CN109655710A - Double circuits on same tower transmission line of electricity both ends measure the bearing calibration of phasor, apparatus and system - Google Patents
Double circuits on same tower transmission line of electricity both ends measure the bearing calibration of phasor, apparatus and system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
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Abstract
The invention discloses a kind of bearing calibrations of double circuits on same tower transmission line of electricity both ends measurement phasor, apparatus and system, including obtaining the double back transmission line both ends steady state voltage and current vector that operate normally；Double back transmission line both ends steady state voltage and electric current are calculated with sequence positive-sequence component and double back transmission line with sequence positive sequence wave impedance and propagation constant by six-sequence component；Same sequence positive sequence voltage phasor using double back transmission line both ends steady state voltage and electric current with sequence positive-sequence component and double back transmission line with sequence positive sequence wave impedance and propagation constant calculating at double back transmission line head end different distance；It is reference with double back transmission line head end steady state voltage, current phase, step-length is set, when seeking different location each apart from head end, asynchronous phase difference between line end steady state voltage, practical measurement of current phase and true phase seeks the average value of asynchronous phase difference.The present invention can be realized without synchro measure, phasing precision with higher.
Description
Technical Field
The invention belongs to the field of phase measurement of power transmission lines, and particularly relates to a method, a device and a system for correcting phasor measurement at two ends of a same-pole double-circuit power transmission line.
Background
With the rapid growth of economy in China, the scale and the number of electric loads are continuously increased, and the requirements of users on a power grid are continuously improved. Compared with single-loop power transmission, multi-loop power transmission has high transmission power and high system power transmission reliability, and is widely applied to high-voltage power transmission systems at present.
Compared with a synchronous Phasor Measurement Unit (PMU), the fault recording equipment is widely applied to transmission lines of 220kV and above with the advantages of low cost, convenience in waveform recording and the like. However, for a transmission line, the measurement of the fault recording devices at two ends of the transmission line has a certain asynchronous error, so that the phase information of the fault recording data loses the utilization value. In addition, the asynchronous phase reduces the accuracy of transmission line fault ranging using the steady-state synchronous phasor. Therefore, the phase calibration problem of the phasor measurement of the fault recording devices at two ends of the line is solved, and the method has important significance for improving the fault recording data value and reducing the fault positioning error of the power transmission line.
At present, for the phasor at two ends of a line measured by fault recording equipment, no asynchronous phase correction method of a system exists. Therefore, the method for correcting the measurement vectors at the two ends of the same-pole double-circuit power transmission line, which has a simple research principle and strong practicability, not only has theoretical research value, but also has important practical significance for engineering practice.
Disclosure of Invention
In order to solve the problems, the invention provides a method, a device and a system for correcting the phasor measurement at two ends of a same-pole double-circuit transmission line, which do not need synchronous measurement and have higher phase correction precision.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
in a first aspect, the present invention provides a method for correcting phasor measurement at two ends of a same-pole double-circuit transmission line, including:
(1) obtaining steady-state voltage and current vectors at two ends of normally-running double-circuit transmission line, and respectively recording the steady-state voltage and current vectors as Us、Is、UeAnd IeWherein U iss、IsRespectively, a steady-state voltage vector and a current vector, U, at the head end of the double-circuit transmission linee、IeRespectively obtaining steady-state voltage and current vectors at the tail end of the double-circuit power transmission line;
(2) based on the steady-state voltage and current vectors at the two ends of the double-circuit transmission line, the positive sequence component of the head-end voltage of the double-circuit transmission line in the same sequence is calculated by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constant
(3) Head end voltage based same sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantCalculating the same-sequence positive-sequence voltage phasor at a set distance from the head end of the double-circuit transmission line;
(4) based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line, taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as references, and calculating the asynchronous phase difference between the tail steady-state voltage and the current measured phase of the double-circuit transmission line and the real phase at the set distance from the head end;
(5) repeating the steps (3) and (4) from the head end of the double-circuit transmission line until the tail end of the line, and constructing an asynchronous phase difference vector gamma;
(6) and summing all asynchronous phase differences in the asynchronous phase difference vector gamma, averaging to obtain an asynchronous phase difference theta between the actual measured phase and the real phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference theta.
