CN207947605U - Short-circuit protection and wind power plant - Google Patents
Short-circuit protection and wind power plant Download PDFInfo
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Abstract
The utility model discloses a kind of short-circuit protection and wind power plants, including：The input terminal of electronic current mutual inductor, the electronic current mutual inductor is connect with wind-driven generator；Comparison controller, receives the electrical signal of reaction and reference electrical signal of the electronic current mutual inductor output, and electrical signal of reaction and reference electrical signal are compared to generate switch control signal；Switching circuit is arranged in the transmission line of electricity of the wind-driven generator, and the control terminal of the switching circuit is connect with the output end of the comparison controller, the break-make for controlling the transmission line of electricity according to the switch control signal.Since the frequency range of electronic current mutual inductor electric current that can be detected is wider, detection frequency may range from zero hertz to tens kHz, can be realized and be protected with trigger switch circuit trip when frequency is less than 20Hz electric currents generation instantaneous short-circuit.Therefore, the protection of full frequency band transient short-circuit current is realized.
Description
Technical Field
The utility model relates to a wind power generation technical field, concretely relates to short-circuit protection device and wind power generation equipment.
Background
The rising of new energy, especially wind power generation, receives more and more attention from people, and formula wind power generation is by wind-force direct drive generator, and high efficiency, low noise, high life, reduction unit volume, reduction operation maintenance cost etc. a great deal of advantage such as low wind speed become mainstream wind power generation mode gradually. In the grid-connected power generation process of the wind generating set, once the output current of the wind generating set exceeds the design requirement of instantaneous short circuit, the wind generating set is burnt, and even the fire hazard of the whole machine is caused.
In order to perform instantaneous short-circuit current protection on the generator, a mutual inductor, a comparator and a switching circuit are generally connected in series between the generator and a converter, and the instantaneous short-circuit protection of the generator is realized by depending on the instantaneous short-circuit protection function of the switching circuit. However, applicants have found that when the generator output current exceeds the transient short circuit design, the switching circuit is not active and the transient short circuit current burns the generator.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that switching circuit can not carry out instantaneous short-circuit protection completely to the generator.
Therefore, according to the first aspect, the embodiment of the present invention provides a short-circuit protection device, which may include a switch circuit, connected to the converter, the switch circuit being disconnected when the transient short circuit occurs, so as to perform transient short-circuit protection on the wind power generator. The protection device can further comprise an electronic current transformer and a comparison controller, the electronic current transformer is connected with the wind driven generator, the current output by the wind driven generator is collected and detected, a voltage signal is output according to the received current of the wind driven generator, the voltage signal is related to the current size and can reflect the output state of the wind driven generator, the other end of the electronic current transformer is connected with the comparison controller, the output end of the electronic current transformer is connected with the induced electrical signal input end of the comparison controller, the reference electrical signal input end of the comparison controller is connected with a reference electrical signal, and the connected reference electrical signal is a preset voltage value. The electronic current transformer outputs a corresponding voltage signal according to the sampled instantaneous current value of the wind driven generator, the voltage signal is compared with a reference electric signal in a comparison controller, if the voltage value of the electronic current transformer is higher than a set protection value, the comparison controller sends a short-circuit switch control signal to a switch circuit, and the switch circuit is tripped to realize protection.
The frequency range of the current which can be detected by the electronic current transformer is wide and is not limited by direct current, the frequency range of the current can be zero hertz to dozens of kilohertz, the current with the output frequency of less than 20Hz of the wind driven generator can be detected, and when the current with the frequency of less than 20Hz is instantaneously short-circuited, the switch circuit can be triggered to be tripped to realize protection. The wind driven generator has the common working condition that the frequency of the output current is less than 20 Hz. Therefore, the protection device is particularly suitable for protecting the wind driven generator.
