CN102496921A - Intelligent protection device for doubly-fed converter - Google Patents
Intelligent protection device for doubly-fed converter Download PDFInfo
- Publication number
- CN102496921A CN102496921A CN2011104598504A CN201110459850A CN102496921A CN 102496921 A CN102496921 A CN 102496921A CN 2011104598504 A CN2011104598504 A CN 2011104598504A CN 201110459850 A CN201110459850 A CN 201110459850A CN 102496921 A CN102496921 A CN 102496921A
- Authority
- CN
- China
- Prior art keywords
- thyristor
- circuit
- current transformer
- absorbs
- power consumption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an intelligent protection device for a doubly-fed converter. The intelligent protection device comprises fan blades, a doubly-fed motor and the converter. The converter comprises a converter grid side and a converter rotor side. The fan blades are connected with a rotating shaft of the doubly-fed motor through a gear box. A stator of the doubly-fed motor is connected to a power grid together with the converter grid side through a switch. The rotor alternating current output of the doubly-fed motor is connected to the converter rotor side. Direct current buses on the converter grid side and the converter rotor side are connected in series. The intelligent protection device further comprises a direct current Crowbar protection circuit and an alternating current Crowbar protection circuit, wherein the direct current Crowbar protection circuit is bridged between the direct current buses; and the alternating current Crowbar protection circuit is bypassed on an alternating current output line from the converter rotor side to the rotor side of the doubly-fed motor, and comprises an absorption circuit, a thyristor circuit and an energy-using resistive circuit. The alternating current Crowbar protection circuit with an optimized structure comprises a few components, and is easy to control and implement, high in reliability and low in cost.
Description
Technical field
The present invention relates to the protective device of double-feed current transformer, more particularly, suppress the double-feed current transformer intelligent protection device of overvoltage and overcurrent when relating to a kind of electric network fault.
Background technology
Along with the lifting of wind-powered electricity generation capacity share in national generate output, wind-powered electricity generation strengthens the influence of whole electrical network day by day, and electrical network is more and more stricter to the requirement of wind-electricity integration.In this case, wind power equipment seems particularly important to the adaptability of electrical network, adapts to the various requirement of different electrical networks, provide timely reliable protection be current wind-powered electricity generation enterprise must in the face of and problem demanding prompt solution.Electrical network transient fault, motor stator side can produce in short-term the electrical network sudden change, the motor stator side through coupling again can with current transformer that rotor-side links to each other on instantaneous big electric current and the high voltage of generation, current transformer is caused damage.Therefore current transformer all has special protective device usually, and way commonly used at present is to absorb energy in rotor-side through shunting device, eliminates the harm of overvoltage and overcurrent.
Improve constantly along with what be incorporated into the power networks and require, the instantaneous electric network fault not requirement of off-grid lets motor produce more major break down electric current, voltage.Therefore need further to improve the adaptive capacity of current transformer, improve the protective device reliability, make it possible to protection current transformer when instantaneous electric network fault, current transformer normally moves behind the power system restoration.
In wind power system; Current transformer is to be used for controlling motor to make the frequency amplitude phase place and the electrical network of output of motor stator be consistent; Can be transported on the electrical network thereby make wind produce the ground energy, current transformer makes under different wind through tracing motor rotation speed; Motor can reach the maximum using to wind energy to the electrical network conveying capacity.Current transformer promptly is a control unit, also is the energy channel of rotor, be vitals in the wind power system, so its reliability is most important.
At present, in wind electric converter, being used for transient protective has and exchanges Crowbar protective circuit, direct current Crowbar protective circuit, interchange+direct current Crowbar protective circuit etc.For direct current Crowbar protective circuit, main effect is to suppress overvoltage, and rush of current is relatively little, and general IGBT (insulated gate bipolar pipe transistor) device all can meet the demands.For exchanging the Crowbar protective circuit, main effect is to suppress overcurrent, and the impulse current during fault receives the fault order of severity of electrical network, the influence of the inner parameter of different motors etc., and the size of impulse current, the duration all alters a great deal.The conveyance capacity of AC side Crowbar protective circuit is extremely important for error protection.Use many devices at present diode, thyristor, IGBT etc. are arranged.
