CN219697312U - Wind generating set and grid-connected contactor cabinet - Google Patents

Abstract

The utility model discloses a wind generating set and a grid-connected contactor cabinet, and belongs to the field of wind power generation. The wind turbine generator system includes: a generator including a stator and a rotor; the grid-connected contactor cabinet is positioned in the wind generating set and comprises a contactor cabinet and a breaker cabinet which are connected side by side, wherein the input of the contactor cabinet is electrically connected with the stator, the output of the contactor cabinet is electrically connected with the input of the breaker cabinet, the contactor cabinet comprises a contactor, and the breaker cabinet comprises a breaker; the converter is electrically connected with the rotor; the transformer is electrically connected with the converter and is positioned outside the wind generating set or in the engine room of the wind generating set; and the switch device cabinet is positioned outside the wind generating set, the switch device cabinet comprises a breaker, the input of the switch device cabinet is electrically connected with the output of the breaker cabinet and the transformer, and the output of the switch device cabinet is configured to be electrically connected with the grid-connected side bus. According to the embodiment of the utility model, the grid connection requirement of the wind generating set with high voltage level can be met.

Description

Wind generating set and grid-connected contactor cabinet

Technical Field

The utility model belongs to the field of wind power generation, and particularly relates to a wind generating set and a grid-connected contactor cabinet.

Background

With the continuous development of wind power generation technology, the voltage class requirements of wind power generation units are also higher and higher. Under the high voltage level of the wind generating set, such as 35kV, 66kV or higher voltage level, the grid-connected contactor cabinet of the original wind generating set with low voltage level is not suitable for the wind generating set with high voltage level any more, and the grid-connected requirement of the wind generating set with high voltage level cannot be met.

Disclosure of Invention

The embodiment of the utility model provides a wind generating set and a grid-connected contactor cabinet, which can meet the grid-connected requirement of the wind generating set with high voltage level.

In a first aspect, an embodiment of the present utility model provides a wind turbine generator set, including: a generator including a stator and a rotor; the grid-connected contactor cabinet is positioned in the wind generating set and comprises a contactor cabinet and a breaker cabinet which are connected side by side, wherein the input of the contactor cabinet is electrically connected with the stator, the output of the contactor cabinet is electrically connected with the input of the breaker cabinet, the contactor cabinet comprises a contactor, and the breaker cabinet comprises a breaker; the converter is electrically connected with the rotor; the transformer is electrically connected with the converter and is positioned outside the wind generating set or in the engine room of the wind generating set; and the switch device cabinet is positioned outside the wind generating set, the switch device cabinet comprises a breaker, the input of the switch device cabinet is electrically connected with the output of the breaker cabinet and the transformer, and the output of the switch device cabinet is configured to be electrically connected with the grid-connected side bus.

In a second aspect, an embodiment of the present utility model provides a grid-connected contactor cabinet, including a contactor cabinet and a circuit breaker cabinet connected in parallel; wherein the input of the contactor cabinet is configured to be electrically connected with a stator of a generator in the wind power generation set, the contactor cabinet comprising a contactor; the input of the breaker cabinet is electrically connected with the output of the contactor cabinet, the breaker cabinet comprising a breaker.

The embodiment of the utility model provides a wind generating set and a grid-connected contactor cabinet. The grid-connected contactor cabinet comprises a contactor cabinet and a breaker cabinet which are connected side by side, wherein the input of the contactor cabinet is electrically connected with the stator, and the output of the contactor cabinet is electrically connected with the input of the breaker cabinet. The converter is electrically connected with the rotor, the transformer is electrically connected with the converter, the input of the switch device cabinet is electrically connected with the output of the circuit breaker cabinet and the transformer, and the output of the switch device cabinet is configured to be electrically connected with the grid-connected side bus. That is, the stator of the generator is directly and electrically connected with the grid-connected side bus through the grid-connected contactor cabinet and the switch device cabinet, the rotor of the generator is electrically connected with the grid-connected side bus through the converter, the transformer and the switch device cabinet, the grid-connected contactor cabinet is matched with the wind generating set, and the contactor in the grid-connected contactor cabinet matched with the wind generating set can realize grid connection and grid disconnection of the wind generating set, so that the grid connection requirement of the wind generating set with high voltage level is met.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings that are needed to be used in the embodiments of the present utility model will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.

FIG. 1 is a schematic diagram of a wind turbine generator system according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a wind turbine generator system according to another embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a grid-connected contactor cabinet according to an embodiment of the present utility model.

Detailed Description

Features and exemplary embodiments of various aspects of the present utility model will be described in detail below, and in order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the utility model only and not limiting. It will be apparent to one skilled in the art that the present utility model may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the utility model by showing examples of the utility model.

