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A novel neutral point potential stabilization technique using the information of output current polarities and voltage vector

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6 Author(s)
Yamanaka, K. ; Mechatoronics R&D Dept., Yaskawa Electr. Corp., Kitakyushu, Japan ; Hava, A.M. ; Kirino, H. ; Tanaka, Y.
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This paper proposes a new neutral point potential control technique for the neutral-point-clamped three-level inverter. Utilizing the phase current polarity information, this technique distributes the redundant voltage vectors in a manner to obtain stable neutral point voltage under all operating conditions including the zero-power-factor condition. Detailed analysis and computer simulations show the superiority of the proposed method. The feasibility of the proposed method has been proven via laboratory experiments.

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Industry Applications, IEEE Transactions on  (Volume:38 ,  Issue: 6 )