Wind power generation system

Abstract

The utility model relates to a wind power generation system comprising a ring main unit which comprises a first circuit breaker and a first contactor, the first end of the first circuit breaker is connected with a current collection line, and the second end of the first circuit breaker is connected with the first end of the first contactor; the box-type substation comprises a first transformer and a second transformer, a primary winding of the first transformer is connected with the second end of the first contactor, and a primary winding of the second transformer is connected with the first end of the first contactor; the wind generating set comprises a wind driven generator, a second contactor and a second circuit breaker; wherein under the condition that the wind generating set is in a non-power-generation state, the first contactor and the second contactor are disconnected, the first transformer quits operation, and the second transformer is put into operation, so that a working power supply is provided for the wind generating set. By the adoption of the wind power generation system, the box transformer substation can exit from operation in the state that the wind generating set does not generate power, and system loss is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a wind power generation system. Background Art

[0002] In the current wind power generation system, each wind turbine is equipped with a box-type substation (referred to as box-type transformer). The high-voltage side of the box-type transformer is connected to the power grid, and the low-voltage side of the box-type transformer is connected to the wind turbine. The working mode of the wind turbine is intermittent. Only when the wind speed in the wind field meets the requirements can the wind turbine be connected to the grid for power generation. For example, the wind turbine in a certain area of ​​a company is in the power generation state for about 4360 hours a year, and in the non-power generation state for about 4400 hours. Even when the wind turbine is not in the power generation state, the box-type transformer still needs to be operated with power. The long-term operation of the box-type transformer with power will increase the loss of the entire wind power generation system. Utility Model Content

[0003] Based on this, it is necessary to provide a wind power generation system that can reduce losses.

[0004] The present application provides a wind power generation system, comprising:

[0005] The ring main unit comprises a first circuit breaker and a first contactor, wherein a first end of the first circuit breaker is connected to a collector line, and a second end of the first circuit breaker is connected to a first end of the first contactor;

[0006] A box-type substation, comprising a first transformer and a second transformer, wherein the primary winding of the first transformer is connected to the second end of the first contactor, and the primary winding of the second transformer is connected to the first end of the first circuit breaker;

[0007] A wind turbine generator set, comprising a wind turbine, a second contactor, and a second circuit breaker, wherein a first end of the second circuit breaker is connected to the secondary winding of the first transformer, a second end of the second circuit breaker is connected to a first end of the second contactor, and a second end of the second contactor is connected to the wind turbine;

[0008] Wherein, when the wind turbine generator set is in a non-power generating state, the first contactor and the second contactor are disconnected.

[0009] In one embodiment, the wind power generation system further comprises:

[0010] A first voltage transformer, connected to the collector line, for detecting the voltage of the collector line;

[0011] a second voltage transformer, connected to the secondary winding of the first transformer, and used to detect the secondary side voltage of the first transformer;

[0012] Wherein, when the collector line voltage is synchronized with the secondary side voltage, the first contactor is closed and the first transformer is put into operation.

[0013] In one embodiment, the wind turbine generator set further comprises:

[0014] A converter, wherein a first end of the converter is connected to a first end of the second contactor, a second end of the converter is connected to the wind generator, and the converter is used to change a voltage and a frequency output by the wind generator.

[0015] In one embodiment, the ring main unit further includes a three-position switch, a first end of the three-position switch is connected to the second end of the first circuit breaker, and a second end of the three-position switch is connected to the first end of the first contactor.

[0016] In one embodiment, the box-type substation further includes:

[0017] A third circuit breaker, wherein a first end of the third circuit breaker is connected to the secondary winding of the first transformer, and a second end of the third circuit breaker is connected to the first end of the second circuit breaker, and is used to connect or disconnect the path where the secondary side line of the first transformer is located;

[0018] A fourth circuit breaker, wherein a first end of the fourth circuit breaker is connected to the secondary winding of the second transformer, and the fourth circuit breaker is connected to the control system of the wind turbine generator set, and is used for switching on or off the path where the secondary side line of the second transformer is located.

[0019] In one embodiment, the wind power generation system further comprises:

[0020] The box-type transformer protection and control device is connected to the first transformer and the second transformer respectively, and is used to detect the current signals of the first transformer and the second transformer to determine whether the box-type transformer substation has any abnormality.

[0021] In one embodiment, the box-type transformer protection measurement and control device includes:

[0022] A first current transformer, connected to the primary winding of the first transformer, and used to detect a first current signal of a primary side circuit of the first transformer;

[0023] a second current transformer, connected to the secondary winding of the first transformer, and used to detect a second current signal of a secondary side circuit of the first transformer;

[0024] The third current transformer is connected to the primary winding of the second transformer and is used to detect a third current signal of the primary side line of the second transformer.

