CN108548990B - Power restoration strategy recommendation method based on power grid fault behavior analysis - Google Patents
Power restoration strategy recommendation method based on power grid fault behavior analysis Download PDFInfo
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- CN108548990B CN108548990B CN201810297269.9A CN201810297269A CN108548990B CN 108548990 B CN108548990 B CN 108548990B CN 201810297269 A CN201810297269 A CN 201810297269A CN 108548990 B CN108548990 B CN 108548990B
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a power restoration strategy recommendation method based on power grid fault behavior analysis. The method and the device realize quick and accurate judgment of the power grid fault property, and provide reliable technical support for power grid dispatching operators to position the power grid fault reason in time and whether to recover power.
Description
Technical Field
The invention belongs to the technical field of intelligent analysis and control of power systems, and particularly relates to a power restoration strategy recommendation method based on power grid fault behavior analysis.
Background
At present, under the condition of a power grid fault, a signal protection system primarily judges the nature of the fault primarily through remote signaling displacement information, SOE data, protection action signals and fault brief reports, and often cannot accurately judge the fault phase and coincidence condition of a line based on the data, so that an effective auxiliary decision cannot be provided for power restoration of a power grid.
Therefore, a power restoration strategy recommendation method needs to be researched, a reliable power restoration strategy is provided for scheduling, effective fault-caused strong power transmission is carried out on a fault line, rapid power restoration of a power grid is realized, loss of a power supply load is saved, and safety of the power grid is guaranteed.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a power restoration strategy recommendation method based on power grid fault behavior analysis.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows: a power restoration strategy recommendation method based on power grid fault behavior analysis comprises the following steps:
(1) modeling an analog quantity channel for protecting wave recording;
(2) after the power grid fails, receiving remote signaling deflection, SOE and protection action signals, and quickly judging a fault line;
(3) automatically calling a protection wave recording file associated with the fault line;
(4) determining a fault phase according to the protection wave recording file record;
(5) determining a fault phase, namely determining the fault property by combining remote signaling deflection, SOE and a protection action signal;
(6) and giving out a scheduling power restoration strategy suggestion according to the fault property and the forced delivery rule.
The step (4) comprises the following steps:
(4.1) determining a specific fault moment and corresponding fault equipment according to the phase current break variable recorded by the protection recording file, and further determining an analog quantity channel of the fault equipment;
(4.2) calculating the complex values of the analog quantities before and after the fault by applying a differential Fourier series algorithm to the discrete sampling points of the cycle before the fault and the cycle after the fault based on the determined fault time and the analog quantity channel;
and (4.3) calculating the positive sequence current value, the negative sequence current value and the zero sequence current value after the fault through phase sequence conversion, and determining the fault phase by comparing and analyzing the fault components of the sequence current.
The analog quantity channels comprise 8 analog quantity channels of three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current.
Has the advantages that: according to the power grid fault behavior analysis-based power restoration strategy recommendation method, the fault property is accurately determined according to the recording file, the remote signaling deflection, the SOE and the protection action signal, and reliable power restoration strategy recommendations are provided for power grid dispatching operators through the fault property and the strong power transmission rule, so that the rapid power restoration of a power grid is realized, and the operation safety of the power grid is guaranteed.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a logic diagram of the method of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the method for suggesting a power restoration strategy based on the analysis of the grid fault behavior includes the following steps:
s1, modeling an analog quantity channel for protecting wave recording before the power grid fails;
s2, after the power grid fails, receiving remote signaling deflection, SOE and protection action signals, and quickly judging a fault line;
s3, automatically calling a protection wave recording file associated with the fault line;
s4, determining specific fault time and corresponding fault equipment according to the phase current break variable recorded by the protection wave recording file, and further determining 8 analog quantity channels of the fault equipment, namely three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current;
s5, calculating complex values of three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current before and after the fault by applying a differential Fourier series algorithm to discrete sampling points of one cycle before the fault and one cycle after the fault based on the determined fault time and 8 analog quantity channels;
s6, calculating positive sequence, negative sequence and zero sequence current values after the fault through phase sequence conversion, and determining the fault phase by comparing and analyzing the fault components of the sequence current;
s7, determining fault phase, and determining fault property by combining remote signaling deflection, SOE and protection action signals;
and S8, giving a dispatching power restoration strategy suggestion according to the fault property and the forced delivery rule.
