CN111865669A - Intelligent decision making system and method for power grid fault recovery - Google Patents
Intelligent decision making system and method for power grid fault recovery Download PDFInfo
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Abstract
The invention provides an intelligent decision-making system and method for power grid fault recovery, wherein the system comprises a power grid fault recovery auxiliary decision-making system, an EMS system and a fault recording system; the power grid accident recovery auxiliary decision making system calls power grid equipment parameters, respectively interacts with real-time data of the EMS system and the fault recording system, compares the real-time data with a fault criterion information base, and realizes and outputs a fault processing auxiliary decision; the EMS system integrates a real-time structure of a power grid and a dispatcher power flow analysis result; and the fault recording system determines the fault reason of the power grid and the distance between the fault point and the transformer substation. Based on the system, the invention also provides an intelligent decision-making method for power grid fault recovery, which effectively avoids the overload condition of the line and the main transformer brought in the process of handling the accident, improves the stability of the power grid in the N-1 state, improves the intelligent level of power grid fault handling, and lightens the working intensity of the regulating and controlling personnel.
Description
Technical Field
The invention belongs to the technical field of power grid fault recovery, and particularly relates to an intelligent decision-making system and method for power grid fault recovery.
Background
The power grid faults mainly comprise power transmission line faults, bus faults, main transformer faults and the like, after the power grid faults, the operation mode and the power flow of the power grid are greatly changed, a duty dispatcher needs to comprehensively consider the fault information and the action conditions of a protection device and a self-installation device, and quickly make a recovery scheme, particularly during the summer time of meeting the peak and the winter time, after the power grid has N-1 faults, the heavy overload phenomenon easily occurs, and the power grid power flow distribution needs to be adjusted as soon as possible, so that the power grid structure is prevented from being damaged to a greater extent. And judging whether the power transmission line can be forcibly sent according to the action condition of the protection device and the fault distance measurement information for the power transmission line fault treatment scheme. According to the regulation, the following cannot be forced: the fault point is at the cable section, the trip of the switch of the line transformer bank, the trial run line, the live working of the line, the obvious fault symbol found, the three-phase fault of the line and other lines which can not be forcibly sent by clear regulation; if the forced sending can be carried out, a decision scheme is formed: the method includes the steps that a dispatcher is recommended to send the power to the power grid once, and the power grid recovers an original operation mode after the power is successfully sent; if the forced delivery cannot be carried out or fails, comprehensively analyzing the spare power switching action condition and the load loss condition to form a decision scheme: the method comprises the steps of firstly, recovering a detailed list of power supply loss by a standby power supply, secondly, generating a heavy overload and single power station report list by virtue of an EMS system by a substation which is successfully switched into a standby mode, and providing a heavy overload line adjusting scheme. Analyzing the loss load condition and the spare power switching action condition according to the protection action condition for the bus fault processing scheme; restoring power supply to the loss load by the standby power supply; and analyzing the overload conditions of the lines and the main transformers for the plant station of the backup power switching action to form an adjusting scheme. Analyzing the loss load condition and the spare power switching action condition according to the protection action condition for the main transformer fault disposal scheme; restoring power supply to the loss load by the standby power supply; and analyzing the overload conditions of the lines and the main transformers for the plant station of the backup power switching action to form an adjusting scheme.
In the traditional processing method, after the power grid fails, a duty dispatcher must comprehensively analyze various information such as protection action conditions, fault recording and ranging results, grid structure, line and main transformer overload conditions, the working strength is high, a complete recovery scheme is difficult to make in a short time, and particularly, new risk points are easily brought to the power grid in summer and winter with heavy load. After the power grid fails, protective equipment such as a relay protection device, a standby power supply automatic switching device and an automatic safety device act in sequence, the operation mode, the power flow distribution and the bus voltage of the power grid change greatly, and the risk point of the power grid operation is increased. The traditional processing method relies on manual experience analysis, has long judgment time, high labor intensity and low working efficiency, easily omits risk points in the face of more and more complex grid structures, and reduces the steady-state and transient stability of the power grid.
Disclosure of Invention
The invention provides an intelligent decision-making system and method for power grid fault recovery, which can autonomously judge the type of a power grid fault and provide a decision-making scheme for fault processing and power recovery according to protection and installation information.
