[특허]Method and control apparatus for static VAR generator and compensator

Method and control apparatus for static VAR generator and compensator 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-003/18
출원번호	US-0535629 (1974-12-23)
발명자 / 주소	Gyugyi Laszlo (Pittsburgh PA) Brennen Michael B. (Pittsburgh PA)
출원인 / 주소	Westinghouse Electric Corporation (Pittsburgh PA 02)
인용정보	피인용 횟수 : 33 인용 특허 : 0

초록 ▼

A static VAR generator circuit having a control system adapted to utilize the values of three phase load currents to generate time delayed firing angles for thyristor controlled inductors which are utilized with parallel capacitors to provide unity power factor and balanced electrical currents to the AC source. The time delayed firing angles are calculated from integrating furnace load currents over prescribed intervals during real time to thus maintain balanced load current at specified phase angles, usually zero, in the three phase system.

대표청구항 ▼

Apparatus for providing reactive power to an alternating current electrical system which includes three electrical conductors, where there is a first alternating voltage of predetermined frequency present between a first and a second of the conductors, a second alternating voltage of said frequency present between the second and a third of said conductors, and a third alternating voltage of said frequency present between the third and the first of said conductors, first, second and third terminal voltages each of which is present respectively between said first, second and third conductors and a common electrical reference point, said electrical system also including a primary source of alternating electrical power connected to the three conductors, said electrical system also including an electrical load connected to the three conductors, the first, second and third terminal voltages having first, second and third peak magnitudes respectively and a given phase relationship relative to each other for a given period of time, comprising: b. a reactive power generator having a first output terminal thereof electrically connected to a place on said first conductor between said load and said primary source and having a second output terminal thereof electrically connected to a place on said second conductor between said load and said primary source, a first alternating load current of said frequency flowing in said first conductor between said place thereon and said load, a second alternating load current of said frequency flowing in said second conductor between said place thereon and said load, said reactive power generator providing a compensating current of said frequency at said first output terminal during a switch controlled portion of a given half cycle of said first alternating voltage, said compensating current being vectorially added to said first alternating load current, a first alternating primary source current of said frequency which flows in said first conductor between said primary source and said place where said first output terminal is connected to said first conductor thus being in predetermined fixed phase relationship with said first terminal voltage for a half cycle, said switch controlled portion being related to a calculated switch delay; and b. calculator and sensor means for sensing values of said load currents and said voltages and calculating said switch delay as a function thereof, said calculator and sensor means being connected to said reactive power generator for switching said reactive power generator to thus provide said portion of said compensating current according to the following relationship: switch delay beiNg related to the integration of said second load current over the interval of that positive half cycle of said second alternating voltage preceding the switching of said reactive power generator, and the integration of said first load current over the interval of that positive half cycle of said third alternating voltage preceding the switching of said reactive power generator, said switch delay being measured from a point in time when the next following positive peak of said first alternating voltage occurs, all integrations being made with respect to said frequency times time.

이 특허를 인용한 특허 (33)

Fishkin Theodore S. (Lawndale CA) Skidmore Mark (Long Beach CA) Dimitrijevic Peter (Redondo Beach CA), Antenna test and measurement system.
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Depenbrock Manfred (Bochum DEX), Circuit and method for controlling reactive load currents of a three-phase system.
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Gyugyi Laszlo (Pittsburgh PA), Control for VAR generator with deadband.
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Hebenstreit, Andreas, Determining a state of a receiver on a transmission line.
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Noro, Yasuhiro; Kudo, Kenji; Sato, Yoshihisa, Difference power adjustment apparatus having a capacitor and reactor connected power-system bus.
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Mulcahy Joseph A.,CAX ; Tadesse Dawit,CAX ; Rajda Janos,CAX ; Kojori Hassan Ali,CAX, Electric arc furnace controller.
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Kitamura, Hitomi; Shimomura, Masaru, Excitation control device and excitation control method.
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Othman Hisham A. ; Vedam Rajkumar, Flicker controllers using voltage source converters.
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Rosa John (Penn Mills PA) Gyugyi Laszlo (Penn Mills PA), Gating circuit for high voltage thyristor strings.
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Gyugyi Laszlo (Pittsburgh PA), Hybrid switched-capacitor controlled-inductor static VAR generator and control apparatus.
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Brennen Michael B. (Pittsburgh PA) Abbondanti Alberto (Penn Hills Township ; Allegheny County PA), Line fault tolerant synchronous timing reference generator for static VAR generators.
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Huff,Frederick C.; Cheng,Xu; Francino,Peter N., Method and apparatus for providing economic analysis of power generation and distribution.
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Wobben, Aloys, Method of reactive power regulation and aparatus for producing electrical energy in an electrical network.
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Vithayathil John J. (3814 NE. 136th Pl. Portland OR 97230), Scheme for rapid adjustment of network impedance.
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Gyugyi, Laszlo, Static VAR generation for transmission line compensation.
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Gyugyi Laszlo (Penn Hills PA), Static VAR generation for transmission line compensation of subsynchronous resonance.
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Gyugyi Laszlo (Penn Hills PA), Static VAR generator.
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Whyte Ian A. (Churchill PA), Static VAR generator.
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Gyugyi Laszlo (Penn Hills PA) Brennen Michael B. (Wilkins Township ; Allegheny County PA) Putman Thomas H. (Penn Hills PA), Static VAR generator compensating control circuit and method for using same.
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Gyugyi, Laszlo, Static VAR generator having reduced harmonics.
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Gyugyi, Laszlo, Static VAR generator system having improved response time.
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Gyugyi Laszlo (Pittsburgh PA) Wood Peter (Murrysville PA), Static VAR generator with discrete capacitive current levels.
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Gyugyi Laszlo (Penn Hills PA) Brennen Michael B. (Wilkins Township ; Allegheny County PA), Static VAR generator with non-linear frequency dependent dynamic gain adjuster.
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Brennen Michael B. (Wilkins Township ; Allegheny County PA) Gyugyi Laszlo (Penn Hills Township ; Allegheny County PA) Stacey Eric J. (Penn Hills Township ; Allegheny County PA), Static VAR generators.
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Brennen Michael B. (Wilkins Township ; Allegheny County PA) Gyugyi Laszlo (Penn Hills Township ; Allegheny County PA) Stacey Eric J. (Penn Hills Township ; Allegheny County PA), Static VAR generators.
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Sedighy,Mohammad; Ma,Thomas Lai Wai, System and method for controlling electrical power across multiple furnaces using variable reactors.
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Sedighy,Mohammad; Ma,Thomas Lai Wai, System and method for controlling power across multiple electrodes in a furnace.
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Lai Wai Ma,Thomas, System and method for controlling total electrical power across multiple furnaces using electrode positioning.
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Zhang, Zhigao; Zheng, Zhishou; Qu, Qingchang, Three-phase electric energy measurement apparatus.
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Gyugyi Laszlo (Penn Hills Township ; Allegheny County PA), VAR Generator having controlled discharge of thyristor switched capacitors.
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Rosa John (Penn Hills PA) Gyugyi Laszlo (Pittsburgh PA), VAR Generator with current sensitive inductance break point.
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Brennen Michael B. (Pittsburgh PA) Gernhardt Mark G. (Herminie PA), VAR generator system with minimal standby losses.
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Brennen Michael B. (Wilkins Township ; Allegheny County PA) Gyugyi Laszlo (Penn Hills PA), Voltage regulator and flicker compensator.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Method and control apparatus for static VAR generator and compensator 원문보기

초록 ▼

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Method and control apparatus for static VAR generator and compensator 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (33)

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