As shown in fig. 2, in the specific implementation process, the specific process of giving the scheduling power restoration policy recommendation according to the fault property and the forced delivery rule is as follows:
s1, judging whether the line is a single-phase fault according to the wave recording file, if so, executing a step s2, otherwise, executing a step s 3;
s2, judging whether the circuit has history faults, if yes, executing a step s4, otherwise, executing a step s 5;
s3, judging whether a reclosing action signal exists, if so, judging the fault property, otherwise, executing a step s 6;
s4, judging whether the last fault is a single-phase fault, if so, executing a step s7, otherwise, judging the nature of the fault;
s5, whether the integrated intelligent alarm module judges whether the line is an instantaneous fault or a permanent fault, if so, executing a step s8, otherwise, executing a step s 9;
s6, judging whether three hops are direct or not, if so, executing a step s10, otherwise, judging the fault property;
s7, judging whether a reclosing action signal exists, if so, executing a step s11, otherwise, executing a step s 12;
s8, judging whether the line is instantaneous fault by the comprehensive intelligent alarm module, if so, judging that the line is general instantaneous fault, otherwise, judging that the line is general single-phase permanent fault, and forcibly sending the fault once in a short time in principle;
s9, judging whether an SOE signal exists, if so, executing a step s13, otherwise, executing a step s 14;
s10, judging whether historical faults exist, if so, executing a step s15, otherwise, executing a step s 16;
s11, judging whether the fault is a permanent fault, if so, executing a step s17, otherwise, judging the nature of the fault;
s12, judging whether three hops are direct or not, if so, executing a step s18, otherwise, judging the fault property;
s13, judging whether the state of the last SOE signal of the switch is closed, if so, judging that the line is in a general instantaneous fault, otherwise, judging that the line is in a general single-phase permanent fault, and forcibly sending the signal once in a short time in principle;
s14, judging whether the electrified result of the fault equipment can be obtained through analysis, if so, executing a step s19, otherwise, executing a step s 20;
s15, judging whether the last fault is a single-phase fault, if so, executing a step s21, otherwise, executing a step s 22;
s16, judging whether forced transmission is carried out within 30s before the fault, if so, judging the fault property, otherwise, judging the line is an interphase (multiphase) fault, generally not carrying out forced transmission, and if the line is important, trying to carry out forced transmission once;
s17, judging whether the logic of strong power transmission success is met, if yes, executing a step s23, otherwise, judging the fault property;
s18, judging whether a low-pressure blocking reclosing signal occurs, if so, judging that the line is a three-hop line after a single-phase transient fault (low-pressure blocking) and can be sent forcibly, otherwise, executing a step s 24;
s19, judging whether the line is electrified, if so, judging that the line is a general instantaneous fault, otherwise, judging that the line is a general single-phase permanent fault, and forcibly sending the fault once in a short time in principle;
s20, judging whether a reclosing action signal exists, if so, executing a step s25, otherwise, executing a step s 26;
s21, judging whether the logic accords with the forced power transmission failure logic, if so, forcibly transmitting the line to a multi-phase fault after the line is a single-phase permanent fault, and if not, executing a step s 22;
s22, judging whether the time difference between the current fault and the previous fault is more than 30 seconds, if so, executing a step s16, otherwise, judging the fault property;
s23, judging whether the fault is a homonymy fault, if so, forcibly sending the fault after the circuit is a single-phase permanent fault, if not, forcibly sending the fault in a short time, otherwise, forcibly sending the fault once in a short time, if not, forcibly sending the fault after the circuit is a single-phase permanent fault, and if not, forcibly sending the fault once in a short time;
s24, judging whether the time difference from the last fault is less than 15 seconds, if so, executing a step s27, otherwise, executing a step s 28;
s25, judging whether an action signal appears after the fault is detected, if so, the line is a general single-phase permanent fault, and if not, the line can be forcibly sent once in a short time, otherwise, the line is a general transient fault;
s26, judging whether three jumps are directly carried out, if so, the line is a common single-phase permanent fault and can be forcibly sent once in principle in a short time, otherwise, the line is a single-phase conversion fault and the line can try to forcibly send once;
s27, judging whether the logic accords with the logic of strong power transmission success, if so, after the line is subjected to multiple same-name-phase transient faults (not fully charged) after the line is subjected to strong power transmission success, trying to perform strong power transmission because the line is subjected to multiple three-hop after the same-name-phase transient faults (not fully charged) caused by the fact that reclosing charging is not full and the like does not damage switching factors, otherwise, after the line is subjected to multiple single-phase transient faults (not fully charged) in a short time, performing strong power transmission on the line with the single-phase grounding fault and directly subjected to three-hop due to reclosing charging;
s28, judging whether the logic accords with the strong power transmission failure logic, if so, executing a step s29, otherwise, judging the fault property;
s29, judging whether the fault is a homonymy fault, if so, forcibly sending the fault to the monophase homonymy phase permanent fault after the line is the monophase permanent fault, and not being suitable for forcibly sending the fault in a short time, otherwise, forcibly sending the fault to the monophase heteronymy phase permanent fault after the line is the monophase permanent fault, and forcibly sending the fault once in a short time.