In order to achieve the purpose, the invention provides an intelligent decision-making system for power grid fault recovery, which comprises an auxiliary decision-making system for power grid fault recovery, an EMS system and a fault recording system;
The power grid accident recovery auxiliary decision making system respectively carries out real-time data interaction with the EMS system and the fault recording system by calling power grid equipment parameters and compares the power grid equipment parameters with the fault criterion information base of the power transmission line to realize and output a fault processing auxiliary decision;
the EMS system integrates the real-time structure of the power grid, the action information of a post-fault power protection device, the action condition of reclosing, the fault phase, the action condition of backup switching, an automatic safety device, the action condition of a low-frequency low-voltage device and the flow analysis result of a dispatcher;
the fault recording system generates an accident report text by collecting real-time current waveforms, and determines the fault reason of the power grid and the distance between a fault point and a transformer substation.
Further, the power grid accident recovery aid decision-making system is in communication connection with the EMS system; and the power grid accident recovery auxiliary decision making system is in communication connection with the fault recording system.
Furthermore, the power grid accident recovery aid decision making system comprises an intelligent system main station, a power grid equipment parameter base, a criterion information base, an information interaction mechanism and an aid decision making output unit;
the intelligent system master station realizes the logic judgment of the power grid fault by calling the power grid equipment parameters, the EMS system data and the fault recording system data and comparing the parameters with the power transmission line fault criterion information base;
The power grid equipment parameter library comprises the type of a transmission line conductor, the size of a current limiting element, the length of the conductor and the main transformer capacity;
the criterion information base comprises a transmission line fault forced transmission condition, whether heavy overload equipment exists or not in an N-1 state after the fault, and whether a single power station exists or not;
the information interaction mechanism is used for realizing information interaction between the intelligent system master station and the EMS system as well as between the intelligent system master station and the fault recording system;
and the auxiliary decision output unit is used for outputting a fault processing auxiliary decision.
Furthermore, the intelligent system master station is respectively in communication connection with the power grid equipment parameter base, the criterion information base, the information interaction mechanism and the auxiliary decision output unit.
Further, the transmission line fault forced transmission condition includes whether a fault point is located in a cable section, whether the fault point is a three-phase fault, whether the fault point is a test run line, and whether the fault point is a line-to-line group connection.
Furthermore, the dispatcher power flow analysis result comprises a power grid power flow distribution result after the fault and a power flow result adjusted according to the generated assistant decision scheme.
Based on the intelligent decision-making system for power grid fault recovery provided by the invention, an intelligent decision-making method for power grid fault recovery is also provided, and the method comprises the following steps:
S1: calling an EMS system and a fault recording system to carry out real-time data interaction, and acquiring an accident report text;
s2: comparing the accident report text with a transmission line fault criterion information base to judge fault types, wherein the fault types comprise a bus, a main transformer fault and a line fault;
s3: calling an EMS real-time power grid structure, a spare power switching action condition and a dispatcher load flow calculation result for bus, main transformer faults and line faults which are not forcibly transmitted, and forming a detailed list of loss load conditions after faults and heavy overload equipment in a power grid; and calling backup switching action information for the line fault of forced transmission, and generating a power grid recovery scheme after the line is successfully forced transmission by default.
