CN102904280A - Device and method for traversing grid fault by double-fed wind power converter - Google Patents
Device and method for traversing grid fault by double-fed wind power converter Download PDFInfo
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- CN102904280A CN102904280A CN2012103914316A CN201210391431A CN102904280A CN 102904280 A CN102904280 A CN 102904280A CN 2012103914316 A CN2012103914316 A CN 2012103914316A CN 201210391431 A CN201210391431 A CN 201210391431A CN 102904280 A CN102904280 A CN 102904280A
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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 traversing a grid fault by a double-fed wind power converter. The device comprises a control circuit and a Crowbar circuit; the Crowbar circuit comprises a rectifying circuit, an energy-consuming circuit, a switching circuit and a drive circuit; the input end of the rectifying circuit is connected with a rotor end of a generator; the output end of the rectifying circuit has two interfaces; one interface is connected with the switching circuit through the energy-consuming circuit; the other interface is directly connected with the switching circuit; and the switching circuit at least comprises two full-control power electronic devices which are connected in series. By adopting the circuit, the full-control power electronic devices are effectively protected by reducing the withstand voltage loaded by a single full-control power electronic device; the offline of a machine unit caused by the burnout of the Crowbar circuit because of an over-voltage is prevented; the working reliability of the Crowbar circuit is improved and the service life of the Crowbar circuit is prolonged; the grid-connecting time of a wind-driven generator is increased; and the stability of the power grid is ensured.
Description
Technical field
The present invention relates to the device and method that a kind of double-fed wind energy converter 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 of low voltage crossing 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 voltage to fall, and this can cause wind power plant the phenomenons such as overvoltage, overcurrent or rise of rotational speed to occur in short-term, makes a large amount of wind-driven generator off-grids, makes the stability of power system variation.Therefore, 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 by controlling rotor current, stator directly is connected to electrical network.When line voltage fell, overvoltage, overcurrent can appear in its rotor-end, and the DC bus-bar voltage of connection network side converter and pusher side current transformer is raise, this safety to current transformer constitutes a serious threat, as not taking 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 that voltage falls, 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 formed by diode rectifier bridge and thyristor; diode rectifier bridge is output into direct current with the rotor three-phase, triggers thyristor in needs, and releases energy to realize protection to current transformer by energy consumption resistor.
But, closing of thyristor can only rely on reverse voltage, its reverse voltage is produced by external circuit, after this Crowbar circuit triggers, need to disconnect generator unit stator from electrical network, and rotor energy is exhausted rear realization close, this is so that generator can not be realized continuous operation, this device produces electric network fault, so can not be finished the low voltage ride-through function of wind-powered electricity generation unit.
In order to address the above problem, active Crowbar circuit has appearred, its principle is that the thyristor of passive type Crowbar circuit is changed into all-controlling power electronics device, when line voltage falls, the controller side converter is closed, open simultaneously the Crowbar circuit, generator amature side energy is consumed.When line voltage recovered, control Crowbar circuit was closed, and the uncapping machine side converter, provides reactive power support to electrical network, helps the fast quick-recovery of electrical network, realizes low voltage ride-through function.
But still there is defective in above-mentioned active Crowbar circuit.When Crowbar transfers to when closing by opening, because the existence of motor inductance so that the Crowbar input produces the high pressure spike, damages all-controlling power electronics device easily.
Summary of the invention
The problems referred to above that exist for solving prior art, the present invention will design a kind of functional reliability and useful life of improving active Crowbar circuit, guarantees that the double-fed wind energy converter of the stability of line voltage passes through the device and method of electric network fault.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of double-fed wind energy converter passes through the device of electric network fault, described double-fed wind energy converter comprises net side converter and pusher side current transformer, described net side converter links to each other with electrical network, described pusher side current transformer links to each other with generator, is connected by dc bus between described net side converter and the described pusher side current transformer;
The described device that passes through electric network fault comprises control circuit and Crowbar circuit, described control circuit is connected with the Crowbar circuit with net side converter, pusher side current transformer respectively and is connected, and described Crowbar circuit is connected on the electric wire between pusher side current transformer and the generator;
Described Crowbar circuit comprises rectification circuit, power consumption circuit, switching circuit and drive circuit, the input of described rectification circuit is connected with the generator amature end, the output of rectification circuit has two interfaces, and circuit is connected with switching circuit one of them interface through consuming energy, another interface directly is connected with switching circuit; Described switching circuit is connected with the output of drive circuit, and the input of drive circuit is connected with the output of control circuit; Described switching circuit comprises the all-controlling power electronics device of two series connection at least.
