Projects per year
Abstract
Whilst third harmonic injection is extensively used in modular multilevel converter (MMC) control, its significant advantages over sinusoidal modulation have not been fully explored. This paper evaluates the influence of third harmonic injection on system power losses, submodule capacitance, circulating current, and fault current and mathematical models are derived. Station conduction losses are reduced by 11%, yielding higher efficiency and lowering cooling system capacity. The submodule capacitance is reduced by 24%, which significantly lowers the capital cost, weight, and volume of the station converter. Additionally, the phase energy variation is reduced by around 18%, which benefits circulating current control. Due to the lower AC currents, the semiconductor current stresses are correspondingly reduced. In addition to the performance improvement in normal operation, the third harmonic injection reduces the DC fault currents by 13.4% and thus the fault current stresses on semiconductors and DC circuit breakers are lowered. Simulation of a point-to-point HVDC system demonstrates the effectiveness of the above analysis.
Original language | English |
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Pages (from-to) | 5764-2770 |
Number of pages | 7 |
Journal | IET Generation, Transmission and Distribution |
Volume | 10 |
Issue number | 11 |
DOIs | |
Publication status | Published - 4 Aug 2016 |
Keywords
- DC fault current
- HVDC transmission
- modular multilevel converter (MMC)
- power loss
- submodule capacitance
- third harmonic injection
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Dive into the research topics of 'Influence of third harmonic injection on MMC-based HVDC transmission systems'. Together they form a unique fingerprint.Projects
- 2 Finished
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Underpinning Power Electronics 2012: Converters Theme
Finney, S. & Holliday, D.
EPSRC (Engineering and Physical Sciences Research Council)
1/11/13 → 31/10/17
Project: Research
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DC Transmission and Distribution Networks
Williams, B. & Holliday, D.
EPSRC (Engineering and Physical Sciences Research Council)
1/03/13 → 16/12/16
Project: Research
Activities
- 1 Visiting an external academic institution
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University of New South Wales (UNSW)
Rui Li (Visiting researcher)
Nov 2015 → Jan 2016Activity: Visiting an external institution types › Visiting an external academic institution