Power control interface between a wind farm and a power transmission system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-009/00
H02J-003/00
출원번호
US-0965478
(2004-10-12)
발명자
/ 주소
Stahlkopf,Karl E.
출원인 / 주소
HECO, Inc.
인용정보
피인용 횟수 :
43인용 특허 :
6
초록▼
A power control interface between an unstable power source such as a wind farm and a power transmission line employs an electrical energy storage, control system, and electronic compensation module which act together like an "electronic shock absorber" for storing excess power during periods of incr
A power control interface between an unstable power source such as a wind farm and a power transmission line employs an electrical energy storage, control system, and electronic compensation module which act together like an "electronic shock absorber" for storing excess power during periods of increased power generation and releasing stored energy during periods of decreased power generation due to wind fluctuations. The control system is provided with a "look ahead" capability for predicting power output (wind speed conditions) and maintaining energy storage or release over a "narrow-band" range despite short duration fluctuations. The control system uses data derived from monitoring the wind farm power output and the power transmission line, and employs system-modeling algorithms to predict narrow-band wind speed conditions. The power control interface can also use its energy storage capacity to provide voltage support at the point of injection into the power transmission system, as well as fault clearance capability for "riding out" transient fault conditions occurring on the power transmission line.
대표청구항▼
The invention claimed is: 1. A power control device adapted to be coupled between a power output of an unstable power source such as a wind farm and a power transmission line, comprising: (a) an electrical energy storage coupled between the unstable power source and the power transmission line to s
The invention claimed is: 1. A power control device adapted to be coupled between a power output of an unstable power source such as a wind farm and a power transmission line, comprising: (a) an electrical energy storage coupled between the unstable power source and the power transmission line to store excess power output from the unstable power source as stored electrical energy when it is above an expected output level, and to release stored electrical energy to add power output to the power transmission line when the power output of the unstable power source is below its expected output level; (b) an electronic controller module coupled to the electrical energy storage which receives a power source data signal derived from monitoring the power output of the unstable power source and generates controller signals for controlling the electrical energy storage indicating when excess power output from the unstable power source above its expected output level is to be stored as electrical energy in the electrical energy storage, and when electrical energy stored in the electrical energy storage is to be released to add power to the power output to the power transmission line. 2. A power control device according to claim 1, wherein the unstable power source is a wind farm providing an AC power output, and the power output is stored in a selected one of the group of electrical energy storage devices consisting of ultracapacitors, capacitors, and batteries. 3. A power control device according to claim 1, wherein the unstable power source is a wind farm providing an AC power output, and the AC power output is converted by an ac-to-dc inverter to direct current (DC) for storage in a DC capacitor array or battery. 4. A power control device according to claim 1, wherein the electronic controller module includes an unstable power source monitoring means, a transmission line monitoring means, and a control calculating means for calculating what the power output of the unstable power source is likely to be over a narrow-band range and for maintaining the release of energy or the storage of energy in the electrical energy storage over the narrow-band range despite power fluctuations of short duration. 5. A power control device according to claim 4, wherein the unstable power source is a wind farm, and the controller module receives data signals derived from monitoring the power output of the wind farm, and data signals derived from monitoring conditions on the transmission line, and the control system employs system-modeling algorithms to predict narrow-band wind speed conditions. 6. A power control device according to claim 5, wherein the controller module's algorithms include prediction based on current data on wind farm output and historical data of wind farm output. 7. A power control device according to claim 1, wherein the electrical energy storage includes an energy storage circuit, a charge controller at an input side of the energy storage circuit for receiving electrical energy therein, and a discharge controller at an output side of the energy storage circuit for electrical energy release. 8. A power control device according to claim 7, wherein the charge controller and the discharge controller act like double-action gates controlled by the controller signals generated by the controller module. 9. A power control device according to claim 7, wherein the unstable power source is a wind farm providing an AC power output, and the power output is stored in a selected one of the group of electrical energy storage devices consisting of ultracapacitors, capacitors, and batteries. 10. A power control device according to claim 9, wherein the electrical energy storage is an array of ultracapacitors arranged to store electrical energy in respective stages. 