CN207353840U - Braking system and wind power generating set - Google Patents
Braking system and wind power generating set Download PDFInfo
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- CN207353840U CN207353840U CN201721458237.XU CN201721458237U CN207353840U CN 207353840 U CN207353840 U CN 207353840U CN 201721458237 U CN201721458237 U CN 201721458237U CN 207353840 U CN207353840 U CN 207353840U
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- 230000005611 electricity Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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Abstract
The utility model embodiment provides a kind of braking system and wind power generating set.Braking system includes：Bus capacitor, braking resistor and the brake unit being arranged between positive direct-current busbar and negative dc bus, wherein, brake unit includes multiple braking subelements of series connection, and each subelement of braking includes a diode and the resistance with the diodes in parallel；Braking resistor is connected with brake unit；Bus capacitor and the braking resistor and brake unit connected are in parallel.The braking system and wind power generating set of the utility model embodiment, simple in structure, cost is relatively low, and easy to maintain.
Description
Technical field
Technical field of wind power generation is the utility model is related to, more particularly to a kind of braking system and wind power generating set.
Background technology
Braking system is the important component of wind power generating set.Its main function is to suppress DC bus-bar voltage, protect
Device in shield wind power generating set Variable flow control cabinet is not damaged by high pressure.
Current braking system mainly includes：Voltage detection device, brake monitor, brake unit and braking resistor.Electricity
Pressure detection device detects the voltage of dc bus in real time, starts voltage when the voltage for detecting dc bus exceedes brake unit
When, triggering brake monitor control brake unit, makes current flow through braking resistor.Braking resistor consumed energy, makes dc bus
Voltage reduce.
But existing brake system structure is more complicated, cost is higher, and the trouble point that may be broken down is more,
Maintenance difficulties are big.
Utility model content
The utility model embodiment provides a kind of braking system and wind power generating set, and simple in structure, cost is relatively low, and
It is easy to maintain.
On the one hand, the utility model embodiment provides a kind of braking system, including：It is arranged at positive direct-current busbar and negative direct current
Bus capacitor, braking resistor and brake unit between busbar, wherein,
Brake unit includes multiple braking subelements of series connection, it is each brake subelement include a diode and with this two
The resistance of pole pipe parallel connection；
Braking resistor is connected with brake unit；
Bus capacitor and the braking resistor and brake unit connected are in parallel.
In one embodiment of the utility model, each subelement of braking includes the two or more of a resistance or series connection
Resistance.
In one embodiment of the utility model, each two or more resistance for braking the series connection that subelement includes, two
The resistance value of a above resistance is identical.
In one embodiment of the utility model, the conducting voltage for the diode that each braking subelement includes is identical.
In one embodiment of the utility model, the sum of each resistance value of resistance braked subelement and included is equal.
In one embodiment of the utility model, brake subelement quantity and diode conducting voltage it is inversely proportional
Relation.
In one embodiment of the utility model, the resistance value of braking resistor is less than 1 ohm.
In one embodiment of the utility model, the sum of resistance value of resistance that multiple braking subelements include is at least
100 times of the resistance value of braking resistor.
On the other hand, the utility model embodiment provides a kind of wind power generating set, including any one above-mentioned braking system
System.
The braking system and wind power generating set of the utility model embodiment, simple in structure, cost is relatively low, and is easy to tie up
Shield.
Brief description of the drawings
The feature of the utility model exemplary embodiment, advantage and technique effect described below with reference to the accompanying drawings.
Fig. 1 shows the first structure diagram for the braking system that the utility model embodiment provides；
Fig. 2 shows second of structure diagram of the braking system that the utility model embodiment provides；
Fig. 3 shows the structure diagram for the wind power generating set that the utility model embodiment provides.
Embodiment
The embodiment of the utility model is described in further detail with reference to the accompanying drawings and examples.Following embodiments
The detailed description and the accompanying drawings be used to exemplarily illustrate the principle of the utility model, but cannot be used for limiting the model of the utility model
Enclose, i.e., the utility model is not limited to described embodiment.
