CN117973097A - Method for acquiring resistance interval corresponding to starting fixed value under arc suppression coil grounding system - Google Patents
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Abstract
The invention discloses a method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which relates to the technical field of distribution network fault identification, and comprises the following steps: establishing a first representation relation of zero sequence voltage in the power distribution system, and constructing a second representation relation of a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first representation relation; the bridge connecting the starting fixed value of the zero sequence voltage and the adaptive fault resistor is built, the traditional setting of the fixed value is not dependable, in addition, the mathematical relationship between the starting fixed value and the adaptive fault resistor is quantized by adopting an analytical characterization mode for the first time, the protection parameter setting including the starting fixed value can be clearly guided to be produced, the starting capability of the fault line selection protection device including a secondary fusion set is reliably improved, the rapid and effective identification of the single-phase ground fault is effectively and sensitively realized, the rapid starting of the ground fault research and judgment function is reliably realized, and the serious life and property loss which is larger in scope and difficult to recover is avoided.
Description
Technical Field
The invention relates to the technical field of distribution network fault identification, in particular to a method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system.
Background
The current single-phase grounding line selection technology has made great progress, but a larger gap exists for the mountain fire prevention protection, especially in the aspects of adaptability to high resistance, detection capability to transient faults, rapidity of protection judgment and the like, so that the algorithm needs to be optimized, and the adaptability of a mountain fire prevention scene is improved as much as possible; in addition, the protection trip driving method by utilizing the single-phase grounding line selection has no current experience for reference and needs to develop exploratory research. The single-phase grounding line selection algorithm is divided into a starting algorithm and a fault studying and judging algorithm; the starting algorithm is a first gate for distinguishing normal state and fault state of the power grid and is used for waking up the protection device and starting a fault studying and judging program, so that the starting algorithm is important for identifying high resistance. At present, for an arc suppression coil grounding system, the starting fixed value of the traditional wake-up protection device mostly adopts the maximum system unbalance degree under the working condition, the reference network distribution operation rule is generally not more than 15%, the change of the working condition of the system under the along-regulation and pre-regulation arc suppression system cannot be considered, and the mode of 'one-cut' is adopted to be obviously rough.
Disclosure of Invention
The invention aims to provide a method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which can quantitatively describe the relation between the starting fixed value of zero sequence voltage under the arc suppression coil grounding system and the upper limit and the lower limit of a high-resistance grounding fault which is adaptive to the starting fixed value, clearly presets the high-resistance fault which can be matched with the starting fixed value at the highest degree, and makes up the production and application problems that the current setting of the starting fixed value is mostly qualitative setting but does not have large-area popularization.
The technical aim of the invention is realized by the following technical scheme:
In a first aspect, the present application provides a method for acquiring a resistance interval corresponding to a start fixed value under an arc suppression coil grounding system, including the following specific steps:
Establishing a first representation relation of zero sequence voltage in a power distribution system, wherein the first representation relation is specifically as follows:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols;
Constructing a second characterization relation of a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, wherein the second characterization relation is specifically as follows:
Wherein/> ；
In the method, in the process of the invention,A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
The beneficial effects of the invention are as follows: in the scheme, aiming at the mathematical relation between the characteristic zero sequence voltage starting fixed value and the reliable starting fault transition resistance interval of the arc suppression coil grounding system, the multi-junction production operation experience is often set when the starting fixed value is set on site, namely, the operation experience that the unbalance degree of the system under the arc suppression coil grounding system is not more than 15% is considered, the change of the unbalance degree of the system under the action of the adjustable and preset arc suppression coils cannot be considered, the starting fixed value is easily caused to be too high, the reliable starting is not carried out on the high-resistance grounding fault, the optimal opportunity of the disposal of the fault is finally easily caused, and the important life and property loss which is in a larger range and is difficult to save is caused; the relation between the zero sequence voltage starting fixed value and the upper limit and the lower limit of the high-resistance grounding fault adapted to the zero sequence voltage starting fixed value under the arc suppression coil grounding system is quantitatively described through the established relation, so that the mathematical boundary between the zero sequence voltage starting fixed value and the highest fault resistance identification capability adapted to the zero sequence voltage starting fixed value is defined, the reasonable starting fixed value is set for a production line, the starting capability of the protection device is reliably improved, and the quick and effective identification of the single-phase grounding fault is effectively and sensitively realized.
