CN111614066B - Automatic setting method and system for relay protection setting value of power distribution network - Google Patents
Automatic setting method and system for relay protection setting value of power distribution network Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
The invention discloses a method and a system for automatically setting a relay protection setting value of a power distribution network. By adopting the method and the system for automatically setting the relay protection setting value of the power distribution network, the conventional normalized setting value is quantitatively set and converted into dynamic adjustment along with the actual operation condition, and meanwhile, the characteristics of the wave recording file are extracted and predicted, so that the setting of the power distribution network setting value is more accurate, the problems of setting and control of the protection setting value of explosive distributed energy access are effectively solved, and the operation reliability of the power distribution network is guaranteed.
Description
Technical Field
The invention relates to a method and a system for automatically setting a relay protection setting value of a power distribution network, and belongs to the technical field of power distribution network automation.
Background
With the rapid development of the power grid automation technology, the functions and the performances of the power grid automation system are continuously improved, and the automation degree of the power operation management work reaches a high level. Compared with the prior art, a large amount of information generated when the power distribution network fails is lack of uniform and effective analysis and utilization, and the automation level of the analysis and the fixed value setting of the power distribution network fault monitoring and protection action behaviors is relatively lagged. Meanwhile, after the distributed power supply and the like are connected into the power distribution network, the original structural characteristics of the power grid are changed, the distribution of short-circuit current of the power grid, the magnitude of load current and the matching between relay protection are affected, the sensitivity and selectivity of the relay protection are reduced, and if the configuration and the fixed value of the conventional protection and automatic device cannot adapt to the change, incorrect action of the relay protection device can be caused, and accidents are expanded or equipment is damaged.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for automatically setting a relay protection setting value of a power distribution network, so that the setting of the power distribution network setting value is more accurate, and the problems of setting and controlling the protection setting value of explosive distributed energy access are effectively solved. In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method for automatically setting a relay protection constant value of a power distribution network comprises the following steps:
step S1, acquiring a wave recording file of a feeder switch of the power distribution network, wherein the wave recording file comprises a current value, and the wave recording file comprises a normal wave recording file and a fault wave recording file;
step S2, establishing a distribution network constant value setting topology analysis model;
step S3, setting a topology analysis model through a fixed value;
step S4, collecting wave recording file data;
step S5, processing the wave recording file data;
step S6, setting a fixed value: the feeder switch protection configuration associated with the wave recording file is overcurrent I section protection and overcurrent II section protection;
step S7, directional element determination: and judging end feeder switch configuration direction elements according to the protection configuration of the overcurrent I section and the overcurrent II section according to the feeder switch fixed value of the power distribution network.
As a further specific implementation of the method, in step S2, the distribution network frame is abstracted into three hierarchical topology models with different levels and simplified degrees by the distribution network fixed value setting topology analysis model, and a process of constructing the three hierarchical topology models is as follows:
graph topology model
The topology of the power distribution network is described by adopting topological graph data based on a CIM model, power distribution equipment in the topology is displayed, and the simplified power distribution network topology model is a graph topology model;
the skeleton topology model divides equipment except buses in the power distribution network into three equipment classes of power station outgoing lines, main lines and branch lines according to the positions of the equipment in the topology on the basis of the graph topology model;
processing the three equipment types into a single whole, and forming a topology model on the basis of keeping the original topology connection relation, namely a skeleton topology model of the original topology;
and (3) continuously abstracting all the transformer substations into nodes on the basis of the skeleton topology model, abstracting the trunk line into single wire equipment, and neglecting branch lines, wherein the formed topology model is the power distribution network fixed value setting analysis model.
As a further specific implementation of the method, in step S3, the process of setting the topology analysis model by fixed value is that the recording file is associated and mapped with the feeder switch to form the recording file of each feeder switch, and a feeder recording fingerprint database is established; the constant value wave recording fingerprint database comprises a normal wave recording file and a fault wave recording file, and obtains load current flowing through the switch of the associated feeder line in the normal wave recording file and three-phase fault short-circuit current and two-phase fault short-circuit current flowing through the switch of the associated feeder line in the fault wave recording file.
As a further specific implementation of the method, in step S4, data acquisition is performed on the recording file in the feeder line recording fingerprint library, where the data acquisition process includes: firstly, judging the file type, if the file is a normal wave recording file, entering a load current acquisition module, acquiring the peak current before the wave recording at the moment of Japan, and taking the maximum value as Ifh; if the fault current is a recording file, the fault current enters a fault current acquisition module to be judgedRecording file fault type, if three-phase short-circuit current, collecting fault phase current at the beginning of a half cycle at fault time, and marking as Ik(3)If the current is two-phase short-circuit current, acquiring fault phase current at the initial half cycle time of the fault time, and marking as Ik(2)Other fault types do not collect data; the one-half cycle time is 30 ms.
