Abstract
Abstract In this paper a comparative evaluation study is carried out for a 3-level, 5-level, 7-level thyristor based multi-level current reinjection (MLCR)current source converters (CSC) in terms of line current total harmonic distortion (THD) obtained, reinjection transformer requirements, reinjection switch ratings, reinjection control circuitry complexities. MLCR concept adds self commutation capability to thyristors, produces high quality line current waveforms and provides reactive power compensation in CSCs. Multi-level conversion is applied to generate the required optimum injection current which, when reinjected to the ac side reduces the line current THD. Extensive PSCAD/EMTDC simulations are presented for the comparing the different m-level reinjection schemes.
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