CN104269812A - Digital protection communication interruption detection method applicable to metro medium-voltage power supply system - Google Patents
Digital protection communication interruption detection method applicable to metro medium-voltage power supply system Download PDFInfo
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- CN104269812A CN104269812A CN201410573208.2A CN201410573208A CN104269812A CN 104269812 A CN104269812 A CN 104269812A CN 201410573208 A CN201410573208 A CN 201410573208A CN 104269812 A CN104269812 A CN 104269812A
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Abstract
The invention discloses a digital protection communication interruption detection method which is applicable to digital protection communication interruption detection for a substation in a metro medium-voltage power supply system. In a combined way of ordinary detection and novel real-time detection, by the digital protection communication interruption detection method, GOOSE (Generic object oriented substation event) communication interruption state can be quickly diagnosed, a communication overcurrent protection function can be rightly locked in real time, and a GOOSE network load can be effectively reduced; the digital protection communication interruption detection method is a simple, rapid and high-applicability GOOSE communication interruption detection scheme.
Description
Technical field
The present invention relates to subway Medium voltage power supply system digital protection field.The invention provides a kind of Novel transformer substation GOOSE data communication and interrupt detection method, can quick diagnosis GOOSE communication interruption condition, the correctly communication of locking in real time overcurrent protection function.
Background technology
It is main protection that subway Medium voltage power supply system transformer station generally arranges fibre-optic current differential, and arranging overcurrent protection is backup protection.And standby overcurrent protection conventional in bigdos supply power mode situation cannot meet the requirement of protection to selectivity, quick-action very well, therefore the current communication current defencive function that adds in standby current protection is the good solution of one solving this problem.Communication current Sustainable use IEC61850 stipulations, adopt the signals such as the protection of GOOSE network transfer of data starts, locking jumped by connection, the position signalling of switch, can realize selectivity tripping operation or protection blocking function according to these signal protection devices.If GOOSE communication disruption will directly affect the transmission of block signal, digital communication over-current protection malfunction is caused to be done, therefore need by the real-time locking of communication overcurrent protection function during communication disruption.So GOOSE communication disruption detected in time, and accurately judge that the equipment of GOOSE communication disruption seems particularly important fast.
Accompanying drawing 1 provides GOOSE message transmission mechanism, and the method for conventional sense GOOSE communication disruption is as follows:
1) GOOSE message sends the mechanism adopting heartbeat message and displacement message quick repeats to combine.In GOOSE message transmitting procedure, if a general data-bag lost, need to retransmit identical bag for several times, in the packet of this sequential delivery, comprise " allow a time-to-live " information, it act as the maximum duration interval that reminder-data bag receiving terminal waits for next retransmission data packet may; If receiving terminal does not receive corresponding retransmission data packet may within this time interval, receiving terminal is diagnosable GOOSE link fails just, is judged as GOOSE communication disruption.
2) in transmission heartbeat GOOSE message situation, every T
0time sends a frame message, and in such message, state is number constant, and serial number increases progressively.When sending displacement GOOSE message, after sending a frame re-transmission message, with time interval T
1, T
1, T
2, T
3quick repeats displacement message.Whether the receiving terminal of GOOSE message can diagnose link to interrupt according to whether receiving message in " allowing the time-to-live ".Common detection methods diagnosis GOOSE communication disruption required time is adopted to be generally 2T
0.
The network bandwidth, sample frequency and CPU disposal ability are the maximum constrained that GOOSE protects transmission performance.Bandwidth determines the maximum number of MAC message in constant service time, if network interface card overflow probability is very high when sample frequency is high.If network interface card spilling can cause whole Chief Web Officer time large area packet loss, cause whole system communication disruption, harmfulness is very large.The disposal ability of CPU also directly affects the disposal ability of GOOSE message, greatly affects GOOSE message drop probabilities.If then system is taked conventional sense mode to GOOSE communication and is shortened T for minimizing system to the communication disruption reaction time
0(be generally 5s or larger) and retransmit interval time of message, can occupied bandwidth, has influence on the disposal ability of CPU, can work the mischief to system communication.