As a further specific implementation of the method, the data in the load current acquisition module comprises daily load current, and the maximum value of the daily load current, the maximum value of the monthly load current, the maximum value of the seasonal load current and the maximum value of the annual load current are obtained through data comparison; the data in the fault current acquisition module comprises two types, namely three-phase short-circuit fault phase current and two-phase short-circuit fault phase current.
As a further specific implementation of the method, the process of specifically obtaining the current value from the wave recording file is as follows: the recording file is in a COMTRADE data format, and analog channel sampling data stored in the file are converted to obtain actual values of voltage or current; in the COMTRADE configuration file, conversion factors a and b of each channel are given, and the data in the data file is multiplied by the conversion factor a and then added with b to be the actual sampling value of the channel; all data are converted according to the above rules to obtain the actual value of the required electrical quantity.
As a further specific implementation of the method, in step S5, the processing procedure of the recording file data is as follows: three values are needed by feeder line setting calculation, namely a maximum load current, a three-phase short-circuit current in a system maximum operation mode and a two-phase short-circuit current in a system minimum operation mode;
determining data set, load current Ifh: maximum value of current of load in the same day Ifh1Load current maximum value I in the monthfh2Load current maximum value I of this quarterfh3Maximum value of load current I of this yearfh4And the calculated rated load current Ifh5As the initial pre-value of the load current prediction;
then t1Smoothed value S of time1＝(Ifh1+Ifh2+Ifh3+Ifh4+Ifh5)/5；
t1Actual value y of time1For the load current I at the present momentfh6；
t2Smoothed value S of time2＝ay1+(1-a)S1；
Wherein a is a balance constant, the value of a is 0.1-0.4 in consideration of the fluctuation of the load time sequence, and the value of a in this example is 0.3;
then S2Is taken as t2Predicted load current at time, and so on, S3＝ay2+(1-a)S2Obtaining the predicted load current after each interval of time, and applying the predicted load current to the overcurrent protection constant value calculation;
determining data set, three-phase short-circuit current Ik(3): three-phase short-circuit current value I at quarter3 k1Theoretically calculating three-phase short-circuit current I under maximum operation mode3 k2As the initial previous value of the three-phase short-circuit current value;
then t10Smoothed value S of time10＝(I3 k1+I3 k2)/2；
t10Actual value y of time10For three-phase short-circuit current I at the moment of current fault3 k3；
t20Smoothed value S of time20＝dy10+(1-d)S10；
D is a balance constant, a large value is selected for the value of d in consideration of large change of three-phase short-circuit current values caused by multiple operation modes, the value is selected from 0.6-0.8, and the value of d in the embodiment is 0.65;
then S20Is taken as t20Predicting three-phase short-circuit current at time, and so on, S30＝dy20+(1-d)S20Obtaining the predicted three-phase short-circuit current after each interval time, and applying the predicted three-phase short-circuit current to the calculation of the quick-break protection constant value;
determining data set, two-phase short-circuit current Ik(2): minimum two-phase short circuit current value I in quarter2 k1And theoretically calculating the three-phase short-circuit current I under the maximum operation mode2 k2As the initial pre-value of the load current prediction;
then t100Smoothed value S of time100＝(I2 k1+I2 k2)/2；
t100Actual value y of time100Two-phase short-circuit current I at the moment of current fault2 k3；
t200Smoothed value S of time200＝cy100+(1-c)S100；
Wherein c is a balance constant, and the value c is selected to be a larger value and is selected to be a value between 0.6 and 0.8 in consideration of larger change of the two-phase short-circuit current value caused by more operation modes, and the value c in the embodiment is 0.65;
then S200Is taken as t200Predicting two-phase short-circuit current at the moment, and so on, S300＝cy200+(1-c)S200And obtaining the predicted two-phase short-circuit current after each interval time, and applying the predicted two-phase short-circuit current to the calculation of the quick-break protection constant value.