In the scheme, a bridge between a starting fixed value of the connected zero sequence voltage and a fault resistance adapting to the fixed value is built, the traditional fixed value setting is not dependent, and the potential of the fault line selection protection device cannot be exerted due to the fact that the fixed value is too high only by avoiding common rule constraint conditions of a distribution network that the zero sequence voltage of a system under an arc suppression coil grounding system is not more than 15%; in addition, the mathematical relationship between the two is quantized by adopting a analytic characterization mode for the first time, the protection parameter setting including the production setting starting fixed value can be clearly guided, the starting capability of the fault line selection protection device which is integrated into a whole for the second time is reliably improved, the rapid and effective identification of the single-phase ground fault is efficiently and sensitively realized, the rapid starting of the ground fault judging function is reliably realized, and the serious life and property loss which is in a larger range and is difficult to recover is avoided.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the degree of detuning is specifically:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the arc suppression coil inductance parameter.
Further, the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
Further, the damping rate under the above-mentioned failure is specifically:
；
in the method, in the process of the invention, Representing the damping rate under failure,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the inverse of the fault resistance,/>Representing fault resistance,/>Representing capacitive reactance,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Indicating the maximum current capacity of the distribution system in the event of a metallic ground fault.
Further, the starting constant value satisfies a first constraint condition, where the first constraint condition is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Represents the start-up constant value of zero sequence voltage,/>Representing the damping rate under failure,/>Representing the sign of the imaginary part,/>Indicating the degree of detuning.
In a second aspect, the present application provides a system for acquiring a resistance interval corresponding to a start fixed value under an arc suppression coil grounding system, which is applied to a method for acquiring a resistance interval corresponding to a start fixed value under an arc suppression coil grounding system in any one of the first aspects, and includes:
The first module is used for establishing a first representation relation of zero sequence voltage in the power distribution system, and the first representation relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols;
the second module is used for constructing a second characterization relation between a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, and the second characterization relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
Further, in the first module or the second module, the degree of detuning is specifically:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the arc suppression coil inductance parameter.
Further, in the first module, the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
In a third aspect, the application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of the first aspects when executing the computer program.
In a fourth aspect, the present application provides a non-transitory computer readable storage medium storing computer instructions that cause a computer to perform the method of any one of the first aspects.
Compared with the prior art, the invention has at least the following beneficial effects:
Aiming at the current mathematical relation between the characteristic zero sequence voltage starting fixed value and the reliable starting fault transition resistance interval of the arc suppression coil grounding system, the application usually causes the on-site setting of the starting fixed value to be set according to the multi-junction production operation experience, namely, the operation experience that the unbalance degree of the system under the arc suppression coil grounding system is not more than 15 percent is considered, the change of the unbalance degree of the system under the action of the along-with-regulation and pre-regulation arc suppression coils cannot be considered, the starting fixed value is easily caused to be too high, the reliable starting is not carried out on the high-resistance grounding fault, the optimal opportunity for the disposal of the fault is finally easily caused, and the important life and property loss which is in a larger range and is difficult to save is caused; the relation between the zero sequence voltage starting fixed value and the upper limit and the lower limit of the high-resistance grounding fault adapted to the zero sequence voltage starting fixed value under the arc suppression coil grounding system is quantitatively described through the established relation, so that the mathematical boundary between the zero sequence voltage starting fixed value and the highest fault resistance identification capability adapted to the zero sequence voltage starting fixed value is defined, the reasonable starting fixed value is set for a production line, the starting capability of the protection device is reliably improved, and the quick and effective identification of the single-phase grounding fault is effectively and sensitively realized.
According to the application, a bridge connecting the starting fixed value of the zero sequence voltage and the adaptive fault resistance is built, the conventional fixed value setting is closed, and the potential of the fault line selection protection device cannot be exerted due to the fact that the fixed value is too high only by avoiding common regulation constraint conditions of a distribution network in which the zero sequence voltage of a system under an arc suppression coil grounding system is not more than 15%; in addition, the mathematical relationship between the two is quantized by adopting a analytic characterization mode for the first time, the protection parameter setting including the production setting starting fixed value can be clearly guided, the starting capability of the fault line selection protection device which is integrated into a whole for the second time is reliably improved, the rapid and effective identification of the single-phase ground fault is efficiently and sensitively realized, the rapid starting of the ground fault judging function is reliably realized, and the serious life and property loss which is in a larger range and is difficult to recover is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a graph showing upper and lower limits of the zero sequence voltage variation of the system under different detuning degrees by arc suppression coil compensation provided in the embodiment of the present invention;
FIG. 2 is a graph showing the zero sequence voltage starting high resistance capability under arc suppression coil compensation in an embodiment of the present invention;
Fig. 3 shows that the detuning degree v= -0.1 after the arc suppression coil compensation is the upper limit of the reliable start fault transition resistance in the embodiment of the present invention;
Fig. 4 shows that the detuning degree v= -0.2 after the arc suppression coil compensation is the upper limit of the reliable start fault transition resistance in the embodiment of the present invention;
FIG. 5 is a logarithmic change curve of the zero sequence voltage amplitude, zero sequence voltage amplitude abrupt change and zero sequence voltage phasor abrupt change under a large scale after arc suppression coil compensation and following the fault damping rate change in the embodiment of the invention;
fig. 6 is a logarithmic change curve of the zero-sequence voltage amplitude, the zero-sequence voltage amplitude abrupt change and the zero-sequence voltage phasor abrupt change under a small scale after arc suppression coil compensation and following the fault damping rate change in the embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, "plurality" means at least 2.
