CN114094618B - Soft direct current converter valve submodule fault prediction method - Google Patents
Soft direct current converter valve submodule fault prediction method Download PDFInfo
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- CN114094618B CN114094618B CN202111458770.7A CN202111458770A CN114094618B CN 114094618 B CN114094618 B CN 114094618B CN 202111458770 A CN202111458770 A CN 202111458770A CN 114094618 B CN114094618 B CN 114094618B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000630 rising effect Effects 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a soft direct current converter valve submodule fault prediction method which comprises the following steps: s1, judging the electrifying state of the sub-module, wherein the electrifying state is divided into a charging state or a discharging state; s2, if the submodule is in a charging state, determining the voltage rising rate of the submodule; if the submodule is in a discharge state, determining the voltage drop rate of the submodule; calculating a voltage predicted value after a preset time according to the voltage rising rate and the voltage falling rate of the submodule; s3, comparing the voltage predicted value calculated in the S2 with the actual value of the voltage of the submodule after the preset time, if the deviation between the voltage prediction and the actual value of the voltage is within a normal range, the operation of the prediction submodule is normal, and if the deviation exceeds the normal range, the fault of the submodule is predicted. The invention can predict the abnormal operation of the sub-module, and adopts protective measures in advance through the pretreatment mechanism, thereby preventing the fault of the sub-module from spreading, reducing the loss and improving the operation reliability of the soft direct current converter valve.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a soft direct current converter valve submodule fault prediction method.
Background
With the development of power electronics technology and the large number of accesses of distributed power sources and direct current loads, flexible alternating current-direct current interconnection systems are increasingly widely applied, flexible direct current transmission is a new generation of high-voltage direct current transmission technology adopting a voltage source converter, and in recent years, flexible direct current transmission technology adopting a modularized multi-level (MMC) technical route in China has started to enter an engineering application stage. The modularized multi-level flexible direct current transmission converter valve is formed by serially connecting submodules, is core main equipment of a flexible direct current transmission converter station, and is used for completing energy conversion of an alternating current system and a direct current system. The bridge arm of the existing converter valve is composed of n sub-modules.
Because of the large number of sub-modules, the safe and reliable operation of the sub-modules of the converter valve is particularly important, and the existing method for analyzing the on-line faults of the sub-modules in operation is lacking, the early prediction of the faults of the sub-modules cannot be realized, so that a soft direct-current converter valve sub-module fault prediction method is required to be designed.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a soft direct current converter valve submodule fault prediction method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a soft direct current converter valve submodule fault prediction method comprises the following steps:
s1, judging the electrifying state of the sub-module, wherein the electrifying state is divided into a charging state or a discharging state;
s2, if the submodule is in a charging state, determining the voltage rising rate of the submodule; if the submodule is in a discharge state, determining the voltage drop rate of the submodule; calculating a voltage predicted value after a preset time according to the voltage rising rate and the voltage falling rate of the submodule;
s3, comparing the voltage predicted value calculated in the S2 with the actual value of the voltage of the submodule after the preset time, if the deviation between the voltage prediction and the actual value of the voltage is in a normal range, the operation of the prediction submodule is normal, and if the deviation exceeds the normal range, the fault of the prediction submodule is predicted;
and S4, locking the submodule for predicting the faults in the step S3, connecting the standby submodule into a bridge arm of the converter valve by utilizing a pretreatment mechanism, and simultaneously disconnecting and isolating the submodule for predicting the faults from the bridge arm of the converter valve.
As a further improvement of the invention, the pretreatment mechanism in the S4 comprises a mounting rod, mounting structures are arranged at two ends of the mounting rod, a first electric sliding rail is fixedly arranged on the upper side wall of the mounting rod, a first movable seat is arranged on the first electric sliding rail, the upper end of the first movable seat is fixedly connected with a bottom plate, a top plate is arranged above the bottom plate, two second electric sliding rails are arranged between the bottom plate and the top plate, the two second electric sliding rails are symmetrically arranged left and right, a second movable seat is arranged on each of the two second electric sliding rails, a first mounting plate is fixedly connected between the two second movable seats, two first electric telescopic rods are fixedly arranged on the side wall of each of the first mounting plates, the telescopic ends of the two first electric telescopic rods penetrate through the first mounting plates, the telescopic ends of the two first electric telescopic rods are fixedly connected with the same second mounting plates, and one side, far away from the first electric telescopic rods, of each second mounting plate is provided with a stretching structure.
