注入式混合型有源滤波器的参数设计及工程应用

研制出一种注入式混合型有源滤波器,重点介绍了各组成部分的设计方法以及工程应用中的注意事项。无源滤波器包括单调谐滤波器和注入式滤波器,可按投资费用最小的方法设计,具体参数设计包括电容器、电抗器的容量和数值,最佳品质因数。耦合变压器的设计包括电压、电流、容量、联接组、变比等。输出滤波器调谐频率确定后,不能简单按照投资费用最小法设计电容和电感,而需要考虑整个系统的阻抗。有源滤波器的设计主要包括大功率逆变器的实现和直流侧电容的选取。控制器采用双DSP的数字化控制方案,其中TMS320F240主要实现与外电路的联系,TMS320C32专门用于实现大量复杂数据的计算。实际工程应用效果表明,投入注入式混合型有源滤波器后,电网电流波形由畸变波形改善为接近正弦波,电流中的谐波分量大幅减少。

Parameter design and engineering application of injection-type hybrid active power filter

An injection-type hybrid active power filter is developed,with parameter designs for each component and cautions in engineering application emphasized.For the passive filters,including mono-tuning passive filter and injection-type passive filter,the magnitudes and optimal quality factors of capacitor and reactor can be designed with the minimum cost method.For the coupling transformer,the design of its voltage,current,capacity,groups and turn ratio are introduced.With the decided tuning frequency of output filter,the capacitance and inductance are not simply determined by the minimum cost method,the system impedance must be considered.For the active power filter,the implementation of high-power inverter and the selection of capacitor at DC side are focused.The digital controller employs double-DSP solution,in which TMS320F240 interfaces with external circuits,while TMS320C32 handles complex computations.Engineering applications show that,with the injection-type hybrid active power filter,the distorted system current is almost recovered into sine wave and the current harmonic components decrease greatly.