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Publication Title | United States Patent Gupta etal. METHOD AND APPARATUS FOR CONTROLLING OUTPUT CURRENT OF TURBINE/ALTERNATOR ON COMMON SHAFT

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Text | United States Patent Gupta etal. METHOD AND APPARATUS FOR CONTROLLING OUTPUT CURRENT OF TURBINE/ALTERNATOR ON COMMON SHAFT | 001



(12)United States Patent Gupta etal.

(54) METHOD AND APPARATUS FOR CONTROLLING OUTPUT CURRENT OF TURBINE/ALTERNATOR ON COMMON SHAFT

(75) Inventors: SureshC.Gupta,LosAlamitos,CA (US); Douglas R. Burnham, Stuart, FL

(US); J. Michael Teets, Hobe Sound, FL (US); Jon W. Teets, Scottsdale,AZ (Us)

(73) Assignee: ElliottEnergySystems,Inc.,Stuart, FL (US)

US 6,998,728B2

(*) Notice:

Subjecttoanydisclaimer,thetermofthis patent is extended or adjusted under 35 U.S.C. 154(b) by 284 days.

(Continued) FOREIGN PATENT DOCUMENTS

0 742 634 A2 11/1996

(Continued)

OTHER PUBLICATIONS

(21) Appl.No.:10/678,386

EP

(2) Filed:

Oct.3,2003

(Under 37 CFR 1.47)

Prior Publication Data US 2004/0066176A1 Apr.8,2004

Related US. Application Data

(60) DivisionofapplicationNo.10/466,386,?ledonMay 28, 2003, Which is a continuation of application No. 09/840,572, ?led on Apr. 23, 2001, noW Pat. No. 6,605,928, Which is a continuation of application No. 09/319,390, ?led as application No. PCT/US97/ 22405 on Dec. 3, 1997.

(60) ProvisionalapplicationNo.60/032,149,?ledonDec. 3, 1996.

(58) Field of Classi?cation Search .. 290/1 A,

290/2,40 C,52; 322/14,27,36 See application ?le for complete search history.

cOMPREssoR

_TURB|NE ALTERNATOR

L2 L3 INSTRUMENTS START ALTERNATOR

(65)

(51) Int.Cl. H02P 9/04

(2006.01)

(52) U.S. Cl. .. 290/52; 290/1 A; 290/40 c;

322/27;322/36

acoNTRoLs POWER i l 1

ELECTRICAL SYSTEM

OUTPUT POWER

(56)

ReferencesCited U.S. PATENT DOCUMENTS

3,613,360 A 3,775,663 A 4,625,125 A 4,841,216 A 4,862,009 A 4,992,721 A 5,065,086 A 5,119,071 A 5,387,859 A RE34,962 E 5,428,275 A

10/1971 HoWes 11/1973 Turnbull 11/1986 Kuwabara

6/1989 Okadaetal. 8/1989 King 2/1991 Latos

11/1991 Takakado 6/1992 Takezawa et al. 2/1995 Muruganeta1. 6/1995 Shekletonet81. 6/1995 Carreta1.

US006998728B2

(10)Patent N0.:

(45)Date ofPatent: Feb.14,2006

Yasuo FujikaWa, “Transportable Micro Gas Turbine Gen erator”, Shinko Electric Journal, No. 143, vol. 41, Sep. 20, 1996.

Primary Examiner—Nicholas Ponomarenko (74)Attorney,Agent, orFirm—The Webb LaW Firm

(57) ABSTRACT

An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator Windingofthealternator.A controlcircuitduringastart-up mode switches the inverter circuit to the stator Winding of the alternator and during a poWer out mode sWitches the inverter circuit to the output circuit. During the poWer out mode, current data is sensed and is used for current limit and/or poWer balancing.

17 Claims, 6 Drawing Sheets

-————>-CONTROL PANEL

LINE TlE DATA ‘NPUT

—~——-THREE-PHASE USER POWER

OUTPUT

Image | United States Patent Gupta etal. METHOD AND APPARATUS FOR CONTROLLING OUTPUT CURRENT OF TURBINE/ALTERNATOR ON COMMON SHAFT



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