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中文摘要：
在PSCAD/EMTDC中搭建了交流变电站及德宝直流详细模型。分析了750 kV自耦变压器（交流主变）发生直流偏磁时交直流系统中各种谐波的变化情况,详细分析了各谐波幅值大小与直流偏磁程度的关系,推导了直流传输功率波动与直流系统中各次谐波的关系。介绍了仿真结果。
英文摘要：
Detailed model has been constructed in PSCAD /EMTDC for AC substation and Debao DC Plant.Then this research analyzes the changes of various harmonics in AC / DC system when DC magnetic biasing occurs in 750 kV autotransformer（AC main transformer）,specifically the correlation between the harmonic amplitude with DC biasing degree;thereby derives the relationship between the DC transmission power fluctuation and every subharmonic in DC system.The simulation results are finally introduced.
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