Optionally, the electronic current transformer has a wide operating frequency band, and can detect a current of zero to tens of kilohertz, and specifically, the electronic current transformer may be an electronic current transformer such as a hall current sensor, an optical current sensor, or the like. In particular to a sampling frequency of an electronic current transformer which is suitable for short-circuit current of an alternating wide frequency band and is 0 Hz-2.5 kHz. If the Hall sensor is adopted, the Hall transformation ratio of the Hall sensor can be 500A/V-800A/V, large current can be converted into small voltage to adapt to the reference electric signal, and the voltage input of the reference electric signal can be reduced.
Alternatively, the comparison controller may include a comparison judgment circuit and a comparison trigger circuit. The comparison and judgment circuit is connected with the electronic current transformer, compares the induced electrical signal comparison and judgment circuit with the reference electrical signal, outputs a comparison result, and if the voltage value of the induced electrical signal is higher than a set protection value, the comparison trigger circuit sends a switch control signal to the switch circuit to trigger the switch circuit to trip to realize instantaneous short-circuit protection.
Alternatively, the comparison and judgment circuit may include: the diode comprises a first diode, a first transistor, a second diode, a second transistor, a third diode, a third transistor, a fourth diode, a fourth transistor, a fifth transistor and a sixth transistor; the control electrode of the first transistor is connected with the output end of the electronic current transformer, the emitter electrode of the first transistor is connected with the control electrode of the third transistor, and the collector electrode of the first transistor is grounded; the control electrode of the second transistor is connected with a preset reference electric signal, the emitter electrode of the second transistor is connected with the control electrode of the fourth transistor, and the collector electrode of the second transistor is grounded; an emitter of the first transistor, an emitter of the second transistor, an emitter of the third transistor, and an emitter of the fourth transistor are connected to a first power supply; the collector electrode of the third transistor is connected with the collector electrode of the fifth transistor and is connected to the control electrode of the fifth transistor; a collector of the fourth transistor is connected with a collector of the sixth transistor; a control electrode of the fifth transistor is connected with a control electrode of the sixth transistor, and an emitter electrode of the fifth transistor and an emitter electrode of the sixth transistor are grounded; the anode of the first diode is connected with the control electrode of the first transistor, and the cathode of the first diode is connected with the emitter of the first transistor; the cathode of the third diode is connected with the cathode of the first diode, and the anode of the third diode is connected with the first power supply; the anode of the second diode is connected with the control electrode of the second transistor, and the cathode of the second diode is connected with the emitter of the second transistor; the cathode of the fourth diode is connected with the cathode of the second diode, and the anode of the fourth diode is connected with the first power supply.
Optionally, the comparison trigger circuit comprises: a seventh transistor, an eighth transistor, and a resistor; the control electrode of the seventh transistor is connected with the comparison result output end of the comparison judgment circuit; the drain electrode of the seventh transistor is connected with the control electrode of the eighth transistor and is connected to the second power supply, the drain electrode of the eighth transistor outputs a switch control signal, and the source electrode of the seventh transistor and the source electrode of the eighth transistor are connected to the ground; and a resistor disposed between the drain of the seventh transistor and the second power supply.
Optionally, the second power supply is at a voltage less than or equal to 60V. The voltage of the second power supply is the voltage value of the switch control signal, and the size of the second power supply can be determined according to the tripping voltage of the switch circuit. Typically, the trip voltage of the switching circuit is less than or equal to 60V.
Optionally, the switching circuit may be a frame breaker; the response frequency of the switch circuit is 0-2.5 kHz. The corresponding frequency of the comparison controller is 1MHz-5MHz, the rated voltage and rated current of the switch circuit can be larger, the application range is wide, short time delay is realized, the requirement of selective protection can be met, the short circuit segmentation capability is stronger, and different releases can be installed according to different requirements. Setting the corresponding frequency between 0Hz and 2.5kHz can better adapt to the instantaneous short-circuit current with different frequencies, especially the instantaneous short-circuit current with lower frequency below 20 Hz.
