CN215633512U

CN215633512U - Wind generating set

Info

Publication number: CN215633512U
Application number: CN202120908090.XU
Authority: CN
Inventors: 倪青荣; 俞庆; 刘琳; 阮庆洲; 赵一秋
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2022-01-25
Anticipated expiration: 2031-04-28

Abstract

The application provides a wind generating set, including cabin, transformer, at least three converter and connecting device. The nacelle includes a rack deck that divides the nacelle into an upper region and a lower region. The transformer is arranged in the lower area of the rack platform plate. The at least three converters are arranged in the upper area of the rack platform plate, and the output ends of the at least three converters are electrically connected with the input end of the transformer; the at least three converters comprise a first converter, a second converter and a third converter, the first converter and the second converter are located on two sides of the middle of the cabin, and the third converter is located at the tail of the cabin. The connecting device is electrically connected between the output ends of the at least three converters and the input end of the transformer. At least three converters are arranged in the cabin and electrically connected with the transformer, and the unit capacity of the wind generating set is improved by increasing the number of the converters, so that the requirement of large capacity of the wind generating set is met, and the high voltage of the generating side of the wind generating set is ensured.

Description

Wind generating set

Technical Field

The application relates to the technical field of wind power generation, in particular to a wind generating set.

Background

With the development of wind power generation technology, wind generating sets are developed to have larger capacity and higher voltage. With the increase of the unit capacity of the wind generating set, the number of the current transformers configured at present is limited, the unit capacity is greatly limited, the requirement of the large capacity of the wind generating set cannot be met, and the high voltage of the generating side of the wind generating set cannot be ensured.

SUMMERY OF THE UTILITY MODEL

The application provides a wind generating set for improving the capacity of the set.

The embodiment of the application provides a wind generating set, includes:

a nacelle including a rack deck that divides the nacelle into an upper region and a lower region;

a transformer disposed in the lower region of the rack deck;

the at least three converters are arranged in the upper area of the rack platform plate, and the output ends of the at least three converters are electrically connected with the input end of the transformer; the at least three converters comprise a first converter, a second converter and a third converter, the first converter and the second converter are positioned on two sides of the middle part of the cabin, and the third converter is positioned at the tail part of the cabin; and

and the connecting device is electrically connected between the output ends of the at least three converters and the input end of the transformer.

Optionally, the connecting device includes at least three sets of flexible connecting members, which are respectively and correspondingly electrically connected to the output end of the converter.

Optionally, the flexible connector includes a three-phase flexible copper bar and a ground copper bar, the three-phase flexible copper bar is electrically connected to the three-phase output terminal of the converter, and the ground copper bar is electrically connected to the ground terminal of the converter.

Optionally, the two adjacent soft copper bars are arranged in an insulating manner.

Optionally, the three-phase soft copper bars electrically connected to the first converter are arranged at intervals along the length direction of the nacelle.

Optionally, the three-phase soft copper bars electrically connected to the second converter are arranged at intervals along the length direction of the nacelle.

Optionally, the three-phase soft copper bars electrically connected to the third converter are arranged at intervals along the width direction of the nacelle.

Optionally, the connecting device further includes at least three sets of adapters, each adapter includes a hard adapter and a flexible adapter, the hard adapter is respectively and correspondingly electrically connected with the first converter and the second converter through the soft connector, and the flexible adapter is electrically connected with the third converter through the soft connector.

Optionally, the connection device further includes at least three groups of outgoing line sleeves and a neutral point sleeve, one end of the outgoing line sleeve is electrically connected to the output end of the converter through the adaptor and the flexible connector, the other end of the outgoing line sleeve is electrically connected to the input end of the transformer, and the neutral point of the transformer is electrically connected to the neutral point sleeve.

Optionally, the flexible adapter includes a three-phase cable, one end of the three-phase cable is correspondingly electrically connected to the third converter through the flexible connector, and the other end of the three-phase cable is electrically connected to the transformer through the outgoing line sleeve.

Optionally, the connecting device further comprises a pressure connector, and the cable of each phase of the three-phase cable is electrically connected with the outlet sleeve through the pressure connector.

Optionally, each phase of the three-phase cable includes a plurality of wires, and the plurality of wires are insulated from each other.

Optionally, the cables of two adjacent phases are insulated from each other.

Optionally, the hard adaptor includes a first hard adaptor and a second hard adaptor electrically connected to the first hard adaptor, the first hard adaptor is electrically connected to the first converter and the second converter respectively through the soft connector, and the first hard adaptor is electrically connected to the outlet sleeve through the second hard adaptor.

Optionally, the first rigid adapter includes a first straight copper bar.

Optionally, the second rigid adapter includes a second straight copper bar and a bent copper bar, and the second straight copper bar is close to the wire outlet sleeve for the bent copper bar.

Optionally, the two adjacent first hard adapters are insulated from each other.

Optionally, the two adjacent second hard adapters are insulated from each other.

Optionally, the connecting device further includes a plurality of fixing members, and the soft connecting member and the adaptor, and the adaptor and the outgoing line sleeve are fixed by the fixing members.

