Abstract
This paper introduces a new approach for active power filters LCL filter insertion loss calculation, treating it as two port T-network and describing it using scattering and impedance parameters. There is proposed usage of line impedance stabilization network in frequency range over 9kHz to enable insertion loss calculation neglecting mains impedance. In the study, importance of parasitic elements of LCL filter components is analyzed.DOI: http://dx.doi.org/10.5755/j01.eee.18.9.2799
Highlights
Voltage source active power filters (APF) with, L type supply filters do not always sufficiently attenuate switching ripple currents, caused by the pulse width modulated (PWM) voltage
LCL filters employed for active power filters are typically calculated to meet the electromagnetic compatibility (EMC) regulations for harmonic current emissions
LCL filter can be described as twoport network using impedance parameters and S-parameters, which enables insertion loss (IL) calculation to predict filter performance in high frequency range
Summary
Voltage source active power filters (APF) with, L type supply filters do not always sufficiently attenuate switching ripple currents, caused by the pulse width modulated (PWM) voltage. There are lacks of publications related to LCL filter insertion loss (IL) estimation from electromagnetic compatibility (EMC) point of view. In [6] IL dependence are analyzed point of view of inductance slit ratio of LCL filter, but in IL calculation source impedance are ignored that significantly changes the IL calculation precision. LCL filter parasitics are ignored that has great impact on IL in high frequency region. These both factors are taken into account in current paper to examine simple LCL filter capability to satisfy EMC legislation. LCL filter is designed using guidelines given in [5], [6], for APF prototype and its insertion loss is calculated and analyzed taking into account filter component parasitic parameters
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