CN208797573U - A kind of chopper and generating set grid-connected system - Google Patents
A kind of chopper and generating set grid-connected system Download PDFInfo
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- CN208797573U CN208797573U CN201821386772.3U CN201821386772U CN208797573U CN 208797573 U CN208797573 U CN 208797573U CN 201821386772 U CN201821386772 U CN 201821386772U CN 208797573 U CN208797573 U CN 208797573U
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- switching circuit
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- frequency converter
- current transformer
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Abstract
The utility model provides a kind of chopper and generating set grid-connected system, wherein chopper is connected between current transformer/frequency converter positive bus-bar and negative busbar, it includes switching circuit, first lets out energy resistance R1 and absorbing circuit, the switching circuit includes DC side positive terminal, DC side negative terminal with exchange survey output terminal, the DC side positive terminal of the switching circuit is connected with current transformer/frequency converter positive bus-bar, the DC side negative terminal of the switching circuit is connected with current transformer/frequency converter negative busbar, the exchange of the switching circuit surveys output terminal and is connected with the DC side positive terminal of the switching circuit, the absorbing circuit is connected between the DC side positive terminal of the switching circuit and DC side negative terminal, described first lets out the DC side positive terminal that energy resistance R1 is connected on the switching circuit , on the circuit that is formed of DC side negative terminal and current transformer/frequency converter positive bus-bar, negative busbar.The chopper of the utility model can prevent switching circuit, and there are over-voltage risks.
Description
Technical field
The utility model relates to wind power generating set field more particularly to a kind of choppers and generating set grid-connected system.
Background technique
In recent years, national grid requires wind power generating set that must have false voltage ride-through capability, and part of the manufacturer is even
The demand that no-voltage is passed through is proposed, false voltage passes through in order to prevent or no-voltage passes through period or other power network fluctuations
There is overpressure situation in period busbar voltage, needs to increase chopper in current transformer/frequency convertor system.
Currently, more common chopper is as shown in Figure 1, including switching circuit (Q1), letting out energy resistance (R1) and absorb electricity
Road (C1) composition.In circuit as shown in the figure, general chopper and current transformer/frequency converter DC side bus capacitor have a spacing
From the two is connected by lead or copper bar, there is parasitic inductance (L1)；The exchange side of switching circuit (Q1) is let out can resistance (R1)
It is connected with current transformer/frequency converter positive bus-bar by cable or copper bar.Due to the presence of parasitic inductance (L1), in chopper switches
When circuit (Q1) turns off, it will form peak voltage, especially high current between the positive and negative terminal of switching circuit (Q1) and turn off situation
Under, switching circuit (Q1) may over-voltage failure；Switching circuit (Q1) failure will lead to current transformer/frequency converter (or frequency converter)
Positive and negative busbar short-circuit, the damage for further resulting in other devices around bus cause bigger loss.
Utility model content
The purpose of the utility model is to provide a kind of chopper and generating set grid-connected systems, to solve the hair of the prior art
Parasitic inductance and absorbing circuit, which are formed, when switching circuit turns off in the chopper of motor group grid-connected system shakes, and leads to switching circuit
There is technical issues that over-voltage.
The utility model is to solve technical solution used by its technical problem:
A kind of chopper is connected between current transformer/frequency converter positive bus-bar and negative busbar comprising switching circuit,
First let out can resistance R1 and absorbing circuit, the switching circuit include DC side positive terminal, DC side negative terminal and exchange
Output terminal is surveyed, the DC side positive terminal of the switching circuit is connected with current transformer/frequency converter positive bus-bar, the switch
The DC side negative terminal of circuit is connected with current transformer/frequency converter negative busbar, and output end is surveyed in the exchange of the switching circuit
Sub to be connected with the DC side positive terminal of the switching circuit, the absorbing circuit is connected to the DC side of the switching circuit
Between positive terminal and DC side negative terminal, described first lets out the DC side anode that energy resistance R1 is connected on the switching circuit
On the circuit that terminal, DC side negative terminal and current transformer/frequency converter positive bus-bar, negative busbar are formed.
Further, described first the DC side positive terminal and unsteady flow that energy resistance R1 is series at the switching circuit are let out
Between device/frequency converter positive bus-bar.