With the continuous development of wind power generation technology, the voltage class requirements of wind power generation units are also higher and higher. Under the high voltage class of the wind generating set, such as the voltage class of 35kV, 66kV or higher, the structure of the wind generating set with the high voltage class is different from that of the wind generating set with the low voltage class, and the grid-connected contactor cabinet of the original wind generating set with the low voltage class is not suitable for the wind generating set with the high voltage class any more, so that the grid-connected requirement of the wind generating set with the high voltage class cannot be met.

The utility model provides a wind generating set and a grid-connected contactor cabinet, which aims at a wind generating set with a high voltage level, wherein the grid-connected contactor cabinet of the wind generating set structure with the high voltage level is arranged in the wind generating set, the grid connection and the grid disconnection of the wind generating set with the high voltage level can be realized through the grid-connected contactor cabinet, the grid-connected requirement of the wind generating set with the high voltage level is met, and the safety protection under the condition of abnormal stator side or fault can be realized through the grid-connected contactor cabinet. Moreover, the switch device cabinet is arranged outside the wind generating set, so that the safety protection of the wind generating set with high voltage level can be realized under the condition of rotor side abnormality or fault through the switch device cabinet, and the safety of the wind generating set with high voltage level is improved.

The wind generating set and the grid-connected contactor cabinet provided by the utility model are respectively described below.

The first aspect of the utility model provides a wind power plant. Fig. 1 is a schematic structural diagram of a wind generating set according to an embodiment of the present utility model, and fig. 2 is a schematic structural diagram of a wind generating set according to another embodiment of the present utility model, where, as shown in fig. 1 and fig. 2, the wind generating set may include a generator 11, a grid-connected contactor cabinet 12, a converter 13, a transformer 14, and a switching device cabinet 15.

The generator 11 includes a stator and a rotor, and in the embodiment of the present utility model, the stator and the rotor output voltages are different, and the stator output voltage is higher than the rotor output voltage, for example, the stator output voltage can reach 35kV and above, and the rotor output voltage is about 690V to 10kV. Because the voltage level output by the stator is higher, the voltage output by the stator does not need to be boosted by the transformer 14, and the voltage output by the rotor still needs to be boosted by the transformer 14.

The grid-connected contactor cabinet 12 is located inside the wind power generator set. The grid-tied contactor cabinet comprises a contactor cabinet 21 and a circuit breaker cabinet 22 connected side by side. The input of the contactor cabinet 21 is electrically connected to the stator, the output of the contactor cabinet 21 is electrically connected to the input of the breaker cabinet 22, and the output of the breaker cabinet 22 is electrically connected to the input of the switching device cabinet 15.

The contactor cabinet 21 comprises contactors 211, which contactors 211 can be used to control grid connection and grid disconnection of a wind turbine. The contactor 211 is conducted, so that the wind generating set is connected with the grid; the contactor 211 is turned off and the wind turbine is off-grid. The mechanical life of the contactor 211 is very high and far longer than the life of a breaker, a disconnecting switch, a load switch and other switching devices, so that the frequent start-stop requirement of the wind generating set can be met, the breaker is not required to be adopted to realize the frequent start-stop requirement of the wind generating set under the normal condition of the wind generating set, the breaker in the grid-connected contactor cabinet 12 is prevented from being frequently opened and closed, and the life of the breaker in the grid-connected contactor cabinet 12 is prolonged. For example, the mechanical life of the contactor is greater than 10 ten thousand times of opening and closing, the mechanical life of the breaker is about 1 ten thousand times of opening and closing, the mechanical life of the isolating switch or the load switch is about 5000 times of opening and closing, if the wind generating set is connected with the grid for one year and the number of times of opening and closing required by off-grid is close to 8000, the sequential breaker needs to be replaced about every 1.2 years, the comprehensive cost is increased, the wind generating set is connected with the grid and disconnected from the grid through the contactor, frequent replacement of the breaker can be avoided, and the comprehensive cost is saved.

Other devices, modules, units or apparatuses may be provided in the contactor cabinet 21 according to the application scenario and requirements, which is not limited herein. In some examples, the contactor cabinet 21 may further include a voltage transformer and a control unit of the contactor. As shown in fig. 1 and 2, the voltage transformer PT1 may be disposed at an end of the contactor 211 electrically connected to the stator, that is, the voltage transformer PT1 is connected to an end of the contactor 111 electrically connected to the stator, and the voltage transformer PT1 may detect phase sequence, phase, frequency and other voltage information of the voltage output from the stator. The parameters of the voltage transformer PT1 may be selected according to the voltage information, which will not be described herein. The voltage transformer PT1 may be connected to the control unit of the contactor 211 to transmit the detected voltage information to the control unit of the contactor 211. The control unit of the contactor 211 is connected to the contactor 211, and the control unit of the contactor 211 can control the on and off of the contactor 211. When the voltage information detected by the voltage transformer PT1 is consistent with the voltage information on the grid-connected side and the grid-connected condition is satisfied, the control unit of the contactor 211 controls the contactor 211 to be turned on, so that grid connection is realized. In some examples, the contactor cabinet 21 may further include a current transformer electrically connected to the contactor 211, the current transformer may collect current information on a line, and a specific setting position of the current transformer may be set according to a requirement for the current information, for example, if current information of a current output by the stator needs to be obtained, the current transformer may be set on a line between the contactor 211 and the stator; if current information of the current flowing through the contactor 211 is to be acquired, a current transformer may be provided on a line between the contactor 211 and the output of the contactor cabinet 21.

