Abstract :
A robust sliding-mode controller, suitable for the output voltage control of voltage-sourced unity-power-factor three-phase pulsewidth modulation (PWM) rectifiers, presenting no steady-state errors, is described. This “just-in-time” switching controller controls the output voltage and the line input currents, while providing bidirectional power flow, near-unity-power-factor operation, low harmonic content, fast dynamic response of the output voltage, and minimum switching frequency due to a new α-β space-vector current regulator. The voltage controller performance is compared with the behavior of the conventional proportional integral output voltage control, aided by PWM current-mode modulators, and with the nonrobust fast and slow manifold sliding-mode approach. The comparison shows that the proposed controller confers faster dynamics and does not present steady-state errors. Test results confirm that the performance of the controller is independent of system parameters and load and exceeds the performance of existing hysteretic current-mode control systems
Keywords :
PWM power convertors; dynamic response; electric current control; power factor correction; rectifying circuits; robust control; two-term control; variable structure systems; voltage control; α-β space-vector current regulator; PI control; PWM current-mode modulators; bidirectional power flow; boost-type unity-power-factor PWM rectifiers; fast dynamic response; hysteretic current-mode control systems; line input current control; low harmonic content; minimum switching frequency; near-unity-power-factor operation; nonrobust manifold sliding-mode; output voltage control; proportional integral output voltage control; robust sliding-mode controller; sliding-mode control; voltage-sourced rectifiers; Bidirectional power flow; Control systems; Error correction; Pulse width modulation; Rectifiers; Robust control; Sliding mode control; Space vector pulse width modulation; Steady-state; Voltage control;
