CN112018897B - Method and device for monitoring state of superconducting alternating current limiter based on reclosing - Google Patents
Method and device for monitoring state of superconducting alternating current limiter based on reclosing Download PDFInfo
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- CN112018897B CN112018897B CN202010947032.8A CN202010947032A CN112018897B CN 112018897 B CN112018897 B CN 112018897B CN 202010947032 A CN202010947032 A CN 202010947032A CN 112018897 B CN112018897 B CN 112018897B
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
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- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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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
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention provides a method and a device for monitoring the state of a superconducting alternating current limiter based on reclosing. The method comprises the steps of obtaining the initial coil temperature of the superconducting alternating current limiter when the alternating current system normally operates, and determining whether a coil of the superconducting alternating current limiter is in a quench state or not according to the initial coil temperature; when the coil is not in a quench state and a first short-circuit fault occurs in an alternating current system, acquiring the temperature of a first short-circuit coil; determining whether the first resistance and/or the first short circuit coil temperature exceeds a preset value; if the temperature of the coil of the current limiter is not higher than the preset value and the temperature of the coil of the current limiter is higher than the temperature of liquid nitrogen before the system reclosing, the final coil temperature is obtained when the short-circuit current disappears after the system reclosing; and when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state. The method can effectively monitor the whole state of the superconducting alternating current limiter.
Description
Technical Field
The invention relates to the technical field of superconducting Alternating Current (AC) prior devices, in particular to a method and a device for monitoring the state of a superconducting AC current limiter based on reclosing, computer equipment and a computer readable storage medium.
Background
The current limiter is a common device for solving the problem of overlarge current in the fault short circuit in the operation of a power grid. However, it is not easy to design a suitable superconducting current limiter, and some factors of the grid system need to be comprehensively considered. At present, factors such as reclosing and the like are often ignored in the design of a commonly used current limiter, and the thermal stability of the designed current limiter is possibly poor; therefore, it is important to monitor the state of the superconducting current limiter; but currently there is a lack of relevant monitoring solutions.
Disclosure of Invention
In view of the above, the present invention provides a monitoring method, an apparatus, a computer device and a computer readable storage medium for monitoring a state of a superconducting ac current limiter based on reclosing, so as to overcome the problem that the prior art lacks a related monitoring scheme for the superconducting current limiter.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the invention provides a monitoring method of a state of a superconducting alternating current limiter based on reclosing, wherein the superconducting alternating current limiter is arranged in an alternating current system and comprises the following steps:
when the alternating current system normally operates, acquiring the initial coil temperature of the superconducting alternating current limiter, and determining whether a coil of the superconducting alternating current limiter is in a quench state or not according to the initial coil temperature;
when the coil is not in a quench state and a first short circuit fault occurs in the alternating current system, acquiring a first short circuit coil temperature of the superconducting alternating current limiter, determining a first resistance of the superconducting alternating current limiter according to the first short circuit coil temperature, and judging whether the first resistance exceeds a preset resistance and whether the first short circuit coil temperature of the superconducting alternating current limiter exceeds a preset temperature;
when the first resistor does not exceed a preset resistor and/or the temperature of the first short-circuit coil does not exceed a preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the temperature of liquid nitrogen before the alternating current system is reclosed, judging whether the short-circuit current disappears or not after the alternating current system is reclosed;
when the short circuit current disappears, acquiring the final coil temperature of the superconducting alternating current limiter;
and when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state.
Further, still include: when the final coil temperature is in a rising trend, switching on a bypass switch of the superconducting alternating current limiter;
and when the final coil temperature is reduced, judging that the superconducting alternating current limiter is in a normal superconducting state, and disconnecting the bypass switch.
Further, still include:
when the short-circuit current does not disappear and a second short-circuit fault is sent by the alternating current system, acquiring the temperature of a second short-circuit coil of the superconducting alternating current limiter, determining a second resistance of the superconducting alternating current limiter according to the temperature of the second short-circuit coil, judging whether the second resistance exceeds a preset resistance or not, and judging whether the temperature of the second short-circuit coil of the superconducting alternating current limiter exceeds the preset temperature or not;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
Further, still include:
and when the second resistance exceeds a preset resistance and/or the temperature of the second short circuit coil exceeds a preset temperature, judging that the superconducting direct current limiter is in a fault state.
