US6969922B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformerless, load adaptive speed controller
Assignee: Switch Controls and Converters Inc
•
Filing: 2005-02-25
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Granted: 2005-11-29
•
Expires: 2025-02-25
Abstract
Abstract The invention in one embodiment is an improved variable speed engine/generator set with an integrated power conditioning system and control method including load shedding to generate high quality AC power with improved fuel efficiency and reduced emissions. The variable speed generator control scheme allows for load adaptive speed control of engine and generator field. The transformerless power inverter topology and control method provides the necessary output frequency, voltage and/or current waveform regulation, harmonic distortion rejection, and provides for single phase, or unbalanced loading.
Inventors
- 👤 Richard Shaun Welches
- 👤 Daniel P. Hohm
- 👤 Jian Wen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:31
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/48; H02J; H02J3/00; H02J3/28; H02J3/30; H02J9/00; H02J9/04; H02J9/06; H02J9/062; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02J3/001; H02J3/00125; H02J3/01; H02J3/18; H02J3/1821; H02J3/1835; H02J3/1864; H02P2101/00; H02P2101/45; Y; Y02; Y02E; Y02E40/00; Y02E40/40; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
103 words
A method for producing quality AC output power to a load, comprising: measuring a set of properties of an actual load output; measuring a speed of a variable speed energy generating device; calculating a speed command signal using said speed and said properties; converting said speed command signal into a throttle adjustment signal; and adjusting said speed of said variable speed energy generating device using said throttle adjustment signal, thereby adjusting said AC output power to said load and responding to an increased load by calculating a load shed term and reducing a portion of said load based on said load shed term.
Claim 2
Independent Claim
103 words
A method for producing quality AC output power to a load, comprising: measuring a set of properties of an actual load output; measuring a speed of a variable speed energy generating device; calculating a speed command signal using said speed and said properties; converting said speed command signal into a throttle adjustment signal; and adjusting said speed of said variable speed energy generating device using said throttle adjustment signal, thereby adjusting said AC output power to said load and responding to an increased load by calculating a load shed term and reducing a portion of said load based on said load shed term.
Claim 3
Dependent Claim
24 words
The method according to claim 1 , wherein said portion is a percentage of a power margin of said variable speed energy generating device.
Claim 4
Dependent Claim
22 words
The method according to claim 1 , further comprising responding to an increased load by setting said speed command at a maximum.
Claim 5
Dependent Claim
40 words
The method according to claim 1 , further comprising responding to an increased load by calculating a load shed term, reducing a portion of said load based on said load shed term, and setting said speed command at a maximum.
Claim 6
Dependent Claim
28 words
The method according to claim 1 , further comprising measuring a throttle position and calculating said speed command signal using said speed, said properties, and said throttle position.
Claim 7
Dependent Claim
33 words
The method according to claim 1 , wherein said set of properties is selected from the group consisting of: voltages of each phase, currents of each phase, and phase angles of each phase.
Claim 8
Dependent Claim
24 words
The method according to claim 1 , further comprising regulating a generator of said variable speed energy generating device by adjusting a field voltage.
Claim 9
Dependent Claim
16 words
The method according to claim 1 , further comprising applying an adaptive speed loop gain algorithm.
Claim 10
Dependent Claim
21 words
The method according to claim 1 , further comprising responding to an increased load by decreasing an inverter output AC voltage.
Claim 11
Independent Claim
105 words
A method for regulating a variable speed generator coupled to a load, comprising: measuring an actual load output; measuring a speed of said variable speed generator; deriving a speed command signal from said measuring; converting said speed command signal into a throttle adjustment signal; adjusting said speed of said variable speed generator using said throttle adjustment signal; inverting an output of said variable speed generator thereby producing an AC power generation and responding to a decrease in said speed and an increase in an output current by calculating a load shed term and reducing a portion of said load based on said load shed term.
Claim 12
Independent Claim
105 words
A method for regulating a variable speed generator coupled to a load, comprising: measuring an actual load output; measuring a speed of said variable speed generator; deriving a speed command signal from said measuring; converting said speed command signal into a throttle adjustment signal; adjusting said speed of said variable speed generator using said throttle adjustment signal; inverting an output of said variable speed generator thereby producing an AC power generation and responding to a decrease in said speed and an increase in an output current by calculating a load shed term and reducing a portion of said load based on said load shed term.
Claim 13
Dependent Claim
20 words
The method according to claim 10 , further comprising deriving a second speed command and calculating a load shed term.
Claim 14
Dependent Claim
30 words
The method according to claim 10 , further comprising shedding a portion of said load and increasing said speed command as a fast response to an increase in said load.
Claim 15
Dependent Claim
20 words
The method according to claim 10 , further comprising responding to an increased load by boosting said variable speed generator.
Claim 16
Dependent Claim
19 words
The method according to claim 10 , wherein said speed command is derived using at least one look-up table.
Claim 17
Dependent Claim
14 words
The method according to claim 10 , further comprising applying an offset speed command.
Claim 18
Dependent Claim
18 words
The method according to claim 10 , further comprising measuring a throttle position of said variable speed generator.
Claim 19
Dependent Claim
19 words
The method according to claim 10 , further comprising applying an external overload warning signal prior to an overload.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-11-28 | 2009-05-30 | 2009-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-11-28 | 2013-05-30 | 2013-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-11-28 | 2017-05-30 | 2017-11-29 | $7700.00 | Window Closed / Lapsed |