CN111398682A - Method for measuring by using unmanned aerial vehicle in distribution line design stage - Google Patents
Method for measuring by using unmanned aerial vehicle in distribution line design stage Download PDFInfo
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- CN111398682A CN111398682A CN202010322693.1A CN202010322693A CN111398682A CN 111398682 A CN111398682 A CN 111398682A CN 202010322693 A CN202010322693 A CN 202010322693A CN 111398682 A CN111398682 A CN 111398682A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
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Abstract
The invention discloses a method for measuring by using an unmanned aerial vehicle in a distribution line design stage, which comprises the following steps: the method comprises the following steps: the current measurement unit and the voltage measurement unit are installed on the unmanned aerial vehicle, current and voltage synchronous phasor data at two ends of a distribution line are respectively obtained, and the current and voltage synchronous phasor data are transmitted to a ground master station system through a data concentrator; step two: and the master station system receives and stores the phase angle, amplitude and frequency data with accurate time scales measured at two ends. The invention has the beneficial effects that: the real-time line parameter measuring method is more accurate than the conventional line parameter setting calculation method, provides a standard data base for system analysis, can operate in an off-line mode and an on-line mode, and can store historical actions and data; the zero sequence current at the tail end of the mutual inductance circuit takes the influence of zero sequence distributed capacitance on the circuit on the measurement result into account, thereby greatly improving the measurement precision of the zero sequence impedance parameter of the circuit.
Description
Technical Field
The invention relates to the technical field of distribution line measurement, in particular to a method for measuring by using an unmanned aerial vehicle in a distribution line design stage.
Background
The electric power system operation and the grasp of the electric network characteristic by the analyst depend on the real-time monitoring and analysis based on the electric network model. Accurate grid parameters are the basis for forming accurate grid models for power system calculations. Therefore, the accuracy and the reliability of the power grid parameters are improved, and the method has great significance for safe and stable operation of the power grid.
In view of the fact that the specific situation of each line is different, and transmission lines, especially lines with voltage class of 220kV and above, almost have running lines running parallel to the transmission lines or erected on the same pole, which brings great interference and difficulty to parameter measurement of the transmission lines. Due to more influencing factors and more or less under-complete consideration in the theoretical calculation of the design, the actual parameters of the line and the design parameters may have larger difference, and the accuracy of state estimation, load flow calculation, network loss analysis, fault analysis and relay protection setting calculation and the reliability of the calculation result are further influenced. In the actual measurement of line parameters, due to the influence of factors such as too long line, insufficient capacity of a measuring device or mutual inductance of parallel lines, the actual measurement parameters obtained by the line power failure measurement mode often have a large difference from theoretical values, so that the accuracy is questioned.
In summary, one technical problem that is urgently solved by those skilled in the art is: how to find a device and a method which have comprehensive work and high efficiency under the condition of normal operation of a power transmission and distribution system to realize the measurement of a power transmission and distribution line.
Disclosure of Invention
The invention aims to provide a method for measuring by using an unmanned aerial vehicle in the distribution line design stage, wherein the method for measuring line parameters in real time is more accurate than the conventional method for calculating the setting of the line parameters, provides a standard data base for system analysis, can operate in an off-line mode and an on-line mode, and can store historical actions and data; the zero sequence current at the tail end of the mutual inductance circuit takes the influence of zero sequence distributed capacitance on the circuit on the measurement result into account, thereby greatly improving the measurement precision of the zero sequence impedance parameter of the circuit.
The technical scheme of the invention is realized as follows:
a method for measuring by using an unmanned aerial vehicle in a distribution line design stage comprises the following steps:
the method comprises the following steps: the current measurement unit and the voltage measurement unit are installed on the unmanned aerial vehicle, current and voltage synchronous phasor data at two ends of a distribution line are respectively obtained, and the current and voltage synchronous phasor data are transmitted to a ground master station system through a data concentrator;
step two: the master station system receives and stores phase angle, amplitude and frequency data with accurate time scales measured at two ends;
step three: and calculating positive sequence pi-type equivalent parameters and zero sequence impedance of the power distribution bar line through the measured data at the two ends of the line.
