CN105891678A - Ultrahigh voltage direct current line fault discrimination method based on frequency band measurement impedance - Google Patents
Ultrahigh voltage direct current line fault discrimination method based on frequency band measurement impedance Download PDFInfo
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- CN105891678A CN105891678A CN201610227884.3A CN201610227884A CN105891678A CN 105891678 A CN105891678 A CN 105891678A CN 201610227884 A CN201610227884 A CN 201610227884A CN 105891678 A CN105891678 A CN 105891678A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- 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
- H02H3/40—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 responsive to ratio of voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- H02H3/44—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 responsive to the rate of change of electrical quantities
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
- H02H5/105—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection responsive to deterioration or interruption of earth connection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses an ultrahigh voltage direct current line fault discrimination method based on frequency band measurement impedance. Voltage and current of two sides of a direct line can be sampled, and voltage and current in specific frequency band can be acquired, and then frequency band measurement impedance of two sides and break variable thereof can be calculated, and then the line fault can be discriminated by comparing the break variable with the set fault discrimination threshold value. The ultrahigh voltage direct current line fault discrimination method is advantageous in that by adopting the ratio between the frequency band voltage and the frequency band current, and the frequency band measurement impedance can be used as the fault criterion, and then the frequency band measurement impedance during the internal fault can be determined by the system parameter and the topology, and cannot be affected by the transient voltage and the current amplitude theoretically, and therefore the problem of the conventional transient harmonic protection being easily affected by the transition resistor and the line attenuation, and being not sensitive to the changes of the parameters such as the line impedance parameter, the line length, and the smoothing reactor, and other parameters can be overcome.
Description
Technical field
The present invention relates to the technology in a kind of power system failure diagnostic field, a kind of spy measuring impedance based on frequency band
Hvdc transmission line fault distinguishing method.
Background technology
Extra high voltage direct current transmission line is frequently as the interconnection of big area networking, and DC line is the longest, trans-regional extensively, dislike
Running under bad environment, the probability broken down is higher, and the reliability of its fault distinguishing is low.
At present, HVDC transmission line main protection configuration has traveling-wave protection and differential under-voltage protection, and wherein differential under-voltage protection is held concurrently
Do the back-up protection of traveling-wave protection.Back-up protection configuration current differential protection, part engineering is equipped with under-voltage protection the most simultaneously.But
There is the problems such as anti-transition resistance ability is low, sensitivity is low in traveling-wave protection and differential under-voltage protection.Traditional current differential protection does not has
Considering the impact of capacitance current, the most simply employing two ends electric current sum is as failure criterion, for avoiding because external area error causes
Current fluctuation and malfunction, current differential protection action delay is longer, it is difficult to play the effect of DC line back-up protection.
Fault distinguishing method based on transient is that the AC compounent that a class utilizes fault transient to produce therebetween carries out Fault Identification
Method, but, long DC line is fairly obvious for the attenuation of transient, and transient state component is easily affected by transition resistance.
Through finding the retrieval of prior art, Chinese patent literature CN102522733A, publication date is 2012 06
The moon 27, disclose a kind of single-end electrical quantity complete fibre guard method identifying HVDC transmission line district internal and external fault,
It utilizes the amplitude of specific frequency components in single-end DC filter branches to realize the differentiation of troubles inside the sample space, external area error, is mainly used in
The one-terminal data complete fibre protection of DC power transmission line in power system.But the amplitude of the specific frequency components of this technology is easily by fault mistake
Cross resistance and the impact of DC line attenuation, when being applied to extra-high straight-flow system, for high resistive fault and line end fault
Differentiate, selectivity will be lost.
Summary of the invention
The present invention is directed to deficiencies of the prior art, propose a kind of UHVDC Transmission Lines event measuring impedance based on frequency band
Barrier method of discrimination.
The present invention is achieved by the following technical solutions:
First the voltage and current of DC line both sides is sampled by the present invention, obtains the voltage under special frequency band and electric current, and
Rear calculating both sides frequency band measures impedance and Sudden Changing Rate thereof, is compared with the fault distinguishing threshold value of setting by Sudden Changing Rate and differentiates line fault.
The ratio of the voltage under the special frequency band that impedance is either side and electric current measured by described frequency band.
