Co-design of the LCL Filter and Control for Grid-Connected Inverters

In most grid-connected inverters (GCI) with an LCL filter, since the design of both the LCL filter and the controller is doneseparately, considerable tuning efforts have to be exerted when compared to inverters using an L filter. Consequently, anintegrated co-design of the filter and the controller for an LCL-type GCI is proposed in this paper. The control strategy includesonly a PI current controller and a proportional grid voltage feed-forward controller. The capacitor is removed from the LCL filerand the design procedure starts from an L-type GCI with a PI current controller. After the PI controller has been settled, thecapacitor is added back to the filter. Hence, it introduces a resonance frequency, which is identified based on the crossoverfrequencies to accommodate the preset PI controller. Using the proposed co-design method, harmonic standards are satisfied andother practical constraints are met. Furthermore, the grid voltage feed-forward control can bring an inherent dampingcharacteristic. In such a way, the good control performance offered by the original L-type GCI and the sharp harmonicattenuation offered by the latter designed LCL filter can be well integrated. Moreover, only the grid current and grid voltage aresensed. Simulation and experimental results verify the feasibility of the proposed design methodology.

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Cite this article

[IEEE Style]

Y. Zhang, M. Xue, M. Li, Y. Kang, J. M. Guerrero, "Co-design of the LCL Filter and Control for Grid-Connected Inverters," Journal of Power Electronics, vol. 14, no. 5, pp. 1047-1056, 2014. DOI: 10.6113/JPE.2014.14.5.1047.

[ACM Style]

Yu Zhang, Mingyu Xue, Minying Li, Yong Kang, and Josep M. Guerrero. 2014. Co-design of the LCL Filter and Control for Grid-Connected Inverters. Journal of Power Electronics, 14, 5, (2014), 1047-1056. DOI: 10.6113/JPE.2014.14.5.1047.