CN114884040B - Fault current limiter and optimization method thereof - Google Patents
Fault current limiter and optimization method thereof Download PDFInfo
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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
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Abstract
The application relates to a fault current limiter and an optimization method of the fault current limiter. The fault current limiter comprises a fixed part, a movable part and a winding; the fixed component and the movable component are spaced by a preset distance, and the winding is arranged on the fixed component; if the current on the winding meets the preset limiting condition, the magnetic force generated by the winding adsorbs the moving part to move towards the fixed part so as to reduce the current on the winding. The fault current limiter provided by the application can be reused without replacement, and the operation and maintenance cost of the power transmission line is reduced.
Description
Technical Field
The application relates to the technical field of electricians, in particular to a fault current limiter and an optimization method of the fault current limiter.
Background
The fault current limiter (Fault Current Limiter, FCL) is connected in series with the power transmission line and is used for protecting the circuit by increasing impedance or switching and other different modes under the condition that the power transmission line has fault current or over-voltage.
At present, the FCL increases impedance in a fusing mode, so that fault current is reduced, and the effect of a protection circuit is achieved. However, the fused FCL cannot be used continuously, and the fused FCL needs to be replaced, so that the operation and maintenance cost of the power transmission line is high, and the daily operation and maintenance requirements of the power grid are difficult to meet.
Disclosure of Invention
The fault current limiter and the optimization method thereof can be reused without replacement, and the operation and maintenance cost of the power transmission line is reduced.
In a first aspect, the present application provides a fault current limiter. The fault current limiter comprises: a fixed part, a moving part, and a winding; the fixed component and the movable component are spaced by a preset distance, and the winding is arranged on the fixed component;
if the current on the winding meets the preset limiting condition, the magnetic force generated by the winding adsorbs the moving part to move towards the fixed part so as to reduce the current on the winding.
In one embodiment, the preset condition includes at least one of an increment within a preset time period being greater than a preset increment threshold, and a current value being greater than a preset current value.
In one embodiment, the fault current limiter further comprises an elastic component; the elastic component is arranged between the moving component and the fixed component.
In one embodiment, the fault current limiter further comprises a resistor; a resistor is connected in series with the winding.
In a second aspect, the present application also provides a method for optimizing a fault current limiter, applied to the fault current limiter as in the first aspect, the method comprising:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In one embodiment, optimizing the objective function by using a preset algorithm, determining the target value of the optimization parameter includes: carrying out iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation; and if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining a target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
In one embodiment, the target value of the optimization parameter is determined according to the performance quantization value at the end of the iterative operation, including at least one of the following: determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter; determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter; and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving part.
In a third aspect, the application further provides an optimizing device of the fault current limiter. The device comprises:
The optimization parameter determining module is used for determining the optimization parameters of the fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
The objective function determining module is used for determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And the optimization processing module is used for optimizing the objective function by adopting a preset algorithm and determining the target value of the optimization parameter.
