Control Circuit for Rotor-Side Converter in Doubly-Fed Induction Machine

This is the control circuit for the rotor-side converter of a doubly-fed induction machine operating under no-load conditions. A doubly-fed induction machine is an electrical drive device consisting of a rotor and a stator, where the rotor comprises a three-phase winding and the stator includes a three-phase winding with an additional winding. During normal operation, electromagnetic induction between the stator and rotor generates torque, enabling machine rotation. Under no-load conditions, where no external load is applied, the machine's operation must be regulated through the rotor-side converter's control circuit. The control circuit incorporates a PWM signal generator, a current detection circuit, and a closed-loop controller to manage rotor current and voltage. Implementation typically involves generating PWM signals using microcontroller timers or dedicated PWM modules, sampling rotor currents via Hall-effect sensors or shunt resistors with analog-to-digital conversion, and employing PI control algorithms in the closed-loop controller to maintain desired current references. Through this control circuit, the machine's rotational speed and torque can be effectively regulated, ensuring stable and efficient operation.