Its common AC side topology is just like several kinds of forms shown in Fig. 1 ~ 4.For present common topology: the used device of rectifying bridge type topological structure shown in Figure 1 is more, uneconomical; The withstand voltage height that thyristor bears in the mixing bridge type topological structure shown in Figure 2, fragile, and anti-parallel thyristor is not controlled when turn-offing; The used device of thyristor inverse parallel formula topological structure shown in Figure 3 is many, uneconomical; IGBT formula topological structure shown in Figure 4 is limited by device overcurrent, overvoltage capabilities, and cost is higher.
Summary of the invention
To the deficiency of prior art, the object of the invention is intended to provide the intelligent protection device of the double-feed current transformer that a kind of device is few, cost is low, the simple and reliable property of control is high.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of intelligent protection device of double-feed current transformer; Comprise fan blade, double feedback electric engine, current transformer; Said current transformer comprises current transformer net side and current transformer rotor-side, and fan blade links to each other with the rotating shaft of double feedback electric engine through gear box, and the stator of double feedback electric engine is connected on the electrical network through switch and current transformer net side together; The rotor of double feedback electric engine is connected to the current transformer rotor-side through exchanging output line; The dc bus of current transformer net side and current transformer rotor-side joins, and it is characterized in that, the intelligent protection device of double-feed current transformer further comprises:
One produces superpotential direct current Crowbar protective circuit when being used to suppress the line voltage fault, and the cross-over connection of said direct current Crowbar protective circuit is between dc bus;
One produces the interchange Crowbar protective circuit of overcurrent when being used to suppress the line voltage fault, and said interchange Crowbar protective circuit is other to be connected on the interchange output line of rotor of current transformer rotor-side to double feedback electric engine;
Said interchange Crowbar protective circuit comprises absorption circuit, thyristor circuit, power consumption resistance circuit; Said thyristor circuit comprises first thyristor, second thyristor, the 3rd thyristor, and said first thyristor, second thyristor, the 3rd thyristor are in turn connected into triangle clockwise or counterclockwise; The power consumption resistance circuit comprises the first power consumption resistance, the second power consumption resistance, the 3rd power consumption resistance; One end of the said first power consumption resistance, the second power consumption resistance, the 3rd power consumption resistance is connected to respectively on the different interchange output lines, and the other end is connected between first thyristor and second thyristor respectively, between second thyristor and the 3rd thyristor, between first thyristor and the 3rd thyristor; Absorb circuit and comprise that first absorbs circuit, the second absorption circuit, the 3rd absorption circuit; Said first absorbs the circuit cross-over connection between the anode and negative electrode of first thyristor; Said second absorbs the circuit cross-over connection between the anode and negative electrode of second thyristor, and the said the 3rd absorbs the circuit cross-over connection between the anode and negative electrode of the 3rd thyristor.
As a kind of execution mode, the said first absorption circuit is the first absorption electric capacity, and the second absorption circuit is the second absorption electric capacity, and the 3rd absorption circuit is the 3rd absorption electric capacity.
As another kind of execution mode, first absorbs circuit comprises that first of series connection absorbs the electric capacity and first resistance, and second absorbs circuit comprises that second of series connection absorbs the electric capacity and second resistance, and the 3rd absorbs circuit comprises that the 3rd of series connection absorbs electric capacity and the 3rd resistance.
As improvement; Direct current Crowbar protective circuit comprises the 4th power consumption resistance, insulated gate bipolar pipe transistor, clamp diode; One is connected on the dc bus positive pole after said the 4th power consumption resistance and the clamp diode parallel connection; The other end is connected to the transistorized collector electrode of insulated gate bipolar pipe, and the transistorized emitter of said insulated gate bipolar pipe is connected on the dc bus negative pole.
