自适应多调谐滤波器的研究

提出了一种基于有源电抗器的新型自动调谐滤波器，利用电感的非线性频率特性，实现了单条LC串联支路抑制多次谐波的目标．有源电抗器由一对耦合绕组和一个补偿电流发生器组成，通过控制有源电抗器补偿绕组中的谐波磁通补偿电流，可以独立且连续地调节电抗器在不同谐波频率下的电感量．针对消除失谐或限制谐波电压含量的不同控制目标，提出了谐波磁通补偿电流的两种生成方法，补偿电流分别是滤波器电流或母线电压中各次谐波分量与调节系数的加权合成．实验系统在不同运行方式下的测试结果表明，这种滤波器能够同时抑制多次主要谐波分量并有效地消除失谐．

Research on the Adaptive Multi-Tuned Power Filter

To achieve the mitigation of multiple harmonics with a single LC series branch, a novel autotuning filter based on the nonlinear frequency characteristic of inductance of an active reactor is presented, where the active reactor consists of a pair of coupled windings and a generator of harmonic magnetic flux compensation current.By regulating the compensation current injecting into the compensation winding of the reactor, the reactor inductance at different harmonic frequencies can be independently and continuously adjusted. Two generating methods of compensation current are also proposed for the purpose of eliminating detuning or limiting harmonic voltage contents, in which the compensation current is the weighted superposition of filter harmonic currents or voltages and the regulating factor. The experimental results show that the proposed filter enables simultaneously to suppress multiple dominant harmonics and effectively eliminate the detuning.