As a further specific implementation of the method, in step S6, the overcurrent I-section protection is set according to the maximum short-circuit current of the three-phase short circuit at the tail end of the line, I1.set＝Krel*I3 kmax，
Wherein, I1.setFor protecting current values during overcurrent phase I3 kmaxMaximum short-circuit current, K, for avoiding three-phase short-circuit at the end of the linerelThe reliability coefficient of the line is taken as the reliability coefficient of the line; i is3 kmaxThree-phase short circuit smooth value in data processing and reliability coefficient KrelTaking 1.3-1.5; setting the overcurrent II section protection constant value according to the principle 1, carrying out sensitivity inspection, and setting the overcurrent II section protection constant value according to the principle 2 if the sensitivity does not meet the requirement;
principle 1 is to avoid the maximum load of the line, and principle 2 is that the tail end of the line has sensitivity to metallic faults;
the sensitivity test of the overcurrent II section comprises the following steps: end of line according to bookEnd-to-end metallic failure with sensitivity check, Ksen＝I2 kmax/I2.set＞1.3，
I2 kmaxTwo-phase short-circuit smoothing value, I, in fetch processing2.setProtecting the current value for an overcurrent II section;
the overcurrent II section protection is defined as follows according to principle 1: i is2.set＝Krel*Ifh，
Wherein, I2.setFor protection of current values during overcurrent phase II, IfhIs the maximum load current of the feeder switch, KrelThe reliability coefficient of the circuit is taken as the reliability coefficient of the circuit; i isfhTaking load current smooth value in array and reliability coefficient KrelTaking 1.3-1.5;
the overcurrent II section protection is defined as follows according to principle 2: i is2.set＝I2 kmax/KrelReliability factor KrelTaking 1.3-1.5.
As a further specific implementation of the method, in step S6, the feeder switch constant value of the power distribution network is configured according to the protection of the overcurrent I section and the overcurrent II section, when the upper and lower feeder switches are determined in the constant value setting topology analysis model, when the three-phase short-circuit current associated with the upper feeder switch is smaller than the three-phase short-circuit current associated with the present feeder switch, the present feeder switch is configured with a directional element, and the direction is determined as a directional line, otherwise, the present feeder switch is not configured with a direction.
A system for automatically setting a relay protection setting value of a power distribution network is used for executing the method for automatically setting the relay protection setting value of the power distribution network, and comprises the following modules:
the wave recording extraction module is used for obtaining wave recording files related to the feeder switch, wherein the wave recording files comprise normal wave recording files and fault wave recording files;
the wave recording identification module is used for identifying the extracted wave recording, firstly identifying whether the file is a normal wave recording file or a fault wave recording file, and if the file is a fault wave recording file, identifying the fault type and extracting two-phase short circuit fault type and three-phase short circuit fault type wave recording files;
the fixed value setting topology analysis module is used for carrying out topology analysis on the selected power distribution network architecture and establishing a power distribution network topology model containing each feeder switch;
a wave recording correlation module: performing associated mapping on the identified wave recording files and feeder switches in the topology analysis module, wherein the identified wave recording files comprise a feeder wave recording fingerprint library, and normal wave recording files and fault wave recording files of each feeder switch;
the recording feature extraction module: carrying out array extraction and smooth value calculation on the load current, the three-phase short-circuit current and the two-phase short-circuit current according to the method to obtain setting calculation data required at a certain time;
a constant value calculation principle module: the module comprises a feeder switch setting calculation principle and a feeder switch setting calculation method, and comprises an overcurrent I section, an overcurrent II fixed value setting method and a sensitivity calibration method;
a constant value calculation module: according to a constant value calculation principle and a recording characteristic, extracting a smooth value to calculate constant values of an over-current I section and an over-current II section;
a direction judging module: and comparing the three-phase short-circuit current of the associated wave recording file of a certain feeder switch with the three-phase short-circuit current of the associated wave recording file of the previous feeder switch, and judging whether to adopt protection direction judgment or not.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
at present, the conventional power distribution network setting calculation method adopts theoretical calculation values, and influences of multiple factors such as distributed power supply access and the like are ignored. By adopting the method and the system for automatically setting the relay protection setting value of the power distribution network, the conventional normalized setting value is quantitatively set and converted into dynamic adjustment along with the actual operation condition, and meanwhile, the characteristics of the wave recording file are extracted and predicted, so that the setting of the power distribution network setting value is more accurate, the problems of setting and control of the protection setting value of explosive distributed energy access are effectively solved, and the operation reliability of the power distribution network is guaranteed.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of device classification in a skeletal topology model;
FIG. 2 is a schematic diagram of a layout topology model;
fig. 3 is a schematic diagram of a power distribution network relay protection fixed value automatic setting system;
FIG. 4 is a flow chart of a method for automatically tuning a protection setting value;
fig. 5 is a schematic diagram of a feed line recording fingerprint database architecture.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting.
Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The method for automatically setting the relay protection setting value of the power distribution network comprises the following steps:
step S1, acquiring a wave recording file of a feeder switch of the power distribution network, wherein the wave recording file comprises a current value, and the wave recording file comprises a normal wave recording file and a fault wave recording file;
step S2, a distribution network constant value setting topology analysis model is established, the topology analysis abstracts the distribution network frame into three layered topology models with different levels and simplified degrees, and the three layered topology model is constructed:
s21, graph topology model
And describing the topology of the power distribution network by adopting topological graph data based on a CIM model, displaying main equipment in the topology, and taking the simplified power distribution network topology model as a graph topology model.
S22 skeleton topology model
As shown in FIG. 1, on the basis of a graph topology model, all the devices (except for a bus) in the power distribution network are divided into three device classes (shown as A, B and C in FIG. 1 respectively) of a power station outgoing line, a main line and a branch line according to the positions of the devices in the topology.
The three types of equipment defined above are processed into a single whole, and a topological model formed on the basis of keeping the original topological connection relation is a skeleton topological model of the original topology. The layer model describes the topology of the distribution network on a relatively macroscopic level.
S23, layout topology model
As shown in fig. 2, on the basis of the skeleton topology model, all substations are continuously abstracted into nodes (represented by ■ in fig. 2), the trunk line is abstracted into a single wire device, and the branch line is ignored, so that the formed topology model is the distribution network fixed value setting analysis model.
Step S3, as shown in fig. 5, performing associated mapping on the wave recording file and the feeder switches by setting the topology analysis model to form a wave recording file for each feeder switch, and establishing a feeder wave recording fingerprint database; the constant value wave recording fingerprint database comprises a normal wave recording file and a fault wave recording file, and data concerned by the user are load current flowing through a switch of a related feeder line in the normal wave recording file and three-phase fault short-circuit current and two-phase fault short-circuit current flowing through the switch of the related feeder line in the fault wave recording file.
Step S4, collecting wave recording file data
And (4) carrying out data acquisition on the wave recording file in the feeder wave recording fingerprint database through the following process. Firstly, judging the file type, if the file is a normal wave recording file, entering a load current acquisition module, acquiring the peak current before the time of recording in Japan, taking the maximum value, and marking as Ifh(ii) a Optionally, because the amount of the acquired data is very large, the time interval can be selected to determine the acquisition frequency; if the fault type is a recording file, entering a fault current acquisition module to judge the fault type of the recording file, and if the fault type is a three-phase short-circuit current, acquiring a fault phase current of 30ms (one half cycle time) starting at the fault time, wherein the fault phase current is marked as Ik (3)If the two-phase short-circuit current is adopted, the fault phase current of the initial 30ms (one half cycle time) of the fault time is collected and marked as Ik (2)Other fault types do not collect data. According to the acquisition method, the data in the load current acquisition module comprise daily load current, and the daily load current maximum, the monthly load current maximum, the quarterly load current maximum and the annual load current maximum can be obtained through data comparison; the data in the fault current acquisition module comprises two types, namely three-phase short-circuit fault phase current and two-phase short-circuit fault phase current.
The process of specifically obtaining the current value from the wave recording file is as follows: the recording file is in a COMTRADE data format, analog channel sampling data stored in the file is not an actual value, and the actual value of voltage or current can be obtained only after certain conversion. In the COMTRADE configuration file, the conversion factors a and b for each channel are given, and the actual sampling value of the channel is obtained by multiplying the data in the data file by the conversion factor a and adding b. For example, if the conversion factor for a voltage is 0.073915 and-0.182614, respectively, and the sampled data at time 2124ms is 1059, then the actual value is 78.093371. Thus, all data is transformed according to the above rules to obtain the actual value of the required electrical quantity. Step S5, processing the recording file data:
three values are needed for feeder line setting calculation, namely maximum load current, three-phase short-circuit current in a system maximum operation mode and two-phase short-circuit current in a system minimum operation mode.
S51, determining data set, load current: maximum value of current of load in the same day Ifh1Load current maximum value I in the monthfh2Load current maximum value I of this quarterfh3Maximum value of load current I of this yearfh4And the calculated rated load current Ifh5As the initial previous value of the load current prediction.
Then t1Smoothed value S of time1＝(Ifh1+Ifh2+Ifh3+Ifh4+Ifh5)/5
t1Actual value y of time1For the load current I at the present momentfh6
t2Smoothed value S of time2＝ay1+(1-a)S1
Wherein a is an equilibrium constant. Considering that the load time sequence has fluctuation but the long-term trend changes little, the value of alpha is 0.1-0.4, and the value of a in the example is 0.3.
