Abstract
Capacitors are critical components of power converter systems as they influence the cost, size, performance, and scale of such systems. However, capacitors exhibit the highest degeneration and breakdown rates among all power converter components due to their wear-out failures and short lifespans. Therefore, condition monitoring is a vital process to estimate the health status of capacitors and to provide predictive maintenance for ensuring stability in the operation of power converter systems. The equivalent series resistance (ESR) and the capacitance of the capacitor are two widely used parameters for evaluating the health status of capacitors. Unlike the ESR, the capacitance of a capacitor is suitable for the health monitoring of various types of capacitors; therefore, it is more preferable for large-scale systems. This paper presents an overview of previous research addressing this aspect of capacitors and provides a better understanding of the capacitance monitoring of capacitors utilized in power converter systems.
Highlights
Power electronic converters are employed as interfaces between sources (such as grids, wind turbines, and solar photovoltaic (PVs)) and loads
There are three types of capacitors that are widely used in power electronic systems: aluminum electrolytic capacitors (Al-Caps), metallized polypropylene film capacitors (MPPF-Caps), and high capacitance multilayer ceramic capacitors (MLC-Caps)
The Al-Cap consists of two aluminum foils that are parallel plates; the positive foil acts as the anode, whereas the negative foil acts as the cathode
Summary
Power electronic converters are employed as interfaces between sources (such as grids, wind turbines, and solar photovoltaic (PVs)) and loads (such as transmission systems, motor drives, electric vehicles, and residential houses). The electrolyte is an electrical conductor and serves as a contact to the aluminum foil covered by the aluminum oxide dielectric layer. Each strip features a significantly thin typically composed of that is applied to one or both sides to serve as metallization the electrodes.layer, The capacitor is wound composed of aluminum, that is applied to one or both sides to serve as the electrodes. MLC-Cap typically comprises several parallel conductor plates aligned withinin the dielectric. MLC-Cap typically comprises several parallel internal conductor plates aligned within the dielectric that the distance between two neighboring remains fixed. Layers, such layers, that thesuch distance between two neighboring conductorsconductors remains fixed.
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