Optimal design method for LLCL filters based on NSGA‑III

The LLCL filter is usually used as a switching ripple suppressor since it can attenuate switching-frequency current harmonics much better than an LCL filter using lower total inductance and capacitance. However, it is more difficult to design LLCL parameters. In addition, it has a number of initial design constraints: the fundamental reactive power, the resonant frequency fres, etc. are coupled and always contradictory, which means that designing the parameters is a Many-objective optimization problem (MaOP). The non-dominated sorting genetic algorithm-III (NSGA-III) does well in solving this kind of problem. In recent studies, the proposed methods only provide a range of parameters. Thus, obtaining certain parameters relies on experience, and using the boundary value cannot be proved optimal. However, using original NSGA-III is somewhat timeconsuming for achieving specific parameters. To deal with this problem, this paper proposes a novel optimal design method for an LLCL filter based on NSGA-III with the handling of constraints. The proposed method gives a set of specific parameters and achieves a high computing efficiency. The proposed method is verified through simulations and a grid-connected inverter system based on a virtual instrument to show the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

B. Li, S. Huang, J. Ye, Y. Li, A. Shen, J. Deng, "Optimal design method for LLCL filters based on NSGA‑III," Journal of Power Electronics, vol. 20, no. 5, pp. 1250-1260, 2020. DOI: 10.1007/s43236-020-00100-z.

[ACM Style]

Baojin Li, Songtao Huang, Jie Ye, Yesong Li, Anwen Shen, and Junli Deng. 2020. Optimal design method for LLCL filters based on NSGA‑III. Journal of Power Electronics, 20, 5, (2020), 1250-1260. DOI: 10.1007/s43236-020-00100-z.