CN113193542B - Method for setting traveling wave protection fixed value of high-voltage direct current line - Google Patents
Method for setting traveling wave protection fixed value of high-voltage direct current line Download PDFInfo
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- CN113193542B CN113193542B CN202110471839.3A CN202110471839A CN113193542B CN 113193542 B CN113193542 B CN 113193542B CN 202110471839 A CN202110471839 A CN 202110471839A CN 113193542 B CN113193542 B CN 113193542B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/265—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured making use of travelling wave theory
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
Abstract
The invention discloses a method for setting a traveling wave protection fixed value of a high-voltage direct-current line, which comprises the following steps: setting simulation conditions for setting a traveling wave protection fixed value, wherein the simulation conditions comprise the transmission and transformation characteristics of a direct current voltage divider, the transition resistance during fault in a traveling wave protection area, the transition resistance during fault outside the traveling wave protection area, the fault position in the traveling wave protection area and the fault position outside the traveling wave protection area; building a simulation model, and performing fault simulation in and out of a traveling wave protection area to obtain traveling wave protection fault characteristic data under simulation conditions, wherein the traveling wave protection fault characteristic data comprises polar wave data and ground wave data; and processing the polar wave data and the ground wave data to obtain a polar wave setting value and a ground wave setting value. The invention provides a clear fixed value setting process aiming at all the criteria in the traveling wave protection, and improves the scientificity of the fixed value setting of the traveling wave protection. When the simulation condition is formulated, compared with the prior scheme, the influence of the transmission and transformation characteristics of the direct-current voltage divider on the amplitude of the traveling wave protection criterion is considered, and the reliability of the obtained fixed value is improved.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current transmission system protection, in particular to a method for setting a traveling wave protection fixed value of a high-voltage direct-current line.
Background
High-voltage direct-current transmission has the advantages of high transmission power, high stability, quick control response and the like, and is widely applied to long-distance and high-capacity transmission and power system networking at present. However, since the dc transmission line has various and complicated terrain and varied weather along the line, a fault of the high-voltage dc line occurs sometimes and has become an important factor affecting the stable operation of the high-voltage dc transmission system.
The traveling wave protection is used as the main protection of a high-voltage direct-current power transmission system line, pole wave criterion and ground wave criterion are calculated through fault voltage and current detected by a direct-current voltage divider and a current transformer, the calculated pole wave criterion amplitude and ground wave criterion amplitude are compared with a set pole wave fixed value and a set ground wave fixed value, and if the pole wave criterion amplitude and the ground wave criterion amplitude exceed the set fixed values, a fault is considered to occur in a protection area.
However, under the fault condition acted by the additional control system, the propagation characteristic of the electric quantity of the direct current line is difficult to study by adopting an analytic means, and the fault limit value used in the high-voltage direct current transmission protection constant value setting is difficult to obtain by an analytic fault analysis algorithm, so the traveling wave protection constant value setting is mainly realized by simulation at present. Some documents propose a scheme for determining the protection fixed value according to the simulation result aiming at the problem of the traveling wave protection fixed value setting, but have the problems of incomplete consideration of factors influencing the traveling wave protection fixed value setting, unclear specific setting flow and the like. In actual engineering, the traveling wave protection fixed value is usually a fixed value provided by a manufacturer and is adjusted through experience, and a system setting process is lacked. Therefore, the traveling wave protection often causes misoperation caused by unreasonable setting of the fixed value in the actual operation process.
Disclosure of Invention
The invention aims to provide a traveling wave protection constant value setting method for a high-voltage direct-current line, which has clear setting process and takes the factors influencing the traveling wave protection constant value setting into consideration.
