CN110470928B - Online detection method for substation/distribution automation system - Google Patents

Online detection method for substation/distribution automation system Download PDF

Info

Publication number
CN110470928B
CN110470928B CN201910690294.8A CN201910690294A CN110470928B CN 110470928 B CN110470928 B CN 110470928B CN 201910690294 A CN201910690294 A CN 201910690294A CN 110470928 B CN110470928 B CN 110470928B
Authority
CN
China
Prior art keywords
power
ied
phase
sum
storage area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910690294.8A
Other languages
Chinese (zh)
Other versions
CN110470928A (en
Inventor
陈成
翟永成
夏晶华
宫献业
庄乾鑫
林恩民
白彦锋
李春久
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Skypower Electric Technology Co ltd
Original Assignee
Beijing Skypower Electric Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Skypower Electric Technology Co ltd filed Critical Beijing Skypower Electric Technology Co ltd
Priority to CN201910690294.8A priority Critical patent/CN110470928B/en
Publication of CN110470928A publication Critical patent/CN110470928A/en
Application granted granted Critical
Publication of CN110470928B publication Critical patent/CN110470928B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention provides an online detection method for a transformer substation/distribution automation system, which comprises the following steps: acquiring analog quantity switching value data acquired by each IED in each power node in an automatic system at a certain moment by taking a data acquisition storage area of the IED as an interface; judging that data in an IED data acquisition storage area in each power node is unbalanced according to a power balance principle in the power node; determining that the operation state of an analog quantity loop before an IED data acquisition storage area is abnormal; acquiring analog quantity and switching quantity data of each IED installation position for detection in a certain period of time, and inputting the acquired analog quantity and switching quantity data into an IED data acquisition storage area by a master station; if the IED action behavior is judged to be incorrect; determining that a communication protocol, a protection function, an automation function and a technical performance running state behind an IED data acquisition storage area are abnormal; after any of the above-described abnormalities have occurred, maintenance is performed.

