Full-Bridge Modular Multilevel Converter(FBMMC) has strong ability to ride through serious DC faults,thus it is very suitable for multi-terminal flexible HVDC applications.However,no references have reported the locat...Full-Bridge Modular Multilevel Converter(FBMMC) has strong ability to ride through serious DC faults,thus it is very suitable for multi-terminal flexible HVDC applications.However,no references have reported the locating and isolating of DC faults and corresponding DC faults ride-through capability evaluation index.This paper introduces the topology mechanism of FBMMC and its loss reduction operation mode,theoretically certifies that the universal decoupled control strategy of Voltage Source Converter(VSC) and the similar modulation strategies of Half-Bridge MMC(HBMMC) can be applied to FBMMC for constructing complete closed-loop control system.On the basis of the existing DC faults locating and isolating schemes of 2-level VSC based Multi-Terminal HVDC(VSC-MTDC) system and the particularity of FBMMC,this paper proposes the DC faults wire selection "handshaking" method of the FBMMC-MTDC system,and proposes the DC Fault Ride-Through Capability Index(DFRTI) for evaluating the DC faults suppressing capability of the VSC-MTDC systems,including FBMMC-MTDC.Simulations of FBMMC-MTDC in PSCAD/EMTDC validate the correctness and effectiveness of the proposed control strategy and evaluation index.展开更多
提出了一种新型的全桥移相零电压零电流变换器拓扑结构。新的变换器通过导通副边辅助电路中的钳位MOSFET,使得滤波电感两端电压被钳位为零,输出滤波电容的电压全部作用在原边漏感上,实现原边电流的迅速复位,从而创造出良好的滞后臂零电...提出了一种新型的全桥移相零电压零电流变换器拓扑结构。新的变换器通过导通副边辅助电路中的钳位MOSFET,使得滤波电感两端电压被钳位为零,输出滤波电容的电压全部作用在原边漏感上,实现原边电流的迅速复位,从而创造出良好的滞后臂零电流开关(zero current switching,ZCS)条件。新拓扑在有效零电压零电流开关(zero voltage zero current switching,ZVZCS)范围,最大占空比等方面都优于其它拓扑结构。该文详细分析了新拓扑的工作过程和各项特性,并试制样机,验证了理论分析的正确性和新拓扑的有效性。理论分析和实验结果都证实了新拓扑非常适合中大功率场合应用。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51177042)the Key Project of the National Twelfth FiveYear Research Program of China (Grant No. 2010BAA01B01)
文摘Full-Bridge Modular Multilevel Converter(FBMMC) has strong ability to ride through serious DC faults,thus it is very suitable for multi-terminal flexible HVDC applications.However,no references have reported the locating and isolating of DC faults and corresponding DC faults ride-through capability evaluation index.This paper introduces the topology mechanism of FBMMC and its loss reduction operation mode,theoretically certifies that the universal decoupled control strategy of Voltage Source Converter(VSC) and the similar modulation strategies of Half-Bridge MMC(HBMMC) can be applied to FBMMC for constructing complete closed-loop control system.On the basis of the existing DC faults locating and isolating schemes of 2-level VSC based Multi-Terminal HVDC(VSC-MTDC) system and the particularity of FBMMC,this paper proposes the DC faults wire selection "handshaking" method of the FBMMC-MTDC system,and proposes the DC Fault Ride-Through Capability Index(DFRTI) for evaluating the DC faults suppressing capability of the VSC-MTDC systems,including FBMMC-MTDC.Simulations of FBMMC-MTDC in PSCAD/EMTDC validate the correctness and effectiveness of the proposed control strategy and evaluation index.
文摘提出了一种新型的全桥移相零电压零电流变换器拓扑结构。新的变换器通过导通副边辅助电路中的钳位MOSFET,使得滤波电感两端电压被钳位为零,输出滤波电容的电压全部作用在原边漏感上,实现原边电流的迅速复位,从而创造出良好的滞后臂零电流开关(zero current switching,ZCS)条件。新拓扑在有效零电压零电流开关(zero voltage zero current switching,ZVZCS)范围,最大占空比等方面都优于其它拓扑结构。该文详细分析了新拓扑的工作过程和各项特性,并试制样机,验证了理论分析的正确性和新拓扑的有效性。理论分析和实验结果都证实了新拓扑非常适合中大功率场合应用。