According to a second aspect, an embodiment of the present invention provides a wind power generation apparatus, including: a wind power generator; and a short circuit protection device as described above; the short-circuit protection device is arranged in a switch cabinet of a cabin of the wind power generation equipment.
Drawings
Fig. 1 shows a schematic structural diagram of a short-circuit protection device according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of a comparative controller according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Because the switch circuit is arranged between the wind driven generator and the converter, the situation that the switch circuit does not work when the output current of the generator exceeds the design requirement of instantaneous short circuit can also occur in the actual use process. After the switch circuit with better performance is replaced, the problem is not solved, and through analysis and test, the applicant finds that the rotating speed of the wind driven generator changes along with the change of the wind speed, so that the frequency of the output current of the wind driven generator has a variable frequency band, it is possible to vary from 0Hz to the maximum output frequency of the wind turbine, but various types of switching circuits are available, because only the current larger than or equal to 20Hz can be subjected to instantaneous short-circuit protection under the limitation of the current transformer used, the existing wind driven generator generally has a working state that the frequency of the output current is less than 20Hz, the existing technology can not carry out instantaneous short circuit protection on the wind driven generator with the working frequency less than 20Hz, therefore, the applicant provides a short-circuit protection device to solve the problem that the switching circuit cannot completely perform transient short-circuit protection on the generator.
The embodiment of the utility model provides a short-circuit protection device, because in the generator, especially aerogenerator ubiquitous output current's frequency is less than 20Hz operating condition, and the frequency of probably appearing is 8Hz electric current even. The detection frequency range of the electronic voltage transformer in the protection device can be zero hertz to dozens of kilohertz, the protection device can realize full-band instantaneous current protection, and especially can protect instantaneous short-circuit current with the frequency less than 20Hz, so the protection device is especially suitable for protecting the wind driven generator. As shown in fig. 1, the protection device may include: the switching circuit 30 is connected to the converter 50, and when an instantaneous short circuit occurs, the switching circuit 30 is turned off to perform instantaneous short circuit protection on the wind turbine 40. The protection device may further include an electronic current transformer 10 and a comparison controller 20, in this embodiment, the electronic current transformer 10 may be at least one of an air-core coil current transformer, an optical current sensor or an iron-core coil low-power current transformer, specifically, in this embodiment, a hall current sensor may be adopted, the electronic current transformer 10 is connected to the wind power generator 40, collects and detects the current output by the wind power generator 40, and outputs an induced electrical signal according to the received current of the wind power generator 40, the induced electrical signal may be a voltage signal, the voltage signal is related to the magnitude of the current and can reflect the output state of the wind power generator 40, the other end of the electronic current transformer 10 is connected to the comparison controller 20, specifically, the output end of the electronic current transformer 10 is connected to the induced electrical signal input end of the comparison controller 20, the reference electrical signal input terminal of the comparison controller 20 is connected to a reference electrical signal, which is a preset voltage value in this embodiment. The electronic current transformer 10 outputs a corresponding voltage signal according to the sampled instantaneous current value of the wind driven generator 40, and compares the voltage signal with a reference electrical signal in the comparison controller 20, if the voltage value of the electronic current transformer 10 is higher than a set protection value, the comparison controller 20 sends a short-circuit switch control signal to the switch circuit 30, the switch circuit 30 is tripped to realize protection, and the specific switch circuit can be a circuit breaker.
Because the frequency range of the current that the electronic current transformer 10 can detect is wide, and can detect direct current, and its frequency range of detecting can be zero hertz to tens kilohertz, not only can detect aerogenerator 40 output frequency and be less than 20Hz electric current, and can detect the electric current of higher frequency afterwards to can realize the current detection of aerogenerator 40 full frequency channel, when the frequency is less than 20Hz electric current and takes place the transient short circuit or takes place the transient short circuit at higher frequency electric current, can trigger switch circuit 30 and trip and realize the protection.