The technical scheme for realizing the purpose of the invention is as follows:
a method for setting a traveling wave protection fixed value of a high-voltage direct current line comprises the following steps:
step 1: setting simulation conditions for setting a traveling wave protection fixed value, wherein the simulation conditions comprise the transmission and transformation characteristics of a direct current voltage divider, the transition resistance during fault in a traveling wave protection area, the transition resistance during fault outside the traveling wave protection area, the fault position in the traveling wave protection area and the fault position outside the traveling wave protection area;
step 2: building a simulation model, and performing fault simulation in and out of a traveling wave protection area to obtain traveling wave protection fault characteristic data under simulation conditions, wherein the traveling wave protection fault characteristic data comprises polar wave data and ground wave data;
and step 3: processing polar wave data to obtain a polar wave setting value: each time the internal fault simulation obtains an internal polar wave criterion amplitude (dP/dt)ImaxObtaining a group of polar wave criterion amplitude data set { (dP/dt) in the region after a plurality of times of simulationImaxThe minimum value in the set is taken { (dP/dt)Imax}minDivided by the reliability factor KrelObtaining a regional internal polar wave setting value (dP/dt)Iset(ii) a Each time of the out-of-region fault simulation obtains an out-of-region polar wave criterion amplitude (dP/dt)IImaxObtaining a group of external polar wave criterion amplitude data set { (dP/dt) after a plurality of times of simulationIImaxTaking the maximum value in the set as the external polar wave setting value { (dP/dt)IImax}max(ii) a If { (dP/dt)IImax}maxLess than (dP/dt)IsetThe polar wave setting value (dP/dt)setIs (dP/dt)Iset(ii) a If { (dP/dt)IImax}maxGreater than (dP/dt)IsetThe pole wave setting value is (dP/dt)set＝Krel{(dP/dt)IImax}max；
And 4, step 4: processing the ground wave data to obtain a ground wave setting value: each time the internal fault simulation obtains a ground wave criterion amplitude (delta G)maxAfter several times of simulation, a group of data sets (delta G) is obtainedmaxGet the minimum value in the set { (Δ G)max}minIf { (Δ G)max}minIf the current setting value is more than or equal to two times, the ground wave constant value continues to use the current setting value; if { (Δ G)max}minIf the current setting value is less than two times, the setting value of the ground wave is taken
The further technical scheme is as follows: the transfer characteristic of the direct current voltage divider is a transfer function H(s) of an equivalent circuit model of the direct current voltage divider,
H(s)＝H1(s)·H2(s)·H3(s)；
wherein the content of the first and second substances,
H1(s) is a first order body transfer function of the equivalent circuit model of the DC voltage divider,
H2(s) is a quadratic voltage divider plate transfer function of the DC voltage divider equivalent circuit model,
H3(s) is the electrical isolation device transfer function of the dc voltage divider equivalent circuit model,
where ζ is the second order Butterworth filter damping coefficient, ωnIs the second order Butterworth filter cutoff frequency;
the equivalent circuit model of the direct-current voltage divider consists of a primary body, a secondary voltage dividing plate and an electronic isolation device; wherein the primary body is composed of a resistor R1And a capacitor C1Parallel connection to form high-voltage bridge arm and resistor R2And a capacitor C2The high-voltage bridge arm is connected in series to the low-voltage bridge arm; the secondary voltage dividing plate is composed of a resistor R3And a capacitor C3Parallel connection to form high-voltage bridge arm and resistor R4And a capacitor C4The high-voltage bridge arm is connected in series to the low-voltage bridge arm; the electronic isolating device is of the second orderA Butterworth filter; the secondary voltage division plate is connected to the low-voltage bridge arm of the primary body, and the electronic isolation device is connected to the low-voltage bridge arm of the secondary voltage division plate.
Preferably, the fault location in the traveling wave protection zone is set as: a plurality of ground faults are uniformly arranged in the lines in the traveling wave protection area; the fault position outside the traveling wave protection area is set as follows: and carrying out protection constant value setting on the three-phase ground fault of the rectifying side alternating current bus of the pole, carrying out protection constant value setting on the ground fault at the outlet of the inversion side valve hall of the pole, and uniformly arranging a plurality of ground faults on a line without carrying out protection constant value setting on the pole.
Compared with the prior art, the invention has the beneficial effects that: 1) a clear fixed value setting flow is provided for each criterion in the traveling wave protection, and the scientificity of the fixed value setting of the traveling wave protection is improved. 2) When the simulation condition is formulated, compared with the prior scheme, the influence of the transmission and transformation characteristics of the direct-current voltage divider on the amplitude of the traveling wave protection criterion is considered, and the reliability of the obtained fixed value is improved.
Drawings
Fig. 1 is an equivalent circuit diagram of a dc voltage divider.
Fig. 2 is a schematic diagram of the setting of the simulated fault location in embodiment 1.
Fig. 3 is a schematic diagram of the setting of the simulated fault location in embodiment 2.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and examples.