Preferably, the U iss、Is、UeAnd IeThe calculation formula of (2) is as follows:
wherein,respectively representing A, B, C phase voltage phasors of a first return line at the head end of the double-circuit transmission line;respectively representing the second head end of the double-circuit transmission lineLoop A, B, C phase voltage phasor;respectively representing phase current phasors of a first return line A, B, C at the head end of the double-circuit transmission line;respectively representing the phase current phasors of the second return wire A, B, C at the head end of the double-circuit transmission line;respectively representing the phase quantities of the first return line A, B, C phase voltage at the tail end of the double-circuit transmission line;respectively represents the phase quantity of the second return line A, B, C phase voltage at the tail end of the double-circuit transmission line;respectively represents the phase quantity of the first loop A, B, C phase current at the end of the double-loop power transmission line;the phase magnitudes of the phase currents in the second return line A, B, C at the end of the double-circuit transmission line are shown, respectively.
Preferably, the positive sequence component of the head end voltage of the double-circuit transmission line is in the same sequenceCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantThe calculation formulas of (A) and (B) are respectively as follows:
wherein M is a six-sequence component decoupling matrix; a is a twiddle factor; zLAnd YLRespectively a line unit length impedance matrix and an admittance matrix; [](5,5)The element representing the 5 th row and 5 th column of the matrix; [](5)Indicating the 5 th element of orientation
Preferably, the calculation formula of the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line is as follows:
wherein, Δ x is the step length, L is the total length of the double-circuit transmission line, and L is N Δ x;respectively is the same-sequence positive-sequence voltage phasor at a position k delta x away from the head end of the double-circuit transmission line, and k is more than or equal to 0 and less than or equal to N; p (k.DELTA.x) and Q (k.DELTA.x) are each independentlyThe real part and the imaginary part of (c); w (k.DELTA.x) and V (k.DELTA.x) are eachThe real part and the imaginary part of (c),positive sequence voltage and current phases of the same sequence at the head end of the double-circuit transmission lineAn amount;respectively are positive sequence voltage phasor and current phasor of the same sequence at the tail end of the double-circuit transmission line;the transmission line is respectively the same-sequence positive-sequence propagation constant and the wave impedance of the double-circuit transmission line.
Preferably, the calculation formula of the asynchronous phase difference between the steady-state voltage at the tail end of the double-circuit transmission line, the measured current phase and the real phase at the set distance from the head end is as follows:
delta (k delta x) is an asynchronous phase difference between the tail steady-state voltage and the current measured phase of the double-circuit transmission line and the real phase when the distance is k delta x from the head end; deltar(k.DELTA.x) and. deltai(k.DELTA.x) is each independently determined byThe real and imaginary parts of (a) are equal to the calculated asynchronous phase difference.
Preferably, the asynchronous phase difference vector is specifically:
wherein, Δ x is the step length, L is the total length of the dual-circuit transmission line, L is equal to N Δ x, k is greater than or equal to 0 and less than or equal to N, and δ (k Δ x) is the asynchronous phase difference between the real phase and the current measured phase and the steady-state voltage at the tail end of the dual-circuit transmission line when the distance is k Δ x from the head end; function Fz() Is an integer part taking a real number.
Preferably, the calculation formula of the asynchronous phase difference θ is:
wherein Γ (k) is the kth element of the asynchronous phase difference vector Γ; the symbol "|" is an absolute value.
In a second aspect, the present invention provides a phase correction device for asynchronously measuring phasors at two ends of a same-pole double-circuit transmission line, including:
an obtaining module for obtaining the steady state voltage and current vector at two ends of the normally running double-circuit transmission line, which are respectively marked as Us、Is、UeAnd IeWherein U iss、IsRespectively, a steady-state voltage vector and a current vector, U, at the head end of the double-circuit transmission linee、IeRespectively obtaining steady-state voltage and current vectors at the tail end of the double-circuit power transmission line;
a first calculating module, configured to calculate, based on the steady-state voltage and the current vectors at the two ends of the dual-circuit power transmission line, a positive sequence component of the head-end voltage of the dual-circuit power transmission line in the same sequence by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constant
A second calculation module for determining a head-end voltage-based in-sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantCalculating the same-sequence positive-sequence voltage phasor at a set distance from the head end of the double-circuit transmission line;
the third calculation module is used for calculating asynchronous phase differences between the tail steady-state voltage and the current actual measurement phase of the double-circuit transmission line and the real phase when the distance from the head end is set based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line and by taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as references;
the building module is used for repeating the steps (3) and (4) from the head end of the double-circuit power transmission line to the tail end of the line to build an asynchronous phase difference vector gamma;
and the phase correction module is used for summing the set distance asynchronous phase difference vectors gamma on the line and calculating an average value to obtain the asynchronous phase difference theta between the actual measured phase and the real phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference theta.