In a fourth aspect, the present application also provides a computer device. The computer device comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the following steps:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In a fifth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In a sixth aspect, the application also provides a computer program product. The computer program product comprising a computer program which, when executed by a processor, performs the steps of:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
The fault current limiter provided by the application comprises a fixed part, a movable part and a winding; the fixed component and the movable component are spaced by a preset distance, and the winding is arranged on the fixed component; if the current on the winding meets the preset limiting condition, the magnetic force generated by the winding adsorbs the moving part to move towards the fixed part so as to reduce the current on the winding. In the application, when fault current flows through the winding, magnetic force is generated, the movable part is adsorbed to the fixed part under the action of the magnetic force, after the effect of reducing the fault current is achieved, the movable part can be reset through manual adjustment, and the distance between the movable part and the fixed part is recovered, so that the repeated utilization of the fault current limiter is realized, and the operation and maintenance cost of a power grid is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a fault current limiter in one embodiment;
FIG. 2 is a schematic diagram of the relationship between air gap thickness and inductance of a fault current limiter in one embodiment;
FIG. 3 is a schematic diagram of the relationship between fault current and flux linkage in one embodiment;
FIG. 4 is another schematic diagram of a fault current limiter in one embodiment;
FIG. 5 is another schematic diagram of a fault current limiter in one embodiment;
FIG. 6 is a schematic diagram of an equivalent circuit of a fault current limiter in one embodiment;
FIG. 7 is a flow diagram of a method of optimizing a fault current limiter in one embodiment;
FIG. 8 is another flow diagram of a method of optimizing a fault current limiter in one embodiment;
FIG. 9 is another flow diagram of a method of optimizing a fault current limiter in one embodiment;
FIG. 10 is a block diagram of an optimization device of a fault current limiter in one embodiment;
FIG. 11 is an internal block diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
At present, the FCL increases impedance in a fusing mode, so that fault current is reduced, and the effect of a protection circuit is achieved. However, the fused FCL cannot be used continuously, and the fused FCL needs to be replaced, so that the operation and maintenance cost of the power transmission line is high, and the daily operation and maintenance requirements of the power grid are difficult to meet.
Based on the fault current limiter, the fault current limiter can be reused without replacement, and the operation and maintenance cost of a power grid is greatly reduced.
In one embodiment, as shown in FIG. 1, a fault current limiter is provided. The fault current limiter comprises: a fixed part 10, a moving part 20 and a winding 30; the fixed part 10 and the moving part 20 are spaced apart by a preset distance, and the winding 30 is disposed on the fixed part 10; if the current on the winding 30 meets the preset limit condition, the magnetic force generated by the winding 30 attracts the moving part 20 to move toward the fixed part 10, so as to reduce the current on the winding 30.
Wherein the preset limiting condition comprises at least one of an increment within a preset time period being greater than a preset increment threshold value and a current value being greater than a preset current value. Wherein V is the voltage of the transmission line.
Based on the basic principle of the variable reactor, in the fault current limiter composed of the fixed part 10, the movable part 20, and the winding 30 provided on the fixed part, the thickness of the air gap existing between the fixed part 10 and the movable part 20 may affect the inductance of the fault current limiter. And the air gap thickness and the inductance of the fault current limiter are in a non-linear relationship as shown in figure 2. Wherein L is the inductance of the fault current limiter; delta is the thickness of the air gap between the moving part 20 and the fixed part 10. When the air gap between the fixed part 10 and the moving part 20 is greater than a certain value, the inductance of the fault current limiter is small, so that the reactance of the fault current limiter is small; as the thickness of the air gap between the fixed part 10 and the moving part 20 gradually decreases, the inductance of the fault current limiter gradually increases; when the air gap thickness is further reduced, the inductance of the fault current limiter increases rapidly, so that the inductance of the fault current limiter is extremely large when the air gap thickness is extremely small. I.e. the air gap between the fixed part 10 and the moving part 20 is very small, the reactance of the fault current limiter is very large.
Therefore, in the embodiment of the present application, the fixed component 10 and the movable component 20 may be spaced by a preset distance, so that the inductance of the fault current limiter under the normal working condition is smaller, and the normal operation of the power transmission line is not affected. When the transmission line has fault current, the current flowing through the winding 30 increases, if the increment of the current in the preset time period is larger than a preset increment threshold (i.e. the increment of the current in a short time period is larger) or the current value is larger than a preset current value (i.e. the current is increased to a larger value), based on the electromagnetic induction principle, the current flowing through the winding 30 generates magnetic force, so that the movable part 20 is attracted to move towards the fixed part 10, the thickness of an air gap between the fixed part 10 and the movable part 20 is reduced, and the inductance of the fault current limiter is increased, namely the reactance of the fault current limiter is increased. Thereby achieving the effects of reducing fault current and protecting the power transmission line.
