CN102412597A - Low voltage ride through control method and device for a double-fed wind power generation system - Google Patents
Low voltage ride through control method and device for a double-fed wind power generation system Download PDFInfo
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- CN102412597A CN102412597A CN2011103929868A CN201110392986A CN102412597A CN 102412597 A CN102412597 A CN 102412597A CN 2011103929868 A CN2011103929868 A CN 2011103929868A CN 201110392986 A CN201110392986 A CN 201110392986A CN 102412597 A CN102412597 A CN 102412597A
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- crowbar
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a low voltage ride through control method and device for a double-fed wind power generation system, which are suitable for the field of high-power wind power generation. The low voltage ride through control method is realized by a fall detection part, a fall judgment part and a triggering operation part; the low voltage ride through control device comprises a bidirectional converter, a converter controller and an active crowbar module. The invention has the advantages that: the control on low voltage rid through is realized by a crowbar circuit, thus preventing the secondary overcurrent effectively, and facilitating the recovery of a power grid; and the low voltage ride through device in the invention has strong rid through capacity and good effect.
Description
Technical field
The present invention relates to a kind of dual feedback wind power generation system low voltage traversing control method and device, be applicable to high-power wind power generation.The field.
Background technology
Along with the increase of grid connected wind power unit, influencing each other of itself and electrical network is remarkable gradually.When line voltage breaks down when falling; If do not control; Can cause the damage of wind-powered electricity generation unit and current transformer and electrical network is produced power rush, wind turbine generator also can off-the-line, and will bring the transient state of electric power system unstable; Possibly cause part even system to be paralysed comprehensively, endanger other equipment on the electrical network even cause the user to lose.Therefore national grid requires the grid type wind power plant must possess the electric network fault ride-through capability; Promptly when electric network fault or disturbance cause the electric voltage dropping of wind farm grid-connected point; In the scope of electric voltage dropping, the wind-powered electricity generation unit can uninterruptedly be incorporated into the power networks, and also needing in case of necessity provides certain reactive power to support power system restoration to electrical network; Recover normal up to line voltage, thus " passing through " this low-voltage time.
When falling,, therefore can produce DC component in stator side because stator magnetic linkage can not suddenly change in line voltage moment.The stator magnetic linkage DC component is not rotated when the space, so can produce very big slip with respect to rotor, makes rotor loop produce overcurrent, overvoltage like this.Asymmetric fault can make the overcurrent overvoltage more serious, because in stator voltage, there is negative sequence component again, and negative sequence component also can produce very high slip.The excessive current transformer that damaged of electric current; Overtension has damaged the generator amature winding; So for during electric network fault; In order to protect rotor-side converter and generator amature winding, make the double-fed wind power generator group have low voltage ride-through capability, commercial double-fed wind power generator group mostly is equipped with the Crowbar circuit.
There is following defective in the Crowbar protective circuit of in low-voltage is passed through, using at present: (1) capacity is less can not to adapt to big capacity dual feedback wind power generation system, and hard-wired difficulty is bigger; (2) be not easy expansion, can not adjust the absorbability of Crowbar circuit according to on-the-spot different type of machines; (3) capacity is fixed, and different type of machines need design different Crowbar circuit again.
Summary of the invention
To the problem that above-mentioned prior art exists, the present invention provides a kind of dual feedback wind power generation system low voltage traversing control method and device, has effectively prevented the secondary overcurrent, helps the recovery of electrical network; Ride-through capability is strong, effective.
To achieve these goals; The technical scheme that the present invention adopts is: a kind of dual feedback wind power generation system low voltage traversing control method and device; Fall test section detection of grid voltage signal, rotor current, DC bus-bar voltage signal, import that to fall the judgment part be that inverter controller is judged into, fall test section detection of grid voltage signal, rotor current signal, DC bus-bar voltage signal; Import that to fall the judgment part be that inverter controller is judged into; When satisfying low-voltage and pass through condition, inverter controller is just stopped paying out the pulse of pusher side current transformer, triggers IGBT1 incision Crowbar simultaneously; IGBT1 among the Crowbar is open-minded, the transient state impulse current in the high-power absorption resistance rapid release double fed electric machine rotor winding; After rotor current decayed to rated value, IGBT1 turn-offed, and the buffer circuit that D2, R2, R3, R4 and C form absorbs the energy of shutdown moment, protection IGBT1.Continue to judge that after detecting the rotor-side surge current and being absorbed, excision Crowbar is beneficial to power system restoration with the absorption of minimizing to electric network reactive-load earlier simultaneously to falling the signal that imports into the test section; By the time after line voltage recovers, restart the starter motor side converter and generate electricity by way of merging two or more grid systems, during practical application according to the Crowbar module of different capabilities demand parallel connection corresponding number.