In a third aspect, the present invention provides a phase correction system for asynchronously measuring phasors at two ends of a same-pole double-circuit transmission line, including:
a processor adapted to implement instructions; and a storage device adapted to store a plurality of instructions adapted to be loaded by the processor and to perform the steps of any of the first aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method, a device and a system for correcting phasor measurement at two ends of a same-pole double-circuit transmission line, which are characterized in that firstly, steady-state voltage and current vectors at two ends of the normally-running double-circuit transmission line need to be obtained; secondly, calculating the homosequence positive sequence components of steady-state voltage and current at two ends of the double-circuit power transmission line, and the homosequence positive sequence wave impedance and the propagation constant of the double-circuit power transmission line by a six-sequence component method; thirdly, calculating the same-sequence positive-sequence voltage phasors at different distances from the head end of the double-circuit transmission line by using the steady-state voltage and current same-sequence positive-sequence components at the two ends of the double-circuit transmission line, the same-sequence positive-sequence wave impedance and the propagation constant of the double-circuit transmission line; and finally, setting step length by taking the steady-state voltage and current phases at the head end of the double-circuit transmission line as references, solving asynchronous phase differences between the actually measured phases of the steady-state voltage and current at the tail end of the line and the real phases when the line is away from the head end at different positions, and solving the average value of the asynchronous phase differences. The invention can realize the purpose of no need of synchronous measurement and has higher phase correction precision.
Drawings
FIG. 1 is a flow chart of a method in one embodiment of the invention;
fig. 2 is a schematic diagram of a simulation model of a double-circuit transmission line on the same pole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
As shown in fig. 2, the present invention provides a correction method for measuring phasors at two ends of a single-pole double-circuit transmission line, and specifically a phase correction method for asynchronously measuring phasors at two ends of a single-pole double-circuit transmission line, based on a typical topology structure of a single-pole double-circuit transmission line, where an overall process is shown in fig. 1, and specifically includes the following steps:
step (1) measuring points are arranged at the head end and the tail end of the power transmission line, and steady-state voltage and current vectors at two ends of the normally-running double-circuit power transmission line are obtained and are respectively recorded as Us、Is、UeAnd IeWherein U iss、IsRespectively representing steady-state voltage and current vectors at the head end of the double-circuit line; u shapee、IeRespectively representing steady-state voltage and current vectors at the tail end of the double-circuit line; u shapes、Is、UeAnd IeThe calculation formula of (2) is as follows:
wherein,respectively representing A, B, C phase voltage phasors of a first return line at the head end of the double-circuit transmission line;respectively representing the second head end of the double-circuit transmission lineLoop A, B, C phase voltage phasor;respectively representing phase current phasors of a first return line A, B, C at the head end of the double-circuit transmission line;respectively representing the phase current phasors of the second return wire A, B, C at the head end of the double-circuit transmission line;respectively representing the phase quantities of the first return line A, B, C phase voltage at the tail end of the double-circuit transmission line;respectively represents the phase quantity of the second return line A, B, C phase voltage at the tail end of the double-circuit transmission line;respectively represents the phase quantity of the first loop A, B, C phase current at the end of the double-loop power transmission line;respectively represents the phase quantity of the current of the second return line A, B, C at the tail end of the double-circuit transmission line;
step (2) based on the steady-state voltage and current vectors at the two ends of the double-circuit power transmission line, calculating the positive sequence component of the head-end voltage of the double-circuit power transmission line in the same sequence by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantThe calculation formula is as follows:
wherein M is a six-sequence component decoupling matrix; a is a twiddle factor; zLAnd YLRespectively a line unit length impedance matrix and an admittance matrix; [](5,5)The element representing the 5 th row and 5 th column of the matrix; [](5)Indicating the orientation of the 5 th element.
