CN116154716B - Active intervention method and device for quickly converting arc grounding into metal grounding - Google Patents
Active intervention method and device for quickly converting arc grounding into metal grounding Download PDFInfo
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- CN116154716B CN116154716B CN202211729258.6A CN202211729258A CN116154716B CN 116154716 B CN116154716 B CN 116154716B CN 202211729258 A CN202211729258 A CN 202211729258A CN 116154716 B CN116154716 B CN 116154716B
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- overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/167—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass combined with other earth-fault protective arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an active intervention method and equipment for quickly converting arc grounding into metal grounding, and belongs to the technical field of relay protection of power distribution networks. Firstly, constructing a fault phase accurate identification criterion based on a phase voltage magnitude relation, actively switching the fault phase into metal ground in one cycle, and carrying out full-spectrum high-adaptability arc extinction; secondly, utilizing the increased fault characteristic current after the metal transfer is grounded to realize accurate identification of a fault line; the integrated arc suppression device is characterized in that during the non-grounding period of the all-grounding device, the detected PT voltage is larger than a threshold value, the operation is automatic, the ferromagnetic resonance overvoltage associated with the arc overvoltage generation and treatment process is actively suppressed, the reliable active intervention of the distribution network arc light and the ferromagnetic noninverting overvoltage under various working conditions is realized, and the novel high-precision and high-integration active arc suppression and resonance elimination intervention method and equipment integrating arc suppression, resonance elimination and fault line selection functions are provided.
Description
Technical Field
The invention relates to the technical field of relay protection of power distribution networks, in particular to an active intervention method and device for quickly converting arc grounding into metal grounding.
Background
The frequently-occurring overvoltage of the distribution network such as arc grounding, ferromagnetic resonance and the like is one of the main reasons for causing serious accidents such as power failure, explosion, switch cabinet fire, cable breakdown and the like of transformer substations in a power system area. The traditional solution thinking is to install arc suppression coil (arc suppression cabinet) additional, and main drawback prominently shows as 2 aspects: (1) Therefore, the hidden line identification accuracy is low, and the practice proves that the hidden line identification accuracy is lower than 60%; (2) The adaptability is poor, the device parameters are set off-line, and the rapid change of the system capacity and the operation mode is difficult to adapt.
Aiming at the problems of ground short circuit fault and overvoltage of a distribution network, the treatment thought still stays on passive treatment and post-treatment, lacks an active intervention and quick inhibition method and technology, has more researches on overvoltage theory of the distribution network at home and abroad at present, comprises lightning overvoltage, operation overvoltage, arc overvoltage and resonance overvoltage, has more and miscellaneous treatment measures, such as adding a lightning arrester, an arc suppression coil, a pressure-sensitive primary harmonic eliminator and the like, has single and dispersed treatment measures, and is passive treatment and post-treatment; in order to solve the problems, the invention provides an active intervention method and device for quickly converting arc grounding into metal grounding.
Disclosure of Invention
The invention aims to provide an active intervention method and equipment for quickly converting arc grounding into metal grounding so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an active intervention method for quickly converting arc grounding into metal grounding is characterized by comprising the following steps:
s1, monitoring and collecting three-phase voltage and zero sequence voltage values at a neutral point of a bus, and judging whether a single-phase grounding fault occurs in the power distribution network;
s2, if the voltage value obtained in the S1 exceeds a threshold value, automatically starting an overvoltage active intervention system in the power distribution network, and entering the S3;
s3, the overvoltage active intervention system determines an overvoltage fault line based on a fuzzy theory multiple data line selection method;
s4, after the fault line is determined, the overvoltage active intervention system automatically controls the flow-sensitive intelligent harmonic elimination device between the neutral point of the fault line and the ground to play a role, automatically controls the grounding soft switch to be closed, and converts arc grounding at the fault into metal grounding;
s5, after a certain time, the grounding soft switch in S4 is disconnected, and whether the voltage value at the neutral point is normal or not after the disconnection is monitored: if the voltage value is still abnormal, indicating that the fault line is a permanent fault, and switching on the grounding soft switch at the fault position again; and if the voltage value is recovered to be normal, the single-phase grounding fault is eliminated, and the active intervention work is ended.
