Box-type transformer and converter integrated electrical system of wind turbine generator

Abstract

The utility model discloses a wind turbine generator set box-type transformer and converter integrated electrical system which comprises a box-type transformer, a converter, a high-voltage switch cabinet, a generator and a container, the container is placed on the outer side of a tower of a wind turbine generator set, and the box-type transformer and the converter are placed in the container. The motor side of the converter is connected with a generator of the wind turbine generator, the power grid side of the converter is connected with the low-voltage side of the box-type transformer, the low-voltage side of the box-type transformer is subjected to timely on-off protection through a circuit breaker in the converter, and the high-voltage side of the box-type transformer is connected with a power grid through a high-voltage switch cabinet. The high-voltage switch cabinet is connected with a controller in the converter through a signal line, and the controller increases a control signal for the high-voltage switch cabinet to control the breaking of a circuit breaker, so that the circuit breaker in the converter is synchronously tripped off when the high-voltage switch cabinet is disconnected. According to the utility model, the problem that the converter is difficult to maintain and dissipate heat can be solved while the cost reduction requirement is met.

Description

Technical Field

[0001] This utility model relates to the technical field of new energy power generation, and in particular to an integrated electrical system for wind turbine box-type transformers and converters. Background Technology

[0002] With the increasing size of wind turbines, the single unit capacity of wind turbines has gradually increased from the original 2MW and 3MW to 8MW, 12MW and even 15MW. As a result, the size of the converters has also become larger and larger, and the problems of difficult maintenance and heat dissipation of the converters urgently need to be solved.

[0003] Converters and box-type transformers (referred to as box-type transformers) are important components of wind turbine units. There are two placement methods within the wind turbine: the first is placing them in the nacelle, and the second is placing them at the tower base. For the first method, the cable costs from the generator to the converter and from the converter to the box-type transformer are significantly reduced, but the convenience of converter maintenance and commissioning is sacrificed. For the second method, the cable costs are relatively higher, and solving the heat dissipation problem of the converter within the tower base is a challenge, but the convenience of converter maintenance and the overall safety of the turbine are improved. Utility Model Content

[0004] The purpose of this utility model is to simultaneously consider the ease of maintenance and heat dissipation requirements of the converter, and to provide an integrated electrical system for wind turbine transformers and converters. By placing the transformer and converter in a container located outside the tower, the convenience of converter maintenance and commissioning can be improved. The tower base no longer needs to be designed with additional heat dissipation for the converter. Due to the improved ambient temperature and heat dissipation environment, the internal cooling system of the converter can be further reduced in cost. At the same time, the converter is placed outside the tower and does not need to participate in the tower hoisting or nacelle hoisting, which reduces the hoisting difficulty and alleviates the pressure on the design and production cycle of the converter.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: an integrated electrical system for a wind turbine transformer and converter, comprising a transformer, converter, high-voltage switchgear, generator, and container. The container is placed outside the wind turbine tower, and the transformer and converter are placed inside the container. The generator side of the converter is connected to the generator of the wind turbine, and the grid side of the converter is connected to the low-voltage side of the transformer. A circuit breaker inside the converter provides timely protection against voltage drops on the low-voltage side of the transformer. The high-voltage side of the transformer is connected to the power grid via the high-voltage switchgear. The high-voltage switchgear is connected to a controller inside the converter via a signal line. The controller adds a control signal to the high-voltage switchgear to control the circuit breaker's tripping, so that the circuit breaker inside the converter trips simultaneously when the high-voltage switchgear is disconnected.

[0006] Specifically, the box-type transformer and the converter share a common heat dissipation system.

[0007] Specifically, the grid side of the converter is connected to the low-voltage side of the box-type transformer using copper busbars.

[0008] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0009] 1. Considering the close proximity between the box-type transformer and the converter, the low-voltage side of the box-type transformer can be directly connected to the grid side of the converter using copper busbars, reducing the problem of increased spatial distance caused by cable laying and further reducing the container volume.

[0010] 2. The converter and the box-type transformer are connected nearby using copper busbars, eliminating the need for a low-voltage switchgear. The circuit breaker inside the converter is used for protection, which can further reduce costs.

[0011] 3. Move the converter out of the tower to improve its heat dissipation efficiency.

[0012] 4. The box-type transformer and the converter share a common cooling and heat dissipation system, reducing the heat dissipation requirements of the tower base.

[0013] 5. The converter's maintenance space is easily adjustable, facilitating maintenance and improving operation and maintenance efficiency.

[0014] 6. The converter does not participate in the hoisting of the tower and nacelle, reducing the difficulty of hoisting and alleviating the pressure on the converter's design and production cycle.

[0015] 7. Converter maintenance does not require going to the nacelle or tower base, greatly improving maintenance convenience. At the same time, during grid connection commissioning, commissioning can be carried out outside the container, which can prevent potential dangers during the commissioning process.

[0016] 8. The controller inside the converter adds a control signal for the high-voltage switchgear to trip the circuit breaker. When the high-voltage switchgear is disconnected, the circuit breaker of the converter is tripped simultaneously, which can effectively protect the box-type transformer and the converter. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the existing wind turbine electrical system.