Claims (1)
1. A power restoration strategy recommendation method based on power grid fault behavior analysis is characterized by comprising the following steps: the method comprises the following steps:
(1) modeling an analog quantity channel for protecting wave recording; the analog quantity channels comprise 8 analog quantity channels of three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current;
(2) after the power grid fails, receiving remote signaling deflection, SOE and protection action signals, and quickly judging a fault line;
(3) automatically calling a protection wave recording file associated with the fault line;
(4) determining a fault phase according to the protection wave recording file record;
determining specific fault time and corresponding fault equipment according to the phase current break variable recorded by the protection recording file, and further determining an analog quantity channel of the fault equipment; based on the determined fault time and the analog quantity channel, calculating the complex values of the analog quantity before and after the fault by applying a differential Fourier series algorithm to the discrete sampling points of the cycle before the fault and the cycle after the fault; calculating positive sequence, negative sequence and zero sequence current values after the fault through phase sequence conversion, and determining the fault phase through comparison and analysis of fault components of the sequence current;
(5) determining a fault phase, namely determining the fault property by combining remote signaling deflection, SOE and a protection action signal;
(6) giving a scheduling power restoration strategy suggestion according to the fault property and the forced delivery rule;
the method specifically comprises the following steps:
s1, judging whether the line is a single-phase fault according to the wave recording file, if so, executing a step s2, otherwise, executing a step s 3;
s2, judging whether the circuit has history faults, if yes, executing a step s4, otherwise, executing a step s 5;
s3, judging whether a reclosing action signal exists, if so, judging the fault property, otherwise, executing a step s 6;
s4, judging whether the last fault is a single-phase fault, if so, executing a step s7, otherwise, judging the nature of the fault;
s5, whether the integrated intelligent alarm module judges whether the line is an instantaneous fault or a permanent fault, if so, executing a step s8, otherwise, executing a step s 9;
s6, judging whether three hops are direct or not, if so, executing a step s10, otherwise, judging the fault property;
s7, judging whether a reclosing action signal exists, if so, executing a step s11, otherwise, executing a step s 12;
s8, judging whether the line is instantaneous fault by the comprehensive intelligent alarm module, if so, judging that the line is general instantaneous fault, otherwise, judging that the line is general single-phase permanent fault, and forcibly sending the fault once in a short time in principle;
s9, judging whether an SOE signal exists, if so, executing a step s13, otherwise, executing a step s 14;
s10, judging whether historical faults exist, if so, executing a step s15, otherwise, executing a step s 16;
s11, judging whether the fault is a permanent fault, if so, executing a step s17, otherwise, judging the nature of the fault;
s12, judging whether three hops are direct or not, if so, executing a step s18, otherwise, judging the fault property;
s13, judging whether the state of the last SOE signal of the switch is closed, if so, judging that the line is in a general instantaneous fault, otherwise, judging that the line is in a general single-phase permanent fault, and forcibly sending the signal once in a short time in principle;
s14, judging whether the electrified result of the fault equipment can be obtained through analysis, if so, executing a step s19, otherwise, executing a step s 20;
s15, judging whether the last fault is a single-phase fault, if so, executing a step s21, otherwise, executing a step s 22;
s16, judging whether forced transmission is carried out within 30s before the fault, if yes, judging the fault property, otherwise, judging that the line is an inter-phase fault;
s17, judging whether the logic of strong power transmission success is met, if yes, executing a step s23, otherwise, judging the fault property;
