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Gao Z.-Y.,Inner Mongolia University of Technology | Gao Z.-Y.,Inner Mongolia Autonomous Regions Renewable Energy Key Laboratory | Wang J.-W.,Inner Mongolia University of Technology | Wang J.-W.,Inner Mongolia Autonomous Regions Renewable Energy Key Laboratory | And 5 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2010

In wind tunnel opening, the instantaneous flow field in 1/3 circle around the rotor were measured by PIV under different tip speed ratio. As the tip speed ratio increases, the radial displacement of tip vortex increases, the radius of tip vortex inducible region increases, the radius of overall wake increases. At the same time, the axial velocity defect increases, and the axial displacement of tip vortex decreases. There was a stronger velocity gradient region around the rotor because of the interaction between tip vortex induce and rotor rotation, the vibration inspirited by inducible flow makes the tip vortex shedding from the blade fluctuating in wake, and the stronger fluctuations far away the rotor. By the locality average, the rule was found that the intersections connection of tip vortex trajectory and azimuth planes approximately is line, and its slope increase with the tip speed ratio. Source

Guangping Z.,Harbin Engineering University | Peixiu X.,Harbin Engineering University | Xuedong Z.,Inner Mongolia Power Exploration and Design Institute
Key Engineering Materials | Year: 2010

Realistic Failure Process Analysis (RFPA3D) was used to simulate the concrete-filled rectangular steel tube columns which are subjected to axial loads. The ultimate bearing capacity and the load-strain figures were presented. The Numerical simulation results were verified by experimental data of the paper [5]. Meanwhile, the development process of crack in the specimen was described. The whole failure process of rectangular steel tube columns was reproduced. The failure principles of concrete-filled rectangular steel tube column were discussed deeply. © (2010) Trans Tech Publications, Switzerland. Source

Li M.,Inner Mongolia University of Technology | Zhao M.,Inner Mongolia University of Technology | Ma L.,Inner Mongolia University of Technology | Duan Y.,Inner Mongolia Power Exploration and Design Institute | And 3 more authors.
Dianwang Jishu/Power System Technology | Year: 2011

A gate fire unit for voltage reinjection multilevel VSC converter with cascaded H bridges, which operates under the condition of high voltage and high capacity, is designed. During the design of fire unit, a lot of key problems to be paid attention to in practice, such as switching pattern selection, how to synchronize with power grid, edge state judgment and so on, are analyzed in detail, and the simulation that takes the application of the designed gate trigger unit in STATCOM as background is performed. Simulation results show that the designed gate fire unit based on reinjection multilevel converter possesses good steady-state response and dynamic response. Source

Li J.,Technology Development Service Center | Li B.,North China Electrical Power University | Yao G.,Technology Development Service Center | Kou J.,Inner Mongolia Power Exploration and Design Institute | And 5 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

In order to improve the power supply efficiency of the thermal power plants, a system coupling of gas turbine and boiler was proposed, and a performance model of the coupled system was established. The prediction shows that the performance of the system is influenced significantly by the temperature of exhaust gas. At temperature of exhaust gas of 130°C, the thermal efficiency of the coupled system improves, and the coal consumption of the system reduces correspondingly. At certain maximum operating temperature of gas turbine, the ratio of the total air volume into the boiler and the air volume into gas turbine has an optimum value. The efficiency of the coupling system could improve more than 0.5% when the maximum operating temperature of gas turbine is 700°C, the increasing of power supply could be up to 4% at the same operating temperature of gas turbine. Taking into account of the unit thermal efficiency, cold end corrosion and the other factors, the best increasing of power supply is 1.64% by deleting the power consumption of fan. At same condition, the optimum ratio of the total air volume into boiler and the air volume into the gas turbine is about 4.29. © 2012 Chinese Society for Electrical Engineering. Source

Ren Y.,Inner Mongolia University of Technology | Cao L.,Inner Mongolia Power Exploration and Design Institute | Xu S.,Inner Mongolia University of Technology | Li J.,China Electric Power Research Institute | Li H.,Inner Mongolia University of Technology
Proceedings of 2010 International Conference on Intelligent Control and Information Processing, ICICIP 2010 | Year: 2010

Dynamic voltage restorer (DVR) is widely applied to industry because it can reduce the impact of voltage disturbance to sensitive loads. The three detecting methods to extracted distortion components of DVR based on Hilbert transform, wavelet transform, and the instantaneous reactive power theory produce are introduced in details, respectively. Comparisons of working performance among these difference detecting methods of DVR are applied to power quality disturbance analysis under various run conditions. The results show that the method of Hilbert transform doesn't detect distortion voltage of containing harmonic; the method of instantaneous reactive power theory can detect harmonic components, but doesn't detect distortion voltage of containing voltage sags; the method of wavelet transform has best detecting performance under different run conditions. Simulation results verify three detecting methods' applicability and effectiveness in DVR system. © 2010 IEEE. Source

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