System and process for controlling active power in a power generation plant
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-009/00
H02P-009/04
H02J-003/06
H02J-003/38
출원번호
US-0153496
(2011-06-06)
등록번호
US-8928163
(2015-01-06)
우선권정보
ES-201030868 (2010-06-04)
발명자
/ 주소
Arlaban Gabeiras, Teresa
Alonso Sadaba, Oscar
Garcia Sayes, Jose Miguel
Royo Garcia, Ricardo
Nuñez Polo, Miguel
출원인 / 주소
Acciona Windpower, S.A.
대리인 / 주소
Gardner Groff Greenwald & Villanueva, PC
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
The present invention describes a process for controlling the active power injected into the grid by a generating plant for contributing to the stability of the power grid in the event of frequency variations where, in response to a deviation in grid frequency, each generating unit calculates an act
The present invention describes a process for controlling the active power injected into the grid by a generating plant for contributing to the stability of the power grid in the event of frequency variations where, in response to a deviation in grid frequency, each generating unit calculates an active power variation parameter generated based on a first parameter stored in said generating unit, said first parameter being representative of a respective contribution of said generating unit to a required variation in total active power of the generating plant, and where a central control unit of the generating plant connected to each generating unit updates the value of the first parameters when changes are produced therein.
대표청구항▼
1. Process for use in a distributed power generation plant (1) formed by at least two generating units (2), the process comprising: prior to a deviation in grid frequency, calculating by means of a central control unit of the generating plant connected to each generating unit, a first parameter repr
1. Process for use in a distributed power generation plant (1) formed by at least two generating units (2), the process comprising: prior to a deviation in grid frequency, calculating by means of a central control unit of the generating plant connected to each generating unit, a first parameter representative of a respective contribution of said generating unit to a requirement in total active power variation of the generating plant if a potential grid frequency event occurs, where the first parameter is selected from the group consisting of Ki, Ci, or a combination thereof,sending the first parameter to said generating unit,updating an active power regulator of each generating unit with the first parameter, andcalculating in response to the deviation in grid (7) frequency, by means the active power regulator of the generating unit, an active power variation command based on the first parameter, andwherein the process controls active power generated by the distributed power generation plant. 2. Process, according to claim 1, where a relationship between the active power variation command of the generating units (2) and the requirement in total active power variation of the generating plant (1) is calculated, where the first parameter is defined as said relationship, and where the first parameter is Ci. 3. Process, according to claim 1, where a relationship between the active power variation command of the generating units (2) and the deviation in grid frequency (7) is calculated, where the first parameter is defined as said relationship, and where the first parameter is Ki. 4. Process, according to claim 3, where the first parameter is calculated in accordance with the expression Ki=KT·Ci, where KT is the requirement in total active power variation, Ki is the first parameter, and Ci represents a relationship that between the active power variation parameter of the generating units (2) and the requirement in total active power variation of the generating plant (1). 5. Process, according to claim 2, where the central control unit (5) of the plant (1) modifies the first parameter of the generating units (2) when changes are produced in at least one operating condition of said generating units (2). 6. Process, according to claim 1, where variation in total active power of the generating plant (1) is defined as a percentage of available power of the generating plant (1), where the generating plant (1) is capable of generating a maximum power and where available power is the maximum power that said generating plant (1) can generate at a given time. 7. Process, according to claim 1, where each generating unit (2) calculates an active power static reduction command generated based on a second parameter stored in said generating unit (2), said second parameter being representative of a respective contribution of said generating unit (2) to a static reduction in the requirement in total active power variation of the generating plant, whereupon the central control unit (2) updates the second parameter when changes are produced therein. 8. Process, according to claim 7, where a relationship between the active power static reduction command of a generating unit (2) and the static reduction in the requirement in total active power variation is calculated, and where the second parameter is defined as said relationship. 9. Process, according to claim 7, where the static reduction in the requirement of total active power variation of the generating plant (1) is defined as a percentage of available power, the generating plant (1) is capable of generating a maximum power and where available power is the maximum power that the generating plant (1) can generate at a given time. 10. Process, according to claim 7, where the first parameter is Ci and where the second parameter and the first parameter are identical. 11. Process, according to claim 1, where the generating unit (2) is a wind farm and the generating plant (1) is a group of wind farms. 12. Process, according to claim 1, where the generating units (2) are wind turbines and the generating plant (1) is a wind farm. 13. Process, according to claim 7, where the generating units (2) are wind turbines and the generating plant (1) is a wind farm, and where the second parameter and the first parameter are determined based on wind turbine (2) operating parameters. 14. Process, according to claim 13, where: the wind turbines (2) calculate an amount of estimated power available in each wind turbine (2) based on wind speed, wind turbine (2) rotational speed, generated power and blade pitch angle position measurements and/or blade power capture coefficients, and wherethe wind turbines (2) send the central control unit (5) a signal indicative of the amount of estimated power available in each wind turbine (2). 15. Process, according to claim 14, where the wind turbines (2) calculate updated blade power capture coefficients when both the active power variation command and the active power static reduction command are null. 16. Process, according to claim 12, where a first group of wind turbines (2) of the wind farm communicates an amount of estimated power available in each wind turbine in the first group of wind turbines (2) to the central control unit (5) by performing a series of operations, the operations comprising: sending a command for calculating available power from the control unit (5) to said first group of wind turbines (2) which are functioning in reserve mode;sending updated static reduction coefficient commands from the control unit (5) to wind turbines (2) on the wind farm that are not part of the first group of wind turbines in order to compensate for deviations in total wind farm power output;the first group of wind turbines (2) switches from operation in reserve mode to operation in normal mode for a predetermined period of time in order to obtain an estimate of available power; andeach wind turbine from said first group of wind turbines (2) sends the central control unit (5) a filtered power measurement, corresponding to the estimate of available power in each wind turbine (2) that is part of the first group of wind turbines. 17. A wind turbine (2) comprising: a power generator connectable to a central control unit (5) of a wind farm (1),a power converter connected to the power generator and to a power grid,a means for measuring a power grid frequency, anda control unit, which in turn comprises: a power regulator (3) that calculates an active power variation command in accordance with a deviation between a reference frequency and a measured frequency, characterised in that the power regulator (3) is configurable and wherein configuration is carried out in accordance with a first parameter received from a central control unit (5) of the wind farm (1) indicative of the wind turbine's respective contribution to variation in total wind farm power output, where the first parameter is selected from the group consisting of Ki, Ci, or a combination thereof, andwhere the power regulator sends the active power variation command to the power generator. 18. A wind farm (1) formed by at least two wind turbines (2), according to claim 17, the wind farm comprising a communication network (6) that connects a central control unit (5) of the wind farm (1) to the power regulators (3) of the at least two wind turbines (2), where the communication network is configured to calculate new values of the first parameter indicative of the contribution to variation in total power output from the central control unit (5) and where the communication network sends the new values of the first parameter to the power regulators (3) of said at least two wind turbines (2). 19. Process, according to claim 1, further comprising updating the value of the first parameter when conditions under which the wind turbine operates undergo at least one change.
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이 특허에 인용된 특허 (9)
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