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DE-202025106803-U1 - Wind turbine and wind turbine grid throttle

DE202025106803U1DE 202025106803 U1DE202025106803 U1DE 202025106803U1DE-202025106803-U1

Abstract

Wind turbine (100), with a gondola (104) in which an inverter (300) and a line choke (400) are provided, which are coupled to an output of the inverter (300), wherein the mains choke (400) comprises three choke coils (410) and a yoke (430), wherein the yoke (430) comprises a yoke lower part (431) and a yoke upper part (432), wherein each choke coil (410) has a first and second end face (410a, 410b) and a core package (411) with a first core package end (411a) and a second core package end (411b) in between, wherein each choke coil (410) has a first, second, third and fourth water cooling unit (440, 441 - 444). wherein the first water cooling unit (443) has a first and second straight end (443a, 443b) and is arranged between the first core package end (411a) and a busbar (420), wherein the second water cooling unit (444) has a first straight end (444a) and a second rounded or curved end (444b) which serves as a winding contact surface, wherein a first winding section (412a) is located between the busbar (412) and the second water cooling unit (444), wherein a first straight end (444a) of the second water cooling unit (444) is located at the first winding section (412a), wherein a second winding section (412b) is wound around the second rounded or curved end (444b) of the second water cooling unit (444) such that the windings (412) of the second winding section (412b) are completely in contact with the winding contact surface of the second water cooling unit (444), wherein the third water cooling unit (441) has a first straight end (441a) and a second rounded or curved end (441b) which serves as a winding contact surface, wherein the first end (441a) rests against the second core package end (411b) and is designed to be straight, wherein a third winding section (412c) is wound around the second rounded or curved end (441b) of the third water cooling unit (441) such that windings of the third winding contact section (412c) are completely in contact with the winding contact surface, wherein the fourth water cooling unit (442) has a first and second end (442a, 442b), wherein the first end (442a) is straight and is connected to the third winding section (412c), wherein the second end (442b) of the fourth water cooling unit (442) is rounded or curved and represents a winding contact surface, wherein a fourth winding section (412d) is wound around the second end (442b) of the fourth water cooling unit (442b) so that the windings of the fourth winding section (412d) are completely in contact with the winding contact surface of the second end (442b) of the fourth water cooling unit (442).

Assignees

  • WOBBEN PROPERTIES GMBH

Dates

Publication Date
20260513
Application Date
20250328
Priority Date
20250328

Claims (4)

  1. Wind turbine (100), comprising a nacelle (104) in which an inverter (300) and a line choke (400) are provided, which are coupled to an output of the inverter (300), the line choke (400) comprising three choke coils (410) and a yoke (430), the yoke (430) comprising a yoke lower part (431) and a yoke upper part (432), each choke coil (410) comprising a first and second end face (410a, 410b) and a core pack (411) with a first core pack end (411a) and a second core pack end (411b) between them, each choke coil (410) comprising a first, second, third, and fourth water cooling unit (440, 441-444). wherein the first water cooling unit (443) has a first and second straight end (443a, 443b) and is arranged between the first core package end (411a) and a busbar (420), in which the second water cooling unit (444) has a first straight end (444a) and a second rounded or curved end (444b), which serves as a winding contact surface, In which a first winding section (412a) is located between the busbar (412) and the second water cooling unit (444), wherein a first straight end (444a) of the second water cooling unit (444) is located at the first winding section (412a), In which a second winding section (412b) is wound around the second rounded or curved end (444b) of the second water cooling unit (444), such that the windings (412) of the second winding section (412b) completely abut the winding contact surface of the second water cooling unit (444), whereby the third water cooling unit (441) has a first straight end (441a) and a second rounded or curved end (441b), which serves as a winding contact surface, wherein the first end (441a) abuts the second core package end (411b) and is straight, whereby a third winding section (412c) is wound around the second rounded or curved end (441b) of the third water cooling unit (441), such that windings of the third winding contact section (412c) completely abut the winding contact surface, whereby the fourth water cooling unit (442) has a first and second end (442a, 442b), wherein the first end (442a) is straight and abuts the third winding section (412c) is located, whereby the second end (442b) of the fourth water cooling unit (442) is rounded or curved and represents a winding contact surface, whereby a fourth winding section (412d) is wound around the second end (442b) of the fourth water cooling unit (442b) so that the windings of the fourth winding section (412d) are completely located on the winding contact surface of the second end (442b) of the fourth water cooling unit (442).
  2. Wind turbine (100) after Claim 1 , wherein the water cooling units (440, 441 - 444) each have two water guide sections (441c) which are suitable for receiving a cooling medium of the water cooling.
  3. Wind turbine (100) after one of the Claims 1 until 2 , wherein the rounded or curved second end (444b) of the second, third and/or fourth water cooling unit (444, 441, 442) has a radius of curvature of 8 - 12 mm or several curvature sections with a radius of curvature of 8 - 15 mm and 40 - 60 mm.
  4. A line choke (400) comprising three choke coils (410) and a yoke (430), the yoke (430) having a yoke lower part (431) and a yoke upper part (432), each choke coil (410) having a first and second end face (410a, 410b) and a core pack (411) with a first core pack end (411a) and a second core pack end (411b) between them, each choke coil (410) having a first, second, third and fourth water cooling unit (440, 441-444), the first water cooling unit (443) having a first and second straight end (443a, 443b) and being arranged between the first core pack end (411a) and a busbar (420), the second water cooling unit (444) having a first straight end (444a) and a second rounded or a curved end (444b) which serves as a winding contact surface, wherein a first winding section (412a) is located between the busbar (412) and the second water cooling unit (444), wherein a first straight end (444a) of the second water cooling unit (444) is located at the first winding section (412a), wherein a second winding section (412b) is wound around the second rounded or curved end (444b) of the second water cooling unit (444) so that the windings (412) of the second winding section (412b) are completely in contact with the winding contact surface of the second water cooling unit (444), wherein the third water cooling unit (441) has a first straight end (441a) and a second rounded or curved end (441b) which serves as a winding contact surface, wherein the first end (441a) is located at the second core pack end (411b) is located and is straight, with a third winding section (412c) around the The second rounded or curved end (441b) of the third water cooling unit (441) is wound such that windings of the third winding contact section (412c) are completely in contact with the winding contact surface, the fourth water cooling unit (442) having a first and second end (442a, 442b), the first end (442a) being straight and in contact with the third winding section (412c), the second end (442b) of the fourth water cooling unit (442) being rounded or curved and forming a winding contact surface, a fourth winding section (412d) being wound around the second end (442b) of the fourth water cooling unit (442b) such that the windings of the fourth winding section (412d) are completely in contact with the winding contact surface of the second end (442b) of the fourth water cooling unit. (442) concerns.

