CN118011099A - Interval zero sequence impedance parameter calculation circuit, method, storage medium and terminal - Google Patents
Interval zero sequence impedance parameter calculation circuit, method, storage medium and terminal Download PDFInfo
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Abstract
The embodiment of the invention discloses a section zero sequence impedance parameter calculation circuit, a method, a storage medium and a terminal, wherein the circuit comprises a three-phase power supply, a plurality of line sections, a three-phase power supply and a single-phase grounding device, wherein the three-phase power supply is used for providing current, and any outgoing line side connected with the three-phase power supply is arranged for raising the voltage amplitude of a neutral point to a preset value; and the circuit intervals are used for receiving the current under the preset value condition and acquiring zero sequence impedance parameters of the circuit intervals through the current. By setting any outgoing line side single-phase grounding connected with a three-phase power supply, the neutral point voltage amplitude is increased to a preset value, under the condition of the preset value, zero sequence impedance parameters of each line interval are obtained through calculation, accurate measurement of the power distribution network line to the ground parameters is realized, and accurate line parameters and topology information are provided for real-time setting of a power grid protection fixed value and real-time power flow calculation.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a section zero sequence impedance parameter calculation circuit, a section zero sequence impedance parameter calculation method, a storage medium and a terminal.
Background
For the national energy transformation and 'double carbon' targets, a large amount of distributed new energy and multiple loads are connected into a power grid, the power grid is required to realize multidirectional cooperation and flexible interaction, the traditional power grid has the problems of transparency and insufficient digitization, and particularly, the power distribution network has a complex structure and various devices, and the transparent power grid topology and electrical and physical parameters are urgently required to realize the digital twin power grid in a real sense.
In the prior art, the current technical means only can obtain the overall ground impedance of all outgoing lines of the whole bus section, an online measurement method is not available at present, the test can be performed only by a power failure and high voltage method, and the implementation is difficult under the current requirements of power supply reliability and the like.
Disclosure of Invention
Based on this, it is necessary to provide a section zero sequence impedance parameter calculation circuit, method, storage medium and terminal for the above problems.
An interval zero sequence impedance parameter calculation circuit comprises a three-phase power supply and a plurality of line intervals,
The three-phase power supply is used for providing current, and is provided with any outlet line side single-phase grounding connected with the three-phase power supply and used for raising the voltage amplitude of a neutral point to a preset value;
And the circuit intervals are used for receiving the current under the preset value condition and acquiring zero sequence impedance parameters of the circuit intervals through the current.
Wherein the plurality of line intervals comprise line measuring points and three-phase circuit impedance,
The line measuring point is used for receiving the current flowing into the current line interval under the preset value condition, and acquiring the zero sequence voltage and the zero sequence current of the current line interval through the current.
And the three-phase circuit impedance is used for determining the zero-sequence impedance parameter of the current three-phase circuit impedance through the zero-sequence voltage and the zero-sequence current of the current line interval.
A method for calculating interval zero sequence impedance parameters, the method comprising:
providing current, setting any outlet line side single-phase grounding connected with the three-phase power supply, and increasing the voltage amplitude of the neutral point to a preset value.
And under the preset value condition, receiving the current, and acquiring zero sequence impedance parameters of the plurality of line intervals through the current.
Receiving the current under the preset value condition, and acquiring zero sequence impedance parameters of the plurality of line intervals through the current, wherein the method specifically comprises the following steps of:
and under the preset value condition, acquiring the zero sequence voltage and zero sequence current of the bus outgoing positions of all outgoing lines and the line intervals respectively through the current.
And determining zero-sequence impedance parameters of the three-phase circuit impedance between the bus outgoing position of the non-single-phase grounding line in each outgoing line and the first line measuring point under the preset value condition according to the zero-sequence voltage and zero-sequence current of the bus outgoing position of each outgoing line and the line intervals.
And respectively determining zero sequence impedance parameters of the three-phase circuit impedance between adjacent line measurement points of the non-single-phase grounding line in each outgoing line under the preset value condition according to the bus outgoing line of each outgoing line and the zero sequence voltages and the zero sequence currents of the line intervals.
And respectively determining zero-sequence impedance parameters of the three-phase circuit impedance in the line intervals of the tail ends of the non-single-phase grounding lines in each outgoing line under the preset value condition according to the bus outgoing positions of the outgoing lines and the zero-sequence voltages and the zero-sequence currents of the line intervals.
Setting the single-phase grounding of the other outgoing line side, and repeating the steps until the zero sequence impedance parameters of the plurality of line intervals under the single-phase grounding condition of all the outgoing line sides are obtained.
