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In Part I, a method for the Harmonic Power-Flow (HPF) study of three-phasepower grids with Converter-Interfaced Distributed Energy Resources (CIDERs) isproposed. The method is based on generic and modular representations of thegrid and the CIDERs, and explicitly accounts for coupling between harmonics. InPart II, the HPF method is validated. First, the applicability of the modelingframework is demonstrated on typical grid-forming and grid-following CIDERs.Then, the HPF method is implemented in Matlab and compared against time-domainsimulations with Simulink. The accuracy of the models and the performance ofthe solution algorithm are assessed for individual resources and a modifiedversion of the CIGR\'E low-voltage benchmark microgrid (i.e., with additionalunbalanced components). The observed maximum errors are 6.3E-5 p.u. w.r.t.voltage magnitude, 1.3E-3 p.u. w.r.t. current magnitude, and 0.9 deg w.r.t.phase. Moreover, the scalability of the method is assessed w.r.t. the number ofCIDERs and the maximum harmonic order ($\leqslant$25). For the maximum problemsize, the execution time of the HPF method is 6.52 sec, which is 5 times fasterthan the time-domain simulation. The convergence of the method is robust w.r.t.the choice of the initial point, and multiplicity of solutions has not beenobserved.

Harmonic Power-Flow Study of Polyphase Grids with Converter-Interfaced Distributed Energy Resources, Part II: Model Library and Validation