Hybrid Discontinuous Space Vector PWM Strategy for Three-Level Inverters Under Two-Phase Loads Condition

被引:7
|
作者
Zhang, Guozheng [1 ]
Peng, Shihao [2 ]
Geng, Qiang [1 ]
Shi, Tingna [3 ]
Xia, Changliang [1 ,3 ]
机构
[1] Tiangong Univ, Sch Elect & Elect Engn, Tianjin 300387, Peoples R China
[2] Tianjin Univ, Sch Elect & Informat Engn, Tianjin 300072, Peoples R China
[3] Zhejiang Univ, Coll Elect Engn, Zhejiang Prov Key Lab Elect Machine Syst, Hangzhou 310027, Peoples R China
基金
中国国家自然科学基金;
关键词
Inverters; Modulation; Switching loss; Switches; Phase modulation; Harmonic distortion; Topology; Discontinuous modulation; three-level inverter; two-phase loads; NEUTRAL-POINT VOLTAGE; LOSSES;
D O I
10.1109/TPEL.2021.3105416
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The output performance of three-level inverters will be deteriorated under two-phase loads condition if conventional discontinuous PWM (DPWM) strategies are adopted. To solve the above issue, the amplitude and the phase angle of basic voltage vectors are modified in this article. Accordingly, sectors and triangles of the space vector diagram are reconsidered, duty cycles of basic vectors synthesized the reference vector are recalculated. And then four types of DPWM applicable for two-phase load are put forward. Although the harmonic distortion of the output waveform is reduced, discontinuous intervals are not optimum distributed. To further improve the output waveform quality, the amplitude of average current ripple vector is introduced as the evaluation index to redistribute discontinuous intervals of phase voltage in each fundamental period. Then, a hybrid DPWM strategy is presented and the harmonic distortion of the output waveform is minimized. Meanwhile, the neutral-point voltage ripple and the switching loss are also suppressed. The effectiveness of the hybrid DPWM strategy is verified by both simulation and experimental results.
引用
收藏
页码:1711 / 1721
页数:11
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