CN112701665A - Electrical protection device and method for onshore double-fed wind turbine generator and box-type transformer - Google Patents
Electrical protection device and method for onshore double-fed wind turbine generator and box-type transformer Download PDFInfo
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- CN112701665A CN112701665A CN202011641271.7A CN202011641271A CN112701665A CN 112701665 A CN112701665 A CN 112701665A CN 202011641271 A CN202011641271 A CN 202011641271A CN 112701665 A CN112701665 A CN 112701665A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
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Abstract
The invention discloses a land double-fed wind turbine generator, a box-type transformer electrical protection device and a method. The invention obviously improves the sensitivity, reliability, selectivity and quick-action property of protecting equipment such as wind driven generators, variable frequency cabinets, box-type transformers and connecting cables thereof, is not influenced by the low voltage ride through working condition of a wind turbine generator set, and effectively reduces the electrical damage probability of the equipment.
Description
Technical Field
The invention relates to the technical field of wind turbine generators, in particular to an electrical protection device and method for a land double-fed wind turbine generator and a box-type transformer.
Background
In recent years, the wind power industry in China develops rapidly. By 6 months in 2020, wind power in China is accumulated and installed by 2.17 hundred million kilowatts and stably stays at the first place in the world. Meanwhile, as the wind turbine generator is developed towards large capacity of long blades and single wind turbine generators, the cost of a single wind turbine generator is higher and higher, and the fault shutdown loss is larger and larger. According to the statistical data of the faults, the wind driven generator, the frequency converter, the box type transformer (hereinafter referred to as box transformer) and other electrical faults account for more than half of the total quantity of the faults of the wind power plant, and dozens of accidents of fan burnout and personnel burn in recent years in the wind power industry are all caused by the electrical faults. Therefore, the electric fault occupation ratio of the fan is high, and the consequence is serious.
At present, the electrical fault of the wind turbine generator is mainly cut off by a tower bottom circuit breaker and a box transformer low-voltage side circuit breaker, but the protection devices of the two circuit breakers have poor maintainability and low reliability, and the failure frequently occurs during the fault to cause the expansion of the accident. Meanwhile, the wind turbine generator is positioned at the tail end of a power grid, the fault current is relatively small, and the influence of the low-voltage ride through current causes that the existing protection constant values at all levels are large and the sensitivity is low.
Therefore, it is obvious that the above-mentioned conventional wind turbine generator set, box-type transformer protection device and method still have inconveniences and defects, and further improvement is urgently needed. How to create a new protection device and method for a land double-fed wind turbine generator and a box-type transformer, and belongs to one of the current important research and development subjects.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an electrical protection device for a land double-fed wind turbine generator set and a box-type transformer, which can realize more reliable and sensitive protection for a wind turbine generator, a frequency conversion cabinet, a box-type transformer and related cables, so as to avoid major electrical accidents of the wind turbine generator set and the box-type transformer, and overcome the defects of the existing electrical protection device for the wind turbine generator set and the box-type transformer.
In order to solve the technical problems, the invention provides an electrical protection device for a land double-fed wind turbine generator and a box-type transformer, which comprises a first current transformer, a second current transformer, an incomplete differential protection device and a first circuit breaker, wherein the first current transformer is arranged on a low-voltage side line of the box-type transformer, the second current transformer is arranged on a stator current output line of a wind turbine generator, the incomplete differential protection device is respectively and electrically connected with the first current transformer and the second current transformer, the low-voltage side current I1 of the box-type transformer and the stator current I2 of the wind turbine generator are taken as input signals, and the first circuit breaker is arranged on the low-voltage side line of the box-type transformer, is electrically connected with the incomplete differential protection device and receives an action signal to realize circuit breaking.
As an improvement of the invention, the incomplete differential protection device is electrically connected with a second circuit breaker, and the second circuit breaker is arranged at the bottom of the fan tower.
Further, the stator winding of the wind turbine generator is in star connection, and the second current transformer is installed on the neutral point side.
Furthermore, the stator winding of the wind turbine generator is in angle connection, and the second current transformer is installed on the side close to the outlet side of the generator.
