CN103683233A - Pilot protection method for automatically adapting power converse of power transmission line - Google Patents
Pilot protection method for automatically adapting power converse of power transmission line Download PDFInfo
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- CN103683233A CN103683233A CN201310717326.1A CN201310717326A CN103683233A CN 103683233 A CN103683233 A CN 103683233A CN 201310717326 A CN201310717326 A CN 201310717326A CN 103683233 A CN103683233 A CN 103683233A
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Abstract
The invention discloses a pilot protection method for automatically adapting power converse of a power transmission line. The pilot protection method comprises the following steps: utilizing protected identification elements in forward and backward directions to judge whether the power transmission line is in the condition of power converse according to the sequence of actions of the elements in forward and backward directions; calculating external fault breaker opening time and permissive command pilot protection channel transmission time, and when the power transmission line is judged to be in the condition of power converse, processing the two time to form an additional time delay, so that faulty action does not occur during the power converse through the additional time delay of pilot protection; when the power transmission line is judged to be not in the condition of power converse, not adding the additional time delay of pilot protection. The pilot protection method can prevent incorrect actions of pilot protection during power converse.
Description
Technical field
The present invention relates to the automatic adaptation transmission line power inverted orientation pilot protection implementation method of relaying protection in field of power.
Background technology
Along with Network Construction of Power Transmission is increasingly sophisticated, parallel lines on same tower double back, many times power transmission modes are in the common application of superhigh pressure, extra high voltage line.As shown in Figure 1; II loop line breaks down near M side outlet; this circuit M side circuit breaker mute time may be early than N side circuit breaker, and now changing appears in non-fault line I loop line power delivery direction, forms power inverted orientation and can cause I loop line pilot protection incorrect operation.Along with increasingly increasing of DC line, in AC-DC hybrid power grid, the rapid action feature of DC control protection is also easy to form power inverted orientation phenomenon on transmission line of alternation current.
Traditional pilot protection adapts to power inverted orientation and mainly takes following method: because when emergent power is swung to the opening velocity that depends on adjacent line circuit breaker; therefore supposition is greater than fixed value TA from adjacent line fault to the breaker open operation time difference; if after this line protection starts TA in the time period pilot protection do not move; all be considered as this circuit emergent power and swing to phenomenon; after this pilot protection action need to increase the constant time lag of TB, and the transmission delay of offside pilot protection signal on passage causes pilot protection misoperation when avoiding power inverted orientation.
And along with the development of technology, the quickening of breaker open operation speed, and in AC/DC network, direct current quick lock causes power direction to be changed fast, after adjacent line fault, this line is swung to very fast emergent power, thereby cause the TA time to choose difficulty, strengthen, cannot adapt to different system configurations; In addition; increasingly in short supply along with relay protecting private channel resource; increasing pilot protection adopts public network passage under special circumstances, and the public network channel transfer time is length and the no standard upper limit relatively, and the TB constant time lag that conventional pilot protection adopts cannot adapt to the different channel transfer time.Due to above-mentioned 2 reasons, cause traditional pilot protection when power inverted orientation owing to there is misoperation in positive direction element and locking (permission) signal sequence matching problem.
Just based on aforementioned analysis, the impact causing for pilot protection in order to solve transmission line power inverted orientation, this case produces thus.
Summary of the invention
Object of the present invention, is to provide a kind of longitudinal protection method of automatic adaptation transmission line power inverted orientation, pilot protection incorrect operation when it can avoid power inverted orientation.
In order to reach above-mentioned purpose, solution of the present invention is:
A longitudinal protection method for automatic adaptation transmission line power inverted orientation, comprises the steps:
(1) utilize the positive and negative direction recognition component of protection, whether emergent power is swung to situation according to both forward and reverse directions element action sequencing, to differentiate transmission line;
(2) calculate the external area error breaker open operation time and allow the formula order pilot protection channel transfer time, when judging that transmission line emergent power is swung to, aforementioned two times are processed and form additional delay, by pilot protection additional delay, make it that misoperation not occur when power inverted orientation; When being judged to be non-power and swinging to, pilot protection does not increase additional delay.
The concrete method of discrimination of above-mentioned steps (1) is: according to protection positive and negative direction recognition component action situation, if present recognition component in the other direction, first move, the feature of moving after positive direction recognition component, thinks that this transmission line emergent power swings to situation.
In above-mentioned steps (2), allow the account form of formula order pilot protection channel transfer time T _ TRANS to be: to calculate in real time protection recognition component action in the other direction and passage and receive the time difference that allows signal.
In above-mentioned steps (2), the computational methods of external area error breaker open operation time T _ REV are: the time difference of calculating in real time this side protection recognition component action in the other direction and returning.
