CN112018740B - Method and device for designing superconducting direct current limiter based on reclosing - Google Patents
Method and device for designing superconducting direct current limiter based on reclosing Download PDFInfo
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- CN112018740B CN112018740B CN202010947129.9A CN202010947129A CN112018740B CN 112018740 B CN112018740 B CN 112018740B CN 202010947129 A CN202010947129 A CN 202010947129A CN 112018740 B CN112018740 B CN 112018740B
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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
- 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
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- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The invention provides a method and a device for designing a reclosing-based superconducting direct current limiter, wherein the method comprises the steps of obtaining parameters of the superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system and is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting strip; when the direct current system is in short circuit, determining whether the superconducting direct current limiter meets the design requirement or not according to the maximum short-circuit current of the direct current system, the current waveform and the parameters of the superconducting direct current limiter; when the superconducting direct current limiter meets the design requirement and after the direct current system is reclosed, if the direct current system fails to eliminate the fault, acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is short-circuited for the second time; and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement. The design method fully considers the reclosing factor of the direct current system, and the superconducting direct current limiter has good thermal stability.
Description
Technical Field
The invention relates to the technical field of design of superconducting direct current limiters, in particular to a method and a device for designing a superconducting direct current limiter based on reclosing, computer equipment and a computer readable storage medium.
Background
The problem that the fault short-circuit current is too large in the operation of the power grid is very common and needs to be solved, and the problem is usually solved by connecting a current limiter in series in the power grid. The current limiter displays low resistance when the power grid normally operates, and when the current of a short-circuit line of the power grid is increased to a certain degree, the resistance of the current limiter is increased so as to limit the short-circuit current.
A superconducting current limiter is a current limiter made using a superconducting material having special characteristics. Superconducting materials normally have almost zero electrical resistance, but when the current is increased to some extent (usually beyond its critical value), their superconducting properties are lost (i.e., "quenched"); at this time, the superconducting material exhibits high resistance characteristics, and meets the requirements that the current limiter has low resistance (or zero resistance) at normal current and high resistance at fault large current. Therefore, the superconducting direct current limiter can be applied to a power grid and plays a role in limiting short-circuit current.
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, a common superconducting current limiter often ignores the factor of reclosing in design, and the designed superconducting current limiter may have poor thermal stability.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for designing a superconducting direct current limiter based on reclosing, a computer device, and a computer readable storage medium, so as to overcome a problem that in the prior art, the factor of reclosing is often ignored when the superconducting current limiter is designed, which may cause poor thermal stability of the designed superconducting current limiter.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the invention provides a method for designing a superconducting direct current limiter based on reclosing, which comprises the following steps of:
acquiring parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
when the direct current system is short-circuited, determining whether the superconducting direct current limiter meets the design requirement according to the maximum short-circuit current, the current waveform and the parameters of the superconducting direct current limiter of the direct current system;
after the superconducting direct current limiter meets the design requirement and the direct current system is reclosed, if the fault of the direct current system is not eliminated, acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is short-circuited for the second time;
and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
Further, the air conditioner is provided with a fan,
further comprising: and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
Further, the air conditioner is provided with a fan,
further comprising: after the superconducting direct current limiter meets the design requirement and the direct current system is reclosed, if the direct current system fault is eliminated, acquiring first heat generated by a coil of the superconducting direct current limiter in unit time and second heat carried away by liquid nitrogen;
and when the first heat is smaller than the second heat, determining that the superconducting direct current limiter meets the reclosing requirement.
Further, the air conditioner is provided with a fan,
and when the first heat is larger than the second heat, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
Further, the air conditioner is characterized in that,
and when the superconducting direct current limiter does not meet the design requirement, adjusting the parameters of the superconducting direct current limiter.
Further, the air conditioner is provided with a fan,
the step of adjusting the parameters of the superconducting direct current limiter includes:
modifying the superconducting tape of the superconducting direct current limiter;
or modifying the number of coils and the serial and/or parallel connection mode of the superconducting direct current limiter.