The determining, according to the zero sequence voltages and zero sequence currents at the bus outgoing positions of the outgoing lines and among the line intervals, the zero sequence impedance parameters of the three-phase circuit impedance between the bus outgoing positions of the non-single-phase grounding lines and the first line measuring point in the outgoing lines under the preset value condition includes:
And respectively determining the average value of the zero sequence voltage amplitude between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point according to the bus outgoing line position of each outgoing line and the zero sequence voltage and the zero sequence current among the line intervals.
And respectively determining absolute values of zero sequence current amplitude differences between the bus outgoing positions of the non-single-phase grounding lines in the outgoing lines and the first line measuring points according to the zero sequence voltages and the zero sequence currents of the bus outgoing positions of the outgoing lines and the line intervals.
And respectively determining zero sequence impedance parameters of three-phase circuit impedance between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the line measuring point under the condition of the preset value according to the zero sequence voltage amplitude average value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point and the absolute value of the zero sequence current amplitude difference value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point.
The method specifically includes the steps of respectively determining zero sequence impedance parameters of three-phase circuit impedance between a bus outgoing line position of a non-single-phase grounding line in each outgoing line and a first line measurement point under the preset value condition according to an average value of zero sequence voltage amplitude between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measurement point and an absolute value of zero sequence current amplitude difference between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measurement point, wherein the zero sequence impedance parameters specifically include:
According to Determining zero sequence impedance parameters of three-phase circuit impedance at a bus outlet of a non-single-phase grounding line and between a first line in each outgoing line, wherein U 0n is zero sequence voltage at the bus outlet of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the first line measurement point of the non-single-phase ground line in each outgoing line,For the zero sequence current of the first line measuring point of the non-single-phase grounding line in each outgoing line, I 0n is the zero sequence current of the bus outgoing line of the non-single-phase grounding line in each outgoing line, and n is the outgoing line number.
The method specifically includes the steps of determining zero sequence impedance parameters of the three-phase circuit impedance between adjacent line measurement points of non-single-phase grounding lines in each outgoing line under the preset value condition according to the bus outgoing line of each outgoing line and the zero sequence voltages and zero sequence currents of the line intervals, wherein the zero sequence impedance parameters comprise:
And respectively determining the zero sequence voltage amplitude average value between adjacent line measurement points of the non-single-phase grounding line in each outgoing line according to the bus outgoing line of each outgoing line and the zero sequence voltages and zero sequence currents among the line intervals.
And respectively determining absolute values of zero sequence current amplitude differences between adjacent line measurement points of non-single-phase grounding lines in each outgoing line according to the outgoing line of each outgoing line bus and the zero sequence voltages and zero sequence currents among the line intervals.
And respectively determining zero sequence impedance parameters of three-phase circuit impedance between adjacent line measurement points of non-single-phase grounding lines in each outgoing line under the preset value condition according to the zero sequence voltage amplitude average value between the adjacent line measurement points and the absolute value of the zero sequence current amplitude difference value between the adjacent line measurement points.
The method specifically includes the steps of respectively determining zero sequence impedance parameters of three-phase circuit impedance between adjacent line measurement points of a non-single-phase grounding line in each outgoing line under the preset value condition according to an average value of zero sequence voltage amplitude between the adjacent line measurement points and an absolute value of zero sequence current amplitude difference between the adjacent line measurement points:
According to Determining zero sequence impedance parameters of three-phase circuit impedance of adjacent circuit measurement points of non-single-phase grounding circuits in all outgoing lines, wherein i is the number of circuit measurement points, i is more than or equal to 2,/>For the zero sequence voltage of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the line measuring point in the subsequent line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence current of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>And (3) the zero sequence current of a line measuring point in a subsequent line interval of a non-single-phase grounding line in each outgoing line, wherein n is the number of the outgoing line.
The method specifically includes the steps of determining zero sequence impedance parameters of the three-phase circuit impedance in the line section of the tail end of the non-single-phase grounding line in each outgoing line under the preset value condition according to the zero sequence voltage and the zero sequence current of the bus outgoing line of each outgoing line and the line sections, wherein the zero sequence impedance parameters specifically include:
And respectively determining the zero sequence voltage of the line interval of the tail end of the non-single-phase grounding line in each outgoing line according to the bus outgoing position of each outgoing line and the zero sequence voltages and the zero sequence currents of the line intervals.
And respectively determining the zero sequence current of the line section at the tail end of the non-single-phase grounding line in each outgoing line according to the bus outgoing position of each outgoing line and the zero sequence voltages and the zero sequence currents of the line sections.
