Primary electrical loop system of wind generating set and wind generating set

Abstract

The utility model discloses a primary electrical loop system of a wind generating set and the wind generating set, which comprises a current transformer, a box-type transformer, an auxiliary transformer, a generator and a power grid, a grid-side circuit breaker is cancelled in the current transformer, and a machine-side converter is connected with the generator. A grid-side converter is connected with a low-voltage-side circuit breaker of the box-type transformer, grid-connected and off-grid switching is achieved through the low-voltage-side circuit breaker of the box-type transformer, a high-voltage-side circuit breaker of the box-type transformer is connected with a power grid, and the auxiliary transformer is connected between the low-voltage-side circuit breaker of the box-type transformer and a transformer body. According to the utility model, the purpose of reducing the cost can be achieved without influencing the safety and maintenance requirements of the wind generating set.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generator sets, in particular to a primary electrical circuit system of a wind power generator set and a wind power generator set. Background Art

[0002] With the development of large-scale wind turbines, the unit capacity of wind turbines has gradually developed from the original 2MW and 3MW to 8MW, 12MW and even 20MW, and the application environment has changed from onshore to offshore. At the same time, due to cost reasons, there are models with converters and box transformers installed on top. At this time, the dual design of the box transformer low-voltage side circuit breaker and the circuit breaker inside the converter has no cost advantage. In order to meet the purpose of cost reduction, the currently available solution is to cancel the box transformer low-voltage cabinet, but the disadvantage of this design is that if the circuit breaker in the high-voltage cabinet is not disconnected, the cables and related electrical components between the box transformer and the converter circuit breaker cannot be maintained, which brings inconvenience to the safety and maintenance of the unit. Therefore, a new primary electrical circuit solution needs to be designed. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a primary electrical circuit system of a wind turbine generator set, which can achieve the purpose of reducing costs without affecting the safety and maintenance requirements of the wind turbine generator set.

[0004] Another object of the utility model is to provide a wind turbine generator set.

[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] A primary electrical circuit system of a wind turbine generator set comprises a converter, a box-type transformer, an auxiliary transformer, a generator and a power grid, wherein the grid-side circuit breaker is eliminated inside the converter, the machine-side converter is connected to the generator, the grid-side converter is connected to the low-voltage side circuit breaker of the box-type transformer, and the on-grid and off-grid switching is achieved through the low-voltage side circuit breaker of the box-type transformer, the high-voltage side circuit breaker of the box-type transformer is connected to the power grid, and the auxiliary transformer is connected between the low-voltage side circuit breaker of the box-type transformer and the transformer body.

[0007] Furthermore, the controller of the converter is connected to the low-voltage side circuit breaker of the box-type transformer in a hard-wired manner.

[0008] Furthermore, the box-type transformer comprises a high-voltage side circuit breaker, a transformer body and a low-voltage side circuit breaker which are sequentially connected in series.

[0009] Furthermore, the box-type transformer is also provided with a protection device, which is respectively connected to the high-voltage side circuit breaker and the low-voltage side circuit breaker.

[0010] Furthermore, the high-voltage side circuit breaker and the low-voltage side circuit breaker are independently formed into cabinets.

[0011] Furthermore, the wind turbine generator set takes electricity from its own power supply located between the transformer body and the low-voltage side circuit breaker, and after being transformed to 400V by the auxiliary transformer, it supplies power to the internal equipment of the wind turbine.

[0012] Another purpose of the utility model can be achieved by adopting the following technical solutions:

[0013] A wind turbine generator set comprises the primary electrical circuit system of the wind turbine generator set described above.

[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0015] 1. The electrical circuit system of the utility model eliminates the grid-side circuit breaker inside the converter, which has lower cost and simpler structure.

[0016] 2. The overall structure of the electrical circuit system of the utility model is simple, which is more conducive to the safety and maintenance of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the electrical circuit system of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] Embodiment 1:

[0020] like Figure 1As shown, this embodiment provides a primary electrical circuit system of a wind turbine generator set, including a converter 1, a box-type transformer 2, an auxiliary transformer 3, a generator 4 and a power grid 5. The grid-side circuit breaker is eliminated inside the converter 1, and its machine-side converter is connected to the generator 4 through a machine-side circuit breaker 6, and its grid-side converter is connected to the low-voltage side circuit breaker 8 of the box-type transformer 2. The high-voltage side circuit breaker 7 of the box-type transformer 2 is connected to the power grid 5. The unstable electric energy generated by the generator 4 can be converted into electric energy with stable frequency and amplitude that meets the requirements of the power grid 5 through the converter 1, and then incorporated into the power grid 5. The low-voltage side circuit breaker 8 of the box-type transformer 2 can be used to achieve on-grid and off-grid switching. The auxiliary transformer 3 can be connected between the low-voltage side circuit breaker 8 of the box-type transformer 2 and the transformer body.

