Converter and wind generating set comprising same
By optimizing the layout and heat dissipation design of the converter, the existing converters have large volume, high cost and high failure rate, and achieve higher volume power density and lower cost.
Patent Information
- Application Number
- CN202421170200.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing converters are large in size, occupy a lot of space, and are unreasonable in layout design, resulting in long paths of main loops, high cost, and unreasonable in heat dissipation design, resulting in high device failure rate.
Design a converter with high volume power density, and optimize the device layout and heat dissipation design by arranging grid-connected cabinets and power cabinets side by side, including setting up a heat dissipation device in the grid-connected cabinets and power cabinets to ensure that all devices are in a good heat dissipation environment.
The internal layout of the converter is rationalized, the length of the connecting busbar is shortened, the material cost is reduced, the reliability and performance of the converter is improved, the number of platforms is reduced, and the overall cost is reduced.
Smart Images
Figure CN222582278U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electric control, in particular to a converter and a wind power generator set comprising the converter. Background Art
[0002] The converter of a wind turbine is an important component of the wind turbine. Its function in the wind turbine is to convert the electric energy generated by the wind turbine generator into AC power corresponding to the frequency, phase and amplitude of the power grid. As a power conversion device, the converter is in the main power generation circuit of the wind turbine and is irreplaceable.
[0003] The converter may include a grid-side circuit breaker, a stator contactor, a machine-side reactor, a power module, a capacitor pool, a grid-side reactor, a grid-side filter capacitor pool, a brake module, and a brake resistor, etc. Since the existing converter is large in size and the internal space of the wind turbine is limited, the size of the converter will directly affect the layout design inside the wind turbine and the cost of the wind turbine. The layout design of the existing converter is not reasonable enough, and the paths between the various components inside it are long, resulting in a long main circuit path and high cost. In addition, the heat dissipation design inside the existing converter is unreasonable, resulting in some components and connecting busbars being unable to obtain a good heat dissipation environment, so that a larger specification connecting busbar needs to be selected to meet the temperature requirements, which indirectly increases the cost. In addition, the components in the converter cannot be well cooled, which will lead to a high failure rate and affect the performance of the entire converter. Utility Model Content
[0004] The utility model provides a converter with high volume power density and a wind power generator set comprising the converter, so as to solve the technical problem that the existing converter occupies a large space.
[0005] The utility model provides a converter, which comprises a grid-connected cabinet and a power cabinet arranged side by side, wherein the grid-connected cabinet comprises a grid-side filter capacitor pool, a stator contactor, a grid-side circuit breaker and a stator connection busbar located above the stator contactor; and the power cabinet comprises a capacitor pool, a power module, a grid-side fuse, a machine-side reactor and a grid-side reactor.
[0006] According to the utility model, the number of the grid-side circuit breakers and the number of the stator contactors may be the same, and the grid-side circuit breakers may be located below the stator contactors.
[0007] According to the utility model, the grid-side fuse may be located on a connection path between the power module and the grid-side reactor.
[0008] According to the utility model, the capacitor pool may be located above the power module, and may be connected to the power module via a stacked busbar.
[0009] According to the utility model, the converter may further include a brake module located on the side of the machine-side reactor and a battery pack and a brake resistor located on the top of the power cabinet.
[0010] According to the utility model, the number of the power modules can be 3, 6 or 9.
[0011] According to the utility model, the grid-connected cabinet may further include a first heat dissipation device located above the stator contactor.
[0012] According to the utility model, the power cabinet may further include a second heat dissipation device located between the power module and the grid-side fuse.
[0013] According to the utility model, the power cabinet may further include a third heat dissipation device located between the second heat dissipation device and the grid-side fuse.
[0014] The utility model also provides a wind generating set, and the wind generating set comprises the converter as described above.
[0015] According to the converter of the utility model, the internal layout of the converter is more reasonable, the busbars connected on the main circuit are not crossed, the length of the busbars is greatly shortened, and the material cost of the busbars is reduced.
[0016] According to the converter of the utility model, the internal heat dissipation scheme of the converter is better, all devices are in a good heat dissipation environment, the failure rate of the devices is effectively reduced, and the reliability of the converter is improved; in addition, all connecting busbars can achieve good heat dissipation, thereby reducing the cross-section selection of the connecting busbars and reducing the material cost of the connecting busbars.