Description

Online detection method for substation/distribution automation system
Technical Field
The invention relates to the technical field of electric power automation, in particular to an online detection method for a transformer substation/distribution automation system.
Background
In the operation and running of a transformer substation/distribution automation system, the problems that wiring errors, poor contact, disconnection or abnormity of a device data acquisition system at an interval of a voltage or current transformer secondary circuit at a certain interval cannot be found in time exist; the problem that the communication protocols, the protection functions, the automation functions and the technical performance of secondary equipment such as relay protection, safety automatic devices, power distribution terminals and the like cannot be found in time is solved.
In the prior art, a transformer substation/distribution automation system does not perform online detection on a secondary wiring loop of a voltage transformer and a current transformer in the system at intervals at a main station; the main station does not perform online detection on the communication protocols, protection functions, automation functions and technical performances of the interval relay protection and safety automatic devices and the power distribution terminals in the system; in order to ensure the normal operation of a transformer substation/distribution automation system, fault maintenance and periodic maintenance can be carried out on primary and secondary equipment of the system.
During the time interval of two regular overhauls, if the operation of the transformer substation/distribution automation system is abnormal and a short-circuit fault occurs in a primary system, the transformer substation/distribution automation system may malfunction or fail, the accident range may be enlarged, and unnecessary economic loss is caused.
Disclosure of Invention
The invention provides an online detection method for a substation/distribution automation system, aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: an online detection method for a substation/distribution automation system, comprising:
acquiring analog quantity switching value data acquired by each IED in each power node in an automatic system at a certain moment by taking a data acquisition storage area of the IED as an interface;
judging that data in the inter IED data acquisition storage areas in each power node are unbalanced according to a power balance principle in the power nodes;
determining that the system running state before an IED data acquisition storage area is abnormal;
and/or the presence of a gas in the gas,
analog quantity and switching value data of a certain period of time at installation positions of IEDs for detection are obtained,
the master station inputs the acquired analog quantity and switching quantity data into an IED data acquisition storage area; the master station is monitoring equipment arranged in a transformer substation automation system or a power distribution automation system;
the IED performs data calculation according to analog quantity and switching quantity data input by the master station to the data acquisition storage area at the same moment, executes functional logic and generates corresponding action behaviors;
if the IED action behavior is judged to be incorrect;
determining that a communication protocol, a protection function, an automation function and a technical performance running state behind an IED data acquisition storage area are abnormal;
after any of the above-described abnormalities have occurred, maintenance is performed.
The invention has the beneficial effects that: by designing the online detection method for the transformer substation/power distribution automation system, the system in front of the IED data acquisition storage area is detected by utilizing the principle of power balance in the same power node at the same moment, so that the transformer substation/power distribution automation system has online detection capability, a system analog quantity loop is detected in real time, abnormal conditions of the system analog quantity loop in operation are found in time, the system analog quantity loop in operation is detected online without power outage, and the accuracy of a detection result is improved. The method has the advantages that the required detection data information is input into the IED data acquisition storage region according to the detection content, the system function behind the IED data acquisition storage region is operated in a trial mode, the working state of the system function behind the IED data acquisition storage region is detected, the abnormal state of the system function in the operation process is found in time, the reliability of the system function is improved, comprehensive online detection of the transformer substation/distribution automation system is achieved, and state detection is achieved.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the step of determining that data in the inter-IED data collection storage areas in each power node are unbalanced according to a power balance principle in the power node includes:
calculating the sum of the active power of each power node according to the characteristic that the sum of the active power in the same power node is approximately zero at the same moment of the power system;
if the sum of the active power is zero; the power obtained by calculating the data collected by each IED in the same power node is balanced, the previous system part of the data collection storage area of each IED in the same power node is normal in running state, the PT and CT secondary circuits are normal, the polarity and the phase sequence are correct, and the A/D analog quantity data collection circuit of the IED is normal;
and if the sum of the active power is greater than the unbalanced threshold fixed value, the operating state of an analog quantity loop in front of a certain IED data acquisition storage area is abnormal and the related part in a certain interval is abnormal.
Further, the acquiring analog quantity switching quantity data acquired by each IED in a certain power node in the automation system at a certain time by using the data acquisition storage area of the IED as an interface includes:
the active power of the incoming line of each power node, the sum of all A-phase active powers of each power node, the sum of all B-phase active powers of each power node, the sum of all C-phase active powers of each power node, and the sum of all three-phase active powers of each power node.
The beneficial effect of adopting the further scheme is that: according to the principle of power balance in the same power node at the same time of the power system, the master station acquires each power data acquired by each IED in each power node in the automatic system at the same time at fixed time intervals, so that data analysis is facilitated, the sensitivity of a detection result is improved, and the detection efficiency is improved.
Further, the step of determining that data in the inter-IED data acquisition storage areas in each power node are unbalanced according to a power balance principle in the power node includes:
calculating a power unbalance threshold fixed value according to the active power of the incoming line;
judging whether the absolute value of the sum of the active power of the phase A, the absolute value of the sum of the active power of the phase B and the absolute value of the sum of the active power of the phase C are smaller than the product of one third of the threshold fixed value of the unbalanced power and the corresponding ratio of the incoming line phase current to the corresponding rated current of the incoming line or whether the absolute value of the sum of the active power of the three phases is smaller than the product of one third of the threshold fixed value of the unbalanced power and the corresponding ratio of the incoming line three-phase current to the corresponding rated current of the incoming line;
