Operation, control, and simulation of modular multilevel converters with embedded energy storage
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Date
2019-05-10
Authors
Herath Mudiyanselage, Nuwan Madushanka Herath
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Abstract
Modular Multilevel Converters (MMCs) with storage have become popular to interconnect energy storage into power systems. The complexity of the converter makes the EMT simulation inefficient. This thesis presents a detailed equivalent model (DEM), which can be used to efficiently and accurately simulate MMCs with storage accurately. Operation and control methods of these converters are studied. The developed DEM is validated against a detailed switching model (DSM) implementation of a single phase MMC with storage. An application case of the MMC with storage in a microgrid is also studied for simulation efficiency and the impact of storage on a network. A prototype is used to validate simulation results developed from the DEM. The thesis shows that the DEM can produce accurate simulation results for MMCs with storage. Reduction of computing time achieved by the DEM is validated. The waveforms obtained from a prototype, further validates the accuracy of the DEM.
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Keywords
Modular multilevel converters, Electro magnetic transients simulation, Energy storage, Prototype