PWM Rectifier Imitating Linearization Control for Diode Rectifier Through a Boost-PFC Circuit With Improved Controllability and Suppressed Harmonics

The well-functioning of power factor correction (PFC) circuit plays a crucial role for the diode rectifier application. Traditional control strategies for boost-PFC, predominantly designed under the system's quasi-steady state mode, inherently possess nonlinear traits, which may lead to pronounced harmonics in grid-side current and electromagnetic interference. Such repercussions gravely compromise the total harmonic distortion and the overall power factor (PF). Addressing this challenge, this paper introduces a novel boost-PFC control methodology, rooted in the virtual DQ coordinate transformation. By formulating an equivalent grid-tied inverter control framework for the PFC circuit under virtual DQ coordinate system, it equates the dc inductor current to the ac grid side counterpart, facilitating a linearized control for the nonlinear PFC system. Empirical findings underscore the efficacy of the proposed method, highlighting its capability to improve the output voltage and PF performance of boost-PFC. Meanwhile the proposed control also provides improvements in mitigating grid-side current harmonics under gird distortions. The theoretical analysis and effectiveness of proposed control method have been validated by both MATLAB/Simulink simulations and experiment hardware test.