A method for setting a traveling wave protection fixed value of a high-voltage direct current line comprises the following steps:
step 1: determining two key fixed values which need to be set in the traveling wave protection, namely an extreme wave fixed value and a ground wave fixed value.
In traveling wave protection, a polar wave criterion (dP/dt) is used for judging whether a fault occurs in a protection area, the dP/dt is obtained by carrying out difference calculation on polar waves, and the dP/dt is the difference between the current polar wave instantaneous value and the polar wave instantaneous value before 0.2 ms. The earth wave criterion (delta G) is used for distinguishing fault poles, and the delta G is the difference of the current earth wave instantaneous value and the earth wave instantaneous value before 1.7 ms. The protection range of the traveling wave protection is the total length of the local polar line, and each criterion is specifically as follows
Wherein, the calculation formula of polar wave and ground wave is as follows
In the formula: piA polar wave of the ith pole; g is ground wave; zαAnd Z0Polar wave impedance and ground wave impedance respectively; i.e. ielIs the earth electrode line current; u. ofdliThe voltage of the ith pole line; i.e. idliThe current of the ith pole line; i.e. iNiIs the ith electrode grounding electrode lead capacitance current.
Step 2: establishing a simulation condition for setting a traveling wave protection fixed value: and carrying out simulation analysis on three factors which influence the traveling wave protection constant value, namely the transmission and transformation characteristic, the transition resistance and the fault position of the direct-current voltage divider, obtaining the influence rule of the three factors on the protection constant value, namely the transmission and transformation characteristic, the transition resistance and the fault position of the direct-current voltage divider according to the simulation result, and establishing the simulation condition for setting the traveling wave protection constant value according to the influence rule.
The transmission and transformation characteristics of the direct current voltage divider can be obtained by carrying out field transfer function test on the direct current voltage divider; and the transfer characteristic can also be obtained by carrying out transfer function derivation on the equivalent model of the direct current transformer.
As shown in fig. 1, the equivalent circuit model of the dc voltage divider is composed of three parts, including a primary body of the dc voltage divider, a secondary voltage dividing plate of the dc voltage divider, and an electronic isolation device of the dc voltage divider. The primary body of the direct current voltage divider consists of a high-voltage bridge arm and a low-voltage bridge arm; high-voltage bridge arm is by resistance R1And a capacitor C1Are connected in parallel; low-voltage bridge arm resistance R2And a capacitor C2Are connected in parallel. The secondary voltage division plate of the direct current voltage divider consists of a high-voltage bridge arm and a low-voltage bridge arm; high-voltage bridge arm is by resistance R3And a capacitor C3Are connected in parallel; low-voltage bridge arm resistance R4And a capacitor C4Are connected in parallel. The electronic isolation device of the direct current voltage divider consists of a low-pass anti-aliasing filter, wherein the low-pass anti-aliasing filter is a second-order Butterworth filter, and the cut-off frequency is 3 kHz.
The transfer characteristic of the direct current voltage divider can be represented by a transfer function of the direct current voltage divider, and the transfer function of the direct current voltage divider can be obtained by cascading the transfer functions of three components in an equivalent circuit model of the direct current voltage divider.
The first order bulk transfer function of the DC voltage divider is
In the formula R1＝400MΩ，R2＝35kΩ，C1＝400pF，C2＝4571nF。
The transfer function of the secondary voltage division plate of the DC voltage divider is
In the formula R3＝900kΩ，R4＝69.23Ω，C3＝430pF，C4＝5590pF。
The electronic isolation device has a transfer function of
Where ζ is 0.707 and ω isn＝3000。
The transfer function of the direct current voltage divider is obtained by cascading the three transfer functions, wherein the transfer function of the direct current voltage divider is
H(s)＝H1(s)·H2(s)·H3(s)
The transfer characteristic of the direct current voltage divider can be characterized by H(s).
And step 3: and (3) building a simulation model according to actual parameters, performing fault simulation in a traveling wave protection area, and acquiring traveling wave protection fault characteristic data, namely polar wave data and ground wave data, under each simulation condition.
