Abstract
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 ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f<sub>c</sub></i> − 3 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">f<sub>0</sub></i> ) 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.
Highlights
TO achieve more efficient and environmentally friendly solutions of travel, more electric aircraft (MEA) concept is one of the major trends towards future aerospace development [1][2]
We focus on using the DC-DC converter as an active harmonic damping device to suppress the first carrier sideband harmonic
This paper focuses on suppressing the first-order harmonic on DC-link capacitors
Summary
TO achieve more efficient and environmentally friendly solutions of travel, more electric aircraft (MEA) concept is one of the major trends towards future aerospace development [1][2]. The DC bus is supplied by an electrical generator and a high-voltage battery through their dedicated converters. An energy storage system (ESS) with a battery is integrated for the flexible operation of power flow Adding an extra circuit is the most straightforward solution for reducing capacitor harmonics generated from switching frequencies [12]-[15] This kind of methods can be implemented on all systems with power electronic devices. We will focus on the development of the mathematical models of (fc±3f0) harmonics
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