A state-space modeling and a neutral point voltage control for an NPC power converter

Author

Osawa, Chiharu ; Matsumoto, Yasushi ; Mizukami, Tetsuya ; Ozaki, Satoru

Author_Institution

Fuji Electr. Corp. Res. & Dev. Ltd., Tokyo, Japan

Volume

1

fYear

1997

fDate

3-6 Aug 1997

Firstpage

225

Abstract

Fluctuations of the neutral point voltage in NPC power converters cause problems such as excessively high voltage applied to their power devices. This paper presents a novel method of controlling the neutral point voltage by adjusting the dead-time that is required to prevent a DC-link short circuit. To analyze the dynamic effects of dead-time, a state-space averaged model for an NPC power converter is derived. This control method is applicable to single-phase NPC power converters, independent of the polarity of power flow, and free from the undesired variation of switching frequency of PWM. Experimental results have revealed satisfactory control performance

Keywords

PWM power convertors; bipolar transistor switches; control system analysis; control system synthesis; insulated gate bipolar transistors; power bipolar transistors; power semiconductor switches; state-space methods; switching circuits; voltage control; PWM switching frequency; control performance; dead-time adjustment; neutral point clamping; neutral point voltage control; power IGBT switches; single-phase NPC power converters; state-space modeling; Control systems; Pulse generation; Pulse width modulation; Pulse width modulation converters; Pulse width modulation inverters; Research and development; Switched capacitor circuits; Switching circuits; Switching converters; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Conversion Conference - Nagaoka 1997., Proceedings of the

Conference_Location

Nagaoka

Print_ISBN

0-7803-3823-5

Type

conf

DOI

10.1109/PCCON.1997.645616

Filename

645616