一种零序注入的三电平中点钳位型变换器中点电位平衡控制策略

doi:10.19595/j.cnki.1000-6753.tces.171299

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Abstract An in-depth comparison of two methods (SVPWM and VSVPWM) for the three-level converter is presented in this paper, and the disadvantages are analyzed such as high dv/dt of the line- to-line voltage, high harmonic contents, high power device switching losses, and slow neutral-point voltage-balancing dynamics of VSVPWM. In order to overcome the drawbacks of the two methods, a novel zero sequence injection carrier-based modulation scheme is proposed. Firstly, a zero sequence injection method for the two-level converter is introduced into a small hexagon of the simplified three-level space vector diagram, then the relationship between the neutral-point current and the zero sequence component is studied mathematically in each small hexagon. In addition, combined with the signs of switching functions in six small hexagons, the carrier-based modulation and the potential balancing control can be achieved with only one carrier wave and six expressions. The proposed method has the advantages of small calculation amount, short execution time and fast voltage-balancing dynamics. Finally, a comparison among three kinds of strategy (the proposed method, SVPWM, and VSVPWM) is presented, which verifies the feasibility and validity of the proposed method.

Key words： Space vector pulse width modulation virtual space vector pulse width modulation three-level neutral-point-clamped converter zero sequence injection neutral-point current

Received: 11 September 2017 Published: 29 January 2019

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TM464

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	Chen Xi
	Huang Shenghua
	Li Bingzhang
	Wu Fang

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Chen Xi,Huang Shenghua,Li Bingzhang等. A Novel Zero Sequence Injection Scheme for Three-Level NPC Converters Considering Neutral-Point Potential Balance[J]. Transactions of China Electrotechnical Society, 2019, 34(2): 337-348.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.171299 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I2/337

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