Summary of the invention
For problems of the prior art; the present invention is on the basis of conventional sense GOOSE communication disruption; add fast detecting communication disruption scheme; the program sends protection after utilizing the protection of line protective device to start and starts GOOSE signal; return Received signal strength after the protective devices such as relevant feeder line detect this enabling signal, inlet-outlet line device just shows that this communication loop state is normal after receiving the Received signal strength that feeder line returns.
This detection method is applicable to subway Medium voltage power supply system digital protection field, is that detection method is interrupted in a kind of Novel transformer substation GOOSE data communication, can quick diagnosis GOOSE communication interruption condition, the correctly communication of locking in real time overcurrent protection function.
The technical solution used in the present invention is: it is as follows that one is applicable to subway Medium voltage power supply system digital protection communication disruption detection method:
1, during stable state by judging that 2 times retransmit in message time period and whether receive GOOSE signal and judge whether communication disruption, this judgement time is level second, can revise T0 to arrange detection time;
2, judge whether communication disruption by transmitting protection and starting GOOSE signal and receive the feedback GOOSE signal of relevant protection device when protection starts, this deterministic process can be arranged detection time, minimumly only needs 30ms; Illustrate for inlet wire:
Step one: send protection after incoming relay-protection device overcurrent starts and start GOOSE signal;
Step 2: after the offside that inlet wire communication overcurrent protection is associated, outlet, feeder line, bus bar connector receive incoming relay-protection startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: incoming relay-protection device receive respectively within the communication check stand-by period offside, outlet, feeder line, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking inlet wire.
The pattern that real time communication detection scheme when protective device is started by communication check scheme during conventional stable state and protection combines promptly and accurately can detect communications status between device; when breaking in the communications, energy correct locking communication overcurrent protection, avoids protection misoperation.Because real time communication detection scheme used time when protection starts is short; corresponding communication overcurrent protection can be adjusted 50ms or shorter time operate time; meet the quick-action requirement of protection, also provide technical foundation for communication overcurrent protection replaces conventional fibre-optic current differential protection.
Useful achievement of the present invention is: the measuring ability achieving the GOOSE communication disruption of digital protection; meet the rapidity of GOOSE communication disruption detection, the requirement of accuracy; also network load is not increased when stable state; be a kind of simple, fast, detection scheme that applicability is strong, this scheme of the invention has broad application prospects.
Accompanying drawing explanation
Fig. 1 GOOSE message transmission mechanism.
In figure, T
0-retransmit message time period when not having that event occurs; (T
0)-event causes retransmitting the time interval shortened at message interval; T
1displacement message shortest time interval is transmitted after-event occurs; T
2, T
3-retransmit time interval of displacement message when reaching stable condition.
Fig. 2 inlet wire communication overcurrent protection-busbar fault logic diagram.
Fig. 3 subway Medium voltage power supply system winding diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present invention is applied to subway Medium voltage power supply system digital protection field, is that detection method is interrupted in a kind of Novel transformer substation GOOSE data communication, can quick diagnosis GOOSE communication interruption condition, the correctly communication of locking in real time overcurrent protection function.It is characterized in that:
The mode adopting conventional sense to combine with novel real-time detection realizes;
Conventional sense is that stable state detects, by judging that whether receiving GOOSE signal in 2 times of re-transmission message time period judges whether communication disruption, can revise T0 to arrange detection time.
Be detected as detection when protection starts in real time, judge whether communication disruption by transmitting protection and starting GOOSE signal and receive the feedback GOOSE signal of relevant protection device, this deterministic process can be arranged detection time, minimumly only needs 30ms; Illustrate for inlet wire:
Step one: send protection after incoming relay-protection device overcurrent starts and start GOOSE signal;
Step 2: after the offside that inlet wire communication overcurrent protection is associated, outlet, feeder line, bus bar connector receive incoming relay-protection startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: incoming relay-protection device receive respectively within the communication check stand-by period offside, outlet, feeder line, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking inlet wire.
