CN111525523B - New energy power station relay protection fixed value checking method and system based on big data - Google Patents

New energy power station relay protection fixed value checking method and system based on big data Download PDF

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Publication number
CN111525523B
CN111525523B CN202010403726.5A CN202010403726A CN111525523B CN 111525523 B CN111525523 B CN 111525523B CN 202010403726 A CN202010403726 A CN 202010403726A CN 111525523 B CN111525523 B CN 111525523B
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relay protection
power station
value
fixed value
new energy
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CN111525523A (en
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张天保
戴申华
孙自学
陈刚
刘尧
路亚斌
吴家全
王�义
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Anhui State Power Investment And New Power Technology Research Co Ltd
China Datang Group Science and Technology Research Institute Co Ltd East China Electric Power Test Institute
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Anhui State Power Investment And New Power Technology Research Co Ltd
China Datang Group Science and Technology Research Institute Co Ltd East China Electric Power Test Institute
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006Calibration or setting of parameters

Abstract

A new energy power station relay protection fixed value checking method based on big data relates to the field of relay protection setting, solves the problem of how to reduce checking cost, and comprises the following steps: establishing a relay protection setting value database comprising a plurality of new energy power stations; checking the rationality of the first relay protection object parameter of each power station, and extracting the relay protection setting value lists of the same type of each power station; reversely deducing the fixed value of the relay protection unit of the type to obtain a fixed value traceability calculation formula; establishing a standardized virtual power station, and setting the number of each device in the standardized virtual power station; the obtained fixed value tracing calculation formula is applied to a standardized virtual power station, and the same type relay protection object fixed value of the ith power station and the arithmetic weighted average value of the same type relay protection object fixed values of all the power stations are calculated; analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation; the checking method has high accuracy, small maintenance workload of the checking system and high economic benefit.

Description

New energy power station relay protection fixed value checking method and system based on big data
Technical Field
The invention belongs to the technical field of relay protection setting of new energy power stations, and particularly relates to a new energy power station relay protection fixed value checking method and system based on big data.
Background
The relay protection is one of the most important secondary devices of the power system, and the accuracy and the reliability of the relay protection are directly related to the safe operation of the power system. With the economic development, the interconnection scale of a power grid is continuously increased, a large amount of new energy is combined into a grid, and as the common scale of a new energy power station is small, the technical investment is less, the relay protection setting value is set, the maintenance is managed in a loose way, the serious setting and the periodic checking of each power station are difficult to realize, the setting value is more wrong and more leaked, and accidents are frequently caused by the wrong relay protection setting value.
The invention patent of China with an authorization publication number of CN108110739B, namely 'a power distribution network line protection fixed value checking algorithm', specifically discloses: firstly, setting nodes and corresponding parameters of a new energy source accessed to a power distribution network; determining the number of protection which is influenced by new energy access and needs to be subjected to fixed value checking according to the characteristics of 'ring network structure and open loop operation' of the power distribution network; then manually inputting or online collecting the output power of the new energy power supply in the EMS system, and setting the output power as a short circuit calculation initial value; coding the fault calculation result according to the number of the protection to be checked and the branch where the protection is located; then, carrying out fixed value check on phase current protection, zero sequence current protection, interphase distance protection and grounding distance protection, and judging the selectivity and the sensitivity of the phase current protection, the zero sequence current protection, the interphase distance protection and the grounding distance protection; and finally, outputting a checking result.
The problem to be solved by the invention is how to adaptively check the protection constant value of the power distribution network after the new energy is accessed in a large amount, but the problem of how to reduce the cost for checking the relay protection constant value setting of the new energy power station is not solved.
Disclosure of Invention
The invention aims to solve the technical problem of reducing the cost of relay protection constant value setting and checking of a new energy power station.
