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CSAA/IET International Conference on Aircraft Utility systems, AUS 2018

作者： Li, Dongmin Shang, Mengquan Zhang, Yanqiang Li, Jia Ma, Guofang Department of Mechanical and Electronic Engineering Shandong University of Science and Technology Tai'an Shandong province China State Key Laboratory of Fluid Power and Mechatromc System Zhejiang University Hangzhou Zhejiang province China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province Ministry of Science and Technology Qingdao Shandong province China

ISBN: (纸本)9781785617911

In order to improve the performance of the current goods handling equipment for the airplane, a drilling rig is designed to meet with the complicated working conditions Meanwhile the drilling rig can be applied in the operation of gas drainage for the high holes underground coal mine According to the actual working conditions on the operation of gas drainage for medium or thick coal seam, the drilling rig for drilling high holes is designed based on the structure and working princfple of the current drilling rig, and the hydraulic power unit is arranged separately, and 2 two-stage telescopic hydraulic cylinders are controlled respectively to adjust the height of drilling hole and the dip angle of drilling hole. Furthermore the characteristics of the supporting speed is simulated and analyzed with AMESim, thus the results show that the drilling rig can satisfy the requirement of drilling high holes and goods handling equipment for the airplane. © 2018 IET Conference Publications. All rights reserved.

关键词： Coal mines

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Charge Evolution and Dielectric Property of Three-phase Polypropylene Composites With Enhanced Mechanical Performance

Charge Evolution and Dielectric Property of Three-phase Poly...

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中国物理学会第二十二届全国静电学术年会

作者： Ling Zhang Zhaowei Peng Yuanxiang Zhou Zekai Lu Yonggang Guan Zixia Cheng State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department School of Electrical Engineering Zhengzhou UniversityZhengzhou 450001China

High voltage DC(HVDC)power cable technology has the advantages of large transmission capacity,low loss,negligible electromagnetic environmental effect,and trackless corridor,etc.,which make it capable to solve the significant problem of power transmission channels during the fast development of electric ***,it also contributes to eco-friendly,resource-saving,safe,and reliable goal of power transmission *** to common crosslinked polyethylene materials,isotactic polypropylene(iPP)has the advantages of non-crosslinking,high-temperature-resistant,recyclable,low production cost,and free maintenance work,and has been a hot spot in the research field of high performance HVDC cable insulating ***,iPP is a thermoplastic limited by its impact strength,especially at low temperatures,because of its high degree of crystallinity and high glass transition *** of the common methods used to increase the impact strength is the addition of low-molecular elastomer materials or nucleating agents(NAs)into the iPP matrix,which is blended with the polymer in the molten *** previous investigations with the binary blending system have demonstrated that improved impact resistance usually was accompanied by decreasing the stiffness or deteriorating its original electrical properties in some *** order to achieve an optimum balance of macroscopic properties,adding several components is often necessary in polymer *** aim of this work is to investigate the synergistic effects on mechanical and electrical properties between NAs and different elastomers in iPP *** have shown that increasing the β-crystal content can improve its electrical property and elastomer can strengthen its mechanical performance.,Thus,three-phase iPP blends(iPP-β-x,x refers to the elastomer)were prepared with the incorporation of arylamide derivative β-NAs(TMB-5,0.2 wt%)and different elastomers(15 wt%)including styrene-bethylene butylene-b-styr

关键词： isotactic polypropylene β nucleating agent elastomer impact strength space charge

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Transient Behaviors of Space Charge in Low-density Polyethylene Films at Prebreakdown Under Temperature Fields

Transient Behaviors of Space Charge in Low-density Polyethyl...

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中国物理学会第二十二届全国静电学术年会

作者： Ling Zhang Zekai Lu Yuanxiang Zhou Zhaowei Peng Zixia Cheng Yonggang Guan State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department School of Electrical Engineering Zhengzhou UniversityZhengzhou 450001China

Currently,insulation performance of high voltage DC(HVDC)power cables is still of critical significance challenge in both engineering application and fundamental *** example,HVDC cable insulation suffers breakdown under the conditions of cold start and load cycling tests,and the presence of space charge at high temperatures causes electric field distortion within the ***,the operating temperature of HVDC cables could only reach 70℃at *** work intends to carry out research on the effect of temperature on space charge characteristics of low-density polyethylene(LDPE)films at prebreakdown under a linearly ramping voltage,which is of great significance for further understanding and improving the operating temperature and breakdown strength of HVDC ***-free LDPE film with a thickness of 100 μm was purchased from GoodFellow *** improved space charge measurement system was developed with a high-speed measurement interval of 1 ms,a high voltage pulse of 120 V,and a pulse width of 5 ns.A linearly ramping voltage of 0.5 kV/s was selected and cut off after breakdown *** and steady behaviors of space charge was comprehensively sudied under a linearly ramping voltage of 500 V/s at 30℃and 70℃,*** results show that negative charge was rapidly injected and accumulated near the anode at a relatively low electric field at 70℃.As the applied electric field gradually increased,the anode appeared a significant positive charge *** phenomenon occurred when charge packets were injected to a certain distance of~30 μ*** the contrast,there was only negative charge injection and accumulation in the bulk of LDPE films at 30℃,and breakdown was not observed even when the voltage rose to-30 *** was found that the anode had a positive space charge packet injection at 30℃and slowly migrated to the cathode,and the entire transit process took tens of *** the internal electric field distribution,the ma

关键词： LDPE prebreakdown transient space charge internal field distortion carrier mobility

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Modeling and Simulation of Virtual Synchronous Generator for DFIG wind turbine generator

Modeling and Simulation of Virtual Synchronous Generator for...