Impedance measured by described frequency bandWherein: ZTMAnd ZTNPoint
Not measuring impedance for DC line both sides frequency band, M, N are denoted as rectification side and the inverter side of DC line both sides respectively,
UM(k)、IM(k)、UN(k)、INK () is respectively the voltage under special frequency band, electric current, NT is time window sampling number
NT=Fs*T, T are time windows, and Fs is sample frequency.
Described special frequency band scope is 400～2000Hz.
The Sudden Changing Rate Δ Z of described rectification sideTM=ZTM-ZTM0, the countercurrently Sudden Changing Rate Δ Z of sideTN=ZTN-ZTN0, wherein: ZTM0For
Frequency band during rectification side properly functioning measures impedance, ZTN0Impedance is measured for frequency band during adverse current side properly functioning.
Described Sudden Changing Rate Δ ZTM＜ ZMsetAnd Δ ZTN＜ ZNsetTime, it is determined that break down in DC line, ZMsetAnd ZNsetPoint
Wei rectification side and the fault distinguishing threshold value of inverter side.
Described fault distinguishing threshold value ZMset=-0.1ZTM0, ZNset=-0.1ZTN0。
Technique effect
Compared with prior art, the present invention is not easily susceptible to the interference of signal noise and power swing, calculates simple, reduces hardware
Cost, it is easy to Project Realization, it is possible to effectively overcome the impact of transition resistance and Line Attenuation, not by transient voltage and current amplitude
Impact.
Accompanying drawing explanation
Fig. 1 is extra-high voltage DC transmission system structural representation；
Fig. 2 is DC filter structural representation:
In figure: (a) is 12/24 double-tuned filter；B () is 12/24/26 three-tuned filter；
Fig. 3 is the method flow schematic diagram of embodiment 1；
Fig. 4 is the analogous diagram measuring impedance differentiation DC line fault according to frequency band:
In figure: (a) is positive pole circuit two-sided measurement voltage pattern；B () is positive pole circuit two-sided measurement map of current；C () is positive pole circuit
Both sides frequency band component of voltage figure；D () is positive pole circuit both sides band current component map；E () surveys for the positive pole circuit both sides frequency band calculated
Amount change in the instantaneous impedance spirogram；
Fig. 5 is the analogous diagram measuring impedance differentiation external area error according to frequency band:
In figure: (a) is positive pole circuit two-sided measurement voltage pattern；B () is positive pole circuit two-sided measurement map of current；C () is positive pole circuit
Both sides frequency band component of voltage figure；D () is positive pole circuit both sides band current component map；E () surveys for the positive pole circuit both sides frequency band calculated
Amount change in the instantaneous impedance spirogram；
Fig. 6 is the analogous diagram measuring impedance differentiation DC line high resistance earthing fault according to frequency band:
In figure: (a) is positive pole circuit two-sided measurement voltage pattern；B () is positive pole circuit two-sided measurement map of current；C () is for just calculating
Change in the instantaneous impedance spirogram measured by both sides, polar curve road frequency band；
Fig. 7 is to measure impedance according to frequency band to differentiate the electrode line curb line analogous diagram through different transition resistance earth faults:
In figure: (a) is the sudden change spirogram that impedance measured by positive pole circuit rectification side frequency band；B () is that positive pole circuit inverter side frequency band is measured
Impedance diagram.
Detailed description of the invention
Elaborating embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention,
Give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As it is shown in figure 1, M, N are respectively the measurement point of DC line both end voltage and electric current, A, B, C, D represent respectively
DC line external area error point position, wherein A, B are positioned at the connecting line of inverter and smoothing reactor, and C, D are positioned at rectification side
With inverter side exchange at change of current bus, F represents DC line fault point position.Fig. 1 illustrates for DC filter in dotted line frame
Figure, as in figure 2 it is shown, for extra-high voltage DC transmission system, general configuration 12/24 double-tuned filter and 12/24/36
Three-tuned filter.
