Study of Parallel PFC Technology Based on Parallel Inverters

Abstract:

This paper proposes a parallel PFC technology which is shunted between the power supply and the load. Parallel inverters with frequency-doubling carrier phase shifted SPWM technique is used as the main circuit structure to reduce the device currents rate and switch stress and enhance the equivalent switch frequency. The phase angle of the source current reference is determined by the source voltage, while the magnitude of that is obtained from controlling the DC side capacitor voltage of the inverter. The PFC is realized by inner current loop P control and outer voltage loop PI control for its simple arithmetic, good robustness. The simulation and experimental results show that this system can achieve a high power factor of 0.99 and low total harmonic distortion with linear or nonlinear load. So the validity and efficiency of the proposed parallel PFC technology are confirmed by the numerical results.

• Periodical: Advanced Materials Research (Volumes 546-547)
• Pages: 320-325
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.546-547.320
• Online since: July 2012
• Authors: Min Zhang, Xu Dong Song, Zheng Hua Zhu, Zhen Xing Yin
• Keywords: Double Closed-Loop Control, Frequency-Doubling Carrier Phase Shifted SPWM, Parallel Inverters, Power Factor Correction (PFC)

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