Based On The String And Type Of Dsp-controlled Single-tuned Filter Research And Design

With development of modern electronic technology ,a number of non-linear electronic devices are used in electronic power network ,which cause heavy harmonic pollution.The installment of passive filter is a widespread method for harmonic suppression in industry. The passive filter has some advantages such as large capability ,sinple structure ,low operation and so on . But the passive filter is easily affected by the power network impedance characteristics, and it is bad at dynamic compensation effect.This paper designs a controllable single tuned filter with series-parallel connection based on DSP, which is improved based on traditional passive filter.The control system of single tuned filter can analyse harmonic component by tracking electric voltage and current in the power network real-timely, then regulate the controllable reactor to make the single tuned filter run in resonant frequency to fitter harmonic; At the same time,the controllable reactor is coupling windings too, which is connected between the filter and electrical source, It can protect electrical source from harmonic. The control system,including harmonic measurement, controlling algorithm and controlling process, is accomplished by DSP processor TMS320F2812,the controlling algorithm is a improved method for detecting single harmonic. By adjusting controllable reactor, the passive filter in this paper has high controlling effect and fast response.