Effects of VSC based HVDC system on distance protection of transmission lines

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Alam, MM (Author) Other; Helder Leite (Author) FEUP; Liang, J (Author) Other; Carvalho, AD (Author) Other

Journal

Title: International Journal of Electrical Power & Energy Systems

Vol. 92

Pages: 245-260

ISSN: 0142-0615

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00M-TWJ

DOI: 10.1016/j.ijepes.2017.04.012

Abstract (EN): The priority to reactive power contribution from the Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) connection to support the grid during faults as suggested by the modern Network Code (NC) for HVDC affects the distance protection of transmission lines. Moreover, suppressing the negative sequence current during an unbalanced condition also interferes with the proper operation of the distance relays. This is because the current contribution from the converter is limited in magnitude and modified in the waveform in order to protect the power electronic devices during the fault in comparison to the synchronous generator fault current characteristics. This paper discusses the cause as well as the severity of the problems faced by the distance protection of transmission lines connected to the VSC based HVDC system by analyzing the apparent impedance analytically and in the simulation. The response of the relay to balanced and unbalanced faults lying on transmission lines is investigated. It is shown that the VSC limited reactive support and suppressed negative sequence current affect fault detection, forcing the relay to malfunction. The results of this paper can be used as a reference for understanding the effects of VSC-HVDC system on the operation of the distance protection during faults.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16