The intelligent protection device of a kind of double-feed current transformer that the present invention set forth; Compared with prior art; Its beneficial effect is: the thyristor circuit of interchange Crowbar protective circuit of the present invention adopts delta connection that its structure is optimized; Used device is few, control is simple, be prone to realization, and on reliability and economy, all is much better than topological structure of the prior art.
Description of drawings
Accompanying drawing 1 ~ 4 is the circuit theory diagrams of four kinds of execution modes of prior art;
Accompanying drawing 5 is the circuit theory diagrams of the intelligent protection device embodiment one of a kind of double-feed current transformer of the present invention;
Accompanying drawing 6 is the circuit theory diagrams of the intelligent protection device embodiment two of a kind of double-feed current transformer of the present invention;
Accompanying drawing 7 is the circuit theory diagrams of the intelligent protection device embodiment three of a kind of double-feed current transformer of the present invention;
Accompanying drawing 8 is the circuit theory diagrams of the intelligent protection device embodiment four of a kind of double-feed current transformer of the present invention;
Accompanying drawing 9 is the circuit theory diagrams of the intelligent protection device embodiment five of a kind of double-feed current transformer of the present invention;
Accompanying drawing 10 is the circuit theory diagrams of the intelligent protection device embodiment six of a kind of double-feed current transformer of the present invention;
Accompanying drawing 11 is the control principle figure of direct current Crowbar protective circuit;
Accompanying drawing 12 is for exchanging the control principle figure of Crowbar protective circuit;
Accompanying drawing 13 is the sequential chart of ac bus three-phase voltage among Fig. 7.
Embodiment
Below, in conjunction with accompanying drawing and embodiment, the intelligent protection device of a kind of double-feed current transformer of the present invention done further describing, so that clearerly understand the present invention's technological thought required for protection.
Embodiment one
As shown in Figure 5; A kind of intelligent protection device of double-feed current transformer comprises fan blade 1, double feedback electric engine 22, current transformer, and current transformer comprises current transformer net side 4 and current transformer rotor-side 3; Fan blade 1 links to each other with the rotating shaft of double feedback electric engine through gear box; The stator 21 of double feedback electric engine is connected to electrical network with current transformer net side 4 through switch, and the output line 9 that exchanges of the rotor 22 of double feedback electric engine and current transformer rotor-side 3 is connected, and current transformer rotor-side 3 is connected in series through dc bus 8 with current transformer net side 4.The intelligent protection device of double-feed current transformer further comprises: produce superpotential direct current Crowbar protective circuit 6 when being used to suppress the line voltage fault, 6 cross-over connections of direct current Crowbar protective circuit are between dc bus 8; Produce the interchange Crowbar protective circuit 7 of overcurrent when being used to suppress the line voltage fault, exchange on the interchange output line 9 of the other rotor 22 that connects current transformer rotor-side 3 to double feedback electric engine of Crowbar protective circuit.
Direct current Crowbar protective circuit 6 comprises the 4th power consumption resistance R 1, insulated gate bipolar pipe transistor Q1, clamp diode D1; One is connected on the dc bus positive pole after the 4th power consumption resistance R 1 and the clamp diode D1 parallel connection; The other end is connected to the collector electrode of insulated gate bipolar pipe transistor Q1, and the emitter of insulated gate bipolar pipe transistor Q1 is connected on the dc bus negative pole.
