Fault distance estimation in multiterminal HVDC systems using the

Author(s)

Lacerda, Vinicius A. ^[1] ; Monaro, Renato M. ^[1] ; Coury, Denis V. ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Paulo - Brazil

• Document type: Journal article
• Source: Electric Power Systems Research; v. 196, JUL 2021.
• Web of Science Citations: 0

Abstract

Multiterminal high-voltage direct current (MTDC) systems still need to be improved in terms of protection to maximize their availability. In this paper, a new distance protection algorithm is proposed. The fault distance is estimated using the frequency of the DC-side voltage oscillation and the cable travelling wave speed. The frequency is estimated using the Lomb-Scargle Periodogram (LSP). The LSP can calculate a signal spectral power for arbitrary frequency values. It can also process signals with missing samples, which makes it easier to use in realworld applications when data can be lost in the communication. In the proposed algorithm, only local measurements are used, without communication. The proposed algorithm was tested in a four-terminal MTDC system and was fully selective in simulation environment. To further verify the technique's applicability, the proposed algorithm was embedded in a digital signal controller, and was simulated in real-time. In all the tests simulated in hardware, the faults were correctly detected and identified as being internal (zone 1) or external (zone 2). The results highlighted the potential of the Lomb-Scargle Periodogram and indicated that the proposed algorithm could be used in real-world applications, adding selectivity to multiterminal DC protection schemes. (AU)

• FAPESP's process: 15/21167-6 - Fault detection, fault location and intelligent protection of multiterminal HVDC lines
• Grantee: Vinícius Albernaz Lacerda Freitas
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)