Lehrveranstaltung
„Umwandlung elektrischer Energie mit Leistungselektronik“
Stromzwischenkreisumrichter
Current Source Inverter (CSI)
Prof. Dr.‐Ing. Ralph Kennel
(ralph.kennel@tum.de)
Technische Universität München
Arcisstraße 21
80333 München
Converters
Technische Universität München
converters
Stromrichter
power controllers
converters
Steller
Umrichter
(AC) power controller
Rectifier
Drehstromsteller
Gleichrichter
Inverter
chopper controller
Gleichstromsteller
Direktumrichter
boost converter
Hochsetzsteller
buck converter
Tiefsetzsteller
Wechselrichter
direct converter
matrix converter
link inverter
Matrixumrichter
Zwischenkreisumrichter
cyclo converter
voltage source inverter
(VSI)
Spannungszwischenkreisumrichter
resonance inverter
Resonanzumrichter
current source inverter
(CSI)
Stromzwischenkreisumrichter
Converters
Technische Universität München
converters
Stromrichter
power controllers
converters
Steller
Umrichter
(AC) power controller
Rectifier
Drehstromsteller
Gleichrichter
Inverter
chopper controller
Gleichstromsteller
Direktumrichter
boost converter
Hochsetzsteller
buck converter
Tiefsetzsteller
Wechselrichter
direct converter
matrix converter
link inverter
Matrixumrichter
Zwischenkreisumrichter
cyclo converter
voltage source inverter
(VSI)
Spannungszwischenkreisumrichter
resonance inverter
Resonanzumrichter
current source inverter
(CSI)
Stromzwischenkreisumrichter
Technische Universität München
Basic Strategies in Power Electronics
an inductance has to be integrated
either here or here
power electronics
(rectifier)
power electronics
(inverter)
M
U0
electrical (voltage) power supply
= voltage source
capacitor
in the DC link
= voltage source
electrical motor
= voltage source with inductance
voltage source inverter (VSI)
= current source
Technische Universität München
Basic Strategies in Power Electronics
power electronics
(rectifier)
power electronics
(inverter)
M
U0
electrical (voltage) power supply
= voltage source
inductance
in the DC link
= current source
electrical motor
= voltage source with inductance
current source inverter (CSI)
= current source
Technische Universität München
Basic Strategies in Power Electronics
power electronics
(rectifier)
power electronics
(inverter)
M
electrical (voltage) power supply
= voltage source
inductance
in the DC link
= current source
electrical motor
= voltage source with inductance
current source inverter (CSI)
= current source
Technische Universität München
15.10.09
Grundlagen DC/DC-Wandler
Technische Universität München
15.10.09
Grundlagen DC/DC-Wandler
Technische Universität München
15.10.09
Grundlagen DC/DC-Wandler
Technische Universität München
15.10.09
Technische Universität München
15.10.09
Technische Universität München
15.10.09
Technische Universität München
15.10.09
Technische Universität München
15.10.09
Current Source Inverter (CSI)
Technische Universität München
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 !!
Current Source Inverter (CSI)
Technische Universität München
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)
Current Source Inverter (CSI)
Technische Universität München
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)
Technische Universität München
Thank You !!!
Any Questions ?
Prof. Dr.-Ing. Ralph Kennel
Technische Universität München
Electrical Drive Systems and Power Electronics