A kind of dual feedback wind power generation system low-voltage is passed through control device, comprises two way convertor, inverter controller and Crowbar module, and described Crowbar module comprises that three-phase bridge do not control rectifier bridge, high-power absorption resistance and buffering circuit.
Two way convertor pusher side three-phase is connected with the three-phase of double fed electric machine rotor winding, and net side converter three-phase is connected with three phase network.
The Crowbar module is connected between double fed electric machine rotor winding and the reversible power inverter.
Two way convertor, Crowbar module and be connected with electric machine controller.
The Crowbar module can realize a plurality of synchronous parallel connections, decides the quantity of parallelly connected Crowbar module according to current transformer and capacity motor.
Be connected through principal and subordinate's driver between module and the module.
The invention has the beneficial effects as follows: the present invention adopts the Crowbar circuit to realize the control that low-voltage is passed through, and has effectively prevented the secondary overcurrent, helps the recovery of electrical network; The ride-through capability of low-voltage traversing device of the present invention is strong, effective.
Description of drawings
Fig. 1 is control system figure of the present invention;
Fig. 2 is Crowbar protective circuit figure of the present invention;
Fig. 3 is a Crowbar module expanded view of the present invention.
Among the figure: 1, three phase network, 2, the net side converter, 3, the pusher side current transformer, 4, the double fed electric machine rotor winding; 5, wind energy conversion system, 6,7, the double feedback electric engine stator winding, 8, switch is incorporated into the power networks; 9, inverter controller, 10, the Crowbar module, 11, fall testing circuit.
UR is a not controlled bridge-type rectifier of three-phase, and R1 is high-power bleeder resistance 1, and R2 is a resistance 2, and R3 is a resistance 3, and R4 is a resistance 4, and D1 is a diode 1, and D2 is a diode 2, and D3 is a diode 3, and IGBT1 is an igbt, and C is an electric capacity; P1 is the 15V DC power supply; T
InIt is the main triggering signal input that drives; T
OutIt is the main triggering signal output that drives; T1
InFor first from driving the triggering signal input; T1
OutFor first from driving the triggering signal output; Tn
InBe that n is individual from driving the triggering signal input; Tn
OutFor first from driving the triggering signal output;
Embodiment
To combine accompanying drawing that the present invention is described further below.
Like Fig. 1, Fig. 2 and shown in Figure 3; A kind of dual feedback wind power generation system low voltage traversing control method and device; Fall test section detection of grid voltage signal, rotor current, DC bus-bar voltage signal, import that to fall the judgment part be that inverter controller 9 is judged into, fall test section detection of grid voltage signal, rotor current signal, DC bus-bar voltage signal; Import that to fall the judgment part be that inverter controller 9 is judged into; When satisfying low-voltage and pass through condition, inverter controller 9 is just stopped paying out 3 pulses of pusher side current transformer, triggers IGBT1 incision Crowbar simultaneously; IGBT1 among the Crowbar is open-minded, the transient state impulse current in the high-power absorption resistance rapid release double fed electric machine rotor winding 4; After rotor current decayed to rated value, IGBT1 turn-offed, and the buffer circuit that D2, R2, R3, R4 and C form absorbs the energy of shutdown moment, protection IGBT1.Continue to judge that after detecting the rotor-side surge current and being absorbed, excision Crowbar is beneficial to power system restoration with the absorption of minimizing to electric network reactive-load earlier simultaneously to falling the signal that imports into the test section; By the time after line voltage recovers, restart starter motor side converter 3 and generate electricity by way of merging two or more grid systems, during practical application according to the Crowbar module 10 of different capabilities demand parallel connection corresponding number.
A kind of dual feedback wind power generation system low-voltage is passed through control device, comprises two way convertor, inverter controller 9 and Crowbar module 10, and described Crowbar module 10 comprises that three-phase bridge do not control rectifier bridge, high-power absorption resistance and buffering circuit; Two way convertor pusher side three-phase is connected with the three-phase of double fed electric machine rotor winding 4, and net side converter 2 three-phases are connected with three phase network 1; Crowbar module 10 is connected between double fed electric machine rotor winding 4 and the reversible power inverter; Two way convertor, Crowbar module 10 and be connected with electric machine controller; Crowbar module 10 can realize a plurality of synchronous parallel connections, decides the quantity of parallelly connected Crowbar module 10 according to current transformer and capacity motor; Be connected through principal and subordinate's driver between module and the module.
