CN105958474B - Dynamic capacity increasing method and system for power transmission line for power grid regulation and control system - Google Patents
Dynamic capacity increasing method and system for power transmission line for power grid regulation and control system Download PDFInfo
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- CN105958474B CN105958474B CN201610279433.4A CN201610279433A CN105958474B CN 105958474 B CN105958474 B CN 105958474B CN 201610279433 A CN201610279433 A CN 201610279433A CN 105958474 B CN105958474 B CN 105958474B
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Abstract
The invention provides a dynamic capacity increasing method and system for a power transmission line for a power grid regulation and control system, wherein the system comprises a data processing module, a real-time calculation module, a capacity increasing analysis module and a graphic visualization module; the data processing module is used for acquiring data acquired by the device in the power transmission and transformation system; integrating and identifying the received device data by taking the line as a unit; the real-time calculation module is used for calculating the dynamic current-carrying capacity of the power transmission line in real time by using the identified data; the capacity increasing analysis module is used for carrying out static safety evaluation analysis on the power grid, predicting the necessity and feasibility of capacity increasing of lines in each time period and sending result data to the graphic visualization display module; the invention carries out safety evaluation on the dynamic capacity increasing process from two aspects of equipment safety and power grid safety, and ensures the safety of the dynamic capacity increasing.
Description
Technical Field
The invention relates to a dynamic capacity increasing method and system for a power grid, in particular to a dynamic capacity increasing method and system for a power transmission line for a power grid regulation and control system.
Background
On the premise of not breaking through the existing safety regulations, the dynamic capacity increase calculates the dynamic current-carrying capacity of the line at the current moment by collecting data in real time, and makes full use of the objective implicit capacity of the power transmission line. The dynamic capacity increasing technology can bring remarkable economic benefits at the peak load period and has good application prospect.
At present, most of research on dynamic capacity increase is based on a power transmission and transformation system, a single power transmission line is analyzed, and the research range mainly focuses on data acquisition and calculation. Because the system does not have a complete power grid model and an operation mode, the safety of a single line can be monitored only by remotely acquiring real-time operation data from a dispatching system, and the analysis on the safety of the power grid is lacked. In actual power grid dispatching operation, not only the safety of single equipment needs to be considered, but also the static safety of the whole power grid in operation needs to be ensured, so that the accuracy and the reliability of the traditional dynamic capacity-increasing calculation result based on the equipment level in actual dispatching application are influenced to a certain extent.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a dynamic capacity increasing method and a dynamic capacity increasing system for a power transmission line for a power grid regulation and control system.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a dynamic capacity increasing method for a power transmission line for a power grid regulation and control system comprises the following steps:
(1) acquiring device acquisition data from a power transmission and transformation system, wherein the device acquisition data comprises equipment state data and microclimate data, and a power grid regulation and control system receives, analyzes and writes the acquisition data into a database;
(2) integrating and identifying received device data by taking a line as a unit, and selecting a group of most conservative data according to the influence of different data types on the current-carrying capacity of the line;
(3) calculating the dynamic current-carrying capacity of the power transmission line in real time by using the identified data; according to the definition of the section of the power grid, carrying out dynamic power limit calculation on the section containing the dynamic capacity-increasing line;
(4) constructing a real-time section of a power grid, and performing static safety assessment analysis on the power grid based on the real-time section of the power grid and a calculation result of the dynamic current-carrying capacity of the power transmission line to assess the power grid safety in the dynamic capacity increasing process;
(5) and acquiring planning and prediction data from provincial dispatching based on the real-time section of the power grid, constructing a multi-period power grid prediction section in a future period of time, carrying out power flow analysis by combining a dynamic current-carrying capacity calculation result of the power transmission line, and predicting the necessity and feasibility of line capacity increase in each period of time.
Preferably, the step (1) comprises the following steps:
step 1-1, a standard E-format data file is derived from a power transmission and transformation system database according to the wire state and microclimate, and the file name and the file content of the E-format data file both contain data acquisition time scales; the export period of the E-format data file is 1 minute;
step 1-2, uploading the E-format file to a designated directory of a WEB server in a security III area of the power grid regulation and control system in an FTP mode, and transmitting the E-format file to a corresponding directory of a dynamic capacity increasing server in a security II area of the power grid regulation and control system through a reverse isolation device;
step 1-3, deploying a file interface program on the dynamic capacity increasing server, detecting and analyzing the data file, calling a real-time library interface to write an analysis result into a real-time database based on the data storage service of the regulation and control system, and calling a sampling interface to write analysis data into a historical database.
