实现模块间的均压均流是保证模块串并联系统正常运行的关键,针对现有均压控制策略大都模块化程度低的问题,将输出电压上翘控制引入输入串联输出串联-双有源桥变换器(Input Series Output Series-Dual Active Bridge,ISOS-DAB)系统.首先,...实现模块间的均压均流是保证模块串并联系统正常运行的关键,针对现有均压控制策略大都模块化程度低的问题,将输出电压上翘控制引入输入串联输出串联-双有源桥变换器(Input Series Output Series-Dual Active Bridge,ISOS-DAB)系统.首先,在DAB变换器小信号建模基础上,结合ISOS拓扑关系和上翘控制,对ISOS-DAB系统进行完整的小信号建模,分析了控制原理及系统稳定性.其次,通过PSIM软件分别对采用校正前后的上翘控制的ISOS-DAB系统进行了仿真分析.最后,设计了两模块ISOS-DAB系统样机,进行了输出电压上翘特性、输入电压突变和负载突变的实验验证.结果表明:仿真和实验结果均验证了本文理论和上翘控制在ISOS-DAB系统中的有效性与稳定性,上翘控制能够保证ISOS-DAB系统在无互联通信条件下实现模块均压,提高了该系统的模块化程度.展开更多
A multicellular DCX （dc-dc transformer） using unregulated cell converters has been proposed for the environmentally friendly data centers. The high speed cell converter with the switching frequency over MHz behaves ...A multicellular DCX （dc-dc transformer） using unregulated cell converters has been proposed for the environmentally friendly data centers. The high speed cell converter with the switching frequency over MHz behaves as an ideal transformer, and this behavior solves the voltage imbalance issue in the multicellular converter topology. The analysis of the unregulated cell converter is conducted by using the state space averaging method, and the operation condition for the ideal transformer is specified. The behavior of the multicellular DCX using the high speed cell converters has been also analyzed, and the voltage imbalance issue among cell converters is discussed quantitatively. A prototype of a 19.2 kW 384 V-384 V multicellular DCX using sixty-four unregulated cell converters is fabricated and the validity of the analyses is verified.展开更多
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
输入串联输出串联(input-series and output-series,ISOS)逆变器系统的控制目标是在实现输入均压的同时,控制输出电压的幅值和相位都相等从而实现输出均压。在已有的输入均压结合输出同角度的三环控制策略的基础上,对系统的控制环,即输...输入串联输出串联(input-series and output-series,ISOS)逆变器系统的控制目标是在实现输入均压的同时,控制输出电压的幅值和相位都相等从而实现输出均压。在已有的输入均压结合输出同角度的三环控制策略的基础上,对系统的控制环,即输入均压环和输出电压环之间的解耦关系进行分析,并在此基础上分别对它们进行具体的参数设计,以使系统具有良好的稳态和动态性能。仿真及实验结果验证了环路间的解耦关系及参数设计的合理性与有效性。展开更多
文摘实现模块间的均压均流是保证模块串并联系统正常运行的关键,针对现有均压控制策略大都模块化程度低的问题,将输出电压上翘控制引入输入串联输出串联-双有源桥变换器(Input Series Output Series-Dual Active Bridge,ISOS-DAB)系统.首先,在DAB变换器小信号建模基础上,结合ISOS拓扑关系和上翘控制,对ISOS-DAB系统进行完整的小信号建模,分析了控制原理及系统稳定性.其次,通过PSIM软件分别对采用校正前后的上翘控制的ISOS-DAB系统进行了仿真分析.最后,设计了两模块ISOS-DAB系统样机,进行了输出电压上翘特性、输入电压突变和负载突变的实验验证.结果表明:仿真和实验结果均验证了本文理论和上翘控制在ISOS-DAB系统中的有效性与稳定性,上翘控制能够保证ISOS-DAB系统在无互联通信条件下实现模块均压,提高了该系统的模块化程度.
文摘A multicellular DCX （dc-dc transformer） using unregulated cell converters has been proposed for the environmentally friendly data centers. The high speed cell converter with the switching frequency over MHz behaves as an ideal transformer, and this behavior solves the voltage imbalance issue in the multicellular converter topology. The analysis of the unregulated cell converter is conducted by using the state space averaging method, and the operation condition for the ideal transformer is specified. The behavior of the multicellular DCX using the high speed cell converters has been also analyzed, and the voltage imbalance issue among cell converters is discussed quantitatively. A prototype of a 19.2 kW 384 V-384 V multicellular DCX using sixty-four unregulated cell converters is fabricated and the validity of the analyses is verified.
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.
文摘输入串联输出串联(input-series and output-series,ISOS)逆变器系统的控制目标是在实现输入均压的同时,控制输出电压的幅值和相位都相等从而实现输出均压。在已有的输入均压结合输出同角度的三环控制策略的基础上,对系统的控制环,即输入均压环和输出电压环之间的解耦关系进行分析,并在此基础上分别对它们进行具体的参数设计,以使系统具有良好的稳态和动态性能。仿真及实验结果验证了环路间的解耦关系及参数设计的合理性与有效性。