Optionally, the surface of the flexible connector is wrapped with an insulating layer.

Optionally, an insulating guardrail is arranged on the outer side of the rigid adaptor, and a gap is formed between the insulating guardrail and the rigid adaptor.

According to the technical scheme provided by the embodiment of the application, at least three converters are arranged in the cabin and are electrically connected with the transformer, and the unit capacity of the wind generating set is improved by increasing the number of the converters, so that the requirement of large capacity of the wind generating set is met, and the high voltage of the generating side of the wind generating set is ensured.

Drawings

FIG. 1 illustrates a schematic structural view of an embodiment of a wind turbine of the present application;

FIG. 2 is a schematic illustration in partial cross-sectional view of a nacelle of the wind turbine shown in FIG. 1;

FIG. 3 illustrates a schematic top view of a portion of a nacelle of the wind turbine shown in FIG. 1;

FIG. 4 is a circuit diagram of a converter and transformer of the wind turbine shown in FIG. 1;

FIG. 5 is a schematic block diagram of a converter and a transformer of the wind turbine shown in FIG. 1;

fig. 6 is a schematic view illustrating a structure of a connection device of the wind power generator shown in fig. 1.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this application do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" includes two, and is equivalent to at least two. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

As shown in fig. 1, the wind turbine 10 includes a tower 11, a nacelle 12 mounted on the tower 11, and a wind rotor 13 assembled to the nacelle 12. Wind rotor 13 includes a rotatable hub (not shown) and at least one blade (not shown) connected to and extending outwardly from the hub. In the embodiment shown in FIG. 1, the rotor 13 includes a plurality of blades, three of which are shown in FIG. 1 for illustration. A plurality of blades may be spaced about the hub to facilitate rotating the rotor 13 to enable wind energy to be converted into usable mechanical energy, and subsequently, electrical energy.

In some embodiments, a motor (not shown) is provided within nacelle 12, which may be connected to rotor 13 for generating electrical power from the mechanical energy generated by rotor 13. In some embodiments, a control device (not shown) is also disposed within the nacelle 12, the control device being communicatively connected to electrical components of the wind turbine 10 in order to control the operation of such components. In some embodiments, the control device may also be disposed within any other component of the wind park 10, or at a location external to the wind park 10. In some embodiments, the control device may comprise a computer or other processing unit. In some other embodiments, the control device may comprise suitable computer readable instructions that, when executed, configure the control device to perform various functions, such as receiving, transmitting and/or executing control signals of the wind park 10. In some embodiments, the control device may be configured to control various operating modes (e.g., start-up or shut-down sequences) of the wind park 10 and/or to control various components of the wind park 10.

In some embodiments, the control device may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, and so on. The control device may be a microprocessor or the control device may be any conventional processor or the like, which is not described in detail herein.

As shown in fig. 2-5, the nacelle 12 includes a frame deck 121, the frame deck 121 dividing the nacelle into an upper region 122 and a lower region 123. The wind park 10 further comprises a transformer 14, at least three converters 15 and a connecting device 16. Wherein the transformer 14 is disposed in the lower region 123 (as shown in fig. 2) of the rack platform board 121, the at least three converters 15 are disposed in the upper region 122 (as shown in fig. 3) of the rack platform board 121, the output terminals of the at least three converters 15 are electrically connected to the input terminals of the transformer 14, the connecting device 16 is electrically connected between the output terminals of the at least three converters 15 and the input terminals of the transformer 14 (as shown in fig. 2 and 6), and the connecting device 16 is electrically connected to electrically connect the converters 15 and the transformer 14. In some embodiments, three current transformers 15 may be provided. In other embodiments, the number of the current transformers 15 may be more than three. In the present embodiment, three current transformers 15 are provided, but not limited thereto. In some embodiments, the at least three converters 15 include a first converter 151, a second converter 152, and a third converter 153, the first and

second converters

151 and 152 being located on either side of the middle of the nacelle 12, and the third converter 153 being located at the rear of the nacelle 12 (as shown in fig. 3). Wherein, located in the middle of the nacelle 12, it is shown that in the length direction a of the nacelle 12, with respect to the tail of the nacelle 12, it is located close to the middle of the nacelle 12. The positions on both sides of the nacelle 12 are shown in the width direction B of the nacelle 12, which is disposed close to the left and right side walls of the nacelle 12 with respect to the middle of the nacelle 12, as can be seen in fig. 3.

In the embodiment shown in fig. 2, the second current transformer 152 and the third current transformer 153 are shown in the upper region 122 of the nacelle 12 and the transformer is located in the lower region 123 of the nacelle 12, without the first current transformer 151. Fig. 2 mainly shows the position relationship between the transformer 14 and the current transformer 15 (e.g., the second current transformer 152, the third current transformer 153), and the specific circuit connection and implementation process thereof can be seen in fig. 4 and 5. Also, the connection device 16 in fig. 2 only shows the electrical connection relationship between the current transformer 15 (e.g., the second current transformer 152) and the transformer 14, and the specific structure thereof can be seen in fig. 6.

