parallel transmission
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Author(s):  
A. Saber ◽  
H.H. Zeineldin ◽  
Tarek H.M. EL-Fouly ◽  
Ahmed Al-Durra

Author(s):  
Alix Plumley ◽  
Luke Watkins ◽  
Matthias Treder ◽  
Patrick Liebig ◽  
Kevin Murphy ◽  
...  

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongbo Liu ◽  
Shuyu Zhang ◽  
Li Sun ◽  
Chong Zhang ◽  
Xiaoyu Peng

In order to deeply explore the transient stability mechanism of the AC/DC hybrid system, this paper analyzes the rotor angle stability of the two-area AC/DC hybrid system. The system is analyzed after subjecting it to large disturbances in the AC system and for different operating conditions, qualitatively and quantitatively. The influence of factors, such as the AC operating point of the system and the proportion of DC transmission power, have been considered for improving the rotor motion equation. Subsequently, the transient characteristics of the hybrid system are analyzed after being subjected to disturbances. The power angle stability margin index is obtained, based on which the transient characteristics after DC blocking are analyzed, and the coordinated control strategy with the least control cost is proposed. The results are verified using the two-area AC/DC parallel transmission system network model. The study provides the reference for ensuring the security and stability of the hybrid AC/DC power grid.


Author(s):  
Shuai Mo ◽  
Yuling Song ◽  
Zhiyou Feng ◽  
Wenhao Song ◽  
Maoxiang Hou

The face gear power-split system has huge superiorities over the traditional transmission form in the application of modern rotorcraft, and it has become the research trend of the industry in recent years. Thus this paper took the double input face gear split-parallel transmission system used in the rotorcraft as the research target, and established its dynamics model through the lumped parameter theory. Based on the Newtonian second law, the dynamics equations were built and solved to gain the meshing forces and load sharing coefficients of the transmission system. Simultaneously, the impacts of the eccentric errors, support stiffness, and torsional stiffness on the load sharing characteristics were studied. The results show that the meshing forces and load sharing coefficients of each gear pair have periodic changes; the eccentric errors of each drive stage gear have only a significant effect on the corresponding drive stage. Moreover, the changes in the support stiffness of the split-torque shafts and double gear shafts mainly affect the load distribution of the parallel stage, and the shaft torsional stiffness is less sensitively to maintain load balance. In addition, the increment of the shaft stiffness increases the load sharing coefficients of the corresponding gear pairs.


2021 ◽  
Author(s):  
Koki Taruishi ◽  
Yusuke Kozawa ◽  
Hiromasa Habuchi

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