Further, still include:
and when the alternating current system normally operates and the coil is in a quench state, judging that the superconducting alternating current limiter is in a fault state.
Further, the air conditioner is provided with a fan,
in the step of determining a first resistance of the superconducting alternating current limiter based on the first short circuit coil temperature, the method includes:
the first resistance is determined from a temperature versus resistance curve.
Further, still include:
before the alternating current system is reclosed, the coil temperature of the superconducting alternating current limiter is equal to the liquid nitrogen temperature, when the alternating current system sends a second short-circuit fault if the short-circuit current does not disappear after the alternating current system is reclosed, the second short-circuit coil temperature of the superconducting alternating current limiter is obtained, a second resistance of the superconducting alternating current limiter is determined according to the second short-circuit coil temperature, whether the second resistance exceeds a preset resistance or not is judged, and whether the second short-circuit coil temperature of the superconducting alternating current limiter exceeds the preset temperature or not is judged;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
The embodiment of the invention provides a monitoring device for the state of a superconducting alternating current limiter based on reclosing, which comprises:
the first parameter acquisition module is used for acquiring the initial coil temperature of the superconducting alternating current limiter when the alternating current system normally operates;
the state determining module is used for determining whether a coil of the superconducting alternating current limiter is in a quench state according to the initial coil temperature;
the second parameter acquisition module is used for acquiring the temperature of a first short-circuit coil of the superconducting alternating current limiter when the coil is not in a quench state and a first short-circuit fault occurs in the alternating current system;
a first resistance calculation module for determining a first resistance of the superconducting alternating current limiter according to the first short circuit coil temperature;
the first judging module is used for judging whether the first resistance exceeds a preset resistance or not and whether the temperature of a first short circuit coil of the superconducting alternating current limiter exceeds a preset temperature or not;
the second judging module is used for judging whether the short-circuit current disappears or not after the alternating current system is reclosed when the first resistor does not exceed the preset resistor and/or the first short-circuit coil temperature does not exceed the preset temperature and the coil temperature of the superconducting alternating current limiter before the alternating current system is reclosed is higher than the liquid nitrogen temperature;
the third parameter acquisition module is used for acquiring the final coil temperature of the superconducting alternating current limiter when the short-circuit current disappears;
and the judging module is used for judging that the superconducting alternating current limiter is in a normal superconducting state when the final coil temperature is in a descending trend.
The embodiment of the invention provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor is used for realizing the monitoring method of the state of the superconducting alternating current limiter based on reclosing when executing the program.
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the monitoring method for the status of a reclosing-based superconducting ac current limiter.
According to the monitoring method, the monitoring device, the monitoring computer equipment and the monitoring computer readable storage medium of the state of the reclosing-based superconducting alternating current limiter, firstly, when an alternating current system normally operates, the temperature of an initial coil of the superconducting alternating current limiter is obtained, and whether the coil of the superconducting alternating current limiter is in a quench state or not is determined according to the temperature of the initial coil; when the coil is not in a quench state and a first short circuit fault occurs in the alternating current system, acquiring the temperature of a first short circuit coil of the superconducting alternating current limiter, determining a first resistance of the superconducting alternating current limiter according to the temperature of the first short circuit coil, judging whether the first resistance exceeds a preset resistance, and judging whether the temperature of the first short circuit coil of the superconducting alternating current limiter exceeds the preset temperature; when the first resistor does not exceed the preset resistor and/or the temperature of the first short-circuit coil does not exceed the preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the temperature of liquid nitrogen before the alternating current system is reclosed, judging whether the short-circuit current disappears or not after the alternating current system is reclosed; when the short circuit current disappears, the final coil temperature of the superconducting alternating current limiter is obtained; and when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state. According to the monitoring method of the state of the superconducting alternating current limiter based on reclosing, in the process of short-circuit fault and reclosing of an alternating current system, the state of the superconducting alternating current limiter is accurately judged by detecting the temperature of a voltage coil of the superconducting alternating current limiter, whether the current limiter is normal is judged, and a corresponding processing scheme is provided when the current limiter is abnormal. The method can effectively monitor the whole state of the superconducting alternating current limiter and avoid the influence on an alternating current system caused by the fault of the superconducting alternating current limiter.
