CN103956713A - Direct-current transmission line protection configuration setting method with electromagnetic coupling relationship taken into consideration - Google Patents

Direct-current transmission line protection configuration setting method with electromagnetic coupling relationship taken into consideration Download PDF

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CN103956713A
CN103956713A CN201410128325.8A CN201410128325A CN103956713A CN 103956713 A CN103956713 A CN 103956713A CN 201410128325 A CN201410128325 A CN 201410128325A CN 103956713 A CN103956713 A CN 103956713A
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protection
fault
line
delta
voltage
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CN103956713B (en
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周全
邬乾晋
王海军
樊友平
别睿
涂莉
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Wuhan University WHU
Maintenance and Test Center of Extra High Voltage Power Transmission Co
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Wuhan University WHU
Maintenance and Test Center of Extra High Voltage Power Transmission Co
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Abstract

The invention discloses a direct-current transmission line protection configuration setting method with the electromagnetic coupling relationship taken into consideration. The method comprises the step one of line fault analysis and judgment, the step two of protection starting, the step three of pole logic selection, the step four of disturbance elimination and the step five of boundary determination. According to the method, the situation of possible occurrence of faults of a high-voltage direct-current transmission line is objectively and accurately taken into consideration, influence on normal poles from the faulty poles due to the electromagnetic coupling relationship among polar lines is also taken into consideration, the problem that existing protection is not comprehensive enough is solved, the logic is adjusted without replacing hardware of original line protection, the engineering availability is high, the disturbance-resisting capacity of high-voltage direct-current transmission line protection to false operation possibly occurring due to the electromagnetic coupling relationship is improved, the sensitivity and the effectiveness to the line faults are enhanced, and the unification of the technicality and the economy and the unification of the reliability and the sensitivity of high-voltage direct-current transmission line protection engineering are achieved.

Description

A kind of protection of direct current supply line configuration setting method of considering electromagnetic coupled relation
Technical field
The invention belongs to electric power system field of power transmission, especially relate to a kind of protection of direct current supply line configuration setting method of considering electromagnetic coupled relation.
Background technology
Along with the development of China's power industry, the application of high voltage dc transmission technology in long distance powedr transmission project is more and more extensive.According to statistics, by the end of 2006, the DC transmission engineering that oneself puts into operation was all over the world about 98.The high voltage dc transmission technology of China is just to start starting the eighties in 20th century, but development is very fast.China has 5 in the HVDC engineering of building at present, as shown in table 1-1.From Zhoushan DC transmission engineering in 1987, put into operation till in August, 2010, the built DC transmission engineering putting into operation of China has 15.Along with south electric network in June, 2010 Yunnan one Guangdong ± 800kV extra-high voltage direct-current engineering and in July, 2010 national grid to the putting into operation of family dam one Shanghai ± 800kV extra-high voltage direct-current engineering, China has become and has had that electric pressure is the highest in the world, transmission capacity is maximum, the country of the state-of-the-art extra-high voltage direct-current transmission engineering of technical merit.
Between DC line, there is electromagnetic coupled, coupled relation between each polar conductor produces can to direct current system steady operation and have a strong impact on, only the in the situation that of direct current system generation disturbance, as circuit occurs earth fault etc., the transient state component that fault produces can be because of electromagnetic coupled relation and the uneven polar conductor that waits cause influence normally to move to other of line parameter circuit value.The Electric Power Network Planning stage to DC power transmission line between electromagnetic coupled relation consider inentirely, often between circuit, electromagnetic coupled relation can cause the electromagnetic coupled misoperation between circuit, brings very big challenge to DC transmission system safe and reliable operation.4 bipolar locking accidents that Tianguang HVDC power transmission engineering has occurred since calendar year 2001 bipolar putting into operation, the accidents such as the wide extra-high voltage direct-current bipolar locking of " 8.19 " cloud all and between circuit electromagnetic coupled there is certain relation.
In DC power transmission line actual motion, arrangement mode between transmission line can make to exist between circuit multiple electromagnetic coupled relation, and the circuit fault that may suffer, as: thunder and lightning direct attack, thunderbolt, low resistance grounding fault, high resistance earthing fault etc.The circuit transient swing producing when a side line fault, capital is produced corresponding impact and whole DC transmission system is caused to fluctuation normal side by the electromagnetic coupled relation between circuit, becomes an important content of direct current transportation operation maintenance work.
