Abstract
Distributed parameter characteristics of Ultra-long Distance Transmission Lines (UDTLs) are prone to cause harmonic amplification. Amplified harmonic components deteriorate the quality of energy delivery, and consequently affect the safety and operations of a power grid. This paper proposes a method based on Frequency-Length Factor (FLF) to investigate the harmonic transmission characteristics (HTCs) for UDTLs, including Half-Wavelength Transmission Lines (HWTLs). The proposed method considers the impact of line loss and reveals the comprehensive effects of line length, operation mode, and frequency on HTCs analysis for UDTLs. It is proved that only inter-harmonics can be amplified and cause resonance in lossy standard HWTLs propagation. Using the proposed method, the severity of harmonic amplification is quantitatively calculated. Additionally, this paper provides a fast evaluation approach for potential resonance frequencies of UDTLs, mitigating power quality issues caused by harmonic amplification. The effectiveness of the proposed method is verified by PSCAD simulation.
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