And respectively determining zero-sequence impedance parameters of the three-phase circuit impedance in the line interval of the tail end of each outgoing line under the preset value condition according to the zero-sequence voltage of the line interval of the tail end of each outgoing line and the zero-sequence current of the line interval of the tail end of the non-single-phase grounding line in each outgoing line.
The determining, according to the zero sequence voltage of the line section at the tail end of each outgoing line and the zero sequence current of the line section at the tail end of a non-single-phase grounding line in each outgoing line, the zero sequence impedance parameter of the three-phase circuit impedance in the line section at the tail end of each outgoing line under the preset value condition specifically includes:
According to Respectively determining zero sequence impedance parameters of three-phase circuit impedance in a line interval of the tail end of the non-single-phase grounding line in each outgoing line under the preset value condition, wherein Z endX is the zero sequence impedance parameter of the three-phase circuit impedance in the line interval of the tail end of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the line interval of the non-single-phase grounding line end in each outgoing line,/>And (3) the zero sequence current of the line interval at the tail end of the non-single-phase grounding line in each outgoing line, and n is the number of the outgoing line.
A storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the method as described above.
A terminal comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the method as described above.
The embodiment of the invention has the following beneficial effects:
According to the invention, by setting any outgoing line side single-phase grounding connected with a three-phase power supply, the neutral point voltage amplitude is increased to a preset value, under the condition of the preset value, zero sequence impedance parameters of each line interval are obtained through calculation, accurate measurement of the ground parameters of the power distribution network line is realized, accurate line parameters and topology information are provided for real-time setting of a power grid protection fixed value and real-time tide calculation, and the power grid planning, scheduling, operation control, source network load storage interaction and other applications are supported, so that the construction of a novel power system is assisted.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic diagram of an embodiment of a block zero sequence impedance parameter calculation circuit according to the present invention;
FIG. 2 is a schematic diagram of a circuit section according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of the interval zero-sequence impedance parameter calculation circuit provided by the present invention;
FIG. 4 is a flowchart illustrating an embodiment of a method for calculating a zero-sequence impedance parameter of a section according to the present invention;
FIG. 5 is a flowchart of another embodiment of the interval zero-sequence impedance parameter calculation method provided by the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of a terminal provided by the present invention;
fig. 7 is a schematic structural diagram of an embodiment of a storage medium according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a interval zero-sequence impedance parameter calculation circuit provided by the present invention. A calculation circuit for interval zero sequence impedance parameters comprises a three-phase power supply and a plurality of line intervals,
The three-phase power supply is used for providing current, and any outlet line side single-phase grounding connected with the three-phase power supply is arranged for raising the voltage amplitude of the neutral point to a preset value.
In a specific implementation scenario, the three-phase power supply 1 includes an a-phase power supply, a B-phase power supply, and a C-phase power supply, is connected to the three-phase bus side, and provides current to a plurality of line sections 2 of the a-phase, B-phase, and C-phase lines through the three-phase power supply, and sets a single-phase ground on any outgoing line side connected to the three-phase power supply, so as to raise the voltage amplitude of the neutral point to a preset value, where the preset value is limited to 15% -100% of the rated phase voltage amplitude of the system, and measures zero-sequence voltage and zero-sequence current at the outgoing line outlet of each outgoing line and zero-sequence voltage and zero-sequence current of a plurality of line sections 2 through a bus outgoing switch (not shown) and line measurement points located in each line section. When the zero-sequence current in the same direction flows in the three-phase circuit, the circuit generates zero-sequence impedance, and the zero-sequence impedance parameters of a plurality of line intervals 2 are obtained under the condition of a preset value.
It should be noted that the present invention can set the phase a single-phase grounding or the phase B single-phase grounding or the phase C single-phase grounding at any position where the line appears.
And the circuit sections 2 are used for receiving current under the condition of a preset value, and acquiring zero sequence impedance parameters of the circuit sections 2 through the current.
In a specific implementation scenario, the three-phase power supply 1 supplies current to several line intervals 2 of each outgoing line. Specifically, the line interval zero sequence parameter calculation circuit has n outgoing lines, a line interval 21 is connected to a bus outgoing line position of the outgoing line 1, a line interval 22 is connected to a bus outgoing line position of the outgoing line 2, and a line interval 2n is connected to a bus outgoing line position of the outgoing line n. And the line intervals respectively receive the current, and the zero sequence impedance parameters of the current line interval are obtained through the current.
Preferably, each line interval comprises a line measurement point and a three-phase circuit impedance. Under the condition of a preset value, the line measuring point receives the measuring current flowing into the current line interval, the zero-sequence voltage and the zero-sequence current of the current line interval are obtained through the measuring current, and the zero-sequence impedance parameter of the current three-phase circuit impedance is determined through the zero-sequence voltage and the zero-sequence current of the current line interval.