Preferably, the S3 specifically includes the following:
s3.1, acquiring zero sequence current of the first section of each outgoing line of the bus, and further determining whether a single-phase grounding fault occurs in the power distribution network by combining the voltage value measured in the S1; if the fault is determined to occur, S3.2, S3.3 and S3.4 are respectively and simultaneously entered;
s3.2, when the fault phase angle is large, focusing on using a line selection method based on high-frequency modal energy;
s3.3, when the fault phase angle is smaller, a line selection method based on an attenuation direct current component is focused on use;
s3.4, based on a 5 th harmonic component method, realizing line selection by using a correlation theory;
and S3.5, combining the membership of the fault measure and the membership of the method weight coefficient, and intelligently fusing the three line selection methods in the S3.2-S3.4 by using a fuzzy theory to realize multi-criterion fused fault line selection.
Preferably, the flow-sensitive intelligent resonance elimination device mentioned in S4 is preferably a split-phase control type fast vacuum circuit breaker of electromagnetic repulsion technology; under the normal operation condition of the flow-sensitive intelligent resonance elimination device, the flow-sensitive resonance elimination device is in a low-resistance state, and system parameters are not influenced; when the system generates the Nox vibration, the flow-sensitive Huainou device is suddenly changed into a high-resistance state, the resonance energy is consumed, the resonance parameters are changed, and the PT exciting current is restrained below 200 mA.
An active intervention device for quickly converting arc grounding into metal grounding comprises a flow-sensitive intelligent resonance elimination device, a grounding soft switch, a main controller and a transient voltage monitoring device, wherein the device is connected in series between a neutral point of a bus PT and the ground;
the flow-sensitive intelligent resonance elimination device is used as a metal grounding loop for treating intermittent arc grounding overvoltage of a neutral point ungrounded system;
the grounding soft switch is used for controlling the on-off of the metal grounding loop;
the main controller is used for receiving bus voltage signals and controlling the flow-sensitive intelligent resonance elimination device and the grounding soft switch;
the transient voltage monitoring equipment is used for monitoring real-time transient voltages of the intelligent harmonic elimination device and the grounding soft switch.
Compared with the prior art, the invention provides an active intervention method and equipment for quickly converting arc grounding into metal grounding, which have the following beneficial effects:
(1) Aiming at the problems of overlarge detuning degree of arc suppression coil investment and passive regulation when a distribution network single-phase grounding fault occurs, the invention provides an active intervention strategy for rapidly converting arc grounding into metal grounding in a first cycle of arc grounding;
(2) The invention intelligently fuses the high-frequency modal energy fault line selection method, the 5 th harmonic component fault line selection method and the attenuation direct current component fault line selection method, thereby realizing multi-criterion fusion fault line selection based on a fuzzy theory;
(3) The overvoltage active intervention method and the device integrating arc extinction, resonance elimination and fault line selection functions into a whole are provided, the overvoltage active intervention method and the device are in line with the design requirements of the existing typical transformer substation, and the method and the device are suitable for the operation scene of the full-voltage distribution network of 35 kilovolts and below.
In summary, the invention provides a power distribution network overvoltage active intervention solution with integrated fault phase rapid active metal grounding, arc extinction and resonance elimination aiming at the technical problem of high reliability and high adaptability in power distribution network overvoltage management.
Drawings
FIG. 1 is a schematic flow chart of an active intervention method for rapidly converting arc grounding to metal grounding according to the present invention;
FIG. 2 is a schematic flow chart of a multiple data line selection method based on fuzzy theory;
fig. 3 is a schematic structural diagram of an active intervention device for rapidly converting arc grounding to metal grounding according to the present invention.
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.
