CN106918758B - Low-current grounding comprehensive line selection method based on electrical quantity and non-electrical quantity - Google Patents
Low-current grounding comprehensive line selection method based on electrical quantity and non-electrical quantity Download PDFInfo
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Abstract
The invention discloses a small current grounding comprehensive line selection method based on electric quantity and non-electric quantity, when starting bus voltage abnormity warning, acquiring zero sequence current of a voltage abnormity bus associated line, judging whether the zero sequence current of a certain line is maximum and is the sum of zero sequence currents of other lines, and if yes, determining that the line is a grounding fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault. The method can accurately identify the grounding fault line at the dispatching master station end, can realize rapid and efficient closed-loop processing through remote control operation, improves the accuracy of low-current grounding switching, shortens the fault processing time, reduces the workload of regulating and controlling personnel, and effectively ensures the power supply reliability of a power grid.
Description
Technical Field
The invention relates to a small current grounding comprehensive line selection method based on electric quantity and non-electric quantity, and belongs to the field of electric power system dispatching automation.
Background
The power system can be divided into a large-current grounding system (including direct grounding, reactance grounding and low-resistance grounding) and a small-current grounding system (including high-resistance grounding, arc suppression coil grounding and ungrounded) according to a grounding processing mode. The 3-66 kV power system in China mostly adopts an operation mode that a neutral point is not grounded or is grounded through an arc suppression coil, namely, the low-current grounding system. In a low-current grounding system, single-phase grounding is a common temporary fault, and currently, single-phase grounding frequently occurs in a regional power grid, particularly a 10kV distribution line.
After single-phase grounding occurs, the voltage of the fault phase to the ground is reduced, the voltage of the non-fault phase to the ground is increased, but the voltage of the line is still symmetrical, so that continuous power supply to users is not affected, the system can run for 1-2 h, and the maximum advantage of the low-current grounding system is achieved. However, if the power grid runs for a long time when a single-phase earth fault occurs, the non-fault two phases rise relative to the ground voltage, which may cause the breakdown of the weak link of the insulation, and develop into an interphase short circuit, so that the accident is expanded, and the normal power utilization of the user is affected. It may also severely saturate the core of the voltage transformer, causing the voltage transformer to be burned out with severe overload. Meanwhile, arc grounding can also cause overvoltage of the whole system, so that equipment is damaged, and safe operation of the system is damaged. Therefore, when a single-phase earth fault occurs, the fault line must be found in time to be cut off.
Aiming at the problem of single-phase earth fault line selection, the traditional processing method mainly comprises two methods. One is to install a low-current grounding line selection device in a transformer substation, but the single-phase grounding fault conditions of a power grid are complex and various, and a low-current grounding line selection system only uses the fault characteristics of a certain aspect, so that the accuracy is not high, and the application intention of operation and maintenance personnel is not strong, so that the signals of most of the station-end low-current grounding line selection systems are unreliable, and even the operation is quitted. The other mode is a manual line selection mode, namely, the grounding line is manually screened and judged through alarm information received by a dispatching master station system, and then an operator is informed of on-site investigation and treatment.
With the continuous improvement of the dispatching automation level, the information acquisition capacity and the comprehensive analysis capacity of the main station are more and more comprehensive, meanwhile, the regulation and control integration technology is gradually popularized and is comprehensively applied to a regional power grid dispatching control system, the traditional remote control operation mode cannot meet the technical development requirement, and the regulation and control personnel normally pull open a fault line by adopting remote control at the main station side. Therefore, a new low-current grounding line selection method is needed to be adopted in a regional power grid dispatching master station, the line rapid identification and remote control of single-phase grounding faults are realized, the accuracy of low-current grounding brake pulling is improved, the fault processing time is shortened, the workload of regulating and controlling personnel is reduced, and the regulation and control operation is promoted to be changed from experience type to intelligent type.
Disclosure of Invention
In order to solve the technical problem, the invention provides a low-current grounding comprehensive line selection method based on an electrical quantity and a non-electrical quantity.
In order to achieve the purpose, the invention adopts the technical scheme that:
a small current grounding comprehensive line selection method based on electric quantity and non-electric quantity is characterized in that when a starting bus voltage abnormity alarm is given, zero sequence current of a voltage abnormal bus associated line is obtained, whether the maximum zero sequence current of a certain line is the sum of zero sequence currents of other lines is judged, and if yes, the line is in a grounding fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault.
