CN105207186B - A kind of distance protecting method for the transmission line of electricity containing THE UPFC - Google Patents
A kind of distance protecting method for the transmission line of electricity containing THE UPFC Download PDFInfo
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Abstract
The invention discloses a kind of distance protecting method for the transmission line of electricity containing THE UPFC, need not be using complicated neural network algorithm or the synchro measure phasor information of circuit both sides, merely with this side voltage, electric current, coordinate R L Differential Equation Algorithms that trouble point can be calculated to the distance of protective relaying device installation place, and according in fault distance result of calculation and its degree of fluctuation cog region and external area error, do not influenceed by UPFC operational modes and control parameter, to ensure the correctness of protection act behavior, it is convenient and reliable, easily realize, have a good application prospect.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, and in particular to a kind of to be used for containing THE UPFC
The distance protecting method of transmission line of electricity.
Background technology
THE UPFC (unified power flow controller, UPFC) is by series connection transverter and parallel connection
Transverter collectively constitutes, and series connection transverter injects an amplitude and the adjustable series electrical of phase by series transformer to power network
Pressure, with the active and reactive power flow of control circuit；Parallel inverter then by shunt transformer absorb or provide active power with
Maintain DC voltage constant, while absorb or provide reactive power to adjust the voltage of the ac bus of UPFC accesses.Therefore,
UPFC can change ac bus voltage, line parameter circuit value and trend, so as to increase substantially Transmission Lines capacity, reduce line
Damage and raising system maintenance level.
Although control ability powerful UPFC brings great benefit to the operation of power system, it is accessed also to electricity
Protective relaying device in net proposes the problem of many new, and the performance of especially traditional distance protection is due to UPFC access
And greatly deteriorate.The general principle of traditional distance protection is to be calculated using the fundamental component measured in voltage, electric current from protection
Installation place to trouble point apparent impedance, and compared with setting valve, so as to judge whether that there occurs protection troubles inside the sample space.So
And UPFC power network is accessed, UPFC operation characteristic will change measurement voltage, the steady-state component in electric current and temporarily during failure
State component, so as to be impacted to the measurement impedance of traditional distance protection and performance.
At present, the power transmission line distance protection improvement project containing UPFC can be largely classified into two major classes：The first kind is based on god
Adaptive distance protection scheme through network algorithm, another kind of is the synchro measure phase based on transmission line of electricity both sides voltage, electric current
The distance protection improvement project of amount.In general, UPFC has three kinds of STATCOM patterns, SSSCs
Three kinds of different operational modes such as pattern and complete UPFC patterns.And UPFC control parameter will be according to difference under different operational modes
Operation of power networks requirement adjusted.In addition, during according to electric network fault type, the order of severity and duration difference, after failure
Also there will be larger difference for UPFC output voltage, electric current.Therefore, UPFC operation conditions is extremely in the case of stable state and transient state
Complexity, the adaptive distance protection scheme needs based on neural network algorithm are caused largely test and learn.The opposing party
Face, requirement of the distance protection improvement project to communication system based on transmission line of electricity both sides voltage, the synchro measure phasor of electric current
It is higher, and protection device is complex, therefore its engineer applied faces certain difficulty.
Therefore, how to study and propose a kind of distance protection scheme suitable for the transmission line of electricity containing UPFC, to ensure to protect
The correctness of action behavior is protected, is that current urgent need solves for ensureing that power system security stable operation is significant
Problem.
The content of the invention
Technical problem solved by the invention is to overcome existing access UPFC power network, and UPFC operation is special during failure
Property will change measurement voltage, steady-state component and transient state component in electric current, so as to the measurement impedance to traditional distance protection and
The problem of performance impacts.The distance protecting method for the transmission line of electricity containing THE UPFC of the present invention, utilize
This side voltage, the distance of Current calculation trouble point to protective relaying device installation place, and according to the ripple of fault distance result of calculation
It is convenient and reliable to ensure the correctness of protection act behavior in traverse degree cog region and external area error, easily realize have good
Good application prospect.
