CN102386632A - Device and method for double-fed crowbar to pass through power grid fault - Google Patents
Device and method for double-fed crowbar to pass through power grid fault Download PDFInfo
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- CN102386632A CN102386632A CN2011103151071A CN201110315107A CN102386632A CN 102386632 A CN102386632 A CN 102386632A CN 2011103151071 A CN2011103151071 A CN 2011103151071A CN 201110315107 A CN201110315107 A CN 201110315107A CN 102386632 A CN102386632 A CN 102386632A
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a device and a method for a double-fed crowbar to pass through a power grid fault. The device comprises a control circuit, a detecting circuit and a Crowbar circuit; the Crowbar circuit comprises a rectifying circuit, a switch circuit and a driving circuit; the input end of the rectifying circuit is connected with the rotor end of a generator while the other end of the rectifying circuit is connected with the output end of the driving circuit by the switch circuit; the input end of the driving circuit is connected with the output end of the control circuit; and the switch circuit comprises a totally-controlled power electronic device. The voltage endurance capability of the totally-controlled device can be improved, namely, when a high voltage is generated in the input end of the Crowbar circuit, the high voltage can be shared evenly by multiple totally-controlled power electronic devices in a series connection module so as to prevent a unit from being departed from the power grid caused by the burned Crowbar circuit because of overvoltage; consequently, work reliability and service life of the Crowbar circuit can be improved, synchronization time of a wind power generator is increased and stability of the power grid is guaranteed.
Description
Technical field
The present invention relates to the device and method that a kind of double-fed fan motor current transformer passes through electric network fault, particularly a kind of device and method of tackling the wind turbine generator protection that the line voltage short time falls.Be mainly used in the crow bar crowbar circuit that low-voltage is passed through in the wind generator system.
Background technology
Advocate today of green energy resource in the world, wind power generation has obtained swift and violent development as a kind of reproducible new forms of energy, and wind power generation proportion in mains supply improves constantly.In running, electric network fault may cause electric voltage dropping, and this can cause wind power plant to occur phenomenons such as overvoltage, overcurrent or rotating speed rising in short-term, makes a large amount of wind-driven generator off-grids, makes the stability of power system variation.Therefore, the be incorporated into the power networks quality and the running status of wind turbine generator is stable most important.
Based on the wind turbine generator of double-fed current transformer, control the power of complete machine through controlling rotor current, stator directly is connected electrical network.When line voltage fell, overvoltage, overcurrent can appear in its rotor-end, and the DC bus-bar voltage that connects net side converter and pusher side current transformer is raise; This safety to current transformer constitutes a serious threat; As do not take measures, can cause current transformer to damage, reduce the stability of electrical network.
In order to solve the appeal problem; Need to introduce the low-voltage crossing technology (being called for short LVRT, Low Voltage Ride Through) of wind power plant, that is: electric network fault causes electric voltage dropping; Wind energy turbine set is when electrical network breaks down and after the fault, the ability that keeps off-grid not to be incorporated into the power networks continuously.Existing technology adopts passive type crowbar circuitry means; Usually form by diode rectifier bridge and thyristor; Diode rectifier bridge is output into direct current with the rotor three-phase, the thyristor that in needs, sets out, and release energy to realize the protection to current transformer through power consumption resistance.
But closing of thyristor can only rely on reverse voltage, and its reverse voltage is produced by external circuit; After this crowbar circuit triggers; Need break off generator unit stator from electrical network, and exhaust the back to rotor energy and realize closing, this makes generator can not realize continuous operation; Produce electric network fault, pass through function so this device can not be accomplished the low-voltage of wind-powered electricity generation unit.
In order to address the above problem; Active crowbar circuit has appearred; Its principle is to change the thyristor of passive type crowbar circuit into all-controlling power electronics device, and when line voltage fell, the controller side converter was closed; Open the crowbar circuit simultaneously, fall generator amature side energy consumption.When line voltage recovered, control crowbar circuit was closed, and opens the pusher side current transformer, to electrical network idle support is provided, and helps the fast quick-recovery of electrical network, and the realization low-voltage is passed through function.