Exchange Crowbar protective circuit 7 and comprise absorption circuit, thyristor circuit, power consumption resistance circuit; Thyristor circuit comprises the first thyristor VT1, the second thyristor VT2, the 3rd thyristor VT3; The first thyristor VT1, the second thyristor VT2, the 3rd thyristor VT3 are in turn connected into triangle clockwise; Promptly be that the first thyristor VT1 is connected between the anode and the 3rd thyristor VT3 negative electrode of the second thyristor VT2; The second thyristor VT2 is connected between the negative electrode and the 3rd thyristor VT3 anode of the first thyristor VT1, and the 3rd thyristor VT3 is connected between the anode and the second thyristor VT2 negative electrode of the first thyristor VT1.The power consumption resistance circuit comprises the first power consumption resistance R 2, the second power consumption resistance R 3, the 3rd power consumption resistance R 4; One end of the first power consumption resistance R 2, the second power consumption resistance R 3, the 3rd power consumption resistance R 4 is connected to respectively on the different interchange output lines 9, and the other end is connected between the first thyristor VT1 and the second thyristor VT2 respectively, between the second thyristor VT2 and the 3rd thyristor VT3, between the first thyristor VT1 and the 3rd thyristor VT3.Absorb circuit and comprise that first absorbs circuit, the second absorption circuit, the 3rd absorption circuit; First absorbs the circuit cross-over connection between the anode and negative electrode of first thyristor; Second absorbs the circuit cross-over connection between the anode and negative electrode of second thyristor, and the 3rd absorbs the circuit cross-over connection between the anode and negative electrode of the 3rd thyristor.In embodiments of the invention one, absorption circuit employing C type absorbs circuit, promptly is that the first absorption circuit, second absorbs circuit and the 3rd absorption circuit adopts the first absorption capacitor C 1, second to absorb capacitor C 2, the 3rd absorption capacitor C 3 respectively.
For exchanging the Crowbar protective circuit, need select the strong device of anti-rush of current ability for use, device capacity enough could guarantee to release the fully rotor-side of double feedback electric engine is responded to the energy of generation.Big capacity electronic device, reliability is extremely important, and these elements account for cost greatly in electronic equipment.Exchanging the optimal device of Crowbar protective circuit is the device that can turn-off; Yet the transient current of the rotor of double feedback electric engine induction is very big with the parameter of electric machine electric network fault degree relation during electric network fault; There is bigger uncertainty in fault current; According to the most serious situation design, need the capacity of device very big.Jumbo insulated gate bipolar pipe transistor cost is high, and insulated gate bipolar pipe transistor itself is responsive to electric current and voltage, so reliability can not be improved at all, adopts the advantage of big capacity thyristor circuit just to display.
The present invention exchanges the employing thyristor circuit mode of Crowbar protective circuit and the difference of other common several kinds of modes:
Existing rectifying bridge type all is to become exchange into direct current earlier with the IGBT formula; Then direct current is controlled; All many for the used device of this mode, cost is high, and the voltage that bears on all devices all is the rotor modulation voltage; Electric current and voltage on the control device is higher relatively, and this needs well to absorb to guarantee that device is in withstand voltage scope.
Existing IGBT formula is controlled fully, and advantage is obvious, but its electric current and voltage that bears is all higher relatively; Need big capacity device; Cost is high, and other modes of protection and control ratio are complicated, and IGBT formula conveyance capacity is much smaller than other devices simultaneously; The large-size machine couple current is very big when electric network fault, so there is shortcoming in this mode.
Mixing bridge type and the used device of thyristor inverse parallel formula are also many, and mixing bridge type, rectifying bridge type are consistent with the voltage that the IGBT formula is born, and for modulation voltage, conveyance capacity have superiority, but overvoltage capabilities is not improved.Thyristor inverse parallel formula is because device series connection, withstand voltagely well improved, and conveyance capacity and mixing bridge type are equal.
Conveyance capacity of the present invention and mixing bridge type, thyristor inverse parallel formula basically identical; A little less than IGBT formula and whole stream bridge-type; Voltage endurance capability of the present invention and IGBT formula, mixing bridge type are consistent, are higher than thyristor inverse parallel formula, and be half the but device reduces; Control circuit obtains simplifying, and function and reliability are also well guaranteed and promote.