According to the invention, by setting any outgoing line side single-phase grounding connected with a three-phase power supply, the neutral point voltage amplitude is increased to a preset value, under the condition of the preset value, zero sequence impedance parameters of each line interval are obtained through calculation, accurate measurement of the power distribution network line to the ground parameters is realized, accurate line parameters and topology information are provided for real-time setting of a power grid protection fixed value and real-time tide calculation, and the novel power system construction is assisted by supporting the power grid planning, scheduling, operation control, source network load storage interaction and other applications.
Fig. 2 is a schematic structural diagram of an embodiment of a plurality of line intervals according to the present invention. The circuit interval zero sequence parameter calculation circuit comprises a plurality of circuit intervals 2, wherein each circuit interval 2 comprises a circuit measurement point 3 and three-phase circuit impedance 4, and the circuit measurement points 3 are used for receiving current flowing into a current circuit interval under the condition of a preset value and obtaining zero sequence voltage and zero sequence current of the current circuit interval through the current; and the three-phase circuit impedance 4 is used for determining the zero-sequence impedance parameter of the current three-phase circuit impedance through the zero-sequence voltage and the zero-sequence current of the current line interval.
In a specific implementation scenario, as shown in fig. 2 and fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the interval zero sequence impedance parameter calculation circuit provided by the present invention. The interval zero sequence impedance parameter calculation circuit comprises n outgoing lines, four line intervals exist on the outgoing line 1, and the intervals are respectively as follows: the first line section 211, the second line section 212, the third line section 213, and the fourth line section 214. Wherein the first line section 211 of the outgoing line 1 includes a first line measurement point 311 and a first three-phase circuit impedance 411, the second line section 212 of the outgoing line 1 includes a second line measurement point 312 and a second three-phase circuit impedance 412, the third line section 213 of the outgoing line 1 includes a first line measurement point 313 and a first three-phase circuit impedance 413, and the fourth line section 214 of the outgoing line 1 includes a fourth line measurement point 314 and a fourth three-phase circuit impedance 414;
four line intervals exist on the outgoing line 2, and the line intervals are respectively: a first line section 221, a second line section 222, a third line section 223, and a fourth line section 224. Wherein the first line section 221 of the outgoing line 2 includes a first line measurement point 321 and a first three-phase circuit impedance 421, the second line section 222 of the outgoing line 2 includes a second line measurement point 322 and a second three-phase circuit impedance 422, the third line section 223 of the outgoing line 2 includes a third line measurement point 323 and a third three-phase circuit impedance 423, and the fourth line section 224 of the outgoing line 2 includes a fourth line measurement point 324 and a fourth three-phase circuit impedance 424;
Four line intervals exist on the outgoing line n, and the line intervals are respectively as follows: a first line section 2n1, a second line section 2n2, a third line section 2n3, and a fourth line section 2n4. The first line section 2n1 of the outgoing line n includes a first line measurement point 3n1 and a first three-phase circuit impedance 4n1, the second line section 2n2 of the outgoing line n includes a second line measurement point 3n2 and a second three-phase circuit impedance 4n2, the third line section 2n3 of the outgoing line n includes a third line measurement point 3n3 and a third three-phase circuit impedance 4n3, and the fourth line section 2n4 of the outgoing line n includes a fourth line measurement point 3n4 and a fourth three-phase circuit impedance 4n4.
The method comprises the steps that line measurement points of each line interval receive current flowing into the current line interval under the condition of a preset value, and zero sequence voltage and zero sequence current of the current line interval are obtained through the current; further, the zero-sequence impedance parameter of the current three-phase circuit impedance is determined through the zero-sequence voltage and the zero-sequence current of the current line interval.
It should be noted that the line measurement points may be distribution automation switches, fault indicators, or distributed measurement points of each outgoing line, where the line positions of the zero sequence voltage and the zero sequence current of the system may be measured, and the present invention is not limited in particular.
As shown in fig. 4, fig. 4 is a flowchart of an embodiment of a method for calculating a zero-sequence impedance parameter of a section according to the present invention. A method for calculating interval zero sequence impedance parameters comprises the following steps:
s101: providing current, setting any outlet line side single-phase grounding connected with the three-phase power supply 1, and raising the voltage amplitude of the neutral point to a preset value.
In a specific implementation scenario, the current is provided through the three-phase power supply 1, and any outgoing line side single-phase ground connected with the three-phase power supply 1 is set, so that the voltage amplitude of the neutral point is raised to a preset value. And under the condition of a preset value, calculating a plurality of line interval 2 zero sequence parameters.
