Loss and thermal redistributed modulation methods for three-level neutral-point-clamped wind power inverter undergoing Low Voltage Ride Through

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Abstract

The three-level neutral-point-clamped (3L-NPC) converter is a promising multilevel topology in the application of mega-watts wind power generation system. However, the growing requirements by grid codes may impose high stress and even give reliability problem to this converter topology. This paper investigates the loss and thermal performances of a 10 MW 3L-NPC wind power inverter undergoing Low Voltage Ride Through (LVRT) operation. A series of new space vector modulation methods are then proposed to relocate the thermal loading among the power switching devices. It is concluded that, with the proposed modulation methods, the thermal distribution in the 3L-NPC wind power inverter undergoing LVRT becomes more equal, and the junction temperature of the most stressed devices can be also relieved. Also the control ability of DC-bus neutral point potential, which is one of the crucial considerations for the 3L-NPC converter, is not compromised by the proposed modulation methods.
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The three-level neutral-point-clamped (3L-NPC) converter is a promising multilevel topology in the application of mega-watts wind power generation system. However, the growing requirements by grid codes may impose high stress and even give reliability problem to this converter topology. This paper investigates the loss and thermal performances of a 10 MW 3L-NPC wind power inverter undergoing Low Voltage Ride Through (LVRT) operation. A series of new space vector modulation methods are then proposed to relocate the thermal loading among the power switching devices. It is concluded that, with the proposed modulation methods, the thermal distribution in the 3L-NPC wind power inverter undergoing LVRT becomes more equal, and the junction temperature of the most stressed devices can be also relieved. Also the control ability of DC-bus neutral point potential, which is one of the crucial considerations for the 3L-NPC converter, is not compromised by the proposed modulation methods.
Original languageEnglish
Title of host publicationProceedings of the 21st IEEE International Symposium on Industrial Electronics (ISIE), 2012
PublisherIEEE Press
Publication date2012
Pages1880-1887
ISBN (Print)978-1-4673-0159-6
ISBN (Electronic)978-1-4673-0157-2
DOI
StatePublished - 2012
Publication categoryResearch
Peer-reviewedYes
Event21st IEEE International Symposium on Industrial Electronics - , China
Duration: 28 May 201231 May 2012

Conference

Conference21st IEEE International Symposium on Industrial Electronics
LandChina
Periode28/05/201231/05/2012

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