Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/ output side in order to obtained ...Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/ output side in order to obtained any given power system specifications. Multi-modular boost haft bridge DC-DC converter in the configuration of input series output parallel has been investigated in this paper. The boost half bridge DC-DC converters are connected in input series output parallel con- figuration in order to achieve equal input voltage sharing and output current sharing between the con- verters. This can be achieved with the help of dynamic control scheme which consists of two loops, a voltage loop and a current loop, for each module. Dynamic behavior of multi-modular converter configuration has been observe by varying the load condition. Moreover, the results obtained through multi-modular converter describe that the system has good dynamic and steady state response. Al- though two converter modules are focused in this paper but it can be modified to any number of modules.展开更多
针对输入串联输出并联双有源桥(dual active bridge,DAB)变换器子模块内部参数不匹配导致的功率不平衡,以及单移相(single phase shift,SPS)控制下变换器工作效率低的问题,该文基于拓展移相(extended phase shift,EPS)控制提出一种扰动...针对输入串联输出并联双有源桥(dual active bridge,DAB)变换器子模块内部参数不匹配导致的功率不平衡,以及单移相(single phase shift,SPS)控制下变换器工作效率低的问题,该文基于拓展移相(extended phase shift,EPS)控制提出一种扰动均压(disturbance voltage sharing,DVS)控制策略。通过建立EPS控制下的电流应力解析模型,求解最优电流应力对应下的内外移相比组合。进一步,设计逐级扰动方案,通过扰动模块的外移相比,对各模块内部参数失配时的输入电压进行补偿。DVS控制策略在实现串并联模块间功率平衡的前提下,降低变换器电流应力,从而提升变换器的工作效率。此外,由于无需在每个控制环路中增设输入电压传感器,系统结构更为简化,硬件成本更低。最后,通过仿真和实验验证了所提控制策略的正确性和有效性。展开更多
移相控制是输入串联输出并联双有源桥(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)变换器一种常见控制方式,针对传统单移相控制存在动态特性和回流功率问题,提出一种基于扩展移相(Extended Phase Shift,EPS)的混合优化...移相控制是输入串联输出并联双有源桥(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)变换器一种常见控制方式,针对传统单移相控制存在动态特性和回流功率问题,提出一种基于扩展移相(Extended Phase Shift,EPS)的混合优化控制技术.首先,基于ISOP-DAB的状态空间平均化方程,分析了EPS控制下ISOP-DAB变换器的回流功率和电流应力.其次,通过电压微分方程离散化,建立了DAB变换器控制量预测模型.最后,结合梯度下降算法(Gradient Descent Algorithm,GDA)进行控制优化,并进行了仿真分析.结果表明:基于EPS的ISOP-DAB变换器混合优化控制策略实现了输入电容电压均衡、输出电压稳定及同时优化回流功率的控制目标.展开更多
随着新能源的大规模利用以及直流配电网的快速发展,直流变压器受到广泛关注.输入串联输出并联-双有源桥DC-DC变换器(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)结构能够有效解决高压大功率的双向传输问题,但面临着模...随着新能源的大规模利用以及直流配电网的快速发展,直流变压器受到广泛关注.输入串联输出并联-双有源桥DC-DC变换器(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)结构能够有效解决高压大功率的双向传输问题,但面临着模块间的均压均流挑战.针对现存均压均流控制方法繁多但缺乏归纳总结的问题,对不同控制方案进行了多方面对比分析.首先,简要介绍了ISOP-DAB的基本结构和功能;其次,结合PSIM仿真分析了控制上完全独立的共同占空比控制、上翘控制;然后综合比较了控制上有耦合的特殊输入均压控制、输出均流控制;最后,对提及的所有控制方法进行了归纳总结,确定了各类方法的可行性及适用范围,对比了其优缺点,以便为ISOP-DAB的控制器设计提供参考.展开更多
文摘Multi-modular system plays an important role in power system architecture because low voltage and low power converters can be connected in any combination parallel or series at input/ output side in order to obtained any given power system specifications. Multi-modular boost haft bridge DC-DC converter in the configuration of input series output parallel has been investigated in this paper. The boost half bridge DC-DC converters are connected in input series output parallel con- figuration in order to achieve equal input voltage sharing and output current sharing between the con- verters. This can be achieved with the help of dynamic control scheme which consists of two loops, a voltage loop and a current loop, for each module. Dynamic behavior of multi-modular converter configuration has been observe by varying the load condition. Moreover, the results obtained through multi-modular converter describe that the system has good dynamic and steady state response. Al- though two converter modules are focused in this paper but it can be modified to any number of modules.
文摘针对输入串联输出并联双有源桥(dual active bridge,DAB)变换器子模块内部参数不匹配导致的功率不平衡,以及单移相(single phase shift,SPS)控制下变换器工作效率低的问题,该文基于拓展移相(extended phase shift,EPS)控制提出一种扰动均压(disturbance voltage sharing,DVS)控制策略。通过建立EPS控制下的电流应力解析模型,求解最优电流应力对应下的内外移相比组合。进一步,设计逐级扰动方案,通过扰动模块的外移相比,对各模块内部参数失配时的输入电压进行补偿。DVS控制策略在实现串并联模块间功率平衡的前提下,降低变换器电流应力,从而提升变换器的工作效率。此外,由于无需在每个控制环路中增设输入电压传感器,系统结构更为简化,硬件成本更低。最后,通过仿真和实验验证了所提控制策略的正确性和有效性。
文摘移相控制是输入串联输出并联双有源桥(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)变换器一种常见控制方式,针对传统单移相控制存在动态特性和回流功率问题,提出一种基于扩展移相(Extended Phase Shift,EPS)的混合优化控制技术.首先,基于ISOP-DAB的状态空间平均化方程,分析了EPS控制下ISOP-DAB变换器的回流功率和电流应力.其次,通过电压微分方程离散化,建立了DAB变换器控制量预测模型.最后,结合梯度下降算法(Gradient Descent Algorithm,GDA)进行控制优化,并进行了仿真分析.结果表明:基于EPS的ISOP-DAB变换器混合优化控制策略实现了输入电容电压均衡、输出电压稳定及同时优化回流功率的控制目标.
文摘随着新能源的大规模利用以及直流配电网的快速发展,直流变压器受到广泛关注.输入串联输出并联-双有源桥DC-DC变换器(Input Series Output Parallel-Dual Active Bridge,ISOP-DAB)结构能够有效解决高压大功率的双向传输问题,但面临着模块间的均压均流挑战.针对现存均压均流控制方法繁多但缺乏归纳总结的问题,对不同控制方案进行了多方面对比分析.首先,简要介绍了ISOP-DAB的基本结构和功能;其次,结合PSIM仿真分析了控制上完全独立的共同占空比控制、上翘控制;然后综合比较了控制上有耦合的特殊输入均压控制、输出均流控制;最后,对提及的所有控制方法进行了归纳总结,确定了各类方法的可行性及适用范围,对比了其优缺点,以便为ISOP-DAB的控制器设计提供参考.
