CN114062853B - Feeder line fault distance measurement method and device in 50% standby mode of compound line direct supply - Google Patents
Feeder line fault distance measurement method and device in 50% standby mode of compound line direct supply Download PDFInfo
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Abstract
The invention relates to a feeder line fault location method and a device under a 50% standby mode of complex line direct supply, wherein the method comprises the following steps: when the GS link is normal, performing fault location by adopting a GOOSE uplink-downlink current ratio; judging whether the fault meets the steady-state characteristic or not; if the steady-state characteristics are met, ranging according to the steady-state characteristics; if the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic. According to the technical scheme provided by the invention, on the premise of not re-planning the design of the secondary circuit of the transformer substation and increasing hardware, GOOSE analog quantity information is transmitted between the station control layers, the electrical connection between devices is reduced, a physical circuit is replaced by distributed sampling, the current on the side and the current on the opposite side are ensured to be reliably locked when faults occur, and the problem of the distance measurement data synchronization of the distributed sampling is solved.
Description
Technical Field
The invention relates to the technical field of power distribution network fault handling, in particular to a feeder line fault location method and device in a 50% standby mode of double-line direct supply.
Background
In the electrified railway under the direct supply mode, a compound line direct supply wiring mode of parallel connection of the upper and lower lines is generally adopted to improve the power supply capacity of the traction network. Because of the trans-impedance existing between the uplink and the downlink, the traction network with the complex line direct-supply wiring mode has larger reactance ranging error, and the fault ranging is generally carried out by adopting an uplink and downlink current ratio method capable of eliminating the influence of the trans-impedance.
When the line fails in the 50% standby power supply mode, the positions of the short-circuit points are different, the uplink and downlink feeder line protection devices can be simultaneously protected and started, one side is started, and the other side is not started, if a mode that three spaced currents are mutually connected into the opposite side spacing device by adopting a cable is adopted, besides the engineering implementation difficulty, the problems of large cable consumption, complex current loop caused by excessive number of secondary windings, electromagnetic compatibility and the like are also caused.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide a feeder line fault location method and device in a double-line direct supply 50% standby mode, and on the premise of not re-planning the design of a secondary circuit of a transformer substation and increasing hardware, GOOSE analog quantity information is transmitted between station control layers, so that electrical connection between devices is reduced, a physical circuit is replaced by distributed sampling, current on the side and current on the opposite side in the fault locking process are guaranteed reliably, and the problem of distance measurement data synchronization of distributed sampling is solved.
In order to achieve the above object, according to one aspect of the present invention, there is provided a feeder line fault location method in a 50% standby mode with a complex line direct supply, including the steps of:
when the GS link is normal, performing fault location by adopting a GOOSE uplink-downlink current ratio;
judging whether the fault meets the steady-state characteristic or not;
If the steady-state characteristics are met, ranging according to the steady-state characteristics;
If the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic.
Further, if the GS link is abnormal or if the steady state characteristic is not satisfied and the fault change amount characteristic is not satisfied, performing fault location by adopting a reactance location method.
Further, the meeting the steady state characteristics includes: the fault current at two sides is larger than the protection starting current fixed value at the same time.
Further, the meeting the fault variance feature includes: and the bus voltage becomes small during faults, and the feeder line current becomes abrupt.
Further, the ranging according to the steady state characteristic includes:
Buffering the effective value of the ranging current at two sides of the feeder line;
And mutually transmitted to opposite sides through the GS link.
Further, the fault location according to the fault variable quantity feature includes:
buffering effective values of ranging currents at two sides of a feeder line, and mutually transmitting current effective values of M continuous points through a GS link;
calculating the uplink and downlink current ratio and the current ratio difference according to a time sequence;
judging whether the difference value of the continuous N current ratios is smaller than an allowable error threshold value or not; if yes, selecting the current on the side with the smallest current ratio difference value and the current on the opposite side to perform fault location; if not, returning to the first step.
Further, the up-down current ratio is calculated according to the following formula:
Wherein, Q i is the ratio of the uplink current to the downlink current at the ith point, I i is the effective value of the fault current at the present side of the ith point, and I DCi is the effective value of the fault current at the opposite side of the ith point.
Further, the current ratio difference is calculated in time sequence according to the following formula:
ΔQ＝|Qi+1-Qi|i＝1，2，3，......M
Wherein Δq is the current ratio difference.