In prior art situation, it is inconsiderate that hvdc transmission line protection exists electromagnetic coupled relation between polar curve, to the normal utmost point misoperation due to electromagnetic coupled and the problem of direct current system poor reliability.The DC operation of DC transmission system design time institute's reference of using is at present lacked experience; circuit actual conditions are considered abundant not; and protection exists on configuring, and means are simple, sensitivity is low, the problem of poor reliability; because of DC system locking due to electromagnetic coupled etc., all be there is to serious impact in DC transmission system.
Summary of the invention
The present invention is directed to the defect of above-mentioned prior art; proposed to consider the protection of direct current supply line configuration setting method of electromagnetic coupled relation, solved in prior art mesohigh direct current transportation resist technology the problem that affects on the normal utmost point extremely of the fault due to electromagnetic coupled relation between polar curve.
The present invention takes into full account the situation that various lines fault may occur, by circuit operating space, mainly comprises: the typical fault that may bring under railroad section fault, arrangement inversion side reverse fault, AC bus and line fault and various disturbance; By fault type, mainly comprise: the faults such as back flashover, thunderbolt, thunder and lightning interference, metallic earthing, high resistance ground.Consider that different faults has different reaction operating characteristicss, also needs to consider electromagnetic coupled relation between polar curve.In concrete configuration, for the impact of electromagnetic coupled on transmission system between the possibility that occurs of fault and DC power transmission line, complete paired fault is held targeted specifically effectively.The present invention is used as starting point with Practical Project; to consider the impact due to electromagnetic coupled relation between polar curve; making protection can successfully manage electromagnetic coupled pass is main purpose; effectively solved because of the protection misoperation problem of electromagnetic coupled relation to the generation of DC transmission system, make protection system can be sensitive, action quickly and efficiently.
For realizing above object, the present invention has taked following technical scheme: a kind of protection of direct current supply line configuration setting method of considering electromagnetic coupled relation, comprises the steps:
Step 1: line fault analysis judgement, determine HVDC (High Voltage Direct Current) transmission line type, by direct current system, identify the fault that this circuit is corresponding;
Step 2: protection starts, by gathering the voltage variety signal of existing protection installation place, polar curve road, calculating voltage Sudden Changing Rate, if surpass definite value, starting protection logic enters next step;
Its criterion starts definite value:
| Δ u Ri | > k R | Δ u Ii | > k I
In formula, i=1,2; R and I represent respectively rectification side and inversion side; k rand k ibe respectively the startup threshold value of circuit rectification side and inversion side protection criterion.
The protection of direct current supply line that it forms judge formula as
| Δ u Ri | / | Δ u Rj | > k R 1 q = sign ( MΔ u Ri ) = - 1 p = sign ( MΔ i Ri ) × sign ( MΔ i Ii ) = - 1
In formula, i=1,2,3,4; J=1,2,3,4; J ≠ i; M represents signal to carry out small echo change process; R and I represent respectively rectification side and inversion side; k r1for circuit rectification side the two poles of the earth voltage jump amount ratio setting value; M Δ i ri, M Δ i iirepresent respectively Δ i ri, Δ i iiwavelet modulus maxima; Sign (M Δ i ri), sign (M Δ i ii) represent respectively M Δ i ri, M Δ i iipolarity; Sign (M Δ u ri) expression Δ u rithe polarity of wavelet modulus maxima; Δ u riwith Δ u rjrepresent respectively the rectification side i utmost point and j polar curve road voltage variety; Δ i riwith Δ i iirepresent respectively rectification side and inversion side i polar curve road current change quantity;
Step 3: select utmost point logic, after protection logic starts, protection starts to calculate the ratio of the two poles of the earth voltage jump amount, if ratio surpasses k r1, very this utmost point of fault is described, for double-circuit line, enter step 4 ELIMINATION OF ITS INTERFERENCE; For single back line, proceed to protect logic, if voltage jump amount ratio surpasses k r2, in this explanation DC line, there is thunderbolt and disturbed, protection involution; If but voltage jump amount ratio does not surpass k r2, illustrate on circuit and break down, enter step 5 and carry out edge determination;
K described in step 3 r1for the two poles of the earth voltage jump amount ratio setting value, k r2for single back line protection logic is for distinguishing the voltage jump amount ratio setting value of thunderbolt interference and lightning fault;
Step 4: ELIMINATION OF ITS INTERFERENCE, protection is carried out wavelet transformation to voltage waveform, obtains the modulus maximum of the wavelet transformation under the 5th yardstick (dB5), if it is for negative, explanation is that thunder and lightning disturbs, protection involution, but if just, explanation is not that thunder and lightning disturbs, and enters edge determination;
Step 5: edge determination, rectification side and inversion side current signal are read in protection, and current signal is carried out to wavelet transformation, and judge whether to start route protection according to the polarity of the modulus maximum of both sides wavelet transformation; If the wavelet modulus maxima polarity of both sides electric current starts route protection on the contrary, otherwise protection involution.