The specific process of the low-current grounding comprehensive line selection method is as follows:
obtaining bus model information;
circulating all buses to obtain three-phase voltage and zero-sequence voltage of each bus;
if the three-phase voltage deviates from the reference value and the zero-sequence voltage exceeds a threshold value, starting a bus voltage abnormity alarm;
searching a voltage abnormal bus associated line, acquiring zero sequence current of each line, judging whether the maximum zero sequence current of a certain line is the sum of the zero sequence currents of other lines, and if so, judging that the line is in a ground fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault.
The deviation of the three-phase voltage from the reference value follows the principle that one phase of voltage is increased and the other two phases of voltage are lowered.
And searching for the voltage abnormal bus associated line by adopting a topology searching method.
The failure probability calculation formula of each line is as follows,
wherein n is the number of types of non-electrical information, lambdaiIs the weight of the ith non-information content information, piThe status value of the ith non-information content information is shown, and max.f is the fault probability of the line.
The non-electrical quantity information includes weather information, geographical information, construction information, and historical fault information.
And (4) sequencing the fault probabilities from large to small, sequentially cutting off the corresponding lines according to the sequencing of the fault probabilities, and if the bus voltage returns to be normal, judging the line to be a ground fault.
The line is cut off using remote control.
The invention achieves the following beneficial effects: the method realizes the comprehensive line selection based on the electric quantity and the non-electric quantity, wherein the electric quantity can effectively solve the fault line selection with obvious fault characteristic quantity, the non-electric quantity effectively solves the fault line selection when the fault characteristic quantity is not obvious, and simultaneously, the analysis results of the electric quantity and the non-electric quantity are comprehensively utilized to realize the accurate judgment of the fault line selection.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a general block diagram of a low current ground line selection employing the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, when a starting bus voltage abnormality alarm occurs, zero sequence current of a line associated with a voltage abnormal bus is obtained, whether the zero sequence current of a certain line is the maximum and is the sum of zero sequence currents of other lines is judged, and if yes, the line is in a ground fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault.
The method comprises the following specific steps:
step 1, bus model information is obtained based on a dispatching automation system.
And 2, circulating all the buses to obtain the three-phase voltage and the zero-sequence voltage of each bus.
And 3, judging whether the three-phase voltage deviates from the reference value, if not, circulating the next bus, if so, judging whether the zero-sequence voltage exceeds a threshold value, if not, circulating the next bus, and if so, starting the bus voltage abnormity alarm. The phase voltage deviation reference value follows the principle that one phase voltage is increased and the other phase voltage is lowered.
Step 4, searching a voltage abnormal bus associated line by adopting a topology searching method, obtaining zero sequence current of each line, judging whether the maximum zero sequence current of a certain line is the sum of the zero sequence currents of other lines, and if so, judging that the line is in a ground fault; if not, go to step 5.
And 5, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequencing the fault probabilities from large to small, sequentially cutting off the corresponding lines by adopting remote control operation according to the sequencing of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault.
The non-electrical quantity line selection adopts a probability method to position a grounding line, weights and state values of different types of non-electrical quantity information are set, and the fault probability of each line is calculated, wherein the specific calculation formula is as follows:
wherein n is the number of types of non-electrical information, lambdaiIs the weight of the ith non-information content information, piThe status value of the ith non-information content information is shown, and max.f is the fault probability of the line.
Common non-electrical quantity information includes meteorological information, geographical information, construction information, and historical fault information.
The meteorological information is considered by the following factors: sunny, cloudy, rainy, stormy, thunderstorm, strong wind, snow, haze and no weather information;
pi(x) The state value when the factor is x, namely the state value of sunny and cloudy weather is 1, the state value of rain and haze weather is 2, the state value of storm, thunderstorm, strong wind and snow weather is 3, and the state value of no weather information is 0.
The geographic information is considered by the following factors: multi-plant zones, multi-construction road sections, hillside zones, scenic spots and other multi-person zones, other special geographic environments and no environmental information;
namely, the multi-plant zone state value is 1, the multi-person zone state values such as hillside zones and scenic spots are 2, the multi-construction road section and other special geographic environment state values are 3, and the no-environment information state value is 0.
