CN102255299B - Method and device for actively protecting double-fed wind power generator converter - Google Patents
Method and device for actively protecting double-fed wind power generator converter Download PDFInfo
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- CN102255299B CN102255299B CN201110203803.3A CN201110203803A CN102255299B CN 102255299 B CN102255299 B CN 102255299B CN 201110203803 A CN201110203803 A CN 201110203803A CN 102255299 B CN102255299 B CN 102255299B
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Abstract
The invention discloses a method and a device for actively protecting a double-fed wind power generator converter. A crowbar protection device accesses a rotor side of the converter, provides bypass for a rotor side circuit, limits a current which passes through a double-fed converter and keeps a generator from operating out of network by using a low-voltage ride-through control strategy. When a system is stabilized, the crowbar protection device is cut off, and a double-fed wind power generator normally operates. The invention is characterized in that: an output end of the crowbar protection device is connected with an A phase, a B phase and a C phase of the rotor side of the double-fed converter; a relay and the converter are connected as shown by figure 2; coils Q of the relay are connected in series to a main circuit of a crowbar; and a switch of the relay is connected in series with R1, so the converter can control the switch-on and switch-off of the relay, the switch-on or switch-off of the relay is determined by the size of the current which passes through operating coils of the relay, and the crowbar protection device is controlled to be triggered or not.
Description
Technical field
The present invention relates to a kind of guard method and device of wind-driven generator, is the active Crowbar(crowbar protection of a kind of double-fed wind power generator converter specifically) guard method and device, be mainly used in the control system of double-fed wind power generator.
Background technology
In the generator amature side of double-fed wind power generator converter, Crowbar protective device is generally all housed, for preventing when electrical network breaks down, cause the excessive and infringement to current transformer of rotor current.
Traditional double-fed wind power generator converter Crowbar protection strategy is: when electrical network breaks down, rotor current is excessive, and after learning that by detection rotor current is excessive, master control system is sent instruction and started Crowbar protective circuit, thus protection current transformer.Because this protection strategy need to be equipped with for wind-driven generator controller and the testing circuit thereof of a special use, and the reliability of this controller, reaction speed are had relatively high expectations, thereby make its cost higher.
At periodicals and magazines < < high voltage technique > > the 36th volume, the 3rd phase disclosed one piece of " a kind of experimental study of double-fed fan motor unit low voltage crossing characteristic " paper, wherein also mentioned and having analyzed on the basis of double-fed unit voltage roll-off characteristic, the method that has adopted the active Crowbar circuit of rotor and DC side-discharging circuit to combine realizes the low voltage ride-through function of double-fed fan motor unit, and by simulating, verifying the correctness of circuit structure and control strategy.But the rotor-side Crowbar protective device that this paper is introduced still needs a control device to control, so still there is the defect of problem noted earlier.Therefore necessary this is improved.
Summary of the invention
In order to solve the problems of the technologies described above; the present invention aims to provide the active Crowbar protected mode of a kind of double-fed wind power generator converter and device; the active Crowbar protected mode of this double-fed wind power generator converter and device do not need nonshared control unit in controlling run; not only reduce installation cost, and be convenient for changing maintenance.
The technical scheme that the present invention solves the problems of the technologies described above is: the active Crowbar guard method of a kind of double-fed wind power generator converter; at current transformer rotor-side access Crowbar protective device; for rotor-side circuit provides bypass; the electric current of restricted passage double-feed current transformer; the low voltage crossing control strategy that coordinates again main controller, maintains not off-grid operation of generator with this.After system stability, excision Crowbar protective device, double-fed wind power generator proceeds to normal operation.It is characterized in that: Crowbar protective device is that the control system being combined to form by relay and double-feed current transformer is controlled; Described Crowbar protective device produces termination double-feed current transformer rotor-side A, B, C three-phase, and relay is connected as shown in Figure 2 with current transformer, and wherein pulling relay coil is connected on the main circuit of Crowbar, and the switch on relay road and resistance R 1 are in series.Thereby current transformer can be controlled its break-make, by the size of current by pulling relay coil, decide relay switch closure state, thereby the triggering of controlling Crowbar protective device whether.
Relay coil is connected on the main circuit that Crowbar protective circuit is connected with rotor-side converter, the switch of relay can resistance be cascaded with releasing, also be located on the main circuit that Crowbar protective circuit is connected with rotor-side converter, simultaneously at the switch of relay with release can the other RC filter circuit that be parallel with of resistance, relay coil can control relay switch closure, thereby trigger Crowbar protective device; But relay coil is the disconnection of control relay switch separately, need relay coil and current transformer all to send under instruction, relay switch just can disconnect; Current transformer can send instruction makes relay switch closed.
