Sliding-mode virtual flux oriented control of PWM rectifier with DC-bus voltage and current sensors

The paper presents a line-side sensorless control of PWM rectifier with a virtual grid flux vector orientation and a sliding-mode approach. The grid currents and virtual flux are estimated using a sliding-mode current observer mixed with a nonlinear asymptotic observer and a virtual grid flux estimator. The only inputs of this nonlinear observer system are measured values of a DC-link current and voltage, as well as a PWM control pattern. The fast dynamics and robustness of the proposed sensorless control system has been presented in simulation and experimental results.