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Observer-based current control for converters with an LCL filter: Robust design for weak grids
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A4 Artikkeli konferenssijulkaisussa
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en
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6
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IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018, pp. 36-41, IEEE international symposium on sensorless control for electrical drives
Abstract
This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.
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Rahman, F M M, Riaz, U, Kukkola, J, Routimo, M & Hinkkanen, M 2018, Observer-based current control for converters with an LCL filter : Robust design for weak grids. in IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018. IEEE international symposium on sensorless control for electrical drives, IEEE, pp. 36-41, IEEE International Symposium on Sensorless Control for Electrical Drives, Helsinki, Finland, 13/09/2018. https://doi.org/10.1109/SLED.2018.8486047