But still there is defective in above-mentioned active crowbar circuit.When crowbar transfers to when closing by opening,, damage all-controlling power electronics device easily because the existence of motor inductance makes the crowbar input produce high pressure.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention will design a kind of functional reliability and the useful life that can improve active crowbar circuit, guarantees that the double-fed fan motor current transformer of the stability of line voltage passes through the device and method of electric network fault.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of double-fed fan motor current transformer passes through the device of electric network fault; Comprise control circuit, testing circuit and crowbar circuit, the input of described control circuit through testing circuit be connected with the net side converter, its output is connected with the pusher side current transformer through the crowbar circuit;
The input of described crowbar circuit is connected with the generator amature end with the pusher side current transformer respectively; Described crowbar circuit comprises rectification circuit, switching circuit and drive circuit; The input of described rectification circuit is connected with the generator amature end, the other end is connected with the output of drive circuit through switching circuit, and the input of drive circuit is connected with the output of control circuit; Described switching circuit comprises all-controlling power electronics device.
Switching circuit of the present invention comprises single all-controlling power electronics device.
Switching circuit of the present invention comprises a plurality of circuit modules, and described circuit module comprises the all-controlling power electronics device of single all-controlling power electronics device or a plurality of mutual series connection, and described a plurality of circuit modules are connected in parallel.
Rectification circuit of the present invention is made up of half-wave rectifying circuit or full-wave rectifying circuit that rectification module constitutes, and the input of rectification circuit is connected with pusher side current transformer, generator amature side, and its output is connected with switching circuit.
Crowbar circuit of the present invention comprises the inverse parallel diode that is connected the power consumption resistance on switching circuit input or output or the input/output terminal and is connected in parallel on power consumption resistance two ends.
Crowbar circuit of the present invention comprises equalizer circuit, and said equalizer circuit is connected with crowbar circuit input end, output and neutral point respectively.
A kind of double-fed fan motor current transformer passes through the method for electric network fault, may further comprise the steps:
A, when crowbar circuit turn-on threshold value that electric network electric voltage drop causes double-fed current transformer generator rotor current or DC bus-bar voltage to rise to being equal to or greater than setting; Control circuit closure plane side converter also triggers the crowbar circuit, makes the switching circuit conducting in the crowbar circuit;
B, when the rotor current of double-fed current transformer generator decay to the crowbar circuit shutoff door limit value that is equal to or less than setting, when grid side voltage recovers normal condition; Control circuit turn-offs the crowbar circuit makes the switching circuit in the crowbar circuit turn-off and open the pusher side current transformer; For electrical network provides idle support rapidly, help power system restoration.
The invention has the beneficial effects as follows:
1. switching circuit of the present invention adopts all-controlling power electronics device as composed component, and two or more said elements are connected as a circuit module, two or more modules and the switching circuit that is unified into.Adopt this mode can improve the voltage endurance capability of full-control type device; Promptly when the Crowbar circuit input end produces high pressure; A plurality of all-controlling power electronics devices in the serial module structure are shared out equally thus, have reduced the suffered voltage of single all-controlling power electronics device, the off-grid of the unit that the Crowbar circuit burnout that has prevented to cause owing to overvoltage causes; The reliability and the useful life of Crowbar circuit working have been improved; Increase being incorporated into the power networks the time of wind-driven generator, and when electric network fault, electrical network has been provided strong support, guaranteed the stability of electrical network.
2. crowbar circuit of the present invention comprises equalizer circuit, and the voltage of bridge is impartial up and down to adopt sort circuit to carry to make switching circuit, has avoided making owing to voltage is unequal the harm of switching circuit damage.
3. the present invention is simple in structure, and is easy to implement.
Description of drawings
4 in the total accompanying drawing of the present invention, wherein:
Fig. 1 is the double-fed converter system sketch map that the double-fed current transformer of configuration the present invention passes through the electric network fault device.
Fig. 2 is the structural representation that the double-fed current transformer of the present invention passes through the electric network fault device.
Fig. 3 is the circuit diagram of switching circuit embodiment one in the double-fed current transformer of the present invention.
Fig. 4 is the circuit diagram of switching circuit embodiment two in the double-fed current transformer of the present invention.
