PWM Control Method for NPC Inverters with Very Small DC-Link Capacitors

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概要

• 論文の詳細を見る

• This paper examines the neutral voltage variations on a neutral point clamped (NPC) inverter circuit and proposes a new PWM technique which allows a great reduction in the capacitor values. Conventional and advanced control methods of the neutral point potential are analyzed demonstrating that the use of medium size vectors generates voltage fluctuations which can only be reduced by increasing the capacitor values. In this paper a new PWM control method is introduced. Different from former techniques, the use of the medium size vectors is avoided, increasing the neutral voltage controllable region to the whole range of operation under any load conditions making it possible to operate the NPC inverter with very small DC-link capacitors. The suitable voltage vector is carefully selected to reduce the output waveform distortion. The proposed PWM technique is experimentally verified on a low-power prototype and is compared with advanced control methods. The simulation and experimental results have shown that the proposed technique allows a great reduction in the capacitor values.

• 社団法人 電気学会の論文
• 1995-11-20

著者

• Rojas R

  The University Of Tokushima

• SUZUKI Takayuki

  The University of Tokushima Dept. of Electrical and Electronic Engineering, Faculty of Engineering

• Ohnishi Tokuo

  The University Of Tokushima

• ROBERTO Rojas

  The University of Tokushima

• Suzuki Takayuki

  The University Of Tokushima

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