In the embodiment shown in fig. 3, a first current transformer 151 is shown arranged on the left side wall of the nacelle 12, a second current transformer 152 is shown arranged on the right side wall of the nacelle 12, the first and second

current transformers

151 and 152 are mainly shown arranged on both sides of the middle part of the nacelle 12, and a third current transformer 153 is arranged at the tail part of the nacelle 12.

In the above embodiment, on one hand, the number of the converters 15 is increased to increase the unit capacity of the wind turbine generator system 10, so as to meet the requirement of the large capacity of the wind turbine generator system 10 and ensure the high voltage on the power generation side of the wind turbine generator system 10. On the other hand, the transformer 14 and the inverter 15 are respectively provided in the upper region 122 and the lower region 123 of the nacelle 12, so that the low-voltage connection between the inverter 15 and the transformer 14 is facilitated, the electrical connection is facilitated and secured, and the size of the nacelle 12 in the longitudinal direction a can be reduced by the vertical arrangement. In another aspect, the at least three converters 15 are electrically connected to the transformer 14 by the connecting device 16, so that the electrical connection is stable and reliable.

Fig. 2 and 3 are schematic diagrams showing only the structure of the transformer 14, the first converter 151, the second converter 152, the third converter 153, and the connection device 16 in the nacelle 12, showing the electrical connection relationship and the positional arrangement relationship among the above components, and other components arranged in the nacelle 12 are not shown.

As shown in fig. 4, the first, second, and third

current transformers

151, 152, and 153 are located at an upper region of the rack deck 121, and the transformer 14 is located at a lower region of the rack deck 121. In the embodiment shown in fig. 4, the first converter 151 includes three-phase output terminals U10, V10, W10 and a ground terminal PE10, and the three-phase output terminals U10, V10, W10 are electrically connected to the first set of input terminals U11, V11, W11 of the transformer 14. The second converter 152 includes three-phase output terminals U20, V20, W20 and a ground terminal PE20, and the three-phase output terminals U20, V20, W20 are electrically connected to the second set of input terminals U21, V21, W21 of the transformer 14. The third converter 153 includes three-phase output terminals U30, V30, W30 and a ground terminal PE30, and the three-phase output terminals U30, V30, W30 are electrically connected to the third set of input terminals U31, V31, W31 of the transformer 14. In the embodiment shown in fig. 4, the transformer 14 also includes a neutral point P40.

In the embodiment shown in fig. 4, the transformer 14 comprises a first loop junction 141, a second loop junction 142 and a third loop junction 143. A first phase input U11 of the first set of inputs, a first phase input U21 of the second set of inputs, a first phase input U31 of the third set of inputs of the transformer 14 are electrically connected to the first loop junction 141. A second phase input V11 of the first set of inputs, a second phase input V21 of the second set of inputs, a second phase input V31 of the third set of inputs of the transformer 14 are connected to the second loop junction 142. A third phase input W11 of the first set of inputs, a third phase input W21 of the second set of inputs, a third phase input W31 of the third set of inputs of the transformer 14 are connected to the third circuit junction 143. In some embodiments, the first loop junction 141, the second loop junction 142, and the third loop junction 143 may not be connected therebetween. In some embodiments, the interiors of the converters 15 (e.g., including the first converter 151, the second converter 152, and the third converter 153) may be controlled by a software program, so as to ensure that the phases of the three-phase outputs of the respective converters 15 are consistent. Therefore, at least three converters 15 are arranged in the nacelle 12, the at least three converters 15 can be operated simultaneously, and under the condition that any one group or any two groups of converters 15 have faults, the other group of converters 15 can be operated independently through a software control program, so that the availability of the unit is improved.

As shown in fig. 5, the input terminals of the first converter 151, the second converter 152 and the third converter 153 are electrically connected to the output terminal of the generator 17, the output terminals of the first converter 151, the second converter 152 and the third converter 153 are electrically connected to the input terminal of the transformer 14, and the output terminal of the transformer 14 can be electrically connected to the booster station 19 through the medium voltage switchgear 18. Wherein the input of the transformer 14 may be a low voltage side and the output of the transformer 14 may be a high voltage side. The medium voltage switchgear 18 functions to control the high voltage with the low voltage in real time, so as to protect and monitor the high voltage side. The booster station 19 may be a land booster station or an offshore booster station, and is not limited in this application.

In the embodiment shown in fig. 5, the first converter 151 includes a machine side reactor 1511, a power conversion module 1512, a main reactor 1513, a filter 1514, and a switch control module 1515, which are electrically connected in sequence. The machine side reactor 1511 may be an inductor, and plays a role in frequency modulation. The power conversion module 1512 may be a rectifier and an inverter, and due to the ac power output by the generator 17, the power conversion module 1512 may convert the ac power output by the generator 17 into dc power, and then convert the dc power into output power to be output to the transformer 14. The main reactor 1513 may be an inductor, which plays a role in frequency modulation. The filter 1514 is electrically connected between the main reactor 1513 and the switch control module 1515 for filtering. The switch control module 1515 may include a main breaker, a precharge switch, for controlling connection and disconnection of the first converter 151. In this arrangement, the energy is received from the output terminal of the generator 17 through the machine-side reactor 1511, frequency-modulated, voltage-regulated, filtered and output to the low-voltage side of the transformer 14, the voltage of the low-voltage side is usually 690V or 1140V or 3000V or more, and the high-voltage side of the transformer 14 is electrically connected to the booster station 19 through the medium-voltage switch cabinet 18.

