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A benchmark system is presented for digital time-domain simulation of a shunt connected active power filter. The active power filter consists of a 3-phase voltage source converter operating under pulse-width modulation. The converter is controlled using a digital deadbeat current regulator. Harmonic prediction is employed to allow accurate harmonic compensation despite controller latencies. A PSCAD/EMTDC simulation model is developed based on a laboratory scale active power filter. By employing an experimental system as a basis, a pragmatic control structure, which accounts for all implementation constraints, is assured. Experimental measurements clearly validate the accuracy of the simulation model.