基于直流激磁的半铁心可调电抗器  

Semi-core Variable Inductor Based on DC Excitation Field

作　　者：蒋正荣[1] 邹军[1] 陈建业[1] 

机构地区：[1]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2007年第5期76-79,89,共5页Automation of Electric Power Systems

摘　　要：提出基于交直流正交磁化的半铁心可调电抗器的设计思想,以解决传统可调电抗器中存在的谐波较大、控制电流较高等问题。通过交流磁场和直流激磁的共同作用,可改变电抗器的有效电感量。实验结果显示,直流激磁增加时,电抗器的有效电感量会下降。与交流场正交的直流激磁可保持电抗器的线性特性,并使电抗器的电感量在一定工作电流范围内趋向稳定。运用铁磁学理论分析了正交磁化的内部机理,比较了2种绕制方式的可调电抗器的谐波特性。正交磁化的可调电抗器具有产生的谐波小、需要的激磁电流低等良好特性。This paper presents a design of variable inductor based on the orthogonal magnetization in order to reduce the amplitude of harmonic and exciting current created by traditional magnetization saturation inductor. Under the application of ac excitation field and dc bias field, the effective inductance can be changed. Experiment shows that the inductance decreases when the dc current increases. With an appropriate current in the orthogonal bias coils, an inductance plateau can be reached on which the inductance remains stable over a range of ac excitation currents, and the linearity of the magnetizing process can be maintained. In the paper, the orthogonal magnetization mechanism is analyzed. Furthermore, the harmonic characteristics are compared for two types of dc bias coils. The proposed inductor provides a good harmonic characteristic and needs less dc bias current.

关 键 词：正交磁化 可调电抗器 控制特性 磁畴 谐波 

分 类 号：TM47[电气工程—电器]