Step (3) is based on head end voltage same sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantAnd (3) calculating the same-sequence positive-sequence voltage phasor at a set distance from the head end of the double-circuit transmission line, wherein the specific calculation formula is as follows:
wherein, Δ x is a step length, L is a total length of the double-circuit transmission line, and L is N Δ x;respectively equal-sequence positive-sequence voltage phasors at a k delta x distance from the head end of the double-circuit transmission line; p (k.DELTA.x) and Q (k.DELTA.x) are each independentlyThe real part and the imaginary part of (c); w (k.DELTA.x) and V (k.DELTA.x) are eachThe real part and the imaginary part of the voltage phase vector are expressed by the formula, namely the same-sequence positive-sequence voltage phasor at the position k delta x (k is more than or equal to 0 and less than or equal to N) away from the head end of the double-circuit transmission line is calculated;
and (4) calculating the asynchronous phase difference between the tail steady-state voltage and the current actual measurement phase of the double-circuit transmission line and the real phase when the distance (k delta x) from the head end is set based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line and by taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as reference, wherein the specific calculation formula is as follows:
wherein, δ (k Δ x) is an asynchronous phase difference between the steady-state voltage at the tail end of the double-circuit transmission line, the current actual measurement phase and the real phase; deltar(k.DELTA.x) and. deltai(k.DELTA.x) is each independently determined byThe real and imaginary parts of (a) are equal to the calculated asynchronous phase difference.
And (5) repeating the steps (3) and (4) from the head end (k is 0) of the double-circuit transmission line to the tail end (k is N) of the line, and constructing an asynchronous phase difference vector gamma:
wherein the function Fz() Is the integer part of the real number; Δ x can take the value 1 km;
step (6) summing the distance asynchronous phase difference vectors Γ set on the line, and averaging to obtain an asynchronous phase difference θ between the actual measured phase and the actual phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference θ, in a specific implementation manner of this embodiment, specifically:
calculating an asynchronous phase difference theta between a measured phase and a real phase of voltage and current phasors at the head end and the tail end of the line measured by fault recording, wherein the calculation formula of the asynchronous phase difference theta is as follows:
wherein Γ (k) is the kth element of the amount of orientation Γ; the symbol "|" is an absolute value.
Simulation verification
A500 kV same-pole double-circuit transmission line with the total length of 100km is built on PSCAD simulation software, and a schematic diagram of a simulation model is shown in FIG. 2. Wherein, the equivalent power voltage of both ends system is 75kV, and two transmission line both ends transformer type capacity are 600MVA, and the transformation ratio respectively is: 75kV/500kV and 500kV/75 kV. And respectively measuring the voltage and the current of the double-circuit line at the head end and the tail end of the double-circuit transmission line. The double-circuit transmission line adopts a frequency-dependent characteristic model which accords with the reality. A four-split conductor is erected by adopting a double-loop tangent tower, and the type number of the four-split conductor is as follows: 4 XLGJ-300. The calculated homosequence positive sequence propagation constant and wave impedance of the double-circuit transmission line are about: 2.9656×10-8+j1.0857×10-6And (228.2229-j5.7538) Ω. And respectively adding different phase translation amounts to the double-loop stable state voltage and the double-loop stable state current measured at the right end of the double-loop power transmission line by taking the phase of the double-loop stable state voltage and the phase of the double-loop stable state current measured at the left end of the double-loop power transmission line as reference so as to simulate the asynchronous sampling characteristic of the fault recording equipment. The method provided by the invention is adopted to estimate the added phase translation amount, and the obtained result is shown in table 1. As can be seen from the table: the method provided by the invention has better correction precision for different asynchronous measurement phases.
