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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。
Traditional passive filters are usually composed of fixed reactors and capacitors. In use, changes in system frequency, structure, and device parameters can cause detuning. Proposed the use of controlled reactor instead of the traditional fixed reactor, the filter under the closed-loop control can automatically track changes in power frequency and other parameters, and always remain at a specific frequency resonance. The relative sensitivity of the series tunable reactor parameters in the double tuned filter to the resonant frequency of the filter and the parameters of other components is analyzed in depth. The feasibility of using a single controllable reactor to realize a dual tuned filter with self tuning function is demonstrated. Taking the 5th and 7th harmonic filters common in power system as an example, a double tuned filter based on a single split core controllable reactor is designed and implemented, and good results have been achieved in the experiment. Compared with the active filter, it has the advantages of simple structure, low cost and easy implementation.