[0017] According to the converter of the utility model, the layout of the converter is reasonable, so that the volume is smaller at the same power level and the volume power density is improved, so that the converter and other equipment in the wind turbine generator set are placed on the same platform, which reduces the number of platforms and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic diagram showing a structural layout of a converter according to an exemplary embodiment of the present utility model;
[0019] Figure 2 is a schematic diagram schematically showing the connection relationship between various components of the converter according to an exemplary embodiment of the present utility model;
[0020] Figure 3 is a front view schematically showing a heat dissipation cycle of a power grid cabinet of a converter according to an exemplary embodiment of the present utility model;
[0021] Figure 4is a side view schematically showing a heat dissipation cycle of a power grid cabinet of a converter according to an exemplary embodiment of the present utility model;
[0022] Figure 5 is a side view schematically showing a heat dissipation cycle of a power cabinet of a converter according to an exemplary embodiment of the present utility model. DETAILED DESCRIPTION
[0023] The following is a detailed description of the exemplary embodiments of the present utility model in conjunction with the accompanying drawings. In the entire specification, the same reference numerals always indicate the same components.
[0024] Figure 1 is a schematic diagram showing a structural layout of a converter according to an exemplary embodiment of the present utility model; Figure 2 is a schematic diagram schematically showing the connection relationship between various components of the converter according to an exemplary embodiment of the present utility model; Figure 3 is a front view schematically showing a heat dissipation cycle of a power grid cabinet of a converter according to an exemplary embodiment of the present utility model; Figure 4 is a side view schematically showing a heat dissipation cycle of a power grid cabinet of a converter according to an exemplary embodiment of the present utility model; Figure 5 is a side view schematically showing a heat dissipation cycle of a power cabinet of a converter according to an exemplary embodiment of the present utility model.
[0025] like Figure 1 and Figure 2 As shown, according to an exemplary embodiment of the utility model, a grid-connected cabinet 1000 and a power cabinet 2000 are arranged side by side with converters, the grid-connected cabinet 1000 includes a grid-side filter capacitor pool 30, a stator contactor 40, a grid-side circuit breaker 50 and a stator connection busbar 41 located above the stator contactor 40; the power cabinet 2000 includes a capacitor pool 300, a power module 400, a grid-side fuse 51, a machine-side inductor 900 and a grid-side inductor 901.
[0026] In an exemplary embodiment, for the power cabinet 1000, the external stator cable enters the power cabinet 1000 from the top of the converter, is connected to the stator connection busbar 41 located above the stator contactor 40, and is connected to the upper incoming line terminal of the stator contactor 40, and the connection path is short. The lower outgoing line terminal of the stator contactor 40 is directly connected to the upper incoming line terminal of the grid-side circuit breaker 50, and the lower outgoing line terminal of the grid-side circuit breaker 50 is connected to the grid-side connection busbar located below the grid-side circuit breaker 50, and the grid-connected cable is connected to the grid-side connection busbar, and the grid-connected cable extends from the bottom of the power cabinet 1000 to the outside.
[0027] In an exemplary embodiment, the number of grid-side circuit breakers 50 is the same as that of stator contactors 40, and the grid-side circuit breakers 50 are located below the stator contactors 40, so that the connection path between the two is short and the energy flow is smoother. The grid-side filter capacitor pool 30 is connected to the incoming line terminal of the stator contactor 40 through a cable.
[0028] In an exemplary embodiment, for the power cabinet 2000, the external rotor cable enters from the front of the machine-side inductor 900 at the bottom of the power cabinet 2000 and is connected to the rotor connection busbar, which is connected to the inlet terminal of the machine-side inductor 900 at the bottom, and the outlet terminal of the machine-side inductor 900 at the top is connected to the inlet terminal of the machine-side power module 400 located above the machine-side inductor 900 through the rotor connection busbar, and the outlet terminal of the machine-side power module 400 located at the top is connected to the inlet terminal of the capacitor pool 300 located above the power module 400. The outgoing end of the capacitor pool 300 is connected to the incoming end of the grid-side power module of the power module 400, the outgoing end of the grid-side power module of the power module 400 is connected to the incoming end of the grid-side fuse 51 located below the power module 400, the outgoing end of the grid-side fuse 51 is connected to the incoming end of the grid-side reactor 901 located at the bottom, and the outgoing end of the grid-side reactor 901 located at the top is connected to the stator connection busbar 41 between the stator contactor 40 and the grid-side circuit breaker 50 of the grid-connected cabinet 1000, and is connected to the grid-connected cable through the grid-side circuit breaker 50 and then extends out of the power cabinet 2000.