Among the figure, 10, the crowbar circuit, 20, control circuit, 30, the pusher side current transformer; 40, net side converter, 50, testing circuit, 60, double-fed current transformer generator, 101, drive circuit; 201, switching circuit, 301, power consumption resistance, 401, rectification circuit, 501, grading resistor.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.As shown in Figure 1; A kind of double-fed fan motor current transformer passes through the device of electric network fault; Comprise control circuit 20, testing circuit 50 and crowbar circuit 10, the input of described control circuit 20 through testing circuit 50 be connected with net side converter 40, its output is connected with pusher side current transformer 30 through crowbar circuit 10; The input of described crowbar circuit 10 is connected with the generator amature end with pusher side current transformer 30 respectively; Described crowbar circuit 10 comprises rectification circuit 401, switching circuit 201 and drive circuit 101; The input of described rectification circuit 401 is connected with the generator amature end, the other end is connected through the output of switching circuit 201 with drive circuit 101, and the input of drive circuit 101 is connected with the output of control circuit 20; Described switching circuit 201 comprises all-controlling power electronics device.Described switching circuit 201 comprises single all-controlling power electronics device.Described switching circuit 201 comprises two all-controlling power electronics devices, and two all-controlling power electronics device serial or parallel connections connect.Described switching circuit 201 comprises a plurality of circuit modules, and described circuit module comprises the all-controlling power electronics device of single all-controlling power electronics device or a plurality of mutual series connection, and described a plurality of circuit modules are connected in parallel.Described rectification circuit 401 is made up of half-wave rectifying circuit 401 or full-wave rectifying circuit 401 that rectification module constitutes, and the input of rectification circuit 401 is connected with pusher side current transformer 30, generator amature side, and its output is connected with switching circuit 201.Described crowbar circuit 10 comprises the inverse parallel diode that is connected the power consumption resistance 301 on switching circuit 201 inputs or output or the input/output terminal and is connected in parallel on power consumption resistance 301 two ends.Described crowbar circuit 10 comprises equalizer circuit, and said equalizer circuit is connected with crowbar circuit 10 inputs, output and neutral point respectively.Described all-controlling power electronics device comprises IGBT or IGCT.
A kind of double-fed fan motor current transformer passes through the method for electric network fault, may further comprise the steps:
A, when electric network electric voltage drop causes double-fed current transformer generator 60 rotor currents or DC bus-bar voltage to rise to crowbar circuit 10 conduction threshold that are equal to or greater than setting; Control circuit 20 closure plane side converters 30 also trigger crowbar circuit 10, make switching circuit 201 conductings in the crowbar circuit 10;
B, when the rotor current of double-fed current transformer generator 60 decay to the crowbar circuit 10 shutoff door limit values that are equal to or less than setting, when grid side voltage recovers normal condition; Control circuit 20 turn-offs crowbar circuit 10 makes the switching circuit 201 in the crowbar circuit 10 turn-off and open pusher side current transformer 30; For electrical network provides idle support rapidly, help power system restoration.
Through embodiment the present invention is further specified below.
Embodiment one
Like Fig. 1, shown in Figure 2, double-fed current transformer of the present invention passes through the electric network fault device and comprises control circuit 20 and crowbar circuit 10.Control circuit 20 is connected with the crowbar circuit with double-feed current transformer pusher side current transformer 30, net side converter 40.The input of crowbar circuit 10 is connected with pusher side current transformer 30.
As shown in Figure 2, crowbar circuit 10 comprises drive circuit 101, switching circuit 201, power consumption resistance 301, rectification circuit 401 and grading resistor 501.Drive circuit 101 drives with switching circuit 201 and is connected, and power consumption resistance 301 is connected between switching circuit 201 and the rectification circuit 401, and rectification circuit 401 is connected with pusher side current transformer 30, generator amature end.
As shown in Figure 2; Switching circuit 201 can adopt and comprise the series-parallel circuit of being made up of all-controlling power electronics device IGBT, IGCT etc.; The drive end of each all-controlling power electronics device all is connected with the control end of drive circuit 101, realizes conducting, shutoff control to all-controlling power electronics device.
As shown in Figure 4, power consumption resistance also can be connected the output of switching circuit 201.