and if not, the power data in the power node is unbalanced.
The beneficial effect of adopting the further scheme is that: according to the principle of power balance in the same power node at the same time of the power system, the sensitivity of a detection result is improved and the detection efficiency is improved by comparing and analyzing specific numerical values.
Further, the calculation formula of the power imbalance threshold value is as follows:
ΔPSET＝|Pie incoming line|×5％
Wherein, Δ PSETSetting a threshold value for power imbalance of the ith power node, wherein SET is a theoretical preset point, | Pie incoming lineI is the inlet wire rated active power of the ith power node;
the calculation formula of the imbalance of the active power of each phase and the active power of three phases is as follows:
Figure BDA0002147679710000041
Figure BDA0002147679710000042
Figure BDA0002147679710000043
Figure BDA0002147679710000044
wherein, Sigma PAIs the sum of A-phase active power, SIG PBFor B-phase active power sum, sigma PCIs the sum of C-phase active power, and SIG P is the sum of three-phase active power, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
Further, for one of the power nodes, the calculation formula of the active power and the absolute value of each phase and the active power and the absolute value of the three phases is as follows:
∑PA＝PA1+PA2+...PAi
∑PB＝PB1+PB2+...PBi
∑PC＝PC1+PC2+...PCi
∑P＝P1+P2+...Pi
wherein the content of the first and second substances,
∑PAis the sum of the active power of the A phase;
∑PBthe sum of the active power of the B phase;
∑PCthe sum of the active power of the C phase;
sigma P is the sum of three-phase active power;
PA1active power for phase a of IED 1;
PA2active power for phase a of IED 2;
PAiphase a active power for IEDi;
PB1active power for phase B of IED 1;
PB2active power for phase B of IED 2;
PBiphase B active power for IEDi;
PC1active power for phase C of IED 1;
PC2active power for phase C of IED 2;
PCiphase C active power for IEDi;
P1three-phase active power for IED 1;
P2three-phase active power for IED 2;
Pithree-phase active power being IEDi;
further, the calculation formula of the imbalance of the active power of each phase and the active power of three phases is as follows:
Figure BDA0002147679710000051
Figure BDA0002147679710000052
Figure BDA0002147679710000053
Figure BDA0002147679710000054
wherein, Sigma PAIs the sum of A-phase active power, SIG PBIs the sum of B-phase active power, SIG PCIs the sum of C-phase active power, and SIG P is the sum of three-phase active power, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
The beneficial effect of adopting the further scheme is that: according to the principle of power balance in the same power node at the same moment, on the basis of three-phase active power, a split-phase active power calculation method is adopted, and a power unbalance threshold automatically floats and changes in proportion to the actual incoming line load. By adopting the split-phase active power and the ratio of each phase current of the incoming line to the rated current of the incoming line to calculate and analyze, the sensitivity of judging the power imbalance is improved, the detection sensitivity is improved, and the detection efficiency is improved.
Further, the step of the master station inputting the acquired analog quantity and switching quantity data into the IED data acquisition storage area includes:
after the master station inputs the acquired analog quantity and switching quantity data into an IED data acquisition storage area, ready information is generated;
generating a synchronous starting detection instruction according to the ready information;
sending a synchronous start detection instruction to the IED;
and controlling the IED to start simulation work at the same time according to the synchronous starting detection instruction and the analog quantity and switching quantity data.
The beneficial effect of adopting the further scheme is that: by applying the preset detection data information to the IED data acquisition storage area, the IED can run functional logic by using input data, and perform online detection on a system behind the IED data acquisition storage area without adding external test equipment, so that the detection cost and the detection difficulty are reduced.
Further, the step of determining that the IED action behavior is incorrect includes:
acquiring action behavior information of the IED;
and analyzing whether the communication protocol to be detected, the protection function, the automation function and the technical performance are operated correctly or not according to the action behavior information.
The beneficial effect of adopting the further scheme is that: by collecting action behavior information generated by the IED by using data input to the data acquisition storage area, whether the system function behind the IED data acquisition storage area works normally is judged, the correctness of a communication protocol, the reasonability of fixed value setting, the correctness of functional logic and the like can be detected, the awareness of the system function is improved, abnormal states of the system are found in time and maintenance is arranged, the probability of system misoperation or rejection is reduced, the safety and reliability of system operation are improved, unnecessary periodic maintenance is omitted, the power failure time is reduced, and the economic benefit of system operation is improved.
Further, the system before the IED data acquisition storage area comprises: the system comprises a voltage transformer, a current transformer secondary circuit and an analog quantity data acquisition system of the IED;
the system behind the IED data acquisition storage area comprises: communication protocols, protection functions, automation functions and technical capabilities.
Further, the power node comprises: a bus-type power node, a transformer-type power node, and a tie-line-type power node.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic main wiring diagram of a substation according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a main connection of a power distribution network according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of interfaces of a power node and an IED data collection storage area according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of interfaces of a secondary system and an IED data acquisition storage area according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart of an online detection method according to an embodiment of the present invention.
Fig. 6 is a second schematic flowchart of the online detection method according to the embodiment of the present invention.
Fig. 7 is a third schematic flowchart of an online detection method according to an embodiment of the present invention.
Fig. 8 is a fourth schematic flowchart of the online detection method according to the embodiment of the present invention.
Fig. 9 is a fifth schematic flowchart of an online detection method according to an embodiment of the present invention.
