CN113872158A - IGCT device converter station locking method, system and storage medium - Google Patents
IGCT device converter station locking method, system and storage medium Download PDFInfo
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- CN113872158A CN113872158A CN202111320076.9A CN202111320076A CN113872158A CN 113872158 A CN113872158 A CN 113872158A CN 202111320076 A CN202111320076 A CN 202111320076A CN 113872158 A CN113872158 A CN 113872158A
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- fault
- converter station
- igct
- direct current
- igct device
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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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
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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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/122—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 for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
-
- 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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/125—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 for converters; for rectifiers for static converters or rectifiers for rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a locking method, a locking system and a storage medium for an IGCT device converter station, wherein when the IGCT device converter station has a fault, whether the fault area is in a direct current side area is determined, if so, a signal is firstly sent to trip a flexible direct current transformer inlet wire switch, and then a converter valve locking instruction is sent, which is equivalent to the characteristic of zero-crossing cutting of the current of the inlet wire switch, so that the current change rate in fault cutting is reduced, the overvoltage on an inductive element of a loop is reduced, the insulation level of the inductive element is improved without increasing the equipment cost, and the engineering resources are saved.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a locking method, a locking system and a storage medium for an IGCT device converter station.
Background
With the rapid development of the turn-off thyristor, the development of direct current transmission is greatly promoted, a voltage source converter (VSG) and IGBT-based flexible direct current transmission technology appears, and at present, a large amount of flexible direct current transmission projects based on IGBT devices are applied. However, because the current endurance capability of the IGBT device itself is low (about 2 times of the rated value), once the converter station fails, the protection system will be required to quickly block the converter valve to limit the transient current flowing through the IGBT; on the other hand, since the IGBT device cuts off the current for an extremely short time, usually in the order of ns, a large amount of di/dt (current rise rate) is generated when cutting off the fault current, and the rapid change in the bridge arm current causes an appreciable overvoltage to occur in the inductive element in the circuit, and the insulation level of the inductive element can be increased only by increasing the equipment cost.
Compared with an IGBT, the IGCT has the advantages of lower on-state voltage drop, higher reliability, lower manufacturing cost, compact structure, higher blocking voltage and current capacity, is expected to improve the performance and performance of the IGBT in high-voltage and high-capacity application, and can replace the IGBT in the upgrading and updating process of the flexible direct current technology in the future. However, the existing IGBT locking strategy cannot be directly applied to the IGCT device converter station, and therefore, it is necessary to provide a locking strategy suitable for the IGCT device converter station to reduce the overvoltage on the inductive element of the loop when the fault current is cut off, without increasing the equipment cost to improve the insulation level of the inductive element, so as to save the engineering resources.
Disclosure of Invention
The invention provides a locking method, a locking system and a storage medium for an IGCT device converter station, which are used for reducing overvoltage on an inductive element of a loop when fault current is cut off, and do not need to increase equipment cost to improve the insulation level of the inductive element, thereby saving engineering resources.
In view of the above, a first aspect of the present invention provides a method for locking a converter station of an IGCT device, including:
detecting whether the converter station of the IGCT device has a fault in real time;
if the IGCT device converter station is detected to have a fault, positioning a fault area and determining whether the fault area is in a direct current side area;
if the fault area is in the direct current side area, a tripping flexible direct current transformer incoming line switch instruction is sent out through the protection device, so that the protection device trips the flexible direct current transformer incoming line switch, and a fault loop is cut off;
and detecting whether the inlet switch of the flexible direct current transformer is in the opening position, if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
Optionally, locating the fault area includes:
and positioning the fault area through the corresponding action protection type when the fault occurs, and determining whether the fault area is in the direct current side area.
Optionally, the detecting whether the converter station fails in real time includes:
and detecting whether the electrical quantity of the IGCT device converter station is suddenly changed in real time, and judging whether the IGCT device converter station has a fault, wherein the electrical quantity comprises voltage and current.
The invention provides a locking system of a converter station of an IGCT device in a second aspect, which comprises:
the fault detection unit is used for detecting whether the IGCT device converter station has a fault in real time;
the fault positioning unit is used for positioning a fault area and determining whether the fault area is in a direct current side area or not if the IGCT device converter station is detected to have a fault;
the fault cutting-off unit is used for sending a flexible direct current transformer incoming line switch jumping instruction through the protection device if the fault area is in the direct current side area, so that the protection device jumps the flexible direct current transformer incoming line switch, and a fault loop is cut off;
and the converter valve locking unit is used for detecting whether the inlet wire switch of the flexible direct current transformer is in the opening position or not, and if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
Optionally, the fault location unit is specifically configured to:
and if the IGCT device converter station is detected to have a fault, positioning the fault region through the corresponding action protection type when the fault occurs, and determining whether the fault region is in the direct current side region.