s18, judging whether a low-pressure locking reclosing signal occurs, if so, judging that the line is a line with three hops after a single-phase transient fault, and carrying out forced transmission, otherwise, executing a step s 24;
s19, judging whether the line is electrified, if so, judging that the line is a general instantaneous fault, otherwise, judging that the line is a general single-phase permanent fault, and forcibly sending the fault once in a short time in principle;
s20, judging whether a reclosing action signal exists, if so, executing a step s25, otherwise, executing a step s 26;
s21, judging whether the logic accords with the forced power transmission failure logic, if so, forcibly transmitting the line to a multi-phase fault after the line is a single-phase permanent fault, and if not, executing a step s 22;
s22, judging whether the time difference between the current fault and the previous fault is more than 30 seconds, if so, executing a step s16, otherwise, judging the fault property;
s23, judging whether the fault is a homonymy fault, if so, forcibly sending the fault after the circuit is a single-phase permanent fault, if not, forcibly sending the fault in a short time, otherwise, forcibly sending the fault once in a short time, if not, forcibly sending the fault after the circuit is a single-phase permanent fault, and if not, forcibly sending the fault once in a short time;
s24, judging whether the time difference from the last fault is less than 15 seconds, if so, executing a step s27, otherwise, executing a step s 28;
s25, judging whether an action signal appears after the fault is detected, if so, the line is a general single-phase permanent fault, and if not, the line can be forcibly sent once in a short time, otherwise, the line is a general transient fault;
s26, judging whether three jumps are directly carried out, if so, the line is a common single-phase permanent fault and can be forcibly sent once in principle in a short time, otherwise, the line is a single-phase conversion fault and the line can try to forcibly send once;
s27, judging whether the logic accords with the logic of strong power transmission success, if so, judging that the line is three-hop after multiple same-name-phase instantaneous faults occur after the line is successfully transmitted after single-phase permanent faults, and trying to transmit strongly due to three-hop caused by incomplete reclosing charging, otherwise, judging that the line is three-hop after multiple single-phase instantaneous faults in a short time, and carrying out strong transmission on the line with the single-phase earth faults directly three-hop due to reclosing charging;
s28, judging whether the logic accords with the strong power transmission failure logic, if so, executing a step s29, otherwise, judging the fault property;
s29, judging whether the fault is a homonymy fault, if so, forcibly sending the fault to the monophase homonymy phase permanent fault after the line is the monophase permanent fault, and not being suitable for forcibly sending the fault in a short time, otherwise, forcibly sending the fault to the monophase heteronymy phase permanent fault after the line is the monophase permanent fault, and forcibly sending the fault once in a short time.
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| CN110531223A (en) * | 2019-10-14 | 2019-12-03 | 国网山东省电力公司莱芜供电公司 | A kind of 35kV line fault positioning quick calculation method based on scheduling application, equipment and readable storage medium storing program for executing |
| CN113325333A (en) * | 2021-05-14 | 2021-08-31 | 青岛鼎信通讯股份有限公司 | Small current grounding system disconnection detection method suitable for fault indicator |
| CN113435690A (en) * | 2021-05-14 | 2021-09-24 | 北京四方继保工程技术有限公司 | Line forced transmission auxiliary decision-making method based on protection information deep mining |
| CN113408210B (en) * | 2021-07-12 | 2023-08-01 | 内蒙古电力(集团)有限责任公司乌兰察布供电分公司 | Deep learning-based non-invasive load decomposition method, system, medium and equipment |
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| CN103809078B (en) * | 2014-01-26 | 2016-04-20 | 浙江大学 | The single-phase permanent fault recognition methods of a kind of both-end band shunt reactor transmission line of electricity |
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