Under normal circumstances, three-phase alternating current is symmetrical three-phase alternating current, and its voltage, electric current sum are zero, thereby under normal circumstances, the electric current by pulling relay coil is zero; When rotor current produces little disturbance current, pulling relay coil can adhesive, and electric current, after the RC filter circuit filtering of flowing through, in feed-in electrical network, can not cause energy dissipation; When electrical network breaks down, it is large that rotor current becomes, and causes becoming large by the electric current of pulling relay coil, pulling relay coil adhesive, K switch is closed, by the mode loss with heat energy in resistance R 1 of the energy of rotor current generation, thereby avoids the damage to current transformer.After rotor current recovers normally, electric current by pulling relay coil diminishes, pulling relay coil unclamps, in order to prevent current oscillation, cause the frequent movement of relay, by current transformer by the detection of rotor current being carried out to the disconnection of control switch K, thereby make Crowbar circuit return to normal condition.
The active Crowbar protective device of the active Crowbar protection of the double-fed wind power generator converter double-fed wind power generator converter proposing according to said method, comprising: Crowbar protective circuit, RC filter circuit and relay; Described relay is connected with current transformer; relay coil is connected on the main circuit that Crowbar protective circuit is connected with rotor-side converter; the switch of relay can resistance be cascaded with releasing; also be located on the main circuit that Crowbar protective circuit is connected with rotor-side converter; simultaneously the switch of RC filter circuit and relay is with to release energy resistance in parallel, and current transformer is controlled separately its break-make.
Described Crowbar protective circuit is that three-phase diode forms, and every is to be composed in series by 2 diodes mutually, three groups of totally 6 diodes.
Described relay and current transformer are connected, and current transformer can be controlled its action.
Described filter circuit and switch are in parallel, and feature is the in the situation that of little current disturbing, with the filtering of RC filter circuit; Under large current conditions, just trigger relay switch, releases energy.Wherein by resistance and capacitance group, become filter circuit, the resistance of resistance is generally more greatly 30 ohm of left and right;
Described releasing can resistance, and its resistance is very little, generally below 3 ohm.
Described pulling relay coil is connected on the major loop of Crowbar, for according to the size of current on major loop, determines whether to trigger Crowbar protective device.Under normal condition, the switch of relay disconnects.
Beneficial effect of the present invention has:
1. simple circuit structure design is effectively reduced apparatus of the present invention cost.
2. the triggering that whether adhesive by relay coil decides Crowbar protective device whether; no longer need to the detection of circuital current, to decide Crowbar protective device whether to trigger by controller; improve the response speed of Crowbar protective device, also improved its reliability simultaneously.
3. when rotor current produces little disturbance current, pulling relay coil can adhesive, and electric current, after the RC filter circuit filtering of flowing through, in feed-in electrical network, can not cause energy dissipation.
4. the parts that the present invention relates to are less, and simplicity of design is conducive to later stage replacing and safeguards.
Accompanying drawing explanation
Fig. 1 is system principle schematic diagram of the present invention;
Fig. 2 is physical circuit figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
By attached Fig. 1 and 2, can find out; the present invention relates to the active Crowbar guard method of a kind of double-fed wind power generator converter; at double-feed current transformer 2 rotor-side access Crowbar protective devices 1; for double-feed current transformer 2 rotor-side circuit provide bypass; the electric current of restricted passage double-feed current transformer 2; the low voltage crossing control strategy that coordinates again main controller, maintains not off-grid operation of double-fed wind power generator 3 with this.After system stability, excision Crowbar protective device 1, double-fed wind power generator 3 proceeds to normal operation.It is characterized in that: Crowbar protective device 1 is that the control system being combined to form by relay 4 and double-feed current transformer 2 is controlled; Described Crowbar protective device 1 produces termination double-feed current transformer 2 rotor-side A, B, C three-phase; relay 4 be connected with double-feed current transformer 2 (as shown in Figure 2); the pulling relay coil 5 of its repeat circuit 4 is connected on the main circuit of Crowbar, and the K switch on relay road 4 and resistance R 1 are in series.Thereby double-feed current transformer 2 can be controlled its break-make, by the size of current by pulling relay coil 5, decided the closure state of the K switch of relay, thereby the triggering of controlling Crowbar protective device 1 whether.