Wherein: described in step 1 for single time and common-tower double-return direct current transmission line fault, to distinguish measure be mainly to determine in fault thunderbolt and interference thunderbolt, AC fault and commutation failure, route protection district and external area error etc. according to the difference of voltage jump amount.
It is to be the parameter value k in conjunction with concrete engineering parameter and the artificial setting of operating experience that voltage jump amount described in step 2 surpasses definite value rand k i, be respectively the startup threshold value that circuit rectification side and inversion side are protected criterion.
Wavelet transformation described in step 4 refers to the resulting modulus maximum of wavelet transformation based under the 5th yardstick.
Rectification side is read in protection described in step 5 and inversion side current signal is by collection, to protect the current change quantity signal gained of installation place.
Compared with prior art, tool has the following advantages in the present invention:
1, objective and considered exactly the situation that high voltage direct current transmission line fault may occur, and considered the extremely impact on the normal utmost point of the fault due to electromagnetic coupled relation between polar curve, made up not comprehensively problem of existing protection;
2, only need adjust in logic original route protection, only need are revised software logic and needn't be changed hardware, and engineering availability is strong;
3, guaranteeing under the prerequisite of protection Reliability of Microprocessor; improve HVDC (High Voltage Direct Current) transmission line protection and be related to misoperation antijamming capability to what may occur because of electromagnetic coupled; and strengthened the sensitivity of line fault and validity, realize the unification of technical and economy of HVDC (High Voltage Direct Current) transmission line protection engineering, the unification of reliability and sensitivity.
Accompanying drawing explanation
Accompanying drawing 1 is HVDC (High Voltage Direct Current) transmission system multiple faults reaction schematic diagram;
Accompanying drawing 2 is for considering the protection of direct current supply line collocation method figure of electromagnetic coupled relation between polar curve.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
Embodiment:
As shown in Figure 1, by engineering operation experience, learnt, the failure problems that may occur in HVDC (High Voltage Direct Current) transmission system has: line side fault F1 and F2; Rectification side bus or current conversion station fault F_R; Change of current side bus or current conversion station fault F_I.Concrete, while considering whole DC system fault, the line fault of consideration need be distinguished according to distance on line side and circuit, and wherein line fault is according to apart from rectification lateral extent 0%; 35%; 65%; 100% is divided into F1_1, F1_2, F1_3, F1_4.From line fault place polarity, be divided into F1 and F2.After fault occurs; usually can go out on the line existing ripple and temporary overvoltage etc.; the capacity effect existing between hvdc transmission line; capital makes to produce electromagnetic coupled relation between circuit, and the voltage waveform of the acute variation of fault side all can tie up to normal side through electromagnetic coupled pass and produce corresponding interference waveform.Under existing protection system, for current line electricity magnetic coupling, consider abundant not, cannot effective sensitive reply its impact on whole DC transmission system.
Be illustrated in figure 2 the protection of direct current supply line collocation method figure that considers electromagnetic coupled relation between polar curve.The protection of direct current supply line collocation method of considering electromagnetic coupled relation between polar curve is to consider under multiple possible breakdown; consider that the fault due to electromagnetic coupled relation between polar curve affects possible the misoperation perfecting due to utmost point impact; and in order to react the most delicately most effectively under prerequisite, the most effective solution putting forward.At the allocation plan shown in Fig. 2, main collocation method divides for five parts: step 1, step 2, step 3, step 4 and step 5, be depicted as respectively line fault analysis judgement, protection startup, select utmost point logic, ELIMINATION OF ITS INTERFERENCE and edge determination.
In step 1 line fault analysis judgement, mainly consider the different electromagnetic coupled relations due to different DC power transmission line arrangement modes, main fault distinguish determines that means are as follows:
A. the fault of considering electromagnetic coupled relation between single time DC power transmission line is definite:
1) while breaking down in single time DC power transmission line, the voltage variety of the fault utmost point is maximum, determines accordingly the fault utmost point;
2) polarity of the modulus maximum of electric current after wavelet transformation is not subject to the impact of transition resistance, and can utilize the electric current wavelet modulus maxima polarity of rectification side and inversion side, gets rid of DC line external area error.
