Abstract
Three-level Neutral-point-clamped (3L-NPC) topology is becoming a realistic alternative to the conventional one in high-voltage and high-power application. Studies show that the power cycling mean time to failure (MTTF) of the semiconductor bond wire in 3L-NPC inverter system may be very short under some common conditions. Firstly, this paper shows the impact of some key parameters on power electronic system lifetime according the analysis of semiconductor failure mechanism. Secondly, a switching frequency reduction method based on the position relationship between the flowing current and load voltage is applied to reduce power cycle and switching losses. And then, three-level active neutral point-clamped topology is taken into account to wake the most thermo stressed device. In order to validate the improve lifetime method in this paper, a 2MW 3L-NPC converter used in wind energy has been simulated. Finally, the described method has been tested in a 7.5kVA scalable prototype.
Original language | English |
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Title of host publication | Proceedings of the International Conference on Electrical Machines and Systems, ICEMS 2014 |
Number of pages | 7 |
Publisher | IEEE Press |
Publication date | Oct 2014 |
Pages | 974 - 980 |
ISBN (Print) | 978-1-4799-5162-8 |
DOIs | |
Publication status | Published - Oct 2014 |
Event | 17th International Conference on Electrical Machines and Systems, ICEMS 2014 - Hangzhou, China Duration: 22 Oct 2014 → 25 Oct 2014 |
Conference
Conference | 17th International Conference on Electrical Machines and Systems, ICEMS 2014 |
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Country/Territory | China |
City | Hangzhou |
Period | 22/10/2014 → 25/10/2014 |