Further, the incomplete differential device is provided with a proportional differential protection operating condition and a quick-break differential operating condition, wherein:
the method comprises the following steps that braking current Ir is | I1+ I2|, differential current Id is | I1-I2|, rated current of a wind turbine generator is Ie, preset slope is k, a preset proportional differential starting value is Iqd, and a preset quick-break differential fixed value is Isd;
the preset proportion differential starting value Iqd is set according to the rotor side current I3 when the wind turbine generator is reliably kept out of full load operation, the reliability coefficient is not less than 1.2, and is set according to the maximum differential unbalanced current when the wind turbine generator is reliably kept out of starting, operating and stopping processes;
setting the quick-break differential constant value Isd according to the maximum unbalanced current which reliably avoids external faults;
the proportional differential protection action conditions are as follows:
when Ir is less than or equal to Ie, the proportion differential protection is started when Id is greater than Iqd,
when Ir > Ie, Id > Iqd + kX (Ir-Ie) starts the proportional differential protection;
the quick-break differential protection action conditions are as follows:
and when the Id is larger than the Isd, the quick-break differential protection is started.
Further, the incomplete differential device is provided with a harmonic brake latch and a CT disconnection latch.
In addition, the invention also provides an electrical protection method for the onshore double-fed wind turbine generator and the box-type transformer, which realizes more reliable and sensitive protection for the wind turbine generator, the frequency conversion cabinet, the box-type transformer and related cables, so as to avoid major electrical accidents of the wind turbine generator and the box-type transformer, and overcome the defects of the existing protection method for the wind turbine generator and the box-type transformer.
In order to solve the technical problem, the invention provides an electrical protection method for a land double-fed wind turbine generator and a box-type transformer, which is characterized in that the land double-fed wind turbine generator and box-type transformer electrical protection device comprises proportional differential protection and quick-break differential protection, wherein:
the method comprises the following steps that braking current Ir is | I1+ I2|, differential current Id is | I1-I2|, rated current of a wind turbine generator is Ie, preset slope is k, a preset proportional differential starting value is Iqd, and a preset quick-break differential fixed value is Isd;
the setting method of the preset proportional differential starting value Iqd comprises the following steps:
according to the method, the rotor side current I3 setting during full-load operation of the wind turbine generator is reliably avoided, the reliability coefficient is not less than 1.2,
setting the maximum differential unbalanced current in the starting, running and stopping processes of the wind turbine generator is reliably avoided;
the setting method of the quick-break differential constant value Isd comprises the following steps:
setting according to the maximum unbalanced current which reliably avoids external faults;
the proportional differential protection action conditions are as follows:
when Ir is less than or equal to Ie, the proportion differential protection is started when Id is greater than Iqd,
when Ir > Ie, Id > Iqd + kX (Ir-Ie) starts the proportional differential protection;
the quick-break differential protection action conditions are as follows:
and when the Id is larger than the Isd, the quick-break differential protection is started.
As a further improvement, the method for electrically protecting the land double-fed wind turbine generator and the box-type transformer is provided with a harmonic braking latch and a CT disconnection latch.
After adopting such design, the invention has at least the following advantages:
the invention obviously improves the sensitivity, reliability, selectivity and quick-action property of protecting equipment such as wind driven generators, variable frequency cabinets, box-type transformers and connecting cables thereof, is not influenced by the low voltage ride through working condition of a wind turbine generator set, and effectively reduces the electrical damage probability of the equipment.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic diagram of the electrical protection device for the onshore double-fed wind turbine generator and the box-type transformer provided by the invention.
Fig. 2 is a schematic graph of the triggering of a protection operation condition of the incomplete differential protection device.
Fig. 3 is a protection logic diagram of the incomplete differential protection device.
Detailed Description
Referring to fig. 1, the present invention provides an electrical protection device for a land double-fed wind turbine generator and a box-type transformer, including a first current transformer CT1, a second current transformer CT2, an incomplete differential protection device and a first breaker Q1, where the first current transformer CT1 is installed on a low-voltage side line of the box-type transformer, the second current transformer CT2 is installed on a stator current output line of a wind turbine generator, the incomplete differential protection device is electrically connected to the first current transformer CT1 and the second current transformer CT2, a low-voltage side current I1 of the box-type transformer and a stator current I2 of the wind turbine generator are taken as input signals, and the first breaker Q1 is installed on the low-voltage side line of the box-type transformer and electrically connected to the incomplete differential protection device. In other embodiments of the invention, a second circuit breaker is further provided, and the second circuit breaker is installed at the bottom of the fan tower and is also electrically connected with the incomplete differential protection device.
