Three-Phase Capacitor-Clamped Active Power Filter for Harmonic and Reactive Power Compensation

This paper presents an active power filter based on a capacitor-clamped topology to compensate harmonics and reactive power generated from the nonlinear loads. The balanced and sinusoidal line currents are drawn from the AC source under the balanced and unbalanced loads. The capacitor-clamped topology is used in the voltage source inverter to reduce the voltage stress of power semiconductors. A DC-link voltage controller, a hysteresis comparator and a neutral point voltage compensator are used in the control scheme to maintain a constant DC bus voltage of the inverter, track the compensated current and balance the neutral point voltage on DC side, respectively. The experimental results are provided to verify the effectiveness and validity of the proposed control scheme.