A sub-circuit SPICE model of a MOSFET for low temperature operation is presented.Two resistors are introduced for the freeze-out effect,and the explicit behavioral models are developed for them.The model can be used i...A sub-circuit SPICE model of a MOSFET for low temperature operation is presented.Two resistors are introduced for the freeze-out effect,and the explicit behavioral models are developed for them.The model can be used in a wide temperature range covering both cryogenic temperature and regular temperatures.展开更多
基于传统半桥子模块(half bridge sub-module,HBSM)的模块化多电平换流器(modular multilevel converter,MMC)无法阻断直流侧短路故障电流,该故障电流降低了MMC高压直流输电系统(MMC based high voltage direct current,MMC-HVDC)的可...基于传统半桥子模块(half bridge sub-module,HBSM)的模块化多电平换流器(modular multilevel converter,MMC)无法阻断直流侧短路故障电流,该故障电流降低了MMC高压直流输电系统(MMC based high voltage direct current,MMC-HVDC)的可靠性。以2个HBSM为基本结构,研究设计一种能够有效阻断直流故障电流的新型旁路型子模块,即二极管钳位型双半桥子模块(diode clamp dual half bridge sub-module,DCDHBSM)。相较于具备直流短路电流阻断能力的其他子模块,所提DCDHBSM所需功率器件较少,运行损耗较低。此外,还设计适用于DCDHBSM的直流故障穿越策略,利用排序算法均衡了故障后的子模块电容电压。MATLAB/Simulink和物理仿真试验结果均证明了装配所提DCDHBSM的MMC在快速阻断直流故障电流及实现故障穿越等方面的有效性。展开更多
基金Project supported by the Natural Science Foundation of Jiangsu Province,China(NoBK2008287)the Advanced Research of National Natural Science Foundation of Southeast University,China(NoXJ2008312)
文摘A sub-circuit SPICE model of a MOSFET for low temperature operation is presented.Two resistors are introduced for the freeze-out effect,and the explicit behavioral models are developed for them.The model can be used in a wide temperature range covering both cryogenic temperature and regular temperatures.
文摘基于传统半桥子模块(half bridge sub-module,HBSM)的模块化多电平换流器(modular multilevel converter,MMC)无法阻断直流侧短路故障电流,该故障电流降低了MMC高压直流输电系统(MMC based high voltage direct current,MMC-HVDC)的可靠性。以2个HBSM为基本结构,研究设计一种能够有效阻断直流故障电流的新型旁路型子模块,即二极管钳位型双半桥子模块(diode clamp dual half bridge sub-module,DCDHBSM)。相较于具备直流短路电流阻断能力的其他子模块,所提DCDHBSM所需功率器件较少,运行损耗较低。此外,还设计适用于DCDHBSM的直流故障穿越策略,利用排序算法均衡了故障后的子模块电容电压。MATLAB/Simulink和物理仿真试验结果均证明了装配所提DCDHBSM的MMC在快速阻断直流故障电流及实现故障穿越等方面的有效性。
