CN109066632B - Rapid de-excitation method - Google Patents
Rapid de-excitation method Download PDFInfo
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- CN109066632B CN109066632B CN201811215999.6A CN201811215999A CN109066632B CN 109066632 B CN109066632 B CN 109066632B CN 201811215999 A CN201811215999 A CN 201811215999A CN 109066632 B CN109066632 B CN 109066632B
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- excitation
- switch
- rapid
- piezoresistor
- demagnetizing
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims description 31
- 230000008033 biological extinction Effects 0.000 claims description 16
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 230000005347 demagnetization Effects 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a rapid de-excitation method, which comprises the following steps: the first piezoresistor, the plurality of switch tube modules and the controller; the switching tube module includes: the first end and the second end of the switching tube are respectively connected with the two poles of the diode, the second piezoresistor is connected with the diode in parallel, and the third end of the switching tube is connected with the controller; the switch modules are connected in series in sequence to form a switch module, and after being connected in series with the current limiter winding, the switch module is connected in parallel with the first piezoresistor, and two ends of the first piezoresistor are connected with the output end of the rectifier bridge at the power supply side. In the invention, when the quick de-excitation is needed, the controller can simultaneously turn off all the switching tubes, and the current limiter winding can induce voltage which enables the first piezoresistor and the second piezoresistor to be conducted, so that the energy on the winding can be quickly released on the resistor to quickly de-excite.
Description
Technical Field
The invention relates to the technical field of power grid de-excitation, in particular to a rapid de-excitation method.
Background
As the capacity of the power grid is increased, the short-circuit current value of the power transmission and distribution system is continuously increased, and in order to reduce the short-circuit current below the maximum open-circuit current of the switching equipment, some methods are needed to perform current limiting. The superconducting fault current limiter is a novel fault current limiting device, and presents low impedance when the system is in normal operation, when the system is in short circuit, high impedance can be instantaneously generated by de-excitation of an exciting coil of the superconducting fault current limiter to limit the short circuit current of the system, and because the short circuit current of the system is extremely fast, in order to reduce the short circuit current below the maximum on-off current of the switching device, the exciting current is generally required to be reduced by more than 90% in 100 ms.
The prior art de-excitation mode of the current limiter is shown in fig. 1, the secondary contact K2 of the de-excitation switch is closed, the main contact K1 of the de-excitation switch is opened, high arc voltage is generated at two ends of the main contact K1 of the de-excitation switch, when the arc voltage is higher than the sum of the conducting voltage of the de-excitation resistor R and the output voltage of the rectifier bridge, the de-excitation resistor R is conducted, and the coil energy is rapidly released through the de-excitation resistor. The demagnetizing speed depends on the conducting voltage of the demagnetizing resistor R, but too high conducting voltage can greatly improve the withstand voltage and insulation requirements of the demagnetizing switch K1 caused by too high arc voltage, and the existing demagnetizing switch cannot meet the too high voltage, so that the demagnetizing cannot be performed quickly, and the mechanical switch cannot meet the quick demagnetizing time due to longer contact action time of the demagnetizing switch.
Therefore, it is necessary to provide a de-excitation device to solve the technical problem that the de-excitation cannot be performed rapidly due to the defect of the structural performance of the de-excitation switch in the prior art.
Disclosure of Invention
The embodiment of the invention provides a rapid de-excitation method, which solves the technical problem that the rapid de-excitation cannot be performed due to the defect of the structural performance of a de-excitation switch in the prior art.
According to one aspect of the present invention, there is provided a rapid de-excitation apparatus comprising: the first piezoresistor, the plurality of switch tube modules and the controller;
the switching tube module includes: the first end and the second end of the switching tube are respectively connected with two poles of the diode, the second piezoresistor is connected with the diode in parallel, and the third end of the switching tube is connected with the controller;
the switch tube modules are sequentially connected in series to form a switch module, the switch module is connected with the current limiter winding in series and then connected with the first piezoresistor in parallel, and two ends of the first piezoresistor are connected with the output end of the rectifier bridge at the power supply side.
Preferably, the rapid demagnetizing device provided by the invention further comprises: a magnetic extinction switch;
the first end of the first piezoresistor is connected with the positive output end of the power supply side rectifier bridge through the main contact of the magnetic extinction switch;
the secondary contact of the magnetic extinction switch is connected with the first piezoresistor in parallel.
Preferably, the main contact is in a normally closed state, and the secondary contact is in a normally open state.
Preferably, the switching tube is an IGBT.