According to a second aspect of the present invention, there is provided a feeder line fault location method based on GOOSE communication, including the steps of:
Identifying the operation mode of the feeder line; if the method is a double-line direct supply 50% standby mode, performing fault location by adopting the method according to the first aspect of the invention; if the current is in other modes, the distance measurement is carried out by adopting an uplink-downlink current ratio distance measurement method, and the distance measurement currents at two sides are locked.
According to a third aspect of the invention, a feeder line fault location device in a 50% standby mode is provided, which comprises a reactance ranging method ranging module, a steady-state characteristic ranging module and a fault variation characteristic ranging module; wherein,
The reactance ranging method ranging module is used for performing fault ranging by adopting a reactance ranging method when the GS link is abnormal or if the GS link does not meet the steady-state characteristic and the fault variation characteristic is not met;
the steady-state characteristic distance measurement module is used for carrying out fault distance measurement by adopting steady-state characteristics when the steady-state characteristics are met;
The fault variable quantity characteristic distance measurement module is used for carrying out fault distance measurement according to the fault variable quantity characteristic when the steady state characteristic is not met but the fault variable quantity characteristic is met.
In summary, the present invention provides a method and an apparatus for ranging feeder line faults in a 50% standby mode by using a complex line, where the method includes the following steps: when the GS link is normal, performing fault location by adopting a GOOSE uplink-downlink current ratio; judging whether the fault meets the steady-state characteristic or not; if the steady-state characteristics are met, ranging according to the steady-state characteristics; if the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic. According to the technical scheme provided by the invention, on the premise of not re-planning the design of the secondary circuit of the transformer substation and increasing hardware, GOOSE analog quantity information is transmitted between the station control layers, the electrical connection between devices is reduced, a physical circuit is replaced by distributed sampling, the current on the side and the current on the opposite side are ensured to be reliably locked when faults occur, and the problem of the distance measurement data synchronization of the distributed sampling is solved.
Drawings
FIG. 1 is a schematic diagram of a 50% standby mode traction network and analog wiring;
FIG. 2 is a schematic waveform diagram of a fault current entering a steady state at a line fault;
FIG. 3 is a schematic diagram of fault-based steady-state feature ranging synchronization;
FIG. 4 is a schematic diagram of fault-variance-based feature ranging synchronization;
fig. 5 is a flowchart of a feeder line fault location method based on GOOSE communication according to an embodiment of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
In the electrified railway under the direct supply mode, a compound line direct supply wiring mode of parallel connection of the upper and lower lines is generally adopted to improve the power supply capacity of the traction network. Because of the trans-impedance existing between the uplink and the downlink, the traction network with the complex line direct-supply wiring mode has larger reactance ranging error, and the fault ranging is generally carried out by adopting an uplink and downlink current ratio method capable of eliminating the influence of the trans-impedance. The calculation formula of the up-down current ratio principle is as follows:
Wherein L is the fault distance, L is the total length of the power supply arm, I 1 is the effective value of the downlink current of the feeder, I 2 is the effective value of the uplink current of the feeder, and Deltal is the ranging correction parameter.
Meanwhile, considering the power supply reliability, a 50% standby mode is generally adopted, 3 circuit breakers are arranged on an uplink and a downlink, two main circuits are used, one standby circuit is used, and a traction network and an analog quantity wiring schematic diagram in the 50% standby mode are shown in fig. 1. If the three-interval current is mutually connected into the opposite-side interval device by adopting the cable, the problems of complex current loop, electromagnetic compatibility and the like caused by large cable consumption and excessive number of secondary windings of the current are also existed besides the difficulty of engineering implementation. On the premise of not re-planning the design of a secondary circuit of the transformer substation and increasing hardware, GOOSE analog quantity information is transmitted between station control layers, electric connection between devices is reduced, and a physical circuit is replaced by distributed sampling.
The opposite side current access mode of the cable is reliable, the sampling of two paths of currents is synchronous, and during normal operation, the currents at QF1 and QF2 are mutually accessed to the opposite side feeder protection device by adopting the cable, so that the reliable and synchronous sampling under the normal operation working condition is ensured. The invention provides a distance measurement synchronization scheme for solving the problem of fault distance measurement under the distributed sampling working condition based on a 50% standby mode, namely when a downlink QF1 or an uplink QF2 is overhauled or stopped, a standby breaker QF3 and a standby separated BQS1 are put into or a standby breaker QF3 and a standby separated BQS2 are put into to serve as uplink and downlink standby power supply, and a network architecture of exchanging analog quantity and switching information in a GOOSE mode is adopted.
