PID and Hysteresis Current Control for Induction Generator Coupled with Direct Current Motor Fed by Solar Energy System

摘要

Simulink design for three phase Induction Generator (IG) that is mechanically coupled to separately excited DC motor that supplied from photovoltaic cell has been performed and analysed. A Proportional Integral and Derivative (PID) controller and a hysteresis current controller has been introduced as control techniques to perform a stable performance to the proposed system. The system operation based on controlling the speed of the DC motor to get a suitable value that produces the wanted frequency and voltage values to the 3-phase load from the IG. This is done by using two closed loop control one for the motor speed that fed to PID controller and the other for the motor armature current that fed to the hysteresis current controller to maintain the motor speed within the suitable limit with the aid of DC-DC chopper circuit instead of using the complex three phase inverter circuits. The output voltage and current of the IG is pure sine wave without any harmonics, it is also, a simple power circuit that uses only one switch to control the DC motor armature voltage. This system is reliable if it is used in the isolated power areas and we need only one sensor that is the speed sensor and no need for any extra power source except the solar energy. Step response of the rotor speed for the induction IG has been drawn and analysed. The efficiency of the all system has been calculated, the Total Harmonic Distortion (THD) for the IG voltage and current has been computed using MATLAB Powergui tool, finally, the results has discussed.