TABLE 1 estimation of phase shift for different unsynchronized measured phasors
| True value (degree) | 5 | 8 | 11 | 14 | 17 |
| Estimate (degree) | 4.8862 | 7.8422 | 10.8371 | 13.9136 | 17.1146 |
| Estimating absolute error (degree) | 0.1139 | 0.1578 | 0.1629 | 0.0864 | 0.1146 |
Example 2
The embodiment of the invention provides a phase correction device for asynchronously measuring phasors at two ends of a same-pole double-circuit transmission line, which comprises:
an obtaining module for obtaining the steady state voltage and current vector at two ends of the normally running double-circuit transmission line, which are respectively marked as Us、Is、UeAnd IeWherein U iss、IsRespectively, a steady-state voltage vector and a current vector, U, at the head end of the double-circuit transmission linee、IeRespectively obtaining steady-state voltage and current vectors at the tail end of the double-circuit power transmission line;
a first calculating module, configured to calculate, based on the steady-state voltage and the current vectors at the two ends of the dual-circuit power transmission line, a positive sequence component of the head-end voltage of the dual-circuit power transmission line in the same sequence by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constant
A second calculation module for determining a head-end voltage-based in-sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantCalculating the same-sequence positive-sequence voltage phasor at a set distance from the head end of the double-circuit transmission line;
the third calculation module is used for calculating asynchronous phase differences between the tail steady-state voltage and the current actual measurement phase of the double-circuit transmission line and the real phase when the distance from the head end is set based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line and by taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as references;
the building module is used for repeating the steps (3) and (4) from the head end of the double-circuit power transmission line to the tail end of the line to build an asynchronous phase difference vector gamma;
and the phase correction module is used for summing the set distance asynchronous phase difference vectors gamma on the line and calculating an average value to obtain the asynchronous phase difference theta between the actual measured phase and the real phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference theta.
Example 3
The embodiment of the invention provides a phase correction system for asynchronously measuring phasors at two ends of a same-pole double-circuit transmission line, which comprises:
a processor adapted to implement instructions; and a storage device adapted to store a plurality of instructions adapted to be loaded by the processor and to perform the steps of any of embodiment 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A correction method for measuring phasors at two ends of a same-pole double-circuit transmission line is characterized by comprising the following steps:
(1) obtaining steady-state voltage and current vectors at two ends of normally-running double-circuit transmission line, and respectively recording the steady-state voltage and current vectors as Us、Is、UeAnd IeWherein U iss、IsRespectively, a steady-state voltage vector and a current vector, U, at the head end of the double-circuit transmission linee、IeRespectively obtaining steady-state voltage and current vectors at the tail end of the double-circuit power transmission line;
(2) based on the double-circuit transmission wireThe voltage and current vectors of the two ends of the line are stable, and the positive sequence component of the head end voltage of the double-circuit transmission line in the same sequence is calculated by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constant
(3) Head end voltage based same sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantCalculating the same-sequence positive-sequence voltage phasor at a set distance from the head end of the double-circuit transmission line;
(4) based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line, taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as references, and calculating the asynchronous phase difference between the tail steady-state voltage and the current measured phase of the double-circuit transmission line and the real phase at the set distance from the head end;
(5) repeating the steps (3) and (4) from the head end of the double-circuit transmission line until the tail end of the line, and constructing an asynchronous phase difference vector gamma;
(6) and summing all asynchronous phase differences in the asynchronous phase difference vector gamma, averaging to obtain an asynchronous phase difference theta between the actual measured phase and the real phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference theta.
2. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 1, wherein the method comprises the following steps: the U iss、Is、UeAnd IeThe calculation formula of (2) is as follows:
wherein,respectively representing A, B, C phase voltage phasors of a first return line at the head end of the double-circuit transmission line;
respectively representing the phase quantities of the A, B, C phase voltages of the second return line at the head end of the double-circuit transmission line;
respectively representing phase current phasors of a first return line A, B, C at the head end of the double-circuit transmission line;
respectively representing the phase current phasors of the second return wire A, B, C at the head end of the double-circuit transmission line;
respectively representing the phase quantities of the first return line A, B, C phase voltage at the tail end of the double-circuit transmission line;
respectively represents the phase quantity of the second return line A, B, C phase voltage at the tail end of the double-circuit transmission line;
respectively represents the phase quantity of the first loop A, B, C phase current at the end of the double-loop power transmission line;the phase magnitudes of the phase currents in the second return line A, B, C at the end of the double-circuit transmission line are shown, respectively.
3. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 1, wherein the method comprises the following steps: the head end voltage of the double-circuit transmission line is in the same sequence and the positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantThe calculation formulas of (A) and (B) are respectively as follows:
wherein M is a six-sequence component decoupling matrix; a is a twiddle factor; zLAnd YLRespectively a line unit length impedance matrix and an admittance matrix; [](5,5)The element representing the 5 th row and 5 th column of the matrix; [](5)Indicating the orientation of the 5 th element.
4. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 1, wherein the method comprises the following steps: the calculation formula of the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line is as follows:
wherein, Δ x is the step length, L is the total length of the double-circuit transmission line, and L is N Δ x;respectively is the same-sequence positive-sequence voltage phasor at a position k delta x away from the head end of the double-circuit transmission line, and k is more than or equal to 0 and less than or equal to N; p (k.DELTA.x) and Q (k.DELTA.x) are each independentlyThe real part and the imaginary part of (c); w (k.DELTA.x) and V (k.DELTA.x) are eachThe real part and the imaginary part of (c),respectively are positive sequence voltage phasor and positive sequence current phasor of the head end of the double-circuit transmission line;respectively are positive sequence voltage phasor and current phasor of the same sequence at the tail end of the double-circuit transmission line;the transmission line is respectively the same-sequence positive-sequence propagation constant and the wave impedance of the double-circuit transmission line.
5. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 1, wherein the method comprises the following steps: the calculation formula of the asynchronous phase difference between the steady-state voltage at the tail end of the double-circuit transmission line and the actual phase when the distance is set from the head end is as follows:
delta (k delta x) is an asynchronous phase difference between the tail steady-state voltage and the current measured phase of the double-circuit transmission line and the real phase when the distance is k delta x from the head end; deltar(k.DELTA.x) and. deltai(k.DELTA.x) is each independently determined byThe real and imaginary parts of (a) are equal to the calculated asynchronous phase difference.
6. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 1 or 5, wherein: the asynchronous phase difference vector is specifically:
wherein, Δ x is the step length, L is the total length of the dual-circuit transmission line, L is equal to N Δ x, k is greater than or equal to 0 and less than or equal to N, and δ (k Δ x) is the asynchronous phase difference between the real phase and the current measured phase and the steady-state voltage at the tail end of the dual-circuit transmission line when the distance is k Δ x from the head end; function Fz() Is an integer part taking a real number.
7. The method for correcting phasor measurement at two ends of a double-circuit transmission line on the same pole according to claim 6, wherein: the calculation formula of the asynchronous phase difference theta is as follows:
wherein Γ (k) is the kth element of the asynchronous phase difference vector Γ; the symbol "|" is an absolute value.
8. The utility model provides a with two transmission line both ends asynchronous phase correction device who measures phasor which of pole which characterized in that includes:
an obtaining module for obtaining the steady state voltage and current vector at two ends of the normally running double-circuit transmission line, which are respectively marked as Us、Is、UeAnd IeWherein U iss、IsRespectively, a steady-state voltage vector and a current vector, U, at the head end of the double-circuit transmission linee、IeRespectively obtaining steady-state voltage and current vectors at the tail end of the double-circuit power transmission line;
a first calculating module, configured to calculate, based on the steady-state voltage and the current vectors at the two ends of the dual-circuit power transmission line, a positive sequence component of the head-end voltage of the dual-circuit power transmission line in the same sequence by using a six-sequence component methodCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constant
A second calculation module for determining a head-end voltage-based in-sequence positive sequence componentCurrent in-phase positive sequence componentPositive sequence voltage with the same sequence of end voltageCurrent in-phase positive sequence componentAnd double-circuit transmission line same-sequence positive-sequence wave impedanceAnd propagation constantCalculating the set distance of the head ends of the double-circuit transmission linesThe same-sequence positive-sequence voltage phasor;
the third calculation module is used for calculating asynchronous phase differences between the tail steady-state voltage and the current actual measurement phase of the double-circuit transmission line and the real phase when the distance from the head end is set based on the same-sequence positive-sequence voltage phasor at the set distance from the head end of the double-circuit transmission line and by taking the steady-state voltage and the current phase of the head end of the double-circuit transmission line as references;
the building module is used for repeating the steps (3) and (4) from the head end of the double-circuit power transmission line to the tail end of the line to build an asynchronous phase difference vector gamma;
and the phase correction module is used for summing the set distance asynchronous phase difference vectors gamma on the line and calculating an average value to obtain the asynchronous phase difference theta between the actual measured phase and the real phase of the voltage and current phasors at the head end and the tail end of the double-circuit transmission line, and performing phase correction based on the asynchronous phase difference theta.
9. The utility model provides a with two transmission line both ends asynchronous phase correction system who measures phasor of pole which characterized in that includes:
a processor adapted to implement instructions; and a storage device adapted to store a plurality of instructions adapted to be loaded by a processor and to perform the steps of any of claims 1 to 7.
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