The following describes the technical scheme of the present invention in detail with reference to the accompanying drawings. According to one embodiment of the invention, a feeder line fault location method under a double-line direct supply 50% standby mode is provided, which comprises the following steps:
And when the GS link is normal, performing fault location by adopting the GOOSE uplink and downlink current ratio.
It is determined whether the fault satisfies a steady state characteristic.
And if the steady-state characteristics are met, ranging according to the steady-state characteristics.
If the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic.
And if the GS link is abnormal or the steady state characteristic is not met and the fault change quantity characteristic is not met, adopting a reactance ranging method to perform fault ranging.
When a line fails in a 50% standby power supply mode, the positions of short-circuit points are different, and the uplink and downlink feeder line protection devices can be simultaneously protected and started, and one side is started and the other side is not started.
When the uplink and downlink current ratio method is used for ranging, the effective value of the protection current at the side and the effective value of the protection current at the opposite side are used. Taking the ranging of the feeder device 3 as an example, under the condition that a downlink QF1, a standby breaker QF3 and a standby isolating BQS2 are put into a 50% standby power supply mode, the opposite side current used for ranging of the feeder device 3 is the effective value of a downlink fault current I1 transmitted by a GOOSE; in the case of the uplink QF2 and the standby breaker QF3 and the standby bay BQS1 being put into operation, the opposite side current used for ranging by the feeder device 3 is the effective value of the uplink fault current I2 transmitted by GOOSE. In the case of line fault, the waveform of the fault current after entering the steady state is shown in fig. 2, and in the embodiment of the invention, according to the "steady state feature during fault: the fault current at two sides is simultaneously larger than the protection starting current fixed value; fault variable characteristics: the bus voltage becomes small during the fault, the line current suddenly changes to position the opposite side current during the fault in two synchronous modes, the current on the side and the current on the opposite side during the fault are reliably locked, and the problem of the distance measurement data synchronization of distributed sampling is solved.
The following describes both modes in detail.
(1) Fault steady state feature ranging synchronization
The schematic diagram based on fault steady-state characteristic ranging synchronization is shown in fig. 3, when a line breaks down in a 50% standby power supply mode, the effective value of fault current is buffered, current data on two sides of the line within a certain time after the fault is recorded, the uplink feeder line protection device and the downlink feeder line protection device sense fault characteristics simultaneously, protection starting conditions are met, after a ranging starting delay t0 avoids transient fault current, the current begins to enter ranging logic, after a ranging synchronization delay t1, the effective value of local fault current buffered by two side devices at the moment is updated, information is mutually transmitted to opposite sides through a GS link, and ranging calculation is completed respectively.
(2) Fault-variance-based feature ranging synchronization
The schematic diagram based on fault variable characteristic ranging synchronization is shown in fig. 4, according to the condition that when a line fails in a 50% standby power supply mode, one side of an uplink feeder line protection device and one side of a downlink feeder line protection device are started, and the fault characteristics of steady-state quantity at the non-starting side are not obvious, and the fault identification is completed by means of the variable characteristics: when the bus voltage is sensed to be reduced or the current is suddenly increased by the two side devices, the device abrupt variable is started, the effective value of the fault current is buffered, the current data of the two sides of the line in a certain time after the fault is recorded, the current data of the two sides of the line is started to enter a ranging logic after the transient fault current is avoided through a ranging starting delay t 0, the effective value { I 1,I2,......,IM } of the fault current of the two side devices before the fault is removed after the moment and the effective value { I DC1,IDC2,......,IDCM } of the opposite side fault current are continuously buffered through a ranging synchronous delay t 1, M pieces of opposite side information which are continuously updated are transmitted to the fault side through a GS link, the uplink and downlink current ratio { Q 1,Q2,......,QM } is calculated on the fault side, and the uplink and downlink current ratio calculation formula is as follows:
And calculating current ratio difference values { Q 1,Q2,......,QM } of the uplink and downlink currents of M points according to a time sequence, and if N current ratio difference values meet { |Q K-QK-1|,......,|QJ-QJ-1 | } < epsilon (epsilon is an allowable error range) continuously, selecting the current on the side with the smallest error value and the current on the opposite side { I i,IDCi } as fault distance measurement current to finish the distance measurement of the current ratio of the uplink and the downlink. The method comprises the steps that M generally selects data after one cycle after a fault, so that data as little as possible are transmitted to obtain synchronous data, proper M and N can be selected according to experience values, taking 32-point sampling of each cycle as an example, taking 16 points as M and 9 as N; the choice of N suggests M greater than 0.5 times to confirm that the waveform is stable.
