CN103592572A - Method for direct current grounding electrode line fault distance measurement through intersecting line positioning of direct current component and harmonic component - Google Patents
Method for direct current grounding electrode line fault distance measurement through intersecting line positioning of direct current component and harmonic component Download PDFInfo
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Abstract
The invention relates to a method for direct current grounding electrode line fault distance measurement through intersecting line positioning of a direct current component and a harmonic component and belongs to the technical field of electric system distance measurement. The method comprises the steps that when a grounding electrode line breaks down, a grounding electrode lead measurement end voltage direct current component and direct current components of two returning outgoing line currents are respectively measured in real time, a function relationship between fault distance and transition resistance is obtained through a direct current component method, a function relationship between the fault distance and transition resistance is obtained through a harmonic component method, and the fault point position satisfying the two function relationships at the same time is determined according to a function relationship curve of the direct current component and a function relationship curve of the harmonic component. According to the method for direct current grounding electrode line fault distance measurement through intersecting line positioning of the direct current component and the harmonic component, single-ended information content of a line is used, the principle is simple, the sampling rate is low, and the method is convenient to achieve; the direct current component and the harmonic component are combined, certain interference resistant capacity is achieved, and the method is slightly influenced by the transition resistance.
Description
Technical field
The present invention relates to a kind of direct current grounding pole line fault distance-finding method that utilizes DC component and harmonic component intersection location, belong to electric system ranging technology field.
Background technology
Earthing pole is an indispensable part in DC transmission system.Ground electrode circuit voltage is lower, through area, mostly be mountain area, line fault probability occur larger, after ground electrode circuit breaks down, can affect DC bipolar system, not only larger on straight-flow system safe operation impact, and very large on the key rack stable operation impact of large electrical network.For guaranteeing key power grid operation, in the urgent need to a kind of new distance-finding method, determine abort situation, the fault localization based on existing transient fault recorder device basic can overcome the deficiency of above-mentioned travelling wave ranging.
The ground electrode circuit fault distance-finding method that utilizes DC component, antijamming capability is strong, but it is larger affected by transition resistance.It is little that the method for utilizing harmonic wave dominant frequency composition to carry out ground electrode circuit fault localization is affected by transition resistance, but poor anti jamming capability.Utilize the location algorithm of DC component and harmonic component simultaneously, can make up above deficiency.
Summary of the invention
The technical problem to be solved in the present invention is to utilize fault distance that DC component method and harmonic component method obtain respectively and two funtcional relationships of transition resistance, and the point that simultaneously meets these two funtcional relationships is trouble spot.Function relation curve with this according to fault distance and transition resistance in DC component and harmonic component is determined fault distance.
Technical scheme of the present invention is: a kind of direct current grounding pole line fault distance-finding method that utilizes DC component and harmonic component intersection location, when ground electrode circuit breaks down, survey respectively earthing pole lead-in wire measuring end voltage DC component and two and return back out the DC component of line current, by DC component method, obtain the funtcional relationship of fault distance and transition resistance, by harmonic component method, obtain again the funtcional relationship of fault distance and transition resistance, according to the function relation curve of DC component and harmonic component, determine the position of failure point that simultaneously meets these two funtcional relationships.
Its concrete steps are as follows:
(1) extract earthing pole lead-in wire measuring end voltage DC component
u mand two DC component that returns back out line current
i de1,
i de2, utilize DC component method, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain:
In formula,
u mfor measuring end voltage DC component,
i de1for regular link measuring end current dc component,
i de2for faulty line measuring end current dc component,
i 6for the DC component of downstream, trouble spot electric current,
x f for calculating fault distance,
rfor circuit resistance per unit length,
lfor ground electrode circuit total length.
According to failure boundary condition:
In formula,
u f for fault point voltage DC component,
u g for utmost point location voltage DC component,
i 3,
i 4,
i 5,
i 6for the ground electrode circuit DC component of electric current everywhere,
r g for utmost point location resistance,
r f for fault resistance.