The reference numbers illustrate: 1-bus power node; 2-transformer power node; 3-a relay protection device; 4-tie line power node; 5-ring net cage; 6-ring net chamber; 7-a switching station; 8, a terminal; 9-column switch FS; 10-a circuit breaker; 11-a transformer substation; 12-a substation bus I bus power node; 13-current transformer CT; 14-a voltage transformer PT; 15-IED data acquisition system; 16-IED; 17-IED data collection storage area interface; 18-a logical compute execution system; 19-a master station; 20-switching value input; 21-switching value output; 22-a CPU system; 23-voltage formation and conditioning; 24-A/D conversion; 25-a switch; 26-a local master station; 27-a remote master station; 28-a communication manager; 29-Ethernet A; 30-Ethernet B; 31-a timing network; 32-a dispatch network; 33-interval PT, CT, switch.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 9, fig. 1 is a schematic main wiring diagram of a substation according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a main connection of a power distribution network according to an embodiment of the present invention. Fig. 3 is a schematic diagram of interfaces of a power node and an IED data collection storage area according to an embodiment of the present invention. Fig. 4 is a schematic diagram of interfaces of a secondary system and an IED data acquisition storage area according to an embodiment of the present invention. Fig. 5 is a schematic flow chart of an online detection method according to an embodiment of the present invention. Fig. 6 is a second schematic flowchart of the online detection method according to the embodiment of the present invention. Fig. 7 is a third schematic flowchart of an online detection method according to an embodiment of the present invention. Fig. 8 is a fourth schematic flowchart of the online detection method according to the embodiment of the present invention. Fig. 9 is a fifth schematic flowchart of an online detection method according to an embodiment of the present invention.
The embodiment of the invention provides an online detection method for a transformer substation/distribution automation system, which comprises the following steps:
s1: acquiring analog quantity switching value data acquired by each IED in each power node in an automatic system at a certain moment by taking a data acquisition storage area of the IED as an interface;
s2: judging that data in an IED data acquisition storage area in each power node is unbalanced according to a power balance principle in the power node;
s3: determining that the system running state before an IED data acquisition storage area is abnormal;
and/or the presence of a gas in the gas,
s4: acquiring analog quantity and switching value data of each IED installation position for detection in a certain period of time;
s5: the master station inputs the acquired analog quantity and switching quantity data into an IED data acquisition storage area; the master station is monitoring equipment arranged in a transformer substation automation system or a power distribution automation system;
s6: the IED performs data calculation according to analog quantity and switching quantity data input by the master station to the data acquisition storage area at the same moment, executes functional logic and generates corresponding action behaviors;
s7: if the IED action behavior is judged to be incorrect;
s8: determining that a communication protocol, a protection function, an automation function and a technical performance running state behind an IED data acquisition storage area are abnormal;
s9: after any of the above-described abnormalities have occurred, maintenance is performed.
The invention has the beneficial effects that: by designing the online detection method for the transformer substation/power distribution automation system, the system in front of the IED data acquisition storage area is detected by utilizing the principle of power balance in the same power node at the same moment of the power system, so that the transformer substation/power distribution automation system has online detection capability, a series analog quantity loop is detected in real time, abnormal conditions of the system analog quantity loop in operation are found in time, the system analog quantity loop in operation is detected online without power outage, and the accuracy of a detection result is improved. The method has the advantages that the required detection data information is input into the IED data acquisition storage area according to the detection content, and the system data calculation and function logic function behind the IED data acquisition storage area is operated to detect the working state of the system function behind the IED data acquisition storage area, timely find the abnormal state of the system function in operation, improve the reliability of the system function, realize the comprehensive online detection of the transformer substation/distribution automation system, and achieve the state detection.
The transformer substation automation system comprises a transformer substation local monitoring master station, a communication network, communication equipment and a relay protection and safety automation device; the power distribution automation system comprises a power distribution monitoring main station, a communication network and a power distribution terminal. Hereinafter, a local monitoring master station and a power distribution monitoring master station of a transformer substation are collectively called as a master station, and secondary devices such as a relay protection and safety automatic device and a power distribution terminal are collectively called as an IED.
Further, the step of determining that data in the inter-IED data collection storage areas in each power node are unbalanced according to a power balance principle in the power node includes:
calculating the sum of the active power of each power node according to the characteristic that the sum of the active power in the same power node is approximately zero at the same moment of the power system;
if the sum of the active power is zero; the power obtained by calculating the data acquired by each IED in the same power node of the power system is balanced, the previous system part in the data acquisition storage areas of each IED in the same power node of the system is normal in running state, PT and CT secondary circuits are normal, the polarity and the phase sequence are correct, and an A/D analog quantity data acquisition circuit of the IED is normal;
and if the sum of the active power is greater than the unbalanced threshold fixed value, the operating state of an analog quantity loop in front of a certain IED data acquisition storage area is abnormal and the related part in a certain interval is abnormal.
Further, the acquiring analog quantity switching quantity data acquired by each IED in a certain power node in the automation system at a certain time by using the data acquisition storage area of the IED as an interface includes:
the active power of the incoming line of each power node, the sum of all A-phase active powers of each power node, the sum of all B-phase active powers of each power node, the sum of all C-phase active powers of each power node, and the sum of all three-phase active powers of each power node.
According to the principle of power balance in the same power node at the same time, the master station acquires each power data acquired by each IED in each power node at the same time at fixed time intervals, so that data analysis is facilitated, the sensitivity of a detection result is improved, and the detection efficiency is improved.
Further, the step of determining that data in the inter-IED data acquisition storage areas in each power node are unbalanced according to a power balance principle in the power node includes:
calculating a power unbalance threshold fixed value according to the active power of the incoming line;
judging whether the absolute value of the sum of the active power of the phase A, the absolute value of the sum of the active power of the phase B and the absolute value of the sum of the active power of the phase C are smaller than the product of one third of the threshold fixed value of the unbalanced power and the corresponding ratio of the incoming line phase current to the corresponding rated current of the incoming line or whether the absolute value of the sum of the active power of the three phases is smaller than the product of one third of the threshold fixed value of the unbalanced power and the corresponding ratio of the incoming line three-phase current to the corresponding rated current of the incoming line;