The invention solves the technical problems through the following technical scheme:
the new energy power station relay protection fixed value checking method based on big data comprises the following steps:
the method comprises the following steps: establishing a relay protection setting value database comprising a plurality of new energy power stations;
step two: checking the rationality of the first relay protection object parameter of each power station, and extracting the relay protection setting value lists of the same type of each power station;
step three: reversely deducing the unit fixed value of the relay protection of the type to obtain a fixed value traceability calculation formula;
step four: establishing a standardized virtual power station, and setting the number of each device in the standardized virtual power station;
step five: applying the fixed value traceability calculation formula obtained in the third step to the standardized virtual power station obtained in the fourth step, and calculating the same type relay protection object fixed value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0
Step six: analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E isi-E0When the deviation is larger than xi, the relay protection object has larger deviation of the fixed value, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the calculation of the relay protection object constant value is reasonable, and at the moment, a single relay protection object constant value is output;
the method for rechecking and recalculating the operation and maintenance personnel comprises the following steps: sorting the deviations of the constant values of relay protection objects of the same type of all the power stations from large to small, and manually analyzing the reasonability of the constant values of the power stations with the maximum deviation of 5 percent; and if the calculated power station relay protection setting value is unreasonable, calculating the reasonability of the power station setting value with the maximum deviation of 10%, if the calculated power station relay protection setting value is reasonable, selecting the power station between 5% and 10% of the maximum deviation for manual rechecking, finding out the critical points, and manually rechecking the unreasonable power station relay protection setting values behind all the critical points.
According to the new energy power station relay protection setting value checking method based on the big data, the standardized virtual power station is established, the deviation is calculated and analyzed to find out the manually rechecked critical point, the power station relay protection setting value with reasonable deviation before the critical point is checked in batches, and the power station relay protection setting value with unreasonable deviation after the critical point is rechecked manually.
As a further improvement of the technical scheme of the invention, the method for establishing the relay protection setting value database comprising a plurality of new energy power stations comprises the following steps:
(1) each power station reports a relay protection constant value list and a main wiring diagram;
(2) establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
system reactance in the minimum mode and system reactance in the maximum mode;
(3) establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
As a further improvement of the technical solution of the present invention, in the third step, the fixed value traceability calculation formula is:
the fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
wherein E isiSetting values of relay protection objects of the same type of the ith power station; e is the current, voltage or impedance of relay protection objects of the same type of the power station; k is a radical ofrelIs a reliability factor; n isctThe transformation ratio or the impedance constant value conversion coefficient of a current transformer or a voltage transformer which is a relay protection object.
As a further improvement of the technical scheme of the invention, in the fourth step, the standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; the system is provided with bus differential protection, transformer protection and collector protection.
As a further improvement of the technical solution of the present invention, in the fourth step, the scale of the standardized virtual power station is set according to the maximum number of certain elements of all new energy power stations included in the calculation.
As a further improvement of the technical solution of the present invention, in the step five, a calculation formula of the arithmetic weighted average of the fixed values of the relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
wherein E is0The method comprises the following steps of (1) carrying out arithmetic weighted average on fixed values of relay protection objects of the same type of all power stations; e1、E2、EiSetting values of relay protection objects of the same type of the 1 st, 2 nd and i th power stations; 1,2,3.
As a further improvement of the technical solution of the present invention, in the sixth step, the calculation formula of the deviation is as follows:
where ξ is the deviation.
Big data-based new energy power station relay protection fixed value checking system includes:
the relay protection setting value database module of the new energy power station is used for reporting a relay protection setting value list and a main wiring diagram to each power station, establishing a main wiring diagram database and establishing a relay protection setting value list;
the checking and extracting module is used for checking the rationality of the first relay protection object parameter of each power station and extracting the relay protection setting value lists of the same type of each power station;
the fixed value traceability calculation module is used for reversely deducing the unit fixed value of the relay protection of the type to obtain a fixed value traceability calculation formula;
the standardized virtual power station module is used for establishing a standardized virtual power station and setting the number of each device in the standardized virtual power station;
a calculation analysis module; the constant value tracing calculation module is used for applying a constant value tracing calculation formula obtained in the constant value tracing calculation module to the standardized virtual power station to calculate the same type relay protection object constant value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0(ii) a And analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E is obtainedi-E0When the deviation is larger than xi, the relay protection object has larger deviation of the fixed value, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the calculation of the relay protection object constant value is reasonable, and at the moment, a relay protection object constant value list is output.
As a further improvement of the technical scheme of the invention, the method for establishing the relay protection fixed value database module of the new energy power station comprises the following steps:
(1) each power station reports a relay protection constant value list and a main wiring diagram;
(2) establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
system reactance in the minimum mode and system reactance in the maximum mode;
(3) establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
As a further improvement of the technical scheme of the present invention, the fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
the standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; bus differential protection, transformer protection and collector protection are configured; the scale of the standardized virtual power station is set according to the maximum number of certain elements of all new energy power stations which are calculated;
the calculation formula of the arithmetic weighted average of the fixed values of the relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
the calculation formula of the deviation is as follows:
where ξ is the deviation.