The above various fault distance that obtains of simultaneous
x f with transition resistance
r f between relation as follows:
For above formula, if substitution fault distance
x f for true fault distance value, the transition resistance obtaining
r f it should be also actual transition resistance value.
(2) extract the leading harmonic component of earthing pole lead-in wire measuring end voltage
and two leading harmonic component that returns back out line current
,
, utilize harmonic component, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, by earthing pole two, return back out line and calculate respectively utmost point location point voltage, it is as follows that both equal columns are write equation:
In formula,
for the leading harmonic component of measuring end voltage,
for the leading harmonic component of regular link measuring end electric current,
for the leading harmonic component of faulty line measurement electric current,
for the leading harmonic component of downstream, trouble spot electric current,
lfor unit length inductance.
According to failure boundary condition:
（5）
In formula,
for the leading harmonic component of fault point voltage,
for the leading harmonic component of utmost point location voltage,
,
,
,
for the ground electrode circuit leading harmonic component of electric current everywhere.
Consider that transition resistance is pure resistive, by the above various fault distance that obtains
x f with transition resistance
r f between relation as follows:
(3) point of all setting up for above two funtcional relationships (formula (3), (6)) is trouble spot.According to the intersection point of the function relation curve of fault distance and transition resistance in DC component and harmonic component, be trouble spot, determine abort situation.
Principle of the present invention is: in the fault network model of analysis grounding polar curve road, find, in ground electrode circuit fault localization problem, have two unknown numbers, one is fault distance, and another is transition resistance.Utilize DC component method and harmonic component method can obtain respectively two funtcional relationships of fault distance and transition resistance, the point that simultaneously meets these two funtcional relationships is trouble spot.According to the function relation curve of fault distance and transition resistance in DC component and harmonic component, determine fault distance, with this, realize the range finding of direct current grounding pole line fault.
The invention has the beneficial effects as follows:
(1) the present invention is the single-ended quantity of information of having utilized circuit, and principle is simple, and sampling rate is lower, convenient realization.
(2) the present invention adopts DC component and harmonic component to think combination, has certain antijamming capability, and is subject to the impact of transition resistance less.
Accompanying drawing explanation
Fig. 1 is the direct current grounding pole line fault range measurement system schematic diagram in the present invention: in figure,
u mfor current conversion station neutral bus voltage (earthing pole measuring end voltage);
i de1,
i de2be respectively earthing pole two and return back out line current (measuring end electric current).
Fig. 2 is in the embodiment of the present invention 1, utilizes the fault distance of DC component and the function relation figure of transition resistance.
x f / km represents distance/km,
r f / Ω represents transition resistance/Europe.
Fig. 3 is in the embodiment of the present invention 1, utilizes the fault distance of harmonic component and the function relation figure of transition resistance.
x f / km represents distance/km,
r f / Ω represents transition resistance/Europe.
Fig. 4, for in the embodiment of the present invention 1, utilizes the fault distance of DC component and harmonic wave and the function relation figure of transition resistance simultaneously.
x f / km represents distance/km,
r f / Ω represents transition resistance/Europe.Intersection point is trouble spot.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1:
800kV direct current grounding pole circuit as shown in Figure 1.Its line parameter circuit value is as follows: total track length 80km, DC impedance is: 0.023165 Ω/km, utmost point location resistance is 0.2 Ω.Data sampling rate is 6.4kHz.Ground electrode circuit
l 2apart from measuring end 60km, earth fault occurs, transition resistance is respectively 4 Ω.
This utilizes the direct current grounding pole line fault distance-finding method of DC component and harmonic component intersection location to be characterised in that concrete steps are as follows:
(1) extract earthing pole lead-in wire measuring end voltage DC component
u mand two DC component that returns back out line current
i de1,
i de2, utilize DC component method, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain:
In formula,
u mfor measuring end voltage DC component,
i de1for regular link measuring end current dc component,
i de2for faulty line measuring end current dc component,
i 6for the DC component of downstream, trouble spot electric current,
x f for calculating fault distance,
rfor circuit resistance per unit length,
lfor ground electrode circuit total length.