S102: under the condition of a preset value, receiving current, and acquiring zero sequence impedance parameters of a plurality of line intervals 2 through the current.
In a specific implementation scenario, under the condition of a preset value, acquiring zero sequence voltages and zero sequence currents of the bus outgoing positions of all outgoing lines and a plurality of line intervals 2 respectively through currents; determining zero-sequence impedance parameters of three-phase circuit impedance 4 between a bus outgoing line position of a non-single-phase grounding line in each outgoing line and a first line measuring point 3 under the condition of a preset value according to zero-sequence voltages and zero-sequence currents of the bus outgoing lines of the outgoing lines and the line intervals 2; respectively determining zero sequence impedance parameters of three-phase circuit impedance 4 between adjacent line measurement points 3 of non-single-phase grounding lines in each outgoing line under the condition of a preset value according to the outgoing line position of each outgoing line bus and the zero sequence voltages and zero sequence currents of a plurality of line intervals 2; respectively determining zero-sequence impedance parameters of three-phase circuit impedance 4 in a line interval at the tail end of a non-single-phase grounding line in each outgoing line under the condition of a preset value according to the outgoing line position of each outgoing line bus and the zero-sequence voltages and the zero-sequence currents of a plurality of line intervals 2; setting the single-phase grounding of the other outgoing line side, and repeating the steps until the zero sequence impedance parameters of a plurality of line intervals 2 under the single-phase grounding condition of all the outgoing line sides are obtained.
As shown in fig. 5, fig. 5 is a flowchart of another embodiment of the interval zero-sequence impedance parameter calculation method provided by the present invention. A method for calculating interval zero sequence impedance parameters comprises the following steps:
s201: providing current, setting any outlet line side single-phase grounding connected with the three-phase power supply 1, and raising the voltage amplitude of the neutral point to a preset value.
S202: under the condition of a preset value, the zero sequence voltage and the zero sequence current of the bus outgoing positions of all outgoing lines and a plurality of line intervals 2 are respectively obtained through the current.
It should be noted that, the steps S201 to S202 are already discussed in detail in the implementation scenario shown in fig. 4, and are not described herein again.
S203: and determining zero-sequence impedance parameters of the three-phase circuit impedance 4 between the bus outgoing position of the non-single-phase grounding line and the first line measuring point 3 in each outgoing line under the condition of a preset value according to the zero-sequence voltage and zero-sequence current of each outgoing line bus outgoing position and the plurality of line intervals 2.
In a specific implementation scenario, determining a zero sequence voltage amplitude average value between a bus outgoing line position of a non-single-phase grounding line and a first line measurement point 3 in each outgoing line according to the zero sequence voltage and zero sequence current of each outgoing line bus outgoing line position and a plurality of line intervals 2; respectively determining absolute values of zero sequence current amplitude differences between bus outgoing positions of non-single-phase grounding lines and a first line measuring point 3 in each outgoing line according to the bus outgoing positions of each outgoing line and the zero sequence voltages and zero sequence currents of a plurality of line intervals 2; and respectively determining zero sequence impedance parameters of the three-phase circuit impedance 4 between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point 3 under the condition of a preset value according to the zero sequence voltage amplitude average value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point 3 and the absolute value of the zero sequence current amplitude difference value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point 3.
Preferably, the zero sequence impedance parameters of the three-phase circuit impedance 4 at the bus outlet of the non-single-phase grounding line and in the first line interval in each outlet line are determined according to the following formula:
wherein U 0n is zero sequence voltage at the bus outgoing line of the non-single-phase grounding line in each outgoing line, For the zero sequence voltage of the first line measuring point of the non-single-phase grounding line in each outgoing line,/>For the zero sequence current of the first line measuring point of the non-single-phase grounding line in each outgoing line, I 0n is the zero sequence current of the bus outgoing line of the non-single-phase grounding line in each outgoing line, and n is the outgoing line number.
S204: and respectively determining zero-sequence impedance parameters of the three-phase circuit impedance 4 between adjacent line measurement points 3 of the non-single-phase grounding line in each outgoing line under the condition of a preset value according to the zero-sequence voltage and the zero-sequence current of each outgoing line bus and a plurality of line intervals 2.
