Abstract-This research is intended to develop a speed sensorless induction machine model of wind turbine applications using vector orientation control method. This research is expected to use the results of previous research in induction motor applications, such as the development of adaptive vector control of sensorless induction motor for estimating the actual speed. The system in this paper consists of a wind turbine mechanical model, an induction machine model, and a vector orientation controller. The system is developed in S-Function C-MEX programs, and simulated using the MATLAB/Simulink. The system is tested in the condition that the wind speed and the reference rotor speed varies as step function. The results of the simulation show that the vector orientation controller is able to maintain the actual speed according to its reference, and the observer is able to estimate the actual rotor speed.
Intisari-
An autonomous micro hydro power plant was proposed to utilize the small hydro power potency as a run-of-river. It consisted of a PMSG, a DFIG, and a converter and should be operated in the off-grid configuration. In a previous research, the DFIG stator voltages couldn't be controlled. In this paper, the novel control algorithm that is able to maintain the DFIG stator voltages of the autonomous micro hydro power plant in the off-grid configuration is proposed. The control algorithm was proposed to use the actual DFIG stator voltages and currents as feedback signals. The controller was tested by varying three input signals, i.e. the DC-link voltage, the DFIG stator voltage reference, and the external stator load which simulated the offgrid configuration. The result of the simulation showed that the DFIG stator voltages could be controlled and were always in accordance with the reference.
Keyword:Autonomous power plant DFIG Micro hydro power plant Off-grid configuration PMSG Variable angular speed
This paper was intended to examine thoroughly a critical condition of the sensorless induction generator using flux weakening in wind turbine application. The critical condition would happen when the rotor speed reached the critical rotor speed reference. The critical rotor speed reference was the highest of the rotor speed reference that still caused the stable response. It was obtained by increasing the rotor speed reference until the system response became unstable. In the low speed range of wind showed that there was no unstable condition whatever a rotor speed reference was set. On the other hand, there was a critical rotor speed reference in the medium and high speed range of wind. The unstable condition was caused by the induction generator that received a power higher than its capacity, so its rotor speed couldn't be maintained at reference value. The first solution was suggested that the stable condition would be made by setting the rotor speed reference at the minimum critical reference. The second solution was suggested that the controlling rotor speed in triangle area between the critical condition and the operation that used the minimum critical reference for the rotor speed reference. In the triangle area, the rotor speed was controlled by setting the tip speed ratio.
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