Example 1: the embodiment provides a method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which comprises the following two parts: firstly, constructing a mathematical representation relation of zero sequence voltage under an arc suppression coil system; secondly, a mathematical representation relation between the quantized zero sequence voltage starting fixed value and the adaptive fault resistance is provided.
The method comprises the following steps of constructing a mathematical representation relation of zero sequence voltage under an arc suppression coil system, wherein the construction of the relation comprises the following specific steps:
S1, combining with the attached figure 1, adopting kirchhoff' S law, a mathematical relation of neutral point displacement voltage in a power distribution system can be constructed, as follows:
；
in the method, in the process of the invention, : When the neutral point is not grounded, the neutral point residual voltage is determined by the three relative ground natural admittances of the power distribution system; /(I): Neutral point displacement voltage, equal to/>, in neutral point uncompensated and fault-free state；/>: Asymmetric current, no arc suppression coil compensation, and current flowing through the neutral point directly to the ground; /(I): An asymmetry degree; /(I): Capacitive current, single-phase metallic ground current under the action of the ground-free system capacitance to ground.
S2, according to S1, and under the premise of neglecting the conductance to the ground, namely、/>AndIt can be developed into the following form:
；
s3, redefining the harmony measures according to the S2: degree of detuning: /(I) It can be further converted into the following form:
Further, if it is omitted as well （/>Is a relative ground conductance and can be considered as three phases being equal. ) And/>(Arc suppression coil conductance) there are:
。
Therefore, the zero sequence voltage and the single-phase earth fault impedance have a good approximate monotone relation, the principle is simple, the calculation is easy, and the method is quite easy to obtain in engineering, so that the starting fixed value of the single-phase earth fault line selection in practical application is always the zero sequence voltage of the preferred system. It can be found by combining the above formulas: the significant difference from an ungrounded system is that in this case the zero sequence voltage of the system is multiplied by the tuning compensation of the suppression coil, assuming that the suppression coil is arranged according to a typical overcompensation of 10%, the detuning is achieved in the absence of faults And the zero sequence voltage of the system is amplified to be 10 times of the asymmetry degree under the condition of no faults and can reach the level of 20% -30%. The closer the arc suppression coil is to full compensation, the larger the zero sequence voltage is amplified, and even in a fault-free state, a high steady-state voltage remains at the neutral point. The relevant standard therefore specifies that the detuning of the choke compensation is higher than 10% and that the steady-state operating voltage of the neutral point of the choke-compensated system is not higher than 15% of the phase voltage.
In particular, the single-phase grounding line selection device is only used as an auxiliary means for searching a fault line for a long time, is generally not used as a protection trip, and does not have the requirement of specially protecting the fixed value setting on site, so that the line selection device actually operates by adopting a factory fixed value. Some devices are designed to stabilize the performance and even to cure the device at a certain value. In order to be applicable to all scenes, manufacturers generally set the starting value of the grounding line selection higher according to common practice, and the basis is to avoid the normal operation neutral point voltage of the small arc ring compensation system. Therefore, the zero voltage starting fixed value of the single-line selection equipment in factory delivery is generally set to be 20% -30% of the phase voltage. Obviously too coarse, the requirement of high-resistance ground fault identification cannot be met, and the potential of the protection function of the line selection device cannot be exerted due to the setting of an excessively high fixed value.
Further, the mathematical representation relation between the zero sequence voltage starting fixed value and the fault resistance adapted to the zero sequence voltage starting fixed value is quantized. The establishment of the relation comprises three steps, namely:
s1, supposing that the protection starting set value is set Ground fault/>, which can be activatedThe range of (2) satisfies:
in the method, in the process of the invention, For asymmetry of system in normal operation,/>；/>Is the damping rate under fault and its value is/>; And variable/>The fixed value threshold is started for the set zero sequence voltage, and according to the traditional experience, the fixed value needs to avoid the initial system asymmetry when the system normally operates.