Further, the air conditioner is provided with a fan,
further comprising: the types of the superconducting tapes are various, and each superconducting tape forms a superconducting direct current limiter;
when the plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter is selected according to the design boundary parameters and the economic principle of the superconducting direct current limiters.
The embodiment of the invention provides a device for designing a superconducting direct current limiter based on reclosing, which comprises:
the parameter acquisition module is used for acquiring parameters of the superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system and is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting strip material;
the first determining module is used for determining whether the superconducting direct current limiter meets the design requirement or not according to the maximum short-circuit current, the current waveform and the parameters of the superconducting direct current limiter of the direct current system when the direct current system is short-circuited;
the first temperature acquisition module is used for acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the superconducting direct current limiter meets the design requirement and the direct current system is reclosed and the direct current system is short-circuited for the second time if the direct current system fault is not eliminated;
and the second determining module is used for determining that the superconducting direct current limiter meets the reclosing requirement when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape.
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 executes the program to realize the following steps:
acquiring parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
when the direct current system is short-circuited, determining whether the superconducting direct current limiter meets the design requirement according to the maximum short-circuit current, the current waveform and the parameters of the superconducting direct current limiter of the direct current system;
when the superconducting direct current limiter meets the design requirement and after the direct current system is reclosed, if the direct current system fault is not eliminated, acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is short-circuited for the second time;
and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of:
acquiring parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
when the direct current system is in short circuit, determining whether the superconducting direct current limiter meets the design requirement according to the maximum short-circuit current of the direct current system, the current waveform and the parameters of the superconducting direct current limiter;
when the superconducting direct current limiter meets the design requirement and after the direct current system is reclosed, if the direct current system fault is not eliminated, acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is short-circuited for the second time;
and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
According to the design method, the device, the computer equipment and the computer readable storage medium of the reclosing-based superconducting direct current limiter, firstly, parameters of the superconducting direct current limiter are obtained, wherein the superconducting direct current limiter is arranged in a direct current system, and when the direct current system is short-circuited, whether the parameters of the superconducting direct current limiter meet design requirements or not is determined according to a maximum short-circuit and a current waveform of the direct current system; if the parameters of the superconducting direct current limiter meet the design requirements, after the direct current system is reclosed, if the fault of the direct current system is not eliminated, acquiring the first temperature of the superconducting tape of the superconducting direct current limiter when the direct current system is in a second short circuit; when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, the superconducting direct current limiter has a good effect of limiting the short-circuit current, and the superconducting direct current limiter is determined to meet the reclosing requirement. According to the design method of the superconducting direct current limiter based on the reclosing, the reclosing factor of a direct current system is fully considered, so that the designed superconducting direct current limiter can meet the reclosing requirement, and the thermal stability is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for designing a superconducting direct current limiter based on reclosing in an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for designing a reclosing-based superconducting direct current limiter according to an embodiment of the invention;
fig. 3 is a schematic flow chart of a method for designing a superconducting dc current limiter based on reclosing in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for designing a superconducting dc current limiter based on reclosing in an embodiment of the present invention;
fig. 5 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 described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to explain the present invention in more detail, a method, an apparatus, a computer device and a computer readable storage medium for designing a reclosing-based superconducting dc current limiter according to the present invention are specifically described below 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 designing a superconducting dc current limiter based on reclosing is provided, which is described by taking an example of applying the method to a terminal, and includes the following steps:
step S102, obtaining parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system and is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
the parameters of the superconducting dc current limiter mainly reflect the performance of the superconducting dc current limiter, and generally include thermal stability, quench resistance, critical current, and impact resistance. The parameters of the superconducting direct current limiter are determined according to the ultra-low direct current limiter prepared according to the design requirements (for example, a superconducting direct current limiter with the quenching resistance of A, the critical current of B, the thermal stability of C and the impact resistance of D needs to be designed, and then A, B, C and D are the parameters of the superconducting direct current limiter).
A superconducting dc current limiter is usually disposed in a dc system, connected in series with a power grid, and limits a short circuit when the power grid fails (i.e., is short-circuited).
The superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and the number of the coils and the series-parallel mode are determined according to resistance which can be generated by a single coil, current which can pass through the superconducting direct current limiter, resistance (namely quench resistance) required by the superconducting direct current limiter, through-current (namely critical current) and the like. The single coil is made of superconducting tapes, the types of the superconducting tapes are various, parameters of each superconducting tape are different, namely the properties of different superconducting tapes are different, and the parameters or properties of the single coil made of different superconducting tapes are different, such as the shape of the coil, the resistance of the coil and the current capable of passing through the coil. In addition, the parameters of the single coils prepared by the same superconducting tape can be the same or different (namely, the resistance and the current of the single coil prepared by the same superconducting tape can be the same or different); in practical application, however, for the convenience of designing the superconducting direct current limiter, the parameters of the single coils prepared by selecting the same superconducting tape are the same.
In addition, the parameters of the superconducting tape generally include the passing current, the quench resistance, and the stability against (current) impact.
Step S104, when the direct current system is short-circuited, determining whether the superconducting direct current limiter meets the design requirement according to the maximum short-circuit current, the current waveform and the parameters of the superconducting direct current limiter of the direct current system;
specifically, after the parameters of the superconducting direct current limiter are obtained, whether the superconducting direct current limiter meets the design requirements needs to be verified according to the parameters; although the superconducting dc current limiter is designed according to design requirements, there may be a relatively large difference between a theoretical value and an actual value, and therefore, the superconducting dc current limiter needs to be verified. The verification process can be carried out in a simulation or simulation mode, when the direct current system is in short circuit, parameters such as short-circuit current, current waveform and short-circuit time can be generated when the direct current system is in short circuit, and the parameters of the superconducting direct current limiter are substituted into the maximum short-circuit current and current waveform parameters to verify or check whether the superconducting direct current limiter meets the design requirements.
Step S106, after the superconducting direct current limiter meets the design requirement and is reclosed in the direct current system, if the fault of the direct current system is not eliminated, the first temperature of the superconducting tape of the superconducting direct current limiter is obtained when the direct current system is in a second short circuit;
and when the superconducting direct current limiter meets the design requirement, reclosing the direct current system, and after reclosing, if the fault of the direct current system is not eliminated, approving the design parameters of the superconducting direct current limiter according to the second short circuit. Because the superconducting coil in the superconducting direct current limiter is soaked in liquid nitrogen, the liquid nitrogen can take away the heat of the superconducting coil, and the liquid nitrogen can take away the heat of the superconducting tape in the period from the short circuit of the direct current system to the reclosing, so that the temperature of the superconducting tape is reduced; after reclosing, if the system fault is not eliminated, the superconducting direct current limiter can continuously generate heat and the temperature of the superconducting tape can be further increased when the superconducting direct current limiter is in a second short circuit; at the moment, the temperature of the superconducting tape is obtained and is the first temperature of the superconducting tape; when the temperature of the superconducting tape is obtained, the superconducting tape in any coil in the superconducting direct current limiter can be selected, or a plurality of superconducting tapes can be selected; in general, for the sake of verification, the superconducting tape of any one of the coils is selected to collect the temperature thereof.
And S108, when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
To ensure that the coil does not burn out, the first temperature of the superconducting tape needs to be within a tolerable range for the coil (typically less than the temperature to which the superconducting tape is subjected). If the first temperature of the superconducting tape exceeds the standard, the superconducting current limiter cannot meet the reclosing requirement.
The design method of the reclosing-based superconducting direct current limiter in the embodiment of the invention comprises the steps of firstly obtaining parameters of the superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, and when the direct current system is short-circuited, determining whether the parameters of the superconducting direct current limiter meet design requirements according to a maximum short-circuit and a current waveform of the direct current system; if the parameters of the superconducting direct current limiter meet the design requirements, after the direct current system is reclosed, if the fault of the direct current system is not eliminated, acquiring the first temperature of the superconducting tape of the superconducting direct current limiter when the direct current system is in a second short circuit; when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, the superconducting direct current limiter has a good effect of limiting the short-circuit current, and the superconducting direct current limiter is determined to meet the reclosing requirement. According to the design method of the superconducting direct current limiter based on the reclosing, the reclosing factor of a direct current system is fully considered, so that the designed superconducting direct current limiter can meet the reclosing requirement, and the thermal stability is good.