The breaker cabinet 22 includes a breaker 221, and the breaker 221 may be used to turn off and intercept a loop in case of an abnormality or a fault on the stator side to secure the safety of the wind generating set. The circuit breaker 221 in the circuit breaker cabinet 22 is electrically connected to the contactor 211 in the contactor cabinet 21. The circuit breaker 221 can switch on, carry, and switch off the current under the normal circuit condition, and can switch on, carry, and switch off the current under the abnormal circuit condition within a predetermined time. In the event of a short circuit, the magnetic field generated by the short circuit current may overcome the reaction spring in the circuit breaker 221 to cause the trip unit pulling operation structure to act, achieving instantaneous tripping of the circuit breaker 221. When overload occurs, the current increases, the corresponding heating value also increases, the bimetallic strip in the circuit breaker 221 deforms, and the corresponding structure can be pushed to act when the bimetallic strip deforms to a certain degree, so that the tripping of the circuit breaker 221 is realized.

The breaker cabinet 22 may also be provided with other devices, modules, units or apparatuses according to the application scenario and requirements, which are not limited herein. In some examples, the circuit breaker cabinet 22 further includes one or both or more of the following: the device comprises an isolating switch, a grounding switch, an electric operating mechanism, an auxiliary switch and a current transformer. The isolating switch, the grounding switch and the current transformer are arranged on a circuit where the circuit breaker is electrically connected with the input of the circuit breaker cabinet 22, as shown in fig. 1 and 2, the isolating switch and the grounding switch can be jointly arranged (namely 222 in fig. 1 and 2), the grounding switch is grounded, one end of the isolating switch is electrically connected with the circuit breaker 221, the other end of the isolating switch is electrically connected with the current transformer CT1, a cable connection accessory 223 can be further arranged between the isolating switch and the current transformer CT1, and the isolating switch and the current transformer CT1 are connected through the cable connection accessory 223. The isolating switch can be used for isolating a power supply, switching operation, connecting and disconnecting a small-current circuit and the like. When the isolating switch is at the off position, an insulation distance meeting the specified requirement and an obvious off mark are arranged between the contacts; when the isolating switch is in the closed position, the isolating switch can bear current under normal loop conditions and current under abnormal conditions within a specified time. The isolating switch can also isolate the part of the high-voltage power distribution device, which needs to be powered off, from the live part, for example, in fig. 1 and 2, when overhauling, the breaker 221 can be isolated from the stator side through the isolating switch to form an obvious disconnection point so as to ensure the overhauling safety. The current transformer CT1 may detect current information of a current transmitted from the stator into the breaker cabinet 22 through the contactor cabinet 21, and may determine whether an abnormality or a fault occurs at the stator side based on the current information, and if the abnormality or the fault occurs at the stator side, the breaker 221 in the breaker cabinet is turned off. The parameters of the current transformer CT1 may be selected according to the current information, which will not be described here. In the first breaker cabinet 22, an electric operating mechanism may be provided to the breaker and/or the disconnector, and the on-off of the breaker and the disconnector may be achieved through the electric operating mechanism. The control voltage of the electric operating mechanism may be 24V, 48V, 110V, 220V, etc., and is not limited herein. The breaker and/or the isolating switch can be provided with a breaking coil and a closing coil, and the breaking and the closing of the breaker and the isolating switch can be realized through the breaking coil and the closing coil. In the first breaker cabinet 22, an auxiliary switch may be provided to at least one of the breaker, the disconnector, and the grounding switch, and the auxiliary switch may indicate an operating state of the breaker, the disconnector, and the grounding switch provided with the auxiliary switch.