and if not, the power data in the power node is unbalanced.
According to the principle of power balance in the same power node at the same moment, the sensitivity of a detection result is improved and the detection efficiency is improved by comparing and analyzing specific numerical values.
Further, the calculation formula of the power imbalance threshold value is as follows:
ΔPSET＝|Pie incoming line|×5％
Wherein, Δ PSETSetting a threshold value for power imbalance of the ith power node, wherein SET is a theoretical preset point, | Pie incoming lineI is the inlet wire rated active power of the ith power node;
the calculation formula of the imbalance of the active power of each phase and the active power of three phases is as follows:
Figure BDA0002147679710000101
Figure BDA0002147679710000102
Figure BDA0002147679710000103
Figure BDA0002147679710000104
wherein, Sigma PAIs the sum of A-phase active power, SIG PBFor B-phase active power sum, sigma PCIs the sum of C-phase active power, sigma P is three-phaseSum of work powers, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
Further, for one of the power nodes, the calculation formula of the active power and the absolute value of each phase and the active power and the absolute value of the three phases is as follows:
∑PA＝PA1+PA2+...PAi
∑PB＝PB1+PB2+...PBi
∑PC＝PC1+PC2+...PCi
∑P＝P1+P2+...Pi
wherein the content of the first and second substances,
∑PAis the sum of the active power of the A phase;
∑PBthe sum of the active power of the B phase;
∑PCthe sum of the active power of the C phase;
sigma P is the sum of three-phase active power;
PA1active power for phase a of IED 1;
PA2active power for phase a of IED 2;
PAiphase a active power for IEDi;
PB1active power for phase B of IED 1;
PB2active power for phase B of IED 2;
PBiphase B active power for IEDi;
PC1active power for phase C of IED 1;
PC2active power for phase C of IED 2;
PCiphase C active power for IEDi;
P1three-phase active power for IED 1;
P2three-phase active power for IED 2;
Pithree-phase active power for IEDiRate;
further, the calculation formula of the imbalance of the active power of each phase and the active power of three phases is as follows:
Figure BDA0002147679710000111
Figure BDA0002147679710000121
Figure BDA0002147679710000122
Figure BDA0002147679710000123
wherein, Sigma PAIs the sum of A-phase active power, SIG PBIs the sum of B-phase active power, SIG PCIs the sum of C-phase active power, and SIG P is the sum of three-phase active power, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
According to the principle of power balance in the same power node at the same moment, on the basis of three-phase active power, a split-phase active power calculation method is adopted, and a power unbalance threshold automatically floats and changes in proportion to the actual incoming line load. By adopting the split-phase active power and the ratio of each phase current of the incoming line to the rated current of the incoming line to calculate and analyze, the sensitivity of judging the power imbalance is improved, the detection sensitivity is improved, and the detection efficiency is improved.
Further, the step of the master station inputting the acquired analog quantity and switching quantity data into the IED data acquisition storage area includes:
after the master station inputs the acquired analog quantity and switching quantity data into an IED data acquisition storage area, ready information is generated;
generating a synchronous starting detection instruction according to the ready information;
sending a synchronous start detection instruction to the IED;
and controlling the IED to start simulation operation at the same time according to the synchronous start detection finger and the analog quantity and switching quantity data.
By applying the preset detection data information to the IED data acquisition storage area, the IED can run functional logic by using input data, and perform online detection on a system behind the IED data acquisition storage area without adding external test equipment, so that the detection cost and the detection difficulty are reduced.
Further, the step of determining that the IED action behavior after the IED data collection storage area is incorrect includes:
acquiring action behavior information of the IED;
and analyzing whether the communication protocol to be detected, the protection function, the automation function and the technical performance are operated correctly or not according to the action behavior information.
By collecting action behavior information generated by the IED by using data input to the data acquisition storage area, whether the system function behind the IED data acquisition storage area works normally is judged, the correctness of a communication protocol, the reasonability of fixed value setting, the correctness of functional logic and the like can be detected, the awareness of the system function is improved, abnormal states of the system are found in time and maintenance is arranged, the probability of system misoperation or rejection is reduced, the safety and reliability of system operation are improved, unnecessary periodic maintenance is omitted, the power failure time is reduced, and the economic benefit of system operation is improved.
Further, the system before the IED data acquisition storage area comprises: the system comprises a voltage transformer, a current transformer secondary circuit and an analog quantity data acquisition system of the IED;
the system behind the IED data acquisition storage area comprises: communication protocols, protection functions, automation functions and technical capabilities.
Further, the power node comprises: a bus-type power node, a transformer-type power node, and a tie-line-type power node.
Further, by taking the power node and IED data collection storage area interface diagram shown in fig. 3 as an example, as shown in fig. 5 and fig. 6, a schematic block diagram of the online detection method is explained.
In fig. 3, the power node is a substation bus I power node. The power node comprises a transformer low-voltage side IED1, a PT1 and a CT1, an outgoing line IED2, a PT1 and a CT2, an outgoing line IED3, a PT1 and a CT3, an outgoing line IED4, a PT1 and a CT4, an outgoing line IED5, a PT1 and a CT5, a bus-coupled IED6 and PT1 and CT 6. The IEDs 1-6 are connected to a substation automation system master station via an Ethernet network.
The online detection method of the previous system in the IED data acquisition storage area is described below through a substation bus I power node, and the working states of each interval voltage transformer, each current transformer loop and each IED data acquisition system in the substation bus I power node of the system are detected online.
As shown in fig. 5, S51: detecting a previous system of an IED data acquisition storage area;
step one S52: the IED data acquisition system synchronously acquires interval data and sends the interval data to a data acquisition storage area;
after power-on operation, each IED data acquisition system of the IEDs 1-6 synchronously acquires analog quantity and switching quantity data information such as connected intervals PT, CT and switching contacts in real time.
Step two S53: the device logic computation execution system computes data acquisition storage area data;
the local monitoring master sends simultaneous calculation commands to the IEDs in the same power node at regular time intervals, which may be defined as 10 minutes in the present embodiment, with minutes as the minimum unit.
And the master station sends commands for simultaneously calculating to all IEDs (IEDs 1-6) in the bus I power node, wherein the commands comprise the current calculation time and a calculation sequence number, the sequence number is added with 1 every time, and the sequence number circulates from 1 to 1440.
