CN106324347B - T-type wiring transmission line power frequency positive sequence impedance measurement method - Google Patents
T-type wiring transmission line power frequency positive sequence impedance measurement method Download PDFInfo
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Abstract
A kind of T-type wiring transmission line power frequency positive sequence impedance measurement method, T-type wiring transmission line is made of the first branch, second branch, third branch, method includes: successively to execute three kinds of measurement methods after (a) has a power failure T-type wiring transmission line, apply symmetrical three-phase main-frequency voltage in first branch head end respectively for every kind of measurement method, and obtains the voltage signal and current signal of the T-type wiring transmission line under every kind of measurement method；(b) voltage signal of the acquisition in step (a) is parsed into corresponding power frequency positive sequence voltage and current signal parses corresponding power frequency forward-order current, and the circuit structure Simultaneous Equations under three kinds of measurement methods is combined to calculate power frequency positive sequence impedance parameter.Three kinds of measurement methods are easily achieved, convenient and simple；Further, step (a) can realize the signal of each branch of synchronous acquisition synchronization different substation based on GPS technology, guarantee the accuracy of measurement result；Further, Fourier and sequence decomposition method can be used when step (b) parses, improve measurement accuracy.
Description
Technical field
The present invention relates to field of power system more particularly to a kind of T-type wiring transmission line power frequency positive sequence impedance measurement sides
Method.
Background technique
Transmission line of electricity is the carrier of one of main component part of electric system and power Transmission, in the power system
Role is very big.The parameter of transmission line of electricity refers mainly to its power frequency parameter, it includes positive sequence impedance, zero sequence impedance, positive sequence electricity
Coupled capacitor and mutual inductive impedance between appearance, zero sequence capacitor and multi circuit transmission lines etc., these parameters are mainly used for electric system event
Hinder analysis, Load flow calculation, calculation of short-circuit current, relay protection setting calculation and selection power system operation mode etc., these
Line parameter circuit value is the necessary parameter for establishing mathematical models of power system, without accurate line parameter circuit value it is difficult to ensure that above-mentioned calculating
Correctly, it just not can guarantee the correct movement of device, and then influence the normal operation of electric system.
Therefore, accurate transmission line parameter is obtained to power system security, stabilization, reliability service with highly important
Meaning.And these calculate complicated and are influenced by many uncertain factors, geometry, electric current including transmission line of electricity, environment
The factors such as temperature, wind speed, soil resistivity, lightning conducter erection mode and line route can not obtain this by theoretical calculation
The exact value of a little parameters.It requires to carry out actual measurement to new erection and improved power circuit power frequency parameter in engineering.
With the reinforcement of electric network composition, T-type connection circuitry is appeared widely in the power grid of 110kV and 35kV voltage class.T
The advantages of molded line road is: structure is simple, and device therefor element is few, protection setting be easy, dispatching running way is flexible, reliability compared with
It is high.Therefore, it is very necessary for measuring to the power frequency positive sequence impedance of T-type connection circuitry.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, providing a kind of T-type wiring transmission of electricity
Route power frequency positive sequence impedance measurement method.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of T-type wiring transmission line power frequency just
Sequence impedance measurement method, the T-type wiring transmission line is by the first branch of connection different substation, second branch, third branch
Road composition, which comprises
(a), three kinds of measurement methods, needle successively data collection steps: are executed after T-type wiring transmission line to be measured is had a power failure
Symmetrical three-phase main-frequency voltage is applied in first branch head end respectively to every kind of measurement method, three kinds of measurement methods include:
Measurement method one: second branch end three-phase is shorted, third branch end difference three-phase open circuit, acquires first
The voltage signal and current signal of road head end；
Measurement method two: second branch end difference three-phase open circuit, third branch end three-phase are shorted, acquire first
The voltage signal and current signal of road head end；
Measurement method three: second branch and third branch end difference three-phase are shorted, acquisition first branch head end
Voltage signal and current signal and second branch/third branch current signal；
(b), data processing step: the voltage signal obtained under every kind of measurement method of step (a) is parsed corresponding
Power frequency positive sequence voltage and current signal parse corresponding power frequency forward-order current, and combine the circuit knot under three kinds of measurement methods
Structure calculates power frequency positive sequence impedance parameter.