Embodiment two
As shown in Figure 6; Embodiment two is with the difference of embodiment one; Absorbing circuit adopts the RC type to absorb circuit; Promptly be first to absorb circuit and absorb capacitor C 1 and 5 cross-over connections of first resistance R between the anode and negative electrode of the first thyristor VT1 for first of series connection, wherein the other end of first resistance R 5 is connected to the negative electrode of the first thyristor VT1, first absorb capacitor C 1 the other end be connected to the anode of the first thyristor VT1; Second absorbs circuit absorbs capacitor C 2 and 6 cross-over connections of second resistance R between the anode and negative electrode of the second thyristor VT2 for second of series connection; Wherein the other end of second resistance R 6 is connected to the negative electrode of the second thyristor VT2, and the other end of the second absorption capacitor C 2 is connected to the anode of the second thyristor VT2; The 3rd absorbs circuit absorbs capacitor C 3 and 7 cross-over connections of the 3rd resistance R between the anode and negative electrode of the 3rd thyristor VT3 for the 3rd of series connection; Wherein the other end of the 3rd resistance R 7 is connected to the negative electrode of the 3rd thyristor VT3, and the other end of the 3rd absorption capacitor C 3 is connected to the anode of the 3rd thyristor VT3.
Embodiment three
As shown in Figure 7, embodiment three and embodiment two all adopt the RC type to absorb circuit, and its difference with embodiment two only is that the electric capacity that is connected in series in each absorption circuit and the position of resistance are changed.
Embodiment four
As shown in Figure 8; Embodiment four is with the difference of embodiment one; The first thyristor VT1, the second thyristor VT2, the 3rd thyristor VT3 are in turn connected into triangle counterclockwise; Promptly be that the first thyristor VT1 is connected between the negative electrode and the 3rd thyristor VT3 anode of the second thyristor VT2, the second thyristor VT2 is connected between the anode and the 3rd thyristor VT3 negative electrode of the first thyristor VT1, and the 3rd thyristor VT3 is connected between the negative electrode and the second thyristor VT2 anode of the first thyristor VT1.
Embodiment five
As shown in Figure 9; Embodiment five is with the difference of embodiment four; Absorbing circuit adopts the RC type to absorb circuit; Promptly be first to absorb circuit and absorb capacitor C 1 and 5 cross-over connections of first resistance R between the anode and negative electrode of the first thyristor VT1 for first of series connection, wherein the other end of first resistance R 5 is connected to the anode of the first thyristor VT1, first absorb capacitor C 1 the other end be connected to the negative electrode of the first thyristor VT1; Second absorbs circuit absorbs capacitor C 2 and 6 cross-over connections of second resistance R between the anode and negative electrode of the second thyristor VT2 for second of series connection; Wherein the other end of second resistance R 6 is connected to the anode of the second thyristor VT2, and the other end of the second absorption capacitor C 2 is connected to the negative electrode of the second thyristor VT2; The 3rd absorbs circuit absorbs capacitor C 3 and 7 cross-over connections of the 3rd resistance R between the anode and negative electrode of the 3rd thyristor VT3 for the 3rd of series connection; Wherein the other end of the 3rd resistance R 7 is connected to the anode of the 3rd thyristor VT3, and the other end of the 3rd absorption capacitor C 3 is connected to the negative electrode of the 3rd thyristor VT3.
Embodiment six
Shown in figure 10, embodiment six and embodiment five all adopt the RC type to absorb circuit, and its difference with embodiment five only is that the electric capacity that is connected in series in each absorption circuit and the position of resistance are changed.
Operation principle: the working method of six kinds of embodiment is basic identical, the sequential chart of its dc bus and electrical network such as Figure 11 and shown in Figure 12.