Drawings
In order to more clearly illustrate the technical solutions in the prior art of the embodiments of the present invention, the drawings used in the description of the prior art of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a monitoring method for a state of a reclosing-based superconducting alternating current limiter according to an embodiment of the invention;
fig. 2 is a schematic flow chart of a monitoring method for the state of a reclosing-based superconducting alternating current limiter according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a monitoring device for monitoring the state of a reclosing-based superconducting alternating current limiter according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a computer device in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In order to explain the present invention in more detail, the following describes a method, an apparatus, a computer device and a computer readable storage medium for monitoring the state of a reclosing-based superconducting ac current limiter according to the present invention in detail with reference to the accompanying drawings.
The method can be applied to terminals, and the terminals can be personal computers, notebook computers and the like.
In an embodiment, as shown in fig. 1, a method for monitoring a state of a reclosing-based superconducting ac current limiter is provided, where the superconducting ac current limiter is provided in an ac system, and the method is described as applied to a terminal, and includes the following steps:
102, when the alternating current system normally operates, acquiring the initial coil temperature of the superconducting alternating current limiter, and determining whether a coil of the superconducting alternating current limiter is in a quench state or not according to the initial coil temperature;
the initial coil temperature refers to the coil temperature of the superconducting alternating current limiter when the alternating current system is normal.
Under normal conditions, when the ac system is operating normally (i.e. the ac system is in a non-short-circuit and fault state), the superconducting ac current limiter is also in a normal operating state, and at this time, the resistance of the superconducting ac current limiter should be small and almost 0, where the voltage of the superconducting ac current limiter is relatively small and the coil temperature is also relatively low. When the superconducting alternating current limiter fails, a quench state is shown, and the temperature of a coil of the superconducting alternating current limiter changes. In this embodiment, when the ac normally operates, the initial coil temperature of the superconducting ac current limiter is obtained, and whether the coil of the superconducting ac current limiter is in a quench state is determined according to the initial coil temperature, so as to determine whether the superconducting ac current limiter fails. Specifically, if the coil is quenched and the external current is unchanged, it indicates that the current limiter is failed and needs to be processed. In normal operation, the superconducting tapes of the current limiter are in a superconducting state and do not exhibit electrical resistance. And through directly measuring the coil temperature, whether the coil quench can also be known, if the coil temperature rises, it is in an abnormal state that the coil generates heat.
104, when the coil is not in a quench state and a first short circuit fault occurs in the alternating current system, acquiring a first short circuit coil temperature of the superconducting alternating current limiter, determining a first resistance of the superconducting alternating current limiter according to the first short circuit coil temperature, and judging whether the first resistance exceeds a preset resistance and whether the first short circuit coil temperature of the superconducting alternating current limiter exceeds the preset temperature;
the first short-circuit coil temperature refers to the coil temperature of the superconducting alternating current limiter when the alternating current system has a first short-circuit fault.
When the coil is not in the quench state, it shows that the superconducting AC current limiter has no fault when the AC system is in normal operation. Then, when the AC system has a first fault, acquiring the temperature of a first short circuit coil of the superconducting AC current limiter; determining a first resistance of the superconducting alternating current limiter according to the temperature of the first short circuit coil; then, whether the first resistance exceeds a preset resistance and whether the temperature of the first short circuit coil of the superconducting alternating current limiter exceeds a preset temperature can be judged. The preset resistance generally refers to the maximum resistance of the superconducting alternating current limiter in a quench state, and the preset temperature refers to the maximum temperature which the superconducting alternating current limiter can bear in the quench state. In the present embodiment, whether or not the coil of the superconducting ac current limiter is in the safe range is confirmed based on the first resistance first short circuit coil temperature (i.e., any one of them).
Specifically, when a short-circuit fault occurs in the system, the alternating current short-circuit current generates impact, the alternating current limiter quenches, and at the moment, the circuit breaker is disconnected from the zero crossing point of the current. During the process from the occurrence of the short-circuit fault to the current cut-off, the resistance value of the current limiter can be known to be larger than the designed value or not by measuring the voltage at two ends of the current limiter. By measuring the temperature of the coil in the current limiter, whether the temperature of the coil exceeds a set value or not and is in a safe range or not can be known through the temperature.