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International Conference on Renewable power Generation

作者： Qiongfeng Zhu Ziyu Chen Shouhong Feng Yufeng Wang Bowen Zhang Weilin Li State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute) Beijing China Department of Electrical Engineering School of Automation Northwestern Polytechnical University Xi'an China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

With the rapid development of the wind power generation, the penetration rate of wind power is gradually increasing, which affects the stable operation of the power system. The DFIG wind turbine generator can realize decoupling control of output active and reactive power by vector transformation control. However, under this power control, wind turbines do not have the electromechanical transient characteristics like synchronous generators for supporting the stable operation of the power system. Virtual synchronous generator technology can make the wind power system reflect the operation mechanism and external characteristics of traditional synchronous generators to improve the stability of power system. This paper builds a generic simulation model of current source type DFIG wind turbine generator based on VSG technology, which can simulate a series of VSG behaviors including virtual inertia control, damping control, primary frequency control, reactive power control and fault ride through. The developed simulation model is also validated comparing to the actual wind turbine field testing data, which shows accurate and reliable simulation results. The developed simulation model can provide theoretical and model basis for studying VSG technology and grid integration characteristics.

关键词： MICROGRID VSG DOUBLY-FED WIND GENERATOR DROOP control

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Rotation Speed Recovery Strategy Based On Particle Swarm Optimization for Variable power Curve Optimization

Rotation Speed Recovery Strategy Based On Particle Swarm Opt...

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2018年先进电子材料、计算机与材料工程国际学术会议（AEMCME 2018）

作者： Rui Liu Peng Song Xiaosheng Wang Yang Cui Zhongwei Lin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co.Ltd. Grid-connected Operation Technology for Wind-Solar Storage Hybrid System State Grid Corporation Key Laboratory

With the increase of wind power capacity incorporated into the grid, the permeability of wind power increases continuously, which leads to the reduction of the equivalent inertia of the system. Rotor speed recovery will cause the secondary frequency dips when DFIG uses rotor inertial control to participate in system frequency modulation. In order to optimize the secondary frequency dips, this paper uses PSO(Particle Swarm Optimization) to optimize the Parameters of Variable power Functions on the basis of the previously proposed variable power curve strategy. This article simulates this strategy through setting up a system by Simulink. Simulate the results of optimization, compared with the traditional recovery strategy, validity of the proposed strategy is demonstrated through simulation and analysis.

关键词： Swarm power Rotation Speed Recovery Strategy Based On Particle Swarm Optimization for Variable power Curve Optimization

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Statistical characteristics of transient enclosure voltage in ultra-high-voltage gas-insulated switchgear

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Plasma Science and Technology 2017年第6期19卷 74-81页

作者： Yuanji CAI Yonggang GUAN Weidong LIU State Key Lab of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 People＇s Republic of China

Transient enclosure voltage（TEV）,which is a phenomenon induced by the inner dielectric breakdown of SF_6 during disconnector operations in a gas-insulated switchgear（GIS）,may cause issues relating to shock hazard and electromagnetic interference to secondary *** is a critical factor regarding the electromagnetic compatibility of ultra-high-voltage（UHV）*** this paper,the statistical characteristics of TEV at UHV level are collected from field experiments,and are analyzed and compared to those from a repeated strike *** TEV waveforms during disconnector operations are recorded by a self-developed measurement system ***,statistical characteristics,such as the pulse number,duration of pulses,frequency components,magnitude and single pulse duration,are *** transmission line theory is introduced to analyze the TEV and is validated by the experimental ***,the relationship between the TEV and the repeated strike process is *** proves that the pulse voltage of the TEV is proportional to the corresponding breakdown *** results contribute to the definition of the standard testing waveform of the TEV,and can aid the protection of electronic devices in substations by minimizing the threat of this phenomenon.

