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基于DSP的串并型可控单调谐滤波器的研究与设计
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摘要
随着现代电子技术的发展,各种非线性电子装置的大量应用,向电力系统中注入了大量的谐波。装设无源滤波器进行谐波抑制已成为工业中普遍采用的方法。无源滤波器具有容量大、结构简单、成本低等优点;但无源滤波器容易受电网阻抗的影响,动态补偿效果较差。
     本文中设计的基于DSP的串并型可控单调谐滤波器对传统的无源滤波器进行了改进,通过实时跟踪电网中的电压、电流,对其分析各次谐波含量,然后调节可控电抗器的电感值,使滤波支路在某次谐波频率处发生谐振,从而达到滤除谐波的目的。同时系统中接入的可控电抗器也是一个耦合电感,一部分接入电源侧,另一部分接入滤波支路;当谐波流入电源侧时,接入电源侧的可控电抗器能够起到很好的抑制作用。其中控制部分即谐波检测、控制算法及控制过程都是通过DSP芯片TMS320F2812实现,本文中的控制算法是一种改进的单次谐波检测法。本设计中利用DSP控制可控电抗器能够使无源滤波器达到较高的可控性和快速响应性。
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.
引文
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