S2, degree of asymmetryIs a phasor whose direction is determined by the mutual magnitude relationship of the three-phase capacitances to ground, which is clearly different for different power distribution systems. The theoretical maximum value and the theoretical minimum value of the zero sequence voltage of the system under the fault can be obtained by considering that the angles of the direction and the fault damping rate direction are the same or opposite, and the theoretical maximum value and the theoretical minimum value are respectively as follows: /(I)And/>。
S3, for the above formula, defineAnd physical implications in combination with failure damping rateThe formula in S1 can be simplified to the following form:
in the method, in the process of the invention, An a-phase voltage among the three-phase voltages; /(I)Maximum capacity flow under metallic ground fault occurs for the distribution network; starting a fixed value threshold for the set zero sequence voltage; /(I) 、/>Respectively, systematic asymmetry phasors/>Of (2), wherein。
According to the relation, the adaptability curves of the zero voltage starting algorithm to the fault transition resistance under the typical asymmetry are listed as shown in figures 1-6, wherein figure 1 is an upper limit curve and a lower limit curve of the zero sequence voltage change of the system under different detuning degrees under the compensation of the arc suppression coil; the method is expressed as an upper limit range and a lower limit range of a starting criterion theory constructed by a zero sequence voltage threshold under different detuning degrees, namely the upper limit range and the lower limit range account for the percentage of the system phase voltage; FIG. 2 is a graph of zero sequence voltage start high resistance capability under arc suppression coil compensation; the method is expressed as a starting threshold of the system zero sequence voltage under different fault resistances, namely under the fault damping rate, and the theoretical upper and lower floating ranges of the system zero sequence voltage exist; fig. 3 shows the upper limit of the reliable start fault transition resistance when the detuning degree v= -0.1 after arc suppression coil compensation; when the system detuning degree is-10%, setting fault resistance upper limits of reliable starting of zero sequence voltages of different thresholds; fig. 4 is an upper limit of reliable start fault transition resistance when detuning v= -0.2 after arc suppression coil compensation; when the system detuning degree is-20%, setting fault resistance upper limits of reliable starting of zero sequence voltages of different thresholds; FIG. 5 is a logarithmic change curve of zero sequence voltage amplitude, zero sequence voltage amplitude abrupt change and zero sequence voltage phasor abrupt change under a large scale after arc suppression coil compensation and following the fault damping rate change; the method is characterized in that the performance advantages and disadvantages of three different starting thresholds are distinguished and compared, the percentage of the three thresholds to the phase voltage under the condition that the abscissa is taken as the fault damping rate is represented, and the larger the value is, the more excellent the starting performance is indicated; fig. 6 is a logarithmic change curve of zero-sequence voltage amplitude, zero-sequence voltage amplitude abrupt change and zero-sequence voltage phasor abrupt change under a small scale after arc suppression coil compensation and following the fault damping rate. On the basis of the graph expressed as FIG. 5, the performance difference of three starting thresholds of the vehicle under the logarithmic coordinates of the fault damping rate of 0.001-0.1 is amplified, so that visual observation is facilitated; the higher the balance degree of the system is, the smaller the asymmetry degree is, and the higher the transition resistance which is tolerated by the zero voltage starting algorithm is; the constant value that can reliably start under typical asymmetry is generally between 5 and 10kΩ, and can be partially started. The smaller the asymmetry, the higher the fault impedance upper limit of reliable starting is, while the fault impedance upper limit of partial starting is reduced, and the difference between the two is reduced along with the increase of the starting fixed value.
Example 2: the embodiment of the application provides a method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which comprises the following specific steps:
Establishing a first representation relation of zero sequence voltage in a power distribution system, wherein the first representation relation is specifically as follows:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols.
Optionally, the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
Optionally, the damping rate under the fault is specifically:
；
in the method, in the process of the invention, Representing the damping rate under failure,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the inverse of the fault resistance,/>Representing fault resistance,/>Representing capacitive reactance,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Indicating the maximum current capacity of the distribution system in the event of a metallic ground fault.
Constructing a second characterization relation of a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, wherein the second characterization relation is specifically as follows:
Wherein/> ；
In the method, in the process of the invention,A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
Optionally, the foregoing degree of detuning is specifically:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the arc suppression coil inductance parameter.
Optionally, the starting constant value meets a first constraint condition, where the first constraint condition is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Represents the start-up constant value of zero sequence voltage,/>Representing the damping rate under failure,/>Representing the sign of the imaginary part,/>Indicating the degree of detuning.