, it is necessary to explanation in the description of the utility model, term " on ", " under ", " interior ", " outer ", " bottom ", " push up
The orientation or position relationship of the instructions such as end " are based on orientation shown in the drawings or position relationship, are for only for ease of and describe this reality
With new and simplify description, rather than instruction or imply that signified device or element there must be specific orientation, with specific
Azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " first ", " second " etc. are only used
In description purpose, and it is not intended that instruction or hint relative importance.In the description of the utility model, it is also necessary to explanation
It is that unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be
It is fixedly connected or is detachably connected, or is integrally connected；It can be directly connected, can also be by between intermediary
Connect connected.For the ordinary skill in the art, visual concrete condition understands above-mentioned term in the utility model
Concrete meaning.
The utility model embodiment provides a kind of braking system.As shown in Figure 1, Fig. 1 shows the utility model embodiment
The first structure diagram of the braking system of offer.
The braking system can include：Bus capacitor, the braking electricity being arranged between positive direct-current busbar and negative dc bus
Resistance and brake unit.
Wherein, brake unit includes multiple braking subelements of series connection, it is each brake subelement include a diode and
With the resistance of the diodes in parallel；Braking resistor is connected with brake unit；Bus capacitor and the braking resistor connected and braking are single
It is first in parallel.
When the diode current flow for each braking subelement that brake unit includes, positive direct-current busbar and negative dc bus it
Between voltage be applied directly in braking resistor, braking resistor consumed energy, makes between positive direct-current busbar and negative dc bus electric
Pressure drop is low.
The braking system of the utility model embodiment, simple in structure, cost is relatively low, and easy to maintain
Include three braking subelements of series connection with brake unit below, three braking subelements are respectively the first braking
Unit, the second braking subelement and the 3rd braking subelement；First braking subelement includes a diode and a resistance；The
Two braking subelements include a diode and two resistance；3rd braking subelement includes a diode and three resistance are
Example illustrates.
As shown in Figure 2.Fig. 2 shows second of structure diagram of the braking system that the utility model embodiment provides.
Bus capacitor C is arranged between positive direct-current busbar and negative dc bus.
Braking resistor R connects with brake unit 1.
Bus capacitor C and the braking resistor R and brake unit 1 that connect are in parallel.
Brake unit 1 includes three braking subelements of series connection, and three braking subelements are respectively the first braking subelement
11st, the second braking subelement 12 and the 3rd brakes subelement 13.Wherein, the first braking subelement 11 includes diode D1 and resistance
R1；Second braking subelement 12 includes diode D2, resistance R2 and resistance R3；3rd braking subelement 13 include diode D3,
Resistance R4, resistance R5 and resistance R6.
Diode D1 and resistance R1 is in parallel.
Resistance R2 and resistance R3 series connection, diode D2 are in parallel with the resistance R2 and resistance R3 that are cascaded.
Resistance R4, resistance R5 and tri- resistance series connection of resistance R6, diode D3 and the resistance R4, the resistance R5 that are cascaded
It is in parallel with resistance R6.
That is, braking subelement can include a resistance, for example the first braking subelement 11 includes a resistance
R1；The two or more resistance of series connection can also be included by braking subelement, for example the second braking subelement 12 includes two of series connection
Resistance R2 and R3, the 3rd braking subelement 13 include three resistance R4, R5 and R6 of series connection.
It is above-mentioned second braking subelement 12 connect two resistance R2 and R3 resistance value can it is identical can not also be identical,
3rd braking subelement 13 include series connection three resistance R4, R5 and R6 resistance value can it is identical can not also be identical.
In order to facilitate the type selecting of resistance, the identical resistance of resistance value can be chosen, i.e. the resistance value of R2 and R3 is identical, R4,
The resistance value of R5 and R6 is also identical.