In an alternative embodiment, the electronic current transformer 10 has a wide operating frequency band, and can detect a current of zero to tens of khz, and specifically, the electronic current transformer 10 may be an electronic current transformer 10 such as a hall current sensor, an optical current sensor, or the like. In the present embodiment, an example of an electronic current sensor is given, and other current transformers with an operating frequency of zero to several tens of kilohertz are also applicable.
In order to realize full-band instantaneous short-circuit protection, the sampling frequency of the electronic current transformer 10 is 0Hz to 2.5 kHz. In the present embodiment, the sampling frequency of the electronic current transformer 10 is shown only by way of example, and other sampling frequency ranges from 0Hz are also applicable. The transformation ratio of the electronic current sensor may be 500A/V-800A/V, specifically, the transformation ratio may be 625A/V, when the instantaneous current of the wind turbine 40 is 0A, the voltage value of the induced electrical signal output by the electronic current transformer 10 is 0V, when the instantaneous current of the wind turbine 40 is 2500A, the voltage value of the induced electrical signal of the electronic current transformer 10 is 4V, and when the instantaneous current of the wind turbine 40 is-2500A, the voltage value of the induced electrical signal of the electronic current transformer 10 is-4V. The voltage value of the reference electrical signal may be set to 4V, and when the instantaneous current of the wind turbine 40 exceeds 2500A, the comparison controller 20 outputs a short-circuit switch control signal, and specifically, the short-circuit switch control signal may be at a high level, which triggers the switch circuit 30 to trip. The protection ratio of the protection device is 500A/V-800A/V. The transformation ratio of the electronic current sensor and the protection ratio of the protection device are only shown in the embodiment by way of example, and other transformation ratios are also applicable in the embodiment.
In an alternative embodiment, such as the comparison controller shown in fig. 2, the comparison controller may include a comparison determining circuit 21 and a comparison triggering circuit 22. The comparison and judgment circuit 21 is connected with the electronic current transformer 10, the induced electrical signal comparison and judgment circuit 21 is compared with the reference electrical signal, a comparison result is output, if the voltage value of the induced electrical signal is higher than the reference electrical signal, the comparison trigger circuit 22 sends a switch control signal to the switch circuit 30, and the switch circuit 30 is triggered to be tripped to realize instantaneous short-circuit protection. In order to adapt to the sampling frequency of the electronic current transformer 10, in this embodiment, the corresponding frequency of the comparison controller 20 may be 1MHz-5MHz, and specifically may be 3.3 MHz.
In an alternative embodiment, the comparison and judgment circuit 21 is composed of the following circuits, as shown in fig. 2, the comparison and judgment circuit 21 includes: the circuit may include: a first diode D1, a first transistor Q1, a second diode D2, a second transistor Q2, a third diode D3, a third transistor Q3, a fourth diode D4, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6; a control electrode of the first transistor Q1 is connected with an output end of the electronic current transformer, an emitter electrode of the first transistor Q1 is connected with a control electrode of the third transistor Q3, and a collector electrode of the first transistor Q1 is grounded; and connected to a first level; a control electrode of the second transistor Q2 is connected with a preset reference electric signal, an emitter electrode of the second transistor Q2 is connected with a control electrode of the fourth transistor Q4, and a collector electrode of the second transistor Q2 is grounded; an emitter of the first transistor Q1, an emitter of the second transistor Q2, an emitter of the third transistor Q3, and an emitter of the fourth transistor Q4 are connected to a first power source VCC 1; the collector of the third transistor Q3 is connected to the collector of the fifth transistor Q5 and to the gate of the fifth transistor Q5; the collector of the fourth transistor Q4 is connected to the collector of the sixth transistor Q6; a control electrode of the fifth transistor Q5 is connected with a control electrode of the sixth transistor Q6, and an emitter electrode of the fifth transistor Q5 and an emitter electrode of the sixth transistor Q6 are grounded; the anode of the first diode D1 is connected with the control electrode of the first transistor Q1, and the cathode of the first diode D1 is connected with the emitter of the first transistor Q1; the cathode of the third diode D3 is connected to the cathode of the first diode D1, and the anode of the third diode D3 is connected to the first power VCC 1; the anode of the second diode D2 is connected with the control electrode of the second transistor Q2, and the cathode of the second diode D2 is connected with the emitter of the second transistor Q2; a cathode of the fourth diode D4 is connected to a cathode of the second diode D2, and an anode of the fourth diode D4 is connected to the first power VCC 1.