The communication overcurrent protection of subway Medium voltage power supply system is started by the protection of this switch over-current and adjacent related switch overcurrent protection does not start and judges; example is judged as with the busbar fault of inlet wire of substation; concrete logic is shown in accompanying drawing 2; related switch overcurrent protection enabling signal is transmitted by GOOSE communication, when with need locking to communicate overcurrent protection during relevant apparatus GOOSE communication disruption.
For 101 service entrance switchs of electric substation 2 in the subway Medium voltage power supply system winding diagram of accompanying drawing 3; when 101 switch overcurrent protections of electric substation 2 start; if the outlet 103 of electric substation 2, mother 100, feeder line 111 all overcurrent protection do not start; and 101 to communicate with these 3 devices normally then report communication overcurrent protection action, are judged as busbar fault.
The testing process of communication disruption is described with the communication process of 101 switches of electric substation 2 and feeder line 111 below.
1) when there is no the stable situation conjugated, 101 protective devices receive the GOOSE information of 111 devices transmissions with T0 interval, if the T0 of 2 times does not also receive GOOSE information interval time, be judged as 101 and 111 device communication disruption, device sends out warning information, locking communication overcurrent protection;
2) 101 overcurrent protections start rear 101 protections and start GOOSE signal; 111 protections receiving 101 to start after GOOSE signal then transmission and reception feedback GOOSE signal; 101 feedback signals receiving 111 within the communication check stand-by period of presetting just judge to communicate normally with 111; if do not receive the feedback signal of 111, be judged to be the communication disruption with 111, the communication overcurrent protection of real-time locking 101.
The detection scheme of outlet 101 switch of 101 switches and mother 100, feeder line 111, electric substation 1 is similar, no longer repeats.
IEC61850 regulation GOOSE signal network communication delay should be less than 4ms; consider that also there is about 5ms at the general interval of unit protection logic task; this deterministic process includes 2 GOOSE signals transmissions; then maximum delay is the 4ms+5ms of 2 times; namely this real time communication detection scheme judges that communication disruption required time is not more than 18ms; consider reserved regular hour nargin, can arrange the communication check stand-by period is 30ms.
Because have employed Focus real-time when protection starts, stable state transmission T0 interval time when not conjugating just can adjust in a conventional manner, decreases GOOSE bandwidth occupancy, improves network communication status.
Because communicating, the delay time of overcurrent protection should be greater than the communication check stand-by period, correctly locking could to communicate overcurrent protection, avoid protection misoperation time disconnected so in the communications.Adopt the detection used time of real time communication detection scheme short; corresponding communication overcurrent protection delay time can be adjusted 50ms or shorter time; meet the quick-action requirement of protection; also provide technical foundation for communication overcurrent protection replaces conventional optical differential main protection, create advantage for communication overcurrent protection is promoted at the protection application of subway Medium voltage power supply system.
Although the present invention with preferred embodiment openly as above; but embodiment and accompanying drawing are not for limiting the invention, being anyly familiar with this those skilled in the art, without departing from the spirit and scope of the invention; can make various changes or retouch, equally within protection scope of the present invention from working as.What therefore protection scope of the present invention should define with the claims of the application is as the criterion.
Claims (8)
1. be applicable to a subway Medium voltage power supply system digital protection communication disruption detection method, adopt conventional sense and detect the mode combined in real time, it is characterized in that:
Conventional sense: by judging that whether receiving GOOSE signal in twice re-transmission message time period judges whether communication disruption during stable state, this judgement time is level second, can revise T0 to arrange detection time;
Real-time detection: protect the feedback GOOSE signal starting GOOSE signal and receive relevant protection device to judge whether communication disruption by transmitting when protection starts, this deterministic process can be arranged detection time, and this judgement time is Millisecond.