In T-type wiring transmission line power frequency positive sequence impedance measurement method of the present invention, if in the step (a)
The current signal of second branch is acquired in measurement method three, calculating power frequency positive sequence impedance parameter in the step (b) includes:
(b11), based on power frequency positive sequence voltage, power frequency forward-order current and the circuit structure simultaneous side under three kinds of measurement methods
Journey group (1), solution obtain the power frequency positive sequence impedance of three branches are as follows:
(b12), three are determined based on the power frequency positive sequence impedance and formula (2) that solution obtains three branches in step (b11)
The positive sequence resistance of a branch and forward-sequence reactance；
Zn=Rn+j·Xn, n=1,2,3 (2)
Wherein, ZnIndicate the power frequency positive sequence impedance of branch, RnIndicate the positive sequence resistance of branch, XnIndicate the positive sequence electricity of branch
It is anti-, U1a、I1aRespectively indicate the power frequency positive sequence electricity of the first branch head end obtained based on measurement method one and step (b) processing
Pressure and power frequency forward-order current, U1b、I1bIt is first to respectively indicate the first branch obtained based on measurement method two and step (b) processing
The power frequency positive sequence voltage and power frequency forward-order current at end, U1c、I1c、I2cIt respectively indicates and is handled based on measurement method three and step (b)
The power frequency positive sequence voltage and power frequency forward-order current of obtained first branch head end and the power frequency forward-order current of second branch.
In T-type wiring transmission line power frequency positive sequence impedance measurement method of the present invention, if in the step (a)
The current signal of third branch is acquired in measurement method three, calculating power frequency positive sequence impedance parameter in the step (b) includes:
(b21), based on power frequency positive sequence voltage, power frequency forward-order current and the circuit structure simultaneous side under three kinds of measurement methods
Journey group (3), solution obtain the power frequency positive sequence impedance parameter of three branches are as follows:
(b22), three are determined based on the power frequency positive sequence impedance and formula (2) that solution obtains three branches in step (b21)
The positive sequence resistance of a branch and forward-sequence reactance；
Zn=Rn+j·Xn, n=1,2,3 (2)
Wherein, ZnIndicate the power frequency positive sequence impedance of branch, RnIndicate the positive sequence resistance of branch, XnIndicate the positive sequence electricity of branch
It is anti-, U1a、I1aRespectively indicate the power frequency positive sequence electricity of the first branch head end obtained based on measurement method one and step (b) processing
Pressure and power frequency forward-order current, U1b、I1bIt is first to respectively indicate the first branch obtained based on measurement method two and step (b) processing
The power frequency positive sequence voltage and power frequency forward-order current at end, U1c、I1c、I3cIt respectively indicates and is handled based on measurement method three and step (b)
The power frequency positive sequence voltage and power frequency forward-order current of obtained first branch head end and the power frequency forward-order current of third branch.
In T-type wiring transmission line power frequency positive sequence impedance measurement method of the present invention, it is based in the step (a)
GPS technology carries out the synchronous data collection of the voltage signal and current signal of each branch.
In T-type wiring transmission line power frequency positive sequence impedance measurement method of the present invention, parsing in the step (b)
Power frequency positive sequence voltage and power frequency forward-order current include: the voltage signal and current signal for rapid (a) acquisition, using Fourier
Algorithm is filtered to obtain the power frequency component of each voltage signal and current signal, then carries out sequence and decompose to obtain three kinds of measurement sides
Power frequency positive sequence voltage and power frequency forward-order current corresponding to each voltage signal and current signal under formula.
In T-type wiring transmission line power frequency positive sequence impedance measurement method of the present invention, used in the step (a)
Measuring terminals carry out data acquisition respectively, and collected data are aggregated by modem or Ethernet upload
Heart computer, central computer execute step (b).
