Harmonic Analysis of CLCC-HVDC Based on Switching Function

• Published in: Proceedings - International Conference on Harmonics and Quality of Power pp. 391 - 396
• Main Authors: Feng, Qian, Du, Zhaoxin, Pan, Aiqiang, Bao, Wei, Zhou, Desheng, Sun, Ruke, Yang, Xiu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 15.10.2024
• Subjects: controllable line-commuted converter (CLCC); Current measurement; Harmonic analysis; Integrated circuit reliability; Pollution; Pollution measurement; Power harmonic filters; Power system reliability; switching function; Transmission line measurements; Valves; Voltage measurement
• ISSN: 2164-0610
• DOI: 10.1109/ICHQP61174.2024.10768702

The new Controllable Line-Commuted Converter (CLCC) with controllable turn-off capability employs a hybrid design of thyristors, combining the low cost and high reliability of conventional converters. During AC faults or disturbances, it uses a flexible DC auxiliary circuit to achieve forced commutation, thereby addressing the commutation failure issues of LCC converters and enhancing the stability and reliability of high-voltage direct current (HVDC) transmission systems. To study the characteristics of electric power quality and improvement measures in the AC/DC transmission system at the receiving end after integrating the new converter, a theoretical derivation based on modulation theory and commutation principles was conducted to explore the formation mechanisms of characteristic and non-characteristic harmonic components in the DC voltage and AC current. The harmonics of LCC-HVDC and CLCC-HVDC were analyzed in detail using FFT method on measured data from the converter stations.