In the present embodiment, a first resistor R1, a second resistor R2, and a third resistor R3 may be further included, the first resistor R1 is disposed between the emitter of the first transistor Q1 and the first power supply VCC1, the second resistor R2 is disposed between the emitter of the second transistor Q2 and the first power supply VCC1, and the third resistor R3 is disposed between the emitter of the third transistor Q3 and the emitter of the fourth transistor Q4 and the first power supply VCC 1. In this embodiment, the transistor may be an NPN transistor, a PNP transistor, or an MOS transistor.
In an alternative embodiment, as shown in fig. 2, the comparison trigger circuit includes: a seventh transistor Q7, an eighth transistor Q8, and a fourth resistor R4; the control electrode of the seventh transistor Q7 is connected with the comparison result output end OUT of the comparison judgment circuit; the drain of the seventh transistor Q7 is connected to the control electrode of the eighth transistor Q8 and to the second power source VCC2, the drain of the eighth transistor Q8 outputs the switching control signal, and the source of the seventh transistor Q7 and the source of the eighth transistor Q8 are connected to ground; and a fourth resistor R4 disposed between the drain of the seventh transistor Q7 and the second power source VCC 2.
In this embodiment, the transistor may be an NPN transistor, a PNP transistor, or an MOS transistor.
To ensure that the protection architecture can use different switching circuits 30 due to different trip voltages of different types of switching circuits, in an alternative embodiment, the second power supply VCC2 is at a voltage less than or equal to 60V. As can be seen from fig. 2, the voltage of the second power VCC2 is the voltage value of the switch control signal outputted by the comparison trigger circuit 22, and the magnitude of the second power VCC2 can be determined according to the trip voltage of the switch circuit 30. Typically, the trip voltage of the switching circuit 30 is less than or equal to 60V.
In an alternative embodiment, the switching circuit 30 is a frame breaker; the response frequency of the frame-type circuit breaker is 0 Hz-2.5 kHz. The frame type circuit breaker has the advantages that the rated voltage and the rated current can be larger, the application range is wide, short time delay is realized, the requirement of selective protection can be met, the short circuit segmentation capability is stronger, and different releases can be installed according to different requirements. The corresponding frequency is set to be 0 Hz-2.5 kHz, so that the method can be well suitable for instantaneous short-circuit current with different frequencies, particularly instantaneous short-circuit current with lower frequency below 20Hz, and the protection of the instantaneous short-circuit current in a full screen section is realized.
The embodiment of the utility model provides a wind power generation equipment can include aerogenerator, the short-circuit protection device of the description of the above-mentioned embodiment, in the cubical switchboard in this short-circuit protection device wind power generation equipment's cabin. The space occupied by the protection device can be reduced while a corresponding speed can be provided. And is convenient for maintenance.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A short circuit protection device, comprising:
the input end of the electronic current transformer is connected with the wind driven generator;
the comparison controller receives the induced electrical signal output by the electronic current transformer and compares the magnitude of the induced electrical signal with a preset reference electrical signal value to generate a switch control signal;
and the control end of the switch circuit is connected with the output end of the comparison controller and is used for switching on or off according to the switch control signal so as to control the on-off of the power transmission line.
2. The short-circuit protection device of claim 1, wherein the electronic current transformer comprises at least one of an air-core coil current transformer, an optical current sensor, or a core-coil low-power current transformer.