During described DC transmission system fault, during fault transient, trouble point can be considered transient state harmonic source.Transient state harmonic source
Being positioned at DC line fault point, transient state harmonic current is flowed to circuit both sides by trouble point, DC filter for its tuning point near
Band current present relatively low impedance operator, then the ratio of the component of voltage of this frequency band and current component, i.e. frequency band measures impedance, number
It is worth relatively low；And when external area error, the transient state harmonic wave of circuit side is flowed to line port by circuit, and opposite side transient state harmonic current
Then flowed to DC line by line port.Owing to DC line presents higher impedance, therefore, DC line to transient AC component
It is relatively low that impedance value measured by the frequency band that side calculates, and it is relatively low that impedance value measured by the frequency band that opposite side calculates.As can be seen here, direct current
Circuit internal fault external fault, the frequency band that both sides calculate is measured the Sudden Changing Rate obvious difference of impedance, can be formed failure criterion accordingly.
As it is shown on figure 3, concrete fault distinguishing method comprises the following steps:
1) voltage, the electric current of DC line both sides is sampled, the voltage after sampling, electric current is carried out digital band pass filtering,
Obtaining the voltage under special frequency band and electric current, this special frequency band is 400～2000Hz.
2) utilize the voltage under special frequency band, electric current, calculate the ratio of rectification side and inverter side voltage with electric current, i.e. frequency band and measure resistance
Anti-.
Impedance measured by described frequency bandWherein: ZTMAnd ZTNPoint
Not measuring impedance for DC line both sides frequency band, M, N are denoted as rectification side and the inverter side of DC line both sides respectively,
UM(k)、IM(k)、UN(k)、INK () is respectively the voltage under special frequency band, electric current, NT is time window sampling number
NT=Fs*T, T are time windows, and Fs is sample frequency.
3) special frequency band calculating DC line both sides measures the Sudden Changing Rate of impedance.
The Sudden Changing Rate Δ Z of described rectification sideTM=ZTM-ZTM0, the countercurrently Sudden Changing Rate Δ Z of sideTN=ZTN-ZTN0, wherein: ZTM0For
Frequency band during rectification side properly functioning measures impedance, ZTN0Impedance is measured for frequency band during adverse current side properly functioning.
4) Sudden Changing Rate of the frequency band measurement impedance calculated DC line both sides carries out logical judgment.
Described Δ ZTM＜ ZMsetAnd Δ ZTN＜ ZNsetTime, then it is judged to DC line troubles inside the sample space；ΔZTM≥ZMsetOr
ΔZTN≥ZNset, then DC line external area error or normal operating condition, in formula, Z it are judged toMsetAnd ZNsetFault for setting is sentenced
Other threshold value.
Described fault distinguishing threshold value ZMset=-0.1ZTM0, ZNset=-0.1ZTN0。
In the present embodiment, the differentiation to the system diverse location fault shown in Fig. 1 carries out simulating, verifying.Owing to extra-high voltage direct-current is defeated
Electricity system both positive and negative polarity circuit has symmetry, for the differentiation of DC line fault, only gives the simulation results of positive pole circuit.
Simultaneously as the structure of converting plant and Inverter Station has symmetry, therefore only give the imitative of converting plant AC external area error differentiation
True the result, the most as shown in Figures 4 to 7, wherein: Fig. 4 is to metallicity fault at DC line positive pole circuit 2000km
Differentiation verified；Outside Tu5Dui district, the differentiation of rectifier terminal AC three phase short circuit fault is verified；Fig. 6 and Fig. 7 pair
At DC line high resistive fault i.e. positive pole circuit 1000km, the differentiation through 1000 Ω transition resistance earth faults is verified.Each figure
The fault distinguishing threshold value of middle fault distinguishing calculates all in accordance with system band component time properly functioning and obtains.According to time properly functioning
Frequency band is measured impedance computation and is obtained ZTM0=198.3 Ω, ZTN0=194.5 Ω, therefore fault distinguishing threshold value is respectively set as
ZMset=ZNset=-20 Ω.
According to the result of Fig. 4 to Fig. 7, may indicate that the fault distinguishing method that the present invention provides can reliably differentiate AC line
Road district internal and external fault, is not affected by DC line length.For the DC line of 2000km, its anti-transition resistance ability is high
Reach 1000 Ω.