It should be noted that in the present embodiment, the internal structure and the electrical connection relationship of the second current transformer 152 and the third current transformer 153 are similar to those of the first current transformer 151, and the specific implementation process and the implementation principle thereof are similar, so the internal structure and the electrical connection relationship of the second current transformer 152 and the third current transformer 153 can refer to the internal structure and the electrical connection relationship of the first current transformer 151. By increasing the number of the converters 15, the unit capacity of the wind generating set 10 can be increased, so that the requirement of large capacity of the wind generating set 10 is met, the high voltage of the generating side of the wind generating set 10 is ensured, and the generating side can be one side of the output end of the wind generating set 10.

Referring to fig. 2 and 6, the connecting device 16 includes at least three sets of soft connectors 161, at least three sets of adapters 162, at least three sets of outlet bushings 163, a neutral bushing 164, and a plurality of fasteners 165, and the soft connectors 161 and the adapters 162, and the adapters 162 and the outlet bushings 163 are fixed by the fasteners 165. In some embodiments, the fasteners 165 may be bolts, latches, retaining pins, or the like. In some embodiments, the flexible connector 161 may be fixed to the output end of the converter 15 by a fixing member 165, and the outlet sleeve 163 may be fixed to the input end of the transformer 14 by the fixing member 165, which is not limited in this application.

In some embodiments, at least three sets of flexible connectors 161 are electrically connected to the output terminals of the converter 15. In some embodiments, the at least three sets of soft connections 161 include a first set of soft connections 1611, a second set of soft connections 1612, and a third set of soft connections 1613. The first group of soft connectors 1611 is electrically connected to the output end of the first converter 151 correspondingly, the second group of soft connectors 1612 is electrically connected to the output end of the second converter 152 correspondingly, and the third group of soft connectors 1613 is electrically connected to the output end of the third converter 153 correspondingly.

In some embodiments, the flexible connector 161 includes three-phase flexible copper bars electrically connected to the three-phase output terminals of the converter 15, and a grounding copper bar electrically connected to the grounding terminal of the converter 15. In some embodiments, the first set of soft connectors 1611 includes a first set of three-phase

soft copper bars

1611a, 1611b, 1611c and a first set of ground copper bars 1611d, the second set of soft connectors 1612 includes a second set of three-phase

soft copper bars

1612a, 1612b, 1612c and a second set of ground copper bars 1612d, and the third set of soft connectors 1613 includes a third set of three-phase

soft copper bars

1613a, 1613b, 1613c and a third set of ground copper bars 1613 d.

As shown in fig. 4 and fig. 6, the first three-phase

soft copper bars

1611a, 1611b, and 1611c may be electrically connected to the three-phase output terminals U10, V10, and W10 of the first converter 151, and the first ground copper bar 1611d may be electrically connected to the ground terminal PE10 of the first converter 151. The second group of three-phase

soft copper bars

1612a, 1612b, 1612c may be electrically connected to the three-phase output terminals U20, V20, W20 of the second converter 152, and the second group of grounding copper bars 1612d may be electrically connected to the grounding terminal PE20 of the second converter 152. The third three-phase soft

copper bar group

1613a, 1613b, 1613c may be electrically connected to the three-phase output terminals U30, V30, W30 of the third converter 153, and the third ground copper bar group 1613d may be electrically connected to the ground terminal PE30 of the third converter 153, which is not limited in this application.

In some embodiments, the three-phase soft copper bars electrically connected to the first converter 151 are arranged at intervals along the length direction a of the nacelle 12. As shown in fig. 3, 4 and 6, the first set of three-phase

soft copper bars

1611a, 1611b and 1611c electrically connected to the three-phase output terminals U10, V10 and W10 of the first converter 151 are spaced along the length direction a of the nacelle 12. With such an arrangement, on the one hand, the installation space of the nacelle 12 in the length direction a can be effectively utilized, and the size of the nacelle 12 in the width dimension B can be reduced; on the other hand, one side of each of the first three-phase

soft copper bars

1611a, 1611b and 1611c is close to the side wall of the cabin 12, and a distance exists between adjacent soft copper bars, so that an electrical gap is satisfied, electrical connection is safer and more reliable, and assembly and maintenance are facilitated, wherein the electrical gap represents the shortest spatial distance measured between two conductive parts or between a conductive part and an equipment protection interface, and the electrical gap is satisfied, so that stable performance and safety of an electrical assembly can be guaranteed.

