交流自调谐滤波器与可控电抗器

Tuned AC Filter and Tunable Reactor

交流调谐滤波器结构简单、可靠性较高、运行费用较低、广泛应用在谐波治理电路中。本文介绍了交流调谐滤波器的工作原理和固有缺点.滤波器参数变化所引起的失谐是导致滤波性能恶化的主要原因。磁阀式可控电抗器具备近似线性的伏-安特性、较小的有功损耗以及较快的响应速度等特点,而且制造工艺简单、成本低廉、高次谐波小。利用磁阀式可控电抗器电感可以连续调节的特点,可以保持滤波器在谐振点附近工作,大大提高了滤波的效果。文中介绍了新型自动连续调谐滤波器的原理结构及其关键部件,它具有自适应能力,可跟踪谐波变化,使滤波器始终工作在谐振点附近,而且能够抑制谐波放大,从经济角度考虑也比较实用,指出用有源技术增强LC调谐滤波器对参数变化的自适应能力是滤波装置今后的一个发展方向。

Tuned AC Filter has their advantages such as simple structure, high operation reliability, low operation cost and so on, and are used widely in harmonic filtering circuit. The principle and the inherent demerits of tuned AC filter are discussed, the detuning due to variation of filter parameters is the main cause of deterioration of filtering performance. Magnetic valve controllable reactor has the near-linear voltage-current characteristic, little loss and high response speed etc. while it is cheap, manufactured easily and has low harmonics, the tunable filter can be kept working On the resonance frequency for the continuous adjusting characteristic of magnetic valve controllable reactor. The newly developed auto-tuned filters are introduced in this paper. It has self-adaptive ability, tracks the change of harmonic, so the filter works around the resonant point, and more it can restrain the magnify of harmonic, it is practical in view of economy. It is the tendency to have the tuned AC filter gain the adaptability to network frequency excursions and filter component variations using active techniques.