According to failure boundary condition:
In formula,
u f for fault point voltage DC component,
u g for utmost point location voltage DC component,
i 3,
i 4,
i 5,
i 6for the ground electrode circuit DC component of electric current everywhere,
r g for utmost point location resistance,
r f for fault resistance.
The above various fault distance that obtains of simultaneous
x f with transition resistance
r f between relation as follows:
For above formula, if substitution fault distance
x f for true fault distance value, the transition resistance obtaining
r f it should be also actual transition resistance value.
(2) extract the leading harmonic component of earthing pole lead-in wire measuring end voltage
and two leading harmonic component that returns back out line current
,
, utilize harmonic component, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, by earthing pole two, return back out line and calculate respectively utmost point location point voltage, it is as follows that both equal columns are write equation:
（4）
In formula,
for the leading harmonic component of measuring end voltage,
for the leading harmonic component of regular link measuring end electric current,
for the leading harmonic component of faulty line measurement electric current,
for the leading harmonic component of downstream, trouble spot electric current,
lfor unit length inductance.
According to failure boundary condition:
In formula,
for the leading harmonic component of fault point voltage,
for the leading harmonic component of utmost point location voltage,
,
,
,
for the ground electrode circuit leading harmonic component of electric current everywhere.
Consider that transition resistance is pure resistive, by the above various fault distance that obtains
x f with transition resistance
r f between relation as follows:
(3) point of all setting up for above two funtcional relationships (formula (3), (6)) is trouble spot.According to the intersection point of the function relation curve of fault distance and transition resistance in DC component and harmonic component, be trouble spot, determine abort situation.
By simulation analysis, can obtain: the funtcional relationship of utilizing fault distance that DC component method obtains and transition resistance by formula (2) as shown in Figure 2.The funtcional relationship of utilizing fault distance that harmonic component method obtains and transition resistance by formula (4) as shown in Figure 3.In Fig. 2 and Fig. 3, can to obtain calculating fault distance be 60.15km to two intersections of complex curve, and error is 0.15km, as shown in Figure 4.
Embodiment 2:
800kV direct current grounding pole circuit as shown in Figure 1.Its line parameter circuit value is as follows: total track length 80km, DC impedance is: 0.023165 Ω/km, utmost point location resistance is 0.2 Ω.Data sampling rate is 6.4kHz.Ground electrode circuit
l 2apart from measuring end 40km, earth fault occurs, transition resistance is respectively 2 Ω.
This utilizes the direct current grounding pole line fault distance-finding method of DC component and harmonic component intersection location to be characterised in that concrete steps are as follows:
(1) extract earthing pole lead-in wire measuring end voltage DC component
u mand two DC component that returns back out line current
i de1,
i de2, utilize DC component method, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain:
In formula,
u mfor measuring end voltage DC component,
i de1for regular link measuring end current dc component,
i de2for faulty line measuring end current dc component,
i 6for the DC component of downstream, trouble spot electric current,
x f for calculating fault distance,
rfor circuit resistance per unit length,
lfor ground electrode circuit total length.
According to failure boundary condition:
In formula,
u f for fault point voltage DC component,
u g for utmost point location voltage DC component,
i 3,
i 4,
i 5,
i 6for the ground electrode circuit DC component of electric current everywhere,
r g for utmost point location resistance,
r f for fault resistance.
The above various fault distance that obtains of simultaneous
x f with transition resistance
r f between relation as follows:
（3）
For above formula, if substitution fault distance
x f for true fault distance value, the transition resistance obtaining
r f it should be also actual transition resistance value.
