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The On-site Verification of Key Technologies for Kunbei-Liuzhou-Longmen Hybrid Multi-terminal Ultra HVDC project

CSEE Journal of Power and Energy Systems 2022年第5期8卷 1281-1289页

作者： Hong Rao Changyue Zou Shukai Xu Xipeng Cai Yan Li Xiaobin Zhao Yuebin Zhou Yu Yang Wei Wei Jun Chen Tianliu Wei Research Institute China Southern Power GridHuangpu DistrictGuangzhou 510080China China Southern Power Grid Huangpu DistrictGuangzhou 510080China

Hybrid high voltage direct current transmission(Hybrid HVDC)is a new type of HVDC technology developed in recent *** combines the characteristics of large-capacity and low cost of the line commutated converters(LCC)and non-commutation failure and dynamic reactive power support of voltage sourced converters(VSCs)in one HVDC *** has technical advantages in the fields of unidirectional power transmission and in the application of improving the stability of multi-infeed HVDCs,giving it broad application *** Kunbei-Liuzhou-Longmen(KBL)project is the first hybrid ultra HVDC *** was put into service on Dec.27th,*** paper introduces the KBL project,analyzes the operation characteristics of hybrid HVDC system,and provides on-site verification of KBL project,including operation of LCC-VSC hybrid system,ultra-high voltage VSC technology using the series of two valve groups,the DC fault ride-though of hybrid VSC without using DC breaker,the connection and disconnection of a third station,and etc.

关键词： DC overhead lines hybrid HVDC LCC-HVDC VSC-HVDC VSC topology on-site commissioning

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Gradient CNT/PVDF piezoelectric composite with enhanced force-electric coupling for soccer training

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Nano Research 2023年第8期16卷 11312-11319页

作者： Wanghong Zeng Weili Deng Tao Yang Shenglong Wang Yue Sun Jieling Zhang Xiarong Ren Long Jin Lihua Tang Weiqing Yang Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Department of Mechanical and Mechatronics Engineering University of AucklandAuckland 1010New Zealand Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China

Real-time monitoring of ball–shoe interactions can provide essential information for high-quality instruction in personalized soccer training,yet existing monitoring systems struggle to reflect specific forces,loci,and durations of ***,we design a self-powered piezoelectric sensor constructed by the gradient carbon nanotube/polyvinylidene fluoride(CNT/PVDF)composite to monitor the interactions between the ball and the ***-dimensional Raman mapping demonstrates the gradient structure of CNT/PVDF prepared by programmable electrospinning combined with a hot *** from the synergistic effect of local polarization caused by the enrichment of CNT and the reduced diffusion of silver patterns in gradient structure,the as-prepared composite exhibits enhanced force-electric coupling with an excellent sensitivity of 80 mV/N and durability over 15,000 *** this basis,we conformally attach a 3×3 sensor array to a soccer shoe,enabling real-time acquisition of kick position and contact force,which could provide quantitative assessment and personalize guidance for the training of soccer *** self-powered piezoelectric sensor network system offers a promising paradigm for wearable monitoring under strong impact forces.

关键词： mechanical and electrical performance pressure sensor carbon nanotube/polyvinylidene fluoride(CNT/PVDF)composite soccer training

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