In some embodiments, the three-phase soft copper bars electrically connected to the second converter 152 are spaced along the length a of the nacelle 12. As shown in fig. 3, 4 and 6, the second set of three-phase

soft copper bars

1612a, 1612b and 1612c electrically connected to the three-phase output ends U20, V20 and W20 of the second converter 152 are arranged at intervals along the length direction a of the nacelle 12. With such an arrangement, on the one hand, the installation space of the nacelle 12 in the length direction a can be effectively utilized, and the size of the nacelle 12 in the width dimension B can be reduced; on the other hand, make one side of second group three-phase

soft copper bar

1612a, 1612b, 1612c all be close to the lateral wall of cabin 12, have the distance between the adjacent soft copper bar, satisfy the electrical clearance, make electrical connection more safe and reliable, and be convenient for assemble and maintain.

In some embodiments, the three-phase soft copper bars electrically connected to the third converter 153 are arranged at intervals along the width direction B of the nacelle 12. As shown in fig. 3, 4 and 6, the third three-phase soft

copper bar group

1613a, 1613B and 1613c electrically connected to the three-phase output terminals U30, V30 and W30 of the third converter 153 are spaced apart from each other in the width direction B of the nacelle 12. The third three-phase

soft copper bars

1613a, 1613B and 1613c are arranged close to the tail of the nacelle 12 relative to the first three-phase

soft copper bars

1611a, 1611B and 1611c and the second three-phase

soft copper bars

1612a, 1612B and 1612c, and when the space at the tail of the nacelle 12 is effectively utilized, the third three-phase

soft copper bars

1613a, 1613B and 1613c are arranged at intervals along the width direction B of the nacelle 12, so that the size of the nacelle 12 in the length direction a can be reduced. In some embodiments, the distance between adjacent soft copper bars satisfies the electrical clearance, makes the electrical connection safer and more reliable, and facilitates assembly and maintenance.

In some embodiments, the surface of the flexible connector 161 is coated with an insulating layer 1614. The insulating layer 1614 may be polycarbonate to protect against the risk of electrical shock. In some embodiments, the two adjacent soft copper bars are arranged in an insulating manner, so that electric shock can be prevented, and the safety of the circuit is ensured. It should be noted that the electrical gap needs to be considered between the two adjacent soft copper bars, and the electrical gap can be controlled according to the requirements of the related electrical design standard, which is not described herein again.

In the above embodiment, since the transformer 14 and the converter 15 in the nacelle 12 are both in a vibration environment, the converter 15 is electrically connected by the soft connection member 161, so that on one hand, the vibration can be prevented from causing the looseness between the output end of the converter 15 and the input end of the transformer 14; on the other hand, considering that installation tolerance and manufacturing error of the whole nacelle 12 may cause difficulty in installation, the soft connector 161 can be used to well compensate for the error, and reliability of the unit can be improved.

In some embodiments, the adaptor 162 includes a hard adaptor 1621 and a flexible adaptor 1622, the hard adaptor 1621 is electrically connected to the first converter 151 and the second converter 152 respectively through the soft connector 161, and the flexible adaptor 1622 is electrically connected to the third converter 153 through the soft connector 161. In some embodiments, the hard adaptor 1621 is electrically connected to the output of the first converter 151 via a first set of soft connectors 1611, and the hard adaptor 1621 is electrically connected to the output of the second converter 152 via a second set of soft connectors 1612, and the flexible adaptor 1622 is electrically connected to the output of the third converter 153 via a third set of soft connectors 1613.

In some embodiments, one end of the outlet sleeve 163 is electrically connected to the output end of the converter 15 through the adaptor 162 and the flexible connector 161, the other end of the outlet sleeve 163 is electrically connected to the input end of the transformer 14, the neutral point of the transformer 14 is electrically connected to the neutral sleeve 164, and the neutral point of the transformer 14 is electrically connected to the ground. In some embodiments, outlet ferrules 163 include a first set of

outlet ferrules

1631a, 1631b, 1631c, a second set of

outlet ferrules

1632a, 1632b, 1632c, and a third set of

outlet ferrules

1633a, 1633b, 1633 c.

As shown in fig. 4 and 6, one end of each of the first

outgoing line bushings

1631a, 1631b and 1631c is electrically connected to the three-phase output terminals U10, V10 and W10 of the first converter 151 through the hard adaptor 1621 and the first soft connector 1611, and the other end of each of the first

outgoing line bushings

1631a, 1631b and 1631c is electrically connected to the first input terminals U11, V11 and W11 of the transformer 14. One end of the second group of outlet bushings 1632 is electrically connected to the three-phase output terminals U20, V20, W20 of the second converter 152 through the hard adaptor 1621 and the second soft connector 1612, and the other end of the second group of outlet bushings 1632 is electrically connected to the second group of input terminals U21, V21, W21 of the transformer 14. One end of the third group of outlet bushings 1633 is electrically connected to the three-phase output terminals U30, V30, W30 of the third converter 153 through the flexible adaptor 1622 and the third group of flexible connector 1613, and the other end of the third group of outlet bushings 1633 is electrically connected to the third group of input terminals U31, V31, W31 of the transformer 14. The neutral bushing 164 of the transformer 14 is electrically connected to the neutral PE40 of the transformer 14.

