Power Quality Improvement Using an Active Power Sharing Scheme in More Electric Aircraft

This article proposed a harmonic suppression scheme that used a dc-dc converter as an active harmonic injector to cancel voltage harmonics on the HVdc bus within a hybrid power generation centre (HPGC). A permanent magnet synchronous generator and a battery are considered to supply power to a common HVdc bus through their dedicated ac-dc and dc-dc converters respectively within the HPGC. We proposed simplified mathematical models of harmonics from the ac-dc and dc-dc converters. Thereafter, an active power sharing scheme between the PMSG and the battery is developed to control the magnitudes of targeted harmonics to be the same. The targeted harmonics on the HVdc bus can thus be cancelled by properly tuning the carrier signal phase angles within ac-dc and dc-dc converters. A closed-loop control scheme has been developed and this scheme is with no extra hardware cost. To demonstrate the effectiveness of the proposed scheme, we selected the first-band harmonic (f(c) - 3f(0)) as the targeted harmonic component. The harmonic cancellation scheme for this component has been developed and validated using experimental results. It has been demonstrated that the proposed method can achieve over 90% reduction of this specific harmonic component on the HVdc bus within this HPGC using one dc-dc converter.

Automated summary

This article proposes a harmonic suppression scheme using a dc-dc converter as an active harmonic injector in a hybrid power generation center to cancel voltage harmonics on the HVdc bus. By developing simplified mathematical models and an active power sharing scheme, the magnitudes of targeted harmonics in the converters can be controlled to achieve harmonic cancellation. A closed-loop control scheme has been developed without additional hardware costs, demonstrating over 90% reduction of a specific harmonic component on the HVdc bus within the power generation center.