Abstract:
This thesis presents the simulation of the operation of DC drive based real time wind turbine for separate excite DC motor controlling rely to the condition by speed reference signal controlling. The parameters of the wind turbine were defined in MATLAB/simulink via DSP board interface card to convert the signal to the real time format for the both of armature and shunt field voltage controlling.
The design uses the parameter definition in the block function of wind turbine of MATLAB/simulink connect via the DSPACE 1104 DSP board model to the controller circuit with PIC18F4431 micro controller in PI control mode to operate the separate excite DC motor 220 volts/1,000 watts. The chopper circuit was implemented as the power circuit to control the both of armature and shunt field voltage with switching frequency at 30 kHz in order to adjust the motor speed by duty cycle control. The transfer function of motor was defined by the system identification. After that, the motor are connected to a DC generator in order to test the system when such system is in loaded condition.
The results of the wind turbine simulator relies on 3 level of wind speed, which are 1) at 2.5 m/s and 3 m/s of wind speed, DC drive utilized by armature voltage control, then 2) at 5.5 m/s of wind speed, it also utilized by armature voltage control, and 3) at 9 m/s of wind speed, it utilized by field voltage control. Therefore, the average variance of such system is about 0.60484. It shows that the motor speed is adequate equal to speed reference of the wind turbine