Preferably, the first piezoresistor and the second piezoresistor are zinc oxide.
According to another aspect of the present invention, there is provided a rapid de-excitation method, implemented by a rapid de-excitation device as described above, comprising:
when the quick demagnetizing device is in the quick demagnetizing mode, the controller adjusts output pulses to turn off all the switching tubes simultaneously after receiving a switching tube turn-off instruction of the excitation regulator at the power supply side.
Preferably, after receiving a switching tube turn-off instruction of the excitation regulator at the power supply side, the controller adjusts the output pulse to turn off all switching tubes simultaneously, and before further includes:
the magnetic extinction switch keeps a normal working state under the control of the excitation regulator, wherein the normal working state of the magnetic extinction switch is a state that a main contact is closed and a secondary contact is opened.
Preferably, the rapid de-excitation method provided by the invention further comprises the following steps:
when the quick demagnetizing device is in a normal demagnetizing mode, before and after the excitation regulator adjusts the trigger angle to the inversion angle, the demagnetizing switch and the controller are kept in a normal working state under the control of the excitation regulator, so that the energy of the current limiter winding is fed back to the power supply side, wherein the normal working state of the controller is a state of controlling all the switching tubes to be conducted.
Preferably, the rapid de-excitation method provided by the invention further comprises the following steps:
when the rapid demagnetizing device is in an accident demagnetizing mode, the controller keeps a normal working state under the control of the excitation regulator, and the demagnetizing switch opens the main contact and closes the secondary contact under the control of the excitation regulator, so that the current limiter winding and the secondary contact form a follow current loop.
From the above technical solutions, the embodiment of the present invention has the following advantages:
the invention provides a rapid de-excitation method, which comprises the following steps: the first piezoresistor, the plurality of switch tube modules and the controller; the switching tube module includes: the first end and the second end of the switching tube are respectively connected with the two poles of the diode, the second piezoresistor is connected with the diode in parallel, and the third end of the switching tube is connected with the controller; the switch modules are connected in series in sequence to form a switch module, and after being connected in series with the current limiter winding, the switch module is connected in parallel with the first piezoresistor, and two ends of the first piezoresistor are connected with the output end of the rectifier bridge at the power supply side. In the invention, when the fast de-excitation is needed, the controller can turn off all the switching tubes at the same time, the current limiter winding can induce voltage, and the voltage enables the energy on the winding to be fast released on the resistor for fast de-excitation after the first piezoresistor and the second piezoresistor are conducted.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art de-excitation system;
fig. 2 is a schematic structural diagram of an embodiment of a fast demagnetizing device provided by the present invention.
Detailed Description
The embodiment of the invention provides a rapid de-excitation method, which solves the technical problem that the rapid de-excitation cannot be performed due to the defect of the structural performance of a de-excitation switch in the prior art.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of a fast demagnetizing device provided by the present invention includes: a first varistor 1 and a plurality of switching tube modules and a controller 3;
the switching tube module includes: the first end and the second end of the switching tube 21 are respectively connected with the two poles of the diode 22, the second piezoresistor 23 is connected with the diode 22 in parallel, and the third end of the switching tube 21 is connected with the controller 3;
the switch modules are sequentially connected in series to form a switch module 2, the switch module 2 is connected in series with the current limiter winding 4 and then connected in parallel with the first piezoresistor 1, and two ends of the first piezoresistor 1 are connected with the output end of the rectifier bridge 5 at the power supply side.
Still further, the fast demagnetizing device provided by the present invention further includes: a magnetic extinction switch;
the first end of the first piezoresistor 1 is connected with the positive output end of the rectifier bridge 5 at the power supply side through the main contact 6 of the magnetic extinction switch, and the secondary contact 7 of the magnetic extinction switch is connected with the first piezoresistor 1 in parallel.
Further, when the entire system of fig. 2 is normally operated, the main contact 6 is normally set to a normally closed state, the sub-contacts 7 are normally set to a normally open state, and the respective switching tubes 21 are in an on state at this time.
Still further, all the switching tubes 21 in the present embodiment are typically selected as IGBTs.
Further, to achieve the optimal voltage clamping function, both the first varistor 1 and the second varistor 23 may be zinc oxide.
The working process of the quick demagnetizing device provided by the invention is described below, and it should be noted that the quick demagnetizing device provided by the embodiment of the invention has the demagnetizing functions in three modes:
as shown in fig. 2, when the whole system is in normal operation, under the control of the excitation regulator 8 on the power supply side, the main contact 6 is set to the closed state, the sub-contacts 7 are set to the open state, and at this time, the respective switching tubes 21 are set to the on state.