The present invention includes three phase network 1, net side converter 2, pusher side current transformer 3; Double fed electric machine rotor winding 4, wind energy conversion system 5, double feedback electric engine stator winding 6,7; The switch 8 that is incorporated into the power networks, inverter controller 9, Crowbar module 10; Fall testing circuit 11, pusher side current transformer 3 three-phase terminals are connected with the three-phase terminal of double fed electric machine rotor winding 4, and net side converter 2 three-phase terminals are connected with three phase network 1; Crowbar module 10 is parallel on the three-phase circuit between double fed electric machine rotor winding 4 and the pusher side current transformer 3; Said pusher side current transformer 3, Crowbar module 10 and signal deteching circuit 11 are by inverter controller 9 controls.Main Crowbar1 is parallelly connected from Crowbar with all the other in the Crowbar module 10, and main Crowbar and from Crowbar, and except that driving, structure and parameter is identical.
Controlled bridge-type rectifier UR, high-power absorption resistance and buffering circuit bank do not become said principal and subordinate Crowbar by three-phase.The anode utmost point of backward diode D1 is connected with the collector electrode of insulated gate bipolar transistor IGBT 1, negative electrode with do not control the rectifier bridge Up Highway UHW and be connected; R2 and D3 connect with capacitor C with the shunt circuit of R3 and constitute RCD absorption circuit, and insulated gate bipolar transistor IGBT 1 absorbs circuit with this RCD and forms parallel circuits; Sustained diode 1 is with parallelly connected as the parallelly connected R1 of power absorption resistance, and the aftercurrent when IGBT1 turn-offs on the R1 goes up afterflow from sustained diode 1 with RCD; They constitute the Crowbar circuit jointly with the current-limiting resistance R4 that plays restriction R1 size of current.
When electrical network generation low voltage failure; Fall testing circuit 11 detected low voltage failure signal is passed to inverter controller 9; Inverter controller 9 receives and sends control command behind this signal and stop paying out 3 pulses of pusher side current transformer; Send triggering signal simultaneously and open the parallelly connected principal and subordinate Crowbar in the Crowbar circuit 10, the transient state impulse current in the rapid release double fed electric machine rotor winding 4; Fall testing circuit 11 simultaneously and continue detection of grid voltage signal, rotor current signal, DC bus-bar voltage signal; After inverter controller 9 judges that detected mains voltage signal, rotor current signal, DC bus-bar voltage signal are normally; Inverter controller 9 sends signal again and cuts out the Crowbar circuit; The reactive power that absorbs from electrical network when the minimizing double feedback electric engine is in mouse cage machine running status helps line voltage and recovers, and can prevent the secondary overcurrent well simultaneously.After line voltage recovered, inverter controller 9 was retransmitted 3 pulses of pusher side current transformer and is begun operate as normal.
Claims (8)
1. the low voltage traversing control method of a dual feedback wind power generation system; It is characterized in that; Fall test section detection of grid voltage signal, rotor current, DC bus-bar voltage signal, import that to fall the judgment part be that inverter controller (9) is judged into, fall test section detection of grid voltage signal, rotor current signal, DC bus-bar voltage signal; Import that to fall the judgment part be that inverter controller (9) is judged into; When satisfying low-voltage and pass through condition, inverter controller (9) is just stopped paying out pusher side current transformer (3) pulse, triggers IGBT1 incision Crowbar simultaneously; IGBT1 among the Crowbar is open-minded, the transient state impulse current in the high-power absorption resistance rapid release double fed electric machine rotor winding (4); After rotor current decayed to rated value, IGBT1 turn-offed, and the buffer circuit that D2, R2, R3, R4 and C form absorbs the energy of shutdown moment, protection IGBT1.
2. continue to judge that after detecting the rotor-side surge current and being absorbed, excision Crowbar is beneficial to power system restoration with the absorption of minimizing to electric network reactive-load earlier simultaneously to falling the signal that imports into the test section; By the time after line voltage recovers, restart starter motor side converter (3) and generate electricity by way of merging two or more grid systems, during practical application according to the Crowbar module (10) of different capabilities demand parallel connection corresponding number.
3. a dual feedback wind power generation system low-voltage is passed through control device; Comprise two way convertor, inverter controller (9) and Crowbar module (10); It is characterized in that described Crowbar module (10) comprises that three-phase bridge do not control rectifier bridge, high-power absorption resistance and buffering circuit.
4. a kind of dual feedback wind power generation system low-voltage according to claim 2 is passed through control device; It is characterized in that; Described two way convertor pusher side three-phase is connected with the three-phase of double fed electric machine rotor winding (4), and net side converter (2) three-phase is connected with three phase network (1).
5. a kind of dual feedback wind power generation system low-voltage according to claim 2 is passed through control device, it is characterized in that, described Crowbar module (10) is connected between double fed electric machine rotor winding (4) and the reversible power inverter.