Switching circuit of the present invention is made of at least two parallel circuits module series connection, and described parallel circuits module is made of at least two all-controlling power electronics device parallel connections.
Switching circuit of the present invention is formed in parallel by at least two series circuit modules, and described series circuit module is made of at least two all-controlling power electronics device series connection.
A kind of double-fed wind energy converter passes through the method for the device of electric network fault, may further comprise the steps:
A, when line voltage falls the Crowbar circuit turn-on threshold value that 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 simultaneously conducting of series connection all-controlling power electronics device in the switching circuit 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, series connection all-controlling power electronics device in the switching circuit in the Crowbar circuit is turn-offed simultaneously, and uncapping machine side converter, for electrical network provides rapidly reactive power support, help power system restoration.
The invention has the beneficial effects as follows:
Switching circuit of the present invention adopts all-controlling power electronics device as composed component, and two or more all-controlling power electronics devices carry out serial or parallel connection as a circuit module, and two or more module serial or parallel connections form switching circuit.Adopt this mode; by reducing withstand voltage that single all-controlling power electronics device bears; effectively protected all-controlling power electronics device; the off-grid of the unit that the Crowbar circuit burnout that has prevented from causing owing to overvoltage causes; 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.
Description of drawings
7 in the total accompanying drawing of the present invention, wherein:
Fig. 1 is the double-fed current transformer schematic diagram 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 that switching circuit of the present invention is the circuit diagram of two all-controlling power electronics device series connection.
Fig. 4 is that switching circuit of the present invention is the circuit diagram of a plurality of all-controlling power electronics device series connection.
Fig. 5 is that switching circuit of the present invention is the circuit diagram of two parallel circuits module series connection.
Fig. 6 is that switching circuit of the present invention is the circuit diagram of a plurality of parallel circuits module series connection.
Fig. 7 is that switching circuit of the present invention is the circuit diagram of a plurality of series circuit module parallel connection.
Among the figure: 10, Crowbar circuit, 20, control circuit, 30, the net side converter, 40, the pusher side current transformer, 50, electrical network, 60, double-fed current transformer generator, 101, drive circuit, 201, switching circuit, 202, parallel circuits module, 203, series circuit module, 301, the power consumption circuit, 401, rectification circuit.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.Shown in Fig. 1-2, a kind of double-fed wind energy converter passes through the device of electric network fault, described double-fed wind energy converter comprises net side converter 30 and pusher side current transformer 40, described net side converter 30 links to each other with electrical network 50, described pusher side current transformer 40 links to each other with generator 60, is connected by dc bus between described net side converter 30 and the described pusher side current transformer 40;
The described device that passes through electric network fault comprises control circuit 20 and Crowbar circuit 10, described control circuit 20 is connected two-way the connection with net side converter 30, pusher side current transformer 40 and Crowbar circuit respectively, and described Crowbar circuit 10 is connected on the electric wire between pusher side current transformer 40 and the generator 60;
Described Crowbar circuit 10 comprises rectification circuit 401, power consumption circuit 301, switching circuit 201 and drive circuit 101, the input of described rectification circuit 401 is connected with generator 60 rotor-end, the output of rectification circuit 401 has two interfaces, and circuit 301 is connected with switching circuit 201 one of them interface through consuming energy, another interface directly is connected with switching circuit 201; Described switching circuit 201 is connected with the output of drive circuit 101, and the input of drive circuit 101 is connected with the output of control circuit 20; Described switching circuit 201 comprises the all-controlling power electronics device of two series connection at least.
A kind of double-fed wind energy converter passes through the method for the device of electric network fault, may further comprise the steps:
A, fall when causing double-fed current transformer generator 60 rotor currents or DC bus-bar voltage to rise to Crowbar circuit 10 conduction threshold that is equal to or greater than setting when electrical network 50 voltages, control circuit 20 closure plane side converters 40 also trigger Crowbar circuit 10, make the simultaneously conducting of series connection all-controlling power electronics device in the switching circuit 201 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 electrical network 50 side voltages recover normal condition, control circuit 20 turn-offs Crowbar circuit 10, series connection all-controlling power electronics device in the switching circuit 201 in the Crowbar circuit 10 is turn-offed simultaneously, and uncapping machine side converter 40, for electrical network provides rapidly reactive power support, help power system restoration.
