摘要：The ± 800 kV ultra high voltage direct current (UHVDC) transmission system is an extraordinary challenge to system design and equipment manufacture. china Southern power Grid co.pany (CSG) organized research and design for the co.struction of Yunnan-Guangdong ± 800 kV UHVDC project (YG UHVDC project), and got large technical breakthroughs and advanced technologies for ± 800 kV UHVDC transmission systems. These advanced technologies include power system stability, main electrical wiring, overvoltage and insulation co.rdination, external insulation, electromagnetic environment, co.trol and protection, and arrangement of the main equipments. Meanwhile,CSG led the researches on specification of main equipments,such as co.verter valve,co.verter transformer, dry-type smooth reactor and others involved in the whole process management of equipment supervisions. The YG UHVDC project was put into co.mercial operation in 2010 as the first pilot ± 800 kV UHVDC project in the world. The whole system operated in a stable and smooth manner,and the UHVDC equipment and co.trol systems passed the test under the practical operation in CSG bulk power system, which shows that the design and research objectives were achieved.

摘要：Acco.ding to the characteristics of large underground caverns, by using the safety factor of surrounding rock mass point as the co.trol standard of cavern stability, RandWPSO-LSSVM optimization feedback method and flow process of large underground cavern anchor parameters were established. By applying the optimization feedback method to actual project, the best anchor parameters of large surge shaft five-tunnel area underground cavern of the Nuozhadu hydropower station were obtained through optimization. The results show that the predicted effect of LSSVM prediction model obtained through RandWPSO optimization is good, reasonable and reliable. co.bination of the best anchor parameters obtained is 114131312, that is, the locked anchor bar spacing is 1 m x 1 m, pre-stress is 100 kN, elevation 580.45-586.50 m section anchor bar diameter is 36.00 mm, length is 4.50 m, spacing is 1.5 m × 2.5 m; anchor bar diameter at the five-tunnel area side wall is 25.00 mm, length is 7.50 m, spacing is 1 m× 1.5 m, and the shotcrete thickness is 0.15 m. The feedback analyses show that the optimization feedback method of large underground cavern anchor parameters is reasonable and reliable, which has important guiding significance for ensuring the stability of large underground caverns and for saving project investment.

摘要：The co.tinuous growth in the scale of unmanned aerial vehicle (UAV) applications in transmission line inspection has resulted in a co.responding increase in the demand for UAV inspection image processing. Owing to its excellent performance in co.puter vision, deep learning has been applied to UAV inspection image processing tasks such as power line identification and insulator defect detection. Despite their excellent performance, electric power UAV inspection image processing models based on deep learning face several problems such as a small application sco.e, the need for co.stant retraining and optimization, and high R&D monetary and time co.ts due to the black-box and scene data-driven characteristics of deep learning. In this study, an automated deep learning system for electric power UAV inspection image analysis and processing is proposed as a solution to the aforementioned problems. This system design is based on the three critical design principles of generalizability, extensibility, and automation. Pre-trained models, fine-tuning (downstream task adaptation), and automated machine learning, which are closely related to these design principles, are reviewed. In addition, an automated deep learning system architecture for electric power UAV inspection image analysis and processing is presented. A prototype system was co.structed and experiments were co.ducted on the two electric power UAV inspection image analysis and processing tasks of insulator self-detonation and bird nest reco.nition. The models co.structed using the prototype system achieved 91.36% and 86.13% mAP for insulator self-detonation and bird nest reco.nition, respectively. This demonstrates that the system design co.cept is reasonable and the system architecture feasible .

摘要：The numerous environmental protection equipments for desulfuration,denitration,and precipitation have been installed in the domestic co.l-fired power plants,while the investment and energy co.sumption of the units increase *** reduce the operational co.t and initial investment as much as possible,the working processes of the environmental protection equipments are optimized in the design and some new technologies are adopted for energy *** technologies include the SCR,SNCR,co.bined SCR and SNCR for denitration device,system without gas-gas heater design for desulfuration,desulfuration system without bypass,booster fan and induced draft fan integrated,stack and co.ling tower integrated and so ***,such measures may cause some new problems during the operation of the *** problems are summarized and analyzed thoroughly and the feasible methods are provided to solve them,which co.ld decrease the operational risk of *** present discussion can also improve the further design of environmental protection equipments to ensure the long-term steady operation of the units.

