CN201466745U - Low-voltage cross-over double-fed wind power generator frequency converter - Google Patents
Low-voltage cross-over double-fed wind power generator frequency converter Download PDFInfo
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- CN201466745U CN201466745U CN2009201094886U CN200920109488U CN201466745U CN 201466745 U CN201466745 U CN 201466745U CN 2009201094886 U CN2009201094886 U CN 2009201094886U CN 200920109488 U CN200920109488 U CN 200920109488U CN 201466745 U CN201466745 U CN 201466745U
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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 utility model provides a low-voltage cross-over double-fed wind power generator frequency converter, which is characterized in that an intermediate direct current link includes a direct current capacitor and direct current voltage detectors parallelly connected at two ends of the direct current capacitor; the direct current voltage detectors are used for detecting the voltage of the intermediate direct current link; a rotor current bypass circuit further arranged in the frequency converter is formed by a current limit resistor, a three-phase uncontrolled rectifier and a fully controlled device which are in sequential series connection; the end of the current limit resistor serves as an incoming end of the current bypass circuit and is connected between a rotor and a rotor-side frequency converter; and the direct current voltage detectors are in signal connection with the rotor current bypass circuit so as to control switches of the fully controlled device. When a wind power generator is in power system failure and the intermediate direct current link has too high voltage, the fully controlled device is switched on to realize bypass for rotor current, thereby keeping continuous running of a grid-side frequency converter of a double-fed induction wind power generator and providing extremely strong support for failure recovery of a power grid.
Description
Technical field
The utility model relates to a kind of wind power generator frequency transformator, particularly a kind ofly carries out fast, control is simple, reliable, power consumption is lower and possess the double-fed wind power generator frequency converter of very strong low voltage ride-through capability.Belong to technical field of wind power generating equipment.
Background technology
Traditional energy atrophy day by day now, the whole world has started the upsurge of developing renewable resources.Wherein, wind energy becomes the outstanding person of tool industrialization development condition in the current new forms of energy, also is Future in China the most potential renewable and clean energy resource in the several years.By 2008, China's wind-powered electricity generation installation total capacity reached 1,221 ten thousand kilowatts, has accounted for 10% of global total installed capacity, ranks the whole world the 4th.Only 2008 1 year, the newly-increased wind-powered electricity generation installed capacity of China just reached 6,300,000 kilowatts, and new increment ranks the whole world the second, only is only second to 8,380,000 kilowatts of the U.S..Yet, in the electric power system during wind-force capacity of installed generator large percentage, after electric power system fault causes electric voltage dropping, the wind energy turbine set excision can have a strong impact on the stability of system's operation, this just requires the wind-powered electricity generation unit to possess low voltage ride-through capability, uninterruptedly is incorporated into the power networks to guarantee fault condition leeward group of motors.The comparatively advanced country of wind power technology has formulated the wind-electricity integration guide rule as Germany, the U.S. etc. according to the electrical network actual operating state, and the wind energy turbine set that inserts electrical network has been proposed strict specification requirement.This specification requirement generally comprises reactive power, active voltage control and low voltage ride-through capability etc., wherein the low voltage ride-through capability of wind-powered electricity generation unit is be incorporated into the power networks on a large scale essential condition and requirement of wind-powered electricity generation, is the externally assurance of electric network fault leeward group of motors with the ability of running without interruption.
The double-fed induction wind driven generator group is the mainstream model of at present domestic and international wind-powered electricity generation unit.For the double-fed fan motor unit, electrical network breaks down when causing the net electric voltage dropping, because the coupled relation between rotor and the stator, sharply the stator current that increases will cause the rapid increase of rotor current.Actual current times over the rotor rated current makes rotor side inverter close rapidly.But because the effect of rotor side inverter fly-wheel diode, busbar voltage can sharply increase.Though existing double-fed induction wind driven generator system all is back-to-back frequency converters, the situation that the inverter DC bus-bar voltage sharply raises still can appear between age at failure.Too high DC bus-bar voltage is with the grievous injury frequency converter.
