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Previous work conducted in the unified harmonic domain has been primarily focused on HVDC systems. The paper outlines the extension of this technique to a hard switched FACTS device. A unified harmonic domain model is developed for a STATCOM and solved using a Newton solution based on DC side current mismatches alone. This generic formulation maintains modularity, allowing the interaction between multiple STATCOMs to be studied. The model has been verified against a time domain solution using PSCAD/EMTDC. The proposed technique provides practically identical results, without the time domain's inherent problems with respect to steady-state simulation.