In one embodiment, further comprising: and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
Specifically, when the first temperature of the superconducting tape is lower than the temperature endured by the superconducting tape, it indicates that the first temperature of the superconducting tape exceeds the tolerable range of the coil, i.e. the coil may be blown; in this case, it is determined that the superconducting dc current limiter does not satisfy the reclosing requirement, and parameters of the superconducting dc current limiter need to be adjusted, for example, the number of coils in series may need to be increased to suppress the short-circuit current, or the number of coils in parallel may need to be increased to reduce the short-circuit current applied to a single coil.
In one embodiment, as shown in fig. 2, further includes:
step S202, after the superconducting direct current limiter meets the design requirements and is reclosed in a direct current system, if the fault of the direct current system is eliminated, acquiring first heat generated by a coil of the superconducting direct current limiter in unit time and second heat carried away by liquid nitrogen;
and step S204, when the first heat is smaller than the second heat, determining that the superconducting direct current limiter meets the reclosing requirement.
Specifically, when the superconducting direct current limiter meets the design requirement, the direct current system is reclosed, after reclosing, if the fault of the direct current system is eliminated, the coil is in normal operation current, the temperature of the superconducting strip does not recover to the temperature of liquid nitrogen at the moment, namely, the coil does not recover to a normal working state, the coil can continuously generate heat through the current, and at the moment, in order to ensure the normal operation of the system, the heat (namely, the second heat) taken away by the liquid nitrogen needs to be larger than the heat (namely, the first heat) generated by the current; then, the temperature of the coil continuously decreases and gradually returns to the liquid nitrogen temperature, and after the temperature decreases, the resistance decreases, the heat generated by the current is further reduced, the current limiter finally returns to the liquid nitrogen temperature, and the current also normally operates. Therefore, when the first heat is smaller than the second heat, the superconducting direct current limiter is determined to meet the reclosing requirement. The method is a determination method of the superconducting direct current limiter under the condition of eliminating system faults after reclosing, fully considers the influence of reclosing, ensures that the designed superconducting direct current limiter meets the requirement of reclosing, and has good thermal stability.
In one embodiment, when the first heat is greater than the second heat, it is determined that the superconducting direct current limiter does not meet the reclosing requirement, and parameters of the superconducting direct current limiter are adjusted.
Specifically, the amount of heat taken away by the liquid nitrogen is less than the amount of heat generated by the current, that is, when the first amount of heat is greater than the second amount of heat, it indicates that the temperature of the coil of the superconducting dc current limiter continuously rises, the maximum temperature of the coil may exceed the maximum temperature that the coil can bear (which is generally referred to as superconducting tape tolerance problem), and the superconducting tape may be blown, so that the superconducting dc current limiter cannot perform the function of dc current limiting. Therefore, at this time, it is determined that the superconducting dc current limiter does not meet the reclosing requirement, and the superconducting dc current limiter needs to be adjusted, for example, the number of parallel coils of the current limiter needs to be increased, so that the current passing through the single coil is reduced, and the heat generation is also reduced until the heat is less than the heat carried away by the liquid nitrogen.
In one embodiment, when the superconducting direct current limiter does not meet design requirements, parameters of the superconducting direct current limiter are adjusted.
Specifically, when the superconducting direct current limiter does not meet the design requirement, the parameters of the superconducting direct current limiter are adjusted, so that the adjusted superconducting direct current limiter meets the design requirement, then a reclosing test is performed, and whether the adjusted superconducting direct current limiter meets the requirement of reclosing is further judged.
In one embodiment, the step of adjusting the parameters of the superconducting dc current limiter includes:
modifying the superconducting tape of the superconducting direct current limiter; or modifying the number of coils of the superconducting direct current limiter and the serial and/or parallel connection mode.
