Active common mode current reduction in multiinverter systems

Citation
A. Consoli et al., Active common mode current reduction in multiinverter systems, EL POW CO S, 29(4), 2001, pp. 321-334
Citations number
6
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
ELECTRIC POWER COMPONENTS AND SYSTEMS
ISSN journal
15325008 → ACNP
Volume
29
Issue
4
Year of publication
2001
Pages
321 - 334
Database
ISI
SICI code
1532-5008(200104)29:4<321:ACMCRI>2.0.ZU;2-8
Abstract
The paper deals with the common mode current issue in a multidrive system. Common mode currents are caused by steep variations of the common mode volt age, strictly related to the sequence of the inverter slates during the vol tage pulsewidth modulation. An inexpensive technique that allows compensati on of the common mode voltage variation zn multidrive systems composed of t wo or more inverters is proposed in order to eliminate the common, mode cur rents. The common mode current paths and generation mechanisms are reviewed and th e influence of the inverter state sequence on the common mode voltage and c urrents is pointed out. Based on such considerations, a new digital PWM mod ulation strategy is introduced to compensate the common, mode voltage varia tions generated in a two PWM inverter system.