In the above embodiment, since the current transformer 15 is disposed in the upper region of the nacelle 12 and is spaced apart from the transformer 14 in the height direction (as shown in fig. 2), and the output end of the current transformer 15 is connected to the flexible connectors 161, since the transformer 14 and the current transformer 15 in the nacelle 12 are both in a vibration environment and vibration easily occurs between the flexible connectors 161, the first current transformer 151 is electrically connected to the transformer 14 by electrically connecting the first group of flexible connectors 1611 and the first group of

outlet sockets

1631a, 1631b and 1631c through the rigid adapters 1621, and the second group of flexible connectors 1612 is electrically connected to the second group of outlet sockets 1632 through the rigid adapters 1621, so that the second current transformer 152 is electrically connected to the transformer 14, and the rigid adapters 1621 each play a supporting role to ensure that the two adjacent flexible connectors in the first group of flexible connectors 1611 and the two adjacent flexible connectors in the second group of flexible connectors 1612 have a distance, the electric clearance is satisfied, and the stable performance and the safety of the electric assembly are ensured.

In the above embodiment, since the third converter 153 is located at the rear of the nacelle 12 and has a distance from the transformer 14 in the height direction and the length direction (as shown in fig. 2), if the output end of the third converter 153 and the input end of the transformer 14 are electrically connected by the rigid adaptor 1621, the installation is difficult, and the safety of the electrical connection cannot be ensured. Therefore, the third set of flexible connectors 1613 and the third set of outlet sleeves 1633 are electrically connected through the flexible adapter 1622, so that the third converter 153 is electrically connected to the transformer 14, and thus, the electrical connection is safer and more reliable. And, the third converter 153 is located at the tail of the nacelle 12, and the space at the tail of the nacelle 12 is larger than the space in the middle of the nacelle 12, so that the assembly difficulty is small, and the installation and maintenance are convenient.

In the above embodiment, the outlet sleeve 163 is disposed on the cover of the transformer 14, and is electrically connected to the low-voltage side of the transformer 14 through the outlet sleeve 163, and the inside of the outlet sleeve 163 can form electrical and magnetic connection with the iron core through a lead or a coil, so that the lead inside the outlet sleeve 163 can be ensured to be in the same phase with the low-voltage side of the transformer 14, and the electrical connection is ensured to be stable and reliable.

Compared with the related art, in the above embodiment, the soft connector 161, the hard adaptor 1621, the soft adaptor 1622, and the outgoing line sleeve 163 are used in combination, so as to realize the electrical connection between the at least three converters 15 and the transformer 14, reduce the number of cables between the converters 15 and the transformer 14, reduce the cost, and avoid the failure risk of cable twisting.

In some embodiments, the flexible adapter 1622 includes a three-phase cable, one end of which is electrically connected to the third converter 153 via the flexible connector 161, and the other end of which is electrically connected to the transformer 14 via the outlet sleeve 163. In some embodiments, the flexible interposer 1622 includes three-

phase cables

1622a, 1622b, 1622 c. As shown in fig. 4 and fig. 6, one end of each of the three-

phase cables

1622a, 1622b, and 1622c is electrically connected to the three-phase output terminals U30, V30, and W30 of the third converter 15 through the third three-phase

soft copper bars

1613a, 1613b, and 1613 c. The other ends of the three-

phase cables

1622a, 1622b, 1622c are electrically connected to the third set of input terminals U31, V31, W31 of the transformer 14 through third set of

outlet bushings

1633a, 1633b, 1633 c.

In some embodiments, adjacent two-phase cables are insulated from each other. In the embodiment shown in fig. 6, insulation is provided between

cables

1622a and 1622b, and between

cables

1622b and 1622 c. So set up, avoid mutual interference between the adjacent cable on the one hand, on the other hand can prevent to electrocute, guarantees circuit safety. In some embodiments, each phase of the three-phase cable includes a plurality of conductors insulated from each other. So set up, avoid interfering mutually between the adjacent wire on the one hand, on the other hand can guarantee electrical connection safe and reliable. It should be noted that the number of the plurality of wires may be selected according to the magnitude of the unit current of the wind turbine generator system 10, and is not described herein again. In some embodiments, the connection device 16 further includes a compression fitting (not shown) by which each phase of the three-phase cable is electrically connected to the outlet sleeve 163. By electrically connecting the cable to the outlet sleeve 163 using a compression fitting, safety and reliability are achieved.

It should be noted that, for the low voltage side of the transformer 14, there are different voltage classes, such as 690V, 1140V or 3000V and above, when the cable connection is selected, the voltage class needs to be selected according to the unit voltage of the wind turbine generator system 10, and the outside of the cable may be protected by a cable trough, but is not limited thereto and will not be described herein again.