Preferably, the second current transformer CT2 is installed on the neutral point side for a star connection of the stator winding of the wind turbine. For the wind turbine with angular connection of the stator winding, the second current transformer CT2 is mounted close to the generator outlet side.
Referring to fig. 2, the incomplete differential device is configured with a proportional differential protection operation condition and a quick-break differential operation condition, in the drawing, a braking current Ir is | I1+ I2|, a differential current Id is | I1-I2|, a rated current of the wind turbine generator is Ie, a preset slope is k, a preset proportional differential start value is Iqd, and a preset quick-break differential fixed value is Isd;
the proportional differential protection action conditions are as follows:
when Ir is less than or equal to Ie, the proportional differential protection is started when Id is greater than Iqd;
when Ir > Ie, Id > Iqd + kX (Ir-Ie) activates the proportional differential protection.
The quick-break differential protection action conditions are as follows:
and when the Id is larger than the Isd, the quick-break differential protection is started.
The setting method of the preset proportional differential starting value Iqd comprises the following steps:
(1) setting rotor side current I3 when the wind turbine generator runs at full load is avoided reliably, and the reliability coefficient is not less than 1.2;
(2) the maximum differential unbalanced current setting in the starting, running and stopping processes of the wind turbine generator is reliably avoided.
The setting method of the quick-break differential constant value Isd comprises the following steps:
and reliably avoiding the maximum unbalanced current setting of the external fault.
Referring to fig. 3, the protection logic of the incomplete differential device includes a harmonic brake latch and a CT disconnection latch in addition to the proportional differential protection and the quick-break differential protection.
The harmonic braking locking is to fully consider the harmonic conditions of the wind turbine under the working conditions of starting, running, stopping, external fault large current (such as low voltage ride through) and the like, and make a distinguishing judgment on the harmonic conditions and the harmonic waves during internal fault so as to prevent misoperation during normal working conditions and external fault and operation failure during internal fault.
CT disconnect latches are only enabled at small currents or differential currents (e.g., 1.1 × Ie) and disabled at larger currents or differential currents (e.g., 1.2 × Ie).
In addition, the invention also provides a method for protecting the onshore double-fed wind turbine generator set and the box-type transformer, and the method for setting the protection logic, the proportional differential protection action condition, the quick-break protection action condition, the proportional differential starting value Iqd and the quick-break differential constant value Isd is adopted for the functional setting of the incomplete differential device for detailed description, and is not repeated again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (8)
1. The electrical protection device is characterized by comprising a first current transformer, a second current transformer, an incomplete differential protection device and a first circuit breaker, wherein the first current transformer is installed on a low-voltage side line of the box-type transformer, the second current transformer is installed on a stator current output line of the wind generating set, the incomplete differential protection device is electrically connected with the first current transformer and the second current transformer respectively, a low-voltage side current I1 of the box-type transformer and a stator current I2 of the wind generating set are taken as input signals, the first circuit breaker is installed on the low-voltage side line of the box-type transformer and is electrically connected with the incomplete differential protection device, and an action signal is received to realize circuit breaking protection.
2. The electrical protection device for the onshore double-fed wind turbine generator and box transformer as claimed in claim 1, wherein the incomplete differential protection device is electrically connected with a second circuit breaker, and the second circuit breaker is installed at the bottom of the wind turbine tower.
3. The protection device for the onshore double-fed wind turbine generator and box-type transformer as claimed in claim 1, wherein the stator winding of the wind turbine generator is star-connected, and the second current transformer is installed on the neutral point side.
4. The electrical protection device for a land double-fed wind turbine generator and box transformer as claimed in claim 1, wherein the stator winding of the wind turbine generator is angle-connected and the second current transformer is installed near the outlet side of the generator.