Preferably, the step (2) comprises the steps of:
step 2-1, missing data in the device data are supplemented, and when single measurement data of the wire temperature and the environmental temperature are missing, the data are supplemented by a moving average value of historical sampling data by using the slowly changing characteristics of the data;
step 2-2, converting the wind direction angle data;
step 2-3, integrating the device data according to types by taking a line as a unit, calculating the average value of each type of data, setting a deviation threshold value, removing the data from the group when the deviation average value of a certain data reaches the threshold value, removing one data each time, repeating the step until no abnormal data exists in the group, and finishing the identification processing of the device data;
and 2-4, after data identification processing, respectively selecting the numerical values which enable the current-carrying capacity and the equipment state to be most conservative according to the contribution of each data type to the current-carrying capacity of the wire, and taking the numerical values as the final result of line data identification.
Preferably, the step 2-2 comprises the following steps:
2-2-1, modeling a line tower, maintaining the angle between the line tower and front and rear towers by taking the north direction as a reference, and maintaining the membership relation between the device and the towers;
2-2-2, after receiving wind direction angle data, calculating a relative included angle between the wind direction and the front and rear wires according to a tower model corresponding to the device, and converting the relative included angle into an acute angle;
and 2-2-3, selecting an angle with a smaller sine value as final wind direction angle data.
Preferably, the step 3 comprises the following steps:
step 3-1, respectively calculating corresponding dynamic current-carrying capacities of the wires at the allowable temperatures of 70 ℃ and 80 ℃ according to a wire thermal stability equilibrium equation by using the complete line data after the data identification, wherein the temperature of 70 ℃ corresponds to a line current limit value under the normal operation condition of a power grid, and the dynamic current-carrying capacities are used for line safety monitoring and dynamic capacity-increasing prediction analysis under the normal condition; the temperature of 80 ℃ corresponds to a line current limit value in a power grid fault state, and the line current limit value is used for calculating the dynamic power limit of the power grid section and performing N-1 static safety evaluation in the capacity increasing process;
step 3-2, replacing the static fault current limit value with the line dynamic fault current-carrying capacity calculation result according to the formula
Converting the current into a cross-sectional power, in which UNIs a rated voltage with the unit of kV,
is the power factor; w is the section tidal current transfer ratio, P is the section power, If,minRepresenting the minimum value of the dynamic fault current-carrying capacity of all lines of the section; and the calculation result of the line dynamic fault current-carrying capacity is the calculation result of the line current limit value in the power grid fault state.
Preferably, the step 4 comprises the following steps:
step 4-1, acquiring a power grid model and real-time operation data from state estimation application of advanced application of a power grid regulation and control system safety I area regulation and control system to construct a power grid real-time section;
step 4-2, replacing the line fault static current limit value in the database with the line dynamic fault current limit value calculated in real time for the dynamic capacity-increased line;
and 4-3, analyzing the static safety of the power grid by adopting a power grid static safety analysis method in the advanced application module of the regulation and control system, and if the line or section out-of-limit condition does not occur, indicating that the capacity increasing process meets the static safety of the power grid.
Preferably, the step 5 comprises the following steps:
step 5-1, acquiring a power grid model and real-time operation data from state estimation application of advanced application of a safety I area regulation and control system of the power grid regulation and control system to construct a power grid real-time section as a ground state section;
step 5-2, acquiring a day-ahead power generation plan, ultra-short-term load prediction and maintenance plan data from the provincial dispatching system, analyzing and writing the data into a local real-time library;
step 5-3, taking n minutes as a section period, extracting data of a period of time in the future from the planning and prediction data, and superposing the analyzed equipment data to the ground-state sections according to a mapping relation established by provincial and regional regulation and control system equipment to form m prediction sections;
step 5-4, carrying out load flow calculation on the m constructed prediction sections, and analyzing line current appearing in each time period and out-of-limit risks of the power grid stable sections;
5-5, analyzing the out-of-limit risk by adopting the current meteorological conditions, judging whether the dynamic current-carrying capacity or the section power limit of the line can eