CN109541348B - Converter valve submodule controller and driving fault judging method - Google Patents
Converter valve submodule controller and driving fault judging method Download PDFInfo
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- CN109541348B CN109541348B CN201811418914.4A CN201811418914A CN109541348B CN 109541348 B CN109541348 B CN 109541348B CN 201811418914 A CN201811418914 A CN 201811418914A CN 109541348 B CN109541348 B CN 109541348B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000002159 abnormal effect Effects 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 230000006872 improvement Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012850 discrimination method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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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Abstract
The invention relates to a converter valve submodule controller and a driving fault judging method. When the received drive feedback signal is abnormal, the drive feedback signal is re-received again after a period of time, if the re-received drive feedback signal is still abnormal, the sub-module is determined to have a drive fault, the condition that the sub-module is mistakenly reported when the sub-module is confirmed to have the drive fault only by receiving the drive feedback signal once is avoided, the risk of system shutdown is reduced, and the operation reliability of the flexible direct current transmission converter valve is improved.
Description
Technical Field
The invention belongs to the technical field of flexible direct current transmission, and particularly relates to a converter valve submodule controller and a driving fault judging method.
Background
Modular multilevel flexible direct current transmission (MMC-HVDC) is a new generation of direct current transmission technology. Moreover, the flexible dc transmission is a dc transmission based on a voltage source, and the voltage polarity of the dc line is not changed, so that it is very easy to construct a multi-terminal dc transmission, and thus it is possible to directly supply power to a small isolated load in a long distance, especially a passive system.
The converter valve is a core device of a flexible direct current transmission system and consists of thousands of sub-modules. The number of sub-modules is extremely large, and the number of fault points is large. In actual engineering operation, the sub-module IGBT driving fault is a fault phenomenon that the converter valve has the largest occurrence frequency.
The conventional drive failure judgment method comprises the following steps: and the sub-module controller judges the driving feedback signal in real time, and judges that a driving fault is generated when a driving feedback abnormal signal occurs. However, since the driving device itself is easily interfered in a high-voltage strong magnetic environment, the IGBT driving fault is easily detected by mistake, and if the driving feedback signal is transmitted to the sub-module controller, the sub-module controller generates a driving fault false alarm condition.
Disclosure of Invention
The invention aims to provide a converter valve submodule controller and a driving fault judging method, which are used for solving the problem that a driving device is easy to falsely detect IGBT driving faults under a high-pressure strong magnetic environment, so that the submodule controller generates driving fault misinformation.
In order to solve the technical problems, the technical scheme of the invention is as follows:
according to the method for judging the driving fault of the converter valve submodule, when the received driving feedback signal is abnormal, the driving feedback signal is received again within the set time, and if the driving feedback signal received again is abnormal, the submodule is determined to have the driving fault.
The invention relates to a converter valve submodule controller, which is used for executing instructions to realize the following method: and when the received driving feedback signal is abnormal, re-receiving the driving feedback signal within the set time, and if the re-received driving feedback signal is abnormal, determining that the sub-module has a driving fault.
The invention has the beneficial effects that:
when the received drive feedback signal is abnormal, the drive feedback signal is re-received again after a period of time, if the re-received drive feedback signal is still abnormal, the sub-module is determined to have a drive fault, the condition that the sub-module is mistakenly reported when the sub-module is confirmed to have the drive fault only by receiving the drive feedback signal once is avoided, the risk of system shutdown is reduced, and the operation reliability of the flexible direct current transmission converter valve is improved.
As a further improvement of the submodule controller and the driving fault judging method, when the received driving feedback signal is abnormal, the switching tube in the submodule is also controlled to be locked. And the switching tube in the control submodule is locked, so that the fault expansion is avoided.
As a further improvement of the sub-module controller and the driving fault judgment method, within the set time, when the voltage variation of the sub-module capacitor is greater than the set voltage threshold, the driving feedback signal is directly received again; and the sub-module capacitance voltage variation is the difference value between the sub-module capacitance voltage at the current moment and the sub-module capacitance voltage at the set time starting moment. When the capacitance voltage of the submodule is judged to be larger than the set voltage change threshold value, the charge-discharge state of the submodule is probably changed, and the drive feedback signal is directly received again and judged again, so that the fault judgment efficiency is improved.
As a further improvement of the submodule controller and the driving fault judging method, within the set time, if the variation of the capacitance voltage of the submodule is always smaller than or equal to the set voltage threshold, the submodule controller receives the driving feedback signal when the set time is reached. When the sub-module capacitor voltage is judged to be larger than the set voltage change threshold, the charge-discharge state of the sub-module is probably not changed, and at the moment, the sub-module needs to wait for the set time and then receives the driving feedback signal again so as to avoid misinformation.
When the sub-module is determined to have a drive fault, the sub-module is bypassed, and the drive fault information is reported to the valve control system. When the sub-module is determined to have a driving fault, the sub-module is bypassed to prevent the fault from diffusing, and the running reliability of the flexible direct-current transmission converter valve is improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Converter valve submodule driving fault discrimination method embodiment 1
The method of this embodiment performs comprehensive judgment based on the driving feedback signal and the sub-module capacitor voltage, and is a driving fault judgment optimization judgment method, where a flowchart is shown in fig. 1, and the steps are as follows:
1. the sub-module controller receives the driving feedback signal and judges whether the driving feedback signal is abnormal: if the driving feedback signal is abnormal, setting the driving fault prejudgment signal to be effective; and if the driving feedback signal is normal, re-executing the step 1.
2. After the driving fault prejudgment signal is effective, the sub-module controller sends an IGBT locking instruction to avoid fault expansion; meanwhile, the submodule controller records the submodule capacitor voltage V0 at the current moment.
