Review of different fault detection methods and their impact on pre-emptive VSC-HVDC dc protection performance

High Voltage

Bin Chang¹  Paul Coventry²  Roger Shuttleworth³  Oliver Cwikowski³  Antony Beddard³  Mike Barnes³ 

[1] Global Energy Interconnection Research Institute;National Grid;The University of Manchester;

关键词: HVDC power convertors;    HVDC power transmission;    fault diagnosis;    power transmission faults;    voltage-source convertors;    power transmission protection;    circuit breakers;    fault detection methods;    preemptive VSC-HVDC dc protection performance;    multiterminal voltage-sourced converters;    high-voltage direct current transmission system;    HVDC transmission system;    low dc-side impedances;    sensitive power electronics;    two-level converters;    modular multilevel converters;    hybrid circuit breaker switching models;    frequency-dependent phase models;    dc cables;    HVDC fault protection methodologies;    power electronics system;    post-fault system recovery response;    bump-less transfer control;   

DOI  :  10.1049/hve.2017.0024

来源: DOAJ

【 摘 要 】

Multi-terminal voltage-sourced converters (VSC) high-voltage direct current (HVDC) transmission system is expected to play a vital role in future power systems. Compared with ac power transmission, dc transmission is more vulnerable to faults due to low dc-side impedances and sensitive power electronics in the converters. Dc protection issues must be tackled before any multi-terminal VSC-HVDC grid can be built. The multi-terminal VSC-HVDC system is studied in detail using switching models for two-level converters, detailed equivalent models for the modular multi-level converters, detailed hybrid circuit breaker switching models and frequency-dependent phase models for dc cables. Using such high-fidelity system models, a systematic study of HVDC fault protection methodologies in more detail than previous studies is conducted. This is the first comprehensive study that includes pre-emptive circuit breaker operation. The results presented in this study underline the benefits of such a detailed treatment of the breaker, and of considering it as part of a fast power electronics system rather than isolated dc equipment. The study identifies the best existing fault detection method and tests it extensively. In order to further improve post-fault system recovery response, which is a key but often neglected part of previous studies, a novel bump-less transfer control has been implemented in the converters.

【 授权许可】

Unknown