In order to prevent the damage of overcurrent to current transformer; at double-feed current transformer 2 rotor-side access Crowbar protective devices 1, for rotor-side circuit provides bypass, the electric current of restricted passage double-feed current transformer 2; the low voltage crossing control strategy that coordinates again main controller, maintains not off-grid operation of generator with this.After system stability, excision Crowbar protective device 1, double-fed wind power generator proceeds to normal operation.
Pulling relay coil 5 is connected on the main circuit that Crowbar protective device 1 is connected with rotor-side converter, the K switch of relay and resistance R 1 are cascaded, K switch and resistance R 1 are also located on the main circuit that Crowbar protective device 1 is connected with rotor-side converter, on K switch and resistance R 1 side of relay, be parallel with a RC filter circuit 6 simultaneously, pulling relay coil 5 can control relay K switch closure, thereby trigger Crowbar protective device 1; But pulling relay coil 5 is the disconnection of control relay switch separately, need pulling relay coil 5 and double-feed current transformer 2 all to send under instruction, relay switch K just can disconnect; Double-feed current transformer 2 can send instruction makes relay switch K closed.
Under normal circumstances, three-phase alternating current is symmetrical three-phase alternating current, and its voltage, electric current sum are zero, thereby under normal circumstances, the electric current by pulling relay coil 5 is zero; When rotor current produces little disturbance current, pulling relay coil 5 can adhesive, and electric current, after RC filter circuit 6 filtering of flowing through, in feed-in electrical network, can not cause energy dissipation; When electrical network breaks down, it is large that rotor current becomes, and causes becoming large by the electric current of pulling relay coil 5, pulling relay coil 5 adhesives, K switch is closed, by the mode loss with heat energy in resistance R 1 of the energy of rotor current generation, thereby avoids the damage to current transformer.After rotor current recovers normally; electric current by pulling relay coil 5 diminishes; pulling relay coil 5 unclamps; in order to prevent current oscillation, cause the frequent movement of relay; by double-feed current transformer 2 by the detection of rotor current being carried out to the disconnection of control switch K, thereby make Crowbar protective device 1 return to normal condition.
The active Crowbar protective device of double-fed wind power generator converter proposing according to said method, comprising: Crowbar protective device 1, double-feed current transformer 2, RC filter circuit 6 and relay 4; Described relay 4 is connected with double-feed current transformer 2; pulling relay coil 5 is connected on the main circuit that Crowbar protective device 1 is connected with rotor-side converter; the K switch of relay 4 and resistance R 1 are cascaded; K switch and resistance R 1 are also located on the main circuit that Crowbar protective device 1 is connected with the rotor-side converter of double-feed current transformer 2; RC filter circuit 6 is in parallel with resistance R 1 with the K switch of relay 4 simultaneously, and double-feed current transformer 2 can be controlled separately its break-make.
Described Crowbar protective device 1 is that three-phase diode forms, and every is to be composed in series by 2 diodes 7 mutually, three groups of totally 6 diodes.
Described relay 4 is connected with double-feed current transformer 2, and double-feed current transformer 2 can be controlled its action.
Described RC filter circuit 6 is in parallel with K switch, and feature is the in the situation that of little current disturbing, with the filtering of RC filter circuit; Under large current conditions, just trigger relay switch, releases energy.Wherein by resistance and capacitance group, become filter circuit, the resistance of resistance is generally more greatly 30 ohm of left and right;
Described releasing can resistance, and its resistance is very little, generally below 3 ohm.
Described pulling relay coil 5 is connected on the major loop of Crowbar protective device 1, for according to the size of current on major loop, determines whether to trigger Crowbar protective device.Under normal condition, the K switch of relay disconnects.
Under normal operation, rotor current transformer is controlled the rotating speed of generator, and net side converter is controlled the flow of power between rotor and electrical network, keeps the capacitance voltage between two current transformers constant.When voltage falls, therefore main flux can not undergo mutation owing to having very large time constant, and rotating speed is owing to being that mechanical process more can not occur to change fast, therefore the back electromotive force of motor can not change, so a very large voltage difference will be applied between the resistance and leakage inductance of stator winding.This can cause stator current to occur over-current phenomenon avoidance.According to the magnetic linkage equilibrium equation of motor, can learn that rotor current also there will be over-current phenomenon avoidance.
In order to prevent the damage of overcurrent to current transformer; at current transformer rotor-side access Crowbar protective device, for rotor-side circuit provides bypass, the electric current of restricted passage double-feed current transformer; the low voltage crossing control strategy that coordinates again main controller, maintains not off-grid operation of generator with this.After system stability, excision Crowbar protective device, double-fed wind power generator proceeds to normal operation.