Specifically, the parameters of the superconducting direct current limiter are adjusted by adjusting the parameters of the superconducting tape (for example, replacing the superconducting tape); or modifying the number of coils of the superconducting direct current limiter and the serial and/or parallel connection mode. For example, if the quench resistance of the superconducting direct current limiter is not large enough, the number of coils in series connection can be increased, and if the critical current is not large enough, the critical current of a single strip can be increased or the number of coils in parallel connection can be increased. If the thermal stability of the coil is not enough, the number of the coils in series connection can be increased to inhibit the short-circuit current to a greater extent, or a strip material with stronger impact resistance is replaced, or more coils are connected in parallel, so that the impact current of a single coil is reduced, and the overall thermal stability of the current limiter is increased.
In one embodiment, further comprising: the types of the superconducting tapes are various, and each superconducting tape forms a superconducting direct current limiter;
when the plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter is selected according to the design boundary parameters and the economic principle of the superconducting direct current limiters.
Specifically, the superconducting tapes are of various types, and each superconducting tape may be designed with a superconducting direct current limiter; when the designed plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter can be selected according to the design boundary parameters and the economic principle of the superconducting direct current limiter. By adopting the method, the optimal superconducting direct current limiter meeting the requirement can be selected.
To facilitate understanding of the present solution, a detailed embodiment is given. As shown in fig. 3, a method for designing a superconducting dc current limiter based on reclosing includes: 1. the parameters of the superconducting tape are determined, one type of tape of the existing superconducting tape product is generally adopted for design, and then modification and correction are carried out according to requirements.
2. And determining parameters of a single coil, and determining the shape and the size of the single coil and the quantity of the used superconducting tapes according to system requirements. Assuming that a single coil can generate a resistance of R0, a current I0 can be passed.
3. According to design requirements, the number of the coils connected in series and in parallel is preliminarily determined, and parameters of the superconducting direct current limiter are calculated. Assuming that the number of series connection of the single coils is m, and the number of parallel connection is n, the superconducting direct current limiter has the generation resistance of R0 m/n, and the current capacity of I0 n. The larger m is, the larger the number of series connections is, the larger the quench resistance is. The larger the parallel number n is, the larger the parallel number is, the larger the current capacity and short-circuit current tolerance thereof are.
4. And checking the parameters of the superconducting direct current limiter according to the maximum short-circuit current impact capacity of the direct current system. Generally, the short-circuit current of the direct current system has no zero crossing point, the off time T1, the heat Q1 and the temperature of the superconducting tape are T1. According to the system simulation, the maximum short-circuit current, the current waveform, the time and other parameters of the direct current system during short circuit can be known, and according to the parameters, the parameters of the superconducting direct current limiter can be substituted to check whether the superconducting direct current limiter meets the requirements.
5. If the superconducting direct current limiter does not meet the design requirements, the parameters of the superconducting tape (usually, the superconducting tape is replaced) or the serial-parallel number of the coils can be modified. For example, if the quench resistance is not large enough, the number of coils in series can be increased, and if the critical current is not large enough, the critical current of a single strip can be increased or the number of coils in parallel can be increased. If the thermal stability of the coil is not enough, the number of the coils in series connection can be increased to inhibit the short-circuit current to a greater extent, or a strip material with stronger impact resistance is replaced, or more coils are connected in parallel, so that the impact current of a single coil is reduced, and the overall thermal stability of the current limiter is increased.
6. And if the superconducting direct current limiter meets the design requirement, performing the next calculation.
7. And when the system is reclosed for time T2, the superconducting coil in the current limiter is soaked in liquid nitrogen, the liquid nitrogen can take away the heat of the superconducting coil, the heat taken away by the liquid nitrogen is Q2 after the time T2, and the temperature of the superconducting strip is reduced to T2.
8. Because the direct current reclosing time is relatively short, generally, the temperature of the superconducting tape does not return to the liquid nitrogen temperature, and the T2 temperature is used as the starting point of the next calculation and check. After the system is reclosed, if the fault is not eliminated, the initial temperature T2 of the superconducting tape generates heat Q3 after the time T3, and the temperature of the tape rises to T3.
9. In order to ensure that the coil does not burn out, the temperature T3 (i.e. the first temperature of the superconducting tape of the superconducting dc current limiter during the second short circuit) needs to be within the tolerable range of the coil. If the T3 temperature exceeds the standard, the superconducting direct current limiter cannot meet the reclosing requirement, and the number of the coils in series connection is increased to restrain short-circuit current or the number of the coils in parallel connection is increased to reduce the short-circuit current born by a single coil.
