Abstract：Based on the T model of transformer, the theoretical formula for calculating the effect of DC bias on commutation angle of converter transformer is derived. Using finite element simulation software of electromagnetic field and external circuit switch control, the inverter commutation model considering the actual transformer inductance change is established. The influence of geomagnetic storm on the converter transformer is simulated by applying direct current of different magnitude and direction to the neutral point of converter transformer. By analyzing the commutation angle change of six times in a period, the relationship between each other and the relations of the changes with DC direction, magnitude and the trigger leading angle are obtained. By Fourier decomposition of the DC voltage and AC current waveform, it is found that the non-characteristic harmonics appear in the AC current during the magnetic storm, the high-frequency component increases more greatly, and the DC voltage harmonic number changes from multiples of six to multiples of three. The reason of commutation angle and harmonic change is explained by combining the theoretical formula of commutation angle and excitation current waveform, and the model is verified.
黄天超, 王泽忠. 地磁暴对直流输电逆变侧换相角及谐波的影响机理分析[J]. 电工技术学报, 2020, 35(16): 3377-3384.
Huang Tianchao, Wang Zezhong. Mechanism Analysis of Geomagnetic Storm on Commutation Angle and Harmonic of Invert Side of HVDC Transmission. Transactions of China Electrotechnical Society, 2020, 35(16): 3377-3384.
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2020, Vol. 35 
