception angles, and load flows.
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