Therefore, when electric network fault, necessary restrict rotor overcurrent of double-fed induction wind driven generator group and overvoltage of direct current are in order to avoid cause damage to the rotor-side frequency converter.Generator and frequency converter are protected in the measure of general use rotor current bypass under big value transient fault.In order to realize the measure of rotor current bypass, many now employing controllable silicons are as controlled switch.Use the measure of silicon controlled rotor current bypass that following defective is arranged: silicon-controlled device can not be realized controlled shutdown on the one hand; therefore to control device more entirely long its action cycle; restricted the realization of the control effect of whole double-fed induction wind driven generator group; even in application; controllable silicon is in conducting state when restarting inverter in order to avoid; need to detect whether electric current is zero in the controllable silicon loop, the complexity that had so both increased safeguard measure enforcement has also lowered the whole system reliability of operation.To bear dv/dt limited in one's ability for silicon-controlled device on the other hand, needs more absorption circuit, thereby increased equipment power dissipation, increased equipment cost, strengthened equipment volume.
Based on above-mentioned prior art situation, we are necessary to design a kind of electric generator frequency-converter of brand new, make it have the characteristics such as quick, that control is simple, reliable, power consumption is lower, low voltage ride-through capability is strong of carrying out.
The utility model content
Utility model purpose of the present utility model is to solve problems of the prior art, provides a kind of and carries out fast, control is simple, reliable, power consumption is lower and possess the double-fed wind power generator frequency converter of very strong low voltage ride-through capability.
Utility model purpose of the present utility model is achieved by following technical proposals:
The low-voltage traversing double-fed wind driven generator frequency converter comprises: stator side be incorporated into the power networks K switch M0, rotor-side frequency converter 105, intermediate dc link 106, net side frequency converter 107; The stator 101 of wind-driven generator inserts electrical network by this stator side K switch M0 that is incorporated into the power networks; The rotor 102 of wind-driven generator is connected and is inserted electrical network with described rotor-side frequency converter 105, intermediate dc link 106, net side frequency converter 107 orders; It is characterized in that:
Described intermediate dc link 106 includes dc capacitor C1 and dc voltage detector TV1; Described dc voltage detector TV1 is connected in parallel on the two ends of this dc capacitor C1, in order to detect the intermediate dc link voltage;
In this frequency converter, also be provided with rotor current bypass resistance 104; Described rotor current bypass resistance 104 by current-limiting resistance 200, three-phase not control rectifier 300, control the series connection of device V 1 order entirely and constitute; Described current-limiting resistance 200 ends are as the incoming end of electric current bypass resistance 104, and parallel connection is linked between described rotor 102 and the rotor-side frequency converter 105;
Described dc voltage detector 106 is connected with rotor current bypass resistance 104 signals, to control full control device V1 switch.
Described full control device V1 can adopt insulated gate bipolar power tube, integrated gate commutated thyristor or turn-off thyristor.
Be parallel with absorption circuit 500 at the two ends of described full control device V1.
Be not parallel with DC filter 400 in the two ends of control rectifier 300 at described three-phase.
Described absorption circuit 500 and DC filter 400 can adopt A type voltage clamping circuit, Type B voltage clamping circuit or C type voltage clamping circuit;
Described A type voltage clamping circuit by absorption diode with after absorption resistance is in parallel again with absorb capacitances in series and constitute;
Described Type B voltage clamping circuit is made of absorption resistance and absorption capacitances in series;
Described C type voltage clamping circuit absorbs electric capacity by one and constitutes.
In frequency converter, also be provided with rotor-side filter L2; This rotor-side filter L2 is connected between described rotor 102 and the rotor-side frequency converter 105; Described rotor current bypass resistance 104 can in parallelly insert between rotor 102 and the rotor-side filter L2 by incoming end current-limiting resistance 200, also can in parallelly insert between rotor-side filter L2 and the rotor-side frequency converter 105.
The beneficial effects of the utility model are: this wind-driven generator is during electric power system fault, the stator side of the having kept double-fed induction wind driven generator K switch M0 closure that is incorporated into the power networks, the continuous service that has kept the net side frequency converter of double-fed wind power generator frequency converter, restart the rotor-side frequency converter of double-fed wind power generator frequency converter with fast speeds, fault recovery to electrical network forms very strong support, possesses strong low voltage ride-through capability under the prerequisite of high reliability.
