文章摘要
多电平直流链电力电子变压器控制策略研究
Research on the Control Strategies for the Multi-level DC-link Power Electronic Transformer
投稿时间:2019-06-10  修订日期:2019-07-01
DOI:
中文关键词: 电力电子变压器  直流链  双有源桥  均衡控制
英文关键词: power electronic transformer  DC-link  dual-active-bridge  balance control
基金项目:国家重点研发计划(2018YFB0905804)
作者单位E-mail
张 哲 西安西电电力系统有限公司 390417160@qq.com 
许崇福 西安西电电力系统有限公司  
王弋飞 西安西电电气研究院有限责任公司  
成 勇 西安西电电气研究院有限责任公司  
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中文摘要:
      电力电子变压器直流链两端电路不同的结构和控制策略会造成直流链电压的波动和不稳定。传统控制策略需要大量电流传感器,并且控制链路上的低通滤波器影响了系统的动态响应。本文提出了一种多电平直流链电力电子变压器的控制策略。由串并联功率模块中的半桥电路稳定直流链总输出电压,由DAB电路实现直流链不同模块之间的均压。同时,所提出的控制策略只需要中压直流端口连接电感处的一个电流传感器,所有功率模块均不使用电流传感器,节省了系统的成本。仿真结果验证了所提出控制策略的正确性和有效性。
英文摘要:
      Different structures and control strategies will cause fluctuation and instability for DC-link voltage of the power electronic transformers. Traditional control strategy require a large number of current sensors, and the low-pass filter on the control link affects the dynamic response of the system. A control strategy for the multi-level DC-link power electronic transformer is proposed in this paper. The voltage sharing of DC link between power modules is realized by half-bridge circuit, and the current sharing of output current between modules is realized by DAB circuit. At the same time, the proposed control strategy only needs a current sensor at the inductance of the medium voltage DC port. All power modules do not use current sensors, which saves the cost of the system. The simulation results verify the correctness and effectiveness of the proposed control strategy.
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