Nearest-vector modulation strategies with minimum
amplitude of low-frequency neutral-point voltage
oscillations for the neutral-point-clamped converter
Nearest-vector modulation strategies with minimum
amplitude of low-frequency neutral-point voltage
oscillations for the neutral-point-clamped converter
This paper investigates the problem of low-frequency voltage oscillations that appear at the neutral point (NP) of a three-level neutral-point-clamped (NPC) converter. Starting with a detailed analysis of their origin, the paper derives the minimum amplitude of these oscillations that can be achieved by nearest-vector (NV) modulation strategies. It then proves that the criterion of the direction of dc-link capacitor imbalance, which is commonly adopted by NV strategies for performing the task of capacitor balancing, poses a barrier in achieving this minimum. A new criterion is proposed instead, together with an algorithm that incorporates it into existing NV strategies. For the case of NPC inverters operating as motor drives, the resulting reduction in the amplitude of NP voltage oscillations ranges from 30% to 50%. The approach has the advantage of avoiding the significant increment in switching losses and output voltage harmonic distortion, caused by other methods. Simulations in MATLAB-Simulink are used to illustrate its operation and verify that it offers the claimed benefit.
capacitor balancing, nearest-vector (nv) modulation strategies, neutral point (np) voltage ripple, neutral-point-clamped (npc) converter
4485-4499
Orfanoudakis, G.I.
b0aae674-1116-4c4c-a5bd-4578b2a7db52
Yuratich, M.A.
6107fcaa-e1a8-4afd-b06e-0e3dadf42d3c
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
October 2013
Orfanoudakis, G.I.
b0aae674-1116-4c4c-a5bd-4578b2a7db52
Yuratich, M.A.
6107fcaa-e1a8-4afd-b06e-0e3dadf42d3c
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Orfanoudakis, G.I., Yuratich, M.A. and Sharkh, S.M.
(2013)
Nearest-vector modulation strategies with minimum
amplitude of low-frequency neutral-point voltage
oscillations for the neutral-point-clamped converter.
IEEE Transactions on Power Electronics, 28 (10), .
(doi:10.1109/TPEL.2012.2236686).
Abstract
This paper investigates the problem of low-frequency voltage oscillations that appear at the neutral point (NP) of a three-level neutral-point-clamped (NPC) converter. Starting with a detailed analysis of their origin, the paper derives the minimum amplitude of these oscillations that can be achieved by nearest-vector (NV) modulation strategies. It then proves that the criterion of the direction of dc-link capacitor imbalance, which is commonly adopted by NV strategies for performing the task of capacitor balancing, poses a barrier in achieving this minimum. A new criterion is proposed instead, together with an algorithm that incorporates it into existing NV strategies. For the case of NPC inverters operating as motor drives, the resulting reduction in the amplitude of NP voltage oscillations ranges from 30% to 50%. The approach has the advantage of avoiding the significant increment in switching losses and output voltage harmonic distortion, caused by other methods. Simulations in MATLAB-Simulink are used to illustrate its operation and verify that it offers the claimed benefit.
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2013 - Oranoudakis, Yuratich and Sharkh - IEEE TPE - NPC Neutral oscillations.pdf
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e-pub ahead of print date: March 2013
Published date: October 2013
Keywords:
capacitor balancing, nearest-vector (nv) modulation strategies, neutral point (np) voltage ripple, neutral-point-clamped (npc) converter
Organisations:
Mechatronics
Identifiers
Local EPrints ID: 350823
URI: http://eprints.soton.ac.uk/id/eprint/350823
ISSN: 0885-8993
PURE UUID: b3708ff1-2b4e-4f70-a073-11553c4f7ae8
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Date deposited: 08 Apr 2013 14:41
Last modified: 15 Mar 2024 02:48
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Author:
G.I. Orfanoudakis
Author:
M.A. Yuratich
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