The LVRT control that the device and method that double-fed wind energy converter among the present invention passes through electric network fault has been realized double-feed current transformer with 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.
Embodiment below by switching circuit further specifies the present invention.
Embodiment one:
As shown in Figure 3, switching circuit 201 is made of two all-controlling power electronics device series connection.
As shown in Figure 4, switching circuit 201 is made of plural all-controlling power electronics device series connection.
When electrical network 50 voltages fall when causing double-fed current transformer generator 60 rotor currents or DC bus-bar voltage to rise to Crowbar circuit 10 conduction threshold that is equal to or greater than setting, control circuit 20 closure plane side converters 40 also trigger Crowbar circuit 10, make the simultaneously conducting of series connection all-controlling power electronics device in the switching circuit 201 in the Crowbar circuit 10; 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 electrical network 50 voltages recover normal condition, control circuit 20 turn-offs Crowbar circuit 10, series connection all-controlling power electronics device in the switching circuit 201 in the Crowbar circuit 10 is turn-offed simultaneously, and uncapping machine side converter 40, for electrical network 50 provides rapidly reactive power support, help electrical network 50 to recover.
Embodiment two:
As shown in Figure 5, switching circuit 201 is made of 202 series connection of two parallel circuits modules, and each parallel circuits module 202 is made of a plurality of all-controlling power electronics device parallel connections.
As shown in Figure 6, switching circuit 201 is made of plural parallel circuits module 202 series connection, and each parallel circuits module 202 is made of a plurality of all-controlling power electronics device parallel connections.
When electrical network 50 voltages fall when causing double-fed current transformer generator 60 rotor currents or DC bus-bar voltage to rise to Crowbar circuit 10 conduction threshold that is equal to or greater than setting, control circuit 20 closure plane side converters 40 also trigger Crowbar circuit 10, make the simultaneously conducting of all-controlling power electronics device in all the parallel circuits modules 202 in the switching circuit 201 in the Crowbar circuit 10; 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 electrical network 50 voltages recover normal condition, control circuit 20 turn-offs Crowbar circuit 10, all-controlling power electronics device in all parallel circuits modules 202 in the switching circuit 201 in the Crowbar circuit 10 is turn-offed simultaneously, and uncapping machine side converter 40, for electrical network 50 provides rapidly reactive power support, help electrical network 50 to recover.
Embodiment three:
As shown in Figure 7, switching circuit 201 is made of plural series circuit module 203 parallel connections, and each series circuit module 203 is made of a plurality of all-controlling power electronics device series connection.
When electrical network 50 voltages fall when causing double-fed current transformer generator 60 rotor currents or DC bus-bar voltage to rise to Crowbar circuit 10 conduction threshold that is equal to or greater than setting, control circuit 20 closure plane side converters 40 also trigger Crowbar circuit 10, make the simultaneously conducting of all-controlling power electronics device in all the series circuit modules 203 in the switching circuit 201 in the Crowbar circuit 10; 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 electrical network 50 voltages recover normal condition, control circuit 20 turn-offs Crowbar circuit 10, all-controlling power electronics device in all series circuit modules 203 in the switching circuit 201 in the Crowbar circuit 10 is turn-offed simultaneously, and uncapping machine side converter 40, for electrical network 50 provides rapidly reactive power support, help electrical network 50 to recover.
Claims (4)
1. a double-fed wind energy converter passes through the device of electric network fault, described double-fed wind energy converter comprises net side converter (30) and pusher side current transformer (40), described net side converter (30) links to each other with electrical network (50), described pusher side current transformer (40) links to each other with generator (60), is connected by dc bus between described net side converter (30) and the described pusher side current transformer (40); The described device that passes through electric network fault comprises control circuit (20) and Crowbar circuit (10), described control circuit (20) is connected 10 with net side converter (30), pusher side current transformer (40) with the Crowbar circuit respectively) the two-way connection, described Crowbar circuit (10) is connected on the electric wire between pusher side current transformer (40) and the generator (60);
It is characterized in that: described Crowbar circuit (10) comprises rectification circuit (401), power consumption circuit (301), switching circuit (201) and drive circuit (101), the input of described rectification circuit (401) is connected with generator (60) rotor-end, the output of rectification circuit (401) has two interfaces, and circuit (301) is connected with switching circuit (201) one of them interface through consuming energy, another interface directly is connected with switching circuit (201); Described switching circuit (201) is connected with the output of drive circuit (101), and the input of drive circuit (101) is connected with the output of control circuit (20); Described switching circuit (201) comprises the all-controlling power electronics device of two series connection at least.