3) in DC power transmission line generation thunderbolt situation, fault thunderbolt has all surpassed 2 with the fault pole tension Sudden Changing Rate of interference thunderbolt, in the situation that fault is struck by lightning, the ratio of the two poles of the earth voltage jump amount is greater than 2.5 and is less than 3.2, and in the situation that interference is struck by lightning, the ratio of the two poles of the earth voltage jump amount is greater than 3.5.Therefore can get rid of interference thunderbolt by the two poles of the earth voltage jump amount.Simultaneously, when DC line AC earth fault or AC fault occur outward causes the faults such as direct current commutation failure, voltage jump amount ratio is 1, therefore can get rid of AC fault and commutation failure with the ratio of the two poles of the earth voltage jump amount.
B. the fault of considering electromagnetic coupled relation between double back DC power transmission line is definite:
1), while breaking down in a DC power transmission line therein, the voltage variety of the fault utmost point is maximum, can determine whereby the fault utmost point.Because the voltage jump amount ratio on the fault utmost point and other three loop lines road is all greater than 2, and during AC fault, because the equipment on direct current system transmission line is arranged symmetrically with, its voltage jump amount ratio is 1, so can get rid of AC fault, commutation failure with the ratio of voltage Sudden Changing Rate.
2) polarity of the modulus maximum of electric current after wavelet transformation is not subject to the impact of transition resistance, and can utilize the electric current wavelet modulus maxima polarity of rectification side and inversion side, gets rid of DC line external area error.
3), in the situation that fault is struck by lightning, the modulus maximum of the wavelet transformation of the voltage of the fault utmost point is for just; When there is interference thunderbolt, the wavelet modulus maxima of the voltage of the disturbance utmost point, for negative, disturbs so can utilize voltage wavelet modulus maxima to get rid of thunder and lightning.
According to the fault determination method of electromagnetic coupled relation between above consideration polar curve, effectively considered the impact of electromagnetic coupled on whole DC transmission system between the limit, can effectively distinguish and definite fault.
In step 2 protection starts, the voltage variety signal of installation place is protected in protection by collection, calculating voltage Sudden Changing Rate, if surpass definite value, starting protection logic enters next link.Protect in addition the main criterion of institute's foundation to be:
| Δ u Ri | > k R | Δ u Ii | > k I
In formula, i=1,2; k rand k ibe respectively the startup threshold value of circuit rectification side and inversion side protection criterion.Utilize the ratio size of the voltage variety amplitude that two-wire line records can the Judging fault utmost point and get rid of AC fault, the situations such as commutation failure and thunderbolt interference; Utilize the polarity of modulus maximum of wavelet multi-scale analysis of jump-value of current whether contrary, can distinguish in DC line protection district and external area error; Utilizing the polarity of modulus maximum of the wavelet multi-scale analysis of voltage jump amount can get rid of thunderbolt disturbs.According to this, can form protection of direct current supply line criterion:
| Δ u Ri | / | Δ u Rj | > k R 1 q = sign ( MΔ u Ri ) = - 1 p = sign ( MΔ i Ri ) × sign ( MΔ i Ii ) = - 1
In formula, i=1,2,3,4; J=1,2,3,4; J ≠ i; M represents signal to carry out small echo change process; R and I represent respectively rectification side and inversion side; k r1for circuit rectification side the two poles of the earth voltage jump amount ratio setting value; M Δ i ri, M Δ i iirepresent respectively Δ i ri, Δ i iiwavelet modulus maxima; Sign (M Δ i ri), sign (M Δ i ii) represent respectively M Δ i ri, M Δ i iipolarity; Sign (M Δ u ri) expression Δ u rithe polarity of wavelet modulus maxima; Δ u riwith Δ u rjrepresent respectively the rectification side i utmost point and j polar curve road voltage variety; Δ i riwith Δ i iirepresent respectively rectification side and inversion side i polar curve road current change quantity.
In step 3, select in utmost point logic, after protection logic starts, protection starts to calculate the ratio of the two poles of the earth voltage jump amount, if ratio surpasses k r1, very this utmost point of fault is described.For double-circuit line, enter step 4 ELIMINATION OF ITS INTERFERENCE; For single back line, proceed to protect logic, if voltage jump amount ratio surpasses k r2, in DC line, there is thunderbolt and disturbed, protection involution.If but voltage jump amount ratio does not surpass k r2, illustrate on circuit and break down, enter step 5 edge determination.
In step 4 ELIMINATION OF ITS INTERFERENCE, protection is carried out wavelet transformation to voltage waveform, obtains the modulus maximum of the wavelet transformation under the 5th yardstick, if it is for negative, explanation is that thunder and lightning disturbs, protection involution, but if just, explanation is not that thunder and lightning disturbs, and enters edge determination.