Further, before the step S1 is executed, the total accident signal and the line switch displacement signal transmitted by the EMS system are received.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the embodiment of the invention provides an intelligent decision-making system and method for power grid fault recovery, wherein the system comprises a power grid fault recovery auxiliary decision-making system, an EMS system and a fault recording system; the power grid accident recovery auxiliary decision making system respectively carries out real-time data interaction with the EMS system and the fault recording system by calling power grid equipment parameters and compares the power grid equipment parameters with the fault criterion information base of the power transmission line to realize and output a fault processing auxiliary decision; the EMS system integrates the real-time structure of the power grid, the action information of the subsequent power protection device after the fault, the action condition of reclosing, the fault phase, the action condition of backup power switching, the action condition of an automatic safety device, the action condition of a low-frequency low-voltage device and the flow analysis result of a dispatcher; the fault recording system generates an accident report text by collecting real-time current waveforms, and determines the fault reason of the power grid and the distance between a fault point and a transformer substation. Based on the power grid fault recovery intelligent decision system provided by the invention, a power grid fault recovery intelligent decision method is also provided. The invention establishes a power grid equipment parameter library, wherein the power grid equipment parameter library comprises a criterion information library including line types, current limiting, main transformer capacity and the like, and performs real-time data interaction with an EMS system and a fault recording system, after a power grid fault occurs, an analysis system is started by an accident total signal and a switch deflection signal, information such as a power grid real-time structure, protection, backup switching, the action condition of an automatic installation device, a dispatcher power flow analysis result and the like is integrated at a master station end of an intelligent system, a fault processing auxiliary decision is formed according to the rule conditions of the criterion information library, and a decision scheme and a calculation result are output by an auxiliary decision output unit. The method is automatically completed through the analysis system at the intelligent system main station end, does not need human intervention, has high speed, can complete the power grid fault analysis within a few minutes, forms an accident handling assistant decision scheme, and provides the fault handling efficiency. By means of the EMS dispatcher tide analysis structure, the overload condition of lines and main transformer weight brought in the accident handling process is effectively avoided, and the stability of the power grid in the N-1 state is improved. The intelligent level of grid fault treatment is improved, and the working intensity of regulating and controlling personnel is effectively reduced.
Drawings
Fig. 1 shows a diagram of an intelligent decision-making system for grid fault recovery according to embodiment 1 of the present invention;
fig. 2 shows a flowchart of an intelligent decision-making method for grid fault recovery according to embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
Embodiment 1 of the present invention provides an intelligent decision-making system for grid fault recovery, and for example, fig. 1 shows a diagram of an intelligent decision-making system for grid fault recovery in embodiment 1 of the present invention. The system comprises a power grid accident recovery aid decision-making system, an EMS system and a fault recording system.
The power grid accident recovery aid decision making system respectively carries out real-time data interaction with the EMS system and the fault recording system by calling power grid equipment parameters and compares the power grid equipment parameters with the fault criterion information base of the power transmission line to realize and output a fault processing aid decision.
The EMS system is an energy management system, has data acquisition and monitoring capabilities and simultaneously has a dispatcher power flow analysis module. Integrating the real-time structure of the power grid, the action information of a post-fault power protection device, the action condition of a reclosing switch, the fault phase, the action condition of a backup power supply switch, an automatic safety device, the action condition of a low-frequency low-voltage device and the flow analysis result of a dispatcher; the dispatcher load flow analysis result comprises the following steps: and the power grid power flow distribution result after the fault and the power flow result after the adjustment according to the generated auxiliary decision scheme.
The fault recording system generates an accident report text by collecting real-time current waveforms, and determines the fault reason of the power grid and the distance between a fault point and a transformer substation.
The power grid accident recovery auxiliary decision making system is in communication connection with the EMS system; and the power grid accident recovery auxiliary decision making system is in communication connection with the fault recording system.
The power grid accident recovery auxiliary decision system comprises an intelligent system main station, a power grid equipment parameter base, a criterion information base, an information interaction mechanism and an auxiliary decision output unit; the intelligent system master station realizes the logic judgment of the power grid fault by calling the power grid equipment parameters, the EMS system data and the fault recording system data and comparing the parameters with the power transmission line fault criterion information base; the power grid equipment parameter library comprises the type of a transmission line conductor, the size of a current limiting element, the length of the conductor and the main transformer capacity; the criterion information base comprises a transmission line fault forced transmission condition, whether heavy overload equipment exists or not in an N-1 state after the fault, and whether a single power station exists or not; the information interaction mechanism is used for realizing the information interaction between the intelligent system master station and the EMS system as well as the fault recording system; because the EMS system and the fault recording system are different in building platform and different in information message uploading, the information interaction mechanism is used for solving the problem of information interaction between the EMS system and the fault recording system, and converting different messages into information required by the system, thereby realizing the reading and calling of the real-time information of the power grid equipment. And the auxiliary decision output unit is used for outputting the fault processing auxiliary decision.
And the intelligent system master station is respectively in communication connection with the power grid equipment parameter base, the criterion information base, the information interaction mechanism and the auxiliary decision output unit.