Then S2Is taken as t2Predicted load current at time, and so on, S3＝ay2+(1-a)S2，And obtaining the predicted load current after each interval time, and applying the predicted load current to the overcurrent protection constant value calculation.
Note that the rated load current I is caused by the variation of the grid structure or the loadfh4With changes, recalculating Ifh4The calculation can then be performed from the new start.
S52, determining data set, three-phase short-circuit current Ik(3): three-phase short-circuit current value I with maximum current in this quarter3 k1Theoretically calculating three-phase short-circuit current I under maximum operation mode3 k2As the initial previous value of the three-phase short-circuit current value.
Then t10Smoothed value S of time10＝(I3 k1+I3 k2)/2
t10Actual value y of time10For three-phase short-circuit current I at the moment of current fault3 k3
t20Smoothed value S of time20＝dy10+(1-d)S10
Wherein d is an equilibrium constant. Considering that the operation modes are changed more, the numerical value of the three-phase short-circuit current is changed greatly, the numerical value of d is preferably selected to be larger, and the numerical value is selected between 0.6 and 0.8, so that the sensitivity of the prediction model is higher, and the data change can be followed quickly. In this example, the value of d is 0.65.
Then S20Is taken as t20Predicting three-phase short-circuit current at time, and so on, S30＝dy20+(1-d)S20，And obtaining the predicted three-phase short-circuit current after each interval time, and applying the predicted three-phase short-circuit current to the calculation of the quick-break protection constant value.
Note that the three-phase short-circuit current I under the maximum operation mode is calculated theoretically due to the equivalent impedance change of the system3 k2With changes, recalculating I3 k2The calculation can then be performed from the new start.
S53, determining data set, two-phase short-circuit current Ik(2): minimum two-phase short circuit current value I in quarter2 k1Theoretically calculating three-phase short-circuit current I under maximum operation mode2 k2As the initial previous value of the load current prediction.
Then t100Smoothing of time of dayValue S100＝(I2 k1+I2 k2)/2
t100Actual value y of time100For two-phase short-circuit current I at the moment of current fault2 k3
t200Smoothed value S of time200＝cy100+(1-c)S100
Wherein c is an equilibrium constant. Considering that the operation mode changes greatly to cause the numerical value change of the two-phase short-circuit current, the value c is preferably selected to be larger and is selected between 0.6 and 0.8, so that the sensitivity of the prediction model is higher, and the data change can be followed quickly. The value of example c is 0.65.
Then S200Is taken as t200Predicting two-phase short-circuit current at time, and so on, S300＝cy200+(1-c)S200，And obtaining the predicted two-phase short-circuit current after each interval time, and applying the predicted two-phase short-circuit current to the calculation of the quick-break protection constant value.
Note that the theoretically calculated two-phase short-circuit current I in the minimum operation mode is caused by the equivalent impedance change of the system3 k2With changes, recalculating I3 k2The calculation can then be performed from the new start.
Note that the three groups have different determined time frequencies, the load current at the non-fault time can be used as a reference value, and a certain time interval can be determined for data acquisition and load current prediction; three-phase short-circuit current and two-phase short-circuit current have numerical values only when the faults occur, and the time frequency of the predicted current is uncertain.
Step S6, as shown in fig. 4, constant value setting: and the feeder switch protection associated with the wave recording file is configured as overcurrent I section protection and overcurrent II section protection.
The setting method comprises the following steps:
and the overcurrent I section protects the setting of the three-phase short circuit maximum short circuit current at the tail end of the line. I is1.set＝Krel*I3 kmax
I3 kmaxThree-phase short circuit smooth value in data processing and reliability coefficient KrelTaking 1.3-1.5.
Overcurrent II section protection avoids the maximum load setting of the circuit according to the principle 1.
I2.set＝Krel*Ifh
IfhAnd taking the load current smooth value in the array for the maximum load current of the feeder switch. Reliability factor KrelTake 1.3-1.5
And (3) checking the sensitivity of an overcurrent II section: the metallic fault at the end of the line is checked sensitively.
Ksen＝I2 kmax/I2.set＞1.3
If the sensitivity does not meet the requirement, the constant value of the overcurrent II section has sensitivity I when the end of the line has metallic fault according to principle 22.set＝I2 kmax/KrelSetting and reliability coefficient KrelTake 1.3-1.5
Step S7, directional element determination. And when the three-phase short-circuit current associated with the upper feeder switch is smaller than the three-phase short-circuit current associated with the feeder switch, the feeder switch is provided with a directional element, and the direction is determined to be a directional line, otherwise, the feeder switch does not have the direction.
