Pfc shutdown circuit for light load
US-2016105095-A1 · Apr 14, 2016 · US
Pulse width modulation upshift at partial load to improve total harmonic cancellation performance for chiller applications
US10554116B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10554116-B2 |
| Application number | US-201816182792-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 7, 2018 |
| Priority date | Nov 8, 2017 |
| Publication date | Feb 4, 2020 |
| Grant date | Feb 4, 2020 |
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- Title
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Abstract
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A pulse width modulation (PWM) based active harmonic filter (AHF) system including a controller configured to adjust a load on the system from a first to a second load, the first load being greater than the second load, wherein the controller is configured to adjust a frequency of the system from a first to a second frequency when the load is equal to the second load, and wherein the second frequency is greater than the first; a first harmonic compensator configured to filter a first order of harmonics of a load when the load is equal to the second load; and a second harmonic compensator configured to filter a second order of harmonics of the load in parallel with the first order of harmonics when the load is equal to the second load and frequency equals the second frequency, the second order of harmonics being greater than the first order.
First claim
Opening claim text (preview).
What is claimed is: 1. A pulse width modulation (PWM) based active harmonic filter (AHF) system, comprising: a controller configured to adjust a load on the PWM based AHF system from a first load to a second load, the first load being greater than the second load, wherein the controller is configured to adjust a frequency of the PWM based AHF system from a first frequency to a second frequency when the load is equal to the second load, and wherein the second frequency is greater than the first frequency; a first harmonic compensator configured to filter a first order of harmonics of the load when the load is equal to the second load; and a second harmonic compensator configured to filter a second order of harmonics of the load in parallel with the first order of harmonics when the load is equal to the second load and the frequency is equal to the second frequency, the second order of harmonics being greater than the first order of harmonics. 2. The PWM based AHF system according to claim 1 , wherein the load comprises a rectifier front end type variable frequency drive in a high tier chiller. 3. A method of operating a pulse width modulation (PWM) based active harmonic filter (AHF) system, the method comprising: adjusting a load on a PWM based AHF system from a first load to a second load, the first load being greater than the second load; filtering a first order of harmonics of the load when the load is equal to the second load; adjusting a frequency of the PWM based AHF system from a first frequency to a second frequency when the load is equal to the second load, wherein the second frequency is greater than the first frequency; and filtering a second order of harmonics of the load in parallel with the first order of harmonics when the frequency is equal to the second frequency, the second order of harmonics being greater than the first order of harmonics. 4. The method according to claim 3 , wherein the load comprises a rectifier front end type variable frequency drive in a high tier chiller. 5. A pulse width modulation (PWM) based active harmonic filter (AHF) system, comprising: an input line by which upstream current is carried from a grid; an output line by which downstream current is carried toward a load; a controller configured to adjust the load on the PWM based AHF system from a first load to a second load, the first load being greater than the second load, wherein the controller is configured to adjust a frequency of the PWM based AHF system from a first frequency to a second frequency when the load is equal to the second load, and wherein the second frequency is greater than the first frequency; a first harmonic compensator configured to filter a first order of harmonics of the load when the load is equal to the second load; and a second harmonic compensator configured to filter a second order of harmonics of the load in parallel with the first order of harmonics when the load is equal to the second load and the frequency is equal to the second frequency, the second order of harmonics being greater than the first order of harmonics. 6. The PWM based AHF system according to claim 5 , wherein the grid comprises an electrical grid and the load comprises a rectifier front end type variable frequency drive in a high tier chiller.
Assignees
Inventors
Classifications
Inverters therefor · CPC title
having reactive elements actively controlled by bridge converters, e.g. active filters or static compensators [STATCOM] · CPC title
by controlling the electric parameters, e.g. current or voltage · CPC title
Motor control arrangements · CPC title
- H02M1/12Primary
Arrangements for reducing harmonics from AC input or output · CPC title
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- What does patent US10554116B2 cover?
- A pulse width modulation (PWM) based active harmonic filter (AHF) system including a controller configured to adjust a load on the system from a first to a second load, the first load being greater than the second load, wherein the controller is configured to adjust a frequency of the system from a first to a second frequency when the load is equal to the second load, and wherein the second fre…
- Who is the assignee on this patent?
- Carrier Corp
- What technology area does this patent fall under?
- Primary CPC classification H02M1/12. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 04 2020 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).