Zhao D.,Inner Mongolia Electrical Power Research Institute |
Tian L.,Inner Mongolia Electrical Power Research Institute |
Jiang W.,North China Electrical Power University |
An L.,North China Electrical Power University |
Zhang Z.,North China Electrical Power University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2017
The bolted connection is prone to slip under external load in the lattice transmission tower, which will affect the internal forces and deformation of tower. In order to better simulate the effect of bolt connection slippage on transmission tower, the load deformation relationship should be established. In this paper, the single lap splice bolt connection under tension load is tested and the load displacement curve is obtained. Furthermore, the existing model of single lap splice bolted connection is modified, which will plays an important role in the influence of the bolt slippage of the transmission lines towers more accurately and reasonably. © 2017 SPIE.
Luo Z.-P.,Inner Mongolia University of Technology |
Liu Y.-H.,Inner Mongolia University of Technology |
Yang B.-F.,Inner Mongolia Electrical Power Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014
This paper presents a novel MLCR-CSC-STATCOM topology, particularly suitable for the high power applications. Injection control technology, multi-level technology and zero level technology are used, which enables main bridge switch working in fundamental frequency to output continuous controllable AC current and high-quality current waveforms and meantime better resolve the absorption capacitance problems of conventional CSC without installing AC capacitor. This paper derives the mathematical model of MLCR-CSC-STATCOM, adopts feedback control linearization means for the affine CSC-STATCOM equations and replaces the nonlinear control design with linear state equation design. By use of PSCAD/EMTDC tools, the established model of MLCR-CSC STATCOM is simulated and some specific conclusions are drawn.
Liang G.,Inner Mongolia Electrical Power Research Institute
China International Conference on Electricity Distribution, CICED | Year: 2014
As the further growth in electricity using of Chinese urban residents, in order to meet the requirements of the city, more and more 220kV transformer substations have been constructed in the city as distribution substations. the character of such substations are: 220kV and 110kV high-voltage electrical equipment use GIS; substation area is small; the increasing power system capacity caused short circuit current of grounding fault growing. The outstanding issues of substation grounding design is that the ground area is small (5000 ∼ 10000m2), and soil resistance rate is high (normally 500 ∼ 1200Ω · m or higher). There is no external ground conditions laid and local geological conditions are poor, and soil receptivity is high. Substation using reducing agent make the grounding grid of substation corroded very serious; soil around the net salinity and soil moisture make serious corrosion of the grounding. © 2014 IEEE.
Zheng T.-T.,Inner Mongolia Electrical Power Research Institute |
Wang H.-X.,Dalian University of Technology
China International Conference on Electricity Distribution, CICED | Year: 2016
The asymmetry of electrified railway loads accessed to the power system would bring the harmonic waves and negative-sequence currents, giving rise to the distortion of voltage waves and the problems of power quality, such as the unbalance of the three-phase voltage. Combined with the project 'Power quality assessment of Bin-zhou railway electrification reconstruction project of the traction substation', this paper introduces a power quality forecast assessment method based on Power System Analysis Software Package (PSASP). Considering the railway load features, harmonic superposition characteristics and access way of traction stations, simulations are performed to analyze various power quality indexes of the point of common coupling (PCC) under different working conditions with traction loads station accessing to the system, then the power quality background test are performed for the substations of the traction station access point, the influence of electrified railway on the whole grid will be found according to the above two aspects. Results show that commutation by turns with traction stations accessing to the system has an offset effect on negative sequence current, and verify that the difference of traction load has various effects on the system. © 2016 IEEE.
Liu Y.H.,Inner Mongolia Electrical Power Research Institute |
Liu Y.H.,University of Canterbury |
Watson N.R.,University of Canterbury |
Zhou K.L.,University of Canterbury |
Yang B.F.,Inner Mongolia Electrical Power Research Institute
IEEE Transactions on Power Delivery | Year: 2013
The high-power self-commutated voltage-source converter (VSC) and current-source converter (CSC) are the key control devices in high-voltage direct current, flexible ac transmission systems, and distribution flexible ac transmission systems. To achieve the expected control objectives, suitable control strategies must be implemented based on the available devices, system models, and control techniques. The self-commutated ac/dc converters control the electrical power by generating controllable ac fundamental and dc average outputs. These controllable outputs are controlled by the conducting state combinations of the converter switching devices, driven by their gate signals. The gate signals are specified by fundamental parameters of frequency, amplitude, and phase angle. The converter system model for describing the relation between the system-state variables and the gate signal parameters is essential for the converter system control strategies. The companion paper (Part I) derives the state variable equations for the transmission systems using voltage-source-type converters. Part II is for the transmission systems using current-source-type converters. The self-commutated converter systems provide control flexibility of active and reactive powers, but their nonlinearity makes their control difficult. The linearized state equations using feedback linearization are presented to enable the controller design by using linear control theory. © 1986-2012 IEEE.