The conducting voltage of above-mentioned diode D1, D2 and D3 can it is identical can not also be identical.
, it is necessary to ensure diode D1 parallel connections in the case of the conducting voltage of above-mentioned diode D1, D2 and D3 are different
The voltage that resistance R1 is got is more than the conducting voltage of diode D1, what two resistance R2 and R3 of diode D2 parallel connections were got
The sum of voltage is more than the conducting voltage of diode D2, the voltage that three resistance R4, R5 and R6 of diode D3 parallel connections are got it
With the conducting voltage more than diode D3.
In order to facilitate the type selecting of diode, the identical diode of conducting voltage can be chosen, i.e. diode D1, D2 and D3's
Conducting voltage is identical.
When above-mentioned diode D1, D2 are identical with the conducting voltage of D3, the sum of resistance value of above-mentioned resistance R2 and resistance R3
The sum of resistance value that can be equal to resistance R4, resistance R5 and resistance R6, while the resistance value equal to resistance R1.I.e. each braking
The sum of the resistance value of resistance that unit includes is equal.
In the case where the conducting voltage of diode that each braking subelement includes is identical, brake the quantity of subelement with
The inversely proportional relation of conducting voltage of diode.That is the conducting voltage of diode is bigger, and the quantity for braking the quantity of subelement is got over
It is few.Therefore the larger diode of conducting voltage can be selected, to reduce the number of braking subelement.
Furthermore it is possible to resistance of the resistance value less than 1 ohm is chosen as braking resistor, wherein, the main work of braking resistor
With the energy for being consumption DC circuit, the voltage between positive direct-current busbar and negative dc bus is reduced.
In order to enable braking resistor to realize the function of reducing the voltage between positive direct-current busbar and negative dc bus, it is necessary to protect
100 times that the sum of resistance value of resistance that multiple braking subelements include is at least the resistance value of braking resistor are demonstrate,proved, specifically, more
The sum of resistance value of resistance that a braking subelement includes can be much larger than the resistance value of braking resistor.
In the case where the conducting voltage for the diode that each braking subelement includes is identical, due to multiple braking subelements
Including the sum of the resistance value of resistance be much larger than the resistance value of braking resistor, therefore braking resistor is compared to multiple braking subelements
Including the DC bus-bar voltage got of resistance can be ignored.The voltage at each diode both ends is direct current mother at this time
Line voltage divided by number of diodes, when magnitude of voltage is more than the electric conduction of diode obtained by DC bus-bar voltage divided by number of diodes
During pressure, the diode that each braking subelement includes is both turned on, and the voltage between positive direct-current busbar and negative dc bus is straight at this time
Connect and be applied in braking resistor, braking resistor consumed energy, reduces voltage between positive direct-current busbar and negative dc bus.
In addition, the other end opposite with one end of the connection of brake unit 1 of braking resistor R can connect with positive direct-current busbar
Connect, can also be connected with negative dc bus.Wherein, Fig. 2 shows that one end connected with brake unit 1 of braking resistor R is opposite
Other end situation about being connected with positive direct-current busbar.
It should be noted that above-mentioned three braking subelements for including series connection with brake unit, three braking subelements point
Wei not the first braking subelement, the second braking subelement and the 3rd braking subelement；First braking subelement includes two poles
Pipe and a resistance；Second braking subelement includes a diode and two resistance；3rd braking subelement includes one two
Illustrated exemplified by pole pipe and three resistance, be only an instantiation of the utility model, do not form to the utility model
Restriction.
Exemplary, it is assumed that under normal condition, DC bus-bar voltage is 500 volts, and in order to protect device, setting is female when direct current
Line voltage needs to carry out discharge to the electric energy of dc bus when being higher than 520 volts, reduces DC bus-bar voltage.The resistance of braking resistor
It is worth for 0.5 ohm, setting each braking subelement includes a diode and one and the resistance of the diodes in parallel.