[0025] In one embodiment, the second transformer is a high impedance transformer.

[0026] In one embodiment, the wind turbine generator set further includes an in-cabin electrical device, and the in-cabin electrical device is connected to the second transformer.

[0027] In one of the embodiments, the wind turbine generator set further includes a wind turbine controller, and the wind turbine controller is respectively connected to the second transformer, the first voltage transformer, and the second voltage transformer.

[0028] The above-mentioned wind power generation system includes a ring main unit, a box-type transformer substation and a wind turbine generator set, wherein the ring main unit includes a first circuit breaker and a first contactor, the box-type transformer substation includes a first transformer and a second transformer, and the wind turbine generator set includes a wind turbine, a second circuit breaker and a second contactor. When the wind turbine generator set is in a non-power generation state, the first contactor and the second contactor are disconnected, and the first transformer is out of operation, which can reduce the loss of the wind power generation system and increase the profit; since the first circuit breaker is not disconnected, the second transformer is still put into operation, which can provide working power for the wind turbine generator set and provide a power basis for the next smooth grid connection of the wind turbine generator set. Moreover, in the present application, the first transformer is put into operation or out of operation by closing or opening the first contactor instead of the first circuit breaker. Since the mechanical life of the first contactor is much longer than the mechanical life of the first circuit breaker, the durability and reliability of the system are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] FIG1 is a wind power generation system according to an embodiment;

[0031] FIG2 is a wind power generation system according to another embodiment;

[0032] Figure 3 A wind power generation system according to another embodiment;

[0033] FIG4 is a wind power generation system according to another embodiment;

[0034] Figure 5 A wind power generation system according to another embodiment;

[0035] Figure 6 The invention is a wind power generation system according to a specific embodiment.

[0036] Description of reference numerals:

[0037] 100-Ring main unit, 200-Box type substation, 300-Wind turbine generator set, 310-Converter, 320-Wind turbine controller. DETAILED DESCRIPTION

[0038] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first relay may be referred to as a second relay, and similarly, a second relay may be referred to as a first circuit breaker. Both the first relay and the second relay are relays, but they are not the same relay.

[0041] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0042] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0043] When used herein, the singular forms "a", "an" and "the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0044] In the current wind power generation system, each wind turbine is equipped with a box-type substation (referred to as box-type transformer). The high-voltage side of the box-type transformer is connected to the power grid, and the low-voltage side of the box-type transformer is connected to the wind turbine. The working mode of the wind turbine is intermittent. Only when the wind speed in the wind field meets the requirements can the wind turbine be connected to the grid for power generation. Even when the wind turbine is not generating electricity, the box-type transformer still needs to be operated with power. The long-term operation of the box-type transformer with power will increase the loss of the entire wind power generation system.

[0045] Based on this, the present application provides a wind power generation system to reduce the loss of the wind power generation system. As shown in FIG1 , the wind power generation system includes a ring main unit 100, a box-type transformer substation 200 and a wind turbine generator set 300. The ring main unit 100 includes a first circuit breaker Q1 and a first contactor K1, the box-type transformer substation 200 includes a first transformer T1 and a second transformer T2, and the wind turbine generator set 300 includes a wind turbine G, a second contactor K2 and a second circuit breaker Q2.

[0046] Among them, the first end of the first circuit breaker is connected to the collector line (the circle node on the left side of the first circuit breaker Q1 in Figure 1 represents the collector line connection point), the first end of the first contactor K1 is respectively connected to the second end of the first circuit breaker Q1 and the primary winding of the second transformer T2, the second end of the first contactor K1 is connected to the primary winding of the first transformer T1, the first end of the second circuit breaker Q2 is connected to the secondary winding of the first transformer T1, the second end of the second circuit breaker Q2 is connected to the first end of the second contactor K2, and the second end of the second contactor K2 is connected to the wind generator G.

[0047] When the wind turbine generator set 300 is normally connected to the grid, the first circuit breaker Q1, the first contactor K1, the second circuit breaker Q2 and the second contactor K2 are all in a closed state, and the first transformer T1 and the second transformer T2 are both put into operation.