Optionally, the fault detection unit is specifically configured to:
and detecting whether the electrical quantity of the IGCT device converter station is suddenly changed in real time, and judging whether the IGCT device converter station has a fault, wherein the electrical quantity comprises voltage and current.
A third aspect of the invention provides a computer readable storage medium for storing program code for performing the IGCT device converter station lockout method of any of the first aspects.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides a locking method of an IGCT device converter station, which is characterized in that when the IGCT device converter station has a fault, whether the fault area is in a direct current side area is determined, if yes, a signal is firstly sent to trip off an inlet switch of a flexible direct current transformer, and then a converter valve locking instruction is sent, namely, the current change rate in fault cutting is reduced by utilizing the characteristic of zero-crossing cutting of the current of the inlet switch, so that the overvoltage on an inductive element of a loop is reduced, the insulation level of the inductive element is improved without increasing the equipment cost, and engineering resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a locking method for a converter station of an IGCT device according to an embodiment of the present invention;
fig. 2 is a current structure topology diagram of a converter station of an IGCT device provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a locking system of a converter station of an IGCT device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For easy understanding, referring to fig. 1, an embodiment of a locking method for a converter station of an IGCT device is provided in the present invention, which includes:
It should be noted that the fault sensing manner of the converter station of the IGCT device may be sensing by sudden changes of electric quantities such as current, voltage, etc.
And 102, if the IGCT device converter station is detected to have a fault, positioning a fault area and determining whether the fault area is in a direct current side area.
When sensing that the converter station of the IGCT device has a fault, the fault area is located by a fault location method, so as to determine whether the fault area is in the dc side area or the ac side area. The fault location method of the invention is to locate the fault area by the corresponding action protection type when the fault occurs. For example, since the operation protection type IS differential protection, as shown in fig. 2, a differential current IS inevitably generated between ISR and IS PT in the case of a fault at the F1 position on the ac side, once | ISR-IS | > Δ can be determined as an ac zone fault, and similarly, a fault at the F2 position on the dc side can be determined by | IBP-IDCH | > Δ.
And 103, if the fault area is in the direct current side area, sending a flexible direct current transformer incoming line switch jumping instruction through the protection device, so that the protection device jumps the flexible direct current transformer incoming line switch, and cutting off a fault loop.
If the fault occurs in the direct current side area, a tripping flexible direct current transformer incoming line switch instruction is sent out through the protection device, the flexible direct current transformer incoming line switch is tripped, and a fault loop is cut off. If a fault occurs on the ac side, the protection system does not act.
And 104, detecting whether the inlet wire switch of the flexible direct current transformer is in the opening position, and if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
It should be noted that, after the fault loop is cut off, whether the inlet switch of the flexible dc transformer is in the open position is detected, and if yes, a locking IGCT signal is sent out, so that the converter station of the IGCT device is locked. And if the inlet switch of the flexible direct current transformer is not at the opening position, the locking IGCT signal is not sent out.
The embodiment of the invention provides a locking method of an IGCT device converter station, which is characterized in that when the IGCT device converter station has a fault, whether the fault area is in a direct current side area is determined, if yes, a signal is firstly sent to trip a flexible direct current transformer incoming line switch, and then a converter valve locking instruction is sent, namely, the current change rate in fault cutting is reduced by utilizing the characteristic that the current of the incoming line switch is cut off by zero crossing, so that the overvoltage on an inductive element of a loop is reduced, the equipment cost is not required to be increased to improve the insulation level of the inductive element, and the engineering resources are saved.
For ease of understanding, referring to fig. 3, an embodiment of a locking system for a converter station of an IGCT device is provided, comprising:
the fault detection unit 301 is used for detecting whether the converter station of the IGCT device has a fault in real time;
a fault location unit 302, configured to locate a fault region and determine whether the fault region is in a dc side region if it is detected that the converter station of the IGCT device has a fault;
the fault cutting-off unit 303 is configured to send a flexible direct-current transformer incoming line switch tripping instruction through the protection device if the fault area is in the direct-current side area, so that the protection device trips the flexible direct-current transformer incoming line switch, and a fault loop is cut off;
and the converter valve locking unit 304 is used for detecting whether the inlet switch of the flexible direct-current transformer is in the opening position, and if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
The fault location unit 302 is specifically configured to:
if the fault of the converter station of the IGCT device is detected, the fault area is positioned according to the corresponding action protection type when the fault occurs, and whether the fault area is in the direct-current side area or not is determined
The fault detection unit 301 is specifically configured to:
and detecting whether the electrical quantity of the IGCT device converter station is suddenly changed in real time, and judging whether the IGCT device converter station has a fault, wherein the electrical quantity comprises voltage and current.