In some examples, grid-tie contactor cabinet 11 also includes a cable lift cabinet disposed side-by-side with circuit breaker cabinet 22 and electrically connected to the output of circuit breaker cabinet 22. The input of the cable lifting cabinet may be electrically connected with the output of the breaker cabinet 22 and the output of the cable lifting cabinet may be electrically connected with the input of the switching device cabinet 15. The cable lifting cabinet may be used to connect the output of the breaker cabinet 22 with the input of the switchgear cabinet 15 in order to facilitate wiring between the breaker cabinet 22 and the switchgear cabinet 15. The cable lifting cabinet can be arranged under the condition that a plurality of grid-connected contactor cabinets 11 are needed to be connected in parallel, namely a plurality of wind generating sets are needed to be connected in parallel, so that the grid-connected contactor cabinets 11 can be connected in parallel. Moreover, when faults or anomalies occur, maintenance staff can also carry out maintenance through the cable lifting cabinet, so that the maintenance difficulty is reduced.

The current transformer 13 is electrically connected to the rotor of the generator, and the transformer 14 is electrically connected to the current transformer 13. Specifically, the output of the rotor is electrically connected to the input of the current transformer 13, and the output of the current transformer is electrically connected to the input of the transformer 14. In some examples, the converter 13 may include a rectifier 131 and an inverter 132, with an input of the rectifier 131 electrically connected to the rotor, an output of the rectifier 131 electrically connected to an input of the inverter 132, and an output of the inverter 132 electrically connected to an input of the transformer 14. The transformer 14 may be located outside the wind power plant or within a nacelle of the wind power plant.

The switchgear cabinet 15 may be located outside the wind power plant, e.g. the switchgear cabinet 15 may be located outside the tower of the wind power plant. The input of the switching device cabinet 15 is electrically connected to the output of the breaker cabinet 22 and the transformer 14, and the output of the switching device cabinet 15 is configured to be electrically connected to the grid-connected side bus bar 31.

The switchgear cabinet 15 includes a breaker 241, and the breaker 241 may be used to turn off and intercept a loop in case of an abnormality or a failure at a rotor side to secure the safety of the wind generating set. The circuit breaker 241 can switch on, carry, and switch off the current under normal circuit conditions, and can switch on, carry, and switch off the current under abnormal circuit conditions within a predetermined time. When a short circuit occurs, the magnetic field generated by the short circuit current can overcome the counter-force spring in the circuit breaker 241, so that the trip unit pulls the operation structure to act, and the instantaneous trip of the circuit breaker 241 is realized. When overload occurs, the current increases, the corresponding heating value also increases, the bimetallic strip in the circuit breaker 241 deforms, and the corresponding structure can be pushed to act when the bimetallic strip deforms to a certain degree, so that the tripping of the circuit breaker 241 is realized.

The switch device cabinet 15 may further provide other devices, modules, units or apparatuses according to the application scenario and requirements, which is not limited herein. In some examples, the switchgear cabinet 15 may further include one or both or more of the following: isolation switch, earthing switch, electric operating mechanism, auxiliary switch, current transformer, voltage transformer, electric quantity meter. The disconnector, the earthing switch, the voltage transformer may be arranged in the switchgear cabinet 15 on a line where the circuit breaker 241 is electrically connected to the input of the switchgear cabinet 15. In the switchgear cabinet 15, the grounding switch is grounded, and the function of the disconnector can be referred to the description about the disconnector in the circuit breaker cabinet 12. During maintenance, the breaker 241 can be isolated from the rotor side, namely the transformer 14, through the isolating switch, so that an obvious disconnection point is formed, and the maintenance safety is ensured. The voltage transformer may detect the voltage information of the voltage on the grid-connected side bus bar 31 to compare with the voltage information of the voltage output from the stator detected by the voltage transformer PT1 in the grid-connected contactor cabinet 12, and determine whether to perform grid-connection. The parameters of the voltage transformer can be selected according to the voltage information, and are not described here. A current transformer, an electrical meter may be provided in the switchgear cabinet 15 on a line where the circuit breaker 241 is electrically connected to the output of the switchgear cabinet 15. The current transformer may detect current information of a current on which the current transformer is located, and may determine whether an abnormality or a fault occurs based on the current information, and if the abnormality or the fault occurs, the circuit breaker 241 is turned off. The parameters of the current transformer can be selected according to the current information, and are not described here. The electric quantity meter can meter the electric quantity output by the wind generating set. In the switchgear cabinet 15, an electric operating mechanism is provided to the circuit breaker and/or the disconnector, and the circuit breaker and the disconnector can be turned on and off by the electric operating mechanism. The breaker and/or the isolating switch can be provided with a breaking coil and a closing coil, and the breaking and the closing of the breaker and the isolating switch can be realized through the breaking coil and the closing coil. In the switch device cabinet 15, auxiliary switches are provided in at least one of the breaker, the disconnecting switch, and the grounding switch, and the auxiliary switches may indicate the operating states of the breaker, the disconnecting switch, and the grounding switch provided with the auxiliary switches.