In step 5 edge determination, rectification side and inversion side current signal are read in protection, and current signal is carried out to wavelet transformation, and judge whether to start route protection according to the polarity of the modulus maximum of both sides wavelet transformation.If the wavelet modulus maxima polarity of both sides electric current starts route protection on the contrary, otherwise protection involution.
Above-listed detailed description is for the illustrating of possible embodiments of the present invention, and this embodiment is not in order to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the scope of the claims of this case.

Claims (3)

1. a protection of direct current supply line configuration setting method of considering electromagnetic coupled relation, is characterized in that, comprises the steps:
Step 1: line fault analysis judgement, determine HVDC (High Voltage Direct Current) transmission line type, by direct current system, identify the fault that this circuit is corresponding;
Step 2: protection starts, by gathering the voltage variety signal of existing protection installation place, polar curve road, calculating voltage Sudden Changing Rate, if surpass definite value, starting protection logic enters next step;
Its criterion starts definite value:
| Δ u Ri | > k R | Δ u Ii | > k I
In formula, i=1,2; R and I represent respectively rectification side and inversion side; k rand k ibe respectively the startup threshold value of circuit rectification side and inversion side protection criterion;
The protection of direct current supply line that it forms judge formula as
| Δ u Ri | / | Δ u Rj | > k R 1 q = sign ( MΔ u Ri ) = - 1 p = sign ( MΔ i Ri ) × sign ( MΔ i Ii ) = - 1 ,
In formula, i=1,2,3,4; J=1,2,3,4; J ≠ i; M represents signal to carry out small echo change process; R and I represent respectively rectification side and inversion side; k r1for circuit rectification side the two poles of the earth voltage jump amount ratio setting value; M Δ i ri, M Δ i iirepresent respectively Δ i ri, Δ i iiwavelet modulus maxima; Sign (M Δ i ri), sign (M Δ i ii) represent respectively M Δ i ri, M Δ i iipolarity; Sign (M Δ u ri) expression Δ u rithe polarity of wavelet modulus maxima; Δ u riwith Δ u rjrepresent respectively the rectification side i utmost point and j polar curve road voltage variety; Δ i riwith Δ i iirepresent respectively rectification side and inversion side i polar curve road current change quantity;
Step 3: select utmost point logic, after protection logic starts, protection starts to calculate the ratio of the two poles of the earth voltage jump amount, if ratio surpasses k r1, very this utmost point of fault is described, for double-circuit line, enter step 4 ELIMINATION OF ITS INTERFERENCE; For single back line, proceed to protect logic, if voltage jump amount ratio surpasses k r2, in this explanation DC line, there is thunderbolt and disturbed, protection involution; If but voltage jump amount ratio does not surpass k r2, illustrate on circuit and break down, enter step 5 and carry out edge determination; Described k r2for single back line protection logic is for distinguishing the voltage jump amount ratio setting value of thunderbolt interference and lightning fault;
Step 4: ELIMINATION OF ITS INTERFERENCE, protection is carried out wavelet transformation to voltage waveform, obtains the modulus maximum of the wavelet transformation under the 5th yardstick, if it is for negative, explanation is that thunder and lightning disturbs, protection involution, but if just, explanation is not that thunder and lightning disturbs, and enters edge determination;
Step 5: edge determination, rectification side and inversion side current signal are read in protection, and current signal is carried out to wavelet transformation, and judge whether to start route protection according to the polarity of the modulus maximum of both sides wavelet transformation; If the wavelet modulus maxima polarity of both sides electric current starts route protection on the contrary, otherwise protection involution.
2. the protection of direct current supply line of consideration electromagnetic coupled relation as claimed in claim 1 configuration setting method, is characterized in that: the wavelet transformation described in step 4 refers to the resulting modulus maximum of wavelet transformation based under the 5th yardstick.
3. the protection of direct current supply line of consideration electromagnetic coupled relation as claimed in claim 1 configuration setting method, is characterized in that: rectification side is read in the protection described in step 5 and inversion side current signal is by collection, to protect the current change quantity signal gained of installation place.
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CN111628486A (en) * 2020-05-28 2020-09-04 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 Direct current line voltage abrupt change quantity protection misoperation prevention strategy and system
CN111800108A (en) * 2020-07-01 2020-10-20 浙江大学 Evaluation and suppression method for electromagnetic interference noise of rotary transformer
CN111800108B (en) * 2020-07-01 2022-03-25 浙江大学 Evaluation and suppression method for electromagnetic interference noise of rotary transformer

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