Wind park, method of correcting voltage imbalances, and wind turbine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-009/00
H02P-009/04
출원번호
US-0761864
(2010-04-16)
등록번호
US-8183705
(2012-05-22)
우선권정보
DK-2009 00501 (2009-04-17)
발명자
/ 주소
Bo, Yin
Deng, Heng
Styhm, Ove
Larsen, Kim B.
출원인 / 주소
Vestas Wind Systems A/S
대리인 / 주소
Patterson & Sheridan, LLP
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
A wind park, a method of correcting voltage imbalances, and a wind turbine are provided. The wind park includes at least one wind turbine; a transformer coupled between the at least one wind turbine and a power grid. The transformer includes a primary winding arrangement coupled to the power grid, a
A wind park, a method of correcting voltage imbalances, and a wind turbine are provided. The wind park includes at least one wind turbine; a transformer coupled between the at least one wind turbine and a power grid. The transformer includes a primary winding arrangement coupled to the power grid, and a secondary winding arrangement coupled to the at least one wind turbine. The power grid includes at least three power lines, each power line conducting a respective phase of a multi-phase current. Each power line of the power grid is coupled to the primary winding arrangement via an individual tap changer. Influences of the detected voltage imbalances on the wind turbines can be compensated.
대표청구항▼
1. A wind park, comprising: at least one wind turbine;a transformer coupled between the at least one wind turbine and a power grid, wherein the transformer comprises a primary winding arrangement coupled to the power grid, and a secondary winding arrangement coupled to the at least one wind turbine;
1. A wind park, comprising: at least one wind turbine;a transformer coupled between the at least one wind turbine and a power grid, wherein the transformer comprises a primary winding arrangement coupled to the power grid, and a secondary winding arrangement coupled to the at least one wind turbine;wherein the power grid comprises at least three power lines, each power line conducting a respective phase of a multi-phase current,wherein each power line of the power grid is coupled to the primary winding arrangement via an individual tap changer, andwherein each tap changer is configured to correct at least one of a voltage imbalance and a current imbalance associated with at least one of the power lines by varying a number of turns of the primary winding arrangement that are selected. 2. The wind park of claim 1, wherein the primary winding arrangement comprises at least three windings. 3. The wind park of claim 2, wherein each winding of the primary winding arrangement is coupled to a respective power line of the power grid via an individual tap changer. 4. The wind park of claim 1, wherein each tap changer comprises a plurality of contact points or a continuous contact line being connected to the primary winding arrangement, wherein the primary winding arrangement is connectable to the power lines via the contact points or the contact line. 5. The wind park of claim 4, wherein each tap changer further comprises a sliding contact for selectively contacting one of the plurality of contact points or for sliding along the contact line. 6. The wind park of claim 4, wherein each tap changer further comprises a switch assigned to each contact point, each switch connecting one contact point to the power lines. 7. The wind park of claim 1, wherein the tap changer is one or more of a group consisting of a mechanical tap changer, an electrical tap changer, and an electrical assisted tap changer. 8. The wind park of claim 1, further comprising: a detection unit coupled to the power grid, the detection unit being configured to detect voltage imbalances occurring on the power grid coupled to the primary winding arrangement. 9. The wind park of claim 8, further comprising: a processing unit coupled to the detection unit, the processing unit being configured to calculate respective tap changer adjustments for each tap changer needed in order to compensate influences of the detected voltage imbalances on the wind turbines. 10. The wind park of claim 9, further comprising: a tap changing controlling unit coupled to the processing unit, the tap changing controlling unit being configured to control a tap changer adjustment process based on the calculated tap changer adjustments. 11. The wind park of claim 1, wherein the transformer serves as a centralized transformer for a plurality of wind turbines. 12. The wind park of claim 1, wherein the transformer is implemented within the at least one wind turbine. 13. A method of correcting voltage imbalances occurring on a power grid being coupled to a wind park via a transformer, the power grid comprising at least three power lines and the transformer comprising a primary winding arrangement and at least one tap changer for coupling each power line to the primary winding arrangement, the method comprising: detecting voltage imbalances occurring on the power grid;calculating respective tap changer adjustments for the at least one tap changer of each power line individually needed in order to compensate influences of the detected voltage imbalances on the wind turbines; andadjusting the at least one tap changer of each power line individually, based on the respective calculated tap changer adjustments,wherein adjusting the at least one tap changer of each power line individually based on the respective calculated tap changer adjustments comprises varying a number of turns of the primary winding arrangement that are selected to correct the detected voltage imbalances associated with at least one of the power lines. 14. The method of claim 13, wherein a first set of tap changers is adjusted based on one calculated tap changer adjustment and a second set of tap changers is adjusted based on a further calculated tap changer adjustment. 15. The method of claim 13, wherein the detection of the voltage imbalances comprises: measuring phase voltages at a point between the transformer and the power grid; anddetermining if the phase voltages form a negative voltage sequence or a zero voltage sequence;wherein the at least one tap changer is adjusted if a negative voltage sequence or a zero voltage sequence is detected. 16. The method of claim 13, wherein the adjusting of the at least one tap changer comprises changing or adjusting electrical connections between the power grid and a plurality of contact points or a continuous contact line being connected to the primary winding arrangement of the transformer. 17. The method of claim 16, wherein the changing or adjusting of electrical connections between the power grid and the contact points comprises selectively contacting one of the plurality of contact points. 18. The method of claim 16, wherein the changing or adjusting of electrical connections between the power grid and the contact line comprises moving a sliding contact along the contact line. 19. The method of claim 16, wherein the changing or adjusting of electrical connections between the power grid and the contact points or the contact line comprises opening or closing a switch of each contact point. 20. A wind turbine, comprising: a transformer coupled between the wind turbine and a power grid, wherein the transformer comprises a primary winding arrangement coupled to the power grid, and a secondary winding arrangement coupled to the wind turbine;wherein the power grid comprises at least three power lines, each power line conducting a respective phase of a multi-phase current;wherein each power line of the power grid is coupled to the primary winding arrangement via an individual tap changer, andwherein each tap changer is configured to correct at least one of a voltage imbalance and a current imbalance associated with at least one of the power lines by varying a number of turns of the primary winding arrangement that are selected.
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