When current transformer rotor-side 3 and current transformer net side 4 operate as normal, the voltage control of DC bus-bar voltage 8 is at steady state value, and the rotor 22 of current transformer rotor-side 3 control double feedback electric engines makes stator 21 send the frequency of needs, amplitude, the electric current of phase place.Monitor the voltage and the line voltage of dc bus 8 in real time, line voltage is unusual when monitoring, and the voltage of dc bus 8 exceeds sets the protection threshold; When spike appears in the voltage of dc bus 8 shown in figure 11, open the insulated gate bipolar transistor Q1 of direct current Crowbar protective circuit fast, the 4th power consumption resistance R 1 is started working; Make ac bus voltage descend; Suppress rotor induction and press the voltage of the dc bus 8 that causes to rise,, turn-off the insulated gate bipolar transistor Q1 of direct current Crowbar protective circuit when the voltage of dc bus 8 recovers just often; The 4th power consumption resistance R 1 quits work, and system restoration is normal.Clamp diode D1 is used for suppressing insulated gate bipolar transistor Q1 and turn-offs the transient overvoltage that produces.In addition, direct current Crowbar protective circuit choose need according to the capacity of current transformer rotor-side 3 with and the shock-resistant electric current of IGBT module etc. confirm that to guarantee to suppress fast overvoltage, the voltage of keeping dc bus 8 is in controlled range.
When electric network fault, because the double feedback electric engine stator links to each other with electrical network, the sudden change meeting of line voltage causes very big stator current in the motor stator side.Because stator magnetic linkage can not suddenly change, when voltage is undergone mutation, can produce the direct current magnetic linkage at stator, because the close coupling between the stator and rotor, fault current is passed to rotor-side immediately, causes the overvoltage and the overcurrent of rotor loop.Rotor energy is flowed through after the rotor-side converter, can charge to dc capacitor, causes the quick rising of DC bus-bar voltage, and excessive electric current and voltage will cause the damage of current transformer, rotor winding insulation and dc-link capacitance.Processing mode is the electric current of current transformer rotor-side 3 monitoring rotors 22 in native system; Shown in figure 12ly spike occurs and exceed when setting the protection threshold when the monitoring rotor current, promptly when rotor current surpasses the safety value of current transformer, incision interchange Crowbar protective circuit fast; Open and exchange this rotor current of Crowbar protective circuit bypass; Suppress the rush of current current transformer, the protection current transformer avoids overcurrent to be damaged, when electric current reaches safety value through the certain hour decay; Cut out and exchange the Crowbar protective circuit, recover operate as normal.
Exchange the Crowbar protective circuit and adopt triangular form to connect method, every at any time what bear mutually all is the line voltage of inverter output, is example with the embodiment shown in the accompanying drawing 7 three, suppose at zero time trigger signal effectively, and its process is shown in figure 13:
For the first thyristor VT1: can find out from Figure 13 three-phase voltage sequential chart, the first thyristor VT1 conducting during of T phase voltage greater than R phase voltage amplitude, the conducting interval has: 3,4,5; And at 6 interval R greater than the S phase time, the second thyristor VT2 conducting makes the R phase voltage be pulled down to the S phase voltage, the first also conducting of thyristor VT1 this moment, so the total conducting interval of the first thyristor VT1 has: 3,4,5,6, conducting 240 degree i.e. 2/3 cycle.
For the second thyristor VT2: can find out from Figure 13 three-phase voltage sequential chart, the second thyristor VT2 conducting during of R phase voltage greater than S phase voltage amplitude, the conducting interval has: 1,5,6; And at 2 interval S greater than the T phase time, the 3rd thyristor VT3 conducting makes the S phase voltage be pulled down to the T phase voltage, the second also conducting of thyristor VT2 this moment, so the total conducting interval of the second thyristor VT2 has: 1,2,5,6, conducting 240 degree i.e. 2/3 cycle.
For the 3rd thyristor VT3: can find out from Figure 13 three-phase voltage sequential chart, the 3rd thyristor VT3 conducting during of S phase voltage greater than T phase voltage amplitude, the conducting interval has: 1,2,3; And at 4 interval T greater than the R phase time, the first thyristor VT1 conducting makes the T phase voltage be pulled down to the R phase voltage, the 3rd also conducting of thyristor VT3 this moment, so the total conducting interval of the 3rd thyristor VT3 has: 1,2,3,4, conducting 240 degree i.e. 2/3 cycle.