The fixing member 10 may be an insulator, or may be a medium such as ferrite, iron core, or copper core. Preferably, the fixing member 10 may be a core to enhance the strength of the magnetic field generated by the coil. The moving part 20 can be a conductor such as ferrite, iron core, copper core, etc., can move to the fixed part 20 fast in the magnetic field, reduce the air gap thickness in a short time, increase the reactance of the fault current limiter, thereby reducing the damage to the transmission line.
In addition, when the moving member 20 moves, a reverse electromotive force is generated in the winding 30, and the direction of the reverse electromotive force is opposite to the voltage direction of the power transmission line, so that the voltage of the power transmission line can be reduced to some extent, and thus, the fault current can be reduced. And based on the law of conservation of energy, when the moving part 20 moves, part of the energy of the transmission line can be converted into mechanical energy for the moving part 20 to move, so that fault current is reduced to a certain extent.
Moreover, when the air gap between the fixed member 10 and the movable member 20 is different, the relationship between the flux linkage of the winding 30 and the fault current is also different. As shown in fig. 3, fig. 3 is a graph of the change in fault current and flux linkage as the stationary member moves. Where λ is the flux linkage, i is the fault current, and x is the thickness of the air gap (i.e., the distance between the stationary part 10 and the moving part 20). Wherein x 2<x1. Since the moving speed of the moving member 20 is very fast, the flux linkage remains unchanged when the moving member 20 moves to the fixed member 10 (i.e., the curve changes from x=x 1 to x=x 2). As can be seen from fig. 3, with the flux linkage remaining unchanged, the point a on the curve will move to point b and the fault current will change from i 2 to i 1. Namely, the fault current is reduced, and the effect of protecting the power transmission line is achieved.
The embodiment of the application provides a fault current limiter, which comprises a fixed part, a movable part and a winding; the fixed component and the movable component are spaced by a preset distance, and the winding is arranged on the fixed component; if the current on the winding meets the preset limiting condition, the magnetic force generated by the winding adsorbs the moving part to move towards the fixed part so as to reduce the current on the winding. In the embodiment of the application, when fault current flows through the winding, magnetic force is generated, the movable part is adsorbed to the fixed part under the action of the magnetic force, after the action of reducing the fault current is achieved, the movable part can be reset through manual adjustment, and the distance between the movable part and the fixed part is recovered, so that the repeated utilization of the fault current limiter is realized, and the operation and maintenance cost of a power grid is greatly reduced.
In one embodiment, as shown in FIG. 4, the fault current limiter may further include a resilient assembly 40; the elastic member 40 is disposed between the moving member 20 and the fixed member 10. The elastic member 40 may include two springs respectively disposed at both ends of the moving part 20. The elastic assembly 40 may reset the moving part 20 adsorbed on the fixed part 10 after the circuit of the power transmission line is restored, and restore the preset distance between the fixed part 10 and the moving part 20. Meanwhile, the inductance of the fault current limiter is restored to be small, and the influence on the normal work of the power transmission line is avoided.
In one embodiment, as shown in FIG. 5, the fault current limiter may also include a 50 resistance; a resistor 50 is connected in series with the winding 30. Resistor 50 acts as a load for the fault current limiter and is used to withstand some of the power of the fault current limiter and acts to protect the fault current limiter.
Based on the above embodiment, according to the following formulas (1) to (4), an equivalent circuit of the fault current limiter as shown in fig. 6 can be obtained. The equivalent circuit comprises a resistor R, an inductance L and a reverse power supply e. Wherein R is the resistance of the fault current limiter; l is the inductance of the fault current limiter; e is a counter electromotive force generated from the winding 30 when the moving member 20 moves; i is fault current; v is the voltage of the transmission line; e and V are in opposite directions.