When line voltage falls fault; When control circuit 20 detects generator rotor current or DC bus-bar voltage and rises to crowbar circuit 10 conduction threshold that are equal to or greater than setting; 201 conductings of control Driver Circuit 101 driving switch circuit; And closure plane side converter 40, pusher side current transformer 40 is protected; When the rotor current of double-fed current transformer generator 60 decay to the crowbar circuit 10 shutoff door limit values that are equal to or less than setting, when grid side voltage recovers normal condition; Control circuit 20 control Driver Circuit 101 stopcock circuit 201; And unlatching pusher side current transformer 40; For electrical network provides the acrobatic skill support rapidly, help power system restoration.
As shown in Figure 3; Power consumption resistance 301 1 ends connect the output of rectification circuit 401; The other end is connected with the input of switching circuit 201, and the output of switching circuit 201 is connected with the output that connects rectification circuit 401, and grading resistor 501 is connected with input, output and the neutral point of switching circuit 201.
As shown in Figure 4, the difference of itself and Fig. 3 is that power consumption resistance 301 is connected switching circuit 201 outputs and is connected with rectification circuit 401 outputs.
Embodiment two
Present embodiment and embodiment one are basic identical, and difference is that present embodiment is not provided with testing circuit 50.
When Crowbar circuit 10 was not provided with testing circuit 50, turning on and off through following mode of switching circuit 201 realized:
When line voltage fell fault, it was that symmetry is fallen or asymmetric falling that control circuit 20 detection of grid are fallen fault, when electric network fault is a symmetry when falling, and 201 conductings of control circuit 20 control Driver Circuit 101 driving switch circuit; (this time T is according to current transformer and generator system parameter setting during more than or equal to setting-up time T when switching circuit 201 ON times; Its basic theories is: but when the electric current of Crowbar circuit 10 is reduced to the shutoff door limit value of switching circuit 201; Can close its enforcement), control circuit 20 control Driver Circuit 101 stopcock circuit 201.
When electric network fault is asymmetric falling, 201 conductings of control circuit 20 control Driver Circuit 101 driving switch circuit; When switching circuit 201 ON times more than or equal to setting-up time T and when control circuit 20 detects the unbalanced source voltage degree and is equal to or less than the degree of unbalance set point (in the three-phase electricity electric power system; The degree of imbalance of three-phase voltage; Root mean square value percentage with electrical network voltage negative preface component and positive sequence component is represented), control circuit 20 control Driver Circuit 101 stopcock circuit 201.
Double-fed fan motor current transformer among the present invention passes through the device and method of electric network fault with the circuit structure of simple optimizing and the LVRT control that has realized double-feed current transformer with the circuit structure and the control strategy of simple optimizing; Can increase the time that wind-driven generator is incorporated into the power networks; And when electric network fault, electrical network is provided strong support, strengthened the stability of electrical network.
Claims (7)
1. a double-fed fan motor current transformer passes through the device of electric network fault; Comprise control circuit (20), testing circuit (50) and crowbar circuit (10), the input of described control circuit (20) through testing circuit (50) be connected with net side converter (40), its output is connected with pusher side current transformer (30) through crowbar circuit (10);
The input of described crowbar circuit (10) is connected with the generator amature end with pusher side current transformer (30) respectively; It is characterized in that: described crowbar circuit (10) comprises rectification circuit (401), switching circuit (201) and drive circuit (101); The input of described rectification circuit (401) is connected with the generator amature end, the other end is connected through the output of switching circuit (201) with drive circuit (101), and the input of drive circuit (101) is connected with the output of control circuit (20); Described switching circuit (201) comprises all-controlling power electronics device.
2. a kind of double-fed fan motor current transformer according to claim 1 passes through the device of electric network fault, it is characterized in that: described switching circuit (201) comprises single all-controlling power electronics device.
3. a kind of double-fed fan motor current transformer according to claim 1 passes through the device of electric network fault; It is characterized in that: described switching circuit (201) comprises a plurality of circuit modules; Described circuit module comprises the all-controlling power electronics device of single all-controlling power electronics device or a plurality of mutual series connection, and described a plurality of circuit modules are connected in parallel.
4. a kind of double-fed fan motor current transformer according to claim 1 passes through the device of electric network fault; It is characterized in that: half-wave rectifying circuit (401) or full-wave rectifying circuit (401) that described rectification circuit (401) is made up of rectification module are formed; The input of rectification circuit (401) is connected with pusher side current transformer (30), generator amature side, and its output is connected with switching circuit (201).