The detailed content of above-mentioned steps (2) is: when identification circuit emergent power is swung to, for the formula of permission order pilot protection, by channel transfer time T _ TRANS and the external area error breaker open operation time T _ REV of real-time calculating, both compare to get the small value and are assigned to the additional delay T_add of pilot protection, after pilot protection operation condition meets, through T_add additional delay pilot protection, just move; For enclosed type order pilot protection, get T_add=T_REV, after pilot protection operation condition meets, through T_add additional delay pilot protection, just move.
Adopt after such scheme; the feature that after the present invention utilizes protection to start, element moves prior to positive direction element in the other direction; identification transmission line emergent power is swung to; the direction component identification power inverted orientation situation that protection forms according to input voltage and input current amount; pilot protection incorrect operation while avoiding power inverted orientation by increasing additional delay, the present invention can adapt to alternating current-direct current series-parallel connection electric power transmission network, breaker open operation and the situation of various channel transfer times at a high speed.
Accompanying drawing explanation
Fig. 1 is double back transmission line schematic diagram;
Fig. 2 is that the present invention identifies power inverted orientation state logic figure;
Wherein,
A represents when recognition component meets in the other direction to export 1, otherwise output 0;
B represents when positive direction recognition component meets to export 1, otherwise output 0;
C represents " startup time delay " logic, when input is during by 0 change 1, through time delay t1 output 1,0 constant or when 1 becomes 0 when being input as, and without time delay, directly allows output equal input;
D represents " returning to time delay " logic, when input is during by 1 change 0, through time delay t2 output 0,1 constant or when 0 becomes 1 when being input as, and without time delay, directly allows output equal input;
E represents AND gate operation;
F represents " power inverted orientation state " identification output.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 1, be the applied double back transmission line schematic diagram of the present invention, wherein, protection is installed on I loop line both sides.When II loop line M side outlet breaks down, II loop line M side circuit breaker BRK3 is prior to N side separating brake.After II loop line M side circuit breaker BRK3 separates, I loop line is swung to situation by emergent power.
The longitudinal protection method that the invention provides a kind of automatic adaptation transmission line power inverted orientation, comprises the steps:
(1) utilize the action sequencing of the positive and negative direction recognition component (comprising the direction components such as distance, zero sequence, variable quantity) of protection to differentiate the transmission line situation whether emergent power is swung to;
Shown in Fig. 1, when II loop line breaks down near M side, the opposite direction recognition component of I loop line M side protection will move; After II loop line M side circuit breaker BRK3 separating brake causes I loop line emergent power to swing to, the positive direction recognition component of I loop line M side protection will move.After utilizing just protection to start, recognition component is prior to the feature of positive direction recognition component action in the other direction in the present invention, and power inverted orientation has appearred in identification transmission line.
(2) calculate the external area error breaker open operation time and allow the formula order pilot protection channel transfer time, when judging that transmission line emergent power is swung to, aforementioned two times are processed and form additional delay, by pilot protection additional delay, make it that misoperation not occur when power inverted orientation; When being judged to be non-power and swinging to, pilot protection does not increase additional delay.
Specifically, cancel the constant time lag TB that traditional pilot protection increases for power inverted orientation, calculate in real time breaker open operation time and channel transfer time formation additional delay T_add, this additional delay calculates in the following way:
After protection starts, recognition component action in the other direction starts timing, and recognition component returns and stops timing in the other direction.This timing length T_REV can reflect that adjacent line occurs to breaker open operation duration from fault;
When pilot protection adopts the order of permission formula: after protection starts, recognition component action in the other direction starts timing, when receiving that offside pilot protection stops timing while allowing signal.This timing length T_TRANS can reflect the time delay of permission formula order pilot protection channel transfer.
According to the above-mentioned time calculating in real time, join protection power inverted orientation identification situation, forms pilot protection additional delay T_add, specific as follows.
For allowing formula order pilot protection:
When differentiating for power inverted orientation, get T_REV and T_TRANS smaller value as pilot protection action additional delay T_add;
When differentiation is swung to for non-power, pilot protection action additional delay T_add is set to 0.
For enclosed type order pilot protection:
When differentiating for power inverted orientation, get T_REV as pilot protection action additional delay T_add;
When differentiation is swung to for non-power, pilot protection action additional delay T_add is set to 0.
During transmission line generation power inverted orientation, protection identifies this situation according to both forward and reverse directions element sequence of movement, increases additional delay T_add, avoids pilot protection misoperation; During transmission line generating region internal fault, unidentified is power inverted orientation, and protection is without additional delay action excision fault.
In conjunction with Fig. 2, when II loop line breaks down, the recognition component action in the other direction of I loop line M side; After II loop line M side circuit breaker BRK3 separates, the action of I loop line M side positive direction discriminating element, presents recognition component in the other direction and first moves, and after positive direction recognition component, moves, and meets power inverted orientation feature, through this logic discrimination, is power inverted orientation.