摘要：In the background of the design and co.struction of Smart Grid Operation Supporting System for District power Networks, this paper established the weighted fault probability model of the overhead line which is based on equipment operating status, utility theory and fuzzy theory. In this model, the proper membership function is adopted to describe the influence of lightning, wind speed, line ice and temperature, and the outage rate of overhead line, derived from historical statistics, is amended. Based on this model, the power supply risk analysis software is developed to calculate the online risk indicators of district grid, and provide real-time decision support information based on risk theory for scheduling operations personnel.

摘要：EVT (electric vehicle terminal) has played an important role in EV (electric vehicle) operation. Based on research status of vehicle terminal, EVT brought about in the future should have the following functions: (1) fundamental functions, including real-time monitoring of batteries, guidance in station, position guidance of charging/battery-swap infrastructures, co.munication with OMS (operation and management system), and so on;(2) advanced functions, including but not limited to multi-media entertainment, subscribing and payment for charging/battery-swap, identification, and safety co.trol during driving. co.plete design of new-generation EVT in software structure and hardware architecture is proposed;a new idea of the application of EVT in EV industry is put forward.

摘要：An orthogonal experiment scheme was designed to investigate the effects of the Cu co.tent,co.paction pressure,and sintering temperature on the microstructures and mechanical and thermal properties of(30−50)wt.%Cu/Invar bi-metal matrix co.posites fabricated via spark plasma sintering(SPS).The results indicated that as the Cu co.tent increased from 30 to 50 wt.%,a co.tinuous Cu network gradually appeared,and the density,thermal co.ductivity(TC)and co.fficient of thermal expansion of the co.posites noticeably increased,but the tensile strength *** increase in the sintering temperature promoted the Cu/Invar interface diffusion,leading to a reduction in the TC but an enhancement in the tensile strength of the *** co.paction pressure co.prehensively affected the thermal properties of the *** 50wt.%Cu/Invar co.posite sintered at 700℃ and 60 MPa had the highest TC(90.7 W/(m·K)),which was significantly higher than the TCs obtained for most of the previously reported Cu/Invar co.posites.

摘要：Carrying out green energy transformation,implementing clean energy power replacement and supply,and developing a new power system are some primary driving forces needed to fulfill china’s carbon-peak and carbon-neutral strategic *** co.struction of new power systems in china’s provinces and cities is developing rapidly,and the lack of a typical model promotes the *** new power system path design should be based on the actual development of the power grid in different regions,energy use characteristics,and other actual needs to carry out the differentiated path *** this co.text,this study analyzes the characteristics of the new domestic power system based on the policy background of the new domestic power system,co.structs a new model for power system development stage identification,and proposes the overall design of the new power system development path from the power supply,transmission and distribution,and load *** also uses the Hebei South Network as an example to explore the development stage of the Hebei South Grid based on actual development ***,this study designs a novel power system development path for the entire supply and demand chain for the Hebei South Grid to propose ideas for co.structing a new power system in china and to help green energy transformation.

摘要：A kind of integrated network architecture visible light co.munication (VLC) and power line co.munication (PLC) is put forward. This architecture is low co.t and easy to implement which overco.es the shortco.ing of the traditional network architecture. Furthermore, the VLC-PLC integration technology is applied to typical power grid business scene, which is substation intelligent inspection. The business process of master station platform is analyzed. During the intelligent inspection, the VLC-PLC system provides voice co.munication for on-site inspection personnel and management personnel, and position service. The system can ensure the safety and security of power production.

摘要：Ni/TiO_(2) catalyst is widely employed for photo-driven DRM reaction while the influence of crystal structure of TiO_(2) remains *** this work,the rutile/anatase ratio in supports was successfully co.trolled by varying the calcination temperature of anatase-TiO_(2).Structural characterizations revealed that a distinct TiO_(x) co.ting on the Ni nanoparticles(NPs)was evident for Ni/TiO_(2)-700 catalyst due to strong metal-support *** is observed that the TiOx overlayer gradually disappeared as the ratio of rutile/anatase increased,thereby enhancing the exposure of Ni active *** exposed Ni sites enhanced visible light absorption and boosted the dissociation capability of CH4,which led to the much elevated catalytic activity for Ni/TiO_(2)-950 in which rutile ***,the catalytic activity of solar-driven DRM reaction was significantly influenced by the rutile/anatase ***/TiO_(2)-950,characterized by a predominant rutile phase,exhibited the highest DRM reactivity,with remarkable H_(2) and co.production rates reaching as high as 87.4 and 220.2 mmol/(g·h),*** rates were approximately 257 and 130 times higher,respectively,co.pared to those obtained on Ni/TiO_(2)-700 with *** study suggests that the optimization of crystal structure of TiO_(2) support can effectively enhance the performance of photothermal DRM reaction.