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Abstract
Owing to the fact that travelling wave propagation in an HVDC grid is a heavily frequency dependent phenomenon, frequency domain analysis has been identified as a useful means of assessing the capabilities and limitations of non-unit protection. This exploits the fact that the main difference between an internal and external fault is the presence of the series inductor in the fault path. The inductor acts as a high impedance element for high frequency components and consequently the transient voltage frequency response in each fault case is recognisably different. On this basis, the investigation in the frequency domain can reveal significant information for protection design purposes. Towards this aim, the transient voltage at the relay location is meticulously represented in the frequency domain by taking into account the transmission medium length and geometry, the number of other attached feeders to the same bus, the converter parameters, the inductive termination, the fault resistance, and the travelling wave behaviour of DC faults. By performing a sensitivity analysis on these parameters, a deeper understanding of their impact on HVDC non-unit protection is obtained. In addition, the factors that can be adjusted to extend the reach of the protection systems are revealed and a generic approach for analytically calculating the protection threshold is developed.
Original language | English |
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Number of pages | 6 |
Publication status | Published - 12 Mar 2020 |
Event | The 15th International Conference on Developments in Power System Protection - Liverpool, United Kingdom Duration: 9 Mar 2020 → 12 Mar 2020 Conference number: 15th https://dpsp.theiet.org/ |
Conference
Conference | The 15th International Conference on Developments in Power System Protection |
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Abbreviated title | DPSP 2020 |
Country/Territory | United Kingdom |
City | Liverpool |
Period | 9/03/20 → 12/03/20 |
Internet address |
Keywords
- Frequency domain analysis
- HVDC grids
- HVDC protection
- non-unit protection methods
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Dive into the research topics of 'Frequency domain analysis of HVDC grid non-unit protection'. Together they form a unique fingerprint.Projects
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EPSRC Centre for Doctoral Training in Future Power Networks and Smart Grids
EPSRC (Engineering and Physical Sciences Research Council), Northern Powergrid Limited, Frazer-Nash Consultancy Ltd, Scottish Hydro-Electric Power Distribution PLC, S P Power Systems Ltd, UK Power Networks (Operations) Limited
1/04/14 → 31/03/23
Project: Research - Studentship