The voltage of the electric energy output from the stator of the generator 11 in the wind turbine generator is sufficient to be directly electrically connected to the grid-connected bus bar 31 through the grid-connected contactor cabinet 12 and the switching device cabinet 15. No boost is required between the stator and the grid-connected side bus 31, i.e., the electrical energy output by the stator does not need to pass through the transformer 14. The voltage of the electric energy output by the rotor is lower than that of the electric energy output by the stator, the electric energy output by the rotor needs to be converted by the converter 13 and boosted by the transformer 14 before being transmitted to the grid-connected bus 31 through the switching device cabinet 15, namely, the rotor is electrically connected with the grid-connected bus 31 through the converter 13, the transformer 14 and the switching device cabinet 15.

In the embodiment of the utility model, the wind generating set comprises a generator 11, a grid-connected contactor cabinet 12, a converter 13, a transformer 14 and a switch device cabinet 15. The grid-connected contactor cabinet 12 includes a contactor cabinet 21 and a breaker cabinet 22 that are connected side by side, an input of the contactor cabinet 21 is electrically connected to the stator, and an output of the contactor cabinet 21 is electrically connected to an input of the breaker cabinet 22. The current transformer 13 is electrically connected to the rotor, the transformer 14 is electrically connected to the current transformer 13, the input of the switching device cabinet 15 is electrically connected to the output of the circuit breaker cabinet 22 and the transformer 14, and the output of the switching device cabinet 15 is configured to be electrically connected to the grid-connected side bus bar 31. That is, the stator of the generator 11 is directly electrically connected to the grid-connected bus 31 through the grid-connected contactor cabinet 12 and the switch device cabinet 15, the rotor of the generator 11 is electrically connected to the grid-connected bus 31 through the converter 13, the transformer 14 and the switch device cabinet 15, the grid-connected contactor cabinet 12 is adapted to the wind turbine generator set, and the contactor 211 in the grid-connected contactor cabinet 12 adapted to the wind turbine generator set can realize grid connection and grid disconnection of the wind turbine generator set, so as to meet the grid connection requirement of the wind turbine generator set with high voltage level. Moreover, the circuit breaker 221 in the grid-connected contactor cabinet 12 and the circuit breaker 241 in the switching device cabinet 15 can be turned off in case of abnormality or failure, and the safety of the high-voltage wind generating set can be improved.

In some embodiments, as shown in fig. 1 and 2, the switchgear cabinet 15 may include a line-in sub-cabinet 23 and a circuit breaker sub-cabinet 24 that are connected. The inputs of the switching device cabinet 15 may include a first input of the incoming line cabinet 23 and a second input of the incoming line cabinet 23. The first input of the incoming line sub-cabinet 23 is electrically connected to the output of the grid-tie contactor cabinet 12, the second input of the incoming line sub-cabinet 23 is electrically connected to the output of the transformer 14, and the output of the incoming line sub-cabinet 23 is electrically connected to the input of the circuit breaker sub-cabinet 24. The output of the breaker sub-cabinet 24 is configured to be electrically connected to the grid-tied side bus bar 31.

The incoming line cabinet 23 may be used to connect the grid-tie contactor cabinet 12 with the circuit breaker cabinet 24 and to connect the transformer 14 with the circuit breaker cabinet 24. The incoming line cabinet 23 may also detect current information of the current flowing into the incoming line cabinet 23. For example, as shown in fig. 1 and 2, the incoming line cabinet 23 may include a current transformer CT2 and a current transformer CT3; the current transformer CT2 is electrically connected with the output of the grid-connected contactor cabinet 12, can detect the current information of the current output by the grid-connected contactor cabinet 12, and when the current information of the current output by the grid-connected contactor cabinet 12 represents faults or anomalies, the circuit breaker 241 in the switching device cabinet 15 can be turned off; the current transformer CT3 is electrically connected to the output of the transformer 14, and can detect the current information of the current output by the transformer 14, and when the current information of the current output by the transformer 14 indicates a fault or abnormality, the breaker 241 in the switchgear 15 can be turned off. The current transformer CT2 may be electrically connected to the output of the wire inlet cabinet 23 through the cable connection attachment 231, and the current transformer CT3 may be electrically connected to the output of the wire inlet cabinet 23 through the cable connection attachment 232.