[0018] Figure 2 This is a schematic diagram of the existing electrical system of a wind turbine.

[0019] Figure 3 The schematic diagram of the integrated electrical system provided by this utility model.

[0020] Figure 4A schematic diagram of the integrated electrical system provided by this utility model. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0022] like Figure 1 and Figure 2 As shown, the existing wind turbine electrical system generally includes a box-type transformer 01, a converter 02, a high-voltage switchgear 03, a generator 04, and a low-voltage switchgear 05. Generally, the box-type transformer 01 and the high-voltage switchgear 03 are integrated. In addition, when the box-type transformer 01 is placed outside the tower 08, the distance between the converter 02 and the box-type transformer 01 is relatively far. In this case, the box-type transformer 01 also integrates the low-voltage switchgear 05. The grid side of the converter 02 is connected to the low-voltage side of the box-type transformer 01 through the low-voltage switchgear 05, and its motor side is connected to the generator 04. The high-voltage side of the box-type transformer 01 is connected to the power grid 06 through the high-voltage switchgear 03. The unstable electrical energy generated by the generator 04 is converted into electrical energy with stable frequency and amplitude that meets the requirements of the power grid and then fed into the power grid 06. The converter 02 has a built-in controller 07 to realize functions such as signal conditioning, control signal generation, and communication.

[0023] like Figure 3 and Figure 4 As shown in the figure, the wind turbine integrated electrical system of box-type transformer and converter provided in this embodiment includes a box-type transformer 1, a converter 2, a high-voltage switchgear 3, a generator 4, and a container 5. The container 5 is placed outside the wind turbine tower 8, and the box-type transformer 1 and converter 2 are placed inside the container 5, which is different from... Figure 2The existing layout shown typically places the converter 02 on the first-floor platform of the tower 08 and connects it to the box-type transformer 01 outside the tower 08 via a cable. However, this embodiment places both the box-type transformer 1 and the converter 2 outside the tower 8. This reduces the component density on the tower 8 platform, improves heat dissipation at the bottom of the tower 8, and allows the box-type transformer 1 and converter 2 to share a common cooling system, solving the problem of heat dissipation difficulties for the converter 2 inside the tower 8. Furthermore, placing the converter 2 outside the tower 8 allows for easier adjustment of its maintenance space, freeing it from the constraints of the tower 8 space and improving operational efficiency. The motor side of the converter 2 is connected to the generator 4 of the wind turbine, and the grid side of the converter 2 is connected to the low-voltage side of the box-type transformer 1, and the connection is made through the internal wiring of the converter 2. The circuit breaker (not shown in the figure) in the converter 2 provides timely interruption protection for the low-voltage side of the box-type transformer 1. Therefore, the circuit breaker in the converter 2 can simultaneously perform the interruption and protection functions for the low-voltage side of the box-type transformer 1, thus eliminating the need for the existing low-voltage switchgear and retaining only the circuit breaker inside the converter 2, reducing the overall unit cost per kilowatt-hour. The high-voltage side of the box-type transformer 1 is connected to the power grid 6 via the high-voltage switchgear 3. Simultaneously, for the overall operational safety of the box-type transformer 1 and the converter 2, the high-voltage switchgear 3 is connected to the controller 7 inside the converter 2 via a signal line. The controller 7 adds a control signal to the high-voltage switchgear 3 to control the circuit breaker tripping, so that the circuit breaker inside the converter 2 trips simultaneously when the high-voltage switchgear 3 disconnects. This effectively protects both the box-type transformer 1 and the converter 2. Furthermore, since the box-type transformer 1 and the converter 2 are close together, the power grid side of the converter 2 and the low-voltage side of the box-type transformer 1 can be directly connected via copper busbars 9 to further reduce costs.

[0024] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An integrated electrical system for a wind turbine generator set, comprising a box-type transformer and a converter, characterized in that, The system includes a box-type transformer (1), a converter (2), a high-voltage switchgear (3), a generator (4), and a container (5). The container (5) is placed outside the tower (8) of the wind turbine. The box-type transformer (1) and the converter (2) are placed inside the container (5). The motor side of the converter (2) is connected to the generator (4) of the wind turbine. The grid side of the converter (2) is connected to the low-voltage side of the box-type transformer (1). The low-voltage side of the box-type transformer (1) is protected by a circuit breaker inside the converter (2). The high-voltage side of the box-type transformer (1) is connected to the power grid (6) through the high-voltage switchgear (3). The high-voltage switchgear (3) is connected to the controller (7) inside the converter (2) through a signal line. The controller (7) adds a control signal to the high-voltage switchgear (3) to control the circuit breaker to trip, so that the circuit breaker inside the converter (2) trips simultaneously when the high-voltage switchgear (3) trips.

2. The integrated electrical system of wind turbine box-type transformer and converter according to claim 1, characterized in that, The box-type transformer (1) and the converter (2) share a common heat dissipation system.

3. The integrated electrical system of wind turbine box-type transformer and converter according to claim 1, characterized in that, The grid side of the converter (2) is connected to the low-voltage side of the box transformer (1) by a copper busbar (9).

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