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Design and Analysis of Output Filter for UPS Inverter
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| Author(s) |
J. Kim; J. Choi; F. Blaabjerg |
| Abstract |
This paper proposes a design method of the L-C output filter for UPS inverter. There are
two kinds of harmonic sources that make the UPS output voltage waveform be distorted: One is
caused by the PWM switching of inverter but most of it can be eliminated by inserting the L-C filter in
the output side of inverter. The other is caused by the nonlinear characteristics of the load current. If
the output impedance of the UPS inverter is almost zero, then the output voltage waveform may be
independent on the nonlinear load current characteristics. But the configuration of the power circuit
with L-C filter cannot meet the zero-output impedance at all. The feedback controller complements the
harmonic distortion due to the nonlinear load current. But the design value of L-C filter and the system
performance of the controller are coupled each other and it is difficult to design the L-C filter
considering the system performance of the controller in the conventional method. In this paper, the
harmonic components caused by two different sources are analyzed separately based on the transfer
function described as the closed form. The filter value can be calculated with the given value of
system time constant determined by the switching frequency, the speed of control processor, and the
controller gain. A design procedure is described by a single flow chart and explained step by step. The
validity of the proposed filter design algorithm is verified through the simulation and experiments. |
| Download |
| Filename: | EPE2001 - PP00753 - Choi.pdf |
| Filesize: | 123.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-11 by System |
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