Further, described first the DC side negative terminal and unsteady flow that energy resistance R1 is series at the switching circuit are let out
Between device/frequency converter negative busbar.
Further, the chopper further include second let out can resistance R2, the exchange of the switching circuit surveys output terminal
Energy resistance R2 is let out by described second to be connected with the DC side positive terminal of the switching circuit.
Further, the switching circuit includes switching tube Q1 and sustained diode 1, the collector of switching tube Q1 and continuous
The anode of stream diode D1 is connected, and the DC side positive terminal of the switching circuit is the cathode of diode D1, the switch
The DC side negative terminal of circuit is the emitter of switching tube Q1, and the sun that terminal is diode D1 is surveyed in the exchange of the switching circuit
Pole.
Further, the switching circuit include the first IGBT pipe Q1, the 2nd IGBT pipe Q2, the first sustained diode 1,
Second sustained diode 2, the first sustained diode 1 are connected between the emitter and collector of the first IGBT pipe Q1, and second
Sustained diode 2 is connected between the emitter and collector of the 2nd IGBT pipe Q2, the collector and second of the first IGBT pipe Q1
The emitter of IGBT pipe Q2 is connected, and the DC side positive terminal of the switching circuit is the collector of the 2nd IGBT pipe Q2, institute
The DC side negative terminal for stating switching circuit is the emitter of the first IGBT pipe Q1, and output terminal is surveyed in the exchange of the switching circuit
For the collector of the first IGBT pipe Q1.
Further, the absorbing circuit includes Absorption Capacitance C1, and the Absorption Capacitance C1 is in parallel with the switching circuit.
Further, the absorbing circuit includes resistance R3 and Absorption Capacitance C1, and resistance R3 connects with Absorption Capacitance C1.
Further, the absorbing circuit includes diode D3 and Absorption Capacitance C1, and diode D3 and Absorption Capacitance C1 go here and there
Connection.
Further, the absorbing circuit includes diode D3, resistance R3 and Absorption Capacitance C1, diode D3, resistance
R3 is sequentially connected in series with Absorption Capacitance C1.
Further, the utility model also provides a kind of generating set grid-connected system comprising current transformer/frequency converter and company
The chopper being connected between the positive bus-bar and negative busbar of the current transformer/frequency converter, the chopper use above-mentioned chopper.
Compared with prior art, DC side positive terminal, straight of the chopper of the utility model in the switching circuit
Stream side negative terminal and current transformer/frequency converter positive bus-bar, negative busbar formed circuit on connected first let out can resistance R1, can
Effectively to inhibit because of the parasitism of cable or copper bar that chopper is connected with the bus of current transformer/frequency converter (either frequency converter)
The oscillation peak voltage generated between inductance L1 and absorbing circuit reduces switching circuit over-voltage risk；In addition, first lets out energy electricity
Resistance R1 can also be reduced under chopper switches circuit damage short-circuit conditions, the short circuit electricity between the positive and negative bus of current transformer/frequency converter
Stream reduces the risk of other device failures around busbar.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the chopper of the prior art.
Fig. 2 is the circuit diagram of the chopper of the utility model embodiment one.
Fig. 3 is the circuit diagram of the chopper of the utility model embodiment two.
Fig. 4 is the circuit diagram of the chopper of the utility model embodiment three.
Fig. 5 is the circuit diagram of the chopper of the utility model embodiment four.
Fig. 6 is the circuit diagram of the chopper of the utility model embodiment five.
Fig. 7 is the circuit diagram of the chopper of the utility model embodiment six.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in Fig. 2, a kind of chopper that the utility model embodiment one provides, is connected to current transformer/frequency converter
Between positive bus-bar and negative busbar comprising switching circuit, first let out energy resistance R1 and absorbing circuit, and the switching circuit includes straight
Stream side positive terminal P, DC side negative terminal N with exchange survey output terminal A, the DC side positive terminal P of the switching circuit
It is connected with current transformer/frequency converter positive bus-bar, the DC side negative terminal and current transformer/frequency converter of the switching circuit are negative
Bus is connected, and the exchange of the switching circuit surveys output terminal A and is connected with the DC side positive terminal P of the switching circuit
It connects, the absorbing circuit is connected between the DC side positive terminal P of the switching circuit and DC side negative terminal N, described
First lets out DC side positive terminal P, DC side negative terminal N and the current transformer/change that energy resistance R1 is connected on the switching circuit
On the circuit that the positive bus-bar of frequency device, negative busbar are formed.
