Dynamic Analysis of a Modular Multilevel Converter Based VSC-HVDC System Incorporating Transformer Magnetisation Characteristics
Dynamic Analysis of a Modular Multilevel Converter Based VSC-HVDC System Incorporating Transformer Magnetisation Characteristics
- Author(s): J. Vaheeshan ; M. Barnes ; R. Shuttleworth
- DOI: 10.1049/cp.2015.0007
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- Author(s): J. Vaheeshan ; M. Barnes ; R. Shuttleworth Source: 11th IET International Conference on AC and DC Power Transmission, 2015 page ()
- Conference: 11th IET International Conference on AC and DC Power Transmission
- DOI: 10.1049/cp.2015.0007
- ISBN: 978-1-84919-982-7
- Location: Birmingham, UK
- Conference date: 10-12 Feb. 2015
- Format: PDF
When an HVDC system is subjected to AC side short circuit faults, the transformer core might be driven to saturation at fault recovery due to flux offset. The saturation will therefore cause the flow of inrush currents. In this paper, dynamic models of a MMC based VSC-HVDC system incorporating transformer magnetisation characteristics are derived and verified. Using disturbance sensitivity functions, the impact of attenuation of inrush currents due to different locations of current sensors (of inner current controller) is investigated. It is shown that placing the current sensor at the converter side of the transformer enable the inrush currents to attenuate faster and prevents the converter from overcurrent exposure, allowing it to more successfully ride-through faults.
Inspec keywords: transformer cores; HVDC power convertors; short-circuit currents; sensitivity analysis; electric current control; magnetic flux
Subjects: Transformers and reactors; DC-AC power convertors (invertors); Current control; Magnetic cores; AC-DC power convertors (rectifiers); Control of electric power systems
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