Can find out that to sum up all there are two thyristor conductings any time in the whole cycle, the electric current of any time path of all releasing.
The principle of releasing of other embodiment is similar with it, repeats no more here.
For a person skilled in the art, can make other various corresponding changes and distortion, and these all changes and distortion should belong within the protection range of claim of the present invention all according to the technical scheme and the design of above description.
Claims (4)
1. the intelligent protection device of a double-feed current transformer; Comprise fan blade, double feedback electric engine, current transformer; Said current transformer comprises current transformer net side and current transformer rotor-side, and fan blade links to each other with the rotating shaft of double feedback electric engine through gear box, and the stator of double feedback electric engine is connected on the electrical network through switch and current transformer net side together; The rotor of double feedback electric engine is connected to the current transformer rotor-side through exchanging output line; The dc bus of current transformer net side and current transformer rotor-side joins, and it is characterized in that, the intelligent protection device of double-feed current transformer further comprises:
One produces superpotential direct current Crowbar protective circuit when being used to suppress the line voltage fault, and the cross-over connection of said direct current Crowbar protective circuit is between dc bus;
One produces the interchange Crowbar protective circuit of overcurrent when being used to suppress the line voltage fault, and said interchange Crowbar protective circuit is other to be connected on the interchange output line between the rotor of current transformer rotor-side to double feedback electric engine;
Said interchange Crowbar protective circuit comprises absorption circuit, thyristor circuit, power consumption resistance circuit; Said thyristor circuit comprises first thyristor, second thyristor, the 3rd thyristor, and said first thyristor, second thyristor, the 3rd thyristor are in turn connected into triangle clockwise or counterclockwise; The power consumption resistance circuit comprises the first power consumption resistance, the second power consumption resistance, the 3rd power consumption resistance; One end of the said first power consumption resistance, the second power consumption resistance, the 3rd power consumption resistance is connected to respectively on the different interchange output lines, and the other end is connected between first thyristor and second thyristor respectively, between second thyristor and the 3rd thyristor, between first thyristor and the 3rd thyristor; Absorb circuit and comprise that first absorbs circuit, the second absorption circuit, the 3rd absorption circuit; Said first absorbs the circuit cross-over connection between the anode and negative electrode of first thyristor; Said second absorbs the circuit cross-over connection between the anode and negative electrode of second thyristor, and the said the 3rd absorbs the circuit cross-over connection between the anode and negative electrode of the 3rd thyristor.
2. the intelligent protection device of double-feed current transformer as claimed in claim 1 is characterized in that, the said first absorption circuit is the first absorption electric capacity, and the second absorption circuit is the second absorption electric capacity, and the 3rd absorption circuit is the 3rd absorption electric capacity.
3. the intelligent protection device of double-feed current transformer as claimed in claim 1; It is characterized in that; First absorbs circuit comprises that first of series connection absorbs the electric capacity and first resistance; Second absorbs circuit comprises that second of series connection absorbs the electric capacity and second resistance, and the 3rd absorbs circuit comprises that the 3rd of series connection absorbs electric capacity and the 3rd resistance.