[0048] When the wind turbine generator set is in a non-power generation state, the first contactor K1 and the second contactor K2 are disconnected, the first transformer T1 is out of operation, and the second transformer T2 is still in operation to provide working power for the wind turbine generator set 300. The non-power generation state of the wind turbine generator set 300 includes a standby state and a maintenance state. For example, when the wind turbine generator set 300 is shut down for 1 hour and the average wind speed for 5 minutes is less than or equal to 2.5m / s, it can be considered that the wind turbine generator set 300 enters a non-power generation state. At this time, the first contactor K1 is disconnected to make the first transformer T1 out of operation. At the same time, the second contactor K2 is disconnected, and the main circuit of the wind turbine generator set 300 exits the grid-connected operation. During the entire working process of the wind power generation system, the first circuit breaker Q1 is always closed, so the second transformer T2 is always in operation, which can provide working power for each electrical equipment in the wind turbine generator set 300.

[0049] In the embodiment of the present application, the closing and opening of the first contactor and the second contactor can be controlled by the wind turbine generator set.

[0050] In the embodiment of the present application, the wind power generation system includes a ring main unit 100, a box-type transformer substation 200 and a wind generator set 300, wherein the ring main unit 100 includes a first circuit breaker Q1 and a first contactor K1, the box-type transformer substation 200 includes a first transformer T1 and a second transformer T2, and the wind generator set 300 includes a wind generator G, a second contactor K2 and a second circuit breaker Q2. When the wind generator set 300 is in a non-power generation state, the first contactor K1 and the second contactor K2 are disconnected, and the first transformer T1 is out of operation, which can reduce the loss of the wind power generation system and increase the profit; since the first circuit breaker Q1 is not disconnected, the second transformer T2 is still in operation, which can provide working power for the wind generator set 300 and provide a power basis for the next smooth grid connection of the wind generator set 300. Moreover, in the present application, the first transformer T1 is put into operation or out of operation by closing or opening the first contactor K1, which can solve the problem of short mechanical life of the circuit breaker due to frequent switching of the circuit breaker when the first transformer is put into operation or out of operation by the traditional circuit breaker, and greatly improve the durability and reliability of the system.

[0051] In some embodiments, the second transformer may be a high impedance transformer.

[0052] In one embodiment, as shown in FIG2 , the wind power generation system further includes a first voltage transformer PT1 and a second voltage transformer PT2. The first voltage transformer PT1 is connected to the collector line for detecting the voltage of the collector line. The second voltage transformer PT2 is connected to the secondary winding of the first transformer T1 for detecting the secondary side voltage of the first transformer T1.

[0053] When the collector line voltage and the secondary side voltage are synchronized, the first contactor K1 is closed, so that the first transformer T1 can be put into operation without impact.

[0054] Exemplarily, when the wind turbine needs to switch from a non-power generation state to a power generation state, if there is no voltage on the secondary side of the first transformer T1, and the first contactor is directly closed to charge the first transformer T1, the excitation current of the first transformer T1 will cause the first contactor to overcurrent and burn out. In this application, when the first transformer T1 exits operation, the second transformer T2 continues to provide power to the wind turbine inverter 310 and the wind turbine controller 320. When the wind turbine control system detects that it can be connected to the power grid for operation, the wind turbine inverter 310 is soft-started to establish the wind turbine main circuit voltage, and the secondary side voltage of the first transformer T1 increases from zero to the rated voltage and is fed back to the high voltage side. At this time, the first voltage transformer PT1 and the second voltage transformer PT2 can both detect the collector line (i.e., the primary side voltage of the first transformer T1) and the secondary side voltage of the first transformer T1. The voltages on both sides of the first transformer T1 are connected to the fan controller 320, which automatically determines the amplitude and angle of the voltages on both sides of the first transformer T1, and continuously issues adjustment instructions to the fan converter 310, so that the amplitude and angle of the voltages on both sides of the first transformer T1 are in the same state, and then the fan controller 320 issues a closing instruction to the first contactor K1, so that the first transformer T1 is connected to the grid without impact. Subsequently, the fan controller 320 issues a closing instruction to the second contactor K2, and the wind turbine generator set 300 can be connected to the grid and generate electricity normally.

[0055] In one embodiment, the wind power generation system further includes a box-type transformer protection and control device. The box-type transformer protection and control device is connected to the first transformer T1 and the second transformer T2 respectively. The box-type transformer protection and control device can be used to detect the current signal T2 of the first transformer T1 and the second transformer to determine whether the box-type transformer substation 200 is abnormal.

[0056] Specifically, please continue to refer to Figure 2, the box transformer protection and control device includes a first current transformer CT1, a second current transformer CT2, and a third current transformer CT3. Among them, the first current transformer CT1 is connected to the primary winding of the first transformer T1, the second current transformer CT2 is connected to the secondary winding of the first transformer T1, and the third current transformer CT3 is connected to the primary winding of the second transformer T2.