Assuming that choosing the diode that conducting voltage is 0.5 volt, selection and the resistance value of the resistance of diodes in parallel are
1000 ohm, then need to choose 520 volts/0.5 volt=1040 1000 ohm of resistance at this time.
When 1000 ohm of resistance lazy weight 1040, for example current 1000 ohm of resistance only has 1039, at this time
Two 500 ohm of resistance can be chosen to connect, or choose one 100 ohm and one 900 ohm of two resistance strings
Connection, or choose 10 100 ohm of resistance and connect etc..
Assuming that if the conducting voltage chosen is 0.8 volt of diode, only need to choose 520 volts/0.8 volt=650 at this time
A 1000 ohm of resistance.
The utility model embodiment also provides a kind of wind power generating set, including any one above-mentioned braking system.
As shown in figure 3, Fig. 3 shows the structure diagram for the wind power generating set that the utility model embodiment provides.
Wherein, the blade of wind power generating set is connected with generator, and generator is connected with rectifier, braking system respectively with
Rectifier is connected with inverter, and inverter is connected with power grid.
Specifically, three outputs of generator and three inputs of rectifier connect；Positive direct-current busbar and rectifier are just
Pole output terminal connection, the cathode output end for bearing dc bus and rectifier connect；And the cathode of positive direct-current busbar and inverter
Input terminal connects；The negative input of negative dc bus and inverter connects；Three of three of inverter outputs and power grid are defeated
Enter connection.
Although the present utility model has been described by reference to the preferred embodiments, but the model of the utility model is not being departed from
In the case of enclosing, various improvement can be carried out to it and component therein can be replaced with equivalent.Especially, as long as not depositing
In structural conflict, items technical characteristic mentioned in the various embodiments can be combined in any way.The utility model
It is not limited to specific embodiment disclosed herein, but all technical solutions including falling within the scope of the appended claims.
Claims (9)
- A kind of 1. braking system, it is characterised in that including：The busbar electricity being arranged between positive direct-current busbar and negative dc bus Appearance, braking resistor and brake unit, wherein,The brake unit includes multiple braking subelements of series connection, it is each brake subelement include a diode and with this two The resistance of pole pipe parallel connection；The braking resistor is connected with the brake unit；The bus capacitor and the braking resistor connected and the brake unit are in parallel.
- 2. braking system according to claim 1, it is characterised in that each braking subelement include a resistance or The two or more resistance of series connection.
- 3. braking system according to claim 2, it is characterised in that each braking subelement includes two of series connection Above resistance, the resistance value of described two above resistance are identical.
- 4. braking system according to claim 1, it is characterised in that the diode that each braking subelement includes Conducting voltage is identical.
- 5. braking system according to claim 4, it is characterised in that the electricity for the resistance that each braking subelement includes The sum of resistance value is equal.
- 6. braking system according to claim 4, it is characterised in that the quantity of the braking subelement and the diode The inversely proportional relation of conducting voltage.
- 7. braking system according to claim 1, it is characterised in that the resistance value of the braking resistor is less than 1 ohm.
- 8. braking system according to claim 7, it is characterised in that the electricity for the resistance that the multiple braking subelement includes The sum of resistance value is at least 100 times of the resistance value of the braking resistor.
- 9. a kind of wind power generating set, it is characterised in that including claim 1 to 8 any one of them braking system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721458237.XU CN207353840U (en) | 2017-11-03 | 2017-11-03 | Braking system and wind power generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721458237.XU CN207353840U (en) | 2017-11-03 | 2017-11-03 | Braking system and wind power generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207353840U true CN207353840U (en) | 2018-05-11 |
Family
ID=62354445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721458237.XU Active CN207353840U (en) | 2017-11-03 | 2017-11-03 | Braking system and wind power generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207353840U (en) |
-
2017
- 2017-11-03 CN CN201721458237.XU patent/CN207353840U/en active Active
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