Described first lets out the DC side positive terminal P and current transformer/frequency converter that energy resistance R1 is series at the switching circuit
Positive bus-bar between.Further, described first the DC side cathode that energy resistance R1 can also be series at the switching circuit is let out
Between terminal N and current transformer/frequency converter negative busbar.
The switching circuit includes the first IGBT pipe Q1, the 2nd IGBT pipe Q2, the first sustained diode 1, the second afterflow two
Pole pipe D2, the first sustained diode 1 are connected between the emitter and collector of the first IGBT pipe Q1, the second freewheeling diode
D2 is connected between the emitter and collector of the 2nd IGBT pipe Q2, the collector of the first IGBT pipe Q1 and the 2nd IGBT pipe Q2's
Emitter is connected, and the DC side positive terminal P of the switching circuit is the collector of the 2nd IGBT pipe Q2, the switching circuit
DC side negative terminal N be the first IGBT pipe Q1 emitter, it is first that output terminal A is surveyed in the exchange of the switching circuit
The collector of IGBT pipe Q1.The absorbing circuit includes Absorption Capacitance C1, and the Absorption Capacitance C1 is in parallel with the switching circuit.
Fig. 3 is the circuit diagram for the chopper that the utility model embodiment two provides, compared with embodiment one, embodiment two
In, the chopper further include second let out can resistance R2, second let out can resistance R2 be connected to the switching circuit exchange survey it is defeated
Out between terminal A and the DC side positive terminal P of the switching circuit.
Fig. 4 is the circuit diagram for the chopper that the utility model embodiment three provides, compared with embodiment two, the switch electricity
Road includes switching tube Q1 and sustained diode 1, and the collector of switching tube Q1 is connected with the anode of sustained diode 1, described
The DC side positive terminal P of switching circuit is the cathode of diode D1, and the DC side negative terminal N of the switching circuit is switch
The anode that terminal is diode D1 is surveyed in the emitter of pipe Q1, the exchange of the switching circuit.
Fig. 5 is the circuit diagram for the chopper that the utility model embodiment four provides, compared with embodiment one, the absorption electricity
Road includes resistance R3 and Absorption Capacitance C1, and resistance R3 connects with Absorption Capacitance C1.
Fig. 6 is the circuit diagram for the chopper that the utility model embodiment five provides, compared with embodiment one, the absorption electricity
Road includes diode D3 and Absorption Capacitance C1, and diode D3 connects with Absorption Capacitance C1.
Fig. 7 is the circuit diagram for the chopper that the utility model embodiment six provides, compared with example IV and embodiment five,
The absorbing circuit includes diode D3, resistance R3 and Absorption Capacitance C1, and diode D3, resistance R3 and Absorption Capacitance C1 are successively
Series connection.
Further, the utility model also provides a kind of generating set grid-connected system comprising current transformer/frequency converter and company
The chopper being connected between the positive bus-bar and negative busbar of the current transformer/frequency converter, the chopper use above-mentioned chopper.
In conclusion DC side positive terminal, DC side cathode of the chopper of the utility model in the switching circuit
Connected on the circuit that terminal and current transformer/frequency converter positive bus-bar, negative busbar are formed first let out can resistance R1, can effectively press down
System is because between the parasitic inductance L1 and absorbing circuit of cable or copper bar that chopper is connected with current transformer/frequency converter bus
The oscillation peak voltage of generation reduces switching circuit over-voltage risk；In addition, first let out can resistance R1 can also reduce chopper
Switching circuit damages under short-circuit conditions, the short circuit current between the positive and negative bus of current transformer/frequency converter, reduces other devices around busbar
The risk of part damage.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (11)
1. a kind of chopper is connected between current transformer/frequency converter positive bus-bar and negative busbar, it is characterised in that: including opening
Powered-down road, first let out can resistance R1 and absorbing circuit, the switching circuit include DC side positive terminal, DC side negative terminal
Output terminal is surveyed with exchanging, the DC side positive terminal of the switching circuit is connected with current transformer/frequency converter positive bus-bar, institute
The DC side negative terminal for stating switching circuit is connected with current transformer/frequency converter negative busbar, and the exchange of the switching circuit is surveyed
Output terminal is connected with the DC side positive terminal of the switching circuit, and the absorbing circuit is connected to the switching circuit
Between DC side positive terminal and DC side negative terminal, described first lets out the direct current that energy resistance R1 is connected on the switching circuit
On the circuit that side positive terminal, DC side negative terminal and current transformer/frequency converter positive bus-bar, negative busbar are formed.
