LCL Filter design and performance analysis for grid-interconnected systems
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The use of power converters is very important in maximizing the power transfer from renewable energy sources such as wind, solar, or even a hydrogen-based fuel cell to the utility grid. An LCL filter is often used to interconnect an inverter to the utility grid in order to filter the harmonics produced by the inverter. Although there is an extensive amount of literature available describing LCL filters, there has been a gap in providing a systematic design methodology. Furthermore, there has been a lack of a state-space mathematical modeling approach that considers practical cases of delta-and wye-connected capacitors showing their effects on possible grounding alternatives. This paper describes a design methodology of an LCL filter for grid-interconnected inverters along with a comprehensive study of how to mitigate harmonics. The procedures and techniques described in this paper may be used in small-scale renewable energy conversion systems and may be also retrofitted for medium-and large-scale grid-connected systems.
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Lu, M.; Wang, X.; Blaabjerg, F.; Muyeen, S.M.; Al-Durra, A.; Leng, S. (2016)For the grid-connected voltage source inverters, the feedforward scheme of grid voltage is commonly adopted to mitigate the current distortion caused by grid background voltages harmonics. This paper investigates the ...
Reznik, A.; Simões, M.; Al-Durra, A.; Muyeen, S.M. (2012)The use of power converter is becoming very popular nowadays to maximize the power extraction from wind as well as interfacing the wind generator with the power grid. LCL filter plays an important role for interconnecting ...
Benchmarking of Stability and Robustness against Grid Impedance Variation for LCL-Filtered Grid-Interfacing InvertersLu, M.; Al-Durra, A.; Muyeen, S.M.; Leng, S.; Loh, P.; Blaabjerg, F. (2017)EU This paper comprehensively analyzes the stability of a grid-interfacing inverter with LCL filter in the discrete domain, where the LCL filter, along with the controller, are modeled in a polar coordinate. System open-loop ...