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
This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter(qZIBDC)for renewable energy applications.The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both side...This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter(qZIBDC)for renewable energy applications.The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides,so the converter works as buck/boost converter from either side.It has a wider input/output voltage operating range,soft-switching capabilities without additional devices,and higher boost capability than a traditional dual active bridge circuit.Apart from that,shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter.Due to the symmetrical structure of the circuit,there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter.The operating principle and control strategy of the proposed converter are presented.Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy.展开更多
氢能双源机车使用氢燃料电池供电,与传统内燃机车和电力机车相比,不仅更加安全环保,而且运行噪声小、成本低,维护也更加方便。双向DC/DC变流器作为氢能系统的关键部件,用于将燃料电池电压转换为系统所需的工作电压,但既有双向DC/DC变流...氢能双源机车使用氢燃料电池供电,与传统内燃机车和电力机车相比,不仅更加安全环保,而且运行噪声小、成本低,维护也更加方便。双向DC/DC变流器作为氢能系统的关键部件,用于将燃料电池电压转换为系统所需的工作电压,但既有双向DC/DC变流器一般采用非隔离斩波电路,存在不能实现功率流动方向的在线切换、不能冗余工作等缺点,从而限制了其在氢能双源机车上的应用。为此,文章设计了一种双向隔离DC/DC变流器,其采用双有源桥(dual active bridges,DAB)电路,软开关范围宽,变换效率高,并可实现能量的双向流动和传输方向的在线切换,具备电气隔离和热冗余功能。文章具体阐述了一种440 kW双向隔离DC/DC变流器的主电路设计和控制策略,提出了一种以电感电流峰值最小化作为优化目标的储能电感设计方法。原理仿真和试验结果验证了该设计的可行性,变流器效率最高可达96%,成功实现了大功率双向隔离变流器在氢能机车的装车应用。展开更多
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This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter(qZIBDC)for renewable energy applications.The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides,so the converter works as buck/boost converter from either side.It has a wider input/output voltage operating range,soft-switching capabilities without additional devices,and higher boost capability than a traditional dual active bridge circuit.Apart from that,shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter.Due to the symmetrical structure of the circuit,there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter.The operating principle and control strategy of the proposed converter are presented.Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy.
文摘氢能双源机车使用氢燃料电池供电,与传统内燃机车和电力机车相比,不仅更加安全环保,而且运行噪声小、成本低,维护也更加方便。双向DC/DC变流器作为氢能系统的关键部件,用于将燃料电池电压转换为系统所需的工作电压,但既有双向DC/DC变流器一般采用非隔离斩波电路,存在不能实现功率流动方向的在线切换、不能冗余工作等缺点,从而限制了其在氢能双源机车上的应用。为此,文章设计了一种双向隔离DC/DC变流器,其采用双有源桥(dual active bridges,DAB)电路,软开关范围宽,变换效率高,并可实现能量的双向流动和传输方向的在线切换,具备电气隔离和热冗余功能。文章具体阐述了一种440 kW双向隔离DC/DC变流器的主电路设计和控制策略,提出了一种以电感电流峰值最小化作为优化目标的储能电感设计方法。原理仿真和试验结果验证了该设计的可行性,变流器效率最高可达96%,成功实现了大功率双向隔离变流器在氢能机车的装车应用。
