AUTHOR=Zhang Guojiang , Zhao Jingbo , Jia Yongyong , Zhou Qian , Xu Ke 

TITLE=The HVDC commutation failure mechanism impacted by harmonics and its suppression method

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 12 - 2024

YEAR=2024

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2024.1420234

DOI=10.3389/fenrg.2024.1420234

ISSN=2296-598X

ABSTRACT=Voltage reduction and voltage distortion are the main causes of commutation failure. Although the problem of commutation failure caused by voltage distortion has been reported in the literature, it is called "abnormal commutation failure". However, most of the current research on commutation failure is based on the drop in fundamental voltage after a fault, and there are few reports on the impact of voltage distortion on commutation failure. Harmonics are an important cause of voltage distortion. This article first analyzes the generation and transmission characteristics of harmonics in AC and DC systems as well as the coupling degree of harmonics in DC systems. Then starting from the mechanism of the commutation process, a commutation failure analysis method based on harmonic voltage time area is proposed. This method can quantitatively analyze the impact of different harmonics on commutation failure. On this basis, the harmonic the criteria for causing commutation failure are established, and the harmonic characteristics of AC voltage when harmonics cause subsequent commutation failure are quantitatively analyzed. Finally, a preventive controller is proposed to suppress commutation failure caused by different harmonics.