3. The short-circuit protection device of claim 2, wherein the sampling frequency of the electronic current transformer is between 0Hz and 2.5 kHz.
4. The short-circuit protection device of claim 2, wherein the electronic current transformer has a transformation ratio of 500A/V to 800A/V.
5. The short-circuit protection device of claim 1, wherein the comparison controller comprises:
the comparison judgment circuit is connected with the output end of the electronic current transformer and used for comparing the magnitude of the induction electric signal with the reference electric signal value to obtain a comparison result;
and the comparison trigger circuit is connected with the comparison judgment circuit and is used for generating a switch control signal according to the comparison result.
6. The short-circuit protection device of claim 5, wherein the comparison and determination circuit comprises: the diode comprises a first diode, a first transistor, a second diode, a second transistor, a third diode, a third transistor, a fourth diode, a fourth transistor, a fifth transistor and a sixth transistor; wherein,
a control electrode of the first transistor is connected with an output end of an electronic current transformer, an emitter electrode of the first transistor is connected with a control electrode of the third transistor, and a collector electrode of the first transistor is grounded;
a control electrode of the second transistor is connected with a preset reference electric signal, an emitter electrode of the second transistor is connected with a control electrode of the fourth transistor, and a collector electrode of the second transistor is grounded;
an emitter of the first transistor, an emitter of the second transistor, an emitter of the third transistor, and an emitter of the fourth transistor are connected to a first power supply;
a collector of the third transistor is connected to a collector of the fifth transistor and to a control electrode of the fifth transistor;
a collector of the fourth transistor is connected to a collector of the sixth transistor;
a control electrode of the fifth transistor is connected with a control electrode of the sixth transistor;
an emitter of the fifth transistor and an emitter of the sixth transistor are grounded;
the anode of the first diode is connected with the control electrode of the first transistor, and the cathode of the first diode is connected with the emitter of the first transistor;
the cathode of the third diode is connected with the cathode of the first diode, and the anode of the third diode is connected with the first power supply;
the anode of the second diode is connected with the control electrode of the second transistor, and the cathode of the second diode is connected with the emitter of the second transistor;
and the cathode of the fourth diode is connected with the cathode of the second diode, and the anode of the fourth diode is connected with the first power supply.
7. The short-circuit protection device of claim 5, wherein the comparison trigger circuit comprises: a seventh transistor, an eighth transistor, and a resistor;
the control electrode of the seventh transistor is connected with the comparison result output end of the comparison judgment circuit;
the drain electrode of the seventh transistor is connected with the control electrode of the eighth transistor and is connected to a second power supply, the drain electrode of the eighth transistor outputs the switch control signal, and the source electrode of the seventh transistor and the source electrode of the eighth transistor are grounded;
the resistor is arranged between the drain electrode of the seventh transistor and the second power supply.
8. The short-circuit protection device of claim 7,
the voltage of the second power supply is less than or equal to 60V.
9. The short-circuit protection device according to any one of claims 1 to 8, wherein the response frequency of the switching circuit is between 0Hz and 2.5 kHz.
10. A wind power plant, characterized by comprising:
a wind power generator;
and a short-circuit protection device according to any one of claims 1-9;
the short-circuit protection device is arranged in a switch cabinet of a cabin of the wind power generation equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721798196.9U CN207947605U (en) | 2017-12-20 | 2017-12-20 | Short-circuit protection and wind power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721798196.9U CN207947605U (en) | 2017-12-20 | 2017-12-20 | Short-circuit protection and wind power plant |
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| Publication Number | Publication Date |
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| CN207947605U true CN207947605U (en) | 2018-10-09 |
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| CN201721798196.9U Active CN207947605U (en) | 2017-12-20 | 2017-12-20 | Short-circuit protection and wind power plant |
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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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2017
- 2017-12-20 CN CN201721798196.9U patent/CN207947605U/en active Active
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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