5. The electrical protection device for the onshore double-fed wind turbine generator and box-type transformer as claimed in claim 1, wherein the incomplete differential device is provided with a proportional differential protection action condition and a quick-break differential action condition, wherein:
the method comprises the following steps that braking current Ir is | I1+ I2|, differential current Id is | I1-I2|, rated current of a wind turbine generator is Ie, preset slope is k, a preset proportional differential starting value is Iqd, and a preset quick-break differential fixed value is Isd;
the preset proportion differential starting value Iqd is set according to the rotor side current I3 when the wind turbine generator is reliably kept out of full load operation, the reliability coefficient is not less than 1.2, and is set according to the maximum differential unbalanced current when the wind turbine generator is reliably kept out of starting, operating and stopping processes;
setting the quick-break differential constant value Isd according to the maximum unbalanced current which reliably avoids external faults;
the proportional differential protection action conditions are as follows:
when Ir is less than or equal to Ie, the proportion differential protection is started when Id is greater than Iqd,
when Ir > Ie, Id > Iqd + kX (Ir-Ie) starts the proportional differential protection;
the quick-break differential protection action conditions are as follows:
and when the Id is larger than the Isd, the quick-break differential protection is started.
6. The electrical protection device for the onshore double-fed wind turbine generator and box transformer according to claim 5, wherein the incomplete differential device is provided with a harmonic brake latch and a CT disconnection latch.
7. An electrical protection method for a land double-fed wind turbine generator and a box-type transformer is characterized in that the land double-fed wind turbine generator and box-type transformer electrical protection device of any one of claims 1 to 6 is adopted, and comprises proportional differential protection and quick-break differential protection, wherein:
the method comprises the following steps that braking current Ir is | I1+ I2|, differential current Id is | I1-I2|, rated current of a wind turbine generator is Ie, preset slope is k, a preset proportional differential starting value is Iqd, and a preset quick-break differential fixed value is Isd;
the setting method of the preset proportional differential starting value Iqd comprises the following steps:
according to the method, the rotor side current I3 setting during full-load operation of the wind turbine generator is reliably avoided, the reliability coefficient is not less than 1.2,
setting the maximum differential unbalanced current in the starting, running and stopping processes of the wind turbine generator is reliably avoided;
the setting method of the quick-break differential constant value Isd comprises the following steps:
setting according to the maximum unbalanced current which reliably avoids external faults;
the proportional differential protection action conditions are as follows:
when Ir is less than or equal to Ie, the proportion differential protection is started when Id is greater than Iqd,
when Ir > Ie, Id > Iqd + kX (Ir-Ie) starts the proportional differential protection;
the quick-break differential protection action conditions are as follows:
and when the Id is larger than the Isd, the quick-break differential protection is started.
8. The method for electrically protecting a land double-fed wind turbine generator and a box-type transformer as claimed in claim 7, wherein a harmonic brake latch and a CT disconnection latch are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641271.7A CN112701665A (en) | 2020-12-31 | 2020-12-31 | Electrical protection device and method for onshore double-fed wind turbine generator and box-type transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011641271.7A CN112701665A (en) | 2020-12-31 | 2020-12-31 | Electrical protection device and method for onshore double-fed wind turbine generator and box-type transformer |
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| CN112701665A true CN112701665A (en) | 2021-04-23 |
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| CN202011641271.7A Pending CN112701665A (en) | 2020-12-31 | 2020-12-31 | Electrical protection device and method for onshore double-fed wind turbine generator and box-type transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595032A (en) * | 2021-07-27 | 2021-11-02 | 西安热工研究院有限公司 | System and method for protecting double-fed wind driven generator and outgoing cable by electric quantity |
| CN114520493A (en) * | 2022-03-10 | 2022-05-20 | 南京智汇电力技术有限公司 | Self-adaptive incomplete differential protection method for series supply line of distribution network |
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2020
- 2020-12-31 CN CN202011641271.7A patent/CN112701665A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595032A (en) * | 2021-07-27 | 2021-11-02 | 西安热工研究院有限公司 | System and method for protecting double-fed wind driven generator and outgoing cable by electric quantity |
| CN114520493A (en) * | 2022-03-10 | 2022-05-20 | 南京智汇电力技术有限公司 | Self-adaptive incomplete differential protection method for series supply line of distribution network |
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