The circuit breaker 241 of the switch gear cabinet 15 may be disposed in the circuit breaker sub-cabinet 24, and details of the circuit breaker 241 may be referred to in the description of the foregoing embodiments, which are not repeated herein. Other devices, modules, units or equipment may be provided in the breaker cabinet 24 according to the application scenario and requirements, and are not limited herein. In some examples, one or more of the following may also be included in the circuit breaker sub-cabinet 24: isolation switch, earthing switch, electric operating mechanism, auxiliary switch, current transformer, voltage transformer, electric quantity meter. As shown in fig. 1 and 2, a disconnector and a grounding switch may be provided in combination (i.e., 242 in fig. 1 and 2), the grounding switch being grounded, one end of the disconnector being electrically connected to an input of the circuit breaker sub-cabinet 24, and the other end of the disconnector being electrically connected to the circuit breaker 241. The current transformer CT4 may be disposed on a line between the circuit breaker 241 and the output of the circuit breaker sub-cabinet 24, the current transformer CT4 may detect the current of the grid-connected side bus 31, and when the current information of the current of the grid-connected side bus 31 indicates that a fault or abnormality occurs, the circuit breaker 241 in the circuit breaker sub-cabinet 24 may be turned off. The current transformer CT4 may be electrically connected to the circuit breaker 241 through a cable connection accessory 243. The voltage transformer PT2 may be electrically connected to an input of the breaker sub-cabinet 24. In the breaker sub-cabinet 24, an electric operating mechanism can be arranged on the breaker 241 and/or the isolating switch, and the on-off of the breaker 241 and the isolating switch can be realized through the electric operating mechanism; the breaker 241 and/or the isolating switch may be provided with a switching-off coil and a switching-on coil, so that the breaker 241 and the isolating switch can be switched on and off respectively. In the breaker sub-cabinet 24, an auxiliary switch may be provided to at least one of the breaker 241, the isolating switch, and the grounding switch, and the auxiliary switch may indicate an operation state of the breaker 241, the isolating switch, and the grounding switch provided with the auxiliary switch.

The transformer 14 in the wind generating set has flexible layout and can be arranged in a cabin of the wind generating set or outside the wind generating set.

In some examples, grid-tie contactor cabinet 12 may be located within a nacelle of a wind turbine generator system with transformer 14 located within the nacelle. As shown in fig. 1, the transformer 14 and the grid-tie contactor cabinet 12 are both disposed within a nacelle 41 of the wind turbine.

In other examples, where transformer 14 is located external to the wind turbine, grid-tie contactor cabinet 12 may be located within a tower of the wind turbine, e.g., grid-tie contactor cabinet 12 may be provided on a tower door platform for ease of operation and maintenance of grid-tie contactor cabinet 12. As shown in fig. 2, the outside of the tower of the wind power generation set is provided with a box-type transformer 42, and the box-type transformer 42 may include the transformer 14 and the switching device cabinet 15 in the above embodiment, i.e., the transformer 14 and the switching device cabinet 15 may be integrated in the box-type transformer 42 outside the tower.

The contactor cabinet 21 in the above embodiment has a first accommodation chamber in which the contactor 211, the voltage transformer PT1, and the like are located. The circuit breaker cabinet 22 has a second accommodating cavity in which the circuit breaker 221, the disconnecting switch and grounding switch 222, the current transformer CT1, the cable connection accessory 223, and the like are located.

The wind generating set has a limited internal space, for example, the diameter of the tower of the land wind generating set is 4 to 5 meters, the diameter of the tower of the offshore wind generating set is about 6 to 8 meters, and in order to easily arrange the grid-connected contactor cabinet 12 inside the wind generating set, insulating gas can be filled in the first accommodating cavity of the contactor cabinet 21 and the second accommodating cavity of the breaker cabinet 22, so that the insulation gap between devices is reduced, and the volume of the grid-connected contactor cabinet 12 is reduced. The insulating gas may comprise a gas having high voltage insulating properties, e.g. the insulating gas may comprise SF ₆ A gas or other insulating gas.

In some examples, the first receiving cavity may be in communication with the second receiving cavity, i.e., the first receiving cavity and the second receiving cavity may form one large receiving cavity in the grid-tie contactor cabinet 12. The grid-connected contactor cabinet 12 can be realized as a stainless steel air chamber, and a large accommodating cavity formed by the first accommodating cavity and the second accommodating cavity can be cubic or can-shaped, and can be specifically determined according to application scenes and requirements.

In other examples, the first receiving chamber and the second receiving chamber may be separated by a separation plate. If a spacer is provided between the first accommodation chamber and the second accommodation chamber, it may be provided at a broken line between the contactor cabinet 21 and the circuit breaker cabinet 22 in fig. 1 and 2. The first accommodating cavity and the second accommodating cavity can be cube-shaped or tank-shaped, and can be specifically determined according to application scenes and requirements.

Because the output voltage of the stator of the wind generating set can reach 10kV and above, in order to break through the voltage level of the contactor, the contactor is matched with the stator of the wind generating set, the contactor can comprise a vacuum contactor, the voltage level of the vacuum contactor is higher than that of a common contactor, and the vacuum contactor can be matched with the stator of the wind generating set.