The invention has the advantages that:
(1) according to the new energy power station relay protection setting value checking method based on the big data, the standardized virtual power station is established, the deviation is calculated and analyzed to find out the manually checked critical point, the power station relay protection setting value with reasonable deviation before the critical point is checked in batches, and the power station relay protection setting value with unreasonable deviation after the critical point is checked in batches.
(2) The big data-based new energy power station relay protection fixed value checking system provided by the invention is small in maintenance workload, has very high economic benefit, and is suitable for new energy power plants with a plurality of new energy power stations.
Drawings
Fig. 1 is a flowchart of a new energy power station relay protection fixed value checking method based on big data according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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 invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
example one
As shown in fig. 1, the new energy power station relay protection setting value checking method based on big data includes the following steps:
the method comprises the following steps: establishing a relay protection setting value database containing a plurality of new energy power stations, wherein the relay protection setting value database comprises the following steps:
(1) and each power station reports a relay protection fixed value list and a main wiring diagram.
(2) Establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
the system reactance in the minimum mode and the system reactance in the maximum mode.
(3) Establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
Taking bus differential protection as an example: the method for setting the fixed value list of the standardized bus differential protection comprises the following steps: the system comprises an action current, a brake coefficient, a current loop disconnection locking, a current loop abnormity alarm, a low voltage fixed value, a zero sequence voltage fixed value, a negative sequence voltage fixed value, a bus-tie failure current fixed value and failure time.
Step two: checking the rationality of the first relay protection object parameter of each power station, and extracting the relay protection constant value lists of the same type of each power station.
Step three: and reversely deducing the unit fixed value of the relay protection of the type to obtain a fixed value traceability calculation formula.
The fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
wherein E isiSetting values of relay protection objects of the same type of the ith power station; e is the current, voltage or impedance of relay protection objects of the same type of the power station; k is a radical ofrelIs a reliability factor; n isctAnd the transformation coefficient from the primary physical quantity to the secondary physical quantity of the relay protection object is a transformation ratio of a current transformer or a voltage transformer or an impedance fixed value transformation coefficient.
Taking bus differential protection as an example, obtaining bus differential protection constant value tracing calculationThe formula is as follows: i isopx=krel*Inx*nct,InxFor connecting the branch maximum load current, IopxIs a differential action current setting value, nctThe transformation ratio of the current transformer is obtained.
Taking an overcurrent protection section of the current collecting wire as an example, a fixed value traceability calculation formula of the overcurrent protection section of the current collecting wire is obtained as follows: i isopkx=krel*Inkx*nct,InkxFor three-phase short-circuit current at the end of the line, IopkxConstant value of one segment for overcurrent protection, nctThe transformation ratio of the current transformer is obtained.
Step four: and establishing a standardized virtual power station, and setting the number of each device in the standardized virtual power station.
The standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; the system is provided with bus differential protection, transformer protection and collector protection.
The scale of the standardized virtual power station is set according to the maximum number of certain elements of all new energy power stations which are included in the calculation; for example, the A power station has 2 main transformers, and the main transformers in all the power stations are the most, so that the main transformers of the standardized virtual power station are set to be 2; for example, 30 collecting lines are provided for the B station, and the collecting line is the largest in all the stations, and the collecting lines of the standardized virtual station are set to be 30, and so on.
Step five: applying the fixed value traceability calculation formula obtained in the third step to the standardized virtual power station obtained in the fourth step, and calculating the same type relay protection object fixed value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0
Step six: analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E isi-E0When the deviation is larger than xi, the relay protection object has larger deviation of the fixed value, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the fixed value of the relay protection object is explainedAnd (4) reasonable calculation, and a relay protection object fixed value list is output at the moment.
The calculation formula of the arithmetic weighted average of the fixed values of the relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
wherein E is0The method comprises the following steps of (1) carrying out arithmetic weighted average on fixed values of relay protection objects of the same type of all power stations; e1、E2、EiSetting values of relay protection objects of the same type of the 1 st, 2 nd and i th power stations; 1,2,3.
