CN108539740B - Power grid accident forecast simulation system and method thereof - Google Patents
Power grid accident forecast simulation system and method thereof Download PDFInfo
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- CN108539740B CN108539740B CN201810453951.2A CN201810453951A CN108539740B CN 108539740 B CN108539740 B CN 108539740B CN 201810453951 A CN201810453951 A CN 201810453951A CN 108539740 B CN108539740 B CN 108539740B
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- 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
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention relates to a power grid accident prediction simulation system and a method thereof, wherein the system is realized based on a D5000 platform and comprises the following steps: the system comprises a power grid accident prediction simulation subsystem, a safety and stability online management subsystem, an online security check subsystem, a power flow transfer scheme database and a stability control strategy expert system database. The system acquires information required by stability judgment through a stability online management subsystem, constructs a system database of a power flow transfer scheme with various power grid faults through a power grid stability calculation result, performs fault simulation and action result simulation of the stability control device by using current power flow information, the power grid fault power flow transfer scheme and an actual strategy table in the stability control device, and sends the simulated fault and the simulated action result to an online safety check system for safety check. Simulating the possible faults of the network by adopting a power grid accident prediction simulation mode, giving out a corresponding stability control strategy, and sending the result to an online safety analysis computing system for checking; when N-1 accidents and N-2 accidents actually occur, a dispatcher can immediately make a decision to prevent the transmission line from tripping in succession, and the accidents are eliminated in the sprouting period.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a power grid accident prediction simulation system and a power grid accident prediction simulation method.
Background
At present, the national power grid gradually develops from a power distribution network, a regional power grid, a provincial power grid and a trans-provincial power grid to national networking, and North America and Europe form the trans-national networking. The stability and the reliability of the power grids can be improved by the interconnection of the power grids, the power grids can support each other and can be used for each other, but the power grids are easy to influence each other because the power grids are connected into a whole. When an abnormality or a fault occurs at one position in the power grid, a cascading accident often occurs in a weak link of the power grid, so that large-area power failure is caused.
The reasons of major power failure accidents of a large power grid are common power accidents, but compared with a small power grid, the major power grid has stronger accident resistance and higher stability, the frequency and the voltage are kept within the allowable range under most conditions, and continuous power supply can be guaranteed. However, when the power grid has weak links, the power transmission system has no spare capacity, the network structure is unreasonable, and an electromagnetic ring network exists, the power transmission line is easy to have overload and trip in succession, and finally system oscillation and power grid collapse are caused.
Therefore, in order to prevent major power failure accidents, the operation mode and the safety of the power grid are analyzed in time by adopting the power grid simulation system. The existing relay protection and automatic device and automatic monitoring system can not completely meet the requirements of power grid development, the SCADA system collects system steady state information, the EMS only monitors and processes the information provided by the SCADA system, and decision support for scheduling is lacked.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a power grid accident prediction simulation system and a method thereof, wherein a power grid accident prediction simulation mode is adopted to simulate the possible faults of a network and give out a corresponding stability control strategy, and then the result is sent to an online safety analysis computing system for checking; when N-1 accidents and N-2 accidents actually occur, a dispatcher can immediately make a decision to prevent the transmission line from tripping in succession, and the accidents are eliminated in the sprouting period.
The technical scheme for solving the technical problems is as follows:
in one aspect, the invention provides a power grid accident prediction simulation system, which is implemented based on a D5000 platform, and is characterized by comprising: the system comprises a power grid accident prediction simulation subsystem, a safety and stability online management subsystem, an online security check subsystem, a power flow transfer scheme database and a stability control strategy expert system database;
the power grid accident prediction simulation subsystem is used for performing stability judgment on required voltage current and active and reactive power flow information through a stability online management system power grid operation mode and power flow data, and determining an operation object of the simulation system; the accident simulation system is used for simulating accidents of key lines or equipment;
the power flow transfer scheme database is established by analyzing a stable calculation result and is used for storing the power flow transfer scheme;
the stability control strategy expert system database is established through early-stage data query and collection and regional power grid stability calculation results and used for storing known stability control strategies;
and the online safety check subsystem is used for performing safety check on the accident simulation result of the power grid accident prediction simulation subsystem and analyzing whether the existing stability control strategy needs to be modified or not.
Further, the power grid accident forecast simulation subsystem is also connected with the EMS dispatching automation system in a networking mode and is used for receiving real-time data of the EMS, carrying out dynamic security analysis on the power grid forecast accidents and determining a security and stability control strategy.