The transmission line fault forced transmission condition comprises the steps of judging whether a fault point is located in a cable section or not, judging whether the fault point is a three-phase fault or not, judging whether the fault point is a test run line or not, and judging whether the fault point is a line-to-line group connection or not.
Based on the power grid fault recovery intelligent decision system provided by the invention, a power grid fault recovery intelligent decision method is also provided, and a flow chart of the power grid fault recovery intelligent decision method is provided as shown in fig. 2.
In step S201, the total accident signal and the line switch displacement signal sent by the EMS energy management system are automatically and jointly started by the intelligent system master station program.
In step S202, an analysis program located in the intelligent system master is started.
In step S203, the EMS system and the fault recording system are invoked to perform real-time data interaction, and an accident report text is obtained. The fault recording system can collect real-time current waveforms and generate an accident report file in a comtrade format, wherein the accident report file contains information such as fault equipment types, fault phases, protection device action conditions and fault distance measurement.
In step S204, the system may directly call an accident report file through information interaction, compare the accident report text with the transmission line fault criterion information base to determine the fault type, where the fault type includes a bus fault, a main transformer fault, and a line fault, if the fault type is a bus fault, the main transformer fault executes step S205, and if the fault type is a bus fault, the step S206 is executed.
In step S05, information such as EMS real-time grid structure, backup operation condition, dispatcher load flow calculation result, etc. is called to form a detailed list of the loss load condition after the fault and the heavy overload equipment existing in the grid.
And (3) calling the transformer substation with direct electrical connection from the EMS system according to the power grid topological graph, wherein the transformer substation is most seriously influenced under the general condition, and the power grid topological graph can be stored in a power grid equipment parameter library.
The operation condition of the backup switching device is judged by calling a switch displacement signal sent by the EMS, and if the switch in the position division becomes the closed position after an accident, the backup switching device operates.
The EMS system contains a dispatcher load flow calculation module, the calculation result comprises heavy overload equipment which can be set to recalculate once when an accident total signal is sent, and the result is sent to an analysis system.
In step S206, it is determined whether or not forced transmission is performed. Reasoning and analyzing the fault line condition to determine whether the wiring of the line transformer bank exists; analyzing the fault recording and ranging result and the type of the transmission line conductor, and determining whether a fault point is positioned in a cable section; analyzing the relay protection action information and determining whether the three-phase fault exists. If the three conditions are simultaneously satisfied, a forced sending suggestion is provided; step S209 is executed, otherwise step S207 is executed.
In step S207, a load transfer scheme is proposed for each piece of information according to the generated list. There are currently two ways to retrieve existing equipment heavy overload handling schemes from a database. The database is updated each time an accident plan is written and an equipment overload handling scheme that is not stored is added. And according to the power grid topological graph, retrieving power supply lines in the same transformer substation with one or two voltage levels lower than the fault equipment, and supplying all line loads by another power supply to form a load transfer scheme. Since whether the line is a power-conserving line depends on objective factors such as significant activities, all load transfer schemes are formed for the dispatcher to perform by reference.
In step S208, analysis and judgment results, bases, and related information of the single power plant, the loss load recovery scheme, the heavy overload device power-dispatching strategy, and the like are output through the client and referred to by the dispatcher.
In step S209, the backup operation information is called, and a power grid restoration scheme is generated by default after the line forced transmission is successful, that is, the backup operation condition is returned reversely.
In step S210, the plan basis and the related information for recovering the pre-failure operation mode are output through the client and referred to by the dispatcher.
The present invention has been described in detail with reference to the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments shown and described, but is intended to cover various modifications, additions and substitutions for those skilled in the art.
Claims (8)
1. An intelligent decision-making system for power grid fault recovery is characterized by comprising a power grid fault recovery auxiliary decision-making system, an EMS system and a fault recording system;
the power grid accident recovery auxiliary decision making system respectively carries out real-time data interaction with the EMS system and the fault recording system by calling power grid equipment parameters and compares the power grid equipment parameters with the fault criterion information base of the power transmission line to realize and output a fault processing auxiliary decision;
the EMS system integrates the real-time structure of the power grid, the action information of a post-fault power protection device, the action condition of reclosing, the fault phase, the action condition of backup switching, an automatic safety device, the action condition of a low-frequency low-voltage device and the flow analysis result of a dispatcher;
the fault recording system generates an accident report text by collecting real-time current waveforms, and determines the fault reason of the power grid and the distance between a fault point and a transformer substation.