As shown in fig. 3, an automatic setting system for relay protection constant value of a power distribution network includes the following modules:
and the wave recording extraction module is used for obtaining wave recording files related to the feeder switch, including normal wave recording files and fault wave recording files. And the wave recording identification module is used for identifying the extracted wave recording, firstly identifying whether the file is a normal wave recording file or a fault wave recording file, and if the file is a fault wave recording file, identifying the fault type and extracting two-phase short circuit fault type and three-phase short circuit fault type wave recording files.
And the fixed value setting topology analysis module is used for carrying out topology analysis on the selected power distribution network architecture and establishing a power distribution network topology model containing each feeder switch.
A wave recording correlation module: and performing associated mapping on the identified wave recording file and a feeder switch in the topology analysis module, wherein the associated mapping comprises a feeder wave recording fingerprint library, and a normal wave recording file and a fault wave recording file containing each feeder switch.
The recording feature extraction module: and carrying out array extraction and smooth value calculation on the load current, the three-phase short-circuit current and the two-phase short-circuit current according to the method to obtain setting calculation data required at a certain time.
A fixed value calculation principle module: the module comprises a feeder switch setting calculation principle and a feeder switch setting calculation method, and comprises an overcurrent I section, an overcurrent II fixed value setting method and a sensitivity calibration method.
A constant value calculation module: and (4) according to a constant value calculation principle and the recording characteristic, extracting a smooth value and calculating constant values of the overcurrent I section and the overcurrent II section.
A direction judging module: and comparing the three-phase short-circuit current of the associated wave recording file of a certain feeder switch with the three-phase short-circuit current of the associated wave recording file of the previous feeder switch, and judging whether to adopt protection direction judgment or not.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; it is obvious as a person skilled in the art to combine several technical solutions of the present invention. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for automatically setting a relay protection setting value of a power distribution network is characterized by comprising the following steps:
step S1, acquiring a wave recording file of a feeder switch of the power distribution network, wherein the wave recording file comprises a current value, and the wave recording file comprises a normal wave recording file and a fault wave recording file; step S2, establishing a distribution network constant value setting topology analysis model; step S3, the wave recording file and the feeder switch are mapped in a correlation mode through a fixed value setting topology analysis model to form the wave recording file of each feeder switch, and a feeder wave recording fingerprint database is established; the constant value wave recording fingerprint database comprises a normal wave recording file and a fault wave recording file, and obtains load current flowing through a switch of a related feeder line in the normal wave recording file and three-phase fault short-circuit current and two-phase fault short-circuit current flowing through the switch of the related feeder line in the fault wave recording file; step S4, collecting wave recording file data; step S5, processing the wave recording file data; step S6, setting a fixed value: the feeder switch protection configuration associated with the wave recording file is overcurrent I section protection and overcurrent II section protection; step S7, directional element determination: and judging end feeder switch configuration direction elements according to the overcurrent I section protection configuration and overcurrent II section protection configuration according to the feeder switch fixed value of the power distribution network.
2. The method according to claim 1, wherein in step S2, the distribution network fixed value setting topology analysis model abstracts the distribution network frame into three hierarchical topology models with different levels of simplification, and the three-level topology model is constructed:
graph topology model
The topology of the power distribution network is described by adopting topological graph data based on a CIM model, power distribution equipment in the topology is displayed, and the simplified power distribution network topology model is a graph topology model;
skeleton topology model
Dividing equipment except buses in a power distribution network into three equipment classes of power station outgoing lines, main lines and branch lines according to the positions of the equipment in the topology on the basis of a graph topology model;
processing the three equipment types into a single whole, and forming a topology model on the basis of keeping the original topology connection relation, namely a skeleton topology model of the original topology;
layout topology model
On the basis of the skeleton topology model, all the substations are continuously abstracted into nodes, the trunk line is abstracted into single wire equipment, the branch lines are ignored, and the formed topology model is the distribution network fixed value setting analysis model.
