Abstract
This paper presents a design procedure and loss estimation for a high power, medium voltage series resonant converter (entitled SRC#), intended for application in megawatt medium-voltage DC wind turbines. The converter is operated with a novel method of operation, entitled pulse removal technique, characterized by variable frequency and phase shift modulation, below the resonant point of the LC tank. A step by step design procedure is proposed and circuit component ratings and efficiency are compared for two variants. The new method of operation reduces transformer size to below 50% while losses are kept below 1.5% from zero to nominal power, due to soft-switching characteristics. An experimental setup, rated for 10 kW and 5 kV output was assembled to extract losses and validate the semiconductor loss model.
Original language | English |
---|---|
Article number | 8493299 |
Journal | I E E E Transactions on Power Electronics |
Volume | 34 |
Issue number | 7 |
Pages (from-to) | 6136 - 6154 |
Number of pages | 19 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - Jul 2019 |
Keywords
- Medium-frequency transformer
- Medium-voltage direct current (MVdc)
- Offshore wind farm
- Series resonant circuit (SRC)
- Sub-resonant mode