摘要
根据某实际直流输电工程,在PSCAD/EMTDC中搭建了750 kV变电站及该直流详细模型,采用地电位升高的方法来研究主变压器和换流变压器偏磁现象及各种谐波的特性。分析了交直流系统中各种谐波随变电站和换流站地电位升高的变化趋势;计算了交直流系统中整流侧交流母线谐波畸变率以及合并建站与否的谐波畸变率比值;详细对比分析了变电站和换流站合并建站与否各谐波幅值大小随地电位升高而增长的规律。最后,分析了由直流电流和电压畸变而引起的直流系统传输功率的波动情况。
The detailed model for 750kV power substation and its HVDC is built in PSCAD/EMTDC based on a real HVDC Transmission Project. The ground potential （GP） rising method is applied to study the bias magnetic phenom- ena and the various harmonic characteristics of the main transformer and converter transformer. The changing trend of the various harmonics in AC-DC system is analyzed when the ground potential of the power subatation and converter station is rising. The harmonic distortion rate of the rectifier side AC bus in the AC-DC system and the ratio of har- monic distortion rate are calculated, in the condition that whether power substation and the converter station are built together or not. Detailed comparative analysis is made on the increasing law of the amplitude of various harmonic changing along with the increase of the ground potential under the condition that whether the power substation and the converter station are built together or not. Finally, the fluctuations of the transmission power of the HVDC system caused by DC current and voltage distortion are analyzed.
出处
《华东电力》
北大核心
2013年第6期1206-1210,共5页
East China Electric Power
基金
国家自然科学基金重点项目(51037003)
国家863高技术基金项目(2011AA05A119)
国家电网公司科技项目(JXGS-20121123)~~
关键词
地电位
换流变压器
谐波
直流输电
传输功率
ground potential
converter transformer
harmonics
HVDC transmission
transmission power