The calculation formula of the deviation is as follows:
where ξ is the deviation.
The method for rechecking and recalculating the operation and maintenance personnel comprises the following steps: sorting the deviations of the constant values of relay protection objects of the same type of all the power stations from large to small, and manually analyzing the reasonability of the constant values of the power stations with the maximum deviation of 5 percent; and if the error is not reasonable, calculating the reasonability of the power station fixed value with the maximum deviation of 10%, if the error is reasonable, selecting the power station between 5% and 10% of the maximum deviation for manual rechecking, finally finding out the critical points, and manually rechecking the relay protection fixed values of the power stations behind all the critical points, so that the workload of the manual rechecking can be greatly reduced.
Example two
Big data-based new energy power station relay protection fixed value checking system includes:
a relay protection fixed value database module of the new energy power station; the method is used for reporting the relay protection setting value lists and the main wiring diagram of each power station, establishing a main wiring diagram database and establishing the relay protection setting value lists.
(1) And each power station reports a relay protection fixed value list and a main wiring diagram.
(2) Establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
the system reactance in the minimum mode and the system reactance in the maximum mode.
(3) Establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
Taking bus differential protection as an example: the method for setting the fixed value list of the standardized bus differential protection comprises the following steps: the system comprises an action current, a brake coefficient, a current loop disconnection locking, a current loop abnormity alarm, a low voltage fixed value, a zero sequence voltage fixed value, a negative sequence voltage fixed value, a bus-tie failure current fixed value and failure time.
A check extraction module; and the method is used for checking the rationality of the first relay protection object parameter of each power station and extracting the relay protection setting value list of the same type of each power station.
A fixed value traceability calculation module; the unit fixed value is used for reversely deducing the relay protection unit fixed value of the type to obtain a fixed value traceability calculation formula;
the fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
wherein E isiSetting values of relay protection objects of the same type of the ith power station; e is the current, voltage or impedance of relay protection objects of the same type of the power station; k is a radical ofrelIs a reliability factor; n isctConversion factor of primary to secondary physical quantity for relay protection object, e.g. current transformer or electricityThe transformation ratio of the voltage transformer or the impedance constant value conversion coefficient.
Taking the bus differential protection as an example, the formula for tracing the source of the fixed value of the bus differential protection is obtained as follows: i isopx=krel*Inx*nct,InxFor connecting the branch maximum load current, IopxIs a differential action current setting value, nctThe transformation ratio of the current transformer is obtained.
Taking an overcurrent protection section of the current collecting wire as an example, a fixed value traceability calculation formula of the overcurrent protection section of the current collecting wire is obtained as follows: i isopkx=krel*Inkx*nct,InkxFor three-phase short-circuit current at the end of the line, IopkxConstant value of one segment for overcurrent protection, nctThe transformation ratio of the current transformer is obtained.
A standardized virtual power station module; the method is used for establishing a standardized virtual power station and setting the number of each device in the standardized virtual power station.
The standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; the system is provided with bus differential protection, transformer protection and collector protection.
The scale of the standardized virtual power station is set according to the maximum number of certain elements of all new energy power stations which are included in the calculation; for example, the A power station has 2 main transformers, and the main transformers in all the power stations are the most, so that the main transformers of the standardized virtual power station are set to be 2; for example, 30 collecting lines are provided for the B station, and the collecting line is the largest in all the stations, and the collecting lines of the standardized virtual station are set to be 30, and so on.
A calculation analysis module; the constant value tracing calculation module is used for applying a constant value tracing calculation formula obtained in the constant value tracing calculation module to the standardized virtual power station to calculate the same type relay protection object constant value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0(ii) a And analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E is obtainedi-E0When is greater than xi, a relay is describedThe fixed value deviation of the protected object is large, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the calculation of the relay protection object constant value is reasonable, and at the moment, a relay protection object constant value list is output.
The calculation formula of the arithmetic weighted average of the fixed values of the relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
wherein E is0The method comprises the following steps of (1) carrying out arithmetic weighted average on fixed values of relay protection objects of the same type of all power stations; e1、E2、EiSetting values of relay protection objects of the same type of the 1 st, 2 nd and i th power stations; 1,2,3.
The calculation formula of the deviation is as follows:
where ξ is the deviation.