Further, the power grid accident anticipation simulation subsystem comprises a stability information collection and detection module, a fault simulation analysis module, an intelligent decision module and a result transmission and check module;
the stability information collection and detection module is used for visually presenting the real-time running condition and the load flow information of the current network to a user in a statistical chart form;
the fault simulation analysis module is used for analyzing and determining regional power grid line or equipment information to be simulated according to the requirements, simulating an accident, intelligently analyzing a tide result and an accident influence range after the accident and judging the risk;
the intelligent decision module is used for selecting a strategy table in a stability control strategy expert database under a corresponding operation mode after the simulated accident is analyzed, and providing a stability control strategy of the simulated accident according to a load flow transfer calculation result;
and the result transmission and checking module is used for transmitting the load flow data obtained by analysis and calculation and the stability control strategy, transmitting the result of the simulation system to the online safety checking system in real time, checking whether the stability control strategy is proper or not after actual load flow calculation, and otherwise, providing a new stability control suggestion.
Further, the stability online management subsystem comprises a plurality of regional stability control systems;
the area stable control system is a system which is formed by connecting a safety stable control device arranged at two or more stations for solving the stability problem in a regional power grid, an information channel and communication interface equipment, and comprises: the system comprises a main station and a plurality of sub-stations, wherein the main station and the sub-stations are connected with the plurality of terminal stations through information channels and communication interfaces.
Further, in the present invention,
the main station is arranged in the hub substation or a power plant at the same position as the hub substation, and is used for summarizing the operation condition information of each substation, carrying out state estimation on a regional power grid, identifying the operation mode of the regional power grid, carrying out dynamic safety estimation on the regional power grid according to a given expected accident set, forming a safety and stability control strategy table on line or pre-installing a control strategy table obtained by off-line calculation, and transmitting the relevant operation mode information and the control strategy table to each substation; the system comprises a main station, a terminal station and a plurality of substations, wherein the main station is used for sending control commands to the main station and the substations according to a control strategy table when receiving the faults of the main station and the outgoing lines, and simultaneously transmitting the control commands to the terminal station through the substations;
the substation is arranged in an important transformer substation or a power plant connected with the transformer substation, and is used for acquiring working condition operation information of the substation and transmitting the working condition operation information to the main station; the system comprises a main station, a terminal station, a substation, a control strategy table and a plurality of sub-stations, wherein the main station is used for sending control commands to the main station and the sub-stations according to the control strategy table in the sub-stations when receiving the faults of the main station and outgoing lines of the main station;
the terminal station is used for receiving the control command transmitted by each station, executing local control and transmitting the control result information to the superior station.
Further, when the power flow transfer scheme database and the stability control strategy expert system database are created, the following principles are followed:
(1) canonical nomenclature
All library names, table names and domain names follow a uniform naming rule and are explained as necessary so as to facilitate design, maintenance and query;
(2) reference to control fields
During design, a proper database design management tool is selected to facilitate distributed design of developers and centralized audit management of data groups; adopting a unified naming rule, if the designed field already exists, directly referencing the field; otherwise, redesigning is needed;
(3) bank table repeat control
In the design process, if most fields are found to exist, whether the designed library table exists or not is suspected; whether the library tables are really repeated is confirmed by inquiring the library table where the field is located and corresponding designers;
(4) concurrent control
Concurrent control should be carried out in the design, namely, only one person has control right at the same time and other persons can only carry out inquiry for the same base table.
On the other hand, the invention also provides a power grid accident prediction simulation method based on the system, which comprises the following steps:
step 1, acquiring a power grid operation mode and power flow data through a stability online management system, judging required voltage and current and active and reactive power flow information in a stability mode, and determining an operation object of a simulation system;
step 2, constructing a tide transfer scheme database through analysis of a stable calculation result; constructing a power grid stability control strategy expert system database through the early-stage data query, collection and regional power grid stability calculation results;
step 3, performing accident simulation on the key line or equipment through an accident simulation system, calculating the flow data after the accident according to the flow transfer database, and analyzing the accident influence and the risk; accident simulation results are displayed on a system interface in a chart form, and the heavy load and overload lines respectively represent the power flow data of the heavy load and overload lines by yellow and red numbers;
and 4, calling a stability control strategy expert system database according to the calculation result, transmitting the accident simulation result to an online security check system for security check, and analyzing whether the existing stability control strategy needs to be modified.
