CN107817414A - Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal - Google Patents
Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal Download PDFInfo
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Abstract
The invention discloses the extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal, the described method comprises the following steps：S1：High frequency sinusoidal current signal is injected to extra-high voltage DC transmission system ground electrode circuit head end by signal injection device, the amplitude and phase of record current signal, measurement obtains same frequency voltage magnitude, the phase of signal decanting point simultaneously, calculates the phase difference of voltage and current；S2：The wave impedance of route parameter calculation ground electrode circuit in step S1；S3：The phase difference of the voltage magnitude, current amplitude, surge impedance of a line and the voltage and current that are obtained according to survey calculation in step S1, S2, calculates ground electrode circuit voltage standing wave ratio；S4：Failure is compared according to ground electrode circuit voltage standing wave(VSW) in step S3 to be identified.
Description
Technical field
The present invention relates to extra-high voltage DC transmission system ground electrode circuit Fault Identification field, and in particular to one kind is based on height
The extra-high voltage DC transmission system ground electrode circuit fault monitoring method of frequency voltage standing wave ratio.
Background technology
Extra-high voltage direct-current transmission technology has the advantages that transmission capacity is big, transmission distance is remote, control performance is strong, in electric energy
Very important effect is played in long-distance transmissions and regional power grid interconnection, wherein earthing pole is extra-high voltage DC transmission system
Important component, primarily serve and line residual current path be provided, establishes the effect such as system voltage reference point.With extra-high straightening
Flow power transmission engineering continuous construction and put into operation, earthing pole apart from current conversion station distance more than 100km, the protection to ground electrode circuit
Bring serious influence.In addition, when the bipolar balance movement of extra-high voltage DC transmission system or monopole-metallic return operation, connect
No current on the circuit of earth polar, great challenge is brought to the Fault Identification of ground electrode circuit and processing.At present, ground electrode circuit
Protection mainly has current imbalance protection and impedance monitoring strategy.Wherein, current imbalance protection is by detecting paired running
Current unbalance factor on two ground electrode circuits, identification earthing pole are led the way failure, have very strong sensitivity.But current imbalance
Protection is only used for monopole-Ground return method of operation, can not be under bipolar balance movement or the monopolar metallic return method of operation
Whether failure is identified is found to ground electrode circuit.
During to solve bipolar balance or monopolar metallic return operation, ground electrode circuit Fault Identification problem, there is scholar's proposition
Fault monitoring principle based on injection method, ground electrode circuit impedance is calculated by injecting high frequency sinusoidal signal, utilizes resistance
Anti- change identification failure.But the ground electrode circuit fault monitoring method based on impedance monitoring is by ground electrode circuit Parameters variation shadow
Sound is larger, causes practical application middle impedance to monitor that tactful reliability is not high.
The content of the invention
The technical problems to be solved by the invention be currently based on impedance monitoring ground electrode circuit fault monitoring method by
Ground electrode circuit parametric variations are larger, cause practical application middle impedance monitor tactful reliability it is not high, and it is an object of the present invention to provide
Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal, is solved the problems, such as above-mentioned.
The present invention is achieved through the following technical solutions：
Extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal, the described method comprises the following steps：
S1：High frequency sinusoidal current signal, note are injected to extra-high voltage DC transmission system ground electrode circuit head end by signal injection device
The amplitude and phase of current signal are recorded, while measurement obtains same frequency voltage magnitude, the phase of signal decanting point, calculates voltage and electricity
The phase difference of stream；S2：The wave impedance of route parameter calculation ground electrode circuit in step S1；S3：According in step S1, S2
The phase difference of voltage magnitude, current amplitude, surge impedance of a line and voltage and current that survey calculation obtains, calculates earthing pole
Line voltage distribution standing-wave ratio；S4：Failure is compared according to ground electrode circuit voltage standing wave(VSW) in step S3 to be identified.