In some examples, the vacuum contactor may include an insulated electrical isolation frame, a metal base, a drive crank arm, an electromagnetic system, and a vacuum switch tube. The insulating electricity isolating frame is positioned on the metal base, the vacuum switch tube is arranged on the insulating electricity isolating frame, a cavity is arranged in the metal base, and the transmission crank arm and the electromagnetic system are positioned in the cavity. Under the condition that an electromagnetic coil in an electromagnetic system is electrified, an armature iron drives a transmission crank arm to rotate, so that a main contact in a vacuum switch tube is connected, namely a vacuum contactor is connected; under the condition that an electromagnetic coil in an electromagnetic system is powered off, a brake separating spring acts to separate a main contact in a vacuum switch tube, namely a vacuum contactor is turned off. The vacuum switch tube comprises a first end sealing cover, a second end sealing cover, a metal corrugated tube and a ceramic tube. The ceramic tube is a shell of the vacuum switch tube, can be made of insulating ceramic materials, for example, can be made of 95 ceramic insulating materials, can increase the creepage distance, mechanical strength, heat resistance and shock resistance of the vacuum switch tube, and further improves the voltage level which can be born by the vacuum contactor.

The second aspect of the utility model provides a grid-connected contactor cabinet. Fig. 3 is a schematic structural diagram of a grid-connected contactor cabinet according to an embodiment of the present utility model, as shown in fig. 3, where the grid-connected contactor cabinet is the grid-connected contactor cabinet 12 in the foregoing embodiment, and details of the grid-connected contactor cabinet may be referred to the related descriptions in the foregoing embodiment and will not be described herein.

The grid-connected contactor cabinet 12 in the embodiment of the utility model can be matched with the stator and the rotor of the generator, so that grid connection, grid disconnection and safety protection of the wind generating set are realized, the grid connection requirement of the wind generating set with high voltage level is met, and the safety of the wind generating set with high voltage level can be improved.

It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. For grid-tie contactor cabinet embodiments, reference may be made to the description of wind turbine generator set embodiments. The utility model is not limited to the specific constructions described above and shown in the drawings. Various changes, modifications and additions may be made by those skilled in the art after appreciating the spirit of the present utility model. Also, a detailed description of known techniques is omitted herein for the sake of brevity.

Those skilled in the art will appreciate that the above-described embodiments are exemplary and not limiting. The different technical features presented in the different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in view of the drawings, the description, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the word "a" does not exclude a plurality; the terms "first," "second," and the like, are used for designating a name and not for indicating any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The presence of certain features in different dependent claims does not imply that these features cannot be combined to advantage.

Claims (17)

1. A wind turbine generator set, comprising:

a generator comprising a stator and a rotor;

the grid-connected contactor cabinet is positioned inside the wind generating set and comprises a contactor cabinet and a breaker cabinet which are connected side by side, wherein the input of the contactor cabinet is electrically connected with the stator, the output of the contactor cabinet is electrically connected with the input of the breaker cabinet, the contactor cabinet comprises a contactor, and the breaker cabinet comprises a breaker;

the converter is electrically connected with the rotor;

the transformer is electrically connected with the converter and is positioned outside the wind generating set or in the cabin of the wind generating set;

the switch device cabinet is positioned outside the wind generating set, the switch device cabinet comprises a breaker, the input of the switch device cabinet is electrically connected with the output of the breaker cabinet and the transformer, and the output of the switch device cabinet is configured to be electrically connected with the grid-connected side bus.

2. A wind turbine generator set according to claim 1, wherein the wind turbine generator set comprises,

the grid-connected contactor cabinet is positioned in the cabin of the wind generating set under the condition that the transformer is positioned in the cabin of the wind generating set;

or alternatively, the process may be performed,

and under the condition that the transformer is positioned outside the wind generating set, the grid-connected contactor cabinet is positioned in a tower barrel of the wind generating set.

3. The wind generating set of claim 1, wherein a box-type transformer is arranged outside a tower of the wind generating set, and the box-type transformer comprises the transformer and the switch device cabinet.

4. A wind power unit according to any of claims 1-3, wherein the contactor cabinet has a first accommodation chamber, the breaker cabinet has a second accommodation chamber, both the first accommodation chamber and the second accommodation chamber being filled with an insulating gas;

the first accommodating cavity is communicated with the second accommodating cavity, or the first accommodating cavity is isolated from the second accommodating cavity by an isolating plate.

5. A wind power unit according to any one of claims 1 to 3, wherein the grid-tie contactor cabinet further comprises a cable lifting cabinet arranged side by side with the circuit breaker cabinet and electrically connected to the output of the circuit breaker cabinet.