Description of drawings
Fig. 1 is the generator system schematic diagram that low-voltage traversing double-fed wind driven generator frequency converter and double-fed induction wind driven generator are formed;
Fig. 2 is the circuit structure diagram of this rotor current bypass resistance;
Fig. 3 (A) is an A type voltage clamping circuit circuit diagram;
Fig. 3 (B) is a Type B voltage clamping circuit circuit diagram;
Fig. 3 (C) is a C type voltage clamping circuit circuit diagram;
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
The generator system schematic diagram of Fig. 1 for forming by the utility model low-voltage traversing double-fed wind driven generator frequency converter and double-fed induction wind driven generator.As shown in the figure, wherein double-fed induction wind driven generator 100 is made up of stator 101 and rotor 102.And low-voltage traversing double-fed wind driven generator frequency converter comprises: stator side be incorporated into the power networks K switch M0, rotor-side filter L2, rotor-side frequency converter 105, intermediate dc link 106, net side frequency converter 107, net side commutating reactance L1, net side power network switch KM1.
Wherein, stator 101 inserts electrical network by the stator side K switch M0 that is incorporated into the power networks.Rotor 102 is by rotor-side filter L2 and rotor-side frequency converter 105, intermediate dc link 106, net side frequency converter 107, net side commutating reactance L1, the net side power network switch KM1 access electrical network of connecting in proper order.This net side power network switch KM1 is arranged between net side commutating reactance L1 and the electrical network, cuts out electrical network in order to control generator amature side input.
Said structure is the basic structure of existing double-fed wind power generator system.At when electrical network breaks down, the problem of too high DC bus-bar voltage meeting grievous injury frequency converter, in intermediate dc link 106, also be provided with dc voltage detector TV1 on the basis of this basic structure, in generator system, also adding rotor current bypass resistance 104 simultaneously.
Described intermediate dc link 106 includes dc capacitor C1 and dc voltage detector TV1.This dc voltage detector TV1 is connected in parallel on the dc capacitor C1 two ends of this intermediate dc link, in order to detect the voltage of intermediate dc link 106.
Described rotor current bypass resistance 104 can be connected in parallel between rotor 102 and the rotor-side filter L2, or between rotor-side filter L2 and the rotor-side frequency converter 105.This rotor current bypass resistance 104 is the specially designed bypass resistance of the utility model, and its structure is different with the general existing electric current bypass resistance that is adopted.Fig. 2 is the circuit structure diagram of this rotor current bypass resistance.As shown in the figure, this rotor current bypass resistance 104 is by current-limiting resistance 200, three-phase control rectifier 300 and control device V1 entirely and connect in proper order and constitute not.Wherein, these current-limiting resistance 200 ends are as the incoming end of electric current bypass resistance 104, and parallel connection is linked between aforementioned rotor 102 and the rotor-side filter L2, or between rotor-side filter L2 and the rotor-side frequency converter 105.
Described dc voltage detector TV1 is connected with rotor current bypass resistance 104 signals, and it is sent to rotor current bypass resistance 104 by detecting the judgement signal that dc tache voltage produced, full control device V1 is carried out switch control.
When electric power system fault caused electric voltage dropping, the stator current of double-fed induction wind driven generator 100 sharply increased.Because the coupled relation between rotor 102 and the stator 101, sharply the stator current that increases will cause the rapid increase of rotor current.Actual current times over the rotor rated current makes rotor side inverter close rapidly.But because the effect of rotor side inverter fly-wheel diode, busbar voltage can sharply increase.Though the double-fed induction wind driven generator frequency convertor system all is back-to-back frequency converters, but the situation that the inverter DC bus-bar voltage sharply raises can appear.When the voltage of middle DC link 106 surpassed certain threshold values C0, dc voltage detector TV1 sent the conducting order of full control device V1 in the rotor current bypass resistance.In the rotor current bypass resistance after the full control device V1 conducting, the current-limiting resistance 200, three-phase that the rotor current of double-fed induction wind driven generator flows through the rotor current bypass resistance not control rectifier 300, control device V1 entirely, and do not enter intermediate dc link 106.The lasting sharply rising of inverter DC bus-bar voltage can not appear in the double-fed induction wind driven generator frequency converter under the electric network fault situation like this, the stator side of the double-fed induction wind driven generator frequency converter K switch M0 that is incorporated into the power networks still remains closed, and keeps not off-grid of double fed induction generators.
When the voltage of middle DC link 106 is lower than certain threshold values C0, process is than short time delay, dc voltage detector TV1 cancels the conducting order of full control device V1 in the rotor current bypass resistance. because the self-characteristic of full control device V1, electric current in the rotor current bypass resistance 104 is controlled fully, at this moment restart the rotor-side frequency converter of double-fed induction wind driven generator frequency converter, sending the fault of idle support electrical network can recover. and restart the rotor-side frequency converter 105 of double-fed induction wind driven generator frequency converter like this in the short time, well supported the fault recovery of whole electrical network.
