Modulation wave offset adjustment by dynamic search to balance neutral-point voltage of three-level SPWM inverter

被引：0
|
作者：
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing [1 ]
210094, China
不详 [2 ]
210094, China
机构：
[1] School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing
[2] School of Automation, Nanjing University of Science and Technology, Nanjing
来源：
Dianli Zidonghua Shebei Electr. Power Autom. Equip. | / 12卷 / 73-79期
关键词：
Dynamic search; Modulation-waveoffset; Neutral-point voltage balancing; Sinusoidal pulse width modulation; Three-level inverter;
D O I：
10.16081/j.issn.1006-6047.2015.12.011
中图分类号：
学科分类号：
摘要：
Aiming at the neutral-point voltage imbalance of three-level inverter, a SPWM(Sinusoidal Pulse Width Modulation) method is proposed, which adjusts the DSMO(Dynamic Searching Modulation-wave Offset). It samples the neutral-point voltage, online calculates the range of modulation wave offset adjustment coefficient according to the modulation ratio, output current amplitude and output power factor, and searches the optimal coefficient to dynamically adjust the modulation wave offset for balancing the neutral-point voltage in different load conditions. Compared with the variable carrier amplitude method, the proposed method has better dynamic response, smaller steady-state error and nicer output waveform quality. The simulative result proves the correctness of theoretical analysis and the experimental result of a DSP-CPLD-based NPC(Neutral Point Clamped) three-level inverter verifies the feasibility and effectiveness of the proposed method. © 2015, Electric Power Automation Equipment Press. All right reserved.
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页码：73 / 79
页数：6
相关论文
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