The invention has the beneficial effects that: the power grid accident forecast simulation system is an application subsystem constructed on a unified support platform, and completes functions of information archiving, statistical query, intelligent analysis and the like by acquiring basic data of static stability analysis, transient stability analysis, dynamic stability analysis and voltage stability analysis; the method realizes operation monitoring, accident simulation, action result analysis and result communication of the power grid key line by the dispatching center in a normal period, and provides an accurate stable control strategy for dispatching operation personnel and other professionals.
After the accident prediction simulation system simulates the accident, the result is transmitted to the online security check system, the online security check system carries out load flow calculation to check whether the processing result of the simulation system is reliable or not, and finally an optimal stability control strategy is given.
The accident prediction simulation system has the functions of power grid flow analysis and a given accident handling strategy. After the calculation result of the power flow transfer ratio is obtained from the data uploaded by the safety and stability control device, calculation is carried out aiming at the simulated fault condition, and the overloaded line and the overload degree in the fault state can be directly displayed so as to conveniently analyze regional or local power flow and obtain an accident handling strategy. Once the accident model assumed in the plan occurs, people can quickly react and carry out emergency treatment according to the established operation procedures and operation requirements so as to achieve the purpose of reducing accident loss or avoiding accidents.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
FIG. 2 is a block diagram of a zone stability control system according to the present invention;
FIG. 3 is a flow chart of the method of the present invention.
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.
In one aspect, the present invention provides a power grid accident prediction simulation system, which is implemented based on a D5000 platform, as shown in fig. 1, and includes: the system comprises a power grid accident prediction simulation subsystem, a safety and stability online management subsystem, an online security check subsystem, a power flow transfer scheme database and a stability control strategy expert system database;
the power grid accident prediction simulation subsystem is used for performing stability judgment on required voltage current and active and reactive power flow information through a stability online management system power grid operation mode and power flow data, and determining an operation object of the simulation system; the accident simulation system is used for simulating accidents of key lines or equipment;
the power grid accident forecast simulation subsystem is also connected with the EMS dispatching automation system in a networking mode and is used for receiving real-time data of the EMS, carrying out dynamic safety analysis on the power grid forecast accidents and determining a safety and stability control strategy.
The power grid accident prediction simulation subsystem comprises a stability information collection and detection module, a fault simulation analysis module, an intelligent decision module and a result transmission and check module;
the stability information collection and detection module is used for visually presenting the real-time running condition and the load flow information of the current network to a user in a statistical chart form;
the fault simulation analysis module is used for analyzing and determining regional power grid line or equipment information to be simulated according to the requirements, simulating an accident, intelligently analyzing a tide result and an accident influence range after the accident and judging the risk;
the intelligent decision module is used for selecting a strategy table in a stability control strategy expert database under a corresponding operation mode after the simulated accident is analyzed, and providing a stability control strategy of the simulated accident according to a load flow transfer calculation result;
and the result transmission and checking module is used for transmitting the load flow data obtained by analysis and calculation and the stability control strategy, transmitting the result of the simulation system to the online safety checking system in real time, checking whether the stability control strategy is proper or not after actual load flow calculation, and otherwise, providing a new stability control suggestion.
The stability online management subsystem comprises a plurality of regional stability control systems;
the regional stability control system is a system formed by connecting two or more plant stations by an information channel and a communication interface device, in order to solve the stability problem in a regional power grid, and as shown in fig. 2, the system comprises: the system comprises a main station and a plurality of sub-stations, wherein the main station and the sub-stations are connected with the plurality of terminal stations through information channels and communication interfaces.
The main station is arranged in the hub substation or a power plant at the same position as the hub substation, and is used for summarizing the operation condition information of each substation, carrying out state estimation on a regional power grid, identifying the operation mode of the regional power grid, carrying out dynamic safety estimation on the regional power grid according to a given expected accident set, forming a safety and stability control strategy table on line or pre-installing a control strategy table obtained by off-line calculation, and transmitting the relevant operation mode information and the control strategy table to each substation; the system comprises a main station, a terminal station and a plurality of substations, wherein the main station is used for sending control commands to the main station and the substations according to a control strategy table when receiving the faults of the main station and the outgoing lines, and simultaneously transmitting the control commands to the terminal station through the substations;
the substation is arranged in an important transformer substation or a power plant connected with the transformer substation, and is used for acquiring working condition operation information of the substation and transmitting the working condition operation information to the main station; the system comprises a main station, a terminal station, a substation, a control strategy table and a plurality of sub-stations, wherein the main station is used for sending control commands to the main station and the sub-stations according to the control strategy table in the sub-stations when receiving the faults of the main station and outgoing lines of the main station;
the terminal station is used for receiving the control command transmitted by each station, executing local control and transmitting the control result information to the superior station.