Step 106, judging whether the short-circuit current disappears or not after the alternating current system is reclosed when the first resistor does not exceed the preset resistor and/or the first short-circuit coil temperature does not exceed the preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the liquid nitrogen temperature before the alternating current system is reclosed;
when the first resistance does not exceed the preset resistance and/or the first short circuit coil temperature does not exceed the preset temperature, the superconducting alternating current limiter is in a safe range. Then, system reclosing is carried out, and whether the short-circuit current disappears or not is judged after the system reclosing.
Specifically, the temperature of the coil of the superconducting alternating current limiter is reduced during the reclosing time of the system. And after reclosing, judging whether the short-circuit current disappears.
Step 108, acquiring the final coil temperature of the superconducting alternating current limiter when the short-circuit current disappears;
and step 110, when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state.
The final coil temperature refers to the coil temperature of the superconducting alternating current limiter after the alternating current system is reclosed.
Specifically, if the short-circuit current disappears and the ac system returns to normal, the temperature of the coil of the superconducting ac current limiter is monitored to see whether the temperature of the coil of the superconducting ac current limiter is in a decreasing trend, and if the temperature of the coil of the superconducting ac current limiter is in a decreasing trend and finally returns to normal, it indicates that the current limiter returns to a normal superconducting state.
The monitoring method of the state of the superconducting alternating current limiter based on reclosing in the embodiment of the invention comprises the steps of firstly, acquiring the initial coil temperature of the superconducting alternating current limiter when an alternating current system normally operates, and determining whether a coil of the superconducting alternating current limiter is in a quench state or not according to the initial coil temperature; when the coil is not in a quench state and a first short circuit fault occurs in the alternating current system, acquiring the temperature of a first short circuit coil of the superconducting alternating current limiter, determining a first resistance of the superconducting alternating current limiter according to the temperature of the first short circuit coil, judging whether the first resistance exceeds a preset resistance, and judging whether the temperature of the first short circuit coil of the superconducting alternating current limiter exceeds the preset temperature; when the first resistor does not exceed the preset resistor and/or the temperature of the first short-circuit coil does not exceed the preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the temperature of liquid nitrogen before the alternating current system is reclosed, judging whether the short-circuit current disappears or not after the alternating current system is reclosed; when the short circuit current disappears, the final coil temperature of the superconducting alternating current limiter is obtained; and when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state. According to the monitoring method of the state of the superconducting alternating current limiter based on reclosing, in the process of short-circuit fault and reclosing of an alternating current system, the state of the superconducting alternating current limiter is accurately judged by detecting the temperature of a voltage coil of the superconducting alternating current limiter, whether the current limiter is normal is judged, and a corresponding processing scheme is provided when the current limiter is abnormal. The method can effectively monitor the whole state of the superconducting alternating current limiter and avoid the influence on an alternating current system caused by the fault of the superconducting alternating current limiter.
In one embodiment, further comprising: when the temperature of the final coil is in a rising trend, closing a bypass switch of the superconducting alternating current limiter;
and when the temperature of the coil is reduced finally, judging that the superconducting alternating current limiter is in a normal superconducting state, and disconnecting the bypass switch.
Specifically, after the ac system is reclosed, if the short-circuit current has disappeared and the system returns to normal, the temperature of the voltage coil of the superconducting ac current limiter is monitored to see whether the temperature of the coil of the superconducting ac current limiter is in a decreasing trend. If the temperature of the coil of the superconducting alternating current limiter is in a rising trend, the temperature of the coil is higher and higher, the resistance is higher and higher, the process is an unrecoverable process, the coil is burnt out due to over-temperature, at the moment, a bypass switch of the superconducting alternating current limiter needs to be switched on emergently to enable current to flow away from a bypass, and after the temperature of the superconducting alternating current limiter is gradually restored, the current passes through the current limiter due to a resistance shunt effect, and the bypass switch is switched off again. By adopting the method, when the superconducting alternating current limiter is damaged, bypass shunting can be adopted, so that the damage of the superconducting alternating current limiter is avoided.
In one embodiment, further comprising:
when the short-circuit current does not disappear and a second short-circuit fault is sent by the alternating current system, acquiring the temperature of a second short-circuit coil of the superconducting alternating current limiter, determining a second resistance of the superconducting alternating current limiter according to the temperature of the second short-circuit coil, judging whether the second resistance exceeds a preset resistance or not, and judging whether the temperature of the second short-circuit coil of the superconducting alternating current limiter exceeds the preset temperature or not;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
The second short-circuit coil temperature refers to the coil temperature of the superconducting alternating current limiter when the alternating current system has a second short-circuit fault.