Implement T-type wiring transmission line power frequency positive sequence impedance measurement method of the invention, has the advantages that this hair
Bright measurement method is mainly based upon three kinds of independent measurement methods, obtains power frequency corresponding to each branch under different circuit structures
Positive sequence voltage and power frequency forward-order current, so that power frequency positive sequence impedance can be calculated in conjunction with the circuit structure under three kinds of measurement methods
Parameter.Three kinds of measurement methods of the present invention are easily achieved, convenient and simple, are being suitable for all T-type wiring transmission lines just
The measurement of sequence impedance parameter, once it is determined that positive sequence impedance, then power frequency positive sequence resistance and power frequency forward-sequence reactance can also determine simultaneously,
It can be realized while measuring power frequency positive sequence resistance and the power frequency forward-sequence reactance of T-type connection circuitry；Further, the present invention can base
In the voltage and current signals of each branch of GPS technology synchronous acquisition synchronization different substation, guarantee the accurate of measurement result
Property, solve the problems, such as strange land signal measurement while property；Further, at using Fourier filtering algorithm and sequence decomposition method
Data collected are managed, the interference of harmonic wave and other order components is eliminated, improves measurement accuracy.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 a is the simulation model schematic diagram of measurement method one；
Fig. 1 b is the equivalent circuit structure schematic diagram of measurement method one；
Fig. 2 a is the simulation model schematic diagram of measurement method two；
Fig. 2 b is the equivalent circuit structure schematic diagram of measurement method two；
Fig. 3 a is the simulation model schematic diagram of measurement method three；
Fig. 3 b is the equivalent circuit structure schematic diagram of measurement method three.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
T-type wiring transmission line is made of the first branch of connection different substation, second branch, third branch, such as
Shown in Fig. 1 a, 2a, 3a, which is separately connected first, second, the third substation, and T-type wiring transmission line power frequency of the invention is just
Sequence impedance measurement method mainly includes data collection steps and data processing step.It is introduced respectively in detail below with reference to Fig. 1 a-3b
The realization of data collection steps and data processing step:
(a), data collection steps:
T-type wiring transmission line to be measured is had a power failure first, three kinds of methods of operation in table 1 is then successively executed, that is, holds
Three kinds of measurement methods of row, every kind of measurement method apply symmetrical three-phase main-frequency voltage in first branch head end respectively, and obtain each
The current signal and voltage signal of T-type wiring transmission line under measurement method.
1 three kinds of methods of operation of table
Wherein, measuring terminals are usually used in the step and carry out data acquisition, measuring terminals packet respectively in each measurement point
Include such as voltage transformer, current transformer, measuring terminals by collected data can by modem or with
Too online pass is aggregated into central computer, and central computer executes data processing step.
Preferably, data acquisition can be synchronized based on GPS technology, when GPS receiver receives 4 or more satellite informations
When, show that GPS time has synchronized；Each website starts the time with the synchronized sampling that each self-gauge terminal is arranged in software, and it is same to reach GPS
When the step sampling starting time, measurement starts.
Time reference of the error less than 1 μ s is obtained using the timing function of GPS technology, in the GPS time
It synchronizes down, while acquiring the three-phase voltage and three-phase current of each branch road, and be stored in measuring device in a manner of file；To mention
High measurement accuracy, it is preferred that data sampling rate of the invention generally should be more than 4000 points/second (4kHz), i.e., every power frequency period
Acquire at 80 points.
(b), data processing step:
The voltage signal obtained under every kind of measurement method of step (a) is parsed into corresponding power frequency positive sequence voltage and electricity
Stream signal resolution goes out corresponding power frequency forward-order current, and the circuit structure under three kinds of measurement methods is combined to calculate power frequency positive sequence impedance
Parameter.
Wherein, the voltage signal and current signal primarily with respect to rapid (a) acquisition are parsed, is filtered using Fourier algorithm
Wave handles to obtain the power frequency component of each voltage signal and current signal, then carries out sequence and decompose to obtain each electricity under three kinds of measurement methods
Press power frequency positive sequence voltage and power frequency forward-order current corresponding to signal and current signal.
The principle of the present invention is discussed in detail below with reference to three kinds of measurement methods:
Measurement method one:
It is the simulation model schematic diagram of measurement method one with reference to Fig. 1 a, by second branch end three-phase under the measurement method
It is shorted, is the equivalent circuit structure schematic diagram of measurement method one with reference to Fig. 1 b by third branch end difference three-phase open circuit, it can
See the first branch at this time and second branch series connection.