6. A wind power generation set according to any one of claims 1 to 3, wherein the contactor cabinet further comprises a voltage transformer and a control unit of the contactor, the voltage transformer being provided at one end of the contactor electrically connected to the stator, the control unit of the contactor being connected to the contactor;

the contactor cabinet further comprises a current transformer, and the current transformer is electrically connected with the contactor.

7. A wind power unit according to any of claims 1-3, wherein the contactor comprises a vacuum contactor.

8. The wind turbine of claim 7, wherein the vacuum contactor comprises an insulated electrical isolation frame, a metal base, a transmission crank arm, an electromagnetic system and a vacuum switch tube, wherein the insulated electrical isolation frame is positioned on the metal base, the vacuum switch tube is arranged on the insulated electrical isolation frame, a cavity is formed in the metal base, the transmission crank arm and the electromagnetic system are positioned in the cavity,

the vacuum switch tube comprises a first end sealing cover, a second end sealing cover, a metal corrugated tube and a ceramic tube.

9. The wind power generation set of claim 1, wherein the circuit breaker cabinet further comprises one or more of: an isolating switch, a grounding switch, an electric operating mechanism, an auxiliary switch and a current transformer,

the circuit breaker comprises a circuit breaker cabinet, a circuit breaker, an electric operating mechanism, an auxiliary switch, a circuit breaker, a grounding switch and a current transformer, wherein the circuit breaker, the grounding switch and the current transformer are arranged on a circuit where the circuit breaker cabinet interrupts the circuit breaker and the input of the circuit breaker cabinet is electrically connected, the electric operating mechanism is arranged on the circuit breaker and/or the disconnecting switch in the circuit breaker cabinet, and the auxiliary switch is arranged on at least one of the circuit breaker, the disconnecting switch and the grounding switch in the circuit breaker cabinet.

10. The wind generating set according to claim 1, wherein the switchgear cabinet comprises a wire inlet sub-cabinet and a circuit breaker sub-cabinet which are connected;

the first input of the wire inlet sub-cabinet is electrically connected with the output of the grid-connected contactor cabinet, the second input of the wire inlet sub-cabinet is electrically connected with the output of the transformer, the output of the wire inlet sub-cabinet is electrically connected with the input of the circuit breaker sub-cabinet, the output of the circuit breaker sub-cabinet is configured to be electrically connected with a grid-connected side bus, and the circuit breaker sub-cabinet comprises a circuit breaker.

11. The grid-connected contactor cabinet is characterized by comprising a contactor cabinet and a breaker cabinet which are connected side by side;

wherein an input of the contactor cabinet is configured to be electrically connected with a stator of a generator in a wind turbine generator set, the contactor cabinet comprising a contactor;

the input of the breaker cabinet is electrically connected with the output of the contactor cabinet, and the breaker cabinet comprises a breaker.

12. The grid-tie contactor cabinet of claim 11, wherein said grid-tie contactor cabinet is located within a nacelle or tower of said wind turbine.

13. The grid-tie contactor cabinet according to claim 11, wherein the contactor cabinet has a first receiving cavity, the circuit breaker cabinet has a second receiving cavity, both the first receiving cavity and the second receiving cavity being filled with an insulating gas;

the first accommodating cavity is communicated with the second accommodating cavity, or the first accommodating cavity is isolated from the second accommodating cavity by an isolating plate.

14. The grid tie contactor cabinet according to any one of claims 11 to 13, further comprising a cable lifting cabinet disposed side-by-side with the circuit breaker cabinet and electrically connected to an output of the circuit breaker cabinet.

15. The grid-tie contactor cabinet according to any of claims 11 to 13,

the contactor cabinet further comprises a voltage transformer and a control unit of the contactor, wherein the voltage transformer is arranged at one end of the contactor, which is electrically connected with the stator, and the control unit of the contactor is connected with the contactor;

the contactor cabinet further comprises a current transformer, and the current transformer is electrically connected with the contactor.

16. The grid tie contactor cabinet according to any one of claims 11 to 13, wherein the contactors comprise vacuum contactors.

17. The grid-tie contactor cabinet according to claim 11, wherein the circuit breaker cabinet further comprises one or more of: an isolating switch, a grounding switch, an electric operating mechanism, an auxiliary switch and a current transformer,

the circuit breaker comprises a circuit breaker cabinet, a circuit breaker, an electric operating mechanism, an auxiliary switch, a circuit breaker, a grounding switch and a current transformer, wherein the circuit breaker, the grounding switch and the current transformer are arranged on a circuit where the circuit breaker cabinet interrupts the circuit breaker and the input of the circuit breaker cabinet is electrically connected, the electric operating mechanism is arranged on the circuit breaker and/or the disconnecting switch in the circuit breaker cabinet, and the auxiliary switch is arranged on at least one of the circuit breaker, the disconnecting switch and the grounding switch in the circuit breaker cabinet.