And 4, step 4: processing the obtained polar wave data to obtain a polar wave fixed value: each time the internal fault simulation obtains an internal polar wave criterion amplitude (dP/dt)ImaxObtaining a group of polar wave criterion amplitude data set { (dP/dt) in the region after a plurality of times of simulationImaxThe minimum value in the set is taken { (dP/dt)Imax}minDivided by the reliability factor KrelObtaining a regional internal polar wave setting value (dP/dt)Iset(ii) a Each time of the out-of-region fault simulation obtains an out-of-region polar wave criterion amplitude (dP/dt)IImaxObtaining a group of external polar wave criterion amplitude data set { (dP/dt) after a plurality of times of simulationIImaxTaking the maximum value in the set as the external polar wave setting value { (dP/dt)IImax}max(ii) a If { (dP/dt)IImax}maxLess than (dP/dt)IsetThe polar wave setting value (dP/dt)setIs (dP/dt)Iset(ii) a If { (dP/dt)IImax}maxGreater than (dP/dt)IsetThe pole wave setting value is (dP/dt)set＝Krel{(dP/dt)IImax}max。
And 5: processing the obtained ground wave data to obtain a ground wave fixed value: each time the zone internal fault simulation can obtain a ground wave criterion amplitude (delta G)maxAfter several times of simulation, a group of data set { (Δ G) can be formedmaxGet the minimum value in the set { (Δ G)max}minIf { (Δ G)max}minIf the current fixed value is two times or more, the current fixed value is used for the ground wave fixed value, if { (Δ G)max}minLess than twice the existing constant value, the ground wave constant value is taken as
In the formula: (Δ G)setThe value is fixed for the earth wave.
Step 6: and 3, carrying out in-region and out-region fault simulation in the simulation model set up in the step 3, and verifying the reliability of the protection setting value, namely verifying whether the traveling wave protection can protect the whole length of the polar line when the traveling wave protection adopts the setting value obtained by the text, and not acting when the out-region fault occurs.
Example 1
The invention is further elaborated by taking the parameters of a home dam-Shanghai +/-800 kV extra-high voltage direct-current transmission project as an example and building a PSCAD/EMTDC simulation model.
Firstly, setting simulation conditions for setting a traveling wave protection fixed value, including transmission and transformation characteristics of a direct current voltage divider, transition resistance and a fault position. The simulation conditions formulated in this embodiment are:
1) the traveling wave protection is characterized in that the amplitude of each criterion is influenced by the transmission characteristic of the direct current voltage divider;
2) the transition resistance is set to be 100 omega when the fault occurs in the area, and the transition resistance is set to be 0.1 omega when the fault occurs outside the area;
3) as shown in fig. 2, the intra-zone fault location is set to: and taking the pole 1 to carry out traveling wave protection fixed value setting, and setting an earth fault at each 10% of the length of the line from the head end of the line in the traveling wave protection area of the pole 1 to the tail end of the line (F1-F10, namely, a plurality of earth faults are uniformly set on the line in the traveling wave protection area). The out-of-range fault location is set to: three-phase ground fault of the rectifying side alternating current bus of the pole 1 (F11, namely three-phase ground fault of the rectifying side alternating current bus carrying out protection setting on the pole), ground fault at the outlet of the inverter side valve hall of the pole 1 (F12, namely ground fault at the outlet of the inverter side valve hall carrying out protection setting on the pole), ground faults at the head end of the line of the pole 2, 20%, 40%, 60%, 80% and 100% (F13-F18, namely multiple ground faults are uniformly arranged on the line without carrying out protection setting on the pole).
And secondly, building a simulation model, performing fault simulation in and out of the traveling wave protection area, and acquiring traveling wave protection fault characteristic data under the simulation condition, wherein the traveling wave protection fault characteristic data comprises polar wave data and ground wave data.
A simulation model is built according to parameters of the home dam-Shanghai +/-800 kV ultra-high voltage direct current transmission engineering, and specific parameters are shown in table 1.