When the electric power system fault recovery moment, the rotor current of double-fed induction wind driven generator 100 sharply increases again.Because the coupled relation between rotor and the stator, sharply the stator current that increases will cause the rapid increase of rotor current.When the voltage of middle DC link 106 surpassed certain threshold values C0, dc voltage detector TV1 sent the conducting order of full control device V1 in the rotor current bypass resistance.In the rotor current bypass resistance after the full control device V1 conducting, the current-limiting resistance 200, three-phase that the rotor current of double-fed induction wind driven generator 100 flows through the rotor current bypass resistance not control rectifier 300, control device V1 entirely, and do not enter intermediate dc link 106.The lasting sharply rising of inverter DC bus-bar voltage can not appear in the double-fed induction wind driven generator frequency converter under the electric network fault situation like this.When the voltage of middle DC link was lower than certain threshold values C0, dc voltage detector TV1 cancelled the conducting order of full control device V1 in the rotor current bypass resistance.Restart the rotor-side frequency converter 105 of double-fed induction wind driven generator frequency converter in the short period of time, the double-fed induction wind driven generator frequency converter recovers operate as normal.
In fact, can be used as the such switch control assembly of full control device V1 has a lot.Specifically, can adopt switch control assemblies such as insulated gate bipolar power tube IGBT, integrated gate commutated thyristor IGCT or turn-off thyristor GTO as the described full control device V1 of this patent.
In addition,, turn-off in a flash, be easy to produce the spike burr of voltage at it because so full control device V1 turn-offs very fastly.Thereby need be parallel with exhausted absorption circuit 500 at the two ends of full control device V1, be operated in the area of safety operaton of himself to protect full control device V1.
Because so full control device V1 turn-offs very fastly, turn-off in a flash at it, be easy to produce the spike burr of voltage.Thereby also need not be parallel with DC filter 400 in the two ends of control rectifier 300 at three-phase, with the protection three-phase not control rectifier 300 be operated in the area of safety operaton of himself.
Here, described circuit 500 and the DC filter 400 of absorbing extremely all can adopt any in three kinds of voltage clamping circuits shown in Figure 3.Wherein, shown in Fig. 3 (A) is A type voltage clamping circuit, its by absorption diode with after absorption resistance is in parallel again with absorb capacitances in series and constitute.Shown in Fig. 3 (B) is the Type B voltage clamping circuit, and it is made of absorption resistance and absorption capacitances in series.Shown in Fig. 3 (C) is C type voltage clamping circuit, and it only absorbs electric capacity by one and constitutes.
In sum, the designed double-fed wind power generator of the utility model promptly is by using full control device V1 instead as the switch control assembly in rotor current bypass resistance 104, and is aided with the dc voltage detector TV1 that is arranged on the intermediate dc link 106 it is controlled.Thereby, make this wind-driven generator during electric power system fault, the stator side of the having kept double-fed induction wind driven generator K switch M0 closure that is incorporated into the power networks, the continuous service that has kept the net side frequency converter of double-fed induction wind driven generator frequency converter, restarted the rotor-side frequency converter of double-fed induction wind driven generator frequency converter with fast speeds, fault recovery to electrical network forms very strong support, possesses strong low voltage ride-through capability under the prerequisite of high reliability.
The above is preferred embodiment of the present utility model and the know-why used thereof; for a person skilled in the art; under the situation that does not deviate from spirit and scope of the present utility model; any based on conspicuous changes such as the equivalent transformation on the technical solutions of the utility model basis, simple replacements, all belong within the utility model protection range.
Claims (8)
1. low-voltage traversing double-fed wind driven generator frequency converter comprises: stator side be incorporated into the power networks switch (KM0), rotor-side frequency converter (105), intermediate dc link (106), net side frequency converter (107); The stator of wind-driven generator (101) inserts electrical network by this stator side switch (KM0) that is incorporated into the power networks; The rotor of wind-driven generator (102) is connected with described rotor-side frequency converter (105), intermediate dc link (106), net side frequency converter (107) order and is inserted electrical network; It is characterized in that:
Described intermediate dc link (106) includes dc capacitor (C1) and dc voltage detector (TV1); Described dc voltage detector (TV1) is connected in parallel on the two ends of this dc capacitor (C1), in order to detect the intermediate dc link voltage;
In this frequency converter, also be provided with rotor current bypass resistance (104); Described rotor current bypass resistance (104) by current-limiting resistance (200), three-phase not control rectifier (300), control device (V1) order series connection entirely and constitute; Described current-limiting resistance (200) end is as the incoming end of electric current bypass resistance (104), and parallel connection is linked between described rotor (102) and the rotor-side frequency converter (105);
Described dc voltage detector (106) is connected with rotor current bypass resistance (104) signal, to control full control device (V1) switch.
2. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 1 is characterized in that: described full control device (V1) can adopt insulated gate bipolar power tube, integrated gate commutated thyristor or turn-off thyristor.
3. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 1 is characterized in that: be parallel with absorption circuit (500) at the two ends of described full control device (V1).
4. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 3 is characterized in that: described absorption circuit (500) adopts A type voltage clamping circuit, Type B voltage clamping circuit or C type voltage clamping circuit;
Described A type voltage clamping circuit by absorption diode with after absorption resistance is in parallel again with absorb capacitances in series and constitute;
Described Type B voltage clamping circuit is made of absorption resistance and absorption capacitances in series;
Described C type voltage clamping circuit absorbs electric capacity by one and constitutes.
5. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 1 is characterized in that: be not parallel with DC filter (400) in the two ends of control rectifier (300) at described three-phase.
6. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 5 is characterized in that: described DC filter (400) adopts A type voltage clamping circuit, Type B voltage clamping circuit or C type voltage clamping circuit;
Described A type voltage clamping circuit by absorption diode with after absorption resistance is in parallel again with absorb capacitances in series and constitute;
Described Type B voltage clamping circuit is made of absorption resistance and absorption capacitances in series;
Described C type voltage clamping circuit absorbs electric capacity by one and constitutes.
7. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 1 is characterized in that: also be provided with rotor-side filter (L2) in frequency converter; This rotor-side filter (L2) is connected between described rotor (102) and the rotor-side frequency converter (105); Described rotor current bypass resistance (104) inserts between rotor (102) and the rotor-side filter (L2) by incoming end current-limiting resistance (200) is in parallel.
8. low-voltage traversing double-fed wind driven generator frequency converter as claimed in claim 1 is characterized in that: also be provided with rotor-side filter (L2) in frequency converter; This rotor-side filter (L2) is connected between described rotor (102) and the rotor-side frequency converter (105); Described rotor current bypass resistance (104) inserts between rotor-side filter (L2) and the rotor-side frequency converter (105) by incoming end current-limiting resistance (200) is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201094886U CN201466745U (en) | 2009-06-24 | 2009-06-24 | Low-voltage cross-over double-fed wind power generator frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201094886U CN201466745U (en) | 2009-06-24 | 2009-06-24 | Low-voltage cross-over double-fed wind power generator frequency converter |
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| Publication Number | Publication Date |
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| CN201466745U true CN201466745U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201094886U Expired - Lifetime CN201466745U (en) | 2009-06-24 | 2009-06-24 | Low-voltage cross-over double-fed wind power generator frequency converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871997A (en) * | 2010-06-18 | 2010-10-27 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| CN103855725A (en) * | 2012-12-04 | 2014-06-11 | 浙江海得新能源有限公司 | Converter topology and control method |
| TWI464990B (en) * | 2011-08-23 | 2014-12-11 | Delta Electronics Shanghai Co | A dc chopper of doubly fed induction generator system and dc chopping method thereof |
| WO2021169144A1 (en) * | 2020-02-29 | 2021-09-02 | 贵州电网有限责任公司 | Mgp new energy grid-connected control method and system |
-
2009
- 2009-06-24 CN CN2009201094886U patent/CN201466745U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871997A (en) * | 2010-06-18 | 2010-10-27 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| CN101871997B (en) * | 2010-06-18 | 2012-09-05 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| TWI464990B (en) * | 2011-08-23 | 2014-12-11 | Delta Electronics Shanghai Co | A dc chopper of doubly fed induction generator system and dc chopping method thereof |
| CN103855725A (en) * | 2012-12-04 | 2014-06-11 | 浙江海得新能源有限公司 | Converter topology and control method |
| CN103855725B (en) * | 2012-12-04 | 2016-06-15 | 浙江海得新能源有限公司 | A kind of wind electric converter topology and control method |
| WO2021169144A1 (en) * | 2020-02-29 | 2021-09-02 | 贵州电网有限责任公司 | Mgp new energy grid-connected control method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20100512 |