Optimization Methods to Reduce Capacitor Stress in Modular Multilevel Converters

Petranovic, Nikola; Cantoni, A.; Townsend, Christopher D.; Konstantinou, Georgios

doi:10.1109/access.2020.3043254

Cited by 1 publication

(1 citation statement)

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“…During the design of a MMCC cell, the power capacitors are selected as compromise among high power density, low cost and high reliability [111], [137]. Large capacitance values lead to small voltage and current ripples and therefore small circulating currents and reduced power losses in the MMCC [137], [138], but power density is decreased and cost is increased [139]. The total energy store in MMCC capacitors as function of the nominal power is also an important design factor, namely virtual inertia, as it enables voltage ride through operation [140].…”

Section: ) Fault Modes and Failure Mechanisms In Cell Capacitorsmentioning

confidence: 99%

Faults in Modular Multilevel Cascade Converters—Part I: Reliability, Failure Mechanisms, and Fault Impact Analysis

Rojas

Jerez

Hackl

et al. 2022

IEEE Open J. Ind. Electron. Soc.

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Modular Multilevel Cascade Converters (MMCCs) are considered a promising power electronics topology in industry. Their scalability allows to reach (ultra/very) high voltage levels with low harmonic content and high efficiency and makes MMCCs an ideal solution for high-power applications; such as electrical drives, solid-state transformers and high-voltage direct-current (HVDC) transmission systems. However, the high levels of thermal, electrical and mechanical stress on the power electronics devices and the large number of components (e.g. capacitors or semiconductors) make MMCCs prone to faults reducing its reliability. In this first part of the paper, a comprehensive overview of reliability on MMCCs, failure mechanisms and fault impact analysis in MMCCs, including failure rates and fault modes is presented. Also a set of tables which collect all information to easily detect and identify faults in MMCCs is presented.

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