In a specific implementation scenario, determining zero sequence voltage amplitude average values between adjacent line measurement points 3 of non-single-phase grounding lines in each outgoing line according to zero sequence voltages and zero sequence currents of bus outgoing lines of each outgoing line and a plurality of line intervals 2 respectively; respectively determining absolute values of zero sequence current amplitude differences between adjacent line measurement points 3 of non-single-phase grounding lines in each outgoing line according to the outgoing line positions of the bus of each outgoing line and the zero sequence voltages and the zero sequence currents of a plurality of line intervals 2; and respectively determining zero-sequence impedance parameters of the three-phase circuit impedance 4 between adjacent line measurement points 3 of the non-single-phase grounding line in each outgoing line under the preset value condition according to the zero-sequence voltage amplitude average value between the adjacent line measurement points 3 and the absolute value of the zero-sequence current amplitude difference value between the adjacent line measurement points 3.
Preferably, under the preset value condition, the zero sequence impedance parameter of the three-phase circuit impedance 4 of the adjacent line measuring point 3 of the non-single-phase grounding line in each outgoing line is determined according to the following formula:
Wherein i is the number of line measurement points, i is more than or equal to 2, For the zero sequence voltage of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the line measuring point in the subsequent line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence current of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>And (3) the zero sequence current of a line measuring point in a subsequent line interval of a non-single-phase grounding line in each outgoing line, wherein n is the number of the outgoing line.
S205: and respectively determining zero-sequence impedance parameters of the three-phase circuit impedance 4 in the line interval at the tail end of the non-single-phase grounding line in each outgoing line under the condition of a preset value according to the zero-sequence voltage and the zero-sequence current of each outgoing line bus and the plurality of line intervals 2.
In a specific implementation scenario, determining the zero sequence voltage of a line section at the tail end of a non-single-phase grounding line in each outgoing line according to the zero sequence voltage and the zero sequence current of each outgoing line bus outlet and a plurality of line sections 2; respectively determining the zero sequence current of a line interval at the tail end of a non-single-phase grounding line in each outgoing line according to the bus outgoing position of each outgoing line and the zero sequence voltages and the zero sequence currents of a plurality of line intervals 2; and respectively determining zero-sequence impedance parameters of the three-phase circuit impedance 4 in the line interval at the tail end of each outgoing line under the preset value condition according to the zero-sequence voltage of the line interval at the tail end of each outgoing line and the zero-sequence current of the line interval at the tail end of the non-single-phase grounding line in each outgoing line.
Preferably, under the condition of a preset value, the zero-sequence impedance parameter of the three-phase circuit impedance 4 in the line interval 2 at the tail end of the non-single-phase grounding line in each outgoing line is determined according to the following formula:
Wherein, Zero sequence impedance parameter of three-phase circuit impedance in line interval of tail end of non-single-phase grounding line in each outgoing lineFor the zero sequence voltage of the line interval of the non-single-phase grounding line end in each outgoing line,/>And (3) the zero sequence current of the line interval at the tail end of the non-single-phase grounding line in each outgoing line, and n is the number of the outgoing line.
S206: setting the single-phase grounding of the other outgoing line side, and repeating the steps until the zero sequence impedance parameters of a plurality of line intervals 2 under the single-phase grounding condition of all the outgoing line sides are obtained.
Fig. 6 is a schematic structural diagram of an embodiment of a terminal according to the present invention, as shown in fig. 6. The terminal 20 comprises a memory 21 and a processor 22. The memory 21 stores a computer program which is executed by the processor 22 in operation to implement the method as shown in fig. 3 and 4.
The specific technical details of a method for calculating the interval zero-sequence impedance parameter implemented when the terminal 20 executes the computer program are discussed in detail in the foregoing method steps, so that the details are not repeated.
Fig. 7 is a schematic structural diagram of an embodiment of a storage medium according to the present invention, as shown in fig. 7. The storage medium 30 stores at least one computer program 31, and the computer program 31 is executed by the processor 22 to implement the method shown in fig. 3 and 4, and the detailed method is referred to above and will not be described herein. In one embodiment, the storage medium 30 may be a memory chip, a hard disk, a removable hard disk, a flash disk, an optical disk, a server, or the like.
The foregoing describes certain embodiments of the present disclosure, other embodiments being within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. Furthermore, the processes depicted in the accompanying drawings do not necessarily have to be in the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus, devices, non-transitory computer readable storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to portions of the description of method embodiments being relevant.
