中国电机工程学报2018，Vol.38Issue(5)：1290-1300,后插2,12.DOI:10.13334/j.0258-8013.pcsee.172116
级联式电力电子变压器协调控制策略
Coordinative Control Strategy for Cascaded Power Electronic Transformer
摘要
Abstract
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.关键词
电力电子变压器/级联H桥整流器/隔离双向DC/DC变换器/直流链电压波动/协调控制/均衡控制Key words
power electronic transformer/cascaded H-bridge rectifier/isolated bidirectional DC/DC converter/DC-link voltage fluctuation/coordinative control/balancing control分类
信息技术与安全科学引用本文复制引用
孙玉巍,李永刚,刘教民,付超,田艳军..级联式电力电子变压器协调控制策略[J].中国电机工程学报,2018,38(5):1290-1300,后插2,12.基金项目
国家科技支撑计划项目(2013BAG24B02). Project supported by National Key Technology Research and Development Program(2013BAG24B02). （2013BAG24B02）