In order to solve to reach above-mentioned purpose, the technical solution adopted in the present invention is：
A kind of distance protecting method for the transmission line of electricity containing THE UPFC, it is characterised in that：Including following
Step,
Step (1), fault distance l is setiterInitial value, make liter=0.5lwhole, wherein literFor fault distance, it is
Distance from protective relaying device installation place to trouble point, lwholeFor the total length of transmission line of electricity, if transmission line of electricity breaks down, note
It is t to record the failure generation moment0；
Step (2), protective relaying device is obtained in the sampled value of current sampling point, sampling instant corresponding to current sampling point
For tcal；
Step (3), is pre-processed to the sampled value of acquisition, obtains handling it by second order Butterworth LPF
Measurement voltage, electric current and the fault point voltage of reconstruct afterwards；
Step (4), if tcal-t0>=5ms, then into step (5)；Otherwise, return to step (2)；
Step (5), by tcal- 5ms the moment is to tcalSampled data between moment, substitute into the R-L differential sides of transmission line of electricity
Journey model, formula (1) is obtained,
Wherein, uaAnd i (t)a(t) it is respectively phase voltage and electric current that protective relaying device measurement obtains, ufr(t) it is reconstruct
Fault point voltage, ia(0)(t) zero-sequence current obtained for protective relaying device measurement；Rline(1)And Lline(1)Respectively transmit electricity
Circuit unit length positive sequence resistance and reactance, Rline(0)And Lline(0)Respectively transmission line of electricity unit length zero sequence resistance and reactance；
L is result of calculation of the trouble point to protective relaying device installation place；
Step (6), the differential equation group of formula (1) is solved using least-squares algorithm, obtain trouble point to after
The result of calculation l of electrical protective device installation place distance, and make liter=l；
Step (7), if tcal-t0<30ms, then next sampled point, and repeat step (2)~step (6) are moved to, counted
The trouble point of next sampled point is calculated to the distance of protection protective relaying device installation place；Otherwise, into step (8)；
Step (8), according to step (7), obtain that moment t occurs in failure05ms is calculated to 30ms periods each sampled point afterwards
Obtained fault distance, because moment t occurs for failure05ms is unstable to the fault distance result of calculation of 10ms periods afterwards, therefore
Moment t occurs using failure010ms describes its degree of fluctuation to the fault distance result of calculation of 30ms periods afterwards, according to public affairs
Formula (2), obtains coefficient of variation σ,
Wherein, lmaxAnd lminThe respectively maximum and minimum value of fault distance result of calculation；
Step (9), according to the criterion shown in formula (3),
It is troubles inside the sample space or external area error that identification, which obtains failure, it is ensured that the protection act behavior of protective relaying device is just
True property.
It is previously described for the distance protecting method of the transmission line of electricity containing THE UPFC, it is characterised in that：Step (3)
The second order Butterworth LPF is used to filter out the high fdrequency component in measurement voltage, electric current, ensures formula in step (5)
(1) each electrical quantity of measurement meets the initial parameter model of transmission line of electricity in.
It is previously described for the distance protecting method of the transmission line of electricity containing THE UPFC, it is characterised in that：Described two
The amplitude-frequency response characteristic of rank Butterworth LPF, as shown in formula (4),
Wherein, ωcFor cut-off angular frequency.
The beneficial effects of the invention are as follows：The distance protection side for the transmission line of electricity containing THE UPFC of the present invention
Method, without the synchro measure phasor information using complicated neural network algorithm or circuit both sides, merely with this side voltage, electric current
Trouble point is calculated to the distance of protective relaying device installation place, and in the degree of fluctuation cog region according to fault distance result of calculation
And external area error, it is convenient and reliable to ensure the correctness of protection act behavior, easily realize, have a good application prospect.
Brief description of the drawings
Fig. 1 is the flow chart of the distance protecting method for the transmission line of electricity containing THE UPFC of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in figure 1, the distance protecting method for the transmission line of electricity containing THE UPFC of the present invention, including with
Lower step,
Step (1), fault distance l is setiterInitial value, make liter=0.5lwhole, wherein literFor fault distance, i.e.,
For the distance from protective relaying device installation place to trouble point, lwholeFor the total length of transmission line of electricity, if transmission line of electricity breaks down,
It is t to record the failure generation moment0；
Step (2), protective relaying device is obtained in the sampled value of current sampling point, sampling instant corresponding to current sampling point
For tcal；
Step (3), is pre-processed to the sampled value of acquisition, obtains handling it by second order Butterworth LPF
Measurement voltage, electric current afterwards, and fault point voltage is reconstructed, second order Butterworth LPF is used to filter out measurement voltage, electricity