11. A power control device according to claim 1, further comprising power electronics circuitry for providing voltage support at the point of connection of the wind farm with the power transmission line. 12. A power control device according to claim 11, wherein the power electronics circuitry for providing voltage support is distribution static compensator (D-STATCOM) circuitry. 13. A power control device according to claim 1, wherein the controller module includes a control mode for fault clearance capability for "riding through" a fault condition on the power transmission line using electrical energy stored in said electrical energy storage. 14. A power control device according to claim 13, wherein the controller device receives data signals derived from monitoring the power transmission line, and enables the electrical energy storage to release stored electrical energy to maintain power output to the power transmission line when a fault condition on the power transmission line is detected. 15. A method of operating a power control device adapted to be coupled between a power output of an unstable power source such as a wind farm and a power transmission line, comprising the steps of: (a) monitoring the power output of the unstable power source; (b) determining when the power output of the unstable power source is above its expected output level, and generating a first controller signal indicating that excess power output from the unstable power source above its expected power output level is to be stored as electrical energy in an electrical energy storage; and (c) determining when the power output of the unstable power source is below its expected output level, and generating a second controller signal indicating that stored electrical energy stored in the electrical energy storage is to be released to add power to the power transmission line. 16. A method of operating a power control device according to claim 15, further comprising the step of calculating the likely power output of the unstable power source over a narrow-band range, and generating an appropriate controller signal for maintaining the release of electrical energy from the electrical energy storage or the storage of electrical energy in the electrical energy storage over the narrow-band range despite power fluctuations of short duration. 17. A method of operating a power control device according to claim 16, wherein the power source is a wind farm, and the step of calculating the likely power output of the wind farm and generating an appropriate controller signal is based on monitoring current power output of the wind farm and using historical wind farm data, and employing system-modeling algorithms to predict narrow-band wind farm output based thereon. 18. A method of operating a power control device according to claim 16, wherein the power source is a wind farm, and the step of calculating the likely power output of the wind farm and generating an appropriate controller signal is performed so as to automatically smooth power output fluctuations when the fluctuations are large increases or decreases from a design-rated wind speed range and extend over a design-rated time window in order to prevent operation in an "out-of-sync" condition. 19. A method of operating a power control device according to claim 16, wherein the power source is a wind farm, and the step of calculating the likely power output of the wind farm and generating an appropriate controller signal is performed so as to provided a "look ahead" capability to predict the likely wind speed conditions within the narrow band range and maintain the power output released from or stored in the electrical energy storage in a mode consistent with the predicted wind speed conditions despite sharp duration or small wind speed changes. 20. A method of operating a power control device according to claim 16, wherein the power source is a wind farm, and the step of calculating the likely power output of the wind farm and generating an appropriate controller signal is performed with a Transmission Line Control Signal Calculator which processes signals derived from monitoring the status of the power transmission line, and a Wind Prediction Control Signal is generated based on Wind Speed Monitor Data and Historical Wind Profile Data for judging whether current power generation conditions will rise above or fall below the normal power output range for the wind farm.
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이 특허에 인용된 특허 (6)
Hendrik Lambertus Lagerwey NL, DC local grid for wind farm.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein; Mahalatkar, Kartikeya; Hou, Yongxi; Bowers, Todd; Stahlkopf, Karl E., Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Stahlkopf, Karl E.; Fong, Danielle A.; Crane, Stephen E.; Berlin, Jr., Edwin P.; Pourmousa Abkenar, AmirHossein, Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange.
Kondo, Shinichi; Ono, Yasunori; Uchiyama, Noriyuki; Ichinose, Masaya; Matsutake, Mitsugu; Aihara, Takashi, Controller and control method for a wind farm including a plurality of wind turbine generators.
Taimela, Pasi; Olivo, Tony; Johnson, Jr., Robert William; Moorehead, Doug, Island grid power supply apparatus and methods using energy storage for transient stabilization.
Helle, Lars; Nielsen, John Godsk; Jensen, Mark James, Method for operating a wind turbine connected to a utility grid during a utility disturbance, wind turbine and wind park.
Liu, Zhenya; Shu, Yinbiao; Sun, Xin; Gao, Liying, Wire connecting method and converter station for ultra-high voltage direct current power transmission, and ultra-high voltage direct current power transmission system.
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