Volume 20, Issue 4 (JIAEEE Vol.20 No.4 2023)
Journal of Iranian Association of Electrical and Electronics Engineers 2023, 20(4): 23-32 |
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Zoraghi Jedi M, Barakati S M, Barahouei V, Rahmani Haredasht M. Group measurement of capacitor voltage and capacitance online monitoring for modular multilevel converter. Journal of Iranian Association of Electrical and Electronics Engineers 2023; 20 (4) :23-32
URL: http://jiaeee.com/article-1-1537-en.html
URL: http://jiaeee.com/article-1-1537-en.html
University of Sistan and Baluchestan
Abstract: (1752 Views)
The modular multilevel converter (MMC) is a common choice for high power applications due to its expandable structure. However, the use of a large number of capacitors in the MMC structure has caused the primary technical challenge in reducing its reliability. In power electronics applications, capacitors are one of the components with the highest probability of failure. As well, the MMC structure requires many voltage sensors to maintain the capacitor voltage balance, which raises the converter's cost. Furthermore, the use of a large number of voltage sensors increases the amount of information exchanged between the power system and the central processor, limiting its performance. Therefore, capacitance health monitoring (CHM) of capacitors is necessary by reducing the number of voltage sensors. The paper presents a CHM method using fewer sensors. In the proposed method, one voltage sensor is used for both half-bridge sub-modules, and the voltage of the capacitors is obtained using a capacitor voltage estimation method with low computational burden. In addition, a straightforward CHM method is presented using the ratio of estimated to measured capacitor voltage rise during positive arm current. Simulation and experimental results show the efficiency of CHM methods and proposed sensor reduction in different conditions.
Keywords: Modular multilevel converter (MMC), capacitance monitoring, voltage sensor reduction, reliability
Type of Article: Research |
Subject:
Power
Received: 2022/12/5 | Accepted: 2023/04/27 | Published: 2023/08/6
Received: 2022/12/5 | Accepted: 2023/04/27 | Published: 2023/08/6
Extended Abstract [PDF 259 KB] (43 Download)
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