Specifically, after the alternating current system is reclosed, whether the short-circuit current disappears is judged. If the short-circuit current does not disappear and the short-circuit current impacts again, the temperature of the voltage coil of the superconducting alternating current limiter needs to be monitored to see whether the second resistance of the superconducting alternating current limiter exceeds the preset resistance and whether the temperature of the second short-circuit coil of the superconducting alternating current limiter exceeds the preset temperature, namely whether the superconducting alternating current limiter is in the safety range and whether a fault occurs is determined.
In one embodiment, the coil temperature of the superconducting alternating current limiter is equal to the liquid nitrogen temperature before the alternating current system is reclosed, when the alternating current system sends a second short-circuit fault if the short-circuit current does not disappear after the alternating current system is reclosed, the second short-circuit coil temperature of the superconducting alternating current limiter is obtained, a second resistance of the superconducting alternating current limiter is determined according to the second short-circuit coil temperature, whether the second resistance exceeds a preset resistance or not is judged, and whether the second short-circuit coil temperature of the superconducting alternating current limiter exceeds the preset temperature or not is judged;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
Specifically, the temperature of the coil of the superconducting alternating current limiter before the reclosing of the alternating current system is equal to the temperature of liquid nitrogen, which indicates that the temperature of the coil of the superconducting alternating current limiter is recovered to be normal at the moment. And after the alternating current system is reclosed, judging whether the short-circuit current disappears. If the short-circuit current does not disappear and the short-circuit current impacts again, the temperature of the voltage coil of the superconducting alternating current limiter needs to be monitored to see whether the second resistance of the superconducting alternating current limiter exceeds the preset resistance and whether the temperature of the second short-circuit coil of the superconducting alternating current limiter exceeds the preset temperature, namely whether the superconducting alternating current limiter is in the safety range and whether a fault occurs is determined.
In one embodiment, further comprising: and when the second resistance exceeds the preset resistance and/or the temperature of the second short circuit coil exceeds the preset temperature, judging that the superconducting direct current limiter is in a fault state. When the second resistance exceeds the preset resistance and/or when the temperature of the second short-circuit coil exceeds the preset temperature, the superconducting alternating current limiter is indicated that an overtemperature state occurs already when the second short-circuit impacts, and the second short-circuit coil is not in a safe range. At this time, since the coil of the superconducting ac current limiter is usually blown or the like, it is determined that the superconducting ac current limiter is in a failure state. The method can quickly determine whether the superconducting alternating current limiter is in a fault state.
In one embodiment, further comprising: when the alternating current system normally operates and the coil is in a quench state, the superconducting alternating current limiter is judged to be in a fault state.
Specifically, when the alternating current system normally operates, a coil of the superconducting alternating current limiter is not in a quench state under the normal condition; however, when the coil is in the quench state, the superconducting ac current limiter is in the fault state.
In one embodiment, the step of determining the first resistance of the superconducting ac current limiter based on the first shorted coil temperature includes: a first resistance is determined from a temperature versus resistance curve.
Specifically, when the first resistance of the superconducting alternating current limiter is determined according to the first short-circuit coil temperature, the first resistance can be calculated according to the first resistance; the first resistance can also be determined as a function of the first short-circuit coil temperature, wherein the first resistance is typically determined as a function of a temperature-resistance curve.
To facilitate understanding of the present solution, a detailed embodiment is given. As shown in fig. 2, a method for monitoring the state of a superconducting ac current limiter based on reclosing includes: 1. when the superconducting alternating current limiter normally operates (namely, when an alternating current system normally operates), the temperature Tc of the coil is directly measured to judge whether the coil is quenched or not. If the coil is quenched and the external current is unchanged, it indicates that the superconducting alternating current limiter is failed and needs to be processed. In normal operation, the superconducting tapes of the superconducting alternating current limiter are in a superconducting state and do not present resistance. And through directly measuring the coil temperature, whether the coil quench can also be known, if the coil temperature rises, it is in an abnormal state that the coil generates heat.