As a further improvement of the invention, the mounting structure comprises a fixed hoop fixedly connected to the end part of the mounting rod, a movable hoop matched with the fixed hoop is arranged on the side surface of the fixed hoop, and the movable hoop and the fixed hoop are mounted and fixed through a mounting bolt.
As a further improvement of the invention, the extending structure comprises two guide rods fixedly connected to the side wall of the second mounting plate, the two guide rods are symmetrically arranged left and right, the upper side walls of the two guide rods are fixedly provided with third electric sliding rails, the two third electric sliding rails are respectively provided with a third movable seat, a movable plate is fixedly connected between the two third movable seats, and the upper ends of the movable plates are symmetrically provided with two clamping assemblies.
As a further improvement of the invention, the clamping assembly comprises a mounting seat fixedly connected to the upper end of the movable plate, a second electric telescopic rod is fixedly arranged on the side wall of the mounting seat, and the telescopic end of the second electric telescopic rod penetrates through the mounting seat and is fixedly connected with the clamping seat.
As a further improvement of the invention, the lower side wall of one end of the guide rod far away from the second mounting plate is fixedly connected with a supporting foot.
As a further improvement of the invention, the surface of the supporting feet is coated with an insulating coating.
As a further improvement of the invention, the number of the mounting bolts is four, and the four mounting bolts are distributed in a rectangular shape.
The invention has the beneficial effects that:
through setting up pretreatment mechanism, can adjust the transverse position and the height that stretch into the structure in a flexible way, and then can be swiftly with reserve sub-module through stretch into the structure quick positioning and insert in the converter valve bridge arm, and then can take the safeguard measure in advance, prevent the trouble of sub-module and spread, reduce the loss.
The invention can predict the abnormal operation of the sub-module, and adopts protective measures in advance through the pretreatment mechanism, thereby preventing the fault of the sub-module from spreading, reducing the loss and improving the operation reliability of the soft direct current converter valve.
Drawings
Fig. 1 is a schematic structural diagram of a pretreatment mechanism of a soft direct current converter valve submodule fault prediction method according to the present invention;
fig. 2 is a schematic structural diagram of a first mounting plate, a first electric telescopic rod, a second mounting plate and an extending structure of a pretreatment mechanism of a soft direct current converter valve submodule fault prediction method provided by the invention;
fig. 3 is a schematic structural diagram of a guide rod and a support leg of a pretreatment mechanism of a soft direct current converter valve submodule fault prediction method according to the present invention;
fig. 4 is a schematic structural diagram of an installation structure of a pretreatment mechanism of a soft direct current converter valve submodule fault prediction method according to the present invention.
In the figure: the movable hoop comprises a fixed hoop body 1, a mounting bolt 2, a mounting rod 3, a first electric sliding rail 4, a first movable seat 5, a bottom plate 6, a second electric sliding rail 7, a second movable seat 8, a top plate 9, a first mounting plate 10, a first electric telescopic rod 11, a second mounting plate 12, a guide rod 13, a third electric sliding rail 14, a third movable seat 15, a movable plate 16, a clamping seat 17, a mounting seat 18, a second electric telescopic rod 19, a supporting leg 20 and a movable hoop 21.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
A soft direct current converter valve submodule fault prediction method comprises the following steps:
s1, judging the electrifying state of the sub-module, wherein the electrifying state is divided into a charging state or a discharging state;
s2, if the submodule is in a charging state, determining the voltage rising rate of the submodule; if the submodule is in a discharge state, determining the voltage drop rate of the submodule; calculating a voltage predicted value after a preset time according to the voltage rising rate and the voltage falling rate of the submodule;
s3, comparing the voltage predicted value calculated in the S2 with the actual value of the voltage of the submodule after the preset time, if the deviation between the voltage prediction and the actual value of the voltage is in a normal range, the operation of the prediction submodule is normal, and if the deviation exceeds the normal range, the fault of the prediction submodule is predicted;
and S4, locking the submodule for predicting the faults in the step S3, connecting the standby submodule into a bridge arm of the converter valve by utilizing a pretreatment mechanism, and simultaneously disconnecting and isolating the submodule for predicting the faults from the bridge arm of the converter valve.
