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New Structure Design for 126kV HV Vacuum Circuit Breaker
Xie Jiuming,Sun Dengyue,Wang Jianzhong,Cao Jianbo,Liu Wenping 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
This paper analyzes the advantages of double breaks under series connection for 126kV HV vacuum circuit breaker. It makes efforts in the break designing to avoid hidden danger brought by voltage-sharing capacitor. Voltage is evenly distributed in the shape of ▽ at the basic break that asks for no voltage-sharing capacitors. Permanent magnetic actuator is used to ensure the synchronization of opening and closing of double breaks. Based on this layout, this paper designs a new actuator and motion system for vacuum circuit breaker optimized by virtual prototype software ADAMS and genetic algorithm. Laboratory tests have proved that the opening and closing speed of the breaker meets the speed standard and that the 126kV HV vacuum circuit breaker is feasible.
Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect
Si, Jikai,Xie, Lujia,Han, Junbo,Feng, Haichao,Cao, Wenping,Hu, Yihua The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degree-of-freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3D finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3D finite element model and prototype test, which validates the corrected mathematical model.
Design and Control of Bi-directional DC/DC converter for 30kW fuel cell power system
Xiao Li,Wenping Zhang,Haijin Li,Ren Xie,Dehong Xu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Fuel cell (FC) power system is considered as an alternative energy power generation system in the future. This paper studies the bidirectional DC/DC converter for a 30㎾ three-phase fuel cell power system. The FC power system is sensitive to load characteristics in stand-alone mode, because rapid change or unbalance of the three-phase load will endanger the safety and expectancy of fuel cell. The bidirectional DC/DC converter with energy storage component is used to provide the dynamic power to avoid fast changing in fuel cell output. In addition, it acts as DC bus capacitors to absorb the low frequency current ripple. Therefore, fuel cell is separated from the low frequency current ripple and large DC bus electrolytic capacitors can be eliminated. Through investigating topology of the bidirectional DC/DC converter, three-level bidirectional DC/DC converter (TLBD) is used for the 30㎾ fuel cell power system. The design and control of the TL-DB is described. TL-DB with its control strategy is verified by the experimental results.
Mathematical Model of Two-Degree-of-Freedom Direct Drive Induction Motor Considering Coupling Effect
Jikai Si,Lujia Xie,Junbo Han,Haichao Feng,Wenping Cao,Yihua Hu 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degreeof- freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3D finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3D finite element model and prototype test, which validates the corrected mathematical model.