CN112701666A - Electrical protection device and method for offshore double-fed wind turbine generator and matched booster equipment - Google Patents
Electrical protection device and method for offshore double-fed wind turbine generator and matched booster equipment Download PDFInfo
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- CN112701666A CN112701666A CN202011641437.5A CN202011641437A CN112701666A CN 112701666 A CN112701666 A CN 112701666A CN 202011641437 A CN202011641437 A CN 202011641437A CN 112701666 A CN112701666 A CN 112701666A
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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
Abstract
The invention discloses an offshore double-fed wind turbine generator and a matched booster equipment electric protection device and method, which comprise 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 high-voltage side circuit of a booster transformer, the second current transformer is arranged on a stator current output circuit 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, a high-voltage side current I1 of the booster transformer and a stator current I2 of the wind turbine generator are taken as input signals, and the first circuit breaker is arranged on a ring main unit circuit and is electrically connected with the incomplete differential protection device, so that the open circuit protection is realized. The invention obviously improves the sensitivity, reliability, selectivity and quick-acting property of protecting equipment such as an offshore wind driven generator, a frequency conversion cabinet, a step-up transformer 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 an offshore double-fed wind turbine generator and a matched booster device.
Background
In recent years, the offshore wind power industry in China develops rapidly. By 6 months end in 2020, the wind power accumulation installation in the offshore region of China is 699 ten thousand kilowatts, wherein the new installation costs 106 thousand kilowatts. With the development of wind turbine generators towards large capacity with long blades and single wind turbine generators, the cost of a single wind turbine generator is higher and higher, and the influence of shutdown failure loss is larger and larger. And the offshore environment is severe, once the wind power equipment breaks down, the equipment maintenance work is severely restricted, and serious potential safety hazard and economic loss are brought.
At present, the electrical fault of an offshore wind turbine generator is mainly cut off by a tower bottom circuit breaker and a ring main unit circuit breaker which are provided with overcurrent protection, and the wind turbine generator is positioned at the tail end of a power grid, so that the fault current is relatively small and is influenced by the current of low voltage ride through, and the conventional protection constant value is large and the sensitivity is low.
Therefore, it is obvious that the above-mentioned existing offshore wind turbine generator and the protection device and method for the associated voltage boosting equipment still have inconvenience and defects, and further improvement is urgently needed. How to create a new offshore double-fed wind turbine generator and a device and a method for protecting a matched booster device, 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 an offshore double-fed wind turbine generator and a matched booster device, so that the offshore double-fed wind turbine generator, a frequency conversion cabinet, a booster transformer and related cables are more reliably and sensitively protected, a major electrical accident of the wind turbine generator and the matched booster device thereof is avoided, and the defects of the existing electrical protection device for the wind turbine generator and the box type transformer are overcome.
In order to solve the technical problems, the invention provides an electrical protection device for an offshore double-fed wind turbine generator and a matched booster device, 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 high-voltage side circuit of a booster transformer, the second current transformer is arranged on a stator current output circuit 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 high-voltage side current I1 of the booster transformer and the stator current I2 of the wind turbine generator are taken as input signals, the first circuit breaker is arranged on a ring main unit circuit and is electrically connected with the incomplete differential protection device, and the first circuit breaker receives an action signal to realize circuit breaking protection.
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 sum of absolute values of rotor side current I3 and maximum distribution load current I4 when the wind turbine generator runs at full load reliably and is set according to the maximum differential unbalanced current when the wind turbine generator runs, and the wind turbine generator is reliably avoided in the processes of starting, running and stopping;
setting the quick-break differential constant value Isd according to the maximum magnetizing inrush current which can be reliably generated by a step-up transformer and according to the maximum unbalanced current which can be reliably generated by an external fault;
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 offshore double-fed wind turbine generator and a matched booster equipment electrical protection method, so that the offshore double-fed wind turbine generator, the frequency conversion cabinet, the booster transformer and related cables can be more reliably and sensitively protected, and a major wind turbine generator and a matched booster equipment electrical accident thereof can be avoided, thereby overcoming the defects of the existing offshore wind turbine generator and the matched booster equipment protection method.