Examples
The embodiment of the application provides a system for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which is applied to the method for acquiring the resistance interval corresponding to the starting fixed value under the arc suppression coil grounding system in any one of embodiment 2, and comprises the following steps:
The first module is used for establishing a first representation relation of zero sequence voltage in the power distribution system, and the first representation relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols.
Optionally, in the first module, the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
The second module is used for constructing a second characterization relation between a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, and the second characterization relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
Optionally, in the first module or the second module, the degree of detuning is specifically:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the arc suppression coil inductance parameter.
Example 4: an embodiment of the present application provides an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method of any of embodiment 2 when executing the computer program.
Example 5: embodiments of the present application provide a non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any of embodiment 3.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, and it should be understood that the foregoing is by way of illustration and example only, and is not intended to limit the scope of the invention.
Claims (10)
1. The method for acquiring the resistance interval corresponding to the starting fixed value under the arc suppression coil grounding system is characterized by comprising the following specific steps:
Establishing a first representation relation of zero sequence voltage in a power distribution system, wherein the first representation relation specifically comprises the following steps:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols;
Constructing a second characterization relation of a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, wherein the second characterization relation specifically comprises the following steps:
Wherein/> ；
In the method, in the process of the invention,A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
2. The method for acquiring the resistance interval corresponding to the starting fixed value under the arc suppression coil grounding system according to claim 1, wherein the detuning degree is specifically as follows:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>，/>Representing the arc suppression coil inductance parameter.
3. The method for acquiring the resistance interval corresponding to the starting fixed value under the arc suppression coil grounding system according to claim 1, wherein the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
4. The method for acquiring the resistance interval corresponding to the starting fixed value under the arc suppression coil grounding system according to claim 1, wherein the damping rate under the fault is specifically:
；
in the method, in the process of the invention, Representing the damping rate under failure,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>A capacitance to ground parameter representing the C-phase voltage of the three-phase voltages,，/>Representing the inverse of the fault resistance,/>Representing fault resistance,/>Representing capacitive reactance,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Indicating the maximum current capacity of the distribution system in the event of a metallic ground fault.
5. The method for acquiring the resistance interval corresponding to the starting constant value under the arc suppression coil grounding system according to claim 1, wherein the starting constant value meets a first constraint condition, and the first constraint condition is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A-phase voltage representing three-phase voltage in a power distribution system,/>Represents the start-up constant value of zero sequence voltage,/>Representing the damping rate under failure,/>Representing the sign of the imaginary part,/>Indicating the degree of detuning.
6. The system for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system, which is applied to the method for acquiring a resistance interval corresponding to a starting fixed value under an arc suppression coil grounding system according to any one of claims 1 to 5, is characterized by comprising the following steps:
the first module is used for establishing a first representation relation of zero sequence voltage in the power distribution system, and the first representation relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing asymmetry during normal operation of a power distribution system,/>Representing the damping rate under failure,/>Representing the degree of separation,/>Representing zero sequence voltage,/>Representing the imaginary symbols;
the second module is used for constructing a second characterization relation between a starting fixed value and a fault resistance adapted to the starting fixed value in the power distribution system through the first characterization relation, and the second characterization relation is specifically:
；
in the method, in the process of the invention, A-phase voltage representing three-phase voltage in a power distribution system,/>Representing fault resistance,/>Representing the real part of the asymmetry,/>Imaginary part representing asymmetry,/>Representing maximum current capacity of power distribution system under metallic ground faultRepresenting the degree of separation,/>Representing the start-up constant of the zero sequence voltage.
7. The system for acquiring a resistance interval corresponding to a starting constant value under an arc suppression coil grounding system according to claim 6, wherein in the first module or the second module, the degree of detuning is specifically:
；
in the method, in the process of the invention, Representing the degree of separation,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>，/>Representing the arc suppression coil inductance parameter.
8. The system for acquiring a resistance interval corresponding to a starting constant value under an arc suppression coil grounding system according to claim 6, wherein in the first module, the asymmetry is specifically:
；
in the method, in the process of the invention, Representing asymmetry during normal operation of a power distribution system,/>A/V represents the capacitance to ground parameter of the A-phase voltage in the three-phase voltageCapacitance to ground parameter representing B-phase voltage in three-phase voltage,/>Capacitance to ground parameter representing C-phase voltage in three-phase voltage,/>Representing an operator, the value is/>Wherein/>Representing the imaginary symbols.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1-5 when the computer program is executed by the processor.
10. A non-transitory computer readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1-5.
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