基于裂芯式可控电抗器双调谐滤波器研究

Study on the Double Tuned Filter Based on Splitted-core Type Controllable Reactor

传统的无源滤波器通常由固定电抗器和电容器组成,在使用中系统频率、结构以及器件参数变化均会引起失谐现象。提出利用可控电抗器代替传统的固定电抗器,使滤波器在闭环控制下能自动跟踪电源频率和其他参数的变化,始终保持在特定频率谐振。深入分析了双调谐滤波器中串联可调电抗器参数对滤波器谐振频率和其他元件参数的相对灵敏度,证明了利用单个可控电抗器实现具有自调谐功能的双调谐滤波器的可行性。以电力系统中常见的5次、7次谐波滤波器为例,设计并实现了基于单个裂芯式可控电抗器的双调谐滤波器,并在试验中取得了良好效果。它相对于有源滤波器而言结构简单,成本低,易于实现。

A conventional passive filter consists of fixed capacitors and reactors, whose filtering performance cannot remain to be satisfactory when system frequency or components parameter changes. A controllable reactor, in place of the fixed one, is proposed to automatically trace the change of frequency and parameters. The relative sensitivity of the parameter of series controllable reactor to the resonance frequency and component parameters is analyzed. It shows the feasibility to realize double tuned filter wit...