2020 # Failure Prediction of Submodule Capacitors in Modular Multilevel Converter by Monitoring the Intrinsic Capacitor Voltage Fluctuations

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“…Therefore, C and ESR are dominated by low‐frequency and medium (switching) frequency components, respectively. The voltage across the SM capacitors is given by $${V}_{cxyh}={I}_{cxyh}\cdot {Z}_{cxyh}$$ where ${Z}_{cxyh}$ is an impedance of the AEC by neglecting ESL, which is given by $${Z}_{cxyh}=\text{ES}{\mathrm{R}}_{cxyh}+\mathrm{normalj}{X}_{cxyh}$$ The average voltage of the SM capacitor contains a second‐harmonic voltage component in addition to a steady‐state dc‐component [25]. Typically, the manufacturers give capacitance value of AEC at (second‐harmonic) 100 or 120 Hz.…”

confidence: 99%

“…Therefore, C and ESR are dominated by low‐frequency and medium (switching) frequency components, respectively. The voltage across the SM capacitors is given by $${V}_{cxyh}={I}_{cxyh}\cdot {Z}_{cxyh}$$ where ${Z}_{cxyh}$ is an impedance of the AEC by neglecting ESL, which is given by $${Z}_{cxyh}=\text{ES}{\mathrm{R}}_{cxyh}+\mathrm{normalj}{X}_{cxyh}$$ The average voltage of the SM capacitor contains a second‐harmonic voltage component in addition to a steady‐state dc‐component [25]. Typically, the manufacturers give capacitance value of AEC at (second‐harmonic) 100 or 120 Hz.…”

confidence: 99%

“…These approaches require complex algorithms to estimate the capacitance and are limited to a specific modulation scheme. In [25], the SM capacitance estimation is performed using band‐pass filters and root mean square (RMS) calculations to determine second‐harmonic impedance. Furthermore, the analysis is carried out at low‐frequency and high‐frequency modulation schemes.…”

confidence: 99%

“…Since component failure is inevitable in power electronic circuits operating over extended periods of time, protective measures must be taken to M. Asoodar (corresponding author), C. Danielsson, and R. Söderström are with Hitachi-ABB Power Grids, Sweden (email: asoodar@kth.se) M. Nahalparvari avoid stoppage of operation as a result of component failure. These protective measures are realized through additional protective hardware [6], or via health estimation of vulnerable components [7]. The focus of this paper is on creating a reliable protective measure for dc-link capacitors in MMCs through online estimation of their health state.…”

confidence: 99%

“…Therefore, the safe operating region of the MMC is limited during such faults [4]. Moreover, the SM capacitors will deteriorate more quickly through the aging process if they are subjected to high voltage operation [5]. Aging gradually reduces their capacitance, and with aging the capacitor voltage will get even higher under unbalanced grid fault conditions.…”

confidence: 99%