6. pass through control device according to claim 2 or 3 or 4 described a kind of dual feedback wind power generation system low-voltages, it is characterized in that, described two way convertor, Crowbar module (10) and be connected with electric machine controller.
7. pass through control device according to claim 2 or 4 described a kind of dual feedback wind power generation system low-voltages; It is characterized in that; Described Crowbar module (10) can realize a plurality of synchronous parallel connections, decides the quantity of parallelly connected Crowbar module (10) according to current transformer and capacity motor.
8. a kind of dual feedback wind power generation system low-voltage according to claim 2 is passed through control device, it is characterized in that, is connected through principal and subordinate's driver between described module and the module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103929868A CN102412597A (en) | 2012-02-07 | 2012-02-07 | Low voltage ride through control method and device for a double-fed wind power generation system |
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| CN2011103929868A CN102412597A (en) | 2012-02-07 | 2012-02-07 | Low voltage ride through control method and device for a double-fed wind power generation system |
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| CN102412597A true CN102412597A (en) | 2012-04-11 |
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| CN2011103929868A Pending CN102412597A (en) | 2012-02-07 | 2012-02-07 | Low voltage ride through control method and device for a double-fed wind power generation system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916441A (en) * | 2012-10-15 | 2013-02-06 | 南通大学 | Segmentation control method for low-voltage ride-through of doubly-fed motor during symmetric drop of network voltage |
| CN103441530A (en) * | 2013-09-06 | 2013-12-11 | 南车株洲电力机车研究所有限公司 | Wind power generating device group high and low voltage crossing device, system and method |
| CN105140959A (en) * | 2015-08-31 | 2015-12-09 | 国家电网公司 | Adjustable-resistance crowbar circuit and regulation and control method therefor |
| CN105162089A (en) * | 2015-08-26 | 2015-12-16 | 芜湖市凯鑫避雷器有限责任公司 | Drop-type arrester remote monitoring system |
| CN105470990A (en) * | 2016-01-08 | 2016-04-06 | 镇江华东电力设备制造厂有限公司 | System and method for controlling low voltage ride through of high-power direct-driven permanent magnet wind power generation system |
| CN108711883A (en) * | 2018-05-24 | 2018-10-26 | 国家电网公司 | Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system |
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| US6021035A (en) * | 1995-05-31 | 2000-02-01 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN102223126A (en) * | 2011-06-28 | 2011-10-19 | 北京清能华福风电技术有限公司 | Variable resistor Crowbar structures for low-voltage ride-through of wind power generation and method for realizing variable resistor Crowbar structures |
| CN102324755A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Low-voltage ride through control method and device for doubly-fed wind power generating system |
-
2012
- 2012-02-07 CN CN2011103929868A patent/CN102412597A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6021035A (en) * | 1995-05-31 | 2000-02-01 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| CN102223126A (en) * | 2011-06-28 | 2011-10-19 | 北京清能华福风电技术有限公司 | Variable resistor Crowbar structures for low-voltage ride-through of wind power generation and method for realizing variable resistor Crowbar structures |
| CN102324755A (en) * | 2011-10-11 | 2012-01-18 | 中国矿业大学 | Low-voltage ride through control method and device for doubly-fed wind power generating system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916441A (en) * | 2012-10-15 | 2013-02-06 | 南通大学 | Segmentation control method for low-voltage ride-through of doubly-fed motor during symmetric drop of network voltage |
| 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 |
| CN103441530A (en) * | 2013-09-06 | 2013-12-11 | 南车株洲电力机车研究所有限公司 | Wind power generating device group high and low voltage crossing device, system and method |
| CN105162089A (en) * | 2015-08-26 | 2015-12-16 | 芜湖市凯鑫避雷器有限责任公司 | Drop-type arrester remote monitoring system |
| CN105162089B (en) * | 2015-08-26 | 2018-02-23 | 芜湖市凯鑫避雷器有限责任公司 | Drop-type arrester remote monitoring system |
| CN105140959A (en) * | 2015-08-31 | 2015-12-09 | 国家电网公司 | Adjustable-resistance crowbar circuit and regulation and control method therefor |
| CN105470990A (en) * | 2016-01-08 | 2016-04-06 | 镇江华东电力设备制造厂有限公司 | System and method for controlling low voltage ride through of high-power direct-driven permanent magnet wind power generation system |
| CN108711883A (en) * | 2018-05-24 | 2018-10-26 | 国家电网公司 | Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system |
| CN108711883B (en) * | 2018-05-24 | 2020-07-03 | 国家电网公司 | Coordinated fault ride-through method for wind power plant through flexible direct current power transmission grid-connected system |
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