3. The method for automatically setting the relay protection setting value of the power distribution network according to claim 1, wherein in the step S4, data acquisition is performed on a wave recording file in a feeder wave recording fingerprint library, and the data acquisition process includes: firstly, judging the file type, if the file is a normal wave recording file, entering a load current acquisition module, acquiring the peak current before the time of recording in Japan, taking the maximum value, and marking as Ifh(ii) a If the recording file is abnormal, entering a fault current acquisition module to judge the fault type of the recording file, if the three-phase short-circuit current exists, acquiring the fault phase current at the starting half cycle moment of the fault moment, and marking the fault phase current as Ik(3)If the current is two-phase short-circuit current, acquiring fault phase current at the initial half cycle time of the fault time, and marking as Ik(2)Other fault types do not collect data;
the one-half cycle time is 30 ms.
4. The automatic setting method for the relay protection setting value of the power distribution network according to claim 3, wherein the data in the load current acquisition module comprises daily load current, and the daily load current maximum value, the monthly load current maximum value, the quarterly load current maximum value and the annual load current maximum value are obtained through data comparison; the data in the fault current acquisition module comprises two types, namely three-phase short-circuit fault phase current and two-phase short-circuit fault phase current.
5. The method for automatically setting the relay protection setting value of the power distribution network according to claim 4, wherein the process of specifically obtaining the current value from the wave recording file is as follows: the recording file is in a COMTRADE data format, and analog channel sampling data stored in the file are converted to obtain actual values of voltage or current; in the COMTRADE configuration file, conversion factors a and b of each channel are given, and the data in the data file is multiplied by the conversion factor a and then added with b to be the actual sampling value of the channel; all data are converted according to the above rules to obtain the actual value of the required electrical quantity.
6. The method for automatically setting the relay protection setting value of the power distribution network according to claim 1, wherein in the step S5, the processing process of the wave recording file data is as follows: three values are needed by feeder line setting calculation, namely a maximum load current, a three-phase short-circuit current in a system maximum operation mode and a two-phase short-circuit current in a system minimum operation mode;
determining data set, load current Ifh: maximum value of current of load in the same day Ifh1Load current maximum value I in the monthfh2Load current maximum value I of this quarterfh3Maximum value of load current I of this yearfh4And the calculated rated load current Ifh5As the initial pre-value of the load current prediction;
then t is1Smoothed value S of time1＝(Ifh1+Ifh2+Ifh3+Ifh4+Ifh5)/5；
t1Actual value y of time1For the load current I at the present momentfh6；
t2Smoothed value S of time2＝ay1+(1-a)S1；
Wherein a is a balance constant, the value of a is 0.1-0.4 in consideration of the fluctuation of the load time sequence, and the value of a in this example is 0.3;
then S2Is taken as t2Predicted load current at time, and so on, S3＝ay2+(1-a)S2Obtaining the predicted load current after each interval of time, and applying the predicted load current to the overcurrent protection constant value calculation;
determining data set, three-phase short-circuit current Ik(3): three-phase short-circuit current value I with maximum current in this quarter3 k1Theoretically calculating three-phase short-circuit current I under maximum operation mode3 k2As the initial previous value of the three-phase short-circuit current value;
then t10Smoothed value S of time10＝(I3 k1+I3 k2)/2；
t10Actual value y of time10For three-phase short-circuit current I at the moment of current fault3 k3；
t20Smoothed value S of time20＝dy10+(1-d)S10；
D is a balance constant, a large value is selected for the value of d in consideration of large change of three-phase short-circuit current values caused by multiple operation modes, the value is selected from 0.6-0.8, and the value of d in the embodiment is 0.65;
then S20Is taken as t20Predicting three-phase short-circuit current at time, and so on, S30＝dy20+(1-d)S20Obtaining the predicted three-phase short-circuit current after each interval time, and applying the predicted three-phase short-circuit current to the calculation of the quick-break protection constant value;
determining data set, two-phase short-circuit current Ik(2): minimum two-phase short circuit current value I in quarter2 k1And theoretically calculating two-phase short-circuit current I under the minimum operation mode2 k2As the initial pre-value of the load current prediction;
then t is100Smoothed value S of time100＝(I2 k1+I2 k2)/2；
t100Actual value y of time100For two-phase short-circuit current I at the moment of current fault2 k3；
t200Smoothed value S of time200＝cy100+(1-c)S100；
Wherein c is a balance constant, and the value c is selected to be a larger value and is selected to be a value between 0.6 and 0.8 in consideration of larger change of the two-phase short-circuit current value caused by more operation modes, and the value c in the embodiment is 0.65;
then S200Is taken as t200Predicting two-phase short-circuit current at time, and so on, S300＝cy200+(1-c)S200And obtaining the predicted two-phase short-circuit current after each interval time, and applying the predicted two-phase short-circuit current to the calculation of the quick-break protection constant value.