Referring to fig. 1-4, in the invention, the pretreatment mechanism in S4 comprises a mounting rod 3, mounting structures are arranged at two ends of the mounting rod 3, a first electric sliding rail 4 is fixedly arranged on the upper side wall of the mounting rod 3, a first movable seat 5 is arranged on the first electric sliding rail 4, the upper end of the first movable seat 5 is fixedly connected with a bottom plate 6, the first movable seat 5 can be driven to move transversely through the first electric sliding rail 4, the transverse position of a standby sub-module is flexibly adjusted, the transverse position corresponds to the transverse position of a failure sub-module, a top plate 9 is arranged above the bottom plate 6, two second electric sliding rails 7 are symmetrically arranged left and right between the bottom plate 6 and the top plate 9, two second movable seats 8 are arranged on the two second electric sliding rails 7, a first mounting plate 10 is fixedly connected between the two second movable seats 8, the second movable seats 8 are driven to move vertically through the second electric sliding rails 7, the vertical position of the standby sub-module can be flexibly adjusted, the standby sub-module corresponds to the vertical position of the failure sub-module, two first electric telescopic rods 11 are fixedly arranged on the side wall of the first mounting plate 10, the telescopic ends of the two first electric telescopic rods 11 penetrate through the first mounting plate 10, the telescopic ends of the two first electric telescopic rods 11 are fixedly connected with the same second mounting plate 12, one side of the second mounting plate 12 away from the first electric telescopic rods 11 is provided with an extending structure, the second mounting plate 12 is driven to move by extending through the first electric telescopic rods 11, the extending structure can be driven to extend into the inner side of the converter valve tower, the extending structure extends into the inner side of the valve tower more conveniently, the pretreatment work is convenient to carry out, the extending structure is driven to move out to the outer side of the converter valve tower by retracting the first electric telescopic rods 11, and the vertical and horizontal positions of the standby submodule on the outer side of the converter valve tower are not influenced.
The mounting structure includes fixed hoop 1 of fixed connection at the installation pole 3 tip, and the side of fixed hoop 1 is equipped with rather than complex activity hoop 21, and activity hoop 21 passes through mounting bolt 2 installation with fixed hoop 1 and is fixed, and the quantity of mounting bolt 2 is four, and four mounting bolts 2 are the rectangle and distribute, through using mounting bolt 2 to fix the pylon lower part at the valve pylon with fixed hoop 1 and activity hoop 21, can install pretreatment device on the valve pylon of converter valve.
The extending structure comprises two guide rods 13 fixedly connected to the side wall of the second mounting plate 12, the two guide rods 13 are symmetrically arranged left and right, a supporting leg 20 is fixedly connected to the lower side wall of one end, far away from the second mounting plate 12, of the guide rod 13, the guide rods 13 can be supported and connected to a valve tower below the sub-module through the supporting leg 20, the guide rods 13 are supported and fixed, insulating coatings are coated on the surfaces of the supporting legs 20 to insulate the supporting legs 20 from the valve tower, third electric sliding rails 14 are fixedly arranged on the upper side walls of the two guide rods 13, third movable seats 15 are respectively arranged on the two third electric sliding rails 14, a movable plate 16 is fixedly connected between the two third movable seats 15, two clamping assemblies are symmetrically arranged at the upper end of the movable plate 16, and the third movable seats 15 are driven to move through the third electric sliding rails 14, so that the spare sub-module can move on the inner side of the valve tower of the converter valve, and the fault is greatly conveniently preprocessed;
the clamping assembly comprises a mounting seat 18 fixedly connected to the upper end of the movable plate 16, a second electric telescopic rod 19 is fixedly mounted on the side wall of the mounting seat 18, the telescopic end of the second electric telescopic rod 19 penetrates through the mounting seat 18 and is fixedly connected with a clamping seat 17, the standby submodule is fixed through the two clamping seats 17, and then the stability of the standby submodule in moving is guaranteed.
