Electromagnetic environment simulation for railway power systems

Author(s):  
Natalya Buyakova ◽  
Vasiliy Zakaryukin ◽  
Andrey Kryukov ◽  
Andrey Stepanov
Author(s):  
John Laury ◽  
Lars Abrahamsson ◽  
Math Bollen

In today’s Swedish and Norwegian low frequency railway power system the voltage at a converter is controlled such that its voltage will drop with increased reactive power output. However, for low frequency railways the influence of active power on voltage is larger compared to public power systems and alternative methods are interesting to investigate. This paper presents a modified voltage control law for increased load sharing between converter stations and reduce the risk for converter overload in low frequency railways power systems. The modified voltage control law is derived mathematically and tested with different droops for two case studies. The results confirms the increased load sharing between the converter stations. The results are analysed and discussed; ideas are presented to counteract some of the negative impacts of the modified voltage control law.


2012 ◽  
Vol 182-183 ◽  
pp. 602-605
Author(s):  
Qian Zhang

Hardware-in-the-loop communication equipment simulation is an important step of the development about communications and electromagnetic environment simulation. Reference to the "software radio" design thinking, the source library is generated by the software and different communication signals are generated by the fixed hardware frame. The system achieves “versatility”. GMSK in wireless communications has been widely applied. It is one of the important signals generated by the simulator. Based on analysis of the structure, the paper introduces the design of the simulator. It also provides the software simulation of Matlab. It provides a reference simulation for communications equipment and electromagnetic environment simulation.


2015 ◽  
Vol 713-715 ◽  
pp. 274-277
Author(s):  
Wang Feng ◽  
Jun Feng Zhao ◽  
Shi Yang Ma

Decision capacity and command level is essential for accurate aerial delivery of parafoil. In this paper, we according to the system theory and the modular scheme, put forward the parafoil precision airdrop aided decision model consist ofaircraft flight route model,parafoil maneuvering performance model,high altitude wind field characteristic model, landing terrain environment model, the enemy threat situation model, complex electromagnetic environment simulation mode. Andwe focuses on the aircraft flight route model, landing terrain environment model and the simulation model of high altitude wind. The model can providecertain auxiliary decision information to airdrop commander; can also be used to other specific precision airdrop work.


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