Operation principle: under normal circumstances, three-phase alternating current is symmetrical three-phase alternating current, its voltage, electric current sum are zero, thus under normal circumstances, the electric current by pulling relay coil 5 is zero; When rotor current produces little disturbance current, pulling relay coil can adhesive, and electric current, after RC filter circuit 6 filtering of flowing through, in feed-in electrical network, can not cause energy dissipation; When electrical network breaks down, it is large that rotor current becomes, and causes becoming large by the electric current of pulling relay coil 5, pulling relay coil 5 adhesives, K switch is closed, by the mode loss with heat energy in resistance R 1 of the energy of rotor current generation, thereby avoids the damage to current transformer.After rotor current recovers normally, electric current by pulling relay coil 5 diminishes, pulling relay coil 5 unclamps, in order to prevent current oscillation, cause the frequent movement of relay, by current transformer by the detection of rotor current being carried out to the disconnection of control switch K, thereby make Crowbar circuit return to normal condition.
Embodiment mono-
If Fig. 1～2 are as shown, the active Crowbar protective device of a kind of double-fed wind power generator converter, comprising: diode 7, relay 4, double-feed current transformer 2, high-power resistance R1, filter resistance R, filter capacitor C; Crowbar protective device 1 produces termination double-feed current transformer 2 rotor-side A, B, C three-phase, and relay 4 is connected with double-feed current transformer 2, and double-feed current transformer 2 can be controlled its break-make; Wherein, pulling relay coil 5 is the pull-in winding of relay 4, and K is relay switch, according to general relay principle, and when the electric current in pull-in winding is greater than critical value, coil adhesive, switch is closed; When the electric current in pull-in winding is less than critical value, coil unclamps, and switch disconnects.But in this invention, as shown in table 1, pulling relay coil 5 is connected with double-feed current transformer 2, the closure that pulling relay coil 5 can control relay K switch, thus trigger Crowbar protective device; But pulling relay coil 5 is the disconnection of control relay K switch separately, need pulling relay coil 5 and double-feed current transformer 2 all to send under instruction, relay switch K just can disconnect; But double-feed current transformer 2 can send separately instruction makes relay switch K closed.Current transformer coordinates as following table 1 with the action of relay switch K:
Table 1
In the present embodiment, double-fed wind power generator 3, double-feed current transformer 2 and Crowbar protective device 1 have formed dual feedback wind power generation system Crowbar circuit; Wherein, three-phase diode part, every is to be composed in series by 2 diodes mutually, three-phase is totally 6 diodes, thereby controls the flow direction of its electric current; RC filter circuit and K switch are in parallel, and feature is in the situation of little current disturbing, with the filtering of RC filter circuit; Under large current conditions, just trigger relay K switch, can resistance R 1 release energy by releasing; Pulling relay coil Q is connected on main circuit, in order to detect the variation of main circuit current; When electrical network breaks down, rotor current change is large, cause becoming large by the electric current of pulling relay coil, and coil adhesive, K switch is closed, by the mode loss with heat energy in resistance R 1 of the energy of rotor current generation, thereby avoids the damage to current transformer.After rotor current recovers normally, electric current by pulling relay coil diminishes, and coil unclamps, and causes the frequent movement of relay in order to prevent current oscillation, by current transformer by the detection of rotor current being carried out to the disconnection of control switch K, thereby make Crowbar circuit return to normal condition.
Above execution mode is used for illustrative purposes only; but not limitation of the present invention; those skilled in the art; without departing from the spirit or scope of the invention in the situation that; the technical scheme of making various equivalents or variation belongs to protection category of the present invention, by every claim, is limited.
Claims (9)
1. the active guard method of double-fed wind power generator converter, at double-feed current transformer rotor-side access Crowbar protective device, for double-feed current transformer rotor-side circuit provides bypass, the electric current of restricted passage double-feed current transformer, the low voltage crossing control strategy that coordinates again main controller, maintains not off-grid operation of double-fed wind power generator with this; After system stability, excision Crowbar protective device, double-fed wind power generator proceeds to normal operation; It is characterized in that: Crowbar protective device is that the control system being combined to form by relay and double-feed current transformer is controlled; Described Crowbar protective device produces termination double-feed current transformer rotor-side A, B, C three-phase, relay is connected with double-feed current transformer, wherein, the pulling relay coil of relay is connected on the main circuit of Crowbar protective device, relay switch can resistance be in series with releasing, relay switch can resistance be cascaded with releasing, be also located on the main circuit that Crowbar protective device is connected with rotor-side converter, simultaneously relay switch with release energy resistance side and be parallel with a RC filter circuit; Thereby double-feed current transformer can be controlled relay on-off, by the size of current by pulling relay coil, decided the closure state of relay switch, thereby the triggering of controlling Crowbar protective device whether.