2. digital protection communication disruption detection method according to claim 1, is characterized in that, when detecting inlet wire in real time:
Step one: send protection after incoming relay-protection device overcurrent starts and start GOOSE signal;
Step 2: after the offside that inlet wire communication overcurrent protection is associated, outlet, feeder line, bus bar connector receive incoming relay-protection startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: incoming relay-protection device receive respectively within the communication check stand-by period offside, outlet, feeder line, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking inlet wire.
3. digital protection communication disruption detection method according to claim 1, is characterized in that, when detecting outlet in real time:
Step one: send protection after outlet wire protecting device overcurrent starts and start GOOSE signal;
Step 2: after the offside that outlet communication overcurrent protection is associated, inlet wire, feeder line, bus bar connector receive outlet protection startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: outlet wire protecting device receive respectively within the communication check stand-by period offside, inlet wire, feeder line, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking outlet.
4. digital protection communication disruption detection method according to claim 1, is characterized in that, when detecting offside in real time:
Step one: send protection after offside protective device overcurrent starts and start GOOSE signal;
Step 2: after the inlet wire that offside communication overcurrent protection is associated, outlet, feeder line, bus bar connector receive offside protection startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: offside protective device receive respectively within the communication check stand-by period inlet wire, outlet, feeder line, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking offside.
5. digital protection communication disruption detection method according to claim 1, is characterized in that, when detecting feeder line in real time:
Step one: send protection after feeder protection equipment overcurrent starts and start GOOSE signal;
Step 2: after the offside that feeder line communication overcurrent protection is associated, outlet, inlet wire, bus bar connector receive protection for feed line startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: feeder protection equipment receive respectively within the communication check stand-by period offside, outlet, inlet wire, bus bar connector reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking feeder line.
6. digital protection communication disruption detection method according to claim 1, is characterized in that, when detecting mother in real time:
Step one: send protection after mother protective device overcurrent starts and start GOOSE signal;
Step 2: after the offside that mother communication overcurrent protection is associated, outlet, feeder line, line leading device receive protection for feed line startup GOOSE signal, GOOSE signal is fed back in transmission and reception;
Step 3: mother protective device receive respectively within the communication check stand-by period offside, outlet, feeder line, line leading device reception feedback GOOSE signal be then judged to be normal with communicating of these devices; otherwise be judged to be communication disruption, the communication overcurrent protection of locking mother.
7., according to the digital protection communication disruption detection method one of claim 2 to 6 Suo Shu, it is characterized in that:
During the stable state of protective device by conventional sense communication judge and the protection that detects in real time starts time real time communication judge promptly and accurately communications status between device detected, can correct locking communication overcurrent protection time disconnected in the communications, avoid protection misoperation.
8. digital protection communication disruption detection method according to claim 7, is characterized in that:
Related switch overcurrent protection enabling signal is transmitted by GOOSE communication, when with need locking to communicate overcurrent protection during relevant apparatus GOOSE communication disruption.
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Cited By (2)
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| CN108493911A (en) * | 2018-05-02 | 2018-09-04 | 中铁第四勘察设计院集团有限公司 | Pressure ring network protection method in a kind of magnetic floating traffic |
| CN110165639A (en) * | 2019-05-06 | 2019-08-23 | 石家庄科林电气股份有限公司 | A kind of method that distribution terminal operating mode automatically switches |
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| CN101969229A (en) * | 2010-09-16 | 2011-02-09 | 广东电网公司茂名供电局 | On-line monitoring method for secondary circuit |
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| CN108493911A (en) * | 2018-05-02 | 2018-09-04 | 中铁第四勘察设计院集团有限公司 | Pressure ring network protection method in a kind of magnetic floating traffic |
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| CN110165639A (en) * | 2019-05-06 | 2019-08-23 | 石家庄科林电气股份有限公司 | A kind of method that distribution terminal operating mode automatically switches |
| CN110165639B (en) * | 2019-05-06 | 2021-04-02 | 石家庄科林电气股份有限公司 | Method for automatically switching working modes of power distribution terminal |
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