A novel silicon-on-insulator （SOI） power metM-oxide-semiconductor field effect transistor with an interface-gate （IG SOI） structure is proposed, in which the trench polysificon gate extends into the buried oxide l...A novel silicon-on-insulator （SOI） power metM-oxide-semiconductor field effect transistor with an interface-gate （IG SOI） structure is proposed, in which the trench polysificon gate extends into the buried oxide layer （BOX） at the source side and an IG is formed. Firstly, the IG offers an extra accumulation channel for the carriers. Secondly, the subsidiary depletion effect of the IG results in a higher impurity doping for the drift region. A low specific on-resistance is therefore obtained under the condition of a slightly enhanced breakdown voltage for the IG SOI. The influences of structure parameters on the device performances are investigated. Compared with the conventional trench gate SOI and lateral planar gate SOI, the specific on-resistances of the IG SOI are reduced by 36.66% and 25.32% with the breakdown voltages enhanced by 2.28% and 10.83% at the same SOI layer of 3 μm, BOX of 1 μm, and half-cell pitch of 5.5 μm, respectively.展开更多
For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization...For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization,achieving carbon neutrality in a short period necessitates tough changes.This paper briefly introduces energy and electricity scenarios and analyzes the challenges based on the current power system in China.Moreover,it summarizes the six characteristics of China’s future power grid and highlights some partially representative projects in the country.展开更多
面向“碳达峰、碳中和”目标,发展半波长输电技术可为构建以新能源为主体的新型电力系统提供能源保障。半波长技术因其输电距离远、经济性好等独特优势,在“西电东送”能源战略中有较好的应用前景。针对输电线路自然长度不足工频半波长...面向“碳达峰、碳中和”目标,发展半波长输电技术可为构建以新能源为主体的新型电力系统提供能源保障。半波长技术因其输电距离远、经济性好等独特优势,在“西电东送”能源战略中有较好的应用前景。针对输电线路自然长度不足工频半波长现象以及固定调谐的不足,文章提出一种变阻抗型可控调谐方法,基于可控串补(thyristor controlled series compensator,TCSC)阻抗控制策略构造可微调的调谐电感,基于电容三级投切策略构造可分级的调谐电容。对可控调谐可行性、故障过电压特征以及串补过压抑制进行仿真分析。结果表明,可控调谐能够消除电气长度误差,使线路保持半波长特性,线路补偿效果与可控调谐长度相关。展开更多
电力系统低碳转型,构建安全高效和灵活可靠的配电网为基础的新型电力系统将对我国“碳达峰、碳中和”目标的实现起到关键作用。文中以低压直流(low voltage direct current,LVDC)配网系统为研究对象,针对配电网低压侧的接地故障问题,提...电力系统低碳转型,构建安全高效和灵活可靠的配电网为基础的新型电力系统将对我国“碳达峰、碳中和”目标的实现起到关键作用。文中以低压直流(low voltage direct current,LVDC)配网系统为研究对象,针对配电网低压侧的接地故障问题,提出了一种采用IGBT构造投切旁路的人体保护方法。文中建立接地故障等效模型并进行理论分析,通过故障阈值识别判据产生保护人体的投切旁路信号,并对不同类型的接地故障进行区分,考虑多支路故障情况对旁路投切保护判据的影响,将故障值范围进行划分,进一步提出了旁路投切的分级保护方案,搭建实物模型对保护方法进行验证。实验结果表明所提保护方法能保护人体安全,具有灵敏性好,安全可控的优点,能显著提高配网系统的运行稳定性。展开更多
Traditional hydraulic brake systems require a complex system of pipelines between an aircraft engine driven pump（EDP） and brake actuators, which increases the weight of the aircraft and may even cause serious vibrat...Traditional hydraulic brake systems require a complex system of pipelines between an aircraft engine driven pump（EDP） and brake actuators, which increases the weight of the aircraft and may even cause serious vibration and leakage problems. In order to improve the reliability and safety of more electric aircraft（MEA）, this paper proposes a new integrated self-powered brake system（ISBS） for MEA. It uses a hydraulic pump geared to the main wheel to recover a small part of the kinetic energy of a landing aircraft. The recovered energy then serves as the hydraulic power supply for brake actuators. It does not require additional hydraulic source, thus removing the pipelines between an EDP and brake actuators. In addition, its self-powered characteristic makes it possible to brake as usual even in an emergency situation when the airborne power is lost. This paper introduces the working principle of the ISBS and presents a prototype. The mathematical models of a taxiing aircraft and the ISBS are established. A feedback linearization control algorithm is designed to fulfill the anti-skid control. Simulations are carried out to verify the feasibility of the ISBS, and experiments are conducted on a ground inertia brake test bench. The ISBS presents a good performance and provides a new potential solution in the field of brake systems for MEA.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61404014 and 61405018the Fundamental Research Funds for the Central Universities under Grant Nos CDJZR12160003 and 106112014CDJZR168801
文摘A novel silicon-on-insulator （SOI） power metM-oxide-semiconductor field effect transistor with an interface-gate （IG SOI） structure is proposed, in which the trench polysificon gate extends into the buried oxide layer （BOX） at the source side and an IG is formed. Firstly, the IG offers an extra accumulation channel for the carriers. Secondly, the subsidiary depletion effect of the IG results in a higher impurity doping for the drift region. A low specific on-resistance is therefore obtained under the condition of a slightly enhanced breakdown voltage for the IG SOI. The influences of structure parameters on the device performances are investigated. Compared with the conventional trench gate SOI and lateral planar gate SOI, the specific on-resistances of the IG SOI are reduced by 36.66% and 25.32% with the breakdown voltages enhanced by 2.28% and 10.83% at the same SOI layer of 3 μm, BOX of 1 μm, and half-cell pitch of 5.5 μm, respectively.