Measurement starts, and applies symmetrical three-phase main-frequency voltage in first branch head end, acquires the voltage of first branch head end
Signal and current signal, after the completion of data acquisition, collected data are stored on hard disk by each measuring terminals, when with GPS
Between for filename save, while by each route CT, bus PT no-load voltage ratio (because measuring terminals acquisition be by decompression after it is low
Voltage, so needing to calculate the voltage of armature winding side according to no-load voltage ratio), the corresponding text of information deposit such as channel number and gear
In part, the modulated demodulator of data or Ethernet upload are then aggregated into central computer, then to the voltage signal and electricity
Signal is flowed after the data processing of step (b), available corresponding power frequency positive sequence voltage and forward-order current, in Fig. 1 b
It is shown, U1a、I1aIt is illustrated respectively in current measurement method once, the work of obtained first branch head end is handled by step (b)
Frequency positive sequence voltage and power frequency forward-order current, Z1、Z2、Z3Indicate the power frequency positive sequence impedance of three branches.
Since the first branch and second branch are connected, then according to KVL law, current measurement method be can establish such as lower section
Journey:
U1a=I1a·(Z1+Z2) (A)
Measurement method two:
With reference to Fig. 2 a, it is the simulation model schematic diagram of measurement method two, distinguishes second branch end under the measurement method
Three-phase open circuit, third branch end three-phase is shorted, is the equivalent circuit structure schematic diagram of measurement method two with reference to Fig. 2 b, can
See the first branch at this time and the series connection of third branch.
Data acquisition control based on GPS refers to the introduction of above-mentioned measurement method one, and details are not described herein again.It is measured currently
Under mode, after measurement starts, applies symmetrical three-phase main-frequency voltage in first branch head end, acquire the voltage of first branch head end
Signal and current signal, the voltage signal and current signal are after the data processing of step (b), available corresponding power frequency
Positive sequence voltage and forward-order current, as shown in figure 2b, U1b、I1bIt is illustrated respectively under current measurement method two, by step
(b) the power frequency positive sequence voltage and power frequency forward-order current for the first branch head end that processing obtains.
Since the first branch and third branch are connected, then according to KVL law, current measurement method be can establish
Following equation: U1b=I1b·(Z1+Z3) (B)
Measurement method three:
With reference to Fig. 3 a, it is the simulation model schematic diagram of measurement method three, distinguishes second branch end under the measurement method
Three-phase is shorted, while third branch end difference three-phase being shorted, and is that the equivalent circuit structure of measurement method three shows with reference to Fig. 3 b
It is intended to, it is seen that second branch and the entirety of third branch circuit parallel connection are connected with the first branch again at this time.
Similarly, the data acquisition control based on GPS refers to the introduction of above-mentioned measurement method one, and details are not described herein again.Working as
Under preceding measurement method, after measurement starts, applies symmetrical three-phase main-frequency voltage in first branch head end, acquire first branch head end
Voltage signal and current signal and second branch current signal, all voltage signals and current signal pass through step (b)
Data processing after, available corresponding power frequency positive sequence voltage and forward-order current, as shown in figure 2b, U1c、I1c、I2cPoint
The power frequency positive sequence voltage and power frequency positive sequence for the first branch head end that Biao Shi not be obtained based on measurement method two and step (b) processing
The power frequency forward-order current of electric current and second branch.
Second branch and the entirety of third branch circuit parallel connection are connected with the first branch again, so current measurement method can establish
Following equation:
U1c=I1c·Z1+I2c·Z2 (C1)
Due to second branch and third branch circuit parallel connection, the pressure drop of second branch and third branch road is equal, so above-mentioned side
I in journey (C1)2c×Z2I can also be used3c×Z3Instead of therefore, under current measurement method, acquisition third branch can also be passed through
The current signal on road carrys out the current signal of replacement acquisition second branch, for example, being I with the power frequency forward-order current of third branch3cIt replaces
For the power frequency forward-order current I of second branch2cIt is as follows to establish equation group:
U1c=I1c·Z1+I3c·Z3 (C2)
It can be obtained with simultaneous about Z based on above-mentioned equation (A), (B), (C1)1、Z2、Z3Equation group (1), alternatively, can
Can be obtained with simultaneous about Z based on (A), (B), (C2)1、Z2、Z3Equation group (3).
