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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Date
2018-09-13
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Mcode
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Language
en
Pages
6
36-41
36-41
Series
IEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018, 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.Description
Keywords
grid converter, LCL filter, reduced-order observer, state-feedback current control, weak grid, observers, control system, Inductance, Integrated circuit modeling, delays, current measurement, current control
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Citation
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