Title :
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
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;
Conference_Titel :
Power Conversion Conference - Nagaoka 1997., Proceedings of the
Conference_Location :
Nagaoka
Print_ISBN :
0-7803-3823-5
DOI :
10.1109/PCCON.1997.645616
