DESIGN AND PERFORMANCES OF COUPLING PASSIVE FILTERS IN THREE-PHASE SHUNT ACTIVE POWER FILTERS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2011, Vol 35, Issue 35
Abstract
The passive interface filter represents the link between the power grid and the shunt active filter. The interface filter is used both to obtain a good dynamic of the compensating current and to limit the high frequency harmonics due to the power semiconductor devices switching. To obtain an efficient rejection of these harmonics while passing the necesary compensating harmonics, the interface filter must achieve two contradictory conditions, that is, to have a low inductance and a steep frequncy response over the highest harmonic frequency. The second order filters meet these goals, but with the price of instabilty. This paper aims to find an optimal compromise between interface filter stability and the limitation of the power dissipated by the used damping resistors, while achieving maximum performance of the active filtering. A secondary role assigned to the damping resistors is to avoid the operation of the LCL interface filter as a passive harmonics filter connected to the power grid, an undesirable effect which can occur under certain conditions. By proper design of the interface filter, the active filtering performance can increase by several orders of magnitude, without having to increase the compensating capacitor voltage, in the DC circuit of the active filter.
Authors and Affiliations
Constantin Vlad SURU, Alexandru BITOLEANU
Keywords
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