Referring to fig. 1-3, an active intervention method for rapidly converting arc grounding into metal grounding specifically includes the following steps:
s1, monitoring and collecting three-phase voltage and zero sequence voltage values at a neutral point of a bus, and judging whether a single-phase grounding fault occurs in the power distribution network;
s2, if the voltage value obtained in the S1 exceeds a threshold value, automatically starting an overvoltage active intervention system in the power distribution network, and entering the S3;
s3, the overvoltage active intervention system determines an overvoltage fault line based on a fuzzy theory multiple data line selection method;
the method specifically comprises the following steps:
s3.1, acquiring zero sequence current of the first section of each outgoing line of the bus, and further determining whether a single-phase grounding fault occurs in the power distribution network by combining the voltage value measured in the S1; if the fault is determined to occur, S3.2, S3.3 and S3.4 are respectively and simultaneously entered;
s3.2, when the fault phase angle is large, focusing on using a line selection method based on high-frequency modal energy;
s3.3, when the fault phase angle is smaller, a line selection method based on an attenuation direct current component is focused on use;
s3.4, based on a 5 th harmonic component method, realizing line selection by using a correlation theory;
s3.5, combining the membership degree of the fault measure and the membership degree of the method weight coefficient, and intelligently fusing three line selection methods in S3.2-S3.4 by using a fuzzy theory to realize multi-criterion fused fault line selection;
s4, after the fault line is determined, the overvoltage active intervention system automatically controls the flow-sensitive intelligent harmonic elimination device between the neutral point of the fault line and the ground to play a role, automatically controls the grounding soft switch to be closed, and converts arc grounding at the fault into metal grounding; the intelligent harmonic elimination device is preferably a split-phase control type quick vacuum circuit breaker adopting electromagnetic repulsion technology; under the normal operation condition of the flow-sensitive intelligent resonance elimination device, the flow-sensitive resonance elimination device is in a low-resistance state, and system parameters are not influenced; when the system generates the Nox vibration, the flow-sensitive Huainou device is suddenly changed into a high-resistance state, the resonance energy is consumed, the resonance parameters are changed, and the PT exciting current is restrained below 200 mA;
s5, after a certain time, the grounding soft switch in S4 is disconnected, and whether the voltage value at the neutral point is normal or not after the disconnection is monitored: if the voltage value is still abnormal, indicating that the fault line is a permanent fault, and switching on the grounding soft switch at the fault position again; and if the voltage value is recovered to be normal, the single-phase grounding fault is eliminated, and the active intervention work is ended.
Meanwhile, an active intervention device matched with the active intervention method is provided, the device comprises a flow-sensitive intelligent resonance elimination device, a grounding soft switch, a main controller and a transient voltage monitoring device, and the device is connected in series between a neutral point of a bus PT and the ground;
the flow-sensitive intelligent resonance elimination device is used as a metal grounding loop for treating intermittent arc grounding overvoltage of a neutral point ungrounded system;
the grounding soft switch is used for controlling the on-off of the metal grounding loop;
the main controller is used for receiving bus voltage signals and controlling the flow-sensitive intelligent resonance elimination device and the grounding soft switch;
the transient voltage monitoring equipment is used for monitoring real-time transient voltages of the intelligent harmonic elimination device and the grounding soft switch.
Based on the above, the invention provides an active intervention strategy for rapidly converting arc grounding into metal grounding in the first cycle of arc grounding aiming at the problems of overlarge detuning degree and passive adjustment of arc suppression coil investment when a single-phase grounding fault of a distribution network occurs; meanwhile, the invention intelligently fuses the high-frequency modal energy fault line selection method, the 5 th harmonic component fault line selection method and the attenuation direct current component fault line selection method, thereby realizing multi-criterion fusion fault line selection based on a fuzzy theory; furthermore, the overvoltage active intervention method and equipment integrating arc extinction, harmonic elimination and fault line selection functions into a whole and having high precision and high integration level are provided, the design requirements of the existing typical transformer substation are met, and the method and equipment are suitable for full-voltage distribution network operation scenes of 35 kilovolts and below.