The power flow transfer scheme database is established by analyzing a stable calculation result and is used for storing the power flow transfer scheme; the stability control strategy expert system database is established through early-stage data query and collection and regional power grid stability calculation results and used for storing known stability control strategies;
when the power flow transfer scheme database and the stability control strategy expert system database are created, the following principles are followed:
(1) canonical nomenclature
All library names, table names and domain names follow a uniform naming rule and are explained as necessary so as to facilitate design, maintenance and query;
(2) reference to control fields
During design, a proper database design management tool is selected to facilitate distributed design of developers and centralized audit management of data groups; adopting a unified naming rule, if the designed field already exists, directly referencing the field; otherwise, redesigning is needed;
(3) bank table repeat control
In the design process, if most fields are found to exist, whether the designed library table exists or not is suspected; whether the library tables are really repeated is confirmed by inquiring the library table where the field is located and corresponding designers;
(4) concurrent control
Concurrent control should be carried out in the design, namely, only one person has control right at the same time and other persons can only carry out inquiry for the same base table.
And the online safety check subsystem is used for performing safety check on the accident simulation result of the power grid accident prediction simulation subsystem and analyzing whether the existing stability control strategy needs to be modified or not.
On the other hand, the invention further provides a power grid accident prediction simulation method based on the system, as shown in fig. 3, including the following steps:
step 1, acquiring a power grid operation mode and power flow data through a stability online management system, judging required voltage and current and active and reactive power flow information in a stability mode, and determining an operation object of a simulation system;
step 2, constructing a tide transfer scheme database through analysis of a stable calculation result; constructing a power grid stability control strategy expert system database through the early-stage data query, collection and regional power grid stability calculation results;
step 3, performing accident simulation on the key line or equipment through an accident simulation system, calculating the flow data after the accident according to the flow transfer database, and analyzing the accident influence and the risk; accident simulation results are displayed on a system interface in a chart form, and the heavy load and overload lines respectively represent the power flow data of the heavy load and overload lines by yellow and red numbers;
and 4, calling a stability control strategy expert system database according to the calculation result, transmitting the accident simulation result to an online security check system for security check, and analyzing whether the existing stability control strategy needs to be modified.
The power grid accident forecast simulation system is an application subsystem constructed on a unified support platform, and completes functions of information archiving, statistical query, intelligent analysis and the like by acquiring basic data of static stability analysis, transient stability analysis, dynamic stability analysis and voltage stability analysis; the method realizes operation monitoring, accident simulation, action result analysis and result communication of the power grid key line by the dispatching center in a normal period, and provides an accurate stable control strategy for dispatching operation personnel and other professionals.
After the accident prediction simulation system simulates the accident, the result is transmitted to the online security check system, the online security check system carries out load flow calculation to check whether the processing result of the simulation system is reliable or not, and finally an optimal stability control strategy is given.
