Abstract
In this paper, a novel improved shunt hybrid active power filter (SHAPF) is presented based on cascaded H-bridge converter to compensate the harmonics on the grid. This improved structure of SHAPF can significantly reduce the 5th and 7th harmonics which mainly affect the power quality on the grid. H-bridge converter and passive power filter (PPF) are connected in series to compensate the harmonics together, passive power filter is mainly used to compensate 5th and 7th harmonics, and the other harmonics are compensated by the cascaded H-bridge converter. Furthermore, based on the generalized inverse system, a decoupling control method is proposed for the nonlinear and strong coupling characteristics of the 2-input 2-output improved SHAPF. After using an interactive algorithm and analyzing based on the operating principle, it is verified that the improved SHAPF model is reversible. The improved SHAPF-generalized inverse system is obtained, which is decoupled by the generalized inverse system theory after forming a composite system in series with the original system. Finally, by using an additional PI controller, the first pseudo-linear system that controls decoupling can achieve performance tuning of the subsystem. The effectiveness of this decoupling method is proved by MATLAB simulation that the decoupling subsystem has good performance, both dynamic and static.
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Acknowledgements
The author is very grateful to the reviewer for his review of the manuscript and proposing valuable suggestions and supported by the National Natural Science Foundation of China, 51776015, Gansu Natural Science Foundation of China, 18JR3RA117 and the National Key Laboratory of Large Electric Drive Systems, SKLLDJ022016015.
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Li, X., Li, R., Li, B. (2020). An Improved Shunt Hybrid Active Power Filter Based on Cascaded H-Bridge Converter and Its Generalized Inverse System Decoupling Control. In: Jia, L., Qin, Y., Liu, B., Liu, Z., Diao, L., An, M. (eds) Proceedings of the 4th International Conference on Electrical and Information Technologies for Rail Transportation (EITRT) 2019. EITRT 2019. Lecture Notes in Electrical Engineering, vol 638. Springer, Singapore. https://doi.org/10.1007/978-981-15-2862-0_15
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DOI: https://doi.org/10.1007/978-981-15-2862-0_15
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