High frequency voltage standing-wave ratio of the present invention based on ground electrode circuit head end carries out the Fault Identification of ground electrode circuit, can
Ground electrode circuit failure is rapidly reliably identified, there is certain anti-transition resistance ability, and be based on high frequency voltage standing-wave ratio
Fault monitoring criterion to line parameter circuit value change it is insensitive, still being capable of reliable recognition ground electrode circuit in circuit Parameters variation
Failure.
Further, in the step S1, the high-frequency current signal frequency of injection is 13.95kHz, the amplitude and phase
Symbol is IsWithSame the frequency voltage magnitude and phase angle symbol that measurement obtains signal decanting point are UsWithVoltage and current
Phase difference is denoted as
Further, in the step S2, ground electrode circuit wave impedance Z is calculatedcSpecific formula for calculation be:In formula, r, l, g, c be respectively the resistance of ground electrode circuit unit length, inductance, conductance and
Capacitance, ω are angular frequency.
Further, in the step S3, according to measurement obtain voltage magnitude, current amplitude, surge impedance of a line and
The phase difference of voltage and current, calculate ground electrode circuit voltage standing wave ratio, the calculation specifically used for：
The characteristics of for ground electrode circuit fault monitoring, circuit head end voltage can be obtainedAnd electric currentTherefore, with head
Hold as the starting point for calculating distance x, the x=0 at head end, can obtain electric for the voltage at x with the distance of head end on transmission line
Flow and be
For lossless circuit, due to propagation constantFor pure imaginary number, therefore makeCause
This, above formula is rewritten as
Using head end electric current vector as reference vector, i.e., its phase angle is 0, therefore is had
Therefore,
Then
Order
Therefore,
Voltage standing wave ratio calculates formula
Further, failure is identified according to the size of ground electrode circuit voltage standing wave ratio, if voltage standing wave ratio is big
In certain threshold value, judge that ground electrode circuit breaks down；If voltage standing wave ratio is less than certain threshold value, judge that ground electrode circuit is normal.
Further, the specific judgment modes of step S4 are：Its
Middle ZcFor ground electrode circuit wave impedance, IsFor circuit head end electric current, UsCircuit head end voltage.
Further, the VSWRsetComputational methods be：VSWRset=kI×VSWRmax_nor, in the formula, VSWRmax_nor
To mismatch the maximum standing-wave ratio that occurs, k due to end resistance during ground electrode circuit normal operationIIt is then safety factor, one
As can be taken as 1.1.
The present invention compared with prior art, has the following advantages and advantages：
1st, the extra-high voltage direct current ground electrode circuit fault monitoring method of the invention based on Injection Signal, has and clearly adjusts
Principle, the data obtained using a whole set of calculation formula, can accurately be reacted standing-wave ratio, accurately carry out fault monitoring；
2nd, the extra-high voltage direct current ground electrode circuit fault monitoring method of the invention based on Injection Signal, Project Realization can be straight
It is connected on the hardware and equipment of the impedance monitoring arrangement of Practical Project, it is not necessary to increase new equipment, it is only necessary to corresponding to replace failure
Monitor algorithm.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the extra-high voltage DC transmission system ground electrode circuit malfunction monitoring apparatus that the present invention uses；
Fig. 2 is standing-wave ratio figure when transition resistance is 100 ohm and 200 ohm when double back is grounded with point；
Fig. 3 is standing-wave ratio figure when transition resistance is 0.1 ohm when double back is grounded with point；
Fig. 4 is standing-wave ratio figure when transition resistance is 100 ohm and 200 ohm after single tieback earth fault；
Fig. 5 is standing-wave ratio figure when transition resistance is 0.1 ohm after single tieback earth fault.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
Extra-high voltage direct current ground electrode circuit fault monitoring method of the invention based on Injection Signal, methods described include following
Step：S1：High frequency sinusoidal electric current is injected by signal injection device to extra-high voltage DC transmission system ground electrode circuit head end to believe
Number, the amplitude and phase of record current signal, while measurement obtains same frequency voltage magnitude, the phase of signal decanting point, calculates electricity
The phase difference of pressure and electric current；S2：The wave impedance of route parameter calculation ground electrode circuit in step S1；S3：According to step
The phase difference of survey calculation obtains in S1, S2 voltage magnitude, current amplitude, surge impedance of a line and voltage and current, calculate
Go out ground electrode circuit voltage standing wave ratio；S4：Failure is compared according to ground electrode circuit voltage standing wave(VSW) in step S3 to be identified.
