CN105807140B - A kind of super-pressure is aerial-cable mixed power transmission line order parameter measurement method - Google Patents
A kind of super-pressure is aerial-cable mixed power transmission line order parameter measurement method Download PDFInfo
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- CN105807140B CN105807140B CN201610079384.XA CN201610079384A CN105807140B CN 105807140 B CN105807140 B CN 105807140B CN 201610079384 A CN201610079384 A CN 201610079384A CN 105807140 B CN105807140 B CN 105807140B
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The present invention relates to a kind of super-pressure aerial cable joint line order parameter measurement method, positive sequence parameter measurement includes：System load flow can change according to the demand of scheduling portion, measured twice before and after variation and obtain joint line both sides three-phase voltage, electric current phasor, find out positive sequence voltage, the forward-order current of the both sides measured twice；Seek the T-type equivalent circuit positive sequence impedance parameter of joint line all fronts；Acquire the T-type equivalent circuit positive sequence admittance parameter of overhead line section and the T-type equivalent circuit positive sequence admittance parameter of power cable section；Acquire the T-type equivalent circuit positive sequence impedance parameter of overhead line section and the T-type equivalent circuit positive sequence impedance parameter of power cable section；Acquire the positive sequence impedance and positive sequence admittance parameter of the unit length of overhead line and power cable.The measurement method of the present invention has very high accuracy.
Description
Technical field
The present invention relates to power system measuring technical fields, and in particular to super-pressure makes somebody a mere figurehead-cable mixed power transmission line sequence
Measurement method of parameters.
Background technology
Super-pressure is aerial-and cable mixed power transmission line has economy in terms of city load center and across Jiang Hai transmission of electricity
Property, the advantages such as reliability, thus obtained commonly used in modern electric construction and electric network reconstruction and promoted.Accurately circuit
Parameter is the basis that system carries out Load flow calculation, relay protection setting, fault localization etc..The manufacture ginseng of circuit is commonly used in engineering
Number is calculated, and can inevitably cause larger error in this way.Because after the completion of circuit is built, the parameter of circuit can be with environment temperature
The variation of the factors such as degree, weather, soil and change, given parameter has occurred and that larger when line parameter circuit value is compared to manufacture
Variation.Because of the difference of each section parameter of mixed power transmission line, traditional single homogeneous line calculation method of parameters can not join it
Number carries out accurate calculation.
Invention content
In view of the super-pressure overhead lines combined with cable parameter measurement mentioned in background technology, there are problem, the present invention
It is proposed that a kind of super-pressure makes somebody a mere figurehead-cable mixed power transmission line order parameter measurement method.The present invention is fully considering joint line ginseng
It on the basis of number characteristic, is calculated using distributed constant, proposes overhead lines combined with cable order parameter measurement method.
In order to achieve the above objectives, technical scheme is as follows：
A kind of super-pressure is aerial-cable hybrid line order parameter measurement method, positive sequence parameter measurement includes the following steps：
Step A：When joint line normal operation, system load flow can change according to the demand of scheduling portion, variation
Front and back measure twice obtains joint line both sides M, N-terminal point three-phase voltage, electric current phasor, and two are found out respectively with symmetrical component method
Positive sequence voltage, the forward-order current of the both sides M, N of secondary measurement be respectively
Step B：According to circuit theory, the T-type equivalent circuit positive sequence impedance parameter Z of joint line all fronts1′、Z2' and Z3' ask
Go out as follows
Step C：The positive sequence capacitance of known electric power cable sections all fronts is k times of the positive sequence capacitance of overhead line section all fronts,
The T-type equivalent circuit positive sequence admittance parameter Y of overhead line sectionOH1And the T-type equivalent circuit positive sequence admittance parameter of power cable section
YCb1It finds out as follows
Step D：It enablesWithThe T-type equivalent circuit positive sequence impedance parameter Z of overhead line sectionOH1And
The T-type equivalent circuit positive sequence impedance parameter Z of power cable sectionCb1, find out as follows
Step E：The positive sequence impedance z of the unit length of overhead line and power cableOH1、zCb1With positive sequence admittance parameter yOH1、
yCb1It finds out as follows
Wherein, lOHIndicate the length of overhead line section, lCbIndicate that the length of power cable section, arsinh () indicate
Counter-hyperbolic sine function.
Compared with prior art, the beneficial effects of the present invention are：
1. the measurement method of parameters can realize super-pressure it is aerial-measurement of cable hybrid line parameter, and utilize distribution
Parameter is calculated, and has very high accuracy；
Exist with the order parameter measurement of power cable section 2. this method is suitable for super-pressure joint line overhead line section
Line measures, therefore has higher practicability.
Description of the drawings
Fig. 1 is two section joint line schematic diagrames；
Fig. 2 is the positive sequence distributed constant equivalent circuit of joint line；
Fig. 3 is the positive sequence T-type equivalent circuit of joint line segmentation；
Fig. 4 is the equivalent transformations circuit diagram of joint line；
Fig. 5 is the positive sequence T-type equivalent circuit diagram of joint line.
