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The size and number of wind turbines are due to rise dramatically. Increasing dependence on wind generation requires suitable dynamic models of doubly-fed induction generator (DFIG) that can be easily deployed in power system studies. This paper presents the multi time-scale dynamic models of DFIG implemented in the power system simulation tool DIgSILENT. The response characteristics of the detailed...
In this paper, a coordinated control problem of ship power system with SVC is addressed based on Hamilton function method. Firstly, a sufficient analysis for nonlinear modeling of Marine Diesel Engine Generator, SVC modeling, and propulsive motor load coupled nonlinear dynamic characteristics, secondly Hamilton realization of the modeling of the generator is obtained by a present state feedback technique,...
Due to its nonlinearity, when the load changes largely, 12-pulse rectifier with the PID controller can't adapt to the changes of the system parameters, which may lead to poor control performance. The fuzzy control can work under imprecise input and can handle nonlinear problems. In this paper, a fuzzy controller is designed for 12-pulse rectifier to control the output voltage of the system. And the...
Scientists have aimed at researching land use and land cover change (LUCC) and analyzing the possible trajectories of land use change in the near future in order to improve our understanding of the causes and consequences of these phenomena. This study addresses LUCC in Minjiang River, China, from 1980 to 2008. Based on satellite images, LUCC change was assessed using area of land cover change and...
Compared to the land power systems, the loads of the ship power systems have a sererious influence on the stability of the systems. Furthermore, the dynamic/static loads and generators have high nonlinear and coupling interactions. In order to attenuate the impact on the frequency of Marine Diesel Engine Generator, speed regulating control problem of marine power system under diffident working conditions...
The deformation, internal forces and stress of throttle slice of shock absorber were analyzed, the mathematical model of stress was found through the relation of stress with the deformation. Followed is a practical example of stress analytic computation, together with other approximate methods by machine design book and by ANSYS, compared the results of stress computation, and analyzed the declination...
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