3. And the sub-module controller starts timing, and the timing duration is set time T.
4. Within the duration of the set time T, judging whether the variation of the sub-module capacitor voltage is greater than a set voltage threshold: i Vx-V0 | > Vmax, wherein Vx represents the capacitance voltage of the submodule at a certain time in the T duration, and Vmax represents the set voltage threshold. If the variation of the sub-module capacitor voltage is larger than the set voltage threshold, the IGBT is reliably locked, the IGBT can be controlled again without waiting for the set time T, at the moment, the step 5 is directly executed, and otherwise, the step 6 is executed.
5. And re-receiving the driving feedback signal, and judging again: if the drive feedback signal received again is abnormal again, the sub-module controller sets the drive fault signal to be effective, bypasses the sub-module and reports the drive fault signal to the valve control system; and if the re-received drive feedback signal is normal, clearing the drive fault pre-judgment signal and re-executing the step 1.
6. And if the voltage variation of the sub-module capacitor is less than or equal to the set voltage threshold, executing the step 5 after the set time T is up.
It should be noted that the set voltage threshold Vmax and the set time T may be issued to the sub-module controller through the valve control system, or may be preset by the sub-module controller.
Converter valve submodule driving fault discrimination method embodiment 2
Different from the embodiment 1, in the embodiment, the driving fault of the converter valve submodule is not judged by combining the submodule capacitor voltage, and the steps are as follows:
1. the sub-module controller receives the driving feedback signal and judges whether the driving feedback signal is abnormal: if the driving feedback signal is abnormal, setting the driving fault prejudgment signal to be effective; and if the driving feedback signal is normal, re-executing the step 1.
2. After the driving fault prejudgment signal is effective, the sub-module controller sends an IGBT locking instruction to avoid fault expansion; meanwhile, the submodule controller records the submodule capacitor voltage V0 at the current moment.
3. And the sub-module controller starts timing, and the timing duration is set time T.
4. And when the set time T is up, re-receiving the driving feedback signal, and judging again: if the drive feedback signal received again is abnormal again, the sub-module controller sets the drive fault signal to be effective, bypasses the sub-module and reports the drive fault signal to the valve control system; and if the re-received drive feedback signal is normal, clearing the drive fault pre-judgment signal and re-executing the step 1.
Converter valve submodule controller embodiment
The embodiment provides a converter valve submodule controller, which is used for executing instructions to realize the converter valve submodule driving fault judging method. For the introduction of the method, see embodiments 1 and 2 of the converter valve submodule driving fault judging method, which are not described herein again.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (2)
1. A converter valve submodule driving fault distinguishing method is characterized in that when a received driving feedback signal is abnormal, a submodule controller sends a locking instruction to a switch tube in a submodule, and meanwhile, the submodule controller records submodule capacitor voltage at the current moment;
within a set time, when the voltage variation of the sub-module capacitor is larger than a set voltage threshold, directly receiving a driving feedback signal again; the submodule capacitor voltage variation is the difference value between the submodule capacitor voltage at the current moment and the submodule capacitor voltage at the set time starting moment;
within the set time, if the voltage variation of the sub-module capacitor is always smaller than or equal to the set voltage threshold, the sub-module capacitor receives the driving feedback signal again when the set time is reached; if the drive feedback signal received again is abnormal, determining that the sub-module has a drive fault; and when the sub-module is determined to have the drive fault, bypassing the sub-module and reporting the drive fault information to the valve control system.
2. A converter valve submodule controller, characterised in that the controller is arranged to execute instructions to implement the method of: when the received drive feedback signal is abnormal, the sub-module controller sends a locking instruction to a switch tube in the module, and simultaneously, the sub-module controller records the sub-module capacitor voltage at the current moment; in that
Within the set time, when the voltage variation of the sub-module capacitor is less than or equal to the set voltage threshold, re-receiving the driving feedback signal; the submodule capacitor voltage variation is the difference value between the submodule capacitor voltage at the current moment and the submodule capacitor voltage at the set time starting moment;
within the set time, if the voltage variation of the sub-module capacitor is always smaller than or equal to the set voltage threshold, the sub-module capacitor receives the driving feedback signal again when the set time is reached;
if the drive feedback signal received again is abnormal, determining that the sub-module has a drive fault; and when the sub-module is determined to have the drive fault, bypassing the sub-module and reporting the drive fault information to the valve control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811418914.4A CN109541348B (en) | 2018-11-26 | 2018-11-26 | Converter valve submodule controller and driving fault judging method |
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| CN109541348B true CN109541348B (en) | 2021-09-03 |
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| CN110747309A (en) * | 2019-09-27 | 2020-02-04 | 首钢京唐钢铁联合有限责任公司 | Control method and device for steelmaking converter steam drum water replenishing electric valve |
| CN111103486B (en) * | 2019-12-23 | 2022-05-20 | 国家电网有限公司 | Flexible direct current converter valve submodule type identification method and valve base controller |
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| CN106026157B (en) * | 2016-06-13 | 2018-08-07 | 许继集团有限公司 | Flexible direct current transmission converter valve sub-module fault prediction technique and device |
| CN106505512B (en) * | 2016-12-07 | 2019-01-08 | 北京四方继保自动化股份有限公司 | Number is unlocked after soft straight control system temporary blocking again to overflow trip method |
| CN108279378B (en) * | 2017-12-29 | 2022-03-18 | 中电普瑞电力工程有限公司 | Steady-state test device and method for modular multi-level converter valve |
| CN108321832A (en) * | 2018-02-07 | 2018-07-24 | 南方电网科学研究院有限责任公司 | Control method and control device for reducing equipment overcurrent operation risk |
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