High fdrequency component in stream, ensure subsequently to calculate the initial parameter model that each electrical quantity used meets transmission line of electricity, second order Bart
The amplitude-frequency response characteristic of Butterworth low pass filter, as shown in formula (4),
Wherein, ωcFor cut-off angular frequency, in of the invention, ω is takenc=942.48rad/s；
Distance protection installed in transmission line of electricity first and end can not know the voltage of trouble point, can only utilize and pass through second order
Fault point voltage is reconstructed for measurement voltage, electric current after Butterworth LPF processing, as shown in formula (5),
Wherein, ufrFor the fault point voltage of reconstruct, RfrFor the transition resistance of reconstruct, ufr1It is the fault point voltage of reconstruct
Component before failure, ia(0)The zero-sequence current obtained for protective relaying device measurement, iaThe failure obtained for protective relaying device measurement
Phase current, according to formula (6), component u before the failure of the fault point voltage reconstructedfr1,
ufr1=ua-(Lline(1)dia/dt+Rline(1)ia)liter (6)
Wherein, uaThe faulted phase voltage obtained for protective relaying device measurement, Rline(1)And Lline(1)Respectively transmission line of electricity
Unit length positive sequence resistance and reactance.Meanwhile before breaking down, Section 2 is zero on the right of equal sign in formula (5), i.e. Rfria(0)
=0, Rfria=0；After breaking down, Section 1 is zero on the right of equal sign in formula (5), i.e. ufr1=0, ia(0)Or iaThen protected for relay
The actual measurement electric current of protection unit；
Step (4), if tcal-t0>=5ms, then into step (5)；Otherwise, return to step (2)；
Step (5), by tcal- 5ms the moment is to tcalSampled data between moment, substitute into the R-L differential sides of transmission line of electricity
Journey model, formula (1) is obtained,
Wherein, uaAnd i (t)a(t) it is respectively phase voltage and electric current that protective relaying device measurement obtains, ufr(t) it is reconstruct
Fault point voltage, ia(0)(t) zero-sequence current obtained for protective relaying device measurement；Rline(1)And Lline(1)Respectively transmit electricity
Circuit unit length positive sequence resistance and reactance, Rline(0)And Lline(0)Respectively transmission line of electricity unit length zero sequence resistance and reactance；
L is result of calculation of the trouble point to protective relaying device installation place；
Step (6), the differential equation group of formula (1) is solved using least-squares algorithm, obtain trouble point to after
The result of calculation l of electrical protective device installation place distance, and make liter=l；
Step (7), if tcal-t0<30ms, then next sampled point, and repeat step (2)~step (6) are moved to, counted
The trouble point of next sampled point is calculated to the distance of protective relaying device installation place；Otherwise, into step (8)；
Step (8), according to step (7), obtain that moment t occurs in failure05ms is calculated to 30ms periods each sampled point afterwards
Obtained fault distance.Because moment t occurs for failure05ms is unstable to the fault distance result of calculation of 10ms periods afterwards, therefore
Moment t occurs using failure010ms describes its degree of fluctuation to the fault distance result of calculation of 30ms periods afterwards, according to public affairs
Formula (2), obtains coefficient of variation σ,
Wherein, lmaxAnd lminThe respectively maximum and minimum value of fault distance result of calculation；
Step (9), according to the criterion shown in formula (6),
It is troubles inside the sample space or external area error that identification, which obtains failure, it is ensured that the protection act behavior of protective relaying device is just
True property.
General principle, the main features and advantages of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, the original for simply illustrating the present invention described in above-described embodiment and specification
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (3)
- A kind of 1. distance protecting method for the transmission line of electricity containing THE UPFC, it is characterised in that：Including following step Suddenly,Step (1), fault distance l is setiterInitial value, make liter=0.5lwhole, wherein literFor fault distance, be from after Electrical protective device installation place is to the distance of trouble point, lwholeFor the total length of transmission line of electricity, if transmission line of electricity breaks down, record event The barrier generation moment is t0；Step (2), obtains sampled value of the protective relaying device in current sampling point, and sampling instant corresponding to current sampling point is tcal；Step (3), is pre-processed to the sampled value of acquisition, is obtained after being handled by second order Butterworth LPF Measure voltage, electric current and the fault point voltage of reconstruct；Step (4), if tcal-t0>=5ms, then into step (5)；Otherwise, return to step (2)；Step (5), by tcal- 5ms the moment is to tcalSampled data between moment, substitute into the R-L differential equation moulds of transmission line of electricity Type, formula (1) is