Abstract
Compared with traditional high voltage direct current (HVDC) transmission, flexible HVDC transmission offers numerous advantages in technology, economy, and environmental protection. However, flexible HVDC systems involve many semiconductor devices such as the insulated gate bipolar transistors (IGBT) and power diodes, which often operate under high-frequency switching, causing severe radiated electromagnetic interference. Accurate forecast of such electromagnetic disturbance is crucial for ensuring the safe and reliable operation of the flexible HVDC transmission systems. To achieve this goal, a three-dimensional finite element model of the valve towers of the modular multilevel converters (MMC), which are the elementary components of the HVDC transmission systems, has been built. By utilizing the IGBT mathematical model and the direct frequency domain method, the time profiles as well as the frequency spectra of the transient currents of the IGBTs are extracted and imposed to the finite element model as the excitations inducing electromagnetic interference. Furthermore, the finite element model is integrated in a dedicated APP. Taking into account the widely used capacitor voltage sequencing method of sub-modules, a user-friendly and efficient interface was designed based on the Simdroid platform. This interface allows for parametric modelling, straightforward meshing, calculation, and post-processing. The App provides a comprehensive prediction of the electromagnetic disturbance level of the flexible HVDC transmission systems including the near field distribution pattern and far field propagation characteristics under various operation conditions, which is favorable to the design and optimization of the shielding and protection structure of the converter.
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Yi, L., Ma, X., Xiang, R., Lian, H., Wang, H., Wang, J. (2024). Modeling and APP Development for the Evaluation of the Electromagnetic Disturbance of Modular Multilevel Converter Towers. In: Cai, C., Qu, X., Mai, R., Zhang, P., Chai, W., Wu, S. (eds) The Proceedings of 2023 International Conference on Wireless Power Transfer (ICWPT2023). ICWPT 2023. Lecture Notes in Electrical Engineering, vol 1159. Springer, Singapore. https://doi.org/10.1007/978-981-97-0877-2_6
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DOI: https://doi.org/10.1007/978-981-97-0877-2_6
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