TABLE 1
| Parameter and unit | Numerical value |
| Rated voltage/kV | 800 |
| Rated current/kA | 4 |
| Transmission Power/MW | 6400 |
| Line length/km | 1935 |
| Polar impedance/omega | 256.2 |
| Ground wave impedance/omega | 493.0 |
Thirdly, processing the polar wave data to obtain a polar wave setting value: each time the internal fault simulation obtains an internal polar wave criterion amplitude (dP/dt)ImaxObtaining a group of polar wave criterion amplitude data set { (dP/dt) in the region after a plurality of times of simulationImaxThe minimum value in the set is taken { (dP/dt)Imax}minDivided by the reliability factor KrelObtaining a regional internal polar wave setting value (dP/dt)Iset(ii) a Each time of out-of-region simulation obtains an out-of-region polar wave criterion amplitude (dP/dt)IImaxObtaining a group of external polar wave criterion amplitude data set { (dP/dt) after a plurality of times of simulationIImaxThe maximum value in the set is taken { (dP/dt)IImax}maxAnd (dP/dt)IsetBy comparison, if { (dP/dt)IImax}maxLess than (dP/dt)IsetThe polar wave setting value (dP/dt)setSize (dP/dt)IsetSize of (d), if { (dP/dt)IImax}maxGreater than (dP/dt)IsetThe setting value of the polar wave is (dP/dt)set＝Krel{(dP/dt)IImax}max。
The results of the polar wave data simulation are shown in table 2.
TABLE 2
| Location of failure | Polar amplitude/kV | Ground wave amplitude/kV | Location of failure | Polar amplitude/kV | Ground wave amplitude/kV |
| F1 | 449.2 | 355.7 | F10 | 198.7 | 301.5 |
| F2 | 290.1 | 352.1 | F11 | 37.6 | 207.1 |
| F3 | 269.1 | 341.6 | F12 | 56.7 | 192.1 |
| F4 | 249.5 | 337.2 | F13 | 147.3 | -361.4 |
| F5 | 223.9 | 329.9 | F14 | 124.6 | -348.2 |
| F6 | 215.0 | 325.3 | F15 | 113.0 | -341.0 |
| F7 | 212.4 | 319.2 | F16 | 107.3 | -338.9 |
| F8 | 208.6 | 313.8 | F17 | 101.8 | -334.7 |
| F9 | 201.7 | 307.2 | F18 | 97.2 | -330.3 |
After data processing, the result is { (dP/dt)Imax}min＝198.7kV，(dP/dt)IsetCan be calculated by the following formula;
in the formula: krelThe reliability factor was taken to be 1.1.
And due to { (dP/dt)IImax}max147.3kV, therefore (dP/dt)set＝(dP/dt)Iset＝180.6kV。
Fourthly, processing the ground wave data to obtain a ground wave setting value: each time the internal fault simulation obtains a ground wave criterion amplitude (delta G)maxAfter several times of simulation, a group of data sets (delta G) is obtainedmaxGet the minimum value in the set { (Δ G)max}minIf { (Δ G)max}minMore than or equal to two times of the existing setting value (the existing setting value of the ground wave is generally 0.1 times of the rated voltage), the existing setting value is used for the ground wave setting value, if { (delta G)max}minIf the current setting value is less than two times, the setting value of the ground wave is taken
The results of the ground wave data simulation are shown in table 3.
TABLE 3
The boundary value of the ground wave criterion amplitude obtained after data processing is shown as the following formula.
{(ΔG)max}min＝301.5kV
In the formula: { (Δ G)max}minIn order to consider the transmission and transformation characteristics of the voltage divider, the boundary value of the time wave criterion amplitude is far more than two times of the existing setting value (80kV), so the existing setting value is used as the ground wave setting value.
Example 2
The invention is further elaborated by establishing a PSCAD/EMTDC simulation model by taking Yunnan-Guangdong +/-800 kV extra-high voltage direct current transmission engineering parameters as reference.
Firstly, setting simulation conditions for setting a traveling wave protection fixed value, including transmission and transformation characteristics of a direct current voltage divider, transition resistance and a fault position. The simulation conditions formulated in this embodiment are:
1) the traveling wave protection is characterized in that the amplitude of each criterion is influenced by the transmission characteristic of the direct current voltage divider;
2) the transition resistance is set to be 120 omega when the fault occurs in the area, and the transition resistance is set to be 0.1 omega when the fault occurs outside the area;
3) as shown in fig. 3, the intra-zone fault location is set to: taking the pole 1 to carry out traveling wave protection fixed value setting, starting from the head end of the line in the traveling wave protection area of the pole 1 and ending at the tail end of the line, and setting a grounding fault (F19-F38) at every 5 percent of the length of the line; the out-of-range fault location is set to: the three-phase ground fault of the alternating current bus on the rectifying side of the pole 1 (F39), the ground fault at the outlet of the valve hall on the inverting side of the pole 1 (F40) and the ground fault arranged at the position of 10 percent of the line length of the line on the pole 2 (F41-F50) are adopted.
