Abstract
The modular multilevel converter (MMC) has found a place in medium and high voltage applications because of its several advantages over the multilevel topologies. It comprises of several capacitors in each phase leg and their voltages need to be measured for its reliable operation. More the number of sub-modules (SMs); more is the number of required voltage measurement devices. The use of more number of physical voltage measurement devices makes the system costly and more complex in terms of hardware implementation. A unique capacitor voltage estimation technique is proposed in this paper, using a variable gain discrete time sliding mode observer (VGDTSMO) technique. These variable gains present in sliding mode observer make it simpler for implementation. This is a generalized method that can be scalable to any number of phases and SMs. The VGDTSMO technique is validated by a mathematical proof of error convergence and simulation results are provided to substantiate the theory. The results are compared with existing literature on discrete time sliding mode observer (DTSMO) based capacitor voltage estimation of an MMC.
Published Version
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