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Article Navigation >  IEEE/CAA Journal of Automatica Sinica  > 2025  > In Press, Accepted Manuscript
Ricardo L. A. Ribeiro, Reuben P. R. Sousa, Alexandre C. Oliveira, Antonio M. N. Lima, and Q.-L. Han, “Online estimation of DC-link capacitor parameters of three-level NPC converters using inherent signals analysis,” IEEE/CAA J. Autom. Sinica, 2025. doi: 10.1109/JAS.2025.125159
Citation: Ricardo L. A. Ribeiro, Reuben P. R. Sousa, Alexandre C. Oliveira, Antonio M. N. Lima, and Q.-L. Han, “Online estimation of DC-link capacitor parameters of three-level NPC converters using inherent signals analysis,” IEEE/CAA J. Autom. Sinica, 2025. doi: 10.1109/JAS.2025.125159
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Online Estimation of DC-link Capacitor Para-meters of Three-Level NPC Converters Using Inherent Signals Analysis

doi: 10.1109/JAS.2025.125159
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    Abstract
  • This paper presents a method for estimating the parameters of DC-link capacitors in three-level NPC voltage source inverters (3L-NPC-VSI) used in grid-tied systems. The technique uses the signals generated by the intermodulation caused by the PWM strategy and converter topology interaction to estimate the capacitor parameters of the converter DC-link. It utilizes an observer-based structure consisting of a recursive noninteger sliding discrete Fourier transform (rnSDFT) and an RLS filter improved with a forgetting factor (oSDFT-RLS) to accurately estimate the capacitance and equivalent series resistance (ESR). Importantly, this method does not require additional sensors beyond those already installed in off-the-shelf 3L-NPC-VSI systems, ensuring its noninvasiveness. Furthermore, the oSDFT-RLS estimates capacitor parameters in the time-frequency domain, enabling the tracking of capacitor degradation and predicting potential faults. Experimental results from the laboratory setup demonstrate the effectiveness of the proposed condition monitoring method.

     

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