High frequency voltage standing-wave ratio of the present invention based on ground electrode circuit head end carries out the Fault Identification of ground electrode circuit, can
Ground electrode circuit failure is rapidly reliably identified, there is certain anti-transition resistance ability, and be based on high frequency voltage standing-wave ratio
Fault monitoring criterion to line parameter circuit value change it is insensitive, still being capable of reliable recognition ground electrode circuit in circuit Parameters variation
Failure.
Embodiment two
The present embodiment refines to 1 each step specific implementation method of above-described embodiment, in the step S1, injection
High-frequency current signal frequency be 13.95kHz, the amplitude and phase symbol are IsWithMeasurement obtains the same of signal decanting point
Frequency voltage magnitude and phase angle symbol are UsWithThe phase difference of voltage and current is denoted as
In the step S2, ground electrode circuit wave impedance Z is calculatedcSpecific formula for calculation be:
In formula, r, l, g, c are respectively the resistance, inductance, electricity of ground electrode circuit unit length
Lead and capacitance, ω are angular frequency.
In the step S3, the voltage magnitude, current amplitude, surge impedance of a line and the voltage and current that are obtained according to measurement
Phase difference, calculate ground electrode circuit voltage standing wave ratio, the calculation specifically used for：
The characteristics of for ground electrode circuit fault monitoring, circuit head end voltage can be obtainedAnd electric currentTherefore, with head
Hold as the starting point for calculating distance x, the x=0 at head end, can obtain electric for the voltage at x with the distance of head end on transmission line
Flow and be
For lossless circuit, due to propagation constantFor pure imaginary number, therefore makeCause
This, above formula is rewritten as
Using head end electric current vector as reference vector, i.e., its phase angle is 0, therefore is had
Therefore,
Then
Order
Therefore,
Voltage standing wave ratio calculates formula
Failure is identified according to the size of ground electrode circuit voltage standing wave ratio, if voltage standing wave ratio is more than certain threshold value,
Judge that ground electrode circuit breaks down；If voltage standing wave ratio is less than certain threshold value, judge that ground electrode circuit is normal.
The specific judgment modes of step S4 are：Wherein ZcTo connect
Earth polar surge impedance of a line, IsFor circuit head end electric current, UsCircuit head end voltage.
The VSWRsetComputational methods be：VSWRset=kI×VSWRmax_nor, in the formula, VSWRmax_norFor earthing pole
Due to the maximum standing-wave ratio that end resistance mismatches and occurs, k during circuit normal operationIIt is then safety factor, typically can be taken as
1.1。
Embodiment three
As shown in Fig. 1~5, with reference to above-described embodiment, the present embodiment discloses a concrete application example of the above method.Tool
Body by taking a DC transmission system model as an example, there is provided a simulation example.
The inventive method has built ± 800kV extra-high voltage DC transmission system simulation models, model parameter with reference to southwest-
East China Practical Project parameter.Wherein, the specified transmission capacity 8000MW of DC transmission system；Transmission line length 1652km, should
The method of operation that the ground electrode circuit of engineering is interconnected using double back erection in parallel and two ends, its structure are as shown in Figure 1.Emulation system
Ground electrode circuit uses Bergeron models, line length 100km in system.