2. When the alternating current system has short-circuit fault, the alternating current short-circuit current generates impact, and the superconducting alternating current limiter quenches; the circuit breaker is now open at zero crossing of the current. In the process from short circuit fault to current cut-off, the temperature of coil in the superconducting AC current limiter is measured to know whether the temperature of coil exceeds the set value or not and whether the temperature is in the safe range or not. In addition, the resistance of the superconducting ac current limiter can also be determined by a temperature-resistance curve.
3. When the alternating current system is reclosed, the temperature in the reclosing time is reduced, and the corresponding Tc is also reduced. And judging whether the coil temperature of the superconducting alternating current limiter before reclosing is recovered to the liquid nitrogen temperature (a value corresponding to the normal current), if so, indicating that the superconducting alternating current limiter is recovered to be normal.
4. And if the superconducting alternating current limiter is restored to the normal state, judging whether the short-circuit current disappears or not after the alternating current system is reclosed. If the short circuit current disappears, the system reverts to the normal state. If the short-circuit current does not disappear and the short-circuit current impacts again, the Tc is monitored to see whether the superconducting coil is over-temperature or not.
5. If the superconducting alternating current limiter does not recover to a normal state, after the alternating current system is reclosed, if the short-circuit current does not disappear, the short-circuit current impacts again, and the Tc is monitored to see whether the superconducting coil is over-temperature or not.
6. If the short-circuit current disappears and the system returns to normal, the Tc is monitored to see whether the Tc is in a descending trend or not, and if the Tc is in a descending trend and finally returns to normal, the superconducting alternating current limiter returns to a normal superconducting state. If Tc is in the rising trend, the temperature of the coil is higher and higher, the resistance is higher and higher, the process is an unrecoverable process, and finally the coil is burnt out due to over-temperature, at the moment, a bypass switch of the superconducting alternating current limiter needs to be switched on emergently to enable current to flow away from a bypass, after the temperature of the superconducting alternating current limiter is gradually restored, the current passes through the superconducting alternating current limiter due to the resistance shunting effect, and the bypass switch is switched off again.
7. And finally, the superconducting alternating current limiter returns to normal. If the phenomenon that the superconducting alternating current limiter is over-heated (namely Tc exceeds a set value) occurs in the short circuit process of the system, the superconducting alternating current limiter needs to be checked and confirmed to see whether the superconducting alternating current limiter is damaged or not.
It should be understood that although the various steps in the flow charts of fig. 1-2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-2 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the sub-steps may not necessarily be performed in sequence, but may be performed alternately with at least some of the sub-steps of other steps.
The above embodiments of the present disclosure describe in detail a method for monitoring a state of a reclose-based superconducting ac current limiter, and the above method disclosed by the present disclosure may be implemented by various types of devices, so the present disclosure also discloses a device for monitoring a state of a reclose-based superconducting ac current limiter corresponding to the above method, and the following detailed description is given for specific embodiments.
Referring to fig. 3, a monitoring apparatus for monitoring a state of a superconducting ac current limiter based on reclosing according to an embodiment of the present invention mainly includes:
a first parameter obtaining module 302, configured to obtain an initial coil temperature of the superconducting ac current limiter when the ac system is operating normally;
a state determining module 304, configured to determine whether a coil of the superconducting ac current limiter is in a quench state according to the initial coil temperature;
a second parameter obtaining module 306, configured to obtain a first short-circuit coil temperature of the superconducting ac current limiter when the coil is not in a quench state and a first short-circuit fault occurs in the ac system;
a first resistance calculation module 308 for determining a first resistance of the superconducting ac current limiter according to the first shorted coil temperature;
a first determining module 310, configured to determine whether the first resistance exceeds a preset resistance, and whether a first short-circuit coil temperature of the superconducting ac current limiter exceeds a preset temperature;
a second determining module 312, configured to determine whether the short-circuit current disappears after the ac system is reclosed, when the first resistor does not exceed the preset resistor and/or the first short-circuit coil temperature does not exceed the preset temperature and the coil temperature of the superconducting ac current limiter before the ac system is reclosed is greater than the liquid nitrogen temperature;
a third parameter obtaining module 314, configured to obtain a final coil temperature of the superconducting ac current limiter when the short-circuit current disappears;
and a determining module 316, configured to determine that the superconducting ac current limiter is in a normal superconducting state when the final coil temperature is in a decreasing trend.
In one embodiment, further comprising:
the closing module is used for closing a bypass switch of the superconducting alternating current limiter when the final coil temperature is in a rising trend;
the judging module is also used for judging that the superconducting alternating current limiter is in a normal superconducting state when the temperature of the final coil is reduced;
and the disconnection module is used for disconnecting the bypass switch.
