Harmonic interaction phenomenon exists at the AC side of every converter station in multi-infeed HVDC system.The definitions of harmonic absorption and amplification at the AC side of multi-infeed HVDC system are presented and their phenomena described.A harmonic interaction analysis model of twoinfeed HVDC system is put forward based on the harmonic impedance analysis for revealing the mechanism of harmonic interaction.As an example,an EMTDC simulation model of multi-infeed HVDC system is established for the East China Power Grid.The phenomena of harmonic interaction and its mechanism are verified by the simulation of AC-filter on-off switching and AC-side faults and by the analysis of recorded data.The difference of magnification between non-characteristic harmonic and characteristic harmonic is analytically compared.The scanning analysis of harmonic self-impedance at the AC side of every converter station shows that,greater difference of equivalent AC-side harmonic self-impedance amplitude or phase between two converter stations is the necessary condition of evident harmonic absorption and amplification.
multi-infeed HVDCHVDC power transmissionharmonic analysisharmonic impedanceharmonic transferharmonic absorptionharmonic amplificationharmonic interaction
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