The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.
Claims (4)
1. The soft direct current converter valve submodule fault prediction method is characterized by comprising the following steps of:
s1, judging the electrifying state of the sub-module, wherein the electrifying state is divided into a charging state or a discharging state;
s2, if the submodule is in a charging state, determining the voltage rising rate of the submodule; if the submodule is in a discharge state, determining the voltage drop rate of the submodule; calculating a voltage predicted value after a preset time according to the voltage rising rate and the voltage falling rate of the submodule;
s3, comparing the voltage predicted value calculated in the S2 with the actual value of the voltage of the submodule after the preset time, if the deviation between the voltage predicted value and the actual value of the voltage is in a normal range, the operation of the prediction submodule is normal, and if the deviation exceeds the normal range, the fault of the prediction submodule is predicted;
s4, locking the submodule for predicting the faults in the S3, connecting the standby submodule into a bridge arm of the converter valve by utilizing a pretreatment mechanism, and simultaneously disconnecting and isolating the submodule for predicting the faults from the bridge arm of the converter valve;
the pretreatment mechanism in the S4 comprises a mounting rod (3), mounting structures are arranged at two ends of the mounting rod (3), a first electric sliding rail (4) is fixedly arranged on the upper side wall of the mounting rod (3), a first moving seat (5) is arranged on the first electric sliding rail (4), a bottom plate (6) is fixedly connected to the upper end of the first moving seat (5), a top plate (9) is arranged above the bottom plate (6), two second electric sliding rails (7) are arranged between the bottom plate (6) and the top plate (9), the two second electric sliding rails (7) are symmetrically arranged left and right, a second moving seat (8) is arranged on each second electric sliding rail (7), two first mounting plates (10) are fixedly connected between the second moving seats (8), two first electric telescopic rods (11) are fixedly arranged on the side wall of each first mounting plate (10), the telescopic ends of the two first electric telescopic rods (11) penetrate through the first mounting plates (10), and the two first electric telescopic rods (11) are connected with the first mounting plates (12) in a telescopic manner, and the two first telescopic ends of the first electric telescopic rods (12) are far away from the first mounting plates (12);
the mounting structure comprises a fixed hoop (1) fixedly connected to the end part of a mounting rod (3), a movable hoop (21) matched with the fixed hoop (1) is arranged on the side surface of the fixed hoop (1), and the movable hoop (21) and the fixed hoop (1) are fixedly mounted through a mounting bolt (2);
the extending structure comprises two guide rods (13) fixedly connected to the side wall of the second mounting plate (12), the two guide rods (13) are symmetrically arranged left and right, third electric sliding rails (14) are fixedly arranged on the upper side wall of each guide rod (13), third movable seats (15) are arranged on each third electric sliding rail (14), a movable plate (16) is fixedly connected between the two third movable seats (15), and two clamping assemblies are symmetrically arranged at the upper ends of the movable plates (16);
the clamping assembly comprises a mounting seat (18) fixedly connected to the upper end of the movable plate (16), a second electric telescopic rod (19) is fixedly mounted on the side wall of the mounting seat (18), and the telescopic end of the second electric telescopic rod (19) penetrates through the mounting seat (18) and is fixedly connected with a clamping seat (17).
2. The soft direct current converter valve submodule fault prediction method according to claim 1, wherein a supporting leg (20) is fixedly connected to the lower side wall of one end of the guide rod (13) far away from the second mounting plate (12).