[0029] In an exemplary embodiment, the grid-side fuse 51 is located on a connection path between the grid-side power module of the power module 400 and the grid-side reactor 901 , thereby effectively shortening the connection path.
[0030] In an exemplary embodiment, the capacitor pool 300 is located above the power module 400 and is connected to the power module 400 through a stacked busbar, so that the connection path is short and the stray inductance is small.
[0031] Optionally, if the machine-side power is large, the machine-side power modules of the power module 400 may be 6 (in this case, the total number of power modules 400 may be 9, and the other 3 are grid-side power modules, and the 3 grid-side power modules are respectively connected to the incoming line terminals of the grid-side reactor 901 below them using a connecting busbar), and the connecting busbar is respectively connected to the corresponding incoming line terminals of the machine-side reactor 900 below them. The outgoing line terminal of the machine-side reactor 900 extends out of the rotor connecting busbar as a lap joint of the rotor cable.
[0032] Although it is described above as an example that the number of the power modules 400 may be 9, the present invention is not limited thereto, and the total number of the power modules 400 may also be 3 or 6, etc.
[0033] In an exemplary embodiment, the converter may further include a brake module 800 located at a side of the machine-side reactor 900 , and a battery pack 100 and a brake resistor 200 located at a top of the power cabinet 2000 .
[0034] The brake module 800 and the brake resistor 200 are connected to the capacitor pool 300 through a cable to achieve its braking function. Specifically, the positive and negative electrodes of the brake module 800 are connected to the positive and negative electrodes of the capacitor pool 300, respectively, and one end of the brake resistor 200 is connected to the AC end of the brake module 800, and the other end is connected to the positive electrode of the capacitor pool 300.
[0035] like Figure 2 As shown, the wiring path of the entire main circuit is similar to a lowercase "h". From the stator side to the grid-connected path, the stator cable enters from the top and the grid-connected cable exits from the bottom. The entire circuit belongs to an upper and lower structure, similar to the number "1". At the same time, the three phases of each device of the stator contactor 40 and the grid-side circuit breaker 50 are merged to become one phase of the system. On the rotor excitation circuit, the wiring row of the grid-side circuit breaker 50 is located on the rear side of the grid-connected cabinet 1000, and the incoming wiring row of the grid-side reactor 901 is also set on the rear side of the power cabinet 2000. There is no crossover or obstruction between the connecting busbars, and the wiring scheme is simple and convenient. The wiring terminal of the power module 400 is located on the front side of the power cabinet 400. By utilizing the characteristics of the grid-side reactor 901 itself, the connection terminal with the power module 400 is set on the front side of the power cabinet 2000, which can effectively shorten the length of the connection row. The capacitor pool 300 is located directly above the power module 400. Therefore, all DC connection rows between the power module 400 and the capacitor pool 300 are located above the power module 400. All AC connection rows between the power module 400 and the grid-side reactor 901 and the machine-side reactor 900 are located below the power module 400. The DC and AC are completely separated and do not cross each other to avoid interference. The wiring path of the entire rotor excitation circuit is similar to structure.
[0036] Refer to the following Figures 3 to 5 A heat dissipation device for a converter according to an exemplary embodiment of the present utility model is described in detail.
[0037] In an exemplary embodiment, the power cabinet 1000 may further include a first heat sink 10 located above the stator contactor 40 .
