标题：Harmonics and Reactive Power of Power Transformers with DC Bias
作者：Yao, Jinxia; Liu, Min; Li, Changyun; Li, Qingmin
作者机构：[Yao, Jinxia; Liu, Min] Shandong Elect Power Res Inst, Jinan 250002, Peoples R China.; [Li, Changyun; Li, Qingmin] Shandong Univ, Sch Elect Engn, Ji 更多
会议名称：Asia-Pacific Power and Energy Engineering Conference (APPEEC)
会议日期：MAR 28-31, 2010
来源：2010 ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC)
关键词：reactive power; power transformer; dc bias
摘要：The online transformers are sometimes affected by dc bias caused by geomagnetically induced currents (GIC) or HVDC/UHVDC transmission system in monopolar grounding-return mode. With dc bias, the transformer is prone to saturate and rich harmonics are introduced, on the other hand, the reactive power consumption is more different from that without dc bias. Based on the piecewise model of iron core, the harmonics are deduced. It can be found that both odd and even harmonics are functions of the biased current. After mathematical models which both electrical and magnetic circuits are involved are built, theory analysis are given in this paper. The reactive power increases drastically as the dc current enlarges. Simulations are done to confirm the validity. It provides a guide for the filter mounting and voltage control strategy drawing.