Or
If be based on equation group (1), solving equations are available:
If be based on equation group (3), solving equations are available:
Due to the Z being finally calculated1、Z2、Z3It may be expressed as the form of following formula (2):
Zn=Rn+j·Xn (2)
ZnIndicate the power frequency positive sequence impedance for each branch that solving equations obtain, n=1,2,3 can according to Circuit theory knowledge
Know, R thereinnSubstantially correspond to the positive sequence resistance of branch, XnSubstantially correspond to the forward-sequence reactance of branch, therefore the present invention
It may finally realize power frequency positive sequence resistance and the power frequency forward-sequence reactance of determining T-type connection circuitry.If for example, being based on equation group
(D1) Z is calculated1Numerical value are as follows: 0.6935+j8.4640 Ω, then can directly determine power frequency positive sequence resistance be 0.6935 Ω
It is 8.4640 Ω with power frequency forward-sequence reactance.
It is described below a specific example, in the example, the electricity of voltage corresponding to each measurement method that emulation testing obtains
Flow data is respectively as follows:
Measurement method one: U1a=8+j0kV；I1a=0.0325-j0.3633kA；
Measurement method two: U1b=8+j0kV；I1b=0.0229-j0.3034kA；
Measurement method three: U1c=8+j0kV；I1c=0.0411-j0.4940kA；I2c=0.0261-j0.2812kA；
Above-mentioned numerical value is substituted into equation group (D1), each route power frequency positive sequence impedance can be calculated, compares set reason
By parameter, T-type wiring transmission line power frequency positive sequence impedance parameter measurements and relative error are calculated, as shown in table 2.
2 measurement result of table and relative error
From table 2 it can be seen that the power frequency positive sequence impedance parameter of measured three branches of T-type connection circuitry is all very quasi-
Really, relative error demonstrates the correctness of this method all within 0.6%.
In conclusion implementing T-type wiring transmission line power frequency positive sequence impedance measurement method of the invention, have beneficial below
Effect: measurement method of the invention is mainly based upon three kinds of independent measurement methods, obtains each branch institute under different circuit structures
Corresponding power frequency positive sequence voltage and power frequency forward-order current, so that work can be calculated in conjunction with the circuit structure under three kinds of measurement methods
Frequency positive sequence impedance parameter.Three kinds of measurement methods of the present invention are easily achieved, convenient and simple, are suitable for all T-type wiring
The measurement of electric transmission line positive sequence impedance parameter, once it is determined that positive sequence impedance, then power frequency positive sequence resistance and power frequency forward-sequence reactance
It can determine simultaneously, can be realized while measuring power frequency positive sequence resistance and the power frequency forward-sequence reactance of T-type connection circuitry；Further
, the present invention can guarantee to survey based on the voltage and current signals of each branch of GPS technology synchronous acquisition synchronization different substation
The accuracy for measuring result, solves the problems, such as strange land signal measurement while property；Further, using Fourier filtering algorithm and
Sequence decomposition method processing data collected, eliminate the interference of harmonic wave and other order components, improve measurement accuracy.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (4)
1. a kind of T-type wiring transmission line power frequency positive sequence impedance measurement method, the T-type wiring transmission line is by connecting different changes
The first branch in power station, second branch, third branch composition, which is characterized in that the described method includes:
(a), data collection steps: three kinds of measurement methods are successively executed after T-type wiring transmission line to be measured is had a power failure, for every
Kind measurement method applies symmetrical three-phase main-frequency voltage in first branch head end respectively, and three kinds of measurement methods include:
Measurement method one: second branch end three-phase being shorted, third branch end difference three-phase open circuit, and the acquisition first branch is first
The voltage signal and current signal at end；
Measurement method two: second branch end difference three-phase open circuit, third branch end three-phase are shorted, the acquisition first branch is first
The voltage signal and current signal at end；
Measurement method three: second branch and third branch end difference three-phase are shorted, the voltage of first branch head end is acquired
Signal and current signal and second branch/third branch current signal；