In ground electrode circuit normal operation, circuit head end voltage that electromagnetic transient simulation obtains, results of weak current are brought into
Voltage standing wave ratio calculates to be easy to get in formula
VSWR=1.18 ＜ VSWRset
As can be seen here, it is contemplated that ground electrode circuit self-resistance and line end resistance can not completely and surge impedance of a line
The factors such as matching, the voltage standing wave ratio VSWR that monitoring arrangement measures under normal circumstances can be slightly larger than 1.The conclusion and theory before
Analysis is consistent.But under normal circumstances, the voltage standing wave ratio being calculated still is less than the setting valve of Fault Identification criterion, prison
View apparatus will not malfunction.
As shown in Figure 1, extra-high voltage direct-current transmission engineering ground electrode circuit is often using double circuits on same tower erection mode and in head
Tail end interconnects, therefore double back two kinds of fault types be present with point ground connection and single tieback.
Fig. 2 and Fig. 3 sets forth when double back occurs for ground electrode circuit diverse location with putting ground connection and single tieback former
After barrier, based on the obtained voltage standing wave ratio of emulation.
In Fig. 3 and Fig. 5, the minimum value of voltage standing wave ratio is respectively 42.58 and 1.44, still above setting valve.By Fig. 2 and
Fig. 3 understands, using set forth herein fault monitoring strategy, can be reliable when metallic earthing failure occurs in ground electrode circuit
Failure is identified, the effective range of impedance monitoring strategy reaches total track length.
Simultaneously from upper figure, short dot transition resistance has subtracted when can cause the measurement of voltage standing wave ratio compared with short circuit metal
It is small, but under operating mode of the short dot transition resistance less than 200 Ω, still significantly greater than strategy is whole for the voltage standing wave ratio being calculated
Definite value.Therefore, under operating mode of the short dot transition resistance less than 200 Ω, impedance monitoring arrangement can still connect in ground electrode circuit
Under earth fault, failure is reliably identified.
Understand that fault monitoring method proposed by the present invention can reliably identify ground electrode circuit failure by examples detailed above, and
Ability with certain anti-transition resistance.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (7)
1. the extra-high voltage direct current ground electrode circuit fault monitoring method based on Injection Signal, it is characterised in that methods described includes
Following steps：
S1：High frequency sinusoidal electric current is injected by signal injection device to extra-high voltage DC transmission system ground electrode circuit head end to believe
Number, the amplitude and phase of record current signal, while measurement obtains same frequency voltage magnitude, the phase of signal decanting point, calculates electricity
The phase difference of pressure and electric current；
S2：The wave impedance of route parameter calculation ground electrode circuit in step S1；
S3：Voltage magnitude, current amplitude, surge impedance of a line and the voltage and electricity obtained according to survey calculation in step S1, S2
The phase difference of stream, calculate ground electrode circuit voltage standing wave ratio；
S4：Failure is compared according to ground electrode circuit voltage standing wave(VSW) in step S3 to be identified.
2. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 1 based on Injection Signal, it is special
Sign is, in the step S1, the high-frequency current signal frequency of injection is 13.95kHz, and the amplitude and phase symbol are IsWithSame the frequency voltage magnitude and phase angle symbol that measurement obtains signal decanting point are UsWithThe phase difference of voltage and current is denoted as
3. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 1 based on Injection Signal, it is special
Sign is, in the step S2, calculates ground electrode circuit wave impedance ZcSpecific formula for calculation be:
<mrow>
<msub>
<mi>Z</mi>
<mi>c</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mo>(</mo>
<mi>r</mi>
<mo>+</mo>
<mi>j</mi>
<mi>&omega;</mi>
<mi>l</mi>
<mo>)</mo>
<mo>/</mo>
<mo>(</mo>
<mi>g</mi>
<mo>+</mo>
<mi>j</mi>
<mi>&omega;</mi>
<mi>c</mi>
<mo>)</mo>
</mrow>
</msqrt>
</mrow>
In formula, r, l, g, c are respectively resistance, inductance, conductance and the capacitance of ground electrode circuit unit length, and ω is angular frequency.
4. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 1 based on Injection Signal, it is special
Sign is, in the step S3, the voltage magnitude, current amplitude, surge impedance of a line and the voltage and current that are obtained according to measurement
Phase difference, calculate ground electrode circuit voltage standing wave ratio.
5. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 1 based on Injection Signal, it is special
Sign is, in the step S4, failure is identified according to the size of ground electrode circuit voltage standing wave ratio, if voltage standing wave ratio
More than certain threshold value, judge that ground electrode circuit breaks down；If voltage standing wave ratio is less than certain threshold value, judge that ground electrode circuit is normal.
6. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 5 based on Injection Signal, it is special
Sign is that the specific judgment modes of step S4 are：Wherein ZcFor ground connection
Pole surge impedance of a line, IsFor circuit head end electric current, UsCircuit head end voltage.
7. the extra-high voltage direct current ground electrode circuit fault monitoring method according to claim 6 based on Injection Signal, it is special
Sign is, the VSWRsetComputational methods be：VSWRset=kI×VSWRmax_nor,
In formula, VSWRmax_norTo mismatch the maximum standing-wave ratio that occurs due to end resistance during ground electrode circuit normal operation,
kIIt is then safety factor, typically can be taken as 1.1.
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| CN108845219A (en) * | 2018-06-26 | 2018-11-20 | 西南交通大学 | A kind of recognition methods of System for HVDC System Earth Pole line fault |
| 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 |
| CN109142983A (en) * | 2018-09-30 | 2019-01-04 | 国网四川省电力公司电力科学研究院 | High frequency injection signals frequency selecting method and device based on line parameter circuit value error |
| CN109217269A (en) * | 2018-10-31 | 2019-01-15 | 国网四川省电力公司电力科学研究院 | Extra-high voltage direct-current system earth pole line protection method and device |
| CN109444670A (en) * | 2018-12-21 | 2019-03-08 | 青岛科汇电气有限公司 | Fault location system and method for grounding electrode line in direct current transmission system |
| CN110579685A (en) * | 2019-09-12 | 2019-12-17 | 国网四川省电力公司电力科学研究院 | Method and device for protecting grounding electrode line of extra-high voltage direct current system |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN114113794A (en) * | 2021-11-22 | 2022-03-01 | 哈尔滨工业大学（深圳） | Sinusoidal excitation-based conductive cable impedance single-end detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN109142983A (en) * | 2018-09-30 | 2019-01-04 | 国网四川省电力公司电力科学研究院 | High frequency injection signals frequency selecting method and device based on line parameter circuit value error |
| CN109142983B (en) * | 2018-09-30 | 2020-06-09 | 国网四川省电力公司电力科学研究院 | High-frequency injection signal frequency selection method and device based on line parameter errors |
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| CN109444670A (en) * | 2018-12-21 | 2019-03-08 | 青岛科汇电气有限公司 | Fault location system and method for grounding electrode line in direct current transmission system |
| CN110579685A (en) * | 2019-09-12 | 2019-12-17 | 国网四川省电力公司电力科学研究院 | Method and device for protecting grounding electrode line of extra-high voltage direct current system |
| CN110579685B (en) * | 2019-09-12 | 2021-08-31 | 国网四川省电力公司电力科学研究院 | Method and device for protecting grounding electrode line of extra-high voltage direct current system |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN114113794A (en) * | 2021-11-22 | 2022-03-01 | 哈尔滨工业大学（深圳） | Sinusoidal excitation-based conductive cable impedance single-end detection method |
| CN114113794B (en) * | 2021-11-22 | 2024-03-26 | 哈尔滨工业大学（深圳） | Sinusoidal excitation-based conductive cable impedance single-end detection method |
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