Further, the specific steps of the first step are as follows:
a. the data acquisition terminal is connected to two ends of the line by taking the unmanned aerial vehicle as a measurement unit;
b. and acquiring synchronous phasor data of corresponding nodes at the same time point through a time scale provided by the GPS synchronous clock unit and transmitting the synchronous phasor data to the master station system.
Further, the third step of positive sequence pi-type equivalent parameter calculation specifically comprises the following steps:
A. establishing a pi-shaped equivalent circuit of the power transmission line by adopting a distributed parameter model;
B. according to a sequence component method, obtaining positive sequence voltage and current phasors according to synchronous voltage and current phasor parameters at two ends of a line;
obtaining zero sequence voltage and zero sequence current for measurement calculation by the following measurement modes: powering off the two measured mutual inductance distribution lines, wherein the two lines are respectively numbered as a first line and a second line; the tail end three phases of the first line are in short circuit and then are grounded, and the head end three phases are in short circuit; the tail end three phases of the second line are grounded after short circuit, and the head end three phases are short connected; then measuring zero sequence voltage and zero sequence current of the first line and the second line respectively; measuring the zero sequence voltage and the zero sequence current of the first line: injecting power frequency zero sequence current or pilot frequency zero sequence current into the head end of the first line, measuring zero sequence voltage at the head end of the first line and zero sequence current at the tail end of the first line, and measuring zero sequence voltage at the head end of the second line; and measuring the zero sequence voltage and the zero sequence current of the second line: injecting power frequency current or pilot frequency current into the head end of the second line, measuring zero sequence voltage at the head end of the second line and zero sequence current at the tail end of the second line, and measuring zero sequence voltage at the head end of the first line; and (II) synchronously sampling zero-sequence voltage and zero-sequence current on the two mutual inductance circuits by utilizing a GPS technology to obtain zero-sequence current and zero-sequence voltage data on the mutual inductance circuits: acquiring a time reference with an error less than 1 microsecond by utilizing the time service function of a global satellite positioning system, simultaneously acquiring zero-sequence current and zero-sequence voltage in two mutual inductance circuits under the GPS time synchronization, and storing acquired data in a data acquisition device in a file manner; and (III) after the measurement is finished, summarizing the measurement data of each measurement point into a computer.
The invention has the beneficial effects that: synchronous phasor measurement terminal is realized through unmanned aerial vehicle, real-time and accuracy of distribution network data acquisition are promoted. The real-time line parameter measuring method is more accurate than the conventional line parameter setting calculation method, provides a standard data base for system analysis, can operate in an off-line mode and an on-line mode, and can store historical actions and data; the zero sequence current at the tail end of the mutual inductance circuit takes the influence of zero sequence distributed capacitance on the circuit on the measurement result into account, thereby greatly improving the measurement precision of the zero sequence impedance parameter of the circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
According to the embodiment of the invention, a method for measuring by using an unmanned aerial vehicle in the design stage of a distribution line is provided.
The method for measuring by using the unmanned aerial vehicle in the distribution line design stage comprises the following steps:
the method comprises the following steps: the current measurement unit and the voltage measurement unit are installed on the unmanned aerial vehicle, current and voltage synchronous phasor data at two ends of a distribution line are respectively obtained, and the current and voltage synchronous phasor data are transmitted to a ground master station system through a data concentrator;
step two: the master station system receives and stores phase angle, amplitude and frequency data with accurate time scales measured at two ends;
step three: and calculating positive sequence pi-type equivalent parameters and zero sequence impedance of the power distribution bar line through the measured data at the two ends of the line.
In one embodiment, the specific steps of step one are:
a. the data acquisition terminal is connected to two ends of the line by taking the unmanned aerial vehicle as a measurement unit;
b. and acquiring synchronous phasor data of corresponding nodes at the same time point through a time scale provided by the GPS synchronous clock unit and transmitting the synchronous phasor data to the master station system.
