A Partially Rated LC Trap Type AC Filter for Grid-Tied Voltage Source Converters

A Partially Rated LC Trap Type AC Filter for Grid-Tied Voltage Source Converters

<inline-formula><tex-math notation="LaTeX">$AC$</tex-math></inline-formula> power filters play an important role in limiting the high-frequency current harmonics injected by grid-tied voltage source converters (VSCs). Amongst the various types of filters, <inline...

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Bibliographic Details
Main Authors: Srinivas Gulur, Vishnu Mahadeva Iyer, Subhashish Bhattacharya
Format: Article
Language:English
Published: IEEE 2024-01-01
Series:IEEE Open Journal of Power Electronics
Subjects:
Differential mode (DM) filter
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<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$L\text{-}C\text{-}TL$</tex-math> </inline-formula> </named-content> filter
<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$LC$</tex-math> </inline-formula> </named-content> trap filter
<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$LLCL$</tex-math> </inline-formula> </named-content> filter
<named-content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="LaTeX">$LT\text{-}C\text{-}L$</tex-math> </inline-formula> </named-content> filter
Online Access:https://ieeexplore.ieee.org/document/10545602/
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Description
Summary:<inline-formula><tex-math notation="LaTeX">$AC$</tex-math></inline-formula> power filters play an important role in limiting the high-frequency current harmonics injected by grid-tied voltage source converters (VSCs). Amongst the various types of filters, <inline-formula><tex-math notation="LaTeX">$LCL$</tex-math></inline-formula> filters with integrated <inline-formula><tex-math notation="LaTeX">$LC$</tex-math></inline-formula> traps have become popular due to their ability to achieve a size reduction of the grid side inductor while demonstrating a similar current harmonic mitigation performance as a traditional <inline-formula><tex-math notation="LaTeX">$LCL$</tex-math></inline-formula> filter. In this article, a passively damped filter network with a partially rated <inline-formula><tex-math notation="LaTeX">$LC$</tex-math></inline-formula> trap (also referred to as the <inline-formula><tex-math notation="LaTeX">$L\text{-}PT\text{-}L$</tex-math></inline-formula> filter) is proposed and delineated. The proposed <inline-formula><tex-math notation="LaTeX">$L\text{-}PT\text{-}L$</tex-math></inline-formula> filter provides a <inline-formula><tex-math notation="LaTeX">$-60\;\text{dB/dec}$</tex-math></inline-formula> roll-off characteristics at frequencies greater than switching frequency. Additionally, it is also demonstrated that this proposed <inline-formula><tex-math notation="LaTeX">$L\text{-}PT\text{-}L$</tex-math></inline-formula> filter has smaller voltage ratings for two of its shunt-connected capacitor components due to the specific placement of the damping resistor. A systematic analysis of the proposed <inline-formula><tex-math notation="LaTeX">$L\text{-}PT\text{-}L$</tex-math></inline-formula> filter is elucidated to design and select the component parameters. Steady-state and transient experimental results captured from a grid-tied 2-Level, 3<inline-formula><tex-math notation="LaTeX">$\phi$</tex-math></inline-formula> VSC prototype are provided to validate the grid current harmonic filtering capability, reduced voltage ratings of the two shunt capacitors and passive damping performance of the proposed <inline-formula><tex-math notation="LaTeX">$L\text{-}PT\text{-}L$</tex-math></inline-formula> filter. The proposed approach can achieve 19&#x0025; and 36&#x0025; filter shunt branch volume reduction for low voltage (208 V, 60 Hz) and medium voltage (4.16 kV, 60 Hz) grid-tied inverter systems, respectively, compared to state-of-the-art <inline-formula><tex-math notation="LaTeX">$LCL$</tex-math></inline-formula> filters with integrated <inline-formula><tex-math notation="LaTeX">$LC$</tex-math></inline-formula> traps.
ISSN:2644-1314

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