Double tuned filter designer series#

Active filters have the advantage to respond to dynamic changes in the electrical distribution systems ( Fuchs and Masoum, 2008). Specifically, active filters correct for the distorted sinusoidal current waves to effectively eliminate harmonics. 2.ДЄctive filters rely on active power conditioning electronic devices to compensate for unfavorable harmonic currents. Some potential issues can occur with passive systems if not properly selected resulting in resonance circuits parallel with power source leading to worse power quality conditions. They are tuned to provide a low impedance path for specific currents with undesirable harmonic frequencies. Passive filters are made up of reactive components like capacitors, inductors, and resistors. There are three main classifications of filters: (1) passive, (2) active, and (3) hybrid filters: 1. Specifically, harmonic filters are designed to have low impedances to ensure that the harmonic currents are flowing between the loads and the filters, rather than reaching the power source and the other components of the electrical power generation and distribution systems. Power harmonic filters are mainly used to either block harmonic currents from flowing through electrical power distribution systems or locally isolate and cancel them ( Fuchs and Masoum, 2008). Because damped filters have significantly higher resistance than single- or double-tuned filters, they are usually not used to filter harmonics near the power frequency so that filter losses can be maintained at low values. In general, damped filters are tuned in between the corresponding pairs of harmonics (11th and 13th, 17th and 19th, etc.) to provide the maximum harmonic reduction at those frequencies while continuing to serve as a (not quite as effective) filter bank for frequencies higher than the tuned frequency. Because most capacitors have a negative temperature coefficient (capacitance decreases and therefore tuned frequency increases with temperature), tuning slightly lower than the desired frequency is desirable.Дamped filters are typically used to control higher-order harmonics as a group. 2.ДЄll electrical components have some non-zero temperature coefficient, and capacitors are the most temperature sensitive component in a tuned filter. This action can quickly overload the filter.

Double tuned filter designer series#

The reasons for this practice are as follows: 1.ДЇor a low-resistance series resonance filter that is exactly tuned to a harmonic frequency, the filter bank will act as a sink to all harmonics (at the tuned frequency) in the power system, regardless of their source(s). In most cases, it is common to tune single-tuned filter banks to slightly below (typically around 5%) the frequency of the harmonic to be removed.