λ＝L(x,i)·i (2)
Wherein, the formula (1) represents the voltage of the power transmission line under normal operation; formula (2) represents a flux linkage; formula (3) represents a counter electromotive force; the formula (4) represents the voltage of the transmission line when fault current occurs; t represents a movement time period of the moving member 20 to the fixed member 10; λ (x, i) represents the flux linkage with an air gap x and a fault current i; l (x, i) represents the inductance of the fault current limiter with an air gap x and a fault current i; v represents the moving speed of the moving member 20;
In one embodiment, as shown in fig. 7, the embodiment of the present application further provides an optimization method of the fault current limiter, which is used for performing parameter optimization on the fault current limiter provided by the embodiment. The embodiment of the application is applied to the terminal for illustration by the method, and it can be understood that the method can also be applied to the server, can also be applied to a system comprising the terminal and the server, and can be realized through interaction of the terminal and the server. In this embodiment, the method includes the steps of:
step 101, determining optimization parameters of a fault current limiter; the optimization parameters include at least one of a volume of the fault current limiter, an initial inductance, and a length of time the moving component in the fault current limiter is moved.
To improve the performance of the fault current limiter in the above embodiments, the fault current limiter may be optimized in terms of three aspects of footprint, grid short circuit level, and durability.
Wherein the space occupation of the fault current limiter can be optimized by reducing the volume. The initial inductance of the fault current limiter is reduced, the difference value between the inductance of the fault current limiter after the fault current occurs and the initial inductance is increased, and the reactance of the fault current limiter is increased, so that the grid short circuit level of the fault current limiter is optimized. By reducing the moving time period for the moving member 20 to move to the fixed member 10, the speed at which the reactance of the fault current limiter increases is increased, thereby optimizing the durability of the fault current limiter.
Thus, the optimization parameters of the fault current limiter may include at least one of a volume, an initial inductance, and a length of movement of the moving parts in the fault current limiter.
102, Determining an objective function according to the optimization parameters; the objective function is used to characterize the relationship between the quantified value of the performance of the fault current limiter and the volume of the fault current limiter, the initial inductance, and the length of time the moving part is moved.
To improve the performance of the fault current limiter, the volume of the fault current limiter, the initial inductance, and the length of movement of the moving parts may be reduced. Thus, the objective function can be represented by the following formula (5):
F＝αVtotal+βLPCL-i+γt (5)
The constraint is represented by the following formula (6):
α+β+γ＝1 (6)
Wherein F is a performance quantization value of the fault current limiter and is used for representing the performance of the fault current limiter; v total denotes the volume of the fault current limiter; l PCL-i denotes the initial inductance of the fault current limiter; alpha is the weight of the volume; beta is the weight of the initial inductance; gamma is the weight of the movement duration of the moving part.
And 103, optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In this embodiment, an optimization algorithm such as a genetic algorithm may be used as a preset algorithm, and the preset algorithm is used to perform optimization processing on the objective function, so as to determine a value of the optimization parameter corresponding to the fault current limiter when the performance of the fault current limiter is optimal (i.e., the performance quantization value fhighest) as the target value of the optimization parameter. For example, the volume at which the performance quantization value is highest is determined as the target value of the volume of the fault current limiter; determining an initial inductance at the highest performance quantification value as a target value of the initial inductance of the fault current limiter; the movement time period when the performance quantification value is highest is determined as a target value of the movement time period of the moving part of the fault current limiter.
According to the fault current limiter disclosed by the embodiment of the application, when fault current occurs, the winding through which the fault current flows can generate magnetic force, the moving part is adsorbed to the fixed part under the action of the magnetic force, after the effect of reducing the fault current is achieved, the moving part can be reset through manual adjustment, and the distance between the moving part and the fixed part is recovered, so that the repeated utilization of the fault current limiter is realized, and the operation and maintenance cost of a power grid is greatly reduced. In addition, the embodiment of the application can optimize the parameters of the fault current limiter, so that the fault current limiter can be suitable for different environments, for example, when the voltage of a power transmission line is different or the temperature is different, the embodiment of the application can optimize the fault current limiter so as to optimize the performance of the fault current limiter. The embodiment of the application can optimize the fault current limiter from three aspects of volume, initial inductance and moving time of the moving part, improves the reactance of the fault current limiter during operation, and achieves the effect of improving the performance of the fault current limiter.