The apparatus, the device, the nonvolatile computer readable storage medium and the method provided in the embodiments of the present disclosure correspond to each other, and therefore, the apparatus, the device, and the nonvolatile computer storage medium also have similar advantageous technical effects as those of the corresponding method, and since the advantageous technical effects of the method have been described in detail above, the advantageous technical effects of the corresponding apparatus, device, and nonvolatile computer storage medium are not described herein again.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present specification. It will be appreciated by those skilled in the art that the present description may be provided as a method, system, or computer program product. Accordingly, the present specification embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present description embodiments may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present description is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the specification. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The description may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (12)
1. A section zero sequence impedance parameter calculation circuit is characterized in that the circuit comprises a three-phase power supply and a plurality of line sections,
The three-phase power supply is used for providing current, and is provided with any outlet line side single-phase grounding connected with the three-phase power supply and used for raising the voltage amplitude of a neutral point to a preset value;
And the circuit intervals are used for receiving the current under the preset value condition and acquiring zero sequence impedance parameters of the circuit intervals through the current.
2. The interval zero sequence impedance parameter calculation circuit according to claim 1, wherein the plurality of line intervals comprise line measurement points and three-phase circuit impedances,
The line measuring point is used for receiving the current flowing into the current line interval under the preset value condition, and acquiring the zero sequence voltage and the zero sequence current of the current line interval through the current;
and the three-phase circuit impedance is used for determining the zero-sequence impedance parameter of the current three-phase circuit impedance through the zero-sequence voltage and the zero-sequence current of the current line interval.
3. A method for calculating interval zero sequence impedance parameters, the method comprising:
Providing current, setting any outlet line side single-phase grounding connected with the three-phase power supply, and increasing the voltage amplitude of a neutral point to a preset value;
and under the preset value condition, receiving the current, and acquiring zero sequence impedance parameters of the plurality of line intervals through the current.
4. A method for calculating a zero-sequence impedance parameter of a section according to claim 3, wherein said receiving the current under the condition of the preset value, and obtaining the zero-sequence impedance parameter of the plurality of line sections by the current specifically comprises:
under the preset value condition, acquiring zero sequence voltage and zero sequence current at the bus outgoing positions of all outgoing lines and among the plurality of line intervals through the current respectively;
Determining zero-sequence impedance parameters of the three-phase circuit impedance between the bus outgoing position of the non-single-phase grounding line in each outgoing line and the first line measuring point under the preset value condition according to the zero-sequence voltage and zero-sequence current of the bus outgoing position of each outgoing line and the line intervals;
respectively determining zero sequence impedance parameters of the three-phase circuit impedance between adjacent line measurement points of non-single-phase grounding lines in each outgoing line under the preset value condition according to the bus outgoing line of each outgoing line and the zero sequence voltages and zero sequence currents of the plurality of line intervals;
Respectively determining zero-sequence impedance parameters of the three-phase circuit impedance in the line intervals of the tail ends of the non-single-phase grounding lines in each outgoing line under the preset value condition according to the bus outgoing positions of the outgoing lines and the zero-sequence voltages and the zero-sequence currents of the line intervals;
setting the single-phase grounding of the other outgoing line side, and repeating the steps until the zero sequence impedance parameters of the plurality of line intervals under the single-phase grounding condition of all the outgoing line sides are obtained.
5. The method for calculating the interval zero-sequence impedance parameter according to claim 4, wherein the determining, according to the bus outgoing line positions of the outgoing lines and the zero-sequence voltages and zero-sequence currents of the line intervals, the zero-sequence impedance parameter of the three-phase circuit impedance between the bus outgoing line positions of the non-single-phase grounding lines in the outgoing lines and the first line measuring point under the preset value condition includes:
Respectively determining a zero sequence voltage amplitude average value between a bus outgoing line position of a non-single-phase grounding line in each outgoing line and a first line measurement point according to the bus outgoing line position of each outgoing line and the zero sequence voltages and zero sequence currents among the line intervals;
Respectively determining absolute values of zero sequence current amplitude differences between bus outgoing positions of non-single-phase grounding lines in all outgoing lines and first line measurement points according to the bus outgoing positions of all outgoing lines and the zero sequence voltages and zero sequence currents among the line intervals;
And respectively determining zero sequence impedance parameters of three-phase circuit impedance between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the line measuring point under the condition of the preset value according to the zero sequence voltage amplitude average value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point and the absolute value of the zero sequence current amplitude difference value between the bus outgoing line position of the non-single-phase grounding line in each outgoing line and the first line measuring point.
6. The interval zero-sequence impedance parameter calculating method according to claim 5, wherein the determining the zero-sequence impedance parameter according to the average value of the zero-sequence voltage amplitudes between the bus-out line position and the first line measurement point of the non-single-phase grounding line in each outgoing line and the absolute value of the zero-sequence current amplitude difference between the bus-out line position and the first line measurement point of the non-single-phase grounding line in each outgoing line under the preset value condition comprises:
According to Determining zero sequence impedance parameters of three-phase circuit impedance at a bus outlet of a non-single-phase grounding line and between a first line in each outgoing line, wherein U 0n is zero sequence voltage at the bus outlet of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the first line measuring point of the non-single-phase grounding line in each outgoing line,/>For the zero sequence current of the first line measuring point of the non-single-phase grounding line in each outgoing line, I 0n is the zero sequence current of the bus outgoing line of the non-single-phase grounding line in each outgoing line, and n is the outgoing line number.