The embodiment of the invention provides a locking system of an IGCT device converter station, which is characterized in that when the IGCT device converter station has a fault, whether the fault area is in a direct current side area is determined, if yes, a signal is firstly sent to trip off a line inlet switch of a flexible direct current transformer, and then a converter valve locking instruction is sent, namely, the current change rate in fault cutting is reduced by utilizing the characteristic of zero-crossing cutting of the current of the line inlet switch, so that the overvoltage on inductive elements of a loop is reduced, the equipment cost is not required to be increased to improve the insulation level of the inductive elements, and the engineering resources are saved.
Embodiments of the present invention also provide a computer readable storage medium for storing program code for an IGCT device converter station lockout method of the aforementioned IGCT device converter station lockout method embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An IGCT device converter station locking method is characterized by comprising the following steps:
detecting whether the converter station of the IGCT device has a fault in real time;
if the IGCT device converter station is detected to have a fault, positioning a fault area and determining whether the fault area is in a direct current side area;
if the fault area is in the direct current side area, a tripping flexible direct current transformer incoming line switch instruction is sent out through the protection device, so that the protection device trips the flexible direct current transformer incoming line switch, and a fault loop is cut off;
and detecting whether the inlet switch of the flexible direct current transformer is in the opening position, if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
2. The IGCT device converter station lockout method of claim 1 wherein locating the fault region comprises:
and positioning the fault area through the corresponding action protection type when the fault occurs, and determining whether the fault area is in the direct current side area.
3. The IGCT device converter station lockout method of claim 1, wherein detecting whether a converter station is malfunctioning in real time comprises:
and detecting whether the electrical quantity of the IGCT device converter station is suddenly changed in real time, and judging whether the IGCT device converter station has a fault, wherein the electrical quantity comprises voltage and current.
4. An IGCT device converter station lockout system, comprising:
the fault detection unit is used for detecting whether the IGCT device converter station has a fault in real time;
the fault positioning unit is used for positioning a fault area and determining whether the fault area is in a direct current side area or not if the IGCT device converter station is detected to have a fault;
the fault cutting-off unit is used for sending a flexible direct current transformer incoming line switch jumping instruction through the protection device if the fault area is in the direct current side area, so that the protection device jumps the flexible direct current transformer incoming line switch, and a fault loop is cut off;
and the converter valve locking unit is used for detecting whether the inlet wire switch of the flexible direct current transformer is in the opening position or not, and if so, sending a locking IGCT signal to lock the converter station of the IGCT device.
5. The IGCT device converter station lockout system of claim 4, wherein the fault locating unit is specifically configured to:
and if the IGCT device converter station is detected to have a fault, positioning the fault region through the corresponding action protection type when the fault occurs, and determining whether the fault region is in the direct current side region.
6. The IGCT device converter station lockout system of claim 4, wherein the fault detection unit is specifically configured to:
and detecting whether the electrical quantity of the IGCT device converter station is suddenly changed in real time, and judging whether the IGCT device converter station has a fault, wherein the electrical quantity comprises voltage and current.
7. A computer readable storage medium, characterized in that the computer readable storage medium is used for storing program code for performing the IGCT device converter station lockout method of any of claims 1-3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111320076.9A CN113872158B (en) | 2021-11-09 | 2021-11-09 | IGCT device converter station locking method, system and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111320076.9A CN113872158B (en) | 2021-11-09 | 2021-11-09 | IGCT device converter station locking method, system and storage medium |
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| CN113872158B CN113872158B (en) | 2023-08-04 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066573A (en) * | 2012-12-13 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level multi-terminal flexible direct current system direct current fault handling method |
| CN205509845U (en) * | 2016-03-28 | 2016-08-24 | 许继电气股份有限公司 | Quick isolating device of MMC direct current trouble |
| CN111463761A (en) * | 2020-04-09 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | Direct-current fault protection and control method of multi-terminal flexible direct-current system |
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- 2021-11-09 CN CN202111320076.9A patent/CN113872158B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066573A (en) * | 2012-12-13 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level multi-terminal flexible direct current system direct current fault handling method |
| CN205509845U (en) * | 2016-03-28 | 2016-08-24 | 许继电气股份有限公司 | Quick isolating device of MMC direct current trouble |
| CN111463761A (en) * | 2020-04-09 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | Direct-current fault protection and control method of multi-terminal flexible direct-current system |
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| CN113872158B (en) | 2023-08-04 |
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