The foregoing embodiments describe a scheme for determining target values of optimization parameters of a fault current limiter using a preset algorithm. In another embodiment of the application, a genetic algorithm may be employed to determine the target value of the optimization parameter in the event that the performance quantification of the fault current limiter is satisfactory. Specifically, the method comprises the steps as shown in fig. 8:
And step 201, carrying out iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation.
And 202, ending the iterative operation if the performance quantization value meets the iteration ending condition, and determining a target value of the optimization parameter according to the performance quantization value when the iterative operation is ended.
The iteration ending condition may be that the performance quantization value is greater than a preset performance quantization threshold; the peak value of the performance quantization value may also appear in a preset iteration duration. Therefore, the performance quantization value at the end of the iterative operation may be a performance quantization value greater than a preset performance quantization threshold, or may be a peak value of the performance quantization value within a preset iteration duration.
In this embodiment, the terminal may perform iterative operation on the objective function based on the initial volume value, the initial inductance value and the initial value of the preset duration by using a genetic algorithm, so as to change the volume of the fault current limiter, the initial inductance and the movement duration of the moving component, thereby obtaining the performance quantization value of the fault current limiter corresponding to each iterative operation. And then the terminal can judge the performance quantization value corresponding to each iteration operation, and determine whether the performance quantization value meets the iteration ending condition. If the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining the value of the optimization parameter corresponding to the performance quantization value at the end of the iteration operation as the target value of the optimization parameter.
In another embodiment, determining the value of the optimization parameter corresponding to the performance quantization value at the end of the iterative operation as the target value of the optimization parameter may include the steps as shown in fig. 9:
Step 301, determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter;
step 302, determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter;
Step 303, determining a movement duration corresponding to the performance quantization value at the end of the iterative operation as a target movement duration of the moving component.
The target volume is the volume value of the fault current limiter after optimization, the target initial inductance is the initial inductance value of the fault current limiter after optimization, and the target moving duration is the moving duration of the moving component after optimization of the fault current limiter.
The embodiment of the application can optimize parameters of the fault current limiter, so that the fault current limiter can be suitable for different environments, for example, when the voltage of a power transmission line is different or the temperature is different, the embodiment of the application can optimize the fault current limiter from three aspects of volume, initial inductance and moving time of a moving part, and the reactance of the fault current limiter in operation is improved, so that the effect of improving the performance of the fault current limiter is achieved.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides an optimization device of the fault current limiter for realizing the optimization method of the fault current limiter. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the optimizing device for one or more fault current limiters provided below may be referred to the limitation of the optimizing method for a fault current limiter hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 10, there is provided an optimizing apparatus of a fault current limiter, comprising: the system comprises an optimization parameter determining module, an objective function determining module and an optimization processing module, wherein:
an optimization parameter determining module 401, configured to determine an optimization parameter of the fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
An objective function determining module 402, configured to determine an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
and the optimization processing module 403 is configured to perform optimization processing on the objective function by using a preset algorithm, and determine a target value of the optimization parameter.
In one embodiment, the optimization processing module 403 is specifically configured to perform iterative operation on the objective function by using a genetic algorithm, so as to obtain a performance quantization value corresponding to each iterative operation; and if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining a target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
In one embodiment, the optimization processing module 403 is further configured to determine a volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter; determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter; and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving part.
The respective modules in the above-described optimization device of the fault current limiter may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 11. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device 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 includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of optimizing a fault current limiter. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 11 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In one embodiment, the processor when executing the computer program further performs the steps of: carrying out iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation; and if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining a target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
In one embodiment, the processor when executing the computer program further performs the steps of: determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter; determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter; and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving part.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In one embodiment, the computer program when executed by the processor further performs the steps of: carrying out iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation; and if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining a target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter; determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter; and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving part.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
determining an optimization parameter of a fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, the initial inductance and the moving duration of the moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, the initial inductance and the moving duration of the moving part of the fault current limiter;
And optimizing the objective function by adopting a preset algorithm, and determining the target value of the optimized parameter.
