Single-Phase Bridgeless Rectifier Based System With Enhanced Capability of Reactive Power Compensation

Aiming at enhancing reactive power compensation (RPC) capability of the traditional single-phase bridgeless rectifier, a 2.5kVA circuit topology composed of a single-phase bridgeless rectifier and a third-order tuned LC series branch in parallel connection is proposed. The corresponding control strategy using the third harmonic injection pulse width modulation (THIPWM) technique is also presented, which enables the proposed single-phase bridgeless rectifier to operate under varied power factor with the near-sinusoidal current at the point of common coupling (PCC). The principle of the proposed topology is discussed in detail and reactive power compensation capability of the proposed single-phase bridgeless rectifier under a certain amount of active power to be transmitted to the load is studied. Simulation and experiment results are given to validate the feasibility of the proposed circuit topology and the correctness of the theoretical analysis.