7. The method for automatically setting the relay protection setting value of the power distribution network according to claim 1, wherein in the step S6, the method for setting the setting value is as follows:
overcurrent I section protection is carried out according to maximum short circuit current setting of three-phase short circuit at tail end of local line1.set＝Krel*I3 kmax，
Wherein, I1.setFor protecting current values during overcurrent phase I3 kmaxMaximum short-circuit current, K, for avoiding three-phase short-circuit at the end of the linerelThe reliability coefficient of the circuit is taken as the reliability coefficient of the circuit; i is3 kmaxThree-phase short circuit smooth value in data processing and reliability coefficient KrelTaking 1.3-1.5;
setting the overcurrent II section protection constant value according to a principle 1, carrying out sensitivity inspection, and if the sensitivity does not meet the requirement, setting the overcurrent II section protection constant value according to a principle 2;
the principle 1 is to avoid the maximum load of the line, and the principle 2 is that the tail end of the line has sensitivity to metallic faults;
the sensitivity test of the overcurrent II section is as follows: sensitive verification of metallic faults at the ends of the line, Ksen＝I2 kmax/I2.set＞1.3，I2 kmaxTwo-phase short-circuit smoothing value, I, in fetch processing2.setProtecting the current value for an overcurrent II section;
the overcurrent II section protection is defined as follows according to principle 1: i is2.set＝Krel*Ifh，
Wherein, I2.setFor protection of current values during overcurrent phase II, IfhIs the maximum load current of the feeder switch, KrelThe reliability coefficient of the circuit is taken as the reliability coefficient of the circuit; i isfhTaking load current smooth value in array and reliability coefficient KrelTaking 1.3-1.5;
the overcurrent II section protection is defined as follows according to principle 2: i is2.set＝I2 kmax/KrelReliability factor KrelTaking 1.3-1.5.
8. The method according to claim 1, wherein in step S6, the power distribution network feeder switch setting value is configured according to protection of overcurrent I and overcurrent II, when the upper and lower feeder switches are determined in the setting topology analysis model, and when the three-phase short-circuit current associated with the upper feeder switch is smaller than the three-phase short-circuit current associated with the present feeder switch, the present feeder switch configures a directional element whose direction is determined to be a directional line, otherwise, it does not have a direction.
9. The system for automatically setting the relay protection setting value of the power distribution network according to claim 6, characterized by comprising the following modules:
the wave recording extraction module is used for obtaining wave recording files related to the feeder switch, wherein the wave recording files comprise normal wave recording files and fault wave recording files;
the wave recording identification module is used for identifying the extracted wave recording, firstly identifying whether the file is a normal wave recording file or a fault wave recording file, and if the file is a fault wave recording file, identifying the fault type and extracting two-phase short circuit fault type and three-phase short circuit fault type wave recording files;
the fixed value setting topology analysis module is used for carrying out topology analysis on the selected power distribution network architecture and establishing a power distribution network topology model containing each feeder switch;
a wave recording correlation module: performing associated mapping on the identified wave recording files and feeder switches in the topology analysis module, wherein the identified wave recording files comprise a feeder wave recording fingerprint library, and normal wave recording files and fault wave recording files of each feeder switch;
the recording feature extraction module: the method for processing the data of the recording file according to claim 6, wherein the load current, the three-phase short circuit current and the two-phase short circuit current are subjected to array extraction and smooth value calculation to obtain setting calculation data required at a certain time;
a constant value calculation principle module: the module comprises a feeder switch setting calculation principle and a feeder switch setting calculation method, and comprises an overcurrent I section, an overcurrent II fixed value setting method and a sensitivity calibration method;
a constant value calculation module: according to a constant value calculation principle and a recording characteristic, extracting a smooth value to calculate constant values of an over-current I section and an over-current II section;
a direction judging module: and comparing the three-phase short-circuit current of the associated wave recording file of a certain feeder switch with the three-phase short-circuit current of the associated wave recording file of the previous feeder switch, and judging whether to adopt protection direction judgment or not.
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| CN112505586A (en) * | 2020-12-28 | 2021-03-16 | 国网河北省电力有限公司电力科学研究院 | Fault detection method and device for distribution line in photovoltaic grid-connected power generation system |
| CN113629673B (en) * | 2021-09-14 | 2022-03-01 | 上海山源电子科技股份有限公司 | Relay protection fixed value updating method and device and computer readable storage medium |
| CN114421439B (en) * | 2021-12-28 | 2023-11-24 | 贵州电网有限责任公司 | Power grid protection fixed value data changing method based on visualization and expert system |
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