(1) When the monitoring terminal at one side of the current limiter winding 4 monitors that a short circuit fault occurs on the current limiter, a rapid de-excitation instruction is sent to the excitation regulator 8, and at the moment, when the rapid de-excitation device enters a rapid de-excitation mode, the excitation regulator 8 controls the de-excitation switch to keep a normal working state, and sends a switching tube switching-off instruction to the controller 3, so that the controller 3 adjusts output pulses and simultaneously switches off all switching tubes 21.
After each switching tube 21 is turned off, the current limiter winding 4 induces a reverse voltage, which turns on the first varistor 1 and the second varistor 23, and causes the winding to generate a higher reverse di/dt to accelerate the reduction of the exciting current of the winding, and the energy on the winding is rapidly released on the resistor, so that the exciting current is rapidly reduced to zero. Meanwhile, the resistor can limit voltage, and components in the circuit can be protected.
(2) When the excitation regulator 8 receives the excitation stop instruction sent by the monitoring terminal, the rapid demagnetizing device enters a normal demagnetizing mode. Under the condition that the magnetic extinction switch and the controller 3 are kept in a normal working state under the control of the excitation regulator 8, the excitation regulator 8 adjusts the trigger angle to an inversion angle, so that the energy of the current limiter winding 4 is fed back to the power supply side, wherein the normal working state of the controller 3 is a state of controlling all the switching tubes 21 to be conducted.
(3) When the excitation regulator 8 receives the excitation tripping instruction sent by the monitoring terminal (at this time, the power supply side fails), the rapid demagnetizing device enters an accident demagnetizing mode. The controller 3 keeps a normal working state under the control of the excitation regulator 8, and the demagnetizing switch opens the main contact 6 and closes the sub-contact 7 under the control of the excitation regulator 8, so that the current limiter winding 4 and the sub-contact 7 form a freewheeling circuit in which winding energy is consumed.
The rapid demagnetizing device provided by the invention has the following advantages:
1. and the IGBT element is used as an electronic switch to replace a mechanical switch, so that the switching action time is shortened.
2. The IGBT elements and the zinc oxide resistors are connected in parallel and then connected in series in multiple groups, so that the quick demagnetization is realized by improving the on voltage of the demagnetization resistor, and the withstand voltage and the insulation level of devices such as a main loop thyristor are not influenced.
3. The zinc oxide resistor can prevent overvoltage at the time of de-excitation to protect the IGBT element and windings.
The structure and the connection relation of the rapid demagnetizing device provided by the invention are described in detail, and the rapid demagnetizing method provided by the invention is described below, and one embodiment of the rapid demagnetizing method provided by the invention comprises the following steps:
when the quick demagnetizing device is in the quick demagnetizing mode, the controller adjusts output pulses to turn off all the switching tubes simultaneously after receiving a switching tube turn-off instruction of the excitation regulator at the power supply side.
Optionally, after receiving a switching tube turn-off instruction of the excitation regulator on the power supply side, the controller adjusts the output pulse to turn off all switching tubes simultaneously, and before further includes:
the magnetic extinction switch keeps a normal working state under the control of the excitation regulator, wherein the normal working state of the magnetic extinction switch is a state that a main contact is closed and a secondary contact is opened.
Optionally, the rapid de-excitation method provided by the invention further comprises the following steps:
when the quick demagnetizing device is in a normal demagnetizing mode, before and after the excitation regulator adjusts the trigger angle to the inversion angle, the demagnetizing switch and the controller are kept in a normal working state under the control of the excitation regulator, so that the energy of the current limiter winding is fed back to the power supply side, wherein the normal working state of the controller is a state of controlling all switching tubes to be conducted.