基金supported by the SGCC(State Grid Corporation of China)technology project Analysis of System Stability Region and Control Strategy Based on Lyapunov Method(No.5100-202155304A-0-0-00).
文摘For China,one of its most important commitments is to realize its“3060”targets of achieving a CO_(2) emission peak by 2030 and carbon neutrality by 2060.However,for a developing country with heavy carbon utilization,achieving carbon neutrality in a short period necessitates tough changes.This paper briefly introduces energy and electricity scenarios and analyzes the challenges based on the current power system in China.Moreover,it summarizes the six characteristics of China’s future power grid and highlights some partially representative projects in the country.
文摘面向“碳达峰、碳中和”目标,发展半波长输电技术可为构建以新能源为主体的新型电力系统提供能源保障。半波长技术因其输电距离远、经济性好等独特优势,在“西电东送”能源战略中有较好的应用前景。针对输电线路自然长度不足工频半波长现象以及固定调谐的不足,文章提出一种变阻抗型可控调谐方法,基于可控串补(thyristor controlled series compensator,TCSC)阻抗控制策略构造可微调的调谐电感,基于电容三级投切策略构造可分级的调谐电容。对可控调谐可行性、故障过电压特征以及串补过压抑制进行仿真分析。结果表明,可控调谐能够消除电气长度误差,使线路保持半波长特性,线路补偿效果与可控调谐长度相关。
文摘电力系统低碳转型,构建安全高效和灵活可靠的配电网为基础的新型电力系统将对我国“碳达峰、碳中和”目标的实现起到关键作用。文中以低压直流(low voltage direct current,LVDC)配网系统为研究对象,针对配电网低压侧的接地故障问题,提出了一种采用IGBT构造投切旁路的人体保护方法。文中建立接地故障等效模型并进行理论分析,通过故障阈值识别判据产生保护人体的投切旁路信号,并对不同类型的接地故障进行区分,考虑多支路故障情况对旁路投切保护判据的影响,将故障值范围进行划分,进一步提出了旁路投切的分级保护方案,搭建实物模型对保护方法进行验证。实验结果表明所提保护方法能保护人体安全,具有灵敏性好,安全可控的优点,能显著提高配网系统的运行稳定性。
基金supports from the Science and Technology on Aircraft Control Laboratory and Aviation Key Laboratory of Scienceco-supported by the National Natural Science Foundation of China(No.51475020)the National Key Basic Research Program of China(No.2014CB046401)
文摘Traditional hydraulic brake systems require a complex system of pipelines between an aircraft engine driven pump（EDP） and brake actuators, which increases the weight of the aircraft and may even cause serious vibration and leakage problems. In order to improve the reliability and safety of more electric aircraft（MEA）, this paper proposes a new integrated self-powered brake system（ISBS） for MEA. It uses a hydraulic pump geared to the main wheel to recover a small part of the kinetic energy of a landing aircraft. The recovered energy then serves as the hydraulic power supply for brake actuators. It does not require additional hydraulic source, thus removing the pipelines between an EDP and brake actuators. In addition, its self-powered characteristic makes it possible to brake as usual even in an emergency situation when the airborne power is lost. This paper introduces the working principle of the ISBS and presents a prototype. The mathematical models of a taxiing aircraft and the ISBS are established. A feedback linearization control algorithm is designed to fulfill the anti-skid control. Simulations are carried out to verify the feasibility of the ISBS, and experiments are conducted on a ground inertia brake test bench. The ISBS presents a good performance and provides a new potential solution in the field of brake systems for MEA.