In some embodiments, the hard adaptor 1621 includes a first hard adaptor 1623 and a second hard adaptor 1624 electrically connected to the first hard adaptor 1623, the first hard adaptor 1623 is electrically connected to the first converter 151 and the second converter 152 through the soft connector 161, and the first hard adaptor 1623 is electrically connected to the outlet sleeve 163 through the second hard adaptor 1624. In some embodiments, the hard adapter 1621 includes a first set of hard adapters and a second set of hard adapters, each of which includes a first hard adapter 1623 and a second hard adapter 1624 electrically connected to the first hard adapter 1623. In the embodiment shown in fig. 6, the first hard adapter 1623 and the second hard adapter 1624 of the first set of hard adapters are disposed on the left side wall of the nacelle 12, and the first hard adapter 1623 and the second hard adapter 1624 of the second set of hard adapters are disposed on the right side wall of the nacelle 12, but not limited thereto.

As shown in fig. 4 and fig. 6, the first hard adapter 1623 of the first hard adapter is electrically connected to the three-phase output terminals U10, V10, and W10 of the first converter 151 through the first

soft connectors

1611a, 16311b, and 1611c, and the second hard adapter 1624 of the first hard adapter is electrically connected to the first input terminals U11, V11, and W11 of the transformer 14 through the first

outgoing cables

1631a, 1631b, and 1631 c. The first hard adapter 1623 of the second set of hard adapters is electrically connected to the three-phase output terminals U20, V20, W20 of the second converter 152 correspondingly through the second set of

soft connectors

1612a, 1612b, 1612c, and the second hard adapter 1624 of the second set of hard adapters is electrically connected to the second set of input terminals U12, V12, W12 of the transformer 14 correspondingly through the second set of

outgoing line bushings

1632a, 1632b, 1632 c.

In some embodiments, the first rigid adaptor 1623 includes a first straight copper bar. In the embodiment shown in fig. 6, the first straight copper bar functions as a current carrying and connecting soft connector 161 and the second hard adapter 1624 in the circuit. In some embodiments, the first straight copper bar extends along the height direction of the nacelle 12 for electrically connecting the soft connector 1611 and the second hard adapter 1624. The first hard adapter piece 1623 comprises a three-phase first straight copper bar which can be represented by 1623a, 1623b and 1623c, the three-phase first

straight copper bar

1623a, 1623b and 1623c are respectively and correspondingly electrically connected with the first group of soft connecting

pieces

1611a, 1611b and 1611c, and the three-phase first

straight copper bar

1623a, 1623b and 1623c play a supporting role to ensure that an electric gap is reserved among the first group of soft connecting

pieces

1611a, 1611b and 1611c, so that the first hard adapter piece is safe and reliable.

In some embodiments, the two adjacent first hard adapters 1623 are insulated from each other. In the embodiment shown in fig. 6, the first

hard adapters

1623a and 1623b are arranged in an insulating manner, and the first

hard adapters

1623b and 1623c are arranged in an insulating manner, so that the mutual interference between the adjacent first hard adapters 1623 is avoided, an electric shock is prevented, and the safety is improved. The distance is reserved between the two adjacent first hard adapters 1623, so that an electrical gap is met, and the stable performance and the safety of the first hard adapters 1623 are guaranteed.

In some embodiments, the second rigid adaptor 1624 includes a second straight copper bar and a bent copper bar, and the second straight copper bar is disposed close to the wire outlet sleeve 163 relative to the bent copper bar. In the embodiment shown in fig. 6, the second straight copper bar functions in the circuit to carry current and connect the first hard adapter 1623 to the outlet sleeve 163. In some embodiments, a second straight copper bar extends along the height of the nacelle 12 for electrically connecting the second rigid adapter 1624 to the outlet sleeve 163. The bent copper bar can be an L-shaped bent copper bar. Because the first hard adaptor 1623 of three-phase sets up along the length direction interval of cabin 12, the wire sleeve 163 sets up along the width direction interval of cabin 12, for guaranteeing that the lead wire or the coil position of the inside of wire sleeve 163 and the low pressure side butt joint of transformer 14, set up as the copper bar of buckling one looks or two-phase hard adaptor 1624 of keeping away from wire sleeve 163 among the hard adaptor 1624 of three-phase second for the electric connection of being convenient for.

In the embodiment shown in fig. 6, the second rigid adapter 1624 of the first set of rigid adapters includes two second straight copper bars and one bent copper bar, the two second straight copper bars are denoted by 1624a and 1624b, the one bent copper bar is denoted by 1624c, the two second straight copper bars may be electrically connected to the first set of input terminals U11 and V11 of the transformer 14, and the one bent copper bar 1624c may be electrically connected to the first set of input terminals W11 of the transformer 14. The second hard adapter 1624 of the second set of hard adapters includes two second straight copper bars and one bent copper bar, the two second straight copper bars are denoted by 1624a and 1624b, the one bent copper bar is denoted by 1624c, the two second

straight copper bars

1624a and 1624b may be electrically connected to the second set of input terminals U21 and V21 of the transformer 14, and the one bent copper bar 1624c may be electrically connected to the second set of input terminals W21 of the transformer 14. In the embodiment shown in fig. 6, the third group of

outlet bushings

1633a, 1633b, 1633c and the three-

phase cables

1622a, 1622b, 1622c are all arranged along the width direction of the nacelle 12 at intervals, and may be electrically connected correspondingly through the second straight copper bar 1624d, so that the bent copper bar is not required to be arranged, and the electrical connection may be realized. In the embodiment shown in fig. 6, the second hard adapter 1624 further includes a second straight copper bar 1624f electrically connected to the neutral sleeve 164.