And secondly, building a simulation model, performing fault simulation in and out of the traveling wave protection area, and acquiring traveling wave protection fault characteristic data under the simulation condition, wherein the traveling wave protection fault characteristic data comprises polar wave data and ground wave data.
A simulation model is built according to the parameters of the Yunnan-Guangdong +/-800 kV extra-high voltage direct current transmission engineering, and the specific parameters are shown in table 4.
TABLE 4
| Parameter and unit | Numerical value |
| Rated voltage/kV | 800 |
| Rated current/kA | 3.125 |
| Transmission Power/MW | 5000 |
| Line length/km | 1438 |
| Polar impedance/omega | 256.2 |
| Ground wave impedance/omega | 493.0 |
Thirdly, processing the polar wave data to obtain a polar wave setting value: each time the internal fault simulation obtains an internal polar wave criterion amplitude (dP/dt)ImaxObtaining a group of polar wave criterion amplitude data sets in the region after a plurality of times of simulation{(dP/dt)ImaxThe minimum value in the set is taken { (dP/dt)Imax}minDivided by the reliability factor KrelObtaining a regional internal polar wave setting value (dP/dt)Iset(ii) a Each time of out-of-region simulation obtains an out-of-region polar wave criterion amplitude (dP/dt)IImaxObtaining a group of external polar wave criterion amplitude data set { (dP/dt) after a plurality of times of simulationIImaxThe maximum value in the set is taken { (dP/dt)IImax}maxAnd (dP/dt)IsetBy comparison, if { (dP/dt)IImax}maxLess than (dP/dt)IsetThe polar wave setting value (dP/dt)setSize (dP/dt)IsetSize of (d), if { (dP/dt)IImax}maxGreater than (dP/dt)IsetThe setting value of the polar wave is (dP/dt)set＝Krel{(dP/dt)IImax}max。
The results of the polar wave data simulation are shown in table 5.
TABLE 5
| Location of failure | Polar amplitude/kV | Ground wave amplitude/kV | Location of failure | Polar amplitude/kV | Ground wave amplitude/kV |
| F19 | 407.1 | 220.7 | F36 | 180.9 | 160.7 |
| F20 | 267.1 | 214.6 | F37 | 179.6 | 159.4 |
| F21 | 258.7 | 207.7 | F38 | 179.1 | 158.1 |
| F22 | 250.5 | 202.2 | F39 | 31.6 | 161.4 |
| F23 | 237.2 | 197.8 | F40 | 54.3 | 128.2 |
| F24 | 222.3 | 193.3 | F41 | 101.7 | -311.0 |
| F25 | 211.4 | 188.7 | F42 | 96.3 | -303.9 |
| F26 | 206.6 | 181.8 | F43 | 89.8 | -295.7 |
| F27 | 201.3 | 176.2 | F44 | 83.2 | -285.3 |
| F28 | 197.9 | 171.9 | F45 | 78.0 | -279.3 |
| F29 | 194.5 | 167.0 | F46 | 72.1 | -271.3 |
| F30 | 189.8 | 163.9 | F47 | 69.5 | -260.8 |
| F31 | 187.7 | 264.3 | F48 | 67.2 | -255.5 |
| F32 | 185.0 | 263.1 | F49 | 65.3 | -251.6 |
| F33 | 183.3 | 262.8 | F50 | 61.7 | -249.6 |
| F34 | 182.1 | 262.1 | |||
| F35 | 181.5 | 261.7 |
After data processing, the result is { (dP/dt)Imax}min＝179.1kV，(dP/dt)IsetCan be calculated by the following formula;
in the formula: (dP)I/dt)setPolar wave differential criterion setting value K for considering transmission and transformation characteristics of voltage dividerrelThe reliability factor was taken to be 1.1.
And due to { (dP/dt)IImax}max101.7kV, so (dP/dt)set＝(dP/dt)Iset＝162.8kV。
Fourthly, processing the ground wave data to obtain a ground wave setting value: each time the internal fault simulation obtains a ground wave criterion amplitude (delta G)maxAfter several times of simulation, a group of data sets (delta G) is obtainedmaxGet the minimum value in the set { (Δ G)max}minIf { (Δ G)max}minIf the current fixed value is two times or more, the current fixed value is used for the ground wave fixed value, if { (Δ G)max}minIf the current fixed value is less than two times, the earth wave set value is taken
The results of the ground wave data simulation are shown in table 6.