Use frequency band electric parameters to calculate failure criterion, the easy trusted of electric parameters using single characteristic frequency point can be overcome in traditional method
The defect of number interference effect such as noise, power swing.The form calculus frequency band using 400～2000Hz band component virtual values is measured
Impedance, it is not necessary to accurately calculate the amplitude of band component and each frequency component phase place, less demanding to sample frequency, 4kHz in theory
Sample frequency can meet calculating requirement.Therefore, this method calculates simple, reduces hardware cost, it is easy to Project Realization.Adopt
Measuring impedance with frequency band and carry out fault distinguishing, it is relevant that frequency band measurement impedance only has system inherent structure, and therefore, this method is not by transient state
The impact of voltage and current amplitude, can effectively overcome the impact of transition resistance and Line Attenuation.For warp in the middle of 2000km circuit
1000 Ω transition resistance earth faults, this method remains to reliably differentiate.
Compared with prior art, this method measures impedance as failure criterion, district by the ratio of frequency band voltage with electric current, i.e. frequency band
Frequency band during internal fault is measured impedance and is determined by systematic parameter and topology, is not affected by transient voltage, current amplitude, can
To overcome tradition transient state harmonic protection easily to be affected by transition resistance and Line Attenuation.To line impedance parameter, line length, flat ripple electricity
The isoparametric change of anti-device is insensitive.
Claims (6)
1. the UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band, it is characterised in that first to AC line
The voltage and current of both sides, road is sampled, and obtains the voltage under special frequency band and electric current, then calculate both sides frequency band measure impedance and
Its Sudden Changing Rate, compares Sudden Changing Rate with the fault distinguishing threshold value of setting and differentiates line fault；
The ratio of the voltage under the special frequency band that impedance is either side and electric current measured by described frequency band.
The UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band the most according to claim 1, is characterized in that,
Impedance measured by described frequency bandWherein: ZTMAnd ZTNIt is respectively straight
Impedance measured by Flow Line both sides frequency band, and M, N are denoted as rectification side and the inverter side of DC line both sides, U respectivelyM(k)、
IM(k)、UN(k)、INK () is respectively the voltage under special frequency band, electric current, NT is time window sampling number NT=Fs*T,
T is time window, and Fs is sample frequency.
The UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band the most according to claim 2, is characterized in that,
Described special frequency band scope is 400～2000Hz.
The UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band the most according to claim 2, is characterized in that,
The Sudden Changing Rate Δ Z of described rectification sideTM=ZTM-ZTM 0, the countercurrently Sudden Changing Rate Δ Z of sideTN=ZTN-ZTN 0, wherein: ZTM 0For rectification
Frequency band during side properly functioning measures impedance, ZTN 0Impedance is measured for frequency band during adverse current side properly functioning.
The UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band the most according to claim 4, is characterized in that,
Described Sudden Changing Rate Δ ZTM＜ ZMsetAnd Δ ZTN＜ ZNsetTime, it is determined that break down in DC line, ZMsetAnd ZNsetThe most whole
Stream side and the fault distinguishing threshold value of inverter side.
The UHVDC Transmission Lines fault distinguishing method measuring impedance based on frequency band the most according to claim 5, is characterized in that,
Described fault distinguishing threshold value ZMset=-0.1ZTM 0, ZNset=-0.1ZTN 0。
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Cited By (5)
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| CN109946562A (en) * | 2017-12-20 | 2019-06-28 | 中国电力科学研究院有限公司 | A kind of electrical power distribution network fault location method and system |
| CN110927646A (en) * | 2019-11-05 | 2020-03-27 | 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 | Method for positioning abnormal fault of direct-current voltage measurement of high-voltage direct-current power transmission system |
| CN112269063A (en) * | 2020-10-13 | 2021-01-26 | 国网江苏省电力有限公司电力科学研究院 | Transition resistance measurement method and system based on differential current of direct-current power distribution network |
| CN112986744A (en) * | 2021-04-26 | 2021-06-18 | 湖南大学 | Frequency fault tolerance detection method and system under transient fault condition of power system |
| EP4148929A1 (en) * | 2021-09-14 | 2023-03-15 | General Electric Technology GmbH | Systems and methods for high-speed falling conductor protection in electric transmission systems |
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| EP4148929A1 (en) * | 2021-09-14 | 2023-03-15 | General Electric Technology GmbH | Systems and methods for high-speed falling conductor protection in electric transmission systems |
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| CN105891678B (en) | 2018-07-27 |
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