10. If the fault of the direct current system is eliminated after reclosing, the coil is in the normal operation current I, the temperature of the superconducting tape is T2, the coil does not return to the normal working state at the temperature of T2, and the coil can continuously generate heat when passing through the current I; at this time, in order to ensure that the system normally operates, the heat (i.e. the second heat) taken away by the liquid nitrogen needs to be greater than the heat (i.e. the first heat) generated by the current, at this time, the temperature of the coil continuously decreases and gradually returns to the temperature of the liquid nitrogen, and after the temperature decreases, the resistance decreases, the heat generated by the current is further reduced, the current limiter finally returns to the temperature of the liquid nitrogen, and the current also normally operates.
11. If checking finds that the heat taken by the liquid nitrogen is smaller than the heat generated by the current under the normal current, the temperature of the current limiter coil can continuously rise, and the design requirement is not met, the parallel number of the current limiter coil needs to be increased, the current passing through the single coil is reduced, and the heat generation is reduced until the heat taken by the liquid nitrogen is smaller.
12. If the above conditions are met, the current limiter meets the reclosing requirement. In this case, according to the design method, the design boundary parameters of the dc-limiter are determined (and a plurality of possible design solutions are determined), and the determination solution is preferably determined according to economic principles. For example, it is possible to increase the number of series-connected current limiters and increase the quench resistance without limitation, but this is not an economically optimal solution.
It should be understood that although the various steps in the flow diagrams of fig. 1-3 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. 1-3 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 order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
The above embodiments of the present disclosure describe in detail a method for designing a superconducting dc current limiter based on reclosing, 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 designing a superconducting dc current limiter based on reclosing corresponding to the above method, and the following specific embodiments are described in detail.
Referring to fig. 4, a device for designing a superconducting dc current limiter based on reclosing according to an embodiment of the present invention mainly includes:
a parameter obtaining module 402, configured to obtain parameters of a superconducting direct current limiter, where the superconducting direct current limiter is disposed in a direct current system, and the superconducting direct current limiter is formed by connecting multiple coils in series and/or in parallel, and each coil is made of a superconducting tape;
a first determining module 404, configured to determine whether the superconducting dc current limiter meets design requirements according to a maximum short-circuit current of the dc system, a current waveform, and parameters of the superconducting dc current limiter when the dc system is short-circuited;
a first temperature obtaining module 406, configured to obtain a first temperature of a superconducting tape of the superconducting dc current limiter when the superconducting dc current limiter meets design requirements and after the dc system is reclosed, and the dc system is short-circuited for a second time if the fault of the dc system is not eliminated;
and a second determining module 408, configured to determine that the superconducting direct current limiter meets the reclosing requirement when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape.
In one embodiment, further comprising:
and the parameter adjusting module is used for determining that the superconducting direct current limiter does not meet the reclosing requirement and adjusting the parameters of the superconducting direct current limiter when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape.
In one embodiment, further comprising:
the heat acquisition module is used for acquiring first heat generated by a coil of the superconducting direct current limiter in unit time and second heat taken away by liquid nitrogen if the fault of the direct current system is eliminated after the superconducting direct current limiter is reclosed in the direct current system according with the design requirement;
and the second determining module is further used for determining that the superconducting direct current limiter meets the reclosing requirement when the first heat is smaller than the second heat.
In one embodiment, the second determining module is further configured to determine that the superconducting direct current limiter does not meet the reclosing requirement when the first heat is greater than the second heat;
and the parameter adjusting module is also used for adjusting the parameters of the superconducting direct current limiter.
In an embodiment, the parameter adjusting module is further configured to adjust a parameter of the superconducting dc current limiter when the superconducting dc current limiter does not meet a design requirement.
In one embodiment, the parameter adjusting module further comprises: strip modification module or coil modification module:
the tape modifying module is used for modifying the superconducting tape of the superconducting direct current limiter;
and the coil modification module is used for modifying the number of coils of the superconducting direct current limiter and the serial and/or parallel connection mode.
