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| Harmonic Identify and Optimize Control for DC Split Capacitor Based Power Decoupling with Realistic Mismatched Capacitances |
| Sun Jiacheng1, Zhang Xiaobin1, Yao Wenli1, Zhang Xinyue1, Poh Chiang Loh2 |
1. School of Automation Northwestern Polytechnical University Xi’an 710072 China;
2. The Chinese University of Hong Kong Hong Kong 999077 China; |
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Abstract Traditionally, bulky electrolytic capacitors are commonly installed to buffer the inherent second order ripple power in single phase converter. However, electrolytic capacitor is marked as large volume, short life, and recently has the trend that be replaced by active power decoupling technology for the purpose of increasing reliability. One possible active power decoupling circuit consists of a half-bridge and two capacitors in series for forming a DC-split capacitor, which has flexible installation, independent operation and high precision decoupling. Methods for regulating this power decoupling circuit have earlier been developed, but almost always with equal capacitances assumed, leading to overlook the effects of timing progress, humidity and thermal on capacitance in real practice. To improve the power decoupling performance, this paper identified the harmonics resulting from realistic mismatched capacitance. As a result, harmonic suppression criterion and optimize control are then proposed without known online measuring real capacitance variation. Hence, the proposed method is thus robust and can meet requirement of standard IEEE 1547-2003. Finally, experimental results provided by a 1kW prototype converter have verified the harmonic suppression criterion and control scheme developed.
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Received: 05 May 2017
Published: 05 March 2018
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2018, Vol. 33 
