Inverter Topologies – Variable Speed Drives

Voltage-source inverter has a configuration where rate of change of voltage (dv/dt) in the inverter is limited by a large capacitor connected in parallel across the DC link. Current-source inverter has a configuration where rate of change of current (di/dt) in the inverter is limited by a large choke connected in series in the DC link.
Inverter Topology

The voltage-source inverter topology uses a diode rectifier to convert AC voltage to DC while current-source inverter topology user thyristors or Silicon Contrlled Rectifier (SCR) for the rectifier section. This is the reason why current source topology produces higher harmonics compared to voltage source topology. This is the reason why voltage-source are preferred to current-source. For large drives (above 20MW), current source is still preferred as it can operate in slightly leading power factor.

About the Author

Ver Pangonilo
A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia and Professional Electrical Engineer (PEE) - Philippines with extensive experience in concept select, front-end engineering, HV & LV detail design, construction and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and waste water pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).
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