(b), the voltage signal obtained under every kind of measurement method of step (a) data processing step: is parsed into corresponding power frequency
Positive sequence voltage and current signal parse corresponding power frequency forward-order current, and combine the circuit structure meter under three kinds of measurement methods
Calculate power frequency positive sequence impedance parameter；
Wherein, if acquiring the current signal of second branch in the step (a) in measurement method three, in the step (b)
Calculating power frequency positive sequence impedance parameter includes:
(b11), based on power frequency positive sequence voltage, power frequency forward-order current and the circuit structure Simultaneous Equations under three kinds of measurement methods
(1), it solves and obtains the power frequency positive sequence impedance of three branches are as follows:
(b12), three branch are determined based on the power frequency positive sequence impedance and formula (2) that solution obtains three branches in step (b11)
The positive sequence resistance on road and forward-sequence reactance；
Zn=Rn+j·Xn, n=1,2,3 (2)
Wherein, ZnIndicate the power frequency positive sequence impedance of branch, RnIndicate the positive sequence resistance of branch, XnIndicate the forward-sequence reactance of branch,
U1a、I1aRespectively indicate the power frequency positive sequence voltage of first branch head end obtained based on measurement method one and step (b) processing and
Power frequency forward-order current, U1b、I1bRespectively indicate the first branch head end obtained based on measurement method two and step (b) processing
Power frequency positive sequence voltage and power frequency forward-order current, U1c、I1c、I2cIt respectively indicates and is obtained based on measurement method three and step (b) processing
First branch head end power frequency positive sequence voltage and power frequency forward-order current and second branch power frequency forward-order current；
Wherein, if acquiring the current signal of third branch in the step (a) in measurement method three, in the step (b)
Calculating power frequency positive sequence impedance parameter includes:
(b21), based on power frequency positive sequence voltage, power frequency forward-order current and the circuit structure Simultaneous Equations under three kinds of measurement methods
(3), it solves and obtains the power frequency positive sequence impedance parameter of three branches are as follows:
(b22), three branch are determined based on the power frequency positive sequence impedance and formula (2) that solution obtains three branches in step (b21)
The positive sequence resistance on road and forward-sequence reactance；
Zn=Rn+j·Xn, n=1,2,3 (2)
Wherein, ZnIndicate the power frequency positive sequence impedance of branch, RnIndicate the positive sequence resistance of branch, XnIndicate the forward-sequence reactance of branch,
U1a、I1aRespectively indicate the power frequency positive sequence voltage of first branch head end obtained based on measurement method one and step (b) processing and
Power frequency forward-order current, U1b、I1bRespectively indicate the first branch head end obtained based on measurement method two and step (b) processing
Power frequency positive sequence voltage and power frequency forward-order current, U1c、I1c、I3cIt respectively indicates and is obtained based on measurement method three and step (b) processing
First branch head end power frequency positive sequence voltage and power frequency forward-order current and third branch power frequency forward-order current.
2. T-type wiring transmission line power frequency positive sequence impedance measurement method according to claim 1, which is characterized in that described
The synchronous data collection of the voltage signal and current signal of each branch is carried out in step (a) based on GPS technology.
3. T-type wiring transmission line power frequency positive sequence impedance measurement method according to claim 1, which is characterized in that described
Parsing power frequency positive sequence voltage and power frequency forward-order current include: the voltage signal and electric current letter for rapid (a) acquisition in step (b)
Number, it is filtered to obtain the power frequency component of each voltage signal and current signal using Fourier algorithm, then carry out sequence decomposition
Obtain power frequency positive sequence voltage and power frequency forward-order current corresponding to each voltage signal and current signal under three kinds of measurement methods.
4. T-type wiring transmission line power frequency positive sequence impedance measurement method according to claim 1, which is characterized in that described
Data acquisition is carried out respectively using measuring terminals in step (a), and collected data are passed through into modem or ether
Online pass is aggregated into central computer, and central computer executes step (b).
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