Coordinative Control Strategy for Cascaded Power Electronic Transformer

被引：0
|
作者：
Sun Y. [1 ]
Li Y. [1 ]
Liu J. [1 ]
Fu C. [1 ]
Tian Y. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Baoding, 071003, Hebei Province
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2018年 / 38卷 / 05期
关键词：
Balancing control; Cascaded H-bridge rectifier; Coordinative control; DC-link voltage fluctuation; Isolated bidirectional DC/DC converter; Power electronic transformer;
D O I：
10.13334/j.0258-8013.pcsee.172116
中图分类号：
学科分类号：
摘要：
The two-stage topology, cascaded H-bridge (CHB) rectifier with isolated bidirectional DC/DC converter (IBDC), is widely used in power electronic transformer (PET). Serving as the energy buffer, the dc-link capacitors will engage serious power unbalance when the dynamic behaviors of CHB and IBDC are quite different. This power unbalance will cause the consequence of dc-link voltage fluctuations, and system stability degradation. To solve this problem, a coordinative control strategy was proposed, which assigns the responsibilities of dc-link voltage control and output voltage control to the CHB and IBDC stages coordinately. By analyzing the DC-link voltage fluctuation response under load interference in the view of frequency -response method, as well as stability analysis, the superiority of the proposed coordinative control over the conventional independent one has been demonstrated. In addition, to guarantee dc-link voltage balance among sub-modules, the balancing controller was designed in the IBDC stage. Then by combining the balancing control with the coordinative control, a compact overall control strategy of PET was obtained. The correctness and effectiveness of the proposed method have been validated by both simulations and experiments. © 2018 Chin. Soc. for Elec. Eng.
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页码：1290 / 1300
页数：10
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