Optionally, the rapid de-excitation method provided by the invention further comprises the following steps:
when the quick demagnetizing device is in an accident demagnetizing mode, the controller keeps a normal working state under the control of the excitation regulator, and the demagnetizing switch opens the main contact and closes the secondary contact under the control of the excitation regulator, so that the current limiter winding and the secondary contact form a follow current loop.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a quick demagnetization method, realizes through a quick demagnetization device, its characterized in that, quick demagnetization device includes:
the device comprises a first piezoresistor, a plurality of switching tube modules, a controller and a magnetic extinction switch;
the switching tube module includes: the first end and the second end of the switching tube are respectively connected with two poles of the diode, the second piezoresistor is connected with the diode in parallel, and the third end of the switching tube is connected with the controller;
the switch tube modules are sequentially connected in series to form a switch module, the switch module is connected with the current limiter winding in series and then connected with the first piezoresistor in parallel, and two ends of the first piezoresistor are connected with the output end of the rectifier bridge at the power supply side;
the first end of the first piezoresistor is connected with the positive output end of the power supply side rectifier bridge through the main contact of the magnetic extinction switch;
the secondary contact of the magnetic extinction switch is connected with the first piezoresistor in parallel;
the rapid de-excitation method comprises the following steps:
the magnetic extinction switch keeps a normal working state under the control of the excitation regulator, wherein the normal working state of the magnetic extinction switch is a state that a main contact is closed and a secondary contact is opened;
when the rapid demagnetizing device is in a rapid demagnetizing mode, the controller adjusts output pulses to simultaneously turn off all switching tubes after receiving a switching tube turn-off instruction of the excitation regulator at the power supply side;
when the quick demagnetizing device is in a normal demagnetizing mode, before and after the excitation regulator adjusts the trigger angle to the inversion angle, the demagnetizing switch and the controller are kept in a normal working state under the control of the excitation regulator, so that the energy of the current limiter winding is fed back to the power supply side, wherein the normal working state of the controller is a state of controlling all the switching tubes to be conducted.
2. The rapid de-excitation method of claim 1, further comprising:
when the rapid demagnetizing device is in an accident demagnetizing mode, the controller keeps a normal working state under the control of the excitation regulator, and the demagnetizing switch opens the main contact and closes the secondary contact under the control of the excitation regulator, so that the current limiter winding and the secondary contact form a follow current loop.
3. The rapid de-excitation method of claim 1, wherein the primary contact is normally closed and the secondary contact is normally open.
4. A rapid de-excitation method according to any one of claims 1 to 3, wherein the switching tube is an IGBT.
5. A rapid de-excitation method according to any one of claims 1 to 3, wherein the first piezo-resistor and the second piezo-resistor are both zinc oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811215999.6A CN109066632B (en) | 2018-10-18 | 2018-10-18 | Rapid de-excitation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811215999.6A CN109066632B (en) | 2018-10-18 | 2018-10-18 | Rapid de-excitation method |
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| CN109066632A CN109066632A (en) | 2018-12-21 |
| CN109066632B true CN109066632B (en) | 2024-01-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4036636A1 (en) * | 1990-11-16 | 1992-05-21 | Siemens Ag | Circuit with input terminals fed by supply voltage - has smoothing capacitor arranged parallel to output terminals and series circuit of inductance and magnetic controlled resistance at input |
| WO1996038893A1 (en) * | 1995-05-30 | 1996-12-05 | Siemens Aktiengesellschaft | Free-wheel circuit with an adjustable off delay time |
| CN101546908A (en) * | 2008-03-28 | 2009-09-30 | 北京云电英纳超导电缆有限公司 | Saturated iron core type superconducting current limiter with direct current control system and method for controlling same |
| CN208707304U (en) * | 2018-10-18 | 2019-04-05 | 广东电网有限责任公司 | A kind of quick de-excitation device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101108664B1 (en) * | 2007-04-17 | 2012-01-25 | 이노파워 수퍼컨덕터 케이블 씨오. 엘티디. | Core-saturated superconductive fault current limiter and control method of the fault current limiter |
| CN102077305B (en) * | 2008-08-27 | 2012-09-12 | 赖茵豪森机械制造公司 | Tap switch with semiconductor switching elements |
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2018
- 2018-10-18 CN CN201811215999.6A patent/CN109066632B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| DE4036636A1 (en) * | 1990-11-16 | 1992-05-21 | Siemens Ag | Circuit with input terminals fed by supply voltage - has smoothing capacitor arranged parallel to output terminals and series circuit of inductance and magnetic controlled resistance at input |
| WO1996038893A1 (en) * | 1995-05-30 | 1996-12-05 | Siemens Aktiengesellschaft | Free-wheel circuit with an adjustable off delay time |
| CN101546908A (en) * | 2008-03-28 | 2009-09-30 | 北京云电英纳超导电缆有限公司 | Saturated iron core type superconducting current limiter with direct current control system and method for controlling same |
| CN208707304U (en) * | 2018-10-18 | 2019-04-05 | 广东电网有限责任公司 | A kind of quick de-excitation device |
Non-Patent Citations (2)
| Title |
|---|
| 浅论压敏电阻灭磁装置的应用;谢飞虎;邓志宏;;中国水能及电气化(第05期);第44-46页 * |
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