In some embodiments, an insulation guardrail (not shown) is disposed outside the rigid adaptor 162, and the insulation guardrail and the rigid adaptor 162 have a gap. Through set up insulating guardrail in hard adaptor 162's periphery, can prevent to electrocute, guarantee to maintain safety, and have the distance between the hard adaptor 1624 of adjacent double-phase second, satisfy the electric clearance, guarantee that electric assembly stable performance, safety.

In some embodiments, the soft copper bar is made of copper. In some embodiments, the size of the soft copper bars may be 150mm by 35 mm. The soft copper row can be a woven tape or a thin copper foil, and both ends of the soft copper row can be tinned and perforated so as to be connected with the transformer 14 and the current transformer 15. In some embodiments, the first straight copper bar, the second straight copper bar and the bent copper bar are all made of copper. In some embodiments, the first straight copper bars may be 140mm by 20mm in size.

It should be noted that, the above dimensions are only described in the embodiments, and the sizes and specifications of the soft copper bar, the first straight copper bar, the second straight copper bar, and the bent copper bar can be selected according to the unit current of the wind turbine generator system, which is not described herein again.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A wind turbine generator set, comprising:

a transformer disposed in the lower region of the rack deck;

2. The wind turbine generator system of claim 1, wherein the connection means comprises at least three sets of flexible connectors electrically connected to the output terminals of the converter respectively.

3. The wind generating set according to claim 2, wherein the flexible connecting member comprises three-phase flexible copper bars and a grounding copper bar, the three-phase flexible copper bars are respectively and correspondingly electrically connected with the three-phase output ends of the converter, and the grounding copper bar is electrically connected with the grounding end of the converter.

4. The wind generating set according to claim 3, wherein the two adjacent soft copper bars are insulated from each other; and/or

The three-phase soft copper bars electrically connected with the first converter are arranged at intervals along the length direction of the engine room; and/or

The three-phase soft copper bars electrically connected with the second converter are arranged at intervals along the length direction of the cabin; and/or

And the three-phase soft copper bars electrically connected with the third converter are arranged at intervals along the width direction of the cabin.

5. The wind generating set according to claim 2, wherein the connecting device further comprises at least three sets of adapters, each adapter comprises a rigid adapter and a flexible adapter, the rigid adapters are respectively and correspondingly electrically connected with the first converter and the second converter through the flexible connectors, and the flexible adapters are electrically connected with the third converter through the flexible connectors.

6. The wind generating set according to claim 5, wherein the connecting device further comprises at least three groups of outgoing line bushings and a neutral point bushing, one end of each outgoing line bushing is electrically connected to the output end of the converter through the adaptor and the flexible connector, the other end of each outgoing line bushing is electrically connected to the input end of the transformer, and the neutral point of the transformer is electrically connected to the neutral point bushing.

7. The wind generating set according to claim 6, wherein the flexible adapter comprises a three-phase cable, one end of the three-phase cable is electrically connected with the third converter correspondingly through the flexible connector, and the other end of the three-phase cable is electrically connected with the transformer through the outgoing line sleeve.

8. The wind generating set of claim 7, wherein the connection device further comprises a compression fitting through which each of the three phase cables is electrically connected to the outlet sleeve.

9. The wind power generation assembly of claim 7, wherein each of the three-phase cables includes a plurality of conductors insulated from each other; and/or

The adjacent two phases of the cables are insulated from each other.

10. The wind generating set according to claim 6, wherein the rigid adapter comprises a first rigid adapter and a second rigid adapter electrically connected to the first rigid adapter, the first rigid adapter is electrically connected to the first converter and the second converter through the soft connector, and the first rigid adapter is electrically connected to the outlet bushing through the second rigid adapter.

11. The wind generating set of claim 10, wherein the first rigid adapter comprises a first straight copper bar; and/or

The second rigid adapter comprises a second straight copper bar and a bent copper bar, and the second straight copper bar is arranged close to the wire outlet sleeve relative to the bent copper bar; and/or

The two adjacent first hard adapter pieces are mutually insulated; and/or

The two adjacent second hard adapter pieces are mutually insulated.

12. The wind generating set according to claim 6, wherein the connecting device further comprises a plurality of fixing members, and the soft connecting member and the adaptor member and the outlet sleeve are fixed by the fixing members; and/or

The surface of the soft connecting piece is wrapped with an insulating layer; and/or

And an insulating guardrail is arranged on the outer side of the rigid adaptor, and a gap is formed between the insulating guardrail and the rigid adaptor.