HVDC Converter Transformers Protection - Part 2: Differential Function Assessment

This paper will analyze the performance of the differential protection of converter transformers that are part of Line-Commutated Converter (LCC) High-Voltage Direct Current (HVDC) systems in the face of transient distortions caused by these systems in the AC network connected nearby. The study will...

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Bibliographic Details
Main Authors: de Oliveira, Glaufe S., Silva, Cesar C. de S., Ribeiro, Nilo S. S., e Silva, Kleber M.
Format: Conference Proceeding
Language:English
Subjects:
Converter transformer
Distortion
Estimation
harmonic distortion
High-voltage techniques
HVDC
HVDC transmission
Power system harmonics
transformer protection
Transformers
transient response of converters
Windings
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Summary:This paper will analyze the performance of the differential protection of converter transformers that are part of Line-Commutated Converter (LCC) High-Voltage Direct Current (HVDC) systems in the face of transient distortions caused by these systems in the AC network connected nearby. The study will investigate the behavior of the differential protection during external faults in both the AC and DC systems, during transformer energization, and winding faults. To achieve this, the systems will be modeled in software ATP/ATP Draw, considering the employed control logic. The results reveal that transient distortions occurring in the evaluated scenarios can lead to improper op-erations of the differential protections. This includes non-operation for internal faults due to improper blocking and restrictions caused by harmonics or errors in phasor estimation of currents, as well as improper operations for external faults due to phasor estimation failures in current measurements.
ISSN:2768-0045
DOI:10.1109/WCNPS60622.2023.10344533