The additional delay T_add that pilot protection adapts to power inverted orientation is calculated in protection simultaneously after starting, in the situation that being identified as power inverted orientation, calculate as follows.
If pilot protection adopts the order of permission formula:
After the protection of I loop line starts, recognition component action in the other direction starts timing, and recognition component returns and stops timing in the other direction, and this timing result is designated as to T_REV;
After the protection of I loop line starts, recognition component action in the other direction starts timing, when receiving that offside pilot protection stops timing while allowing signal.This timing result is designated as to T_TRANS;
T_add=min(T_REV,T_TRANS)
If pilot protection adopts enclosed type order:
After the protection of I loop line starts, recognition component action in the other direction starts timing, and recognition component returns and stops timing in the other direction, and this timing result is designated as to T_REV.
T_add=T_REV
When being identified as in the situation that non-power swings to, for permission formula and blocking mode pilot protection, additional delay is all taken as zero, that is:
T_add=0
After pilot protection operation condition meets (positive direction meet and receive permission signal), through T_add additional delay pilot protection, just move outlet.
Utilize both forward and reverse directions recognition component action sequencing, identification power inverted orientation; Automatically calculate additional delay, to pilot protection, action increases corresponding time delay, avoids occurring misoperation in power inverted orientation situation.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (5)
1. automatically adapt to a longitudinal protection method for transmission line power inverted orientation, it is characterized in that comprising the steps:
(1) utilize the positive and negative direction recognition component of protection, whether emergent power is swung to situation according to both forward and reverse directions element action sequencing, to differentiate transmission line;
(2) calculate the external area error breaker open operation time and allow the formula order pilot protection channel transfer time, when judging that transmission line emergent power is swung to, aforementioned two times are processed and form additional delay, by pilot protection additional delay, make it that misoperation not occur when power inverted orientation; When being judged to be non-power and swinging to, pilot protection does not increase additional delay.
2. the longitudinal protection method of a kind of automatic adaptation transmission line power inverted orientation as claimed in claim 1; it is characterized in that: the concrete method of discrimination of described step (1) is: according to protection positive and negative direction recognition component action situation; if presenting recognition component in the other direction first moves; the feature of moving after positive direction recognition component, thinks that this transmission line emergent power swings to situation.
3. the longitudinal protection method of a kind of automatic adaptation transmission line power inverted orientation as claimed in claim 1; it is characterized in that: in described step (2); calculate in real time protection recognition component action in the other direction and passage and receive the time difference T_TRANS that allows signal, this value reflection permission formula order pilot protection one direction channel transfer time.
4. the longitudinal protection method of a kind of automatic adaptation transmission line power inverted orientation as claimed in claim 1; it is characterized in that: in described step (2); the time difference T_REV that calculates in real time this side protection recognition component action in the other direction and return, this value reflection external area error breaker open operation time.
5. the longitudinal protection method of a kind of automatic adaptation transmission line power inverted orientation as described in any one in claim 1 to 4, the detailed content that it is characterized in that described step (2) is: when identification circuit emergent power is swung to, for the formula of permission order pilot protection, by channel transfer time T _ TRANS and the external area error breaker open operation time T _ REV of real-time calculating, both compare to get the small value and are assigned to the additional delay T_add of pilot protection, after pilot protection operation condition meets, through T_add additional delay pilot protection, just move; For enclosed type order pilot protection, get T_add=T_REV, after pilot protection operation condition meets, through T_add additional delay pilot protection, just move.
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| CN201310717326.1A CN103683233B (en) | 2013-12-24 | 2013-12-24 | A kind of longitudinal protection method of automatic adaptation transmission line of electricity power inverted orientation |
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Cited By (3)
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| CN104362600A (en) * | 2014-10-31 | 2015-02-18 | 国家电网公司 | New energy based integrated configuration method for alternating current transmission line unit protection |
| CN105006809A (en) * | 2015-08-07 | 2015-10-28 | 南京南瑞继保电气有限公司 | Power converse determination method of longitudinal protection of double-circuit line of intelligent transformer station |
| CN107732882A (en) * | 2017-11-22 | 2018-02-23 | 广东电网有限责任公司电力调度控制中心 | A kind of hvdc transmission line direction pilot protection method |
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Cited By (3)
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| CN104362600A (en) * | 2014-10-31 | 2015-02-18 | 国家电网公司 | New energy based integrated configuration method for alternating current transmission line unit protection |
| CN105006809A (en) * | 2015-08-07 | 2015-10-28 | 南京南瑞继保电气有限公司 | Power converse determination method of longitudinal protection of double-circuit line of intelligent transformer station |
| CN107732882A (en) * | 2017-11-22 | 2018-02-23 | 广东电网有限责任公司电力调度控制中心 | A kind of hvdc transmission line direction pilot protection method |
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