The accident prediction simulation system has the functions of power grid flow analysis and a given accident handling strategy. After the calculation result of the power flow transfer ratio is obtained from the data uploaded by the safety and stability control device, calculation is carried out aiming at the simulated fault condition, and the overloaded line and the overload degree in the fault state can be directly displayed so as to conveniently analyze regional or local power flow and obtain an accident handling strategy. Once the accident model assumed in the plan occurs, people can quickly react and carry out emergency treatment according to the established operation procedures and operation requirements so as to achieve the purpose of reducing accident loss or avoiding accidents.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A power grid accident prediction simulation system is realized based on a D5000 platform and is characterized by comprising the following components: the system comprises a power grid accident prediction simulation subsystem, a safety and stability online management subsystem, an online security check subsystem, a power flow transfer scheme database and a stability control strategy expert system database;
the power grid accident prediction simulation subsystem is used for performing stability judgment on required voltage current and active and reactive power flow information through a stability online management system power grid operation mode and power flow data, and determining an operation object of the simulation system; the accident simulation system is used for simulating accidents of key lines or equipment;
the power flow transfer scheme database is established by analyzing a stable calculation result and is used for storing the power flow transfer scheme;
the stability control strategy expert system database is established according to the early-stage data query and collection result and the regional power grid stability calculation result and is used for storing the known stability control strategy;
the online safety check subsystem is used for carrying out safety check on an accident simulation result of the power grid accident expected simulation subsystem and analyzing whether the existing stability control strategy needs to be modified or not;
the power grid accident prediction simulation subsystem comprises a stability information collection and detection module, a fault simulation analysis module, an intelligent decision module and a result transmission and check module;
the stability information collection and detection module is used for visually presenting the real-time running condition and the load flow information of the current network to a user in a statistical chart form;
the fault simulation analysis module is used for analyzing and determining regional power grid line or equipment information to be simulated according to the requirements, simulating an accident, intelligently analyzing a tide result and an accident influence range after the accident and judging the risk;
the intelligent decision module is used for selecting a strategy table in a stability control strategy expert database under a corresponding operation mode after the simulated accident is analyzed, and providing a stability control strategy of the simulated accident according to a load flow transfer calculation result;
and the result transmission and checking module is used for transmitting the load flow data obtained by analysis and calculation and the stability control strategy, transmitting the result of the simulation system to the online safety checking system in real time, checking whether the stability control strategy is proper or not after actual load flow calculation, and otherwise, providing a new stability control suggestion.
2. The system according to claim 1, wherein the power grid accident prediction simulation subsystem is further networked with the EMS dispatching automation system, and is configured to receive real-time data of the EMS, perform dynamic security analysis on the power grid prediction accident, and determine a security and stability control policy.
3. The grid accident prediction simulation system according to claim 1, wherein the stability online management subsystem comprises a plurality of regional stability control systems;
the area stable control system is a system which is formed by connecting a safety stable control device arranged at two or more stations for solving the stability problem in a regional power grid, an information channel and communication interface equipment, and comprises: the system comprises a main station and a plurality of sub-stations, wherein the main station and the sub-stations are connected with the plurality of terminal stations through information channels and communication interfaces.
4. The grid accident prediction simulation system according to claim 3,
the main station is arranged in the hub substation or a power plant at the same position as the hub substation, and is used for summarizing the operation condition information of each substation, carrying out state estimation on a regional power grid, identifying the operation mode of the regional power grid, carrying out dynamic safety estimation on the regional power grid according to a given expected accident set, forming a safety and stability control strategy table on line or pre-installing a control strategy table obtained by off-line calculation, and transmitting the relevant operation mode information and the control strategy table to each substation; the system comprises a main station, a terminal station and a plurality of substations, wherein the main station is used for sending control commands to the main station and the substations according to a control strategy table when receiving the faults of the main station and the outgoing lines, and simultaneously transmitting the control commands to the terminal station through the substations;
the substation is arranged in an important transformer substation or a power plant connected with the transformer substation, and is used for acquiring working condition operation information of the substation and transmitting the working condition operation information to the main station; the system comprises a main station, a terminal station, a substation, a control strategy table and a plurality of sub-stations, wherein the main station is used for sending control commands to the main station and the sub-stations according to the control strategy table in the sub-stations when receiving the faults of the main station and outgoing lines of the main station;
the terminal station is used for receiving the control command transmitted by each station, executing local control and transmitting the control result information to the superior station.
5. The system for power grid accident prediction simulation according to claim 1, wherein the power flow transfer scheme database and the stability control strategy expert system database are created according to the following principles:
(1) canonical nomenclature
All library names, table names and domain names follow a uniform naming rule and are explained as necessary so as to facilitate design, maintenance and query;
(2) reference to control fields
During design, a proper database design management tool is selected to facilitate distributed design of developers and centralized audit management of data groups; adopting a unified naming rule, if the designed field already exists, directly referencing the field; otherwise, redesigning is needed;
(3) bank table repeat control
In the design process, if most fields are found to exist, whether the designed library table exists or not is suspected; whether the library tables are really repeated is confirmed by inquiring the library table where the field is located and corresponding designers;
(4) concurrent control
Concurrent control should be carried out in the design, namely, only one person has control right at the same time and other persons can only carry out inquiry for the same base table.
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| 基于D5000系统的电网事故预案推演系统设计;江千军等;《上海电力学院学报》;20180430;第34卷(第2期);第157-162页 * |
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