Abstract
Based on the near-area AC/DC system of Funing converter station and the electromagnetic transient model of STATCOM, this paper first studies the generation and transmission process of low-order harmonics of Funing converter station, and then analyzes the iron of the converter station transformer The core saturation characteristics and the principle of complementary resonance for the AC and DC sides have an effect on the mechanism of harmonic generation. It is concluded that there are two main reasons for the instability/non-attenuation of low-order harmonics (such as the second harmonic) in the DC converter station, one is It is caused by the saturation of the transformer core, and the other is caused by the complementary resonance for the AC and DC sides. Then, two conditions for the instability of low-order harmonics in the converter station are obtained. Finally, PSCAD/EMTDC simulation is used to reproduce the “5.29” event of the Funing converter station to verify that there are two main reasons for the non-attenuation of the low-order harmonics in the converter station. One is because the core is saturated with the fault process of the converter transformer, and the other is because the parallel impedance of the AC system near the 2 times frequency is relatively large, that is, there is a parallel resonance point.
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