关键词： transient enclosure voltage （TEV） gas-insulated switchgear （GIS） ultra-high-voltage （UHV） repeated strike process disconnector

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Distributed energy management for interconnected operation of combined heat and power-based microgrids with demand response

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Journal of Modern power systems and Clean Energy 2017年第3期5卷 478-488页

作者： Nian LIU Jie WANG Lingfeng WANG State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Department of Electrical Engineering and Computer Science University of Wisconsin-MilwaukeeMilwaukeeWIUSA

From the perspective of transactive energy, the energy trading among interconnected microgrids(MGs) is promising to improve the economy and reliability of system operations. In this paper, a distributed energy management method for interconnected operations of combined heat and power(CHP)-based MGs with demand response(DR) is proposed. First, the system model of operational cost including CHP, DR, renewable distributed sources, and diesel generation is introduced, where the DR is modeled as a virtual generation unit. Second, the optimal scheduling model is decentralized as several distributed scheduling models in accordance with the number of associated MGs. Moreover, a distributed iterative algorithm based on subgradient with dynamic search direction is proposed. During the iterative process, the information exchange between neighboring MGs is limited to Lagrange multipliers and expected purchasing energy. Finally,numerical results are given for an interconnected MGs system consisting of three MGs, and the effectiveness of the proposed method is verified.

关键词： Interconnected microgrids Energy management Distributed optimization Demand response Combined heat and power(CHP)

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Thermodynamic Analysis of Compressed Air Energy Storage with Integration of Wind power

Thermodynamic Analysis of Compressed Air Energy Storage with...

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2018 International Conference on Energy, power and Materials engineering (EPME 2018)

作者： Abdulla AHMED Tong JIANG State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Department of Electrical and Electronics Engineering Faculty of Engineering ScienceUniversity of Nyala

Integration of wind farm(WF) into the power grid system(PGS) will reduce the use of fossil fuels as well as minimize the greenhouse ***,due to variableness of wind energy,the control and stability of PGS become more *** air energy storage(CAES) is one of the energy storage system(ESS) technology which can mitigate the fluctuation of renewable energy sources(RESs) due to some advantages such as quick start-up time and a large storage capacity *** paper presents a modeling and simulation of CAES integrated with wind farm(WF-CAES) to investigate the thermodynamic performance of CAES on both compression and expansion modes during adiabatic and isothermal *** results show that the wind speed and compressor efficiency plays a vital role in improving the overall system efficiency during the compression mode while the flow of air and the storage pressure in the cavern plays an essential role in improving the system performance and increase the power generation during the expansion *** proposed system is suitable for remote areas to increase the energy production,reduce the use of fossil fuels and helpful in the power system economics and design.

关键词： Compressed air energy storage Thermodynamic analysis Wind power

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Ancillary service for frequency regulation based on multi-energy virtual power plant aggregating factory load

Ancillary service for frequency regulation based on multi-en...

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The 11th IET International Conference on Advances in power system control, operation and Management (APSCOM 2018)

作者： Jiazhen Wang Xinwei Shen Yinliang Xu Qinglai Guo Hongbin Sun Yanbo Chen Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University

ISBN: (数字)9781839530043

With the increasing proportion of renewable energy generation into the power grid, more challenges are coming to the safe and stable operation of the power system. In order to keep the balance in energy market, system operator has to purchase much service in ancillary service market to guarantee the stable operation of the power transmission. Virtual power plant (VPP) has been extensively studied as a concept that aggregates multiple resource forms to serve the electricity market. Meanwhile, with the development of Energy Internet (EI) Error! Reference source not found., more attention has been focused on the optimization and operation of Integrated Energy system (IES), therefore, the introduction and exploration of Multi-energy Virtual power Plant (MVPP) provide possibilities for IES to participate in the Electricity Market and Ancillary Services Market. This paper extracts the flexible electric and heat load in the industrial production process, combining the CHP units and Electric Boiler (EB), which are main heat energy supply devices as well as Energy Storage system (ESS) as a MVPP to provide Frequency Regulation (FR) service to the Auxiliary Service Market. Model Predictive control (MPC) method is applied to control the industrial load, the operation of CHP, EB and ESS are gonging to follow the AGC signal issued by the FR market effectively while avoiding impacts on the production process of the factory. Finally, case study validates the effectiveness of the model.

关键词：

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Hierarchical system Design and control of an MMC-Based power-Electronic Transformer

Hierarchical System Design and Control of an MMC-Based Power...

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作者： Fan, Boran Li, Yongdong Wang, Kui Zheng, Zedong Xu, Lie State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China

Modular multilevel converter (MMC) is an emerging and highly attractive multilevel topology for medium- and high-voltage applications. This paper proposes an MMC-based power electronic transformer (PET) for dc distribution grid. The high-voltage side is an H-bridge MMC to generate a high-frequency adjustable-magnitude sinusoidal voltage, and the low-voltage side is paralleled multiwindings and rectifiers to allow high-load currents. As the number of MMC voltage levels increases, the complexity of the control system as well as the control algorithm increases largely. In order to simplify the control system and reduce the computation time, a hierarchical control system is designed for the MMC-based PET, and the relevant hierarchical control algorithm is also presented in this paper. The modulation method, capacitor voltage balancing method, and communication solution under the hierarchical control system are all discussed in detail. Simulation and experimental results are presented to demonstrate this system and control method. © 2005-2012 IEEE.

关键词： Hierarchical systems

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