obtained,<mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>u</mi> <mi>a</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>{</mo> <msub> <mi>L</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mfrac> <mrow> <mi>d</mi> <mrow> <mo>&lsqb;</mo> <mrow> <msub> <mi>i</mi> <mi>a</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>i</mi> <mrow> <mi>a</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> </mrow> <mo>&rsqb;</mo> </mrow> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>&lsqb;</mo> <mrow> <msub> <mi>i</mi> <mi>a</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>i</mi> <mrow> <mi>a</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> </mrow> <mo>&rsqb;</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>L</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mfrac> <mrow> <msub> <mi>di</mi> <mrow> <mi>a</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>+</mo> <msub> <mi>R</mi> <mrow> <mi>l</mi> <mi>i</mi> <mi>n</mi> <mi>e</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>i</mi> <mrow> <mi>a</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>}</mo> <mo>&CenterDot;</mo> <mi>l</mi> <mo>+</mo> <msub> <mi>u</mi> <mrow> <mi>f</mi> <mi>r</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>Wherein, uaAnd i (t)a(t) it is respectively phase voltage and electric current that protective relaying device measurement obtains, ufr(t) it is the event of reconstruct Barrier point voltage, ia(0)(t) zero-sequence current obtained for protective relaying device measurement；Rline(1)And Lline(1)Respectively transmission line of electricity Unit length positive sequence resistance and reactance, Rline(0)And Lline(0)Respectively transmission line of electricity unit length zero sequence resistance and reactance；L is Result of calculation of the trouble point to protective relaying device installation place；Step (6), the differential equation group of formula (1) is solved using least-squares algorithm, obtain trouble point and protected to relay The result of calculation l of protection unit installation place distance, and make liter=l；Step (7), if tcal-t0<30ms, then next sampled point, and repeat step (2)~step (6) are moved to, calculated next Distance of the trouble point of individual sampled point to protection protective relaying device installation place；Otherwise, into step (8)；Step (8), according to step (7), obtain that moment t occurs in failure05ms is calculated to 30ms periods each sampled point afterwards Fault distance, due to failure occur moment t05ms is unstable to the fault distance result of calculation of 10ms periods afterwards, therefore utilizes Moment t occurs for failure010ms describes its degree of fluctuation to the fault distance result of calculation of 30ms periods afterwards, according to formula (2) coefficient of variation σ, is obtained,<mrow> <mi>&sigma;</mi> <mo>=</mo> <mo>|</mo> <mfrac> <mrow> <msub> <mi>l</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>l</mi> <mrow> <mi>m</mi> <mi>i</mi> <mi>n</mi> </mrow> </msub> </mrow> <mrow> <mo>(</mo> <msub> <mi>l</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>l</mi> <mi>min</mi> </msub> <mo>)</mo> <mo>/</mo> <mn>2</mn> </mrow> </mfrac> <mo>|</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>Wherein, lmaxAnd lminThe respectively maximum and minimum value of fault distance result of calculation；Step (9), according to the criterion shown in formula (3),To obtain failure be troubles inside the sample space or external area error for identification, it is ensured that the protection act behavior of protective relaying device it is correct Property.
- 2. the distance protecting method according to claim 1 for the transmission line of electricity containing THE UPFC, its feature It is：Step (3) the second order Butterworth LPF is used to filter out the high fdrequency component in measurement voltage, electric current, ensures The electrical quantity respectively measured in formula (1) in step (5) meets the initial parameter model of transmission line of electricity.
- 3. the distance protecting method according to claim 1 or 2 for the transmission line of electricity containing THE UPFC, it is special Sign is：The amplitude-frequency response characteristic of the second order Butterworth LPF, as shown in formula (4),<mrow> <mo>|</mo> <mi>H</mi> <mrow> <mo>(</mo> <mi>&omega;</mi> <mo>)</mo> </mrow> <msup> <mo>|</mo> <mn>2</mn> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mrow> <mn>1</mn> <mo>+</mo> <msup> <mrow> <mo>(</mo> <mi>&omega;</mi> <mo>/</mo> <msub> <mi>&omega;</mi> <mi>c</mi> </msub> <mo>)</mo> </mrow> <mn>4</mn> </msup> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>Wherein, ωcFor cut-off angular frequency.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109245058B (en) * | 2016-05-11 | 2021-01-01 | 许继集团有限公司 | UPFC-containing power transmission line rapid distance protection method and device |
| CN107104420B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of route distance suitable for THE UPFC access |
| CN107086549B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
| CN107026432B (en) * | 2017-05-26 | 2019-07-19 | 南京南瑞继保电气有限公司 | A kind of method and apparatus inhibiting influence of the compensator to route distance protection |
| CN108110741B (en) * | 2018-01-31 | 2019-07-09 | 国网浙江省电力有限公司电力科学研究院 | A kind of transmission line distance protecting method |
| CN109470990B (en) * | 2018-10-25 | 2020-12-18 | 南京南瑞继保电气有限公司 | Line variation fault direction judgment method and device suitable for UPFC access |
| CN110212499A (en) * | 2019-05-23 | 2019-09-06 | 昆明理工大学 | It is a kind of that UPFC and fixed series compensation C mixed compensation method for pilot protection of circuit are contained based on juxtaposition transformation |
| CN113567808B (en) * | 2021-07-26 | 2022-06-28 | 华北电力大学 | Unified power flow controller access line fault positioning method and system |
| CN114696304B (en) * | 2022-04-24 | 2023-04-07 | 天津大学 | Single-end quantity protection method of alternating current transmission line based on UPFC boundary |
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