(2) extract the leading harmonic component of earthing pole lead-in wire measuring end voltage
and two leading harmonic component that returns back out line current
,
, utilize harmonic component, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, by earthing pole two, return back out line and calculate respectively utmost point location point voltage, it is as follows that both equal columns are write equation:
In formula,
for the leading harmonic component of measuring end voltage,
for the leading harmonic component of regular link measuring end electric current,
for the leading harmonic component of faulty line measurement electric current,
for the leading harmonic component of downstream, trouble spot electric current,
lfor unit length inductance.
According to failure boundary condition:
In formula,
for the leading harmonic component of fault point voltage,
for the leading harmonic component of utmost point location voltage,
,
,
,
for the ground electrode circuit leading harmonic component of electric current everywhere.
Consider that transition resistance is pure resistive, by the above various fault distance that obtains
x f with transition resistance
r f between relation as follows:
(3) point of all setting up for above two funtcional relationships (formula (3), (6)) is trouble spot.According to the intersection point of the function relation curve of fault distance and transition resistance in DC component and harmonic component, be trouble spot, determine abort situation.
By emulation experiment, can obtain: calculating fault distance is 41.26km, error is 0.26km.
Embodiment 3:
800kV direct current grounding pole circuit as shown in Figure 1.Its line parameter circuit value is as follows: total track length 80km, DC impedance is: 0.023165 Ω/km, utmost point location resistance is 0.2 Ω.Data sampling rate is 1MHz.Ground electrode circuit
l 2apart from measuring end 70km, earth fault occurs, transition resistance is respectively 2 Ω.
This utilizes the direct current grounding pole line fault distance-finding method of DC component and harmonic component intersection location to be characterised in that concrete steps are as follows:
(1) extract earthing pole lead-in wire measuring end voltage DC component
u mand two DC component that returns back out line current
i de1,
i de2, utilize DC component method, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain:
In formula,
u mfor measuring end voltage DC component,
i de1for regular link measuring end current dc component,
i de2for faulty line measuring end current dc component,
i 6for the DC component of downstream, trouble spot electric current,
x f for calculating fault distance,
rfor circuit resistance per unit length,
lfor ground electrode circuit total length.
According to failure boundary condition:
In formula,
u f for fault point voltage DC component,
u g for utmost point location voltage DC component,
i 3,
i 4,
i 5,
i 6for the ground electrode circuit DC component of electric current everywhere,
r g for utmost point location resistance,
r f for fault resistance.
The above various fault distance that obtains of simultaneous
x f with transition resistance
r f between relation as follows:
（3）
For above formula, if substitution fault distance
x f for true fault distance value, the transition resistance obtaining
r f it should be also actual transition resistance value.
(2) extract the leading harmonic component of earthing pole lead-in wire measuring end voltage
and two leading harmonic component that returns back out line current
,
, utilize harmonic component, according to impedance relationship, can obtain the funtcional relationship of fault distance and transition resistance:
When fault point voltage is higher than utmost point location point voltage, by earthing pole two, return back out line and calculate respectively utmost point location point voltage, it is as follows that both equal columns are write equation:
In formula,
for the leading harmonic component of measuring end voltage,
for the leading harmonic component of regular link measuring end electric current,
for the leading harmonic component of faulty line measurement electric current,
for the leading harmonic component of downstream, trouble spot electric current,
lfor unit length inductance.
According to failure boundary condition:
In formula,
for the leading harmonic component of fault point voltage,
for the leading harmonic component of utmost point location voltage,
,
,
,
for the ground electrode circuit leading harmonic component of electric current everywhere.
Consider that transition resistance is pure resistive, by the above various fault distance that obtains
x f with transition resistance
r f between relation as follows:
(3) point of all setting up for above two funtcional relationships (formula (3), (6)) is trouble spot.According to the intersection point of the function relation curve of fault distance and transition resistance in DC component and harmonic component, be trouble spot, determine abort situation.
By emulation experiment, can obtain: calculating fault distance is 70.29km, error is 0.29km.