TABLE 6
The boundary value of the ground wave criterion amplitude obtained after data processing is shown as the following formula.
{(ΔG)max}min＝158.1kV
In the formula: { (Δ G)max}minThe boundary value of the amplitude of the time wave criterion for taking into account the transmission characteristics of the voltage divider is less than twice the existing constant value (80kV), so that the ground wave is constant
Claims (3)
1. A method for setting a traveling wave protection fixed value of a high-voltage direct current line is characterized by comprising the following steps:
step 1: setting simulation conditions for setting a traveling wave protection fixed value, wherein the simulation conditions comprise the transmission and transformation characteristics of a direct current voltage divider, the transition resistance during fault in a traveling wave protection area, the transition resistance during fault outside the traveling wave protection area, the fault position in the traveling wave protection area and the fault position outside the traveling wave protection area;
step 2: building a simulation model, and performing fault simulation in and out of a traveling wave protection area to obtain traveling wave protection fault characteristic data under simulation conditions, wherein the traveling wave protection fault characteristic data comprises polar wave data and ground wave data;
and step 3: processing polar wave data to obtain a polar wave setting value: each time the internal fault simulation obtains an internal polar wave criterion amplitude (dP/dt)ImaxObtaining a group of polar wave criterion amplitude data set { (dP/dt) in the region after a plurality of times of simulationImaxThe minimum value in the set is taken { (dP/dt)Imax}minDivided by the reliability factor KrelObtaining a regional internal polar wave setting value (dP/dt)Iset(ii) a Each time of the out-of-region fault simulation obtains an out-of-region polar wave criterion amplitude (dP/dt)IImaxObtaining a group of external polar wave criterion amplitude data set { (dP/dt) after a plurality of times of simulationIImaxTaking the maximum value in the set as the external polar wave setting value { (dP/dt)IImax}max(ii) a If { (dP/dt)IImax}maxLess than (dP/dt)IsetThe polar wave setting value (dP/dt)setIs (dP/dt)Iset(ii) a If { (dP/dt)IImax}maxGreater than (dP/dt)IsetThe pole wave setting value is (dP/dt)set＝Krel{(dP/dt)IImax}max；
And 4, step 4: processing the ground wave data to obtain a ground wave setting value: each time the internal fault simulation obtains a ground wave criterion amplitude (delta G)maxAfter several times of simulation, a group of data sets (delta G) is obtainedmaxGet the minimum value in the set { (Δ G)max}minIf { (Δ G)max}minIf the current setting value is more than or equal to two times, the ground wave constant value continues to use the current setting value; if { (Δ G)max}minIf the current setting value is less than two times, the setting value of the ground wave is taken
2. The method for setting the traveling wave protection fixed value of the HVDC line of claim 1, wherein the transmission characteristic of the DC voltage divider is a transfer function H(s) of an equivalent circuit model of the DC voltage divider,
H(s)＝H1(s)·H2(s)·H3(s)；
wherein the content of the first and second substances,
H1(s) is a first order body transfer function of the equivalent circuit model of the DC voltage divider,
H2(s) is a quadratic voltage divider plate transfer function of the DC voltage divider equivalent circuit model,
H3(s) is the electrical isolation device transfer function of the dc voltage divider equivalent circuit model,
where ζ is the second order Butterworth filter damping coefficient, ωnIs the second order Butterworth filter cutoff frequency;
the equivalent circuit model of the direct-current voltage divider consists of a primary body, a secondary voltage dividing plate and an electronic isolation device; wherein the primary body is composed of a resistor R1And a capacitor C1Parallel connection to form high-voltage bridge arm and resistor R2And a capacitor C2The high-voltage bridge arm is connected in series to the low-voltage bridge arm; the secondary voltage dividing plate is composed of a resistor R3And a capacitor C3Parallel connection to form high-voltage bridge arm and resistor R4And a capacitor C4The high-voltage bridge arm is connected in series to the low-voltage bridge arm; the electronic isolation device is a second-order Butterworth filter; the secondary voltage division plate is connected to the low-voltage bridge arm of the primary body, and the electronic isolation device is connected to the low-voltage bridge arm of the secondary voltage division plate.
