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In existing load flow model of induction generators, the magnetizing path is moved to the stator terminal, parallel to the shunt capacitor, yielding the same stator and rotor currents. The power output is equal to the mechanical power input. The stator resistance and the machine loss are ignored. It can not provide the initial condition for the dynamic and control schemes requiring the exact stator...
An nonlinear simulation model of the Switched Reluctance machine with the operation at four-quadrant founded on MATLAB is presented. The simulation of the prototype with three given rotor speeds and four different loads are made. The simulated results on the rotor speed curves, the rotor speed ascending time and the phase current waveforms are given. It is shown that the operation of the Switched...
Low-frequency torsional resonance arising from large inertia load and elastic shaft causes vibration when industrial servo system is working, which degrades the system's performance of motion control. This paper presents an adjustable inertia ratio control strategy based on designing disturbance observer, which the inertia ratio between the load and rotor is adjusted to an optimal ratio so as to suppress...
In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is...
The unsteadiness of rotor inflow caused by the atmosphere creates continuous variations of blade loads and rotor torque. Usually these loads are amplified by rotor shaft and gearbox elasticity and inertia. The authors propose here a dynamic multi-body model where the wind turbine includes a rotor, a drive train and an electrical generator. The drive train has a three stage gearbox which contains two...
One of the most important drawbacks to the application of the axial flux permanent magnet generator is represented by the relevant mechanical stresses due to the electromagnetic attraction between the stator and the rotor parts, which may arise even in double-side configurations, due to slight air-gap asymmetries. In the paper, a time-effective procedure is presented to analyze the unbalanced condition,...
Modeling of power system plays an important part in modeling of helicopter dynamics system. The precision of turbo-shaft engine model affects directly the fidelity of power system model in process of modeling and simulation on helicopter. Modeling techniques of turbo-shaft engine are studied first, secondly, engine control system model based on main rotor load feedback is proposed and an inner-outer...
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