2. a kind of double-fed wind energy converter according to claim 1 passes through the device of electric network fault, it is characterized in that: described switching circuit (201) is made of at least two parallel circuits modules (202) series connection, and described parallel circuits module (202) is made of at least two all-controlling power electronics device parallel connections.
3. a kind of double-fed wind energy converter according to claim 1 passes through the device of electric network fault, it is characterized in that: described switching circuit (201) is formed in parallel by at least two series circuit modules (203), and described series circuit module (203) is made of at least two all-controlling power electronics device series connection.
4. a kind of double-fed wind energy converter according to claim 1 method of passing through the device of electric network fault is characterized in that: may further comprise the steps:
A, when electrical network (50) voltage falls Crowbar circuit (10) conduction threshold that 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 (40) also triggers Crowbar circuit (10), makes the simultaneously conducting of series connection all-controlling power electronics device in the switching circuit (201) 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 electrical network (50) side voltage recovers normal condition, control circuit (20) turn-offs Crowbar circuit (10), series connection all-controlling power electronics device in the switching circuit (201) in the Crowbar circuit (10) is turn-offed simultaneously, and uncapping machine side converter (40), for electrical network provides rapidly reactive power support, help power system restoration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103914316A 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 | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110315107.1 | 2011-10-17 | ||
| 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 |
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| CN102904280A true CN102904280A (en) | 2013-01-30 |
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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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| CN2011103151071A Pending 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298121A (en) * | 2013-07-15 | 2015-01-21 | 哈尔滨工业大学（威海） | Doubly-fed wind power generation system simulation experiment platform for control technology research |
| CN104638878A (en) * | 2013-11-07 | 2015-05-20 | 艾默生网络能源有限公司 | Signal transmission method, signal transmission device, signal analysis method, signal analysis device, signal transmission circuit, and converter system |
| CN108767903A (en) * | 2018-06-29 | 2018-11-06 | 国家电网有限公司 | Become resistance value crow bar protection circuit and its becomes resistance value crow bar resistance value setting method |
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| CN103337871B (en) * | 2013-04-16 | 2015-01-07 | 许继集团有限公司 | Wind generating set low voltage ride through circuit and corresponding control method |
| JP5652975B1 (en) * | 2013-12-09 | 2015-01-14 | 山洋電気株式会社 | Motor control device |
| CN109120197B (en) * | 2017-06-23 | 2024-02-02 | 中国电力工程顾问集团华东电力设计院有限公司 | Double-fed motor variable-frequency speed control system based on current source converter |
| CN110247558B (en) * | 2018-03-09 | 2021-01-15 | 深圳市禾望电气股份有限公司 | Converter fault processing method, readable storage medium and converter |
| CN109546656A (en) * | 2018-11-07 | 2019-03-29 | 姜田贵 | A kind of energy consumption branch and control method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298121A (en) * | 2013-07-15 | 2015-01-21 | 哈尔滨工业大学（威海） | Doubly-fed wind power generation system simulation experiment platform for control technology research |
| CN104298121B (en) * | 2013-07-15 | 2017-08-29 | 哈尔滨工业大学（威海） | The dual feedback wind power generation system simulation experiment platform of Control-oriented technical research |
| CN104638878A (en) * | 2013-11-07 | 2015-05-20 | 艾默生网络能源有限公司 | Signal transmission method, signal transmission device, signal analysis method, signal analysis device, signal transmission circuit, and converter system |
| CN104638878B (en) * | 2013-11-07 | 2018-12-25 | 维谛技术有限公司 | Signal transmission, analysis method and device, signal circuit and converter system |
| CN108767903A (en) * | 2018-06-29 | 2018-11-06 | 国家电网有限公司 | Become resistance value crow bar protection circuit and its becomes resistance value crow bar resistance value setting method |
| CN108767903B (en) * | 2018-06-29 | 2020-12-15 | 国家电网有限公司 | Resistance value adjusting method for resistance value-variable crowbar protection circuit |
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| CN102386632A (en) | 2012-03-21 |
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Application publication date: 20130130 |