2. the active guard method of double-fed wind power generator converter as claimed in claim 1, it is characterized in that: pulling relay coil is connected on the main circuit that Crowbar protective device is connected with rotor-side converter, the closure of pulling relay coil control relay switch, thus Crowbar protective device triggered; But pulling relay coil is controlled by double-feed current transformer, and be according to the detection of rotor current is carried out to control relay pull-in winding, then by the disconnection of pulling relay coil control relay switch by double-feed current transformer.
3. the active guard method of double-fed wind power generator converter as claimed in claim 1, it is characterized in that: under normal circumstances, three-phase alternating current is symmetrical three-phase alternating current, its voltage, electric current sum are zero, thereby under normal circumstances, the electric current by pulling relay coil is zero; When rotor current produces little disturbance current, pulling relay coil can adhesive, and electric current is after the RC filter circuit filtering of flowing through, in feed-in electrical network; When electrical network breaks down, it is large that rotor current becomes, and causes becoming large by the electric current of pulling relay coil, pulling relay coil adhesive, relay switch is closed, by the mode loss with heat energy on resistance of the energy of rotor current generation, thereby avoids the damage to double-feed current transformer; After rotor current recovers normally; electric current by pulling relay coil diminishes; pulling relay coil unclamps; in order to prevent current oscillation, cause the frequent movement of relay; by double-feed current transformer by the detection of rotor current being carried out to the disconnection of control relay switch, thereby make Crowbar protective device return to normal condition.
According to claim 1 the active guard method of double-fed wind power generator converter the active Crowbar protective device of double-fed wind power generator converter, comprising: Crowbar protective device, RC filter circuit and relay; It is characterized in that: described relay is connected with double-feed current transformer; pulling relay coil is connected on the main circuit that Crowbar protective device is connected with rotor-side converter; relay switch can resistance be cascaded with releasing; also be located on the main circuit that Crowbar protective device is connected with rotor-side converter; simultaneously RC filter circuit and relay switch be with to release energy resistance in parallel, the independent control relay break-make of double-feed current transformer.
5. double-fed wind power generator converter active protective device as claimed in claim 4, is characterized in that: described Crowbar protective device is that three-phase diode forms, and every is to be composed in series by 2 diodes mutually, three groups of totally 6 diodes.
6. double-fed wind power generator converter active protective device as claimed in claim 5, is characterized in that: described RC filter circuit is connected in parallel on relay switch and releases by energy resistance, and the in the situation that of little current disturbing, with the filtering of RC filter circuit; Under large current conditions, just trigger relay switch, releases energy.
7. double-fed wind power generator converter active protective device as claimed in claim 6, is characterized in that: described RC filtered electrical routing resistance and electric capacity form, and the resistance of resistance is 30 ohm.
8. double-fed wind power generator converter active protective device as claimed in claim 6, is characterized in that: described releases energy resistance below 3 ohm.
9. double-fed wind power generator converter active protective device as claimed in claim 6, it is characterized in that: described pulling relay coil is connected on the main circuit of Crowbar protective device, according to the size of current on main circuit, determine whether to trigger Crowbar protective device; Under normal condition, relay switch disconnects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110203803.3A CN102255299B (en) | 2011-07-21 | 2011-07-21 | Method and device for actively protecting double-fed wind power generator converter |
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| CN201110203803.3A CN102255299B (en) | 2011-07-21 | 2011-07-21 | Method and device for actively protecting double-fed wind power generator converter |
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| CN102255299A CN102255299A (en) | 2011-11-23 |
| CN102255299B true CN102255299B (en) | 2014-04-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102916441B (en) * | 2012-10-15 | 2014-04-23 | 南通大学 | Segmentation control method for low-voltage ride-through of doubly-fed motor during symmetric drop of network voltage |
| EP3729580B9 (en) * | 2017-12-20 | 2022-12-21 | Vestas Wind Systems A/S | Recurring fault protection for wind power plants |
| CN111864709B (en) * | 2019-04-16 | 2022-05-10 | 维谛新能源有限公司 | Overload protection method, control method and device and wind power converter |
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