The factors to be considered for the construction information are: equipment failure, equipment obsolescence, potential safety hazards, other special conditions and no equipment information;
namely, the status value of the old equipment and the potential safety hazard is 1, the status value of the fault equipment is 2, the status value of other special conditions is 3, and the status value of the no-equipment status information is 0.
The factors to be considered for the historical fault information are: the number of occurrences;
that is, when the number of occurrences of the failure history is greater than 3, the state value is 4, and when the number of occurrences of the failure history is less than or equal to 3, the state value is the number of occurrences.
Of course, other non-electrical quantity information may be added, which needs to be determined according to actual situations, such as: artificial misoperation, the state value can be defined as 2, seasonal repetition is carried out, and the state value can be defined as 3; natural factors, the state value may be defined as 1.
To further illustrate the above process, the following examples are given:
(1) electric quantity line selection
Taking the east-standby seven-wire ground fault of the east-wind substation of the power grid in a certain area as an example, the process of judging the line ground fault by the system is as follows:
s11: obtaining 10kV I bus voltage measurement data of the Dongfeng station in real time: 9.88kV of A phase voltage, 0.74kV of B phase voltage and 10.27kV of C phase voltage, and meanwhile, when the zero sequence voltage 0.67kV exceeds a threshold value, starting a starting bus voltage abnormity alarm to prompt the B phase to be grounded.
S12: and automatically searching for associated lines of the Dongfeng station 10kV I bus, including a Dongbangqiline, a Dongbei line, a Dongben line, a Dongting pavilion line, a Dongbai line and a Dongbai line.
S13: obtaining the zero sequence current values of the Dongbangqin line, the Dongben line, the Dongting line, the Dongpo line and the Dongban line as follows: 11A, 4A, 2.5A, 1.75A, 0.25A.
S14: and judging the Dongbang seven lines as the grounding fault by using a zero-sequence current amplitude comparison method.
(2) Non-electric quantity line selection
Taking eastern line ground fault of a certain area power grid east wind transformer substation as an example, the process of judging the line ground fault by the system is as follows:
s21: obtaining 10kV II mother voltage measurement data of the Dongfeng station in real time: the voltage of the phase A is 10.88kV, the voltage of the phase B is 10.27kV, the voltage of the phase C is 1.03kV, and meanwhile, the zero sequence voltage of 0.54kV exceeds a threshold value, a bus grounding fault alarm is started, and the phase C is prompted to be grounded.
S22: and automatically searching for associated lines of the Dongfeng station 10kV II bus, including Dongxi lines, Dongfi lines, Donggui lines, Donguo lines, Donghui lines and Dongyi lines.
S23: obtaining the zero sequence current values of the Dongxi line, the Dong field line, the Donggui line, the Donguo line, the Donghui line and the Dongyi line as follows: 2.5A, 2A, 2.5A, 1.75A, 0.25A.
S24: the fault line cannot be judged by using a zero-sequence current amplitude comparison method.
S25: adopting a non-electrical quantity line selection method, wherein the non-electrical quantity information state values of the line are as shown in the following table:
the non-electrical quantity information weight is set as follows:
historical failure: 0.3, weather information: 0.2, geographic information: 0.2, construction information: 0.2, others: 0.1.
the line fault probability calculation result is:
dongxi line: 0 × 0.3+1 × 0.2+1 × 0.2+0 × 0.2+0 × 0.2 ═ 0.4;
east-line: 2 × 0.3+1 × 0.2+3 × 0.2+0 × 0.2+0 × 0.2 ═ 1.4;
east China line: 1 × 0.3+1 × 0.2+1 × 0.2+0 × 0.2+0 × 0.2 ═ 0.7;
donghui line: 0 × 0.3+1 × 0.2+1 × 0.2+0 × 0.2+0 × 0.2 ═ 0.4;
east liquid line: 0 × 0.3+1 × 0.2+1 × 0.2+0 × 0.2+0 × 0.2 is 0.4.
The east field line is therefore the line with the highest probability of ground fault.
S26: the east field line is cut off through remote control operation, 10kV I bus voltage measuring value is obtained after the shutdown, 5.88kV of A phase voltage, 5.98kV of B phase voltage and 6.03kV of C phase voltage, and zero sequence voltage 0kV is simultaneously recovered to the bus voltage and is normal, namely the east field line is determined to be a ground fault.
