Multi-Dimension Harmonic Current Feedforward Compensation Control of AC-DC PFC Converter

Single-phase AC-DC power factor correction (PFC) converters have instantaneous input and output power imbalances, resulting in second harmonic components in the output voltage. Usually the external voltage loop is designed as a low-bandwidth mode, that is, a low-pass filter (LPF) is introduced to eliminate the influence of the output voltage harmonics on the reference current, which reduces the dynamic performance of the system. Different from the existing LPF harmonic influence suppression scheme, this paper proposes a multi-dimensional harmonic current feedforward compensation control scheme, which extracts the odd harmonics in the input current through a band-pass filter, and converts the odd harmonics in the input current into even harmonics by dq coordinate transformation wave. And the converted even harmonics are fed forward to cancel the even harmonics in the voltage outer loop, thereby suppressing the harmonic distortion of the reference current. Taking a single-phase Boost PFC circuit as an example, an experimental prototype was built and the feasibility verification of the proposed scheme was completed. The results show that compared with the traditional LPF scheme, the proposed scheme improves its dynamic response by about 70% while ensuring high-quality input current.