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This Letter generalises frequency-domain oriented design guidelines for optimised single-resonant three-parameter AC current regulators for grid-connected converters. Unlike in previously established set of design guidelines, possible practical restrictions imposed by relatively low-switching frequency are taken into account in the proposed methodology. In addition, resonant term bandwidth is selected according to the desired robustness to fundamental frequency variations. As a result, a closed set of three non-linear equations is created. The solution maximises the loop gain crossover frequency for a given phase margin while respecting frequency robustness and resonant gain restrictions, set a priori.

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