In one embodiment, further comprising:
the third parameter acquisition module is used for acquiring the temperature of a second short-circuit coil of the superconducting alternating current limiter when the short-circuit current does not disappear and the alternating current system sends a second short-circuit fault;
the second resistance calculation module is used for determining the second resistance of the superconducting alternating current limiter according to the temperature of the second short circuit coil;
the third judging module is used for judging whether the second resistance exceeds the preset resistance or not and whether the temperature of a second short circuit coil of the superconducting alternating current limiter exceeds the preset temperature or not;
and the fourth judging module is used for judging that the superconducting alternating current limiter is in a normal superconducting state when the second resistor does not exceed the preset resistor and/or the temperature of the second short circuit coil does not exceed the preset temperature.
In one embodiment, the determining module is further configured to determine that the superconducting ac current limiter is in the fault state when the second resistance exceeds a preset resistance and/or the second short-circuit coil temperature exceeds a preset temperature.
In one embodiment, the determining module is further configured to determine that the superconducting ac current limiter is in the fault state when the coil is in the quench state and the ac system is operating normally.
In one embodiment, the first resistance calculation module is further configured to determine the first resistance based on a temperature versus resistance curve.
In one embodiment, the third parameter obtaining module is further configured to obtain a second short-circuit coil temperature of the superconducting ac current limiter after the ac system is reclosed and the short-circuit current does not disappear after the ac system is reclosed, when the ac system sends a second short-circuit fault, if the coil temperature of the superconducting ac current limiter is equal to a liquid nitrogen temperature;
the second resistance calculation module is also used for determining the second resistance of the superconducting alternating current limiter according to the temperature of the second short circuit coil;
the third judging module is also used for judging whether the second resistance exceeds the preset resistance or not and whether the temperature of a second short circuit coil of the superconducting alternating current limiter exceeds the preset temperature or not;
and the fourth judging module is also used for judging that the superconducting alternating current limiter is in a normal superconducting state when the second resistor does not exceed the preset resistor and/or the temperature of the second short circuit coil does not exceed the preset temperature.
In one embodiment, the detection module is configured to detect the superconducting ac current limiter when the superconducting ac current limiter is in a fault state.
For specific limitations of the monitoring device for the state of the reclosing-based superconducting ac current limiter, reference may be made to the above limitations of the monitoring method for the state of the reclosing-based superconducting ac current limiter, and details thereof are not repeated herein. The modules in the monitoring device for the state of the reclosing-based superconducting alternating current limiter can be completely realized by software, hardware and a combination thereof. The modules can be embedded in a processor independent from the computer device in a hardware form, or can be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
An embodiment of the present invention further provides a computer device, where the computer device may be a server, and an internal structure diagram of the computer device may be as shown in fig. 4. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing data of the resistance equivalent model and the equivalent submodel, and storing equivalent resistance, working resistance and contact resistance obtained in the process of executing calculation. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a reclosing-based monitoring method of the state of the superconducting alternating current limiter.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation of the computing device to which the present application is applied, and that a particular computing device may include fewer components than those shown, combine certain components, and have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method steps in any one of the reclosing based monitoring method embodiments of the state of the superconducting ac current limiter when executing the computer program.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method in any one of the monitoring method embodiments for a reclose-based state of a superconducting ac current limiter.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The steps of a method algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A monitoring method of the state of a superconducting alternating current limiter based on reclosing is provided, the superconducting alternating current limiter is arranged in an alternating current system, and the monitoring method is characterized by comprising the following steps:
when the alternating current system normally operates, acquiring the initial coil temperature of the superconducting alternating current limiter, and determining whether a coil of the superconducting alternating current limiter is in a quench state or not according to the initial coil temperature;
when the coil is not in a quench state and a first short circuit fault occurs in the alternating current system, acquiring a first short circuit coil temperature of the superconducting alternating current limiter, determining a first resistance of the superconducting alternating current limiter according to the first short circuit coil temperature, and judging whether the first resistance exceeds a preset resistance and whether the first short circuit coil temperature of the superconducting alternating current limiter exceeds a preset temperature;
when the first resistor does not exceed a preset resistor and/or the temperature of the first short-circuit coil does not exceed a preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the temperature of liquid nitrogen before the alternating current system is reclosed, judging whether the short-circuit current disappears or not after the alternating current system is reclosed;
when the short circuit current disappears, acquiring the final coil temperature of the superconducting alternating current limiter;
and when the final coil temperature is in a descending trend, judging that the superconducting alternating current limiter is in a normal superconducting state.