In one embodiment, the superconducting tapes are of a plurality of types, each forming a superconducting DC current limiter; further comprising: a current limiter selection module:
and the current limiter selection module is used for selecting the optimal superconducting direct current limiter according to the design boundary parameters and the economic principle of the superconducting direct current limiter when the plurality of superconducting direct current limiters meet the reclosing requirement.
For specific limitations of the device for designing the superconducting dc current limiter based on reclosing, reference may be made to the above limitations on the method for designing the superconducting dc current limiter based on reclosing, and details are not described herein again. The various modules in the above-described apparatus may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also 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. 5. 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 operating system and the computer program to run on 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 method for designing a recloser-based superconducting direct current limiter.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program: acquiring parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape; when the direct current system is in short circuit, determining whether the superconducting direct current limiter meets the design requirement or not according to the maximum short-circuit current of the direct current system, the current waveform and the parameters of the superconducting direct current limiter; after the superconducting direct current limiter meets the design requirements and a direct current system is reclosed, if the fault of the direct current system is not eliminated, acquiring the first temperature of the superconducting tape of the superconducting direct current limiter when the direct current system is in a second short circuit; and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
In one embodiment, the processor, when executing the computer program, further performs the steps of: further comprising: and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the processor, when executing the computer program, further performs the steps of: further comprising: after the superconducting direct current limiter meets the design requirement and is reclosed in a direct current system, if the fault of the direct current system is eliminated, first heat generated by a coil of the superconducting direct current limiter in unit time and second heat taken away by liquid nitrogen are obtained; and when the first heat is smaller than the second heat, determining that the superconducting direct current limiter meets the reclosing requirement.
In one embodiment, the processor when executing the computer program further performs the steps of: and when the first heat is greater than the second heat, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the processor when executing the computer program further performs the steps of: and when the superconducting direct current limiter does not meet the design requirement, adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the processor, when executing the computer program, further performs the steps of: the step of adjusting parameters of the superconducting direct current limiter includes: modifying the superconducting tape of the superconducting direct current limiter;
or modifying the number of coils of the superconducting direct current limiter and the serial and/or parallel connection mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of: further comprising: the types of the superconducting tapes are various, and each superconducting tape forms a superconducting direct current limiter; when the plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter is selected according to the design boundary parameters and the economic principle of the superconducting direct current limiters.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps: obtaining parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system and is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape; when the direct current system is in short circuit, determining whether the superconducting direct current limiter meets the design requirement or not according to the maximum short-circuit current of the direct current system, the current waveform and the parameters of the superconducting direct current limiter; after the superconducting direct current limiter meets the design requirement and is reclosed in the direct current system, if the fault of the direct current system is not eliminated, acquiring the first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is in a second short circuit; and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
In one embodiment, the computer program when executed by the processor further performs the steps of: further comprising: and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the computer program when executed by the processor further performs the steps of: further comprising: after the superconducting direct current limiter meets the design requirement and is reclosed in a direct current system, if the fault of the direct current system is eliminated, first heat generated by a coil of the superconducting direct current limiter in unit time and second heat taken away by liquid nitrogen are obtained; and when the first heat is smaller than the second heat, determining that the superconducting direct current limiter meets the reclosing requirement.
In one embodiment, the computer program when executed by the processor further performs the steps of: and when the first heat is greater than the second heat, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the computer program when executed by the processor further performs the steps of: and when the superconducting direct current limiter does not meet the design requirement, adjusting the parameters of the superconducting direct current limiter.
In one embodiment, the computer program when executed by the processor further performs the steps of: the step of adjusting the parameters of the superconducting direct current limiter comprises the following steps: modifying a superconducting tape of the superconducting direct current limiter;
or modifying the number of coils of the superconducting direct current limiter and the serial and/or parallel connection mode.
In one embodiment, the computer program when executed by the processor further performs the steps of: further comprising: the types of the superconducting tapes are various, and each superconducting tape forms a superconducting direct current limiter; when the plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter is selected according to the design boundary parameters and the economic principle of the superconducting direct current limiters.