3. A soft direct current converter valve submodule failure prediction method according to claim 2, characterized in that the surface of the support leg (20) is coated with an insulating coating.
4. A soft direct current converter valve submodule fault prediction method according to claim 3, characterized in that the number of the mounting bolts (2) is four, and the four mounting bolts (2) are distributed in a rectangular shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458770.7A CN114094618B (en) | 2021-12-02 | 2021-12-02 | Soft direct current converter valve submodule fault prediction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458770.7A CN114094618B (en) | 2021-12-02 | 2021-12-02 | Soft direct current converter valve submodule fault prediction method |
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| Publication Number | Publication Date |
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| CN114094618A CN114094618A (en) | 2022-02-25 |
| CN114094618B true CN114094618B (en) | 2023-12-01 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122688A1 (en) * | 2011-03-16 | 2012-09-20 | 中国电力科学研究院 | Valve current control method based on modular multi-level converter |
| CN203486842U (en) * | 2013-09-10 | 2014-03-19 | 国家电网公司 | Valve outer air cooling system motor replace device |
| CN106026157A (en) * | 2016-06-13 | 2016-10-12 | 许继集团有限公司 | Failure prediction method and device of flexible direct-current transmission convertor valve sub-module |
| CN109462165A (en) * | 2018-11-08 | 2019-03-12 | 西安西电电力系统有限公司 | The provision for disengagement and control method of flexible direct current converter valve power module |
| CN110240058A (en) * | 2019-06-13 | 2019-09-17 | 常州博瑞电力自动化设备有限公司 | Mould group transfer device, valve tower mould group more changing device and valve tower mould set replacement method |
| CN111371031A (en) * | 2020-03-18 | 2020-07-03 | 南通苏源恒炫电气有限公司 | Intelligent withdrawable high-voltage circuit breaker |
| CN211338681U (en) * | 2019-12-24 | 2020-08-25 | 天津捷信德供应链管理股份有限公司 | Logistics device convenient to mount and dismount |
| CN211940695U (en) * | 2019-11-28 | 2020-11-17 | 广东电科院能源技术有限责任公司 | Change equipment of converter valve power module |
| CN213294555U (en) * | 2020-09-16 | 2021-05-28 | 辽东学院 | Moving device for well plugging device of drilling machine |
-
2021
- 2021-12-02 CN CN202111458770.7A patent/CN114094618B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122688A1 (en) * | 2011-03-16 | 2012-09-20 | 中国电力科学研究院 | Valve current control method based on modular multi-level converter |
| CN203486842U (en) * | 2013-09-10 | 2014-03-19 | 国家电网公司 | Valve outer air cooling system motor replace device |
| CN106026157A (en) * | 2016-06-13 | 2016-10-12 | 许继集团有限公司 | Failure prediction method and device of flexible direct-current transmission convertor valve sub-module |
| CN109462165A (en) * | 2018-11-08 | 2019-03-12 | 西安西电电力系统有限公司 | The provision for disengagement and control method of flexible direct current converter valve power module |
| CN110240058A (en) * | 2019-06-13 | 2019-09-17 | 常州博瑞电力自动化设备有限公司 | Mould group transfer device, valve tower mould group more changing device and valve tower mould set replacement method |
| CN211940695U (en) * | 2019-11-28 | 2020-11-17 | 广东电科院能源技术有限责任公司 | Change equipment of converter valve power module |
| CN211338681U (en) * | 2019-12-24 | 2020-08-25 | 天津捷信德供应链管理股份有限公司 | Logistics device convenient to mount and dismount |
| CN111371031A (en) * | 2020-03-18 | 2020-07-03 | 南通苏源恒炫电气有限公司 | Intelligent withdrawable high-voltage circuit breaker |
| CN213294555U (en) * | 2020-09-16 | 2021-05-28 | 辽东学院 | Moving device for well plugging device of drilling machine |
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| CN114094618A (en) | 2022-02-25 |
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