According to a second embodiment of the present invention, a feeder line fault location method based on GOOSE communication is provided, and a flowchart of the method is shown in fig. 5, where the feeder line fault location method in a 50% standby mode for supplying complex lines according to the first embodiment of the present invention includes the following steps:
Identifying the operation mode of the feeder line; if the method is a double-line direct supply 50% standby mode, the method according to the first embodiment of the invention is adopted for fault location; if the current is in other modes, the distance measurement is carried out by adopting an uplink-downlink current ratio distance measurement method, and the distance measurement currents at two sides are locked.
According to a third embodiment of the invention, a feeder line fault location device in a 50% standby mode is provided, which comprises a reactance ranging method ranging module, a steady-state characteristic ranging module and a fault variation characteristic ranging module; wherein,
The reactance ranging method ranging module is used for performing fault ranging by adopting a reactance ranging method when the GS link is abnormal or if the GS link does not meet the steady-state characteristic and the fault variation characteristic is not met;
the steady-state characteristic distance measurement module is used for carrying out fault distance measurement by adopting steady-state characteristics when the steady-state characteristics are met;
The fault variable quantity characteristic distance measurement module is used for carrying out fault distance measurement according to the fault variable quantity characteristic when the steady state characteristic is not met but the fault variable quantity characteristic is met.
The specific scheme of the implementation function of each module in this embodiment of the present invention is the same as the method described in the first embodiment of the present invention, and will not be described herein.
In summary, the present invention relates to a method and a device for ranging feeder line faults in a 50% standby mode by using a complex line, wherein the method comprises the following steps: when the GS link is normal, performing fault location by adopting a GOOSE uplink-downlink current ratio; judging whether the fault meets the steady-state characteristic or not; if the steady-state characteristics are met, ranging according to the steady-state characteristics; if the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic. According to the technical scheme provided by the invention, on the premise of not re-planning the design of the secondary circuit of the transformer substation and increasing hardware, GOOSE analog quantity information is transmitted between the station control layers, the electrical connection between devices is reduced, a physical circuit is replaced by distributed sampling, the current on the side and the current on the opposite side are ensured to be reliably locked when faults occur, and the problem of the distance measurement data synchronization of the distributed sampling is solved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (7)
1. A feeder line fault location method under a double-line direct supply 50% standby mode is characterized by comprising the following steps:
When GOOSE is normal, performing fault location by adopting an uplink-downlink current ratio;
judging whether the fault meets the steady-state characteristic or not;
if the stable state characteristics are met, fault distance measurement is carried out according to the stable state characteristics;
if the steady-state characteristic is not met but the fault variable quantity characteristic is met, fault distance measurement is carried out according to the fault variable quantity characteristic;
The fault location includes:
Based on fault steady-state feature ranging synchronization, when a line breaks down, starting to buffer effective values of fault currents, recording current data on two sides of the line within a certain time after the fault, enabling an uplink feeder line protection device and a downlink feeder line protection device to simultaneously sense fault features, meeting protection starting conditions, starting to enter ranging logic after the transient fault currents are avoided through ranging starting delay, updating the effective values of the local fault currents buffered by the two side devices at the moment through ranging synchronous delay, mutually transmitting information to opposite sides through GOOSE, and respectively completing ranging calculation;
Based on fault variable quantity characteristic ranging synchronization, when a line is in fault, one side of an uplink feeder line protection device and one side of a downlink feeder line protection device are started, and the fault characteristic of steady-state quantity at the side of the non-start is not obvious, and fault identification is completed by means of the variable quantity characteristic: when the bus voltage is sensed to be small or the current is suddenly increased by the two side devices, the device abrupt variable is started, the effective value of fault current is buffered, current data on two sides of a line in a certain time after the fault is recorded, the transient fault current is avoided after the distance measurement starting delay, the current data starts to enter a distance measurement logic, the effective value of the fault current on the side of the two side devices before the fault is removed at the moment and the effective value of the fault current on the opposite side are continuously buffered after the distance measurement synchronous delay, and M pieces of continuously updated opposite side information are transmitted to the fault side through GOOSE, and the uplink and downlink current ratio is calculated on the fault side.
