Analysis of influence factors and rules of transformer neutral point DC

作者：Wang, Xiao Mao; Xie, Ying Geng; Zhou, Yun; Xia, Cheng Jun

来源：2nd International Conference on Advances in Energy and Environmental Science, ICAEES 2014, Guangzhou, 2014-06-21 To 2014-06-22.

DOI：10.4028/www.scientific.net/AMR.1008-1009.485

• Analysis of influence factors
• DC blocking device
• DC grounding electrodes
• Dc magnetic bias
• DC transmission systems
• Mathematical expressions
• Monopole ground operation mode
• Transformer neutral point

When DC transmission system adopts monopole earth or bipolar imbalance operation mode, the DC grounding electrode will inject large amount of current into the earth, and then disturb the running of the power grid. In view of the influence which is created by DC transmission system in Guangdong power grid, this paper derived the mathematical expressions of the transformer neutral point current after creating a calculation model, and concluded the main influence factors;The subject applied the linear regressing analysis theory to calculate the regression equations of transformers so that the slope of the regressing equation can be used to estimate the influence scope of grounding DC. Finally it concludes that: transformer neutral point current and the power transmitted by DC system has positive correlation;For ±800kV DC Chu Sui, the transformers,which is more than 80 km away from DC grounding electrode, will no longer be affected;The application of DC suppression devices will affect the neutral point current of the transformers nearby.

• 出版日期2014
• 单位华南理工大学