[0057] The first current transformer CT1 can be used to detect the first current signal of the primary side line of the first transformer T1. The second current transformer CT2 can be used to detect the second current signal of the secondary side line of the first transformer T1. The third current transformer CT3 can be used to detect the third current signal of the primary side line of the second transformer T2. The box-type transformer protection and control device determines whether the box-type transformer substation 200 is abnormal according to the received first current signal, second current signal and third current signal.

[0058] In the embodiment of the present application, by setting up a box-type transformer protection measurement and control device to detect the current signals of the first transformer and the second transformer in the box-type transformer substation, abnormalities in the box-type transformer substation can be discovered in time to ensure the normal operation of the wind power generation system.

[0059] In one embodiment, Figure 3 As shown, the wind turbine generator set 300 also includes a converter 310. The first end of the converter 310 is connected to the first end of the second contactor K2, and the second end of the converter 310 is connected to the wind turbine. The converter 310 is also connected to the second transformer T2, and the working power supply of the converter 310 is provided by the second transformer T2. The converter 310 can be used to adjust the amplitude and angle of the output main circuit voltage of the wind turbine G, so that the output main circuit voltage of the wind turbine G can be synchronized with the voltage on the collector line side, thereby realizing the impact-free connection of the first transformer T1 into the power grid.

[0060] In one embodiment, please continue to refer to Figure 3 The wind turbine generator set 300 also includes a wind turbine controller 320, which is respectively connected to the second transformer T1, the first contactor K1, and the second contactor K1 for communication ( Figure 3 The second transformer T1 provides working power to the fan controller 320. The fan controller 320 can control the closing and opening of the first contactor K1 and the second contactor K2, and can send adjustment instructions to the converter 310.

[0061] In one embodiment, as shown in FIG4 , the ring main unit 100 further includes a three-position switch S. The first end of the three-position switch S is connected to the second end of the first circuit breaker Q1, and the second end of the three-position switch S is connected to the first end of the first contactor K1. The three working positions of the three-position switch S are the closing position, the isolating position, and the grounding position.

[0062] In one embodiment, Figure 5 As shown, the box-type substation 200 also includes a third circuit breaker Q3 and a fourth circuit breaker Q4. The first end of the third circuit breaker Q3 is connected to the secondary winding of the first transformer T1, the second end of the third circuit breaker Q3 is connected to the first end of the second circuit breaker Q2, and the first end of the fourth circuit breaker Q4 is connected to the secondary winding of the second transformer T2. The third circuit breaker Q3 is used to turn on or off the path where the secondary side line of the first transformer T1 is located, and the fourth circuit breaker Q4 is used to turn on or off the path where the secondary side line of the second transformer T2 is located. During the normal operation of the wind power generation system, the third circuit breaker Q3 and the fourth circuit breaker Q4 are always in a closed state. The third circuit breaker Q3 and the fourth circuit breaker Q4 are in an open state only when the wind power generation system is not put into use.

[0063] In one embodiment, the wind turbine generator set further includes an electrical device in the cabin, which is connected to a second transformer, and the second transformer can be used as a tower-based transformer to provide a working voltage for the electrical device in the cabin.

[0064] A more specific embodiment is listed to better illustrate the wind power generation system of the present application and its working process.

[0065] like Figure 6 As shown, the wind power generation system includes a ring main unit 100, a box-type transformer substation 200, a wind turbine generator set 300 and a box transformer protection and measurement and control device. The ring main unit 100 is provided with a first circuit breaker Q1, a three-position switch S and a first contactor K1. The box-type transformer substation 200 is provided with a first transformer T1, a third circuit breaker Q3, a second transformer T2 and a fourth circuit breaker Q4. The wind turbine generator set 300 is provided with a second circuit breaker Q2, a second contactor K2, a wind turbine generator G, a converter 310 and a wind turbine controller 320. The specific connection relationship of each component is not described here.

[0066] The working process of the wind power generation system is as follows:

[0067] S100, when the wind power generation system is just started, the first circuit breaker Q1, the three-position switch S, the second circuit breaker Q2, the third circuit breaker Q3 and the fourth circuit breaker Q4 are all in the closed position, the first transformer T1 is not put into operation, and the second transformer T2 is put into operation. The second transformer T2 provides working power to the converter 310 and the wind turbine control system 320. The converter 310 adjusts the output main circuit voltage amplitude and angle of the wind turbine G so that the output main circuit voltage of the wind turbine G can be synchronized with the voltage on the collector line side, thereby realizing the first transformer T1 being connected to the grid without impact.

