Active electric filter by mixed harmonic detection

Abstract

The invention consists of main circuit of active power filter, and mixed type harmonic-testing circuit. The mixed type harmonic-testing circuit integrates advantages of analog and digital control that can either avoid error of digital sampling to signal containing high frequency component, or simplify DSP to extract the fundamental component of load circuit, so that the time delay introduced by digital control is limited in fundamental frequency. At the above bases, through algorithm for fundamental wave based synchronous rotating coordinates, the phase compensation strategy is introduced, which solves the problem of time delay caused by digital control.

Description

technical field [0001] The invention relates to a power harmonic filtering device, and further relates to an active power filter adopting hybrid harmonic detection. Background technique [0002] The problem of power grid harmonics has attracted widespread attention, and many countries and regions have formulated their own harmonic standards. In 1993, my country also passed the "Power Quality Harmonics of Public Power Grids" (GB / T-14594-93), which is used to limit the harmonic pollution of power supply systems and electrical equipment. With the development of power electronics technology, the power active filter, as a power electronic device that dynamically suppresses harmonics and compensates reactive power, can compensate harmonics and reactive power that vary in size and frequency, and can effectively compensate Insufficient of the traditional passive filter, it is a kind of promising harmonic suppression device, and has entered the practical stage. Among them, the para...

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Problems solved by technology

However, these methods have brought the defects of complex design and high cost, which has caused obstacles to the further promotion of active power filters, especially in domestic applications.

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