The method for rechecking and recalculating the operation and maintenance personnel comprises the following steps: sorting the deviations of the constant values of relay protection objects of the same type of all the power stations from large to small, and manually analyzing the reasonability of the constant values of the power stations with the maximum deviation of 5 percent; and if the error is not reasonable, calculating the reasonability of the power station fixed value with the maximum deviation of 10%, if the error is reasonable, selecting the power station between 5% and 10% of the maximum deviation for manual rechecking, finally finding out the critical points, and manually rechecking the relay protection fixed values of the power stations behind all the critical points, so that the workload of the manual rechecking can be greatly reduced.
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; 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 (10)

1. The new energy power station relay protection fixed value checking method based on big data is characterized by comprising the following steps:
the method comprises the following steps: establishing a relay protection setting value database comprising a plurality of new energy power stations;
step two: checking the rationality of the first relay protection object parameter of each power station, and extracting the relay protection setting value lists of the same type of each power station;
step three: reversely deducing the unit fixed value of the relay protection of the type to obtain a fixed value traceability calculation formula;
step four: establishing a standardized virtual power station, and setting the number of each device in the standardized virtual power station;
step five: applying the fixed value traceability calculation formula obtained in the third step to the standardized virtual power station obtained in the fourth step, and calculating the same type relay protection object fixed value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0
Step six: analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E isi-E0When the deviation is larger than xi, the relay protection object has larger deviation of the fixed value, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the calculation of the relay protection object constant value is reasonable, and at the moment, a single relay protection object constant value is output;
the method for rechecking and recalculating the operation and maintenance personnel comprises the following steps: sorting the deviations of the constant values of relay protection objects of the same type of all the power stations from large to small, and manually analyzing the reasonability of the constant values of the power stations with the maximum deviation of 5 percent; and if the calculated power station relay protection setting value is unreasonable, calculating the reasonability of the power station setting value with the maximum deviation of 10%, if the calculated power station relay protection setting value is reasonable, selecting the power station between 5% and 10% of the maximum deviation for manual rechecking, finding out the critical points, and manually rechecking the unreasonable power station relay protection setting values behind all the critical points.
2. The big data-based new energy power station relay protection setting value checking method according to claim 1, wherein the method for establishing the relay protection setting value database containing a plurality of new energy power stations comprises the following steps:
(1) each power station reports a relay protection constant value list and a main wiring diagram;
(2) establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
system reactance in the minimum mode and system reactance in the maximum mode;
(3) establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
3. The big-data-based new energy power station relay protection fixed value checking method according to claim 1, wherein in the third step, the fixed value traceability calculation formula is as follows:
the fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
wherein E isiSetting values of relay protection objects of the same type of the ith power station; e is the current, voltage or impedance of relay protection objects of the same type of the power station; k is a radical ofrelIs a reliability factor; n isctCurrent transformer for relay protection objectOr the transformation ratio of the voltage transformer or the impedance constant value conversion coefficient.
4. The big data based new energy power station relay protection fixed value checking method according to claim 1, wherein in the fourth step, the standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; the system is provided with bus differential protection, transformer protection and collector protection.
5. The big data-based new energy power station relay protection setting value checking method according to claim 4, wherein in the fourth step, the standardized virtual power station is sized according to the maximum number of certain elements of all new energy power stations which are calculated in a counting mode.
6. The big data-based new energy power station relay protection setting value checking method according to claim 1, wherein in the fifth step, a calculation formula of an arithmetic weighted average of the setting values of relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
wherein E is0The method comprises the following steps of (1) carrying out arithmetic weighted average on fixed values of relay protection objects of the same type of all power stations; e1、E2、EiSetting values of relay protection objects of the same type of the 1 st, 2 nd and i th power stations; 1,2,3.
7. The big-data-based new energy power station relay protection setting value checking method according to claim 1, wherein in the sixth step, the calculation formula of the deviation is as follows:
where ξ is the deviation.