After receiving the command and reaching the designated time, each IED starts to calculate, calculates the three-phase power, each phase voltage and the amplitude of the current of the interval, and records as: and P, PA, PB, PC, UA, UB, UC, IA, IB and IC, and after the calculation is finished, the data are stored according to the calculation serial numbers to wait for calling of the master station.
Wherein, P is three-phase active power, PA is A-phase active power, PB is B-phase active power, PC is phase active power, UA is A-phase voltage, UB is B-phase voltage, UC is B-phase voltage, IA is A-phase current, IB is B-phase current, and IC is B-phase current.
Step three S54: the master station receives all interval data in the functional nodes;
the master station calls and receives the calculation data stored in the IEDs in sequence according to the sequence of the IEDs 1-6, and stores the data according to the calculation sequence number;
step four S55: judging whether the power of the power node is balanced;
for all IED active power sets in the bus I power node, there are:
Figure BDA0002147679710000141
wherein the content of the first and second substances,
PA1、PA2、PAiphase a active power for IEDi; i is 1 to 6
PB1、PB2、PBiPhase B active power for IEDi; i is 1 to 6
PC1、PC2、PCiPhase C active power for IEDi; i is 1 to 6
P1、P2、PiThree-phase active power being IEDi; i is 1 to 6
Separately calculating sigma PA、∑PB、∑PC、∑P。
∑PA＝PA1+PA2+PA3+PA4+PA5+PA6..
∑PB＝PB1+PB2+PB3+PB4+PB5+PB6..
∑PC＝PC1+PC2+PC3+PC4+PC5+PC6..
∑P＝P1+P2+P3+P4+P5+P6..
In the formula:
∑PAfor A-phase active power sum, Sigma PBFor B-phase active power sum, sigma PCThe sum of C-phase active power and the sum of Sigma P of three-phase active power;
the power imbalance calculation formula is as follows:
Figure BDA0002147679710000151
Figure BDA0002147679710000152
Figure BDA0002147679710000153
Figure BDA0002147679710000154
in the formula:
ΔPSET＝|Pie incoming lineEquation (9) | x 5%............... d
ΔPSETSetting a threshold value for the power imbalance of the ith power node; pie incoming lineRated active power for incoming line, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
On the basis of three-phase active power, split-phase active power calculation is adopted, the unbalanced power threshold automatically floats, and the threshold changes in proportion to the actual inlet wire load current. By adopting the split-phase active power, the unbalanced power threshold and the ratio of each phase current of the inlet wire to the rated current of the inlet wire to calculate and analyze, the sensitivity of judging the unbalanced power is improved, the detection sensitivity is improved, and the detection efficiency is improved.
In this example, the low-voltage side of the transformer is the incoming line of a bus I power node, and the data collected by the corresponding IED1 is the incoming line data of the power node.
And when the formula (5), the formula (6), the formula (7) and the formula (8) are not satisfied, judging that the power nodes are in power balance. The previous system operation in the data acquisition storage area of each IED in the power node is normal, that is, the analog quantity loop is normal. The polarity and phase sequence of CT and PT at each interval are normal, and the secondary wiring loop is normal; an A/D analog quantity data acquisition loop of each interval IED is normal; the IED of each bay is normal in time synchronization
When any one of the formulas (5), (6), (7) and (8) is satisfied, the power node is judged to be unbalanced in power, and the abnormal operation of the system before a certain IED data acquisition storage area in the power node is indicated, namely the abnormal operation of a system analog quantity loop is indicated. The polarity and phase sequence of CT and PT in a certain interval in the power node are possibly abnormal, a secondary wiring loop is possibly abnormal, and an A/D analog quantity loop of IED in a certain interval is possibly abnormal; an IED pair in a certain bay may be abnormal; the cause of the abnormality needs to be checked immediately.
Further, when the formula (5) is satisfied, it can be determined that the phase A analog loop of the power node is abnormal; when the formula (6) is satisfied, the power node B phase analog loop is judged to be abnormal; when the formula (7) is satisfied, the abnormality of the C-phase analog loop of the power node can be judged; when the formula (8) is satisfied, the abnormality of the A-phase, B-phase or C-phase analog loop of the power node can be judged;
taking fig. 3 as an example, when the substation IED is in live operation, the master station simulates F1-F6 points to cause respective failures, and the method for applying analog quantity and remote quantity data to the IED data acquisition storage area and detecting the communication protocol, the protection function, the automation function, the communication network and the system performance of the system after the IED data acquisition storage area on line is described.
As shown in fig. 6, S61: carrying out system detection after IED data acquisition storage area;
the method comprises the following steps: determining detection content
And detecting whether the action behaviors of the IEDs 1-6 are correct when 11 faults of A-phase grounding, B-phase grounding, C-phase grounding, AB-phase short circuit, BC-phase short circuit, CA-phase short circuit, AB-phase short circuit grounding, BC-phase short circuit grounding, CA-phase short circuit grounding, ABC three-phase short circuit grounding and the like occur at the F1 point. The method is used for analyzing whether the setting value of each IED is reasonable or not, whether the setting value is correct or not, whether the communication and the function related to multiple intervals are correct or not and the like.
Step two: respectively generating analog quantity and switching quantity data of IED corresponding to each fault at F1 point
According to the actual system parameters, the dynamic recording wave generation data, the digital-analog recording wave generation data, the field test recording wave generation data and the like can be used. The data may be instantaneous sample values, and may be valid values.
And converting the data generated in each case into analog quantity and switching quantity data of the corresponding IED and storing the data to the master station.
S62: inputting analog quantity and switching value data to an IED data acquisition storage area;
and the master station inputs analog quantity and switching quantity data of IEDs 1-6 corresponding to the fault at the F1 point into each IED data acquisition storage area.
The method is divided into two detection modes.
One fault type is detected at a time, analog quantity switching value data corresponding to one fault type is input into an IED 1-6 data acquisition storage area, 11 times are divided, and one fault type is made at a time according to the sequence of 11 fault types such as A-phase grounding, B-phase grounding, C-phase grounding, AB-phase short circuit, BC-phase short circuit, CA-phase short circuit, AB-phase short circuit grounding, BC-phase short circuit grounding, CA-phase short circuit, ABC three-phase short circuit grounding and the like.
And detecting multiple fault types at one time, inputting analog quantity switching value data corresponding to multiple types into IEDs 1-6 data acquisition storage areas in sequence, making 2-11 fault types at an F1 point at one time, and inputting the fault types into the IED data acquisition storage areas in sequence.
S63: the device logic computation execution system executes the computation and the functional logic;