In one embodiment, the positive sequence pi-type equivalent parameter calculation in step three includes the following specific steps:
A. establishing a pi-shaped equivalent circuit of the power transmission line by adopting a distributed parameter model;
B. according to a sequence component method, obtaining positive sequence voltage and current phasors according to synchronous voltage and current phasor parameters at two ends of a line;
obtaining zero sequence voltage and zero sequence current for measurement calculation by the following measurement modes: powering off the two measured mutual inductance distribution lines, wherein the two lines are respectively numbered as a first line and a second line; the tail end three phases of the first line are in short circuit and then are grounded, and the head end three phases are in short circuit; the tail end three phases of the second line are grounded after short circuit, and the head end three phases are short connected; then measuring zero sequence voltage and zero sequence current of the first line and the second line respectively; measuring the zero sequence voltage and the zero sequence current of the first line: injecting power frequency zero sequence current or pilot frequency zero sequence current into the head end of the first line, measuring zero sequence voltage at the head end of the first line and zero sequence current at the tail end of the first line, and measuring zero sequence voltage at the head end of the second line; and measuring the zero sequence voltage and the zero sequence current of the second line: injecting power frequency current or pilot frequency current into the head end of the second line, measuring zero sequence voltage at the head end of the second line and zero sequence current at the tail end of the second line, and measuring zero sequence voltage at the head end of the first line; and (II) synchronously sampling zero-sequence voltage and zero-sequence current on the two mutual inductance circuits by utilizing a GPS technology to obtain zero-sequence current and zero-sequence voltage data on the mutual inductance circuits: acquiring a time reference with an error less than 1 microsecond by utilizing the time service function of a global satellite positioning system, simultaneously acquiring zero-sequence current and zero-sequence voltage in two mutual inductance circuits under the GPS time synchronization, and storing acquired data in a data acquisition device in a file manner; and (III) after the measurement is finished, summarizing the measurement data of each measurement point into a computer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A method for measuring by using an unmanned aerial vehicle in a distribution line design stage is characterized by comprising the following steps:
the method comprises the following steps: the current measurement unit and the voltage measurement unit are installed on the unmanned aerial vehicle, current and voltage synchronous phasor data at two ends of a distribution line are respectively obtained, and the current and voltage synchronous phasor data are transmitted to a ground master station system through a data concentrator;
step two: the master station system receives and stores phase angle, amplitude and frequency data with accurate time scales measured at two ends;
step three: and calculating the zero sequence impedance of the power distribution bar line according to the measured data at the two ends of the line.
2. The method for measuring distribution line design by using unmanned aerial vehicle according to claim 1, wherein the specific steps in the first step are as follows:
a. the data acquisition terminal is connected to two ends of the line by taking the unmanned aerial vehicle as a measurement unit;
b. and acquiring synchronous phasor data of corresponding nodes at the same time point through a time scale provided by the GPS synchronous clock unit and transmitting the synchronous phasor data to the master station system.
3. The method for measuring by using the unmanned aerial vehicle in the distribution line design stage according to claim 1, wherein the zero sequence impedance of the third step comprises the following specific steps:
obtaining zero sequence voltage and zero sequence current for measurement calculation by the following measurement modes: powering off the two measured mutual inductance distribution lines, wherein the two lines are respectively numbered as a first line and a second line; the tail end three phases of the first line are in short circuit and then are grounded, and the head end three phases are in short circuit; the tail end three phases of the second line are grounded after short circuit, and the head end three phases are short connected; then measuring zero sequence voltage and zero sequence current of the first line and the second line respectively; measuring the zero sequence voltage and the zero sequence current of the first line: injecting power frequency zero sequence current or pilot frequency zero sequence current into the head end of the first line, measuring zero sequence voltage at the head end of the first line and zero sequence current at the tail end of the first line, and measuring zero sequence voltage at the head end of the second line; and measuring the zero sequence voltage and the zero sequence current of the second line: injecting power frequency current or pilot frequency current into the head end of the second line, measuring zero sequence voltage at the head end of the second line and zero sequence current at the tail end of the second line, and measuring zero sequence voltage at the head end of the first line; synchronously sampling zero-sequence voltage and zero-sequence current on two mutual inductance circuits by utilizing a GPS technology to obtain zero-sequence current and zero-sequence voltage data on the mutual inductance circuits; acquiring a time reference with an error less than 1 microsecond by utilizing the time service function of a global satellite positioning system, simultaneously acquiring zero-sequence current and zero-sequence voltage in two mutual inductance circuits under the GPS time synchronization, and storing acquired data in a data acquisition device in a file manner; and (III) after the measurement is finished, summarizing the measurement data of each measurement point into a computer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI822099B (en) * | 2022-06-09 | 2023-11-11 | 國立臺灣科技大學 | Current measurement system and method |
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