From the emulation experiment of above-mentioned each example, this method can realize the direct current grounding pole line fault range finding that utilizes DC component and harmonic component intersection location effectively, reliably, and range finding result precision is higher.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (2)
1. a direct current grounding pole line fault distance-finding method that utilizes DC component and harmonic component intersection location, it is characterized in that: when ground electrode circuit breaks down, survey respectively earthing pole lead-in wire measuring end voltage DC component and two and return back out the DC component of line current, by DC component method, obtain the funtcional relationship of fault distance and transition resistance, by harmonic component method, obtain again the funtcional relationship of fault distance and transition resistance, according to the function relation curve of DC component and harmonic component, determine the position of failure point that simultaneously meets these two funtcional relationships.
2. the direct current grounding pole line fault distance-finding method that utilizes DC component and harmonic component intersection location according to claim 1, is characterized in that concrete steps are:
(1), when ground electrode circuit breaks down, survey respectively earthing pole lead-in wire measuring end voltage DC component
u mand two DC component that returns back out line current
i de1,
i de2, utilize DC component method, when fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain the funtcional relationship of fault distance and transition resistance by its impedance relationship:
In formula,
u mfor measuring end voltage DC component,
i de1for regular link measuring end current dc component,
i de2for faulty line measures current dc component,
x f for calculating fault distance,
rfor circuit resistance per unit length,
lfor ground electrode circuit total length,
r g for utmost point location resistance;
(2) extract the leading harmonic component of earthing pole lead-in wire measuring end voltage
and two leading harmonic component that returns back out line current
,
, utilize harmonic component, when fault point voltage is higher than utmost point location point voltage, return back out line according to two of earthing pole, the pressure drop from measuring end to utmost point location point equates, can obtain the funtcional relationship of fault distance and transition resistance by its impedance relationship:
In formula,
for the leading harmonic component of measuring end voltage,
for the leading harmonic component of regular link measuring end electric current,
for the leading harmonic component of faulty line measurement electric current,
lfor unit length inductance,
represent to get real;
(3) fault distance obtaining respectively according to DC component and harmonic component and the function relation curve between transition resistance are determined and are obtained fault distance by the position of failure point that simultaneously meets these two funtcional relationships.
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| CN105388392A (en) * | 2015-10-20 | 2016-03-09 | 北京交通大学 | DC power distribution cable single-end online fault positioning method based on apparent impedance identification |
| CN107024645A (en) * | 2017-05-24 | 2017-08-08 | 国网四川省电力公司电力科学研究院 | Ground electrode circuit over-voltage breakdown independent positioning method based on voltage oscillation frequency |
| CN109031049A (en) * | 2018-09-07 | 2018-12-18 | 昆明理工大学 | A kind of voltage DC ground electrode circuit fault distance measurement based on unilateral harmonic content |
| CN110514964A (en) * | 2019-09-05 | 2019-11-29 | 国网内蒙古东部电力有限公司检修分公司 | A kind of extra-high voltage DC transmission system ground electrode circuit fault distance-finding method |
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| CN107024645A (en) * | 2017-05-24 | 2017-08-08 | 国网四川省电力公司电力科学研究院 | Ground electrode circuit over-voltage breakdown independent positioning method based on voltage oscillation frequency |
| CN107024645B (en) * | 2017-05-24 | 2019-09-06 | 国网四川省电力公司电力科学研究院 | Ground electrode circuit over-voltage breakdown independent positioning method based on voltage oscillation frequency |
| CN109031049A (en) * | 2018-09-07 | 2018-12-18 | 昆明理工大学 | A kind of voltage DC ground electrode circuit fault distance measurement based on unilateral harmonic content |
| CN110514964A (en) * | 2019-09-05 | 2019-11-29 | 国网内蒙古东部电力有限公司检修分公司 | A kind of extra-high voltage DC transmission system ground electrode circuit fault distance-finding method |
| CN110514964B (en) * | 2019-09-05 | 2021-10-01 | 国网内蒙古东部电力有限公司检修分公司 | Fault location method for grounding electrode line of extra-high voltage direct current transmission system |
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| CN103592572B (en) | 2016-06-08 |
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