2. The system according to claim 1, wherein the grid fault recovery aid decision system is in communication connection with an EMS system; and the power grid accident recovery auxiliary decision making system is in communication connection with the fault recording system.
3. The power grid fault recovery intelligent decision system according to claim 1, wherein the power grid fault recovery auxiliary decision system comprises an intelligent system main station, a power grid equipment parameter base, a criterion information base, an information interaction mechanism and an auxiliary decision output unit;
the intelligent system master station realizes the logic judgment of the power grid fault by calling the power grid equipment parameters, the EMS system data and the fault recording system data and comparing the parameters with the power transmission line fault criterion information base;
the power grid equipment parameter library comprises the type of a transmission line conductor, the size of a current limiting element, the length of the conductor and the main transformer capacity;
the criterion information base comprises a transmission line fault forced transmission condition, whether heavy overload equipment exists or not in an N-1 state after the fault, and whether a single power station exists or not;
the information interaction mechanism is used for realizing information interaction between the intelligent system master station and the EMS system as well as between the intelligent system master station and the fault recording system;
And the auxiliary decision output unit is used for outputting a fault processing auxiliary decision.
4. The power grid fault recovery intelligent decision making system as claimed in claim 3, wherein the intelligent system master station is respectively in communication connection with the power grid equipment parameter base, the criterion information base, the information interaction mechanism and the auxiliary decision making output unit.
5. The system according to claim 3, wherein the power grid fault restoration intelligent decision making system is characterized in that the transmission line fault forced transmission condition comprises a judgment of whether a fault point is located in a cable section, a three-phase fault, a trial-run line or a line-to-group connection.
6. The system according to claim 1, wherein the dispatcher power flow analysis result comprises a post-fault power flow distribution result and a power flow result adjusted according to the generated aid decision scheme.
7. An intelligent decision-making method for grid fault recovery is realized based on the intelligent decision-making system for grid fault recovery of any one of claims 1 to 6, and is characterized by comprising the following steps of:
s1: calling an EMS system and a fault recording system to carry out real-time data interaction, and acquiring an accident report text;
S2: comparing the accident report text with a transmission line fault criterion information base to judge fault types, wherein the fault types comprise a bus, a main transformer fault and a line fault;
s3: calling an EMS real-time power grid structure, a spare power switching action condition and a dispatcher load flow calculation result for bus, main transformer faults and line faults which are not forcibly transmitted, and forming a detailed list of loss load conditions after faults and heavy overload equipment in a power grid; and calling backup switching action information for the line fault of forced transmission, and generating a power grid recovery scheme after the line is successfully forced transmission by default.
8. The grid fault recovery intelligent decision method according to claim 7, wherein before executing step S1, a total accident signal and a line switch shift signal sent by the EMS system are received.
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| CN113193549A (en) * | 2021-04-02 | 2021-07-30 | 国网江苏省电力有限公司 | System and method for regulating and controlling transaction perception and fault co-processing |
| 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 |
| CN113472074A (en) * | 2021-06-18 | 2021-10-01 | 国网浙江省电力有限公司金华供电公司 | Intelligent fault handling method and system for intelligent power grid dispatching control system |
| CN113472074B (en) * | 2021-06-18 | 2024-07-30 | 国网浙江省电力有限公司金华供电公司 | Intelligent fault handling method and system for intelligent power grid dispatching control system |
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| CN113193549A (en) * | 2021-04-02 | 2021-07-30 | 国网江苏省电力有限公司 | System and method for regulating and controlling transaction perception and fault co-processing |
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| CN113472074A (en) * | 2021-06-18 | 2021-10-01 | 国网浙江省电力有限公司金华供电公司 | Intelligent fault handling method and system for intelligent power grid dispatching control system |
| CN113472074B (en) * | 2021-06-18 | 2024-07-30 | 国网浙江省电力有限公司金华供电公司 | Intelligent fault handling method and system for intelligent power grid dispatching control system |
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