Description

The present invention relates to a wind turbine and a wind turbine grid choke. DE 10 2016 122 435 A1 shows a wind turbine with a synchronous generator, an inverter and a grid choke. A grid choke plays a central role in a wind turbine, acting as a filter and protection element between the turbine's inverter and the public power grid. Its primary function is to improve power quality and ensure optimal feed-in of the generated energy into the grid. It achieves this by reducing harmonics caused by the inverter through the smoothing of high-frequency current components. This guarantees higher power quality and compliance with grid connection guidelines. At the same time, the grid choke protects the sensitive electronic components of the system from grid disturbances, such as sudden voltage spikes or load fluctuations, and limits inrush currents that can occur when the wind turbine starts up. In this way, it minimizes mechanical and electrical stresses on the components. Furthermore, the grid choke, due to its inductive characteristics, contributes to the stability of the overall system by dampening the interaction between the wind turbine and the power grid and preventing resonance phenomena. The grid choke is typically designed as either an air-core inductor or an iron-core choke. It is designed to meet the requirements of the power grid without impairing the efficiency of the wind turbine. The cooling requirements for a grid-tie reactor in a wind turbine are particularly demanding due to the specific operating conditions and high electrical and thermal loads. A grid-tie reactor must be able to continuously dissipate heat generated by current losses in the windings as well as core losses. This heat generation can lead to critical overheating, especially under high loads such as those encountered during wind turbine operation, if adequate cooling is not provided. The cooling system of a line choke must be capable of maintaining its operating temperature within a safe range under all operating conditions. The cooling system must be designed to operate efficiently under both normal and maximum loads to prevent overheating and resulting material damage. Uniform heat dissipation is particularly important to minimize thermal stresses within the choke components, such as the windings and iron core, and thus extend the choke's service life. Furthermore, the cooling system must be robust and reliable to withstand the specific environmental conditions of a wind turbine. Wind turbines are often located in environments with extreme temperature fluctuations, high humidity, salty sea air, or other corrosive influences. The cooling components must withstand these external conditions without any loss of performance. This requires the use of corrosion-resistant materials and a design that prevents the ingress of dust, moisture, or other contaminants. Another requirement is the energy efficiency of the cooling system. Since the overall performance of a wind turbine is affected by any internal energy consumption, the cooling system of the grid-tie reactor should operate as energy-efficiently as possible. This can be achieved through passive cooling methods such as natural convection or through the use of energy-efficient active cooling systems, for example, fans or liquid cooling. Additionally, the noise generated by the cooling system plays a role. Particularly with active cooling systems such as fans, measures must be taken to minimize the noise level so that the strict noise protection regulations for wind turbines can be met. Furthermore, the cooling requirements for a grid choke in a wind turbine are particularly demanding when the choke is installed in the nacelle. In this position, in addition to general requirements such as heat dissipation, resistance to environmental influences, and energy efficiency, it faces specific challenges arising from the unique conditions within the nacelle. Space is often limited inside the gondola, making the design and integration of an effective cooling system difficult. The cooling system must therefore be compact and integrate seamlessly into the existing gondola infrastructure without obstructing access to other critical components or impeding airflow inside the gondola. The ambient temperature inside the nacelle can be significantly increased by the waste heat from other system components, such as the generator or inverter. This places additional demands on the thermal capacity and efficiency of the cooling system. An active cooling system, for example with forced ventilation, may be necessary in such cases to maintain operating temperatures within a safe range. It is essential to ensure that the cooling system can reliably handle the additional heat dissipation even under extreme ambient temperatures and high loads. Since the nacelle is continuously subjected to strong vibrations and mechanical stresses during the operation of the wind turbine, the cooling system must be mechanically r