5. a kind of double-fed fan motor current transformer according to claim 1 passes through the device of electric network fault, it is characterized in that: described crowbar circuit (10) comprises the power consumption resistance (301) that is connected on switching circuit (201) input or output or the input/output terminal and is connected in parallel on the inverse parallel diode at power consumption resistance (301) two ends.
6. a kind of double-fed fan motor current transformer according to claim 1 passes through the device of electric network fault; It is characterized in that: described crowbar circuit (10) comprises equalizer circuit, and said equalizer circuit is connected with crowbar circuit (10) input, output and neutral point respectively.
7. method that the double-fed fan motor current transformer passes through electric network fault is characterized in that: may further comprise the steps:
A, when crowbar circuit (10) conduction threshold that electric network electric voltage drop causes double-fed current transformer generator (60) rotor current or DC bus-bar voltage to rise to being equal to or greater than setting; Control circuit (20) closure plane side converter (30) also triggers crowbar circuit (10), makes switching circuit (201) conducting in the crowbar circuit (10);
B, when the rotor current of double-fed current transformer generator (60) decay to crowbar circuit (10) the shutoff door limit value that is equal to or less than setting, when grid side voltage recovers normal condition; Control circuit (20) turn-offs crowbar circuit (10) makes the switching circuit (201) in the crowbar circuit (10) turn-off and open pusher side current transformer (30); For electrical network provides idle support rapidly, help power system restoration.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103151071A CN102386632A (en) | 2011-10-17 | 2011-10-17 | Device and method for double-fed crowbar to pass through power grid fault |
| CN2012103914316A CN102904280A (en) | 2011-10-17 | 2012-10-16 | Device and method for traversing grid fault by double-fed wind power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103151071A CN102386632A (en) | 2011-10-17 | 2011-10-17 | Device and method for double-fed crowbar to pass through power grid fault |
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| CN102386632A true CN102386632A (en) | 2012-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103151071A Pending CN102386632A (en) | 2011-10-17 | 2011-10-17 | Device and method for double-fed crowbar to pass through power grid fault |
| CN2012103914316A Pending CN102904280A (en) | 2011-10-17 | 2012-10-16 | Device and method for traversing grid fault by double-fed wind power converter |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012103914316A Pending CN102904280A (en) | 2011-10-17 | 2012-10-16 | Device and method for traversing grid fault by double-fed wind power converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103337871A (en) * | 2013-04-16 | 2013-10-02 | 许继集团有限公司 | Wind generating set low voltage ride through circuit and corresponding control method |
| CN104701817A (en) * | 2013-12-09 | 2015-06-10 | 山洋电气株式会社 | Motor control device |
| CN109120197A (en) * | 2017-06-23 | 2019-01-01 | 中国电力工程顾问集团华东电力设计院有限公司 | Double feedback electric engine frequency conversion speed-adjusting system based on current source converter |
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| DE102006053367A1 (en) * | 2006-11-10 | 2008-05-21 | Repower Systems Ag | Method and device for operating an inverter, in particular for wind energy installations |
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2011
- 2011-10-17 CN CN2011103151071A patent/CN102386632A/en active Pending
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2012
- 2012-10-16 CN CN2012103914316A patent/CN102904280A/en active Pending
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| CN103337871A (en) * | 2013-04-16 | 2013-10-02 | 许继集团有限公司 | Wind generating set low voltage ride through circuit and corresponding control method |
| CN104701817A (en) * | 2013-12-09 | 2015-06-10 | 山洋电气株式会社 | Motor control device |
| CN104701817B (en) * | 2013-12-09 | 2018-09-11 | 山洋电气株式会社 | Motor control assembly |
| CN109120197A (en) * | 2017-06-23 | 2019-01-01 | 中国电力工程顾问集团华东电力设计院有限公司 | Double feedback electric engine frequency conversion speed-adjusting system based on current source converter |
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| CN110247558A (en) * | 2018-03-09 | 2019-09-17 | 深圳市禾望电气股份有限公司 | A kind of current transformer fault handling method, readable storage medium storing program for executing and current transformer |
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| CN109546656A (en) * | 2018-11-07 | 2019-03-29 | 姜田贵 | A kind of energy consumption branch and control method |
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| CN102904280A (en) | 2013-01-30 |
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Application publication date: 20120321 |