Method and apparatus for common-mode voltage cancellation
US-2022224301-A1 · Jul 14, 2022 · US
Power conversion system having a plurality of power conversion devices connected in parallel
US12051983B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12051983-B2 |
| Application number | US-201917416599-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 6, 2019 |
| Priority date | Aug 6, 2019 |
| Publication date | Jul 30, 2024 |
| Grant date | Jul 30, 2024 |
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- Title
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- Abstract
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Abstract
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A power conversion system including a plurality of power conversion devices connected in parallel. Each of the plurality of power conversion devices includes: a power conversion circuit configured to convert DC to AC; and an AC filter circuit connected to an output side of the power conversion circuit. The AC filter circuit is an LC low-pass filter including a first filter reactor and an AC filter capacitor connected in an L shape. The AC filter circuit further includes a second filter reactor connected in series to the AC filter capacitor, and a resistance constructing a series circuit together with the AC filter capacitor and the second filter reactor.
First claim
Opening claim text (preview).
The invention claimed is: 1. A power conversion system comprising: a plurality of power conversion devices connected in parallel, each of the plurality of power conversion devices including: a power conversion circuit configured to convert DC to AC; and an AC filter circuit connected to an output side of the power conversion circuit, the AC filter circuit being an LC low-pass filter formed of a first filter reactor and a series circuit, a first end of the first filter reactor being connected to the output side of the power conversion circuit, a second end of the first filter reactor being connected to a power system, the series circuit being formed of an AC filter capacitor, a second filter reactor, and a resistance which are connected in series, the LC low-pass filter being constructed by connecting one end of the series circuit to the second end of the first filter reactor, wherein the resistance is a high-power non-inductive resistor, in which a resistor with a plate-shaped portion having electrode portions at both ends thereof, an insulating plate which insulates the resistor and a heat radiation plate are stacked. 2. The power conversion system according to claim 1 , wherein a resonance frequency of an LC series circuit which is formed of the second filter reactor and the AC filter capacitor is equal to a carrier frequency of the power conversion circuit. 3. The power conversion system according to claim 1 , wherein the AC filter circuit has a gain characteristic including a low-frequency portion, a high-frequency portion, and an intermediate portion between the low-frequency portion and the high-frequency portion, and the gain characteristic has a local maximum between the low-frequency portion and the intermediate portion, and has a local minimum between the intermediate portion and the high-frequency portion.
Assignees
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Classifications
Wind energy · CPC title
Filters comprising mutual inductance · CPC title
using passive filters · CPC title
Dispersed generators · CPC title
Details of control, feedback or regulation circuits · CPC title
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- What does patent US12051983B2 cover?
- A power conversion system including a plurality of power conversion devices connected in parallel. Each of the plurality of power conversion devices includes: a power conversion circuit configured to convert DC to AC; and an AC filter circuit connected to an output side of the power conversion circuit. The AC filter circuit is an LC low-pass filter including a first filter reactor and an AC fil…
- Who is the assignee on this patent?
- Tmeic Corp
- What technology area does this patent fall under?
- Primary CPC classification H02M7/493. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 30 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).