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 or 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 method for designing a superconducting direct current limiter based on reclosing is characterized by comprising the following steps:
acquiring parameters of a superconducting direct current limiter, wherein the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
when the direct current system is in short circuit, determining whether the superconducting direct current limiter meets the design requirement according to the maximum short-circuit current of the direct current system, the current waveform and the parameters of the superconducting direct current limiter;
when the superconducting direct current limiter meets the design requirement and after the direct current system is reclosed, if the direct current system fault is not eliminated, acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the direct current system is short-circuited for the second time;
and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter meets the reclosing requirement.
2. The method of claim 1, further comprising:
and when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape, determining that the superconducting direct current limiter does not meet the reclosing requirement, and adjusting the parameters of the superconducting direct current limiter.
3. The method of claim 2, further comprising:
when the superconducting direct current limiter meets the design requirement and after the direct current system is reclosed, if the direct current system fault is eliminated, acquiring first heat generated by a coil of the superconducting direct current limiter in unit time and second heat carried away by liquid nitrogen;
and when the first heat is smaller than the second heat, determining that the superconducting direct current limiter meets the reclosing requirement.
4. The method of claim 3, wherein when the first heat is greater than the second heat, determining that the superconducting DC current limiter does not meet a reclosing requirement, and adjusting parameters of the superconducting DC current limiter.
5. The method according to any one of claims 1 to 4, wherein the parameters of the superconducting direct current limiter are adjusted when the superconducting direct current limiter does not meet the design requirements.
6. The method as claimed in claim 5, wherein the step of adjusting the parameters of the superconducting direct current limiter comprises:
modifying the superconducting tape of the superconducting direct current limiter;
or modifying the number of coils and the serial and/or parallel connection mode of the superconducting direct current limiter.
7. The method of claim 6, further comprising: the types of the superconducting tapes are various, and each superconducting tape forms a superconducting direct current limiter;
when the plurality of superconducting direct current limiters meet the reclosing requirement, the optimal superconducting direct current limiter is selected according to the design boundary parameters and the economic principle of the superconducting direct current limiters.
8. A device for designing a superconducting direct current limiter based on reclosing is characterized by comprising:
the superconducting direct current limiter comprises a parameter acquisition module, a parameter selection module and a parameter selection module, wherein the parameter acquisition module is used for acquiring parameters of the superconducting direct current limiter, the superconducting direct current limiter is arranged in a direct current system, the superconducting direct current limiter is formed by connecting a plurality of coils in series and/or in parallel, and each coil is made of a superconducting tape;
the first determining module is used for determining whether the superconducting direct current limiter meets the design requirement or not according to the maximum short-circuit current, the current waveform and the parameters of the superconducting direct current limiter of the direct current system when the direct current system is in short circuit;
the first temperature acquisition module is used for acquiring a first temperature of a superconducting tape of the superconducting direct current limiter when the superconducting direct current limiter meets design requirements and after the direct current system is reclosed and if the direct current system fault is not eliminated, the direct current system is in a second short circuit;
and the second determining module is used for determining that the superconducting direct current limiter meets the reclosing requirement when the first temperature of the superconducting tape is lower than the tolerance temperature of the superconducting tape.
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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| CN1391324A (en) * | 2002-06-27 | 2003-01-15 | 浙江大学 | Current limiter with by-pass inductor for short-circuit failure |
| CN2759030Y (en) * | 2004-08-11 | 2006-02-15 | 天津理工大学 | Bridge superconducting current limiter controller based on DSP |
| KR101063815B1 (en) * | 2009-07-02 | 2011-09-08 | 숭실대학교산학협력단 | Recloser-Fuse Coordination Techniques for Superconducting Current Limiters in Distribution Systems |
| JP2011024338A (en) * | 2009-07-15 | 2011-02-03 | Toshiba Corp | Superconducting application current limiter, superconducting application current limiting method, program, and recording medium |
| CN109888756A (en) * | 2019-04-12 | 2019-06-14 | 广东电网有限责任公司 | A kind of superconducting current-limiting circuit, superconducting current-limiting control system and control method |
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