Analysis of variation of neutral point potential in neutral-point-clamped voltage source PWM inverters

Author

Ogasawara, Satoshi ; Akagi, Hirofumi

Author_Institution

Okayama Univ., Okayama, Japan

fYear

1993

fDate

2-8 Oct 1993

Firstpage

965

Abstract

The authors present the analysis of the neutral-point potential variation of the neutral-point-clamped voltage source PWM (pulse-width-modulation) inverter (NPC-VSI) for AC motor drives and static VAr compensators (SVC). The potential variation is analyzed with the focus on the current flowing out of or into the neutral point of the DC link. The theoretical minimum capacity of the DC link capacitors is discussed for its application to both a vector-controlled induction motor system of 2.2 kW and a SVC system of 10 MVA, 6.6 kV, 60 Hz. It is shown that the proposed control scheme makes it possible to suppress the neutral-point potential variation within a few percent, so that the total capacity of the DC link capacitors in the NPC-VSI is almost the same as that in the conventional voltage source inverter

Keywords

AC motors; electric drives; invertors; power capacitors; pulse width modulation; static VAr compensators; 10 MVA; 2.2 kW; 6.6 kV; 60 Hz; AC motor drives; DC link; VSI; capacity; neutral point potential; neutral-point-clamped; power capacitors; static VAr compensators; vector-controlled induction motor; voltage source PWM inverters; AC motors; Capacitors; Control systems; Inductors; Pulse width modulation; Pulse width modulation inverters; Static VAr compensators; Switching circuits; Transformers; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE

Conference_Location

Toronto, Ont.

Print_ISBN

0-7803-1462-X

Type

conf

DOI

10.1109/IAS.1993.299015

Filename

299015