[0068] S200, before the wind turbine generator set 300 is normally connected to the grid, the wind turbine controller 320 obtains the collector line voltage through the first voltage transformer, obtains the secondary side voltage of the first transformer T1 through the second voltage transformer (the positions of the first voltage transformer and the second voltage transformer can be referred to Figure 2), and determines whether the collector line voltage (i.e., the primary side voltage of the first transformer T1) and the secondary side voltage of the first transformer T1 are synchronized. When the collector line voltage and the secondary side voltage of the first transformer are synchronized, the first contactor K1 is controlled to close to realize the impact-free charging of the first transformer T1. Afterwards, the wind turbine controller 320 controls the second contactor K2 to close, and the wind turbine generator set 300 can be normally connected to the grid for power generation.

[0069] S300, when the wind turbine generator set 300 is not generating electricity, the wind turbine controller 320 controls the first contactor K1 and the second contactor K2 to disconnect, and the first transformer T1 is out of operation, thereby reducing the loss of the wind power generation system. The second transformer T2 is still in operation, and the second transformer T2 can replace the tower base transformer to provide working power for various electrical equipment in the wind turbine generator set 300, thereby further reducing the investment cost of the wind power generation system.

[0070] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A wind power generation system, characterized in that: The wind power generation system comprises: The ring main unit comprises a first circuit breaker and a first contactor, wherein a first end of the first circuit breaker is connected to a collector line, and a second end of the first circuit breaker is connected to a first end of the first contactor; A box-type substation, comprising a first transformer and a second transformer, wherein a primary winding of the first transformer is connected to a second end of the first contactor, and a primary winding of the second transformer is connected to a first end of the first contactor; A wind generator set, comprising a wind generator, a second contactor and a second circuit breaker, wherein a first end of the second circuit breaker is connected to the secondary winding of the first transformer, a second end of the second circuit breaker is connected to a first end of the second contactor, and a second end of the second contactor is connected to the wind generator; Wherein, when the wind turbine generator set is in a non-power generating state, the first contactor and the second contactor are disconnected.

2. The wind power generation system according to claim 1, characterized in that: The wind power generation system further comprises: A first voltage transformer, connected to the collector line, for detecting the voltage of the collector line; a second voltage transformer, connected to the secondary winding of the first transformer, and used to detect the secondary side voltage of the first transformer; Wherein, when the collector line voltage is synchronized with the secondary side voltage, the first contactor is closed and the first transformer is put into operation.

3. The wind power generation system according to claim 1, characterized in that: The wind turbine generator set further comprises: A converter, wherein a first end of the converter is connected to a first end of the second contactor, a second end of the converter is connected to the wind generator, and the converter is used to change a voltage frequency output by the wind generator.

4. The wind power generation system according to claim 1, characterized in that: The ring main unit further comprises a three-position switch, a first end of the three-position switch is connected to the second end of the first circuit breaker, and a second end of the three-position switch is connected to the first end of the first contactor.

5. The wind power generation system according to claim 1, characterized in that: The box-type substation also includes: A third circuit breaker, wherein a first end of the third circuit breaker is connected to the secondary winding of the first transformer, and a second end of the third circuit breaker is connected to the first end of the second circuit breaker, and is used to switch on or off the path where the secondary side line of the first transformer is located; A fourth circuit breaker, wherein a first end of the fourth circuit breaker is connected to the secondary winding of the second transformer, and the fourth circuit breaker is connected to the wind turbine generator set, and is used for switching on or off the path where the secondary side line of the second transformer is located.

6. The wind power generation system according to claim 1, characterized in that: The wind power generation system further comprises: A first current transformer, connected to the primary winding of the first transformer, and used to detect a first current signal of a primary side circuit of the first transformer; a second current transformer, connected to the secondary winding of the first transformer, and used to detect a second current signal of a secondary side circuit of the first transformer; The third current transformer is connected to the primary winding of the second transformer and is used to detect a third current signal of the primary side line of the second transformer.

7. The wind power generation system according to claim 6, characterized in that: The wind power generation system further comprises: The box-type transformer protection and control device is respectively connected to the first current transformer, the second current transformer and the third current transformer, and is used to detect the current signals of the first transformer and the second transformer to determine whether the box-type transformer station has any abnormality.

8. The wind power generation system according to claim 1, characterized in that: The second transformer is a high impedance transformer.

9. The wind power generation system according to claim 1, characterized in that: The wind turbine generator set further comprises an in-cabin electrical device, and the in-cabin electrical device is connected to the second transformer.

10. The wind power generation system according to claim 1, characterized in that: The wind turbine generator set further includes a wind turbine controller, which is respectively connected to the second transformer, the first contactor, the first circuit breaker, the second circuit breaker, and the second contactor.

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