[0038] Alternatively, if Figure 3 and Figure 4As shown, the grid cabinet 1000 is an overall air-cooled heat dissipation cycle. The first heat dissipation device 10 is arranged above the stator contactor 40. The air with a lower temperature outside the grid cabinet 1000 is sucked into the first heat dissipation device 10 from the lower part of the front door plate of the grid cabinet 1000 near the grid-side outlet busbar, and blows upward into the grid cabinet 1000. The stator connection busbar 41, the grid-side circuit breaker 50, the UPS power supply 20, and the stator contactor 40 in the grid cabinet 1000 are cooled from bottom to top to achieve heat dissipation of these components and the stator connection busbar 41. The direction of the wind also conforms to the physical law that hot air goes upward, which is more conducive to heat dissipation in the grid cabinet 1000. The first heat dissipation device 10 may include three cooling fans, one corresponding to each cooling fan. Here, all the connecting busbars 41, stator contactors 40 and stator cable inlets are located directly opposite the air inlet of the first heat dissipation device 10. The routing of all devices and stator connecting busbars in the power cabinet 1000 is consistent with the direction of the cooling air duct in the power cabinet 1000, the heat dissipation is smoother, the impact on wind speed is minimal, and the heat dissipation effect is excellent.
[0039] In an exemplary embodiment, the power cabinet 2000 may further include a second heat sink 600 located between the power module 400 and the grid-side fuse 51 , and a third heat sink 700 located between the second heat sink 600 and the grid-side fuse 51 .
[0040] Optionally, the power cabinet 2000 is divided into two upper and lower air-cooled heat dissipation cycles, and the power module 400 includes 9 power modules as an example for description. The 9 power modules 400 and the capacitor pool 300 form an upper heat dissipation cycle; the grid-side reactor 901, the grid-side fuse 51, the machine-side reactor 900, and the brake module 800 form a lower heat dissipation cycle, and the two heat dissipation cycles are independent of each other. Figure 5As shown, in the heat dissipation cycle above, 9 power modules 400 are located in the middle, a capacitor pool 300 is arranged above, and a second heat dissipation device 600 is arranged below the power module 400. The second heat dissipation device 600 may include 3 heat dissipation fans. The cold air with a lower external temperature sucked by the heat dissipation fan through the upper door panel of the power cabinet 2000 directly dissipates the power module 400 and the capacitor pool 300 as a whole. After passing through the capacitor pool 300, the busbar connecting the power module 400 and the capacitor pool 300, and the power module 400, the wind enters the heat dissipation fan and is guided to the outside at the rear of the power cabinet 2000, realizing the air-cooled heat dissipation cycle of the upper half of the power cabinet 2000. Among them, the capacitor pool 300 generates less heat, but is sensitive to temperature, the power module 400 generates more heat but is not very sensitive to temperature, the capacitor pool 300 is located above the power module 400, and the external cold air dissipates the heat of the capacitor pool 300 and then passes downward through the power module 400 into the fan. The hot air of the power module 400 will not enter the capacitor pool 300, which can better meet the different temperature sensitivity characteristics of the power module 400 and the capacitor pool 300, so that the power module 400 and the capacitor pool 300 can achieve the best heat dissipation effect.
[0041] In the heat dissipation cycle below, the third heat dissipation device 700 may include three heat dissipation fans, which are arranged above the grid-side reactor 901 and the machine-side reactor 900. There are two air inlets, which are respectively located at the bottom of the cabinet body and the door panel of the power cabinet 2000. The bottom air inlet is the main air inlet, with a large opening and short air inlet paths. The cold air outside the cabinet of the power cabinet 2000 directly dissipates the grid-side reactor 901 and the machine-side reactor 900, and the heat dissipation effect is better; the air inlet on the door panel is an auxiliary air inlet, with a small opening, but close to the grid-side fuse 51. Because the grid-side fuse 51 is sensitive to temperature, it is directly arranged near the auxiliary air inlet. The cold air outside the cabinet of the power cabinet 2000 directly dissipates the grid-side fuse 51 and the rotor connection busbar here. The air temperature is low and the wind speed is high, which can better meet the heat dissipation requirements of the grid-side fuse 51. After passing through the machine-side reactor 900 , the grid-side reactor 901 , and the grid-side fuse 51 , the wind is guided out from the rear of the power cabinet 2000 through the cooling fan, thereby realizing an air-cooling heat dissipation cycle in the lower half of the power cabinet 2000 .