7. The method according to claim 4, wherein the determining the zero-sequence impedance parameters of the three-phase circuit impedance between the adjacent line measurement points of the non-single-phase grounding line in each outgoing line under the preset value conditions according to the zero-sequence voltage and the zero-sequence current of the bus outgoing line of each outgoing line and the line intervals respectively comprises:
Respectively determining a zero sequence voltage amplitude average value between adjacent line measurement points of a non-single-phase grounding line in each outgoing line according to the bus outgoing line of each outgoing line and the zero sequence voltages and zero sequence currents among the line intervals;
Respectively determining absolute values of zero sequence current amplitude differences between adjacent line measurement points of non-single-phase grounding lines in each outgoing line according to the outgoing line of each outgoing line bus and the zero sequence voltages and zero sequence currents among the line intervals;
And respectively determining zero sequence impedance parameters of three-phase circuit impedance between adjacent line measurement points of non-single-phase grounding lines in each outgoing line under the preset value condition according to the zero sequence voltage amplitude average value between the adjacent line measurement points and the absolute value of the zero sequence current amplitude difference value between the adjacent line measurement points.
8. The interval zero-sequence impedance parameter calculating method according to claim 7, wherein the determining the zero-sequence impedance parameter of the three-phase circuit impedance between the adjacent line measurement points of the non-single-phase grounding line in each outgoing line under the preset value condition according to the zero-sequence voltage amplitude average value between the adjacent line measurement points and the absolute value of the zero-sequence current amplitude difference value between the adjacent line measurement points comprises:
According to Determining zero sequence impedance parameters of three-phase circuit impedance of adjacent circuit measurement points of non-single-phase grounding circuits in all outgoing lines, wherein i is the number of circuit measurement points, i is more than or equal to 2,/>For the zero sequence voltage of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence voltage of the line measuring point in the subsequent line interval of the non-single-phase grounding line in each outgoing line,/>For the zero sequence current of the line measuring point in the front line interval of the non-single-phase grounding line in each outgoing line,/>And (3) the zero sequence current of a line measuring point in a subsequent line interval of a non-single-phase grounding line in each outgoing line, wherein n is the number of the outgoing line.
9. The method according to claim 4, wherein the determining the zero-sequence impedance parameters of the three-phase circuit impedance in the line section of the end of the non-single-phase grounding line in each outgoing line under the preset value conditions according to the zero-sequence voltage and the zero-sequence current of the bus outgoing line of each outgoing line and the line sections respectively includes:
respectively determining the zero sequence voltage of the line interval of the tail end of the non-single-phase grounding line in each outgoing line according to the bus outgoing position of each outgoing line and the zero sequence voltages and the zero sequence currents of the line intervals;
Respectively determining the zero sequence current of the line section at the tail end of the non-single-phase grounding line in each outgoing line according to the bus outgoing position of each outgoing line and the zero sequence voltages and the zero sequence currents of the line sections;
And respectively determining zero-sequence impedance parameters of the three-phase circuit impedance in the line interval of the tail end of each outgoing line under the preset value condition according to the zero-sequence voltage of the line interval of the tail end of each outgoing line and the zero-sequence current of the line interval of the tail end of the non-single-phase grounding line in each outgoing line.
10. The interval zero-sequence impedance parameter calculating method according to claim 9, wherein the determining the zero-sequence impedance parameter of the three-phase circuit impedance in the line interval at the end of each outgoing line under the preset value condition according to the zero-sequence voltage of the line interval at the end of each outgoing line and the zero-sequence current of the line interval at the end of the non-single-phase ground line in each outgoing line comprises:
According to Respectively determining zero sequence impedance parameters of three-phase circuit impedance in line intervals of the tail ends of non-single-phase grounding lines in each outgoing line under the preset value condition, wherein/>Zero sequence impedance parameter of three-phase circuit impedance in line interval of tail end of non-single-phase grounding line in each outgoing lineFor the zero sequence voltage of the line interval of the non-single-phase grounding line end in each outgoing line,/>And (3) the zero sequence current of the line interval at the tail end of the non-single-phase grounding line in each outgoing line, and n is the number of the outgoing line.
11. A storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the method according to any one of claims 3 to 10.
12. A terminal comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 3 to 10.
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