the master station software sends synchronous starting detection commands to the IEDs 1-6, and after each IED receives the synchronous starting detection commands, the IEDs start to enter data calculation and function logic at the same time and generate corresponding action behaviors according to the received data;
s64: judging whether the action behavior of the device is correct or not;
corresponding to fig. 3, an interface diagram of the secondary system and the IED data acquisition storage area in fig. 4 is shown. The dashed lines in fig. 4 represent the IED data collection storage area interface. The IEDs 1-6 upload the online detection action to the master station, and the master station generates a report of the online detection, wherein the report comprises action information and non-action information. In this example, the detection IEDs 1-6 are selected, and the detection IEDs 1-7 or some of them may be selected.
If the IEDs 1-6 are correct in action behavior, it is indicated that each IED communication protocol is correct, the protection function is normal, the automation function is normal, the technical index is normal, and the bay level and the dispatching communication network are normal.
If one or more IEDs are incorrect in action, the automation system is not operated normally, the IEDs and the communication network are possible to be abnormal. The IED may have a protection setting error (errors of a pressure plate, a fixed value, a control word, etc.), the IED may have an unreasonable protection setting value, may have a functional logic defect, and the communication network may have abnormalities such as a broken line and a high error rate, which require timely checking and solving the abnormality cause.
If the A-phase ground fault occurs at the F2 point, the actions of the IEDs 1-6 are exactly that the IED2 interrupts the overcurrent action, and the IED1 and the IEDs 3-6 do not act. If the IED2 is in quick-break overcurrent no action, the IED1 acts as backup protection, even if the IED in the IEDs 3-6 acts, the action is incorrect, the reason that the IED2 is in quick-break overcurrent no action is probably that quick-break overcurrent including no input of control words, or that quick-break overcurrent protection constant value setting is too high and the setting is unreasonable, and the actions can be given in an online detection report of the master station. Therefore, the abnormal state of the IED can be found in time, the probability of system misoperation or system malfunction is reduced, and the system operation safety is improved
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. An online detection method for a substation/distribution automation system, characterized by comprising:
acquiring analog quantity switching value data acquired by each IED in each power node in an automatic system at a certain moment by taking a data acquisition storage area of the IED as an interface;
judging that data in the inter IED data acquisition storage areas in each power node are unbalanced according to a power balance principle in the power nodes;
determining that the operation state of an analog quantity loop before an IED data acquisition storage area is abnormal;
after the abnormality occurs, performing maintenance;
the acquiring analog quantity switching quantity data acquired by each IED in each power node in an automation system at a certain moment by taking the data acquisition storage area of the IED as an interface comprises the following steps:
the active power of an incoming line of each power node, the sum of all A-phase active powers of each power node, the sum of all B-phase active powers of each power node, the sum of all C-phase active powers of each power node and the sum of all three-phase active powers of each power node;
the step of judging that the data of the inter-IED data acquisition storage area in each power node is unbalanced according to the power balance principle in the power node comprises the following steps:
calculating a power unbalance threshold fixed value according to the active power of the incoming line;
judging whether the absolute value of the sum of the active power of the phase A, the absolute value of the sum of the active power of the phase B and the absolute value of the sum of the active power of the phase C are respectively smaller than one third of the threshold fixed value of the unbalanced power and the product of the corresponding phase current of the incoming line and the corresponding rated current ratio of the incoming line, or whether the absolute value of the sum of the active power of the three phases is smaller than the product of one third of the threshold fixed value of the unbalanced power and the corresponding three-phase current of the incoming line and the corresponding rated current ratio of the incoming line;
and if not, the power data in the power node is unbalanced.
2. The on-line detection method for substation/distribution automation system as claimed in claim 1, wherein the step of determining the existence of imbalance of data in the inter-IED data collection storage area in each power node according to the principle of power balance in power node comprises:
calculating the sum of the active power of each power node according to the characteristic that the sum of the active power in the power nodes at the same moment of the power system is approximately zero;
if the sum of the active power is zero; the analog quantity loop in front of each IED data acquisition storage area in the same power node is normal in operation state, the PT and CT secondary loops are normal, the polarity and the phase sequence are correct, and the A/D analog quantity data acquisition loop of the IED is normal;
and if the sum of the active power is greater than the unbalanced threshold fixed value, the operating state of an analog quantity loop in front of a certain IED data acquisition storage area is abnormal and the related part in a certain interval is abnormal.
3. The on-line detection method for substation/distribution automation systems according to claim 1,
the calculation formula of the power unbalance threshold fixed value is as follows:
ΔPSET＝|Pie incoming line|×5％
Wherein, Δ PSETSetting a threshold value for power imbalance of the ith power node, wherein SET is a theoretical preset point, | Pie incoming lineI is the inlet wire rated active power of the ith power node;
the calculation formula of the imbalance of the active power of each phase and the active power of three phases is as follows:
Figure FDA0003098767860000021
Figure FDA0003098767860000022
Figure FDA0003098767860000023
Figure FDA0003098767860000024
wherein, Sigma PAIs the sum of A-phase active power, SIG PBIs the sum of B-phase active power, SIG PCIs the sum of C-phase active power, and SIG P is the sum of three-phase active power, IA incoming lineFor feeding in phase A current, IB incoming lineFor feeding in phase B current, IC incoming lineFor feeding in C-phase current, Ie incoming lineThe rated current is input.
4. An online detection method for substation/distribution automation systems according to claim 1, characterized in that the IED data collection storage area pre-system comprises: the device comprises a voltage transformer, a current transformer secondary circuit and a secondary equipment alternating current analog acquisition circuit.
5. An online detection method for a substation/distribution automation system according to claim 1, characterised in that the power node comprises: a bus-type power node, a transformer-type power node, and a tie-line-type power node.
CN201910690294.8A 2019-07-29 2019-07-29 Online detection method for substation/distribution automation system Active CN110470928B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910690294.8A CN110470928B (en) 2019-07-29 2019-07-29 Online detection method for substation/distribution automation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910690294.8A CN110470928B (en) 2019-07-29 2019-07-29 Online detection method for substation/distribution automation system