In summary, the invention provides a power distribution network overvoltage active intervention solution with integrated fault phase rapid active metal grounding, arc extinction and resonance elimination aiming at the technical problem of high reliability and high adaptability in power distribution network overvoltage management.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. An active intervention method for quickly converting arc grounding into metal grounding is characterized by comprising the following steps:
s1, monitoring and collecting three-phase voltage and zero sequence voltage values at a neutral point of a bus, and judging whether a single-phase grounding fault occurs in the power distribution network;
s2, if the voltage value obtained in the S1 exceeds a threshold value, automatically starting an overvoltage active intervention system in the power distribution network, and entering the S3;
s3, the overvoltage active intervention system determines an overvoltage fault line based on a fuzzy theory multiple data line selection method;
the method specifically comprises the following steps:
s3.1, acquiring zero sequence current of the first section of each outgoing line of the bus, and further determining whether a single-phase grounding fault occurs in the power distribution network by combining the voltage value measured in the S1; if the fault is determined to occur, S3.2, S3.3 and S3.4 are respectively and simultaneously entered;
s3.2, when the fault phase angle is large, focusing on using a line selection method based on high-frequency modal energy;
s3.3, when the fault phase angle is smaller, a line selection method based on an attenuation direct current component is focused on use;
s3.4, based on a 5 th harmonic component method, realizing line selection by using a correlation theory;
s3.5, combining the membership degree of the fault measure and the membership degree of the method weight coefficient, and intelligently fusing three line selection methods in S3.2-S3.4 by using a fuzzy theory to realize multi-criterion fused fault line selection;
s4, after the fault line is determined, the overvoltage active intervention system automatically controls the flow-sensitive intelligent harmonic elimination device between the neutral point of the fault line and the ground to play a role, automatically controls the grounding soft switch to be closed, and converts arc grounding at the fault into metal grounding;
s5, after a certain time, the grounding soft switch in S4 is disconnected, and whether the voltage value at the neutral point is normal or not after the disconnection is monitored: if the voltage value is still abnormal, indicating that the fault line is a permanent fault, and switching on the grounding soft switch at the fault position again; and if the voltage value is recovered to be normal, the single-phase grounding fault is eliminated, and the active intervention work is ended.
2. The method and equipment for actively intervening in the rapid transition from arc grounding to metal grounding according to claim 1, wherein the intelligent harmonic elimination device with flow sensitivity mentioned in the step S4 is a split-phase control type rapid vacuum circuit breaker with electromagnetic repulsion technology; under the normal operation condition of the flow-sensitive intelligent resonance elimination device, the flow-sensitive resonance elimination device is in a low-resistance state, and system parameters are not influenced; when the system generates the Nox vibration, the flow-sensitive Huainou device is suddenly changed into a high-resistance state, the resonance energy is consumed, the resonance parameters are changed, and the PT exciting current is restrained below 200 mA.
3. An active intervention device matched with an active intervention method for quickly converting arc grounding into metal grounding according to any one of claims 1-2, wherein the device comprises a flow-sensitive intelligent resonance elimination device, a grounding soft switch, a main controller and a transient voltage monitoring device, and the device is connected in series between a neutral point of a bus PT and the ground;
the flow-sensitive intelligent resonance elimination device is used as a metal grounding loop for treating intermittent arc grounding overvoltage of a neutral point ungrounded system;
the grounding soft switch is used for controlling the on-off of the metal grounding loop;
the main controller is used for receiving bus voltage signals and controlling the flow-sensitive intelligent resonance elimination device and the grounding soft switch;
the transient voltage monitoring equipment is used for monitoring real-time transient voltages of the intelligent harmonic elimination device and the grounding soft switch.
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| CN202211729258.6A CN116154716B (en) | 2022-12-30 | 2022-12-30 | Active intervention method and device for quickly converting arc grounding into metal grounding |
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| CN202211729258.6A CN116154716B (en) | 2022-12-30 | 2022-12-30 | Active intervention method and device for quickly converting arc grounding into metal grounding |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817170Y (en) * | 2005-08-19 | 2006-09-13 | 安徽赛普电气有限公司 | Arc-resonance extinction route-selecting over voltage protection device |
| CN201008096Y (en) * | 2006-12-22 | 2008-01-16 | 丁张帅 | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network |
| CN101707369A (en) * | 2009-03-17 | 2010-05-12 | 郭道胜 | Arc and resonance elimination comprehensive device for power grid |
| CN215071637U (en) * | 2021-04-26 | 2021-12-07 | 合肥凯高电气设备有限公司 | Novel neutral point comprehensive grounding management and arc light treatment route selection device |
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- 2022-12-30 CN CN202211729258.6A patent/CN116154716B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2817170Y (en) * | 2005-08-19 | 2006-09-13 | 安徽赛普电气有限公司 | Arc-resonance extinction route-selecting over voltage protection device |
| CN201008096Y (en) * | 2006-12-22 | 2008-01-16 | 丁张帅 | Arc extinguishing compensation mechanism for neutral point non-effective earthing power network |
| CN101707369A (en) * | 2009-03-17 | 2010-05-12 | 郭道胜 | Arc and resonance elimination comprehensive device for power grid |
| CN215071637U (en) * | 2021-04-26 | 2021-12-07 | 合肥凯高电气设备有限公司 | Novel neutral point comprehensive grounding management and arc light treatment route selection device |
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