Stromzwischenkreisumrichter Current Source Inverter (CSI)

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1 course " Conversion of electrical energy with power electronics " Stromzwischenkreisumrichter Current Source Inverter (CSI) Prof. Dr. Ing. Ralph Kennel Arcisstraße München

2 Converters converters Stromrichter power controllers Steller converters Umrichter chopper controller Gleichstromsteller (AC) power controller Drehstromsteller direct converter Direktumrichter Rectifier Gleichrichter Inverter Wechselrichter boost converter Hochsetzsteller matrix converter Matrixumrichter link inverter Zwischenkreisumrichter buck converter Tiefsetzsteller cyclo converter voltage source inverter (VSI) Spannungszwischenkreisumrichter resonance inverter Resonanzumrichter current source inverter (CSI) Stromzwischenkreisumrichter

3 Converters converters Stromrichter power controllers Steller converters Umrichter chopper controller Gleichstromsteller (AC) power controller Drehstromsteller direct converter Direktumrichter Rectifier Gleichrichter Inverter Wechselrichter boost converter Hochsetzsteller matrix converter Matrixumrichter link inverter Zwischenkreisumrichter buck converter Tiefsetzsteller cyclo converter voltage source inverter (VSI) Spannungszwischenkreisumrichter resonance inverter Resonanzumrichter current source inverter (CSI) Stromzwischenkreisumrichter

4 Basic Strategies in Power Electronics an inductance has to be integrated either here or here power electronics (rectifier) power electronics (inverter) U 0 M electrical (voltage) power supply = voltage source capacitor in the DC link = voltage source electrical motor = voltage source with inductance = current source voltage source inverter (VSI)

5 Grundlagen DC/DC-Wandler

6 Grundlagen DC/DC-Wandler

7 Grundlagen DC/DC-Wandler

8 Grundlagen DC/DC-Wandler

9 Grundlagen DC/DC-Wandler

10 Grundlagen DC/DC-Wandler

11 front end : line commutated converter and smoothing choke self-commutated inverter variable speed induction machine

12 induction machine self-commutated inverter

13 induction machine self-commutated inverter

14 induction machine self-commutated inverter

15 induction machine self-commutated inverter

16 Current Source Inverter (CSI) in literature you can (sometimes) read that CSIs are less dynamic than VSIs this is completely nonsense!!! everything you can do with the output current of a VSI you can do in the same way with the output voltage of a CSI! with identical dynamics e. g. using the same PWM!! everything you cannot do with the DC voltage of a VSI you can also not do with the DC current of a CSI! both are not dynamic at all!!

17 Current Source Inverter (CSI) in fact there are 2 (!) problematic aspects when using CSIs for electrical drives : CSI as well as electrical machine are current sources they have to be decoupled by capacitance(s) this might cause dynamic problems between between the inductances and the capacitances involved (with electrostatic machines the situation would be better)

18 Current Source Inverter (CSI) in fact there are 2 (!) problematic aspects when using CSIs for electrical drives : the connection of several CSIs at the same DC link is not a reasonable solution (the problem is our way of thinking not the CSI technology) the combination must be done by serial connection instead of parallel connection however, there is no series of electrical machines based on currents instead of voltages (e. g. 400 V)

19 Thank You!!! Any Questions? Prof. Dr.-Ing. Ralph Kennel Electrical Drive Systems and Power Electronics