Real-time identification method for LCL filters used with grid converters
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A4 Artikkeli konferenssijulkaisussa
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Date
2019-09-29
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
3729-3736
3729-3736
Series
Proceedings of the 11th IEEE Energy Conversion Congress and Exposition, ECCE 2019, IEEE Energy Conversion Congress and Exposition
Abstract
This paper presents a real-time algorithm for identifying the inductance and capacitance values of LCL filters used with grid converters. As a side product, the grid inductance seen from the point of common coupling is also estimated. A wideband excitation signal is added to the converter voltage reference. During the excitation, the converter currents and the converter voltage reference are sampled. The samples are preprocessed in real time by removing DC biases and significant grid-frequency harmonics. Parameters of a discrete-time model are estimated at each sampling instant with a recursive estimation algorithm. The model parameter estimates are translated into inductance and capacitance values. The method can be embedded to a control system of PWM-based converters in a plug-in manner. Only the DC-link voltage and converter currents need to be measured. Simulation and experimental results are presented for a 12.5-kVA grid converter system to evaluate the proposed method.Description
Keywords
Grid converter, LCL, Real-time identification, Recursive parameter estimation
Other note
Citation
Pirsto, V, Kukkola, J, Rahman, F M M & Hinkkanen, M 2019, Real-time identification method for LCL filters used with grid converters . in Proceedings of the 11th IEEE Energy Conversion Congress and Exposition, ECCE 2019 . IEEE Energy Conversion Congress and Exposition, IEEE, pp. 3729-3736, IEEE Energy Conversion Congress and Exposition, Baltimore, Maryland, United States, 29/09/2019 . https://doi.org/10.1109/ECCE.2019.8912289