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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 2009

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A new scheme for power factor correction and active filtering for six-pulse converters loads

Han Y., Khan M.M., Xu L., Yao G., Zhou L., Chen C.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2009

Vol. 57, nr 2

157-169

This paper presents a novel harmonic-free power factor correction (PFC) topology based on T-type active power filter (APF), which is dedicated for power factor improvement and harmonic filtering for six-pulse converter loads. The cascaded controller structure is adopted for the proposed system, namely, the inner current loop and outer voltage loop. The current-loop control scheme is based on a decoupled state-space equations of the T-type APF using separate proportional-integral (PI) controllers in d-axis and q-axis of the synchronous rotating refer-ence frame (SRRF) synchronized with grid voltages, respectively. The fundamental components of load-side cur-rents are feed forwarded in the current-loop using two groups of synchronous frame adaptive linear neural networks (ADALINEs) to ensure estimation accuracy and a fast dynamic response. A separate proportional-integral (PI) controller is adopted in the outer voltage loop for balancing the active power flow of the voltage source inverter (VS I) dc-side capacitor. The experimental results confirm well with the theoretical analysis.