3. The method for setting the traveling wave protection fixed value of the high-voltage direct current line according to claim 1 or 2, wherein the fault position in the traveling wave protection area is set as follows: a plurality of ground faults are uniformly arranged in the lines in the traveling wave protection area; the fault position outside the traveling wave protection area is set as follows: and carrying out protection constant value setting on the three-phase ground fault of the rectifying side alternating current bus of the pole, carrying out protection constant value setting on the ground fault at the outlet of the inversion side valve hall of the pole, and uniformly arranging a plurality of ground faults on a line without carrying out protection constant value setting on the pole.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267108A (en) * | 2008-03-17 | 2008-09-17 | 长沙理工大学 | Protection method for failure row wave network |
| CN101860020A (en) * | 2010-06-04 | 2010-10-13 | 昆明理工大学 | Method of boundary element utilizing polar wave S transform energy ratio to determine ultra high-voltage direct current transmission line fault |
| CN102280866A (en) * | 2011-02-10 | 2011-12-14 | 清华大学 | Traveling wave data acquisition and processing device |
| CN102882193A (en) * | 2012-09-28 | 2013-01-16 | 中国南方电网有限责任公司超高压输电公司 | Method and system for traveling wave protection setting of high-voltage direct-current transmission line |
| CN103580012A (en) * | 2013-11-14 | 2014-02-12 | 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 | High-voltage direct current transmission line self-adaptive travelling wave protection method |
| CN104538941A (en) * | 2014-12-16 | 2015-04-22 | 国家电网公司 | Traveling wave protection fixed value setting method for high-voltage direct-current transmission line |
| CN105375449A (en) * | 2015-11-12 | 2016-03-02 | 南方电网科学研究院有限责任公司 | Method and system for setting voltage change rate criterion of direct current line travelling wave protection |
| CN107431350A (en) * | 2015-03-30 | 2017-12-01 | Abb瑞士股份有限公司 | The traveling-wave protection of power transmission line |
| CN108199357A (en) * | 2018-01-17 | 2018-06-22 | 华北电力大学（保定） | A kind of method of DC power transmission line traveling-wave protection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016188568A1 (en) * | 2015-05-26 | 2016-12-01 | Abb Technology Ltd | Travelling wave protection of a transmission line based on high-pass filtering |
| US11038342B2 (en) * | 2017-09-22 | 2021-06-15 | Schweitzer Engineering Laboratories, Inc. | Traveling wave identification using distortions for electric power system protection |
-
2021
- 2021-04-29 CN CN202110471839.3A patent/CN113193542B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101267108A (en) * | 2008-03-17 | 2008-09-17 | 长沙理工大学 | Protection method for failure row wave network |
| CN101860020A (en) * | 2010-06-04 | 2010-10-13 | 昆明理工大学 | Method of boundary element utilizing polar wave S transform energy ratio to determine ultra high-voltage direct current transmission line fault |
| CN102280866A (en) * | 2011-02-10 | 2011-12-14 | 清华大学 | Traveling wave data acquisition and processing device |
| CN102882193A (en) * | 2012-09-28 | 2013-01-16 | 中国南方电网有限责任公司超高压输电公司 | Method and system for traveling wave protection setting of high-voltage direct-current transmission line |
| CN103580012A (en) * | 2013-11-14 | 2014-02-12 | 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 | High-voltage direct current transmission line self-adaptive travelling wave protection method |
| CN104538941A (en) * | 2014-12-16 | 2015-04-22 | 国家电网公司 | Traveling wave protection fixed value setting method for high-voltage direct-current transmission line |
| CN107431350A (en) * | 2015-03-30 | 2017-12-01 | Abb瑞士股份有限公司 | The traveling-wave protection of power transmission line |
| CN105375449A (en) * | 2015-11-12 | 2016-03-02 | 南方电网科学研究院有限责任公司 | Method and system for setting voltage change rate criterion of direct current line travelling wave protection |
| CN108199357A (en) * | 2018-01-17 | 2018-06-22 | 华北电力大学（保定） | A kind of method of DC power transmission line traveling-wave protection |
Non-Patent Citations (1)
| Title |
|---|
| Transfer Characteristics of DC Voltage Divider and Its Influence on Traveling Wave Protection;Xiaopeng Li et al,;《2020 12th IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)》;20201013;全文 * |
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