Liang G.,Inner Mongolia Electrical Power Research Institute
2010 China International Conference on Electricity Distribution, CICED 2010 | Year: 2010
This paper discusses current grounding design issues of present electric power plants, transformer substations in high soil resistivity area, by incorporating the actual engineering data of a 220KV substation, analyzes the impact degree of grounding design parameters to earth potential, contact potential, and step potential. It also can be used as a reference point for peers to discuss in engineering design. © 2010 Chinese Soc for Elec Eng.
Zhao G.,Shandong University |
Chen H.,Shandong University |
Chen H.,Inner Mongolia Electrical Power Research Institute |
Zhang C.,Shandong University |
Guan Y.,Shandong University
International Journal of Advanced Manufacturing Technology | Year: 2013
The extrusion die plays a crucial role in aluminum alloy profile production, which influences product quality and service life of extrusion die directly. In this paper, a profile with irregular shape was taken as an analysis example, and multiobjective optimization for porthole extrusion die based on modern intelligence algorithm was carried out. Aiming at achieving the uniform velocity distribution in the cross-section of the profile as well as decreasing the maximum stress on the extrusion die and the deflection of the mandrel, the angle between port bridges, the position of die orifice, and the height of welding chamber were considered as the design variables. Then Kriging model was established on the basis of Latin hypercube samplings, and above design variables were optimized using Pareto-based genetic algorithm. Finally, an optimal die structure is gained. Compared with the initial scheme, the velocity distribution in the extrudate was more even, and the stress on the die and the deflection of the mandrel were decreased obviously in the optimal scheme. The optimal design method for porthole die has strong commonality, thus, it could give useful guidelines for practical production of the same kind of aluminum profile. © 2013 Springer-Verlag London.
Han J.F.,Inner Mongolia Electrical Power Research Institute |
Tao J.,Inner Mongolia Electrical Power Research Institute |
Lu H.J.,Inner Mongolia Electrical Power Research Institute |
Xin D.H.,Inner Mongolia Electrical Power Research Institute
Applied Mechanics and Materials | Year: 2014
The recovery of braking energy is an important characteristic of electric vehicles, and the technology of regenerative braking is one of the key technologies for electric vehicles. In this paper, after analyzing the main technical problems in regenerative braking of electric vehicles, the relevant research and development at home and abroad is introduced in detail, and its prospect of development is introduced at the end of this paper. © (2014) Trans Tech Publications, Switzerland.
Yang B.,Inner Mongolia Electrical Power Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2012
To explore experimental methods and analysis means for the linear induction launcher, we designed and manufactured a linear induction launcher to carried out experimental research and simulation analysis. Moreover, we established a mesh matrix model of the linear induction launcher to analyze the dynamic performance of the secondary, voltage and current waveforms, the energy conversion ratio and the heating effect of currents. Using a two level voltage source inverter as power supply, we accelerated the launcher with a 0.275 kg aluminum alloy secondary to 18.75 m/s within the 0.96 m linear distance. The measured muzzle velocity accorded with the calculated muzzle velocity, and the measured voltage and current waveforms approximated the simulated ones. The experimental results show that the mesh matrix method can be used as an effective means to analyze the linear induction launcher. Experiment and simulation provide a reference for the further investigations of the inductive coil gun.
Zhao L.,Inner Mongolia Electrical Power Research Institute |
Cheng P.F.,Polytechnic University of Mozambique
Advanced Materials Research | Year: 2014
In this paper, the dielectric properties of ZnO- Bi2O3 based varistor ceramics doped with Li are investigated by Novocontrol wide band dielectric spectrometer. It is found that Lithium is an amphoteric impurity. If the content of Lithium is very low, It will enters into the interstitials and Lithium interstitial is formed as a donor. While with the increase of Lithium content, Zn is replaced with Li and Lithium substitution for Zinc as a acceptor is formed. If the content of Lithium increases further, Lithium interstitial is formed again with the redundant Lithium. Therefore, the concentrations of intrinsic point defects of Zinc interstitial and oxygen vacancy varies with the content of Lithium, which leads to the increase of Schottky barrier at grainboundary with Lithium. © (2014) Trans Tech Publications, Switzerland.