Publications (2)

Publication Number Publication Date
CN110470928A CN110470928A (en) 2019-11-19
CN110470928B true CN110470928B (en) 2021-08-17

Family

ID=68508553

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910690294.8A Active CN110470928B (en) 2019-07-29 2019-07-29 Online detection method for substation/distribution automation system

Country Status (1)

Country Link
CN (1) CN110470928B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112260297B (en) * 2020-10-26 2022-08-26 上海电气分布式能源科技有限公司 Double-bus grid-connected energy storage system management method, device, equipment and medium

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104460346A (en) * 2014-11-18 2015-03-25 江苏省电力公司扬州供电公司 Feeder automation action logic test method based on power distribution terminal service verification
CN104614625A (en) * 2015-02-15 2015-05-13 广州供电局有限公司 Electrified load test method and system of power system
CN105044502A (en) * 2015-07-06 2015-11-11 四川艾德瑞电气有限公司 Secondary measurement abnormity detection method based on power balance for traction substation
CN105116248A (en) * 2015-08-05 2015-12-02 国家电网公司 Automatic closed-loop test method for intelligent transformer station relay protection equipment
CN106771730A (en) * 2016-12-06 2017-05-31 广东电网有限责任公司电力调度控制中心 The intelligent substation real-time calibration equipment of protection device analog quantity sampling circuit and method
CN107819321A (en) * 2017-11-03 2018-03-20 济南历源实业有限责任公司 A kind of power distribution network distribution differential protecting method of on-load switch
CN108982996A (en) * 2018-06-29 2018-12-11 国网江苏省电力有限公司电力科学研究院 A kind of extra-high voltage direct-current of outdoor scene substituted keeps the scene intact test device
CN109103910A (en) * 2018-09-27 2018-12-28 云南电网有限责任公司临沧供电局 A kind of unbalanced control system of low-voltage network three phases active power and method
CN109655681A (en) * 2018-10-30 2019-04-19 北京天能继保电力科技有限公司 A kind of substation and switchyard double measurement circuit method for detecting abnormality and system
CN109900994A (en) * 2019-03-29 2019-06-18 国网重庆市电力公司市区供电分公司 Intelligent substation secondary circuit comprehensive performance testing system and working method

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104460346A (en) * 2014-11-18 2015-03-25 江苏省电力公司扬州供电公司 Feeder automation action logic test method based on power distribution terminal service verification
CN104614625A (en) * 2015-02-15 2015-05-13 广州供电局有限公司 Electrified load test method and system of power system
CN105044502A (en) * 2015-07-06 2015-11-11 四川艾德瑞电气有限公司 Secondary measurement abnormity detection method based on power balance for traction substation
CN105116248A (en) * 2015-08-05 2015-12-02 国家电网公司 Automatic closed-loop test method for intelligent transformer station relay protection equipment
CN106771730A (en) * 2016-12-06 2017-05-31 广东电网有限责任公司电力调度控制中心 The intelligent substation real-time calibration equipment of protection device analog quantity sampling circuit and method
CN107819321A (en) * 2017-11-03 2018-03-20 济南历源实业有限责任公司 A kind of power distribution network distribution differential protecting method of on-load switch
CN108982996A (en) * 2018-06-29 2018-12-11 国网江苏省电力有限公司电力科学研究院 A kind of extra-high voltage direct-current of outdoor scene substituted keeps the scene intact test device
CN109103910A (en) * 2018-09-27 2018-12-28 云南电网有限责任公司临沧供电局 A kind of unbalanced control system of low-voltage network three phases active power and method
CN109655681A (en) * 2018-10-30 2019-04-19 北京天能继保电力科技有限公司 A kind of substation and switchyard double measurement circuit method for detecting abnormality and system
CN109900994A (en) * 2019-03-29 2019-06-18 国网重庆市电力公司市区供电分公司 Intelligent substation secondary circuit comprehensive performance testing system and working method

Also Published As

Publication number Publication date
CN110470928A (en) 2019-11-19

Similar Documents

Publication Publication Date Title
US9166407B2 (en) Implementing substation automation load transfer function
Rahman et al. Multi-agent based coordinated protection systems for distribution feeder fault diagnosis and reconfiguration
CN113364120B (en) Method, device and equipment for checking control process of intelligent substation and storage medium
CN110470928B (en) Online detection method for substation/distribution automation system
Wan et al. Multi‐agent application of substation protection coordination with distributed generators
Zamani et al. Topology processing in distribution systems by branch current based state estimation
CN113608125A (en) Battery fault identification method and device
CN113361065A (en) Determination of the reliability state of an electrical network
CN107102633A (en) A kind of distribution terminal fault self-diagnosis method and system
Dolezilek Case study of a large transmission and distribution substation automation project
Calderaro et al. A Petri net based protection monitoring system for distribution networks with distributed generation
Altaher et al. Reliability investigation of digital substation networks design using fmea technique
CN115693649A (en) Distribution network loop closing power supply switching calculation method and device
CN111751655B (en) Fault self-healing method and device for distribution line, computer equipment and storage medium
CN114172271A (en) Intelligent alarm testing method, system and equipment for online monitoring control function of master station
Liu et al. Risk assessment of a generator rejection scheme implemented in a wind farm
CN110994570A (en) Power distribution network protection method and system, protection equipment and storage medium
Zhu et al. Reliability evaluation of security and stability control device based on Monte Carlo and Fault Tree method
Younis Reliability study for process bus based substation considering various practical process bus architectures
CN117335578B (en) Detection and regulation system for loop closing power conversion of low-voltage power distribution
CN116626540B (en) Method, system, terminal and storage medium for judging broken line fault interval
CN110470938B (en) Online detection method for substation/distribution automation system
WO2023135968A1 (en) Plant monitoring system and plant monitoring device
Nordzi et al. Real Time Electrical Transient Analyzer Program (ETAP RT) Improvement for Gas Processing & Utilities (GPU) plant, PETRONAS Gas Berhad
Peng et al. Reliability assessment of distribution automation based on IEC 61850

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant