With the wide application of power electronic devices and put into operation a large number of non-linear load,Harmonic pollution in power systems have become increasingly serious.Traditional LC filter device with a simple,But has some limitations.Power electronics technology,Control for power system harmonics provides a new method.Active filter technology can use the grid to suppress the harmonic,Improve the power line current waveform,Can compensate reactive power grid,Improve the power factor of the grid.
Active power filter compensation due to the dynamic power in the harmonics, and the response speed and is becoming the most effective pollution control equipment harmonic one. Active power filter harmonic suppression is very effective as the current measures of its great value.
In this paper, passive filters and active filter for a more comprehensive comparison, from the principles of the analysis of active power filter harmonic suppression principle. Active power filter harmonic current detection is the key link in the accuracy of detection of harmonic currents, affecting the filtering effect of active filters. This paper focuses on the instantaneous harmonic detection research status and a variety of detection methods more detailed analysis and research in order to shunt APF final target, based on instantaneous reactive power theory of ip, iq France, the use of PSIM simulation software established simulation model, simulation results largely achieved the expected results.
Keywords:Active power filter; Instantaneous reactive power theory; instantaneous reactive power ;PSIM simulation