4. like the intelligent protection device of claim 2 or 3 described double-feed current transformers; It is characterized in that; Direct current Crowbar protective circuit comprises the 4th power consumption resistance, insulated gate bipolar pipe transistor, clamp diode; One is connected on the dc bus positive pole after said the 4th power consumption resistance and the clamp diode parallel connection, and the other end is connected to the transistorized collector electrode of insulated gate bipolar pipe, and the transistorized emitter of said insulated gate bipolar pipe is connected on the dc bus negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104598504A CN102496921A (en) | 2011-12-31 | 2011-12-31 | Intelligent protection device for doubly-fed converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104598504A CN102496921A (en) | 2011-12-31 | 2011-12-31 | Intelligent protection device for doubly-fed converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102496921A true CN102496921A (en) | 2012-06-13 |
Family
ID=46188720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104598504A Pending CN102496921A (en) | 2011-12-31 | 2011-12-31 | Intelligent protection device for doubly-fed converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102496921A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383578A (en) * | 2008-09-22 | 2009-03-11 | 艾默生网络能源有限公司 | Dual-feeding motor system having protecting device and protecting method thereof |
| CN101719664A (en) * | 2008-09-30 | 2010-06-02 | 再生动力***股份公司 | Overload protection device for wind farms |
| CN201623465U (en) * | 2009-09-23 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Crowbar protective device of double-feed wind power converter |
| CN201733111U (en) * | 2010-06-09 | 2011-02-02 | 王超 | Main circuit of active CROWBAR of double-fed wind-driven generator |
| US20110210553A1 (en) * | 2008-10-20 | 2011-09-01 | Woodward Kempen Gmbh | Protection System of a Doubly-fed Induction Machine |
-
2011
- 2011-12-31 CN CN2011104598504A patent/CN102496921A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383578A (en) * | 2008-09-22 | 2009-03-11 | 艾默生网络能源有限公司 | Dual-feeding motor system having protecting device and protecting method thereof |
| CN101719664A (en) * | 2008-09-30 | 2010-06-02 | 再生动力***股份公司 | Overload protection device for wind farms |
| US20110210553A1 (en) * | 2008-10-20 | 2011-09-01 | Woodward Kempen Gmbh | Protection System of a Doubly-fed Induction Machine |
| CN201623465U (en) * | 2009-09-23 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Crowbar protective device of double-feed wind power converter |
| CN201733111U (en) * | 2010-06-09 | 2011-02-02 | 王超 | Main circuit of active CROWBAR of double-fed wind-driven generator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8922173B2 (en) | DC chopper and DC chopping method for doubly fed induction generator system | |
| Petersson et al. | A DFIG wind turbine ride‐through system. Influence on the energy production | |
| CN208738855U (en) | A kind of bipolar soft straight network system of wind-powered electricity generation | |
| CN101969201A (en) | Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT) | |
| CN105048497B (en) | Doubly-fed wind turbine generator low-voltage ride through method | |
| CN102064714B (en) | Doubly-fed wind power frequency converter | |
| CN104009497A (en) | Low voltage ride through and active power filter compensation device of wind turbine generator and switching method | |
| CN105656051A (en) | Transient-energy dissipation device | |
| CN102386632A (en) | Device and method for double-fed crowbar to pass through power grid fault | |
| CN103337871B (en) | Wind generating set low voltage ride through circuit and corresponding control method | |
| CN102324755B (en) | Low-voltage ride through control method and device for doubly-fed wind power generating system | |
| CN205070452U (en) | Double -fed type wind turbine generator system high voltage system of passing through | |
| CN102412597A (en) | Low voltage ride through control method and device for a double-fed wind power generation system | |
| CN201829955U (en) | Dynamic voltage stabilizer for helping wind power generator to implement low voltage ride-through | |
| CN201869106U (en) | Double-feed wind power frequency converter | |
| CN201466745U (en) | Low-voltage cross-over double-fed wind power generator frequency converter | |
| CN202435016U (en) | Quick protection circuit device for double-fed wind power generation system | |
| CN106300415A (en) | A kind of low-voltage ride-through method of brushless dual-feedback wind power generator group combination | |
| CN203445627U (en) | Wind power generator set high and low voltage ride through device and system thereof | |
| CN102790406B (en) | Doubly-fed converter with reliable low-voltage ride-through capacity | |
| CN204928185U (en) | Current -limiting formula unified power flow controller based on many level of modularization transverter | |
| CN102412599A (en) | Crowbar device for low-voltage ride-through for double-fed wind driven power generation system | |
| CN201682292U (en) | Chopping device based on low-voltage ride-through | |
| CN102496921A (en) | Intelligent protection device for doubly-fed converter | |
| CN201766546U (en) | Wind generating set protector for coping with voltage dip of power grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120613 |