Optimal loss distribution control strategy based on a T-type three-level converter

被引：0
|
作者：
Zhou S. [1 ]
Ma F. [2 ]
Xu M. [3 ]
Ding H. [2 ]
Huang G. [2 ]
Zhang C. [2 ]
Wang J. [2 ]
机构：
[1] Zhenjiang Power Supply Branch of State Grid Jiangsu Electric Power Co., Ltd., Zhenjiang
[2] College of Electrical and Information Engineering, Hunan University, Changsha
[3] CHINA HUANENG Hunan Branch, Changsha
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 24期
基金：
中国国家自然科学基金;
关键词：
discontinuous modulation; loss balance; midpoint voltage control; T-type three-level converter;
D O I：
10.19783/j.cnki.pspc.230625
中图分类号：
学科分类号：
摘要：
In conventional modulation strategy, there is a serious problem of uneven loss between inner and outer switches of a T-type three-level converter. When the converter’s modulation ratio is below 0.57, the inner switch temperature rise is significantly higher than that of the outer switch, and this issue is even worse during a low voltage ride through (LVRT) operation. It will threaten the long-term reliable operation of the converter. Therefore, a discontinuous pulse width modulation strategy based on optimal loss distribution is proposed. This adopts new switching sequences in corresponding regions of the space vector diagram. The clamping mode of each phase is to be clamped to the positive or negative pole so as to redistribute the current in outer and inner switches. This new modulation strategy adopts a five-stage wave mode. This can not only effectively improve the loss distribution of the inner and outer switches, but also enhance the efficiency of the converter. The balance of midpoint voltage is maintained through redundant small vector complementary sequences. The new modulation strategy has a unified carrier-modulation method. Finally, the effectiveness of the proposed loss distribution modulation strategy is verified by electrical-thermal co-simulation. © 2023 Power System Protection and Control Press. All rights reserved.
引用
收藏
页码：66 / 76
页数：10
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