双有源桥(dual active bridge,DAB)DC-DC变换器在其控制的灵活性与分析的简便性之间存在不可规避的矛盾,即控制自由度越高,分析越复杂。针对这一问题,该文提出从基础电路解析的角度对DAB的工作模式进行重塑,从而在提高其控制自由度的同...双有源桥(dual active bridge,DAB)DC-DC变换器在其控制的灵活性与分析的简便性之间存在不可规避的矛盾,即控制自由度越高,分析越复杂。针对这一问题,该文提出从基础电路解析的角度对DAB的工作模式进行重塑,从而在提高其控制自由度的同时降低分析的难度。首先,根据实际开关电路的特点,对单移相控制(single phase shift,SPS)下DAB的所有工作模态进行分析与重新定义,并基于模态分析对回流功率产生的电路本质进行解释。其次,详细阐述从模态角度抑制回流功率的分析方法。所采用的方法简化了DAB工作过程与功率传输特性的分析,对降低工程分析与设计难度具有较好的价值。最后仿真与实验验证分析方法的正确性。展开更多
High efficiency and fast dynamic response are two main control objectives for dual active bridge(DAB)DC-DC converters. Traditional extended phase shift(EPS)control can significantly enhance the conversion efficiency o...High efficiency and fast dynamic response are two main control objectives for dual active bridge(DAB)DC-DC converters. Traditional extended phase shift(EPS)control can significantly enhance the conversion efficiency of DAB DC-DC converters by reducing current stress;however, it cannot fulfill fast dynamic response requirements. In this paper, a novel hybrid control scheme consisting of EPS control and direct power control(DPC),named as EPS-DPC, is proposed. EPS-DPC control has salient features in both efficiency and dynamic performance. In order to verify the outstanding performance of the proposed EPS-DPC scheme, an experimental comparison was carried out on a scale-down DAB DC-DC converter among several control strategies, including single phase shift control with traditional voltage-loop(SPS-TVL), EPS control with traditional voltage-loop(EPSVTL), and EPS-DPC. Experimental results have been high consistent with theoretical analysis, and verified these advantages of the proposed EPS-DPC scheme.展开更多
为了提高拓展移相控制的双有源桥DAB(dual active bridge)DC-DC变换器的电压动态响应性能,降低系统的电流应力,利用使电流应力最小的优化相移比与输出电压之间的关系,提出了一种将电压动态矩阵控制DMC(dynamic matrix control)算法与变...为了提高拓展移相控制的双有源桥DAB(dual active bridge)DC-DC变换器的电压动态响应性能,降低系统的电流应力,利用使电流应力最小的优化相移比与输出电压之间的关系,提出了一种将电压动态矩阵控制DMC(dynamic matrix control)算法与变换器电流应力优化方法相结合的控制算法,并从预测模型、滚动优化和反馈校正3个环节详细介绍了DAB的DMC电压预测控制的具体实现过程。最后,将所提控制方法与电压闭环PI控制的拓展移相电流应力优化算法进行了仿真比较。仿真结果表明:该方法不仅减小了电流应力,而且在变换器启动阶段、输入电压突变和负载突变时大大改善了变换器的电压动态响应性能。展开更多
文摘双有源桥(dual active bridge,DAB)DC-DC变换器在其控制的灵活性与分析的简便性之间存在不可规避的矛盾,即控制自由度越高,分析越复杂。针对这一问题,该文提出从基础电路解析的角度对DAB的工作模式进行重塑,从而在提高其控制自由度的同时降低分析的难度。首先,根据实际开关电路的特点,对单移相控制(single phase shift,SPS)下DAB的所有工作模态进行分析与重新定义,并基于模态分析对回流功率产生的电路本质进行解释。其次,详细阐述从模态角度抑制回流功率的分析方法。所采用的方法简化了DAB工作过程与功率传输特性的分析,对降低工程分析与设计难度具有较好的价值。最后仿真与实验验证分析方法的正确性。
基金supported by the National Natural Science Foundation of China(No.51577160)
文摘High efficiency and fast dynamic response are two main control objectives for dual active bridge(DAB)DC-DC converters. Traditional extended phase shift(EPS)control can significantly enhance the conversion efficiency of DAB DC-DC converters by reducing current stress;however, it cannot fulfill fast dynamic response requirements. In this paper, a novel hybrid control scheme consisting of EPS control and direct power control(DPC),named as EPS-DPC, is proposed. EPS-DPC control has salient features in both efficiency and dynamic performance. In order to verify the outstanding performance of the proposed EPS-DPC scheme, an experimental comparison was carried out on a scale-down DAB DC-DC converter among several control strategies, including single phase shift control with traditional voltage-loop(SPS-TVL), EPS control with traditional voltage-loop(EPSVTL), and EPS-DPC. Experimental results have been high consistent with theoretical analysis, and verified these advantages of the proposed EPS-DPC scheme.
文摘为了提高拓展移相控制的双有源桥DAB(dual active bridge)DC-DC变换器的电压动态响应性能,降低系统的电流应力,利用使电流应力最小的优化相移比与输出电压之间的关系,提出了一种将电压动态矩阵控制DMC(dynamic matrix control)算法与变换器电流应力优化方法相结合的控制算法,并从预测模型、滚动优化和反馈校正3个环节详细介绍了DAB的DMC电压预测控制的具体实现过程。最后,将所提控制方法与电压闭环PI控制的拓展移相电流应力优化算法进行了仿真比较。仿真结果表明:该方法不仅减小了电流应力,而且在变换器启动阶段、输入电压突变和负载突变时大大改善了变换器的电压动态响应性能。