In one embodiment, the computer program when executed by the processor further performs the steps of: carrying out iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation; and if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining a target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter; determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter; and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving part.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (11)
1. A method of optimizing a fault current limiter, applied to a fault current limiter, the method comprising:
Determining an optimization parameter of the fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, an initial inductance and a movement duration of a moving part in the fault current limiter;
Determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, initial inductance and moving duration of the moving component of the fault current limiter; the objective function is further configured to increase a speed at which the reactance of the fault current limiter increases by decreasing a movement time period for the moving member to move to the fixed member;
optimizing the objective function by adopting a preset algorithm, and determining a target value of the optimized parameter;
The objective function includes:
F＝αVtotal+βLPCL-i+γt
α+β+γ＝1
Wherein F is a performance quantization value of the fault current limiter and is used for representing the performance of the fault current limiter; v total denotes the volume of the fault current limiter; l PCL-i denotes the initial inductance of the fault current limiter; alpha is the weight of the volume; beta is the weight of the initial inductance; gamma is the weight of the movement duration of the moving part.
2. The method according to claim 1, wherein the optimizing the objective function using a preset algorithm to determine the target value of the optimization parameter includes:
Performing iterative operation on the objective function by adopting a genetic algorithm to obtain a performance quantization value corresponding to each iterative operation;
And if the performance quantization value meets the iteration ending condition, ending the iteration operation, and determining the target value of the optimization parameter according to the performance quantization value when the iteration operation is ended.
3. The method according to claim 2, wherein said determining the target value of the optimization parameter from the performance quantization value at the end of the iterative operation comprises at least one of:
Determining the volume corresponding to the performance quantization value at the end of the iterative operation as the target volume of the fault current limiter;
Determining an initial inductance corresponding to the performance quantization value at the end of the iterative operation as a target initial inductance of the fault current limiter;
and determining the movement time length corresponding to the performance quantization value at the end of the iterative operation as the target movement time length of the moving component.
4. A method according to any of claims 1-3, characterized in that the fault current limiter comprises: a fixed part, a moving part, and a winding; the fixed part and the movable part are spaced by a preset distance, and the winding is arranged on the fixed part;
And if the current on the winding meets the preset limiting condition, the magnetic force generated by the winding adsorbs the moving part to move towards the fixed part so as to reduce the current on the winding.
5. The method of claim 4, wherein the predetermined limit comprises at least one of an increment greater than a predetermined increment threshold and a current value greater than a predetermined current value for a predetermined duration.
6. The method of claim 4, wherein the fault current limiter further comprises an elastic component; the elastic component is arranged between the movable component and the fixed component.
7. The method of claim 4, wherein the fault current limiter further comprises a resistor; the resistor is connected in series with the winding.
8. An optimization apparatus for a fault current limiter, the apparatus comprising:
an optimization parameter determining module, configured to determine an optimization parameter of the fault current limiter; the optimization parameters comprise at least one of the volume of the fault current limiter, an initial inductance and a movement duration of a moving part in the fault current limiter;
The objective function determining module is used for determining an objective function according to the optimization parameters; the objective function is used for representing the relation between the performance quantification value of the fault current limiter and the volume, initial inductance and moving duration of the moving component of the fault current limiter; the objective function is further configured to increase a speed at which the reactance of the fault current limiter increases by decreasing a movement time period for the moving member to move to the fixed member;
the optimization processing module is used for optimizing the objective function by adopting a preset algorithm and determining a target value of the optimization parameter;
The objective function includes:
F＝αVtotal+βLPCL-i+γt
α+β+γ＝1
Wherein F is a performance quantization value of the fault current limiter and is used for representing the performance of the fault current limiter; v total denotes the volume of the fault current limiter; l PCL-i denotes the initial inductance of the fault current limiter; alpha is the weight of the volume; beta is the weight of the initial inductance; gamma is the weight of the movement duration of the moving part.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
11. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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