中文摘要：

多馈入直流输电系统中各换流站交流侧谐波存在交互影响现象。分别给出了多馈入直流输电系统中交流侧谐波吸收、谐波放大的定义,描述了其发生现象,提出了基于谐波阻抗分析方法的双馈入直流输电系统谐波交互影响分析模型,揭示了谐波交互影响的机理。以华东电网为例,利用EMTDC电磁暂态仿真软件,建立多馈入直流输电系统模型。通过各条直流输电工程交流滤波器组合投切、交流侧故障的仿真以及实际录波数据分析,验证了谐波交互影响现象和其发生机理,并分析比较了非特征谐波、特征谐波放大倍数的差异。对各换流站交流侧谐波自阻抗进行了扫描分析,结果表明两换流站交流侧等效谐波自阻抗幅值差值较大或相位差值较大是发生明显谐波吸收、放大现象的必要条件。

英文摘要：

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 two-infeed 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.