2. chopper according to claim 1, it is characterised in that: described first, which lets out energy resistance R1, is series at the switch electricity
Between the DC side positive terminal and current transformer/frequency converter positive bus-bar on road.
3. chopper according to claim 1, it is characterised in that: described first, which lets out energy resistance R1, is series at the switch electricity
Between the DC side negative terminal and current transformer/frequency converter negative busbar on road.
4. chopper according to claim 1, it is characterised in that: further include second let out can resistance R2, the switching circuit
Exchange survey output terminal by described second let out can resistance R2 be connected with the DC side positive terminal of the switching circuit.
5. chopper according to claim 1, it is characterised in that: the switching circuit includes switching tube Q1 and afterflow two
The collector of pole pipe D1, switching tube Q1 are connected with the anode of sustained diode 1, the DC side positive terminal of the switching circuit
Son is the cathode of diode D1, and the DC side negative terminal of the switching circuit is the emitter of switching tube Q1, the switch electricity
The anode that terminal is diode D1 is surveyed in the exchange on road.
6. chopper according to claim 1, it is characterised in that: the switching circuit includes the first IGBT pipe Q1, second
IGBT pipe Q2, the first sustained diode 1, the second sustained diode 2, the first sustained diode 1 are connected to the first IGBT pipe Q1
Emitter and collector between, the second sustained diode 2 is connected between the emitter and collector of the 2nd IGBT pipe Q2,
The collector of first IGBT pipe Q1 and the emitter of the 2nd IGBT pipe Q2 are connected, the DC side positive terminal of the switching circuit
For the collector of the 2nd IGBT pipe Q2, the DC side negative terminal of the switching circuit is the emitter of the first IGBT pipe Q1, institute
The collector that output terminal is the first IGBT pipe Q1 is surveyed in the exchange for stating switching circuit.
7. chopper according to claim 1, it is characterised in that: the absorbing circuit includes Absorption Capacitance C1, the suction
It is in parallel with the switching circuit to receive capacitor C1.
8. chopper according to claim 1, it is characterised in that: the absorbing circuit includes resistance R3 and Absorption Capacitance
C1, resistance R3 connect with Absorption Capacitance C1.
9. chopper according to claim 1, it is characterised in that: the absorbing circuit includes diode D3 and Absorption Capacitance
C1, diode D3 are sequentially connected in series with Absorption Capacitance C1.
10. chopper according to claim 1, it is characterised in that: the absorbing circuit include diode D3, resistance R3 with
And Absorption Capacitance C1, diode D3, resistance R3 and Absorption Capacitance C1 are sequentially connected in series.
11. a kind of generating set grid-connected system comprising current transformer/frequency converter and be connected to the current transformer/frequency converter just
Chopper between bus and negative busbar, which is characterized in that the chopper is used as claim 1-10 is described in any item
Chopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386772.3U CN208797573U (en) | 2018-08-27 | 2018-08-27 | A kind of chopper and generating set grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821386772.3U CN208797573U (en) | 2018-08-27 | 2018-08-27 | A kind of chopper and generating set grid-connected system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208797573U true CN208797573U (en) | 2019-04-26 |
Family
ID=66207203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821386772.3U Active CN208797573U (en) | 2018-08-27 | 2018-08-27 | A kind of chopper and generating set grid-connected system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208797573U (en) |
-
2018
- 2018-08-27 CN CN201821386772.3U patent/CN208797573U/en active Active
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