2. The method of claim 1, wherein if the GOOSE is abnormal or if steady state characteristics are not met and fault variance characteristics are not met, performing fault location using reactive ranging.
3. The method of claim 2, wherein the satisfying steady state characteristics comprises: the fault current at two sides is larger than the protection starting current fixed value at the same time.
4. The method of claim 1, wherein said performing fault location based on the fault delta characteristic comprises:
buffering effective values of ranging currents at two sides of a feeder line, and mutually transmitting the effective values of the currents of M continuous points through GOOSE;
calculating the uplink and downlink current ratio and the current ratio difference according to a time sequence;
judging whether the difference value of the continuous N current ratios is smaller than an allowable error threshold value or not; if yes, selecting the current on the side with the smallest current ratio difference value and the current on the opposite side to perform fault location; if not, returning to the first step.
5. The method of claim 4, wherein the upstream-to-downstream current ratio is calculated according to the following formula:
Wherein, For/>Up-down current ratio of each point,/>For/>Local side fault current effective value of each point,/>For/>The opposite side fault current effective value of each point.
6. The method of claim 5, wherein the current ratio difference is calculated time-sequentially according to the formula:
Wherein, Is the current ratio difference.
7. A feeder line fault location device in a 50% standby mode of compound line direct supply, which is characterized by ranging based on the feeder line fault location method in the 50% standby mode of compound line direct supply according to any one of claims 1-6, and comprising a reactance ranging method ranging module, a steady-state characteristic ranging module and a fault change quantity characteristic ranging module; wherein,
The reactance ranging method ranging module is used for performing fault ranging by adopting a reactance ranging method when the GOOSE is abnormal or if the steady-state characteristic is not met and the fault variation characteristic is not met;
the steady-state characteristic distance measurement module is used for carrying out fault distance measurement by adopting steady-state characteristics when the steady-state characteristics are met;
The fault variable quantity characteristic distance measurement module is used for carrying out fault distance measurement according to the fault variable quantity characteristic when the steady state characteristic is not met but the fault variable quantity characteristic is met.
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| CN113466623A (en) * | 2021-06-29 | 2021-10-01 | 华中科技大学 | Traction network fault location method, system and medium based on transient sudden change current |
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| JP3769544B2 (en) * | 2003-01-31 | 2006-04-26 | 富士通株式会社 | Transmission band control device |
| US8305903B1 (en) * | 2008-03-31 | 2012-11-06 | C Speed, Llc | Data acquisition system for test and measurement signals |
| JP5393117B2 (en) * | 2008-12-01 | 2014-01-22 | 三菱電機株式会社 | Transmission line accident location device and transmission line accident location method |
| KR101172754B1 (en) * | 2010-12-07 | 2012-08-14 | 김영섭 | Selective Protecting System for Parallel Power Supply System of AT system of Electric Railway |
| CN102157983B (en) * | 2011-04-01 | 2014-04-23 | 南京南瑞继保电气有限公司 | GOOSE (generic object oriented substation event)-based five-prevention locking method of measuring and controlling device |
| CN202121386U (en) * | 2011-07-21 | 2012-01-18 | 成都磁海电气工程有限公司 | Intelligent railway power transformation system |
| CN107315131B (en) * | 2017-07-05 | 2019-11-19 | 成都交大许继电气有限责任公司 | AT power supply trouble ranging data acquisition method based on IEC61850 and fault waveform |
| AU2018100665A4 (en) * | 2018-05-17 | 2018-06-14 | Macau University Of Science And Technology | Methods and Systems for Fault Diagnosis in a Discrete Event System |
| CN109245059B (en) * | 2018-08-31 | 2020-01-10 | 南京南瑞继保电气有限公司 | Micro-grid feeder protection method and device |
| CN110707667B (en) * | 2019-09-10 | 2022-02-18 | 许继电气股份有限公司 | Direct-current line protection method and device for direct-current power distribution network |
| CN111796164B (en) * | 2020-07-16 | 2021-04-13 | 西南交通大学 | Fault location method for full-parallel AT traction network |
| CN112051484A (en) * | 2020-09-02 | 2020-12-08 | 天津大学 | Low-voltage direct-current system single-end fault location method based on voltage balancer |
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