2. The method of claim 1, further comprising: when the final coil temperature is in a rising trend, switching on a bypass switch of the superconducting alternating current limiter;
and when the final coil temperature is reduced, judging that the superconducting alternating current limiter is in a normal superconducting state, and disconnecting the bypass switch.
3. The method of claim 1, further comprising:
when the short-circuit current does not disappear and a second short-circuit fault is sent by the alternating current system, acquiring the temperature of a second short-circuit coil of the superconducting alternating current limiter, determining a second resistance of the superconducting alternating current limiter according to the temperature of the second short-circuit coil, judging whether the second resistance exceeds a preset resistance or not, and judging whether the temperature of the second short-circuit coil of the superconducting alternating current limiter exceeds the preset temperature or not;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
4. The method of claim 3, further comprising:
and when the second resistance exceeds a preset resistance and/or the temperature of the second short circuit coil exceeds a preset temperature, judging that the superconducting alternating current limiter is in a fault state.
5. The method according to any one of claims 1-4, further comprising:
and when the alternating current system normally operates and the coil is in a quench state, judging that the superconducting alternating current limiter is in a fault state.
6. The method of claim 5, wherein in the step of determining a first resistance of the superconducting alternating current limiter based on the first shorted coil temperature, comprises:
the first resistance is determined from a temperature versus resistance curve.
7. The method of claim 1, further comprising:
before the alternating current system is reclosed, the coil temperature of the superconducting alternating current limiter is equal to the liquid nitrogen temperature, when the alternating current system sends a second short-circuit fault if the short-circuit current does not disappear after the alternating current system is reclosed, the second short-circuit coil temperature of the superconducting alternating current limiter is obtained, a second resistance of the superconducting alternating current limiter is determined according to the second short-circuit coil temperature, whether the second resistance exceeds a preset resistance or not is judged, and whether the second short-circuit coil temperature of the superconducting alternating current limiter exceeds the preset temperature or not is judged;
and when the second resistance does not exceed the preset resistance and/or the temperature of the second short circuit coil does not exceed the preset temperature, judging that the superconducting alternating current limiter is in a normal superconducting state.
8. The utility model provides a monitoring devices of superconductive AC current limiter state based on reclosing, superconductive AC current limiter locates in the AC system, its characterized in that includes:
the first parameter acquisition module is used for acquiring the initial coil temperature of the superconducting alternating current limiter when the alternating current system normally operates;
the state determining module is used for determining whether a coil of the superconducting alternating current limiter is in a quench state according to the initial coil temperature;
the second parameter acquisition module is used for acquiring the temperature of a first short-circuit coil of the superconducting alternating current limiter when the coil is not in a quench state and a first short-circuit fault occurs in the alternating current system;
a first resistance calculation module for determining a first resistance of the superconducting alternating current limiter according to the first short circuit coil temperature;
the first judging module is used for judging whether the first resistance exceeds a preset resistance or not and whether the temperature of a first short circuit coil of the superconducting alternating current limiter exceeds a preset temperature or not;
the second judging module is used for judging whether the short-circuit current disappears or not after the alternating current system is reclosed when the first resistor does not exceed the preset resistor and/or the temperature of the first short-circuit coil does not exceed the preset temperature and the coil temperature of the superconducting alternating current limiter is higher than the temperature of liquid nitrogen before the alternating current system is reclosed;
the third parameter acquisition module is used for acquiring the final coil temperature of the superconducting alternating current limiter when the short-circuit current disappears;
and the judging module is used for judging that the superconducting alternating current limiter is in a normal superconducting state when the final coil temperature is in a descending trend.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1-7 are implemented when the program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| KR101050605B1 (en) * | 2009-08-07 | 2011-07-19 | 성균관대학교산학협력단 | Reclosing control system considering superconducting fault current limiter and its control method |
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| CN107819326A (en) * | 2016-09-12 | 2018-03-20 | 天津大学 | A kind of new superconductive direct current limiter |
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