Specific implementation mode
In order to overcome the shortcomings of that existing measuring technique, the present invention provide one kind and making somebody a mere figurehead-cable mixing transmission of electricity for super-pressure
The method that circuit order parameter measures, this method be suitable for the positive sequence of joint line overhead line section and power cable section, negative phase-sequence,
The on-line measurement of Zero sequence parameter, and calculated using distributed constant, therefore there is higher accuracy and practicability.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that：
Super-pressure makes somebody a mere figurehead-cable hybrid line order parameter measurement method, and wherein order parameter includes positive order parameter, negative phase-sequence ginseng
Number, Zero sequence parameter.By taking positive sequence parameter measurement as an example, the scheme specific derivation process is as follows：
(1) overhead line section length is lOH, power cable section length is lCbAerial-cable mixed power transmission line see
The positive sequence distributed constant equivalent circuit of Fig. 1, joint line are shown in Fig. 2, if the positive sequence impedance of overhead line unit length and positive sequence admittance
Respectively zOH1=rOH1+jωLOH1, yOH1=gOH1+jωCOH1；If positive sequence impedance and the positive sequence admittance of power cable unit length
Respectively zCb1=rCb1+jωLCb1, yCb1=gCb1+jωCCb1.Super-pressure joint line overhead line section and power cable section
Conductance be approximately 0, sectional is equivalent to T-type equivalent circuit and sees Fig. 3.
The parameter of overhead line section T-type equivalent circuit finds out as follows
Wherein,For the positive sequence propagation constant of overhead line,
For the positive sequence wave impedance of overhead line, sh () indicates that hyperbolic sine function, ch () indicate hyperbolic cosine function.
The parameter of power cable section T-type equivalent circuit finds out as follows
Wherein,For the positive sequence propagation constant of power cable,
For the positive sequence wave impedance of power cable.
(2) in step (1), Fig. 3 equivalent circuitsYOH1And YCb1It is triangle, triangle is carried out to it
Shape-star equivalent transformation, the equivalent transformations circuit after transformation are shown in Fig. 4, line parameter circuit value Z3、Z4、Z5It finds out as follows
Wherein,
(3) in step (2), merge line parameter circuit value Z respectively3WithZ4WithObtain joint line T-type equivalent circuit
See Fig. 5, line parameter circuit value Z1′、Z2′、Z3′。
(4) when joint line normal operation, system load flow can change according to the demand of scheduling portion, before and after variation
It measures twice and obtains joint line both sides M, N-terminal point three-phase voltage, electric current phasor, find out with symmetrical component method and survey twice respectively
Positive sequence voltage, the forward-order current of the both sides M, N of amount be respectively
(5) according to circuit theory, the T-type equivalent circuit positive sequence impedance parameter Z of joint line all fronts1′、Z2' and Z3' find out
It is as follows
(6) the positive sequence capacitance of electric power cable sections all fronts known to is k times of the positive sequence capacitance of overhead line section all fronts, is maked somebody a mere figurehead
The T-type equivalent circuit positive sequence admittance parameter Y of line sectionOH1And the T-type equivalent circuit positive sequence admittance parameter Y of power cable sectionCb1
It finds out as follows
(7) it enablesWithThe T-type equivalent circuit positive sequence impedance parameter Z of overhead line sectionOH1And electricity
The T-type equivalent circuit positive sequence impedance parameter Z of power cable sectionsCb1, find out as follows
(8) the positive sequence impedance z of the unit length of overhead line and power cableOH1、zCb1With positive sequence admittance parameter yOH1、yCb1It asks
Go out as follows
Wherein, arsinh () indicates counter-hyperbolic sine function.
Provided by the present invention for super-pressure it is aerial-method that measures of cable mixed power transmission line order parameter, this method is suitable
For the on-line measurement of joint line overhead line section and the positive sequence, negative phase-sequence, Zero sequence parameter of power cable section, and utilize distribution
Parameter is calculated, therefore has higher accuracy and practicability.
Claims (1)
1. a kind of super-pressure makes somebody a mere figurehead-cable hybrid line order parameter measurement method, positive sequence parameter measurement includes the following steps：
Step A：When joint line normal operation, system load flow can change according to the demand of scheduling portion, before and after variation
It measures twice and obtains joint line both sides M, N-terminal point three-phase voltage, electric current phasor, find out with symmetrical component method and survey twice respectively
Positive sequence voltage, the forward-order current of the both sides M, N of amount be respectively
Step B：According to circuit theory, the T-type equivalent circuit positive sequence impedance parameter Z of joint line all fronts1′、Z2' and Z3' find out as
Under
Step C：The positive sequence capacitance of known electric power cable sections all fronts is k times of the positive sequence capacitance of overhead line section all fronts, is maked somebody a mere figurehead
The T-type equivalent circuit positive sequence admittance parameter Y of line sectionOH1And the T-type equivalent circuit positive sequence admittance parameter Y of power cable sectionCb1
It finds out as follows
Step D：It enablesWithThe T-type equivalent circuit positive sequence impedance parameter Z of overhead line sectionOH1And electric power
The T-type equivalent circuit positive sequence impedance parameter Z of cable sectionsCb1, find out as follows
Step E：The positive sequence impedance z of the unit length of overhead line and power cableOH1、zCb1With positive sequence admittance parameter yOH1、yCb1It asks
Go out as follows
Wherein, lOHIndicate the length of overhead line section, lCbIndicate that the length of power cable section, arsinh () indicate anti-hyperbolic
SIN function.
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| CN107153142B (en) * | 2017-05-23 | 2020-01-07 | 武汉大学 | Three-phase asymmetric T-shaped power transmission line parameter measurement method |
| CN109932567B (en) * | 2019-03-27 | 2021-02-02 | 国网山东省电力公司青岛供电公司 | Passive measurement method for parameters of overhead transmission line |
| CN111030063B (en) * | 2019-12-09 | 2022-02-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Segmented time domain capacitance current compensation method |
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