[0042] At the same time, the cooling fans of the upper cooling cycle and the cooling fans of the lower cooling cycle are arranged in the same area, which makes maintenance more convenient; at the same time, the air outlets are also located in the same area, which is convenient for centralized disposal and management of the hot air exported from the power cabinet 2000.
[0043] In addition, the brake resistor 200 is self-cooling and does not require additional heat dissipation, so it is arranged on the top outside of the entire converter without affecting the inside, thereby achieving the optimal design.
[0044] According to the converter of the present invention, the first to third heat dissipation devices are operated separately, and all heat dissipation cycles are fully optimized. According to the requirements of different devices for temperature, wind speed, etc., the optimal requirements of each part are accurately achieved, so that the heat dissipation design effect in the entire converter is optimized.
[0045] The utility model also provides a wind generating set, which comprises the converter according to the utility model.
[0046] According to the inverter of the utility model, due to the more reasonable layout, the volume of the entire inverter is smaller than that of a conventional inverter at the same power level. In the same tower bottom layout of a wind turbine generator set, the inverter and other equipment can be arranged using one platform. Compared with a conventional inverter, a layer of platform occupied by other equipment is saved, thereby reducing costs.
[0047] According to the converter of the utility model, the internal layout of the converter is more reasonable, the busbars connected on the main circuit are not crossed, the length of the busbars is greatly shortened, and the material cost of the busbars is reduced.
[0048] According to the converter of the utility model, the internal heat dissipation scheme of the converter is better, all devices are in a good heat dissipation environment, the failure rate of the devices is effectively reduced, and the reliability of the converter is improved; in addition, all connecting busbars can achieve good heat dissipation, thereby reducing the cross-section selection of the connecting busbars and reducing the material cost of the busbars.
[0049] According to the converter of the utility model, the layout of the converter is reasonable, so that the volume is smaller at the same power level and the volume power density is improved, so that the converter and other equipment in the wind turbine generator set are placed on the same platform, which reduces the number of platforms and reduces costs.
[0050] Although the exemplary embodiments of the present invention have been described in detail above, those skilled in the art should understand that various modifications and variations can be made to the embodiments of the present invention without departing from the principles and spirit of the present invention. However, it should be understood that, in the opinion of those skilled in the art, these modifications and variations will still fall within the scope of the present invention as defined by the claims.
Claims
1. A converter, characterized in that: The converter comprises a grid-connected cabinet (1000) and a power cabinet (2000) arranged side by side, wherein the grid-connected cabinet (1000) comprises a grid-side filter capacitor pool (30), a stator contactor (40), a grid-side circuit breaker (50), and a stator connection busbar (41) located above the stator contactor (40); and the power cabinet (2000) comprises a capacitor pool (300), a power module (400), a grid-side fuse (51), a machine-side reactor (900), and a grid-side reactor (901).
2. The converter according to claim 1, characterized in that: The number of the grid-side circuit breakers (50) is the same as the number of the stator contactors (40), and the grid-side circuit breakers (50) are located below the stator contactors (40).
3. The converter according to claim 2, characterized in that: The grid-side fuse (51) is located on a connection path between the power module (400) and the grid-side reactor (901).
4. The converter according to claim 2, characterized in that: The capacitor pool (300) is located above the power module (400) and is connected to the power module (400) via a stacked busbar.
5. The converter according to any one of claims 1 to 4, characterized in that: The converter further comprises a braking module (800) located on the side of the machine-side reactor (900), and a battery pack (100) and a braking resistor (200) located on the top of the power cabinet (2000).
6. The converter according to claim 1, characterized in that: The number of the power modules (400) is 3, 6 or 9.
7. The converter according to claim 5, characterized in that The grid-connected cabinet (1000) further comprises a first heat dissipation device (10) located above the stator contactor (40).
8. The converter according to claim 5, characterized in that: The power cabinet (2000) further comprises a second heat dissipation device (600) located between the power module (400) and the grid-side fuse (51).
9. The converter according to claim 8, characterized in that The power cabinet (2000) further comprises a third heat dissipation device (700) located between the second heat dissipation device (600) and the grid-side fuse (51).
10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a converter according to any one of claims 1-9.