As shown in fig. 2, the low-current grounding line selection system adopting the method fully utilizes telemetering remote signaling information acquired by a dispatching automation platform at a dispatching master station end aiming at a single-phase grounding fault of a power distribution outgoing line, automatically monitors a low-current grounding bus according to the line voltage change condition, starts alarming and analyzing an abnormal bus in real time, judges a grounding line by comprehensively utilizing a line selection decision of electric quantity and non-electric quantity, and automatically cuts off a fault line through remote control.
The method realizes the comprehensive line selection based on the electric quantity and the non-electric quantity, wherein the electric quantity can effectively solve the fault line selection with obvious fault characteristic quantity, the non-electric quantity effectively solves the fault line selection when the fault characteristic quantity is not obvious, and meanwhile, the analysis results of the electric quantity and the non-electric quantity are comprehensively utilized to realize the accurate judgment of the fault line selection.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A low-current grounding comprehensive line selection method based on electrical quantity and non-electrical quantity is characterized in that: when starting bus voltage abnormity warning exists, acquiring zero sequence current of a voltage abnormal bus associated line, judging whether the maximum zero sequence current of a certain line is the sum of the zero sequence currents of other lines, and if so, determining that the line is in a ground fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault;
the specific process of the low-current grounding comprehensive line selection method is as follows:
obtaining bus model information;
circulating all buses to obtain three-phase voltage and zero-sequence voltage of each bus;
if the three-phase voltage deviates from the reference value and the zero-sequence voltage exceeds a threshold value, starting a bus voltage abnormity alarm;
searching a voltage abnormal bus associated line, acquiring zero sequence current of each line, judging whether the maximum zero sequence current of a certain line is the sum of the zero sequence currents of other lines, and if so, judging that the line is in a ground fault; if the voltage of the bus is not normal, acquiring non-electrical quantity information of the voltage abnormal bus associated line, calculating the fault probability of each line by adopting a weight method, sequentially cutting off the corresponding lines according to the sequence of the fault probabilities, and if the bus voltage returns to normal, judging that the line is a ground fault;
the deviation of the three-phase voltage from the reference value follows the principle that one phase of voltage is increased and the other two phases of voltage are lowered.
2. The method of claim 1, wherein the method comprises the following steps: and searching for the voltage abnormal bus associated line by adopting a topology searching method.
3. The method of claim 1, wherein the method comprises the following steps: the failure probability calculation formula of each line is as follows,
wherein n is the number of types of non-electrical information, lambdaiIs the weight of the ith non-information content information, piThe status value of the ith non-information content information is shown, and max.f is the fault probability of the line.
4. The method of claim 3, wherein the method comprises the following steps: the non-electrical quantity information includes weather information, geographical information, construction information, and historical fault information.
5. The method of claim 1, wherein the method comprises the following steps: and (4) sequencing the fault probabilities from large to small, sequentially cutting off the corresponding lines according to the sequencing of the fault probabilities, and if the bus voltage returns to be normal, judging the line to be a ground fault.
6. The method of claim 5, wherein the method comprises the following steps: the line is cut off using remote control.
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| CN108008248A (en) * | 2017-11-27 | 2018-05-08 | 国网安徽省电力公司黄山供电公司 | A kind of busbar small current neutral grounding warning system and method based on SCADA |
| CN110488154B (en) * | 2019-08-28 | 2021-06-22 | 国网四川省电力公司成都供电公司 | Low-current grounding line selection method for dispatching master station end |
| CN110716154A (en) * | 2019-10-23 | 2020-01-21 | 国网四川省电力公司南充供电公司 | Intelligent small-current grounding fault removing system |
| CN113640621B (en) * | 2021-08-27 | 2023-09-15 | 国网四川省电力公司成都供电公司 | Full-automatic detection method and detection system for low-current ground fault line |
| CN113922326B (en) * | 2021-10-15 | 2022-09-09 | 贵州电网有限责任公司 | Bus/line grounding line selection wheel cutting method based on SCADA data |
| CN117849536B (en) * | 2024-03-07 | 2024-06-11 | 江苏中恩网络科技有限公司 | Power grid distribution line fault on-line monitoring method and system |
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