8. New energy power station relay protection definite value check system based on big data, its characterized in that includes:
the relay protection setting value database module of the new energy power station is used for reporting a relay protection setting value list and a main wiring diagram to each power station, establishing a main wiring diagram database and establishing a relay protection setting value list;
the checking and extracting module is used for checking the rationality of the first relay protection object parameter of each power station and extracting the relay protection setting value lists of the same type of each power station;
the fixed value traceability calculation module is used for reversely deducing the unit fixed value of the relay protection of the type to obtain a fixed value traceability calculation formula;
the standardized virtual power station module is used for establishing a standardized virtual power station and setting the number of each device in the standardized virtual power station;
a calculation analysis module; the constant value tracing calculation module is used for applying a constant value tracing calculation formula obtained in the constant value tracing calculation module to the standardized virtual power station to calculate the same type relay protection object constant value E of the ith power stationiAnd the arithmetic weighted average value E of the relay protection object fixed values of the same type of all the power stations0(ii) a And analyzing the numerical value of the relay protection object constant value list obtained by calculation to obtain deviation xi, and when E is obtainedi-E0When the deviation is larger than xi, the relay protection object has larger deviation of the fixed value, the system gives an alarm, and operation and maintenance personnel are informed to recheck and recalculate; when E isi-E0When the value is less than xi, the calculation of the relay protection object constant value is reasonable, and at the moment, a relay protection object constant value list is output.
9. The big data-based new energy power station relay protection fixed value checking system as claimed in claim 8, wherein the new energy power station relay protection fixed value database module is established by a method comprising:
(1) each power station reports a relay protection constant value list and a main wiring diagram;
(2) establishing a main junction graph database, wherein the main junction graph database comprises the following contents:
bus data: bus name, voltage class, voltage transformer data;
transformer data: the method comprises the following steps of (1) obtaining a transformer name, a transformer primary side bus name, a transformer secondary side bus name, a primary side rated voltage, a secondary side rated voltage, a rated capacity, a short-circuit reactance, a zero-sequence reactance, a primary side current transformer transformation ratio and a secondary side current transformer transformation ratio;
line data: the method comprises the following steps of (1) line name, initial end bus name, tail end bus name, rated voltage, reactance, resistance, initial end current transformer transformation ratio and tail end current transformer transformation ratio;
system reactance in the minimum mode and system reactance in the maximum mode;
(3) establishing a relay protection fixed value list; setting a relay protection constant value list according to functions, and establishing a standardized constant value list; for a relay protection fixed value which is not required to be set, the fixed value is set to be null.
10. The big-data-based new energy power station relay protection fixed value checking system according to claim 8, wherein the fixed value traceability calculation formula is as follows:
Ei=krel*nct*E (1)
wherein E isiSetting values of relay protection objects of the same type of the ith power station; e is the current, voltage or impedance of relay protection objects of the same type of the power station; k is a radical ofrelIs a reliability factor; n isctThe transformation ratio or impedance constant value conversion coefficient of a current transformer or a voltage transformer which is a relay protection object;
the standardized virtual power station comprises a plurality of 110kV buses, a plurality of 110kV/35kV main transformers, a plurality of current collection circuits, a plurality of 35kV/690V box transformers, a plurality of station transformers, a plurality of sets of SVGs and a photovoltaic array; bus differential protection, transformer protection and collector protection are configured; the scale of the standardized virtual power station is set according to the maximum number of certain elements of all new energy power stations which are calculated;
the calculation formula of the arithmetic weighted average of the fixed values of the relay protection objects of the same type of all the power stations is as follows:
Eo=(E1+E2+...+Ei)/i (2)
wherein E is0The method comprises the following steps of (1) carrying out arithmetic weighted average on fixed values of relay protection objects of the same type of all power stations; e1、E2、EiSetting values of relay protection objects of the same type of the 1 st, 2 nd and i th power stations; 1,2, 3.;
the calculation formula of the deviation is as follows:
where ξ is the deviation.
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CN108233324A (en) * 2017-12-29 2018-06-29 国家电网公司 Electric network model and computational methods based on more power type relay protection setting calculations
AT520806A1 (en) * 2018-01-11 2019-07-15 Sprecher Automation Gmbh Method for triggering a distance protection relay monitoring a zone
CN110932226A (en) * 2019-11-25 2020-03-27 深圳供电局有限公司 Automatic checking system for relay protection setting value

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011172365A (en) * 2010-02-17 2011-09-01 Toshiba Corp Ground fault protection relay system for distribution line
CN104504485A (en) * 2014-11-18 2015-04-08 国家电网公司 Integrative power system relay protection setting calculation method
CN105703337A (en) * 2016-03-02 2016-06-22 上海利乾电力科技有限公司 Industrial power relay protection integrated system
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