Discrete Time Adaptive Observation of Capacitor Voltage of Modular Multilevel Converters

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Abstract
The modular multilevel converter (MMC) used in medium and high voltage applications due to its several advantages related to scalability and modularity. An MMC consists of several sub-modules (SMs) which house several capacitors in each arm of each phase. For the working of MMC, the voltage across these capacitors needs to be measured. High voltage applications demand more number of SMs, which needs more capacitors and its voltage sensing devices for operation. In this paper, a discrete time adaptive observer (DTAO) is designed for the estimation of capacitor voltages of SMs by taking the discrete model of an MMC. It handles the uncertainties due to the modeling error and parasitic dynamics and makes the design robust. This design approach is very simple as it serves the engineer to choose the design parameter in an easy way. This method is also compared with discrete time sliding mode observer (DTSMO) approach.

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