In order to solve the technical problems, the invention provides an electrical protection method for an offshore double-fed wind turbine generator and a matched booster device, and the electrical protection device for the offshore double-fed wind turbine generator and the matched booster 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 sum of the absolute values of the rotor side current I3 and the maximum distribution load current I4 when the wind turbine generator runs at full load is reliably avoided,
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:
according to reliably avoiding the maximum excitation inrush current setting which is possibly generated by the step-up transformer,
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 electrical protection method of the offshore double-fed wind turbine generator and the matched booster equipment 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-acting property of protecting equipment such as an offshore wind driven generator, a frequency conversion cabinet, a step-up transformer 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 offshore double-fed wind turbine generator and the matched booster equipment 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 an offshore double-fed wind turbine generator and a matched boost device, 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 high-voltage side line of the boost transformer, the second current transformer CT2 is installed on a stator current output line of the wind turbine generator, the incomplete differential protection device is electrically connected to the first current transformer and the second current transformer, the boost transformer high-voltage side current I1 and the wind turbine generator stator current I2 are taken as input signals, and the first breaker Q1 is installed on a ring main unit line and electrically connected to the incomplete differential protection device, and receives an operation signal to implement open circuit protection. In addition, a second circuit breaker Q2 is further arranged, the second circuit breaker Q2 is installed at the bottom of the fan tower, and the second circuit breaker Q2 is also electrically connected with the incomplete differential protection device to realize circuit breaking protection.
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 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.
The setting method of the preset proportional differential starting value Iqd comprises the following steps:
(1) the sum of the absolute values of rotor side current I3 and maximum distribution load current I4 when the wind turbine generator runs at full load is reliably avoided, namely the sum is set;
(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:
(1) setting according to the maximum magnetizing inrush current which can be reliably avoided from being generated by the step-up transformer
(2) 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 marine double-fed wind turbine generator and a matched booster equipment protection method, and by adopting the marine double-fed wind turbine generator and the matched booster equipment protection device, the protection logic, the proportional differential protection action condition, the quick-break protection action condition, the setting method of the proportional differential starting value Iqd and the setting method of the quick-break differential constant value Isd are detailed in the function setting of the incomplete differential device, and are not repeated again.
The invention is also suitable for the wiring condition of land double-fed wind turbine generator, booster transformer and ring main unit configuration.
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 utility model provides an offshore double-fed formula wind turbine generator system and supporting booster equipment electrical protection device, its characterized in that includes first current transformer, second current transformer, incomplete differential protection device and first circuit breaker, first current transformer installs on booster transformer high-voltage side line, second current transformer installs on wind generating set stator current output line, incomplete differential protection device is connected with first current transformer and second current transformer electricity respectively, gets booster transformer high-voltage side current I1 and wind generating set stator current I2 and is the input signal, first circuit breaker is installed on looped netowrk cabinet circuit and is connected with incomplete differential protection device electricity, receives the action signal and realizes the protection of opening a circuit.
2. The electrical protection device for the offshore double-fed wind turbine generator and the matched booster equipment according to 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 electrical protection device for the offshore double-fed wind turbine generator and the matched booster equipment according to 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 the offshore double-fed wind turbine generator and the matched booster equipment according to claim 1, wherein a stator winding of the wind turbine generator is in angle connection, and the second current transformer is installed close to the outlet side of the generator.
5. The electrical protection device for the offshore double-fed wind turbine generator and the matched booster equipment according to 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 sum of absolute values of rotor side current I3 and maximum distribution load current I4 when the wind turbine generator runs at full load reliably and is set according to the maximum differential unbalanced current when the wind turbine generator runs, and the wind turbine generator is reliably avoided in the processes of starting, running and stopping;
setting the quick-break differential constant value Isd according to the maximum magnetizing inrush current which can be reliably generated by a step-up transformer and according to the maximum unbalanced current which can be reliably generated by an external fault;
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 offshore double-fed wind turbine generator and associated booster equipment electrical protection device of 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 an offshore double-fed wind turbine generator and a matched booster device is characterized in that the electrical protection device for the offshore double-fed wind turbine generator and the matched booster device according to any one of claims 1 to 6 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 sum of the absolute values of the rotor side current I3 and the maximum distribution load current I4 when the wind turbine generator runs at full load is reliably avoided,
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:
according to reliably avoiding the maximum excitation inrush current setting which is possibly generated by the step-up transformer,
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 offshore double-fed wind turbine generator and the electric protection method for the matched booster equipment according to claim 7, wherein a harmonic brake latch and a CT disconnection latch are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641437.5A CN112701666A (en) | 2020-12-31 | 2020-12-31 | Electrical protection device and method for offshore double-fed wind turbine generator and matched booster equipment |
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| CN202011641437.5A CN112701666A (en) | 2020-12-31 | 2020-12-31 | Electrical protection device and method for offshore double-fed wind turbine generator and matched booster equipment |
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| CN112701666A true CN112701666A (en) | 2021-04-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488964A (en) * | 2021-07-27 | 2021-10-08 | 西安热工研究院有限公司 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
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- 2020-12-31 CN CN202011641437.5A patent/CN112701666A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488964A (en) * | 2021-07-27 | 2021-10-08 | 西安热工研究院有限公司 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
| CN113488964B (en) * | 2021-07-27 | 2023-02-21 | 西安热工研究院有限公司 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
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