[0021] The controller 9 built into the converter 1 can realize functions such as signal conditioning, control signal generation, and communication. The controller 9 is connected to the low-voltage side circuit breaker 8 in a hard-wired manner.

[0022] The box-type transformer 2 includes a high-voltage side circuit breaker 7, a transformer body and a low-voltage side circuit breaker 8 connected in series in sequence. The high-voltage side circuit breaker 7 and the low-voltage side circuit breaker 8 are independently formed into cabinets, namely, a high-voltage switch cabinet and a low-voltage switch cabinet. The box-type transformer 2 is also equipped with a protection device 10, which is connected to the high-voltage side circuit breaker 7 and the low-voltage side circuit breaker 8 respectively. The protection device 10 monitors and protects the operating state of the box-type transformer 2. When a fault occurs, the high-voltage side circuit breaker 7 or the low-voltage side circuit breaker 8 can be controlled to be disconnected.

[0023] The wind turbine's self-powered electricity is drawn from between the transformer body and the low-voltage side circuit breaker. After being transformed to 400V by the auxiliary transformer, it supplies power to the internal equipment of the wind turbine.

[0024] In this embodiment, the low-voltage side circuit breaker 8 can be controlled by the converter 1 and the protection device 10, specifically:

[0025] When the wind speed and rotation speed do not meet the unit startup requirements, the wind turbine unit enters the shutdown or standby mode, and the low-voltage switchgear is in the disconnected state;

[0026] When the wind speed and rotation speed meet the unit startup requirements, the converter 1 controls the low-voltage side circuit breaker 8 to close through hard wiring to complete the startup operation;

[0027] If the converter detects a fault during the startup process, it will disconnect the low-voltage circuit breaker inside the low-voltage switch cabinet through hard wiring, and the wind turbine will enter the fault shutdown mode;

[0028] If the protection device detects a fault during the startup process, it will control the low-voltage side circuit breaker inside the low-voltage switch cabinet to disconnect, and at the same time disconnect the high-voltage side circuit breaker in the high-voltage switch cabinet.

[0029] Embodiment 2:

[0030] This embodiment provides a wind turbine generator set, including the primary electrical circuit system of the wind turbine generator set described in Embodiment 1.

[0031] The above is only a preferred embodiment of the utility model patent, but the protection scope of the utility model patent is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the utility model patent according to the technical solution of the utility model patent and its utility model patent concept, which are all within the protection scope of the utility model patent.

Claims

1. A primary electrical circuit system of a wind turbine generator set, characterized in that: The utility model comprises a converter, a box-type transformer, an auxiliary transformer, a generator and a power grid. The grid-side circuit breaker is eliminated inside the converter, the machine-side converter is connected to the generator, the grid-side converter is connected to the low-voltage side circuit breaker of the box-type transformer, and the on-grid and off-grid switching is realized through the low-voltage side circuit breaker of the box-type transformer. The high-voltage side circuit breaker of the box-type transformer is connected to the power grid, and the auxiliary transformer is connected between the low-voltage side circuit breaker of the box-type transformer and the transformer body.

2. The primary electrical circuit system of a wind turbine generator set according to claim 1, characterized in that: The controller of the converter is connected to the low-voltage side circuit breaker of the box-type transformer in a hard-wired manner.

3. The primary electrical circuit system of a wind turbine generator set according to claim 1, characterized in that: The box-type transformer comprises a high-voltage side circuit breaker, a transformer body and a low-voltage side circuit breaker which are sequentially connected in series.

4. The primary electrical circuit system of a wind turbine generator set according to claim 3, characterized in that: The box-type transformer is also equipped with a protection device, which is respectively connected to the high-voltage side circuit breaker and the low-voltage side circuit breaker.

5. The primary electrical circuit system of a wind turbine generator set according to claim 3, characterized in that: The high-voltage side circuit breaker and the low-voltage side circuit breaker are independently formed into cabinets.

6. The primary electrical circuit system of a wind turbine generator set according to claim 1, characterized in that: The wind turbine generator set takes electricity from its own power supply between the transformer body and the low-voltage side circuit breaker, and after being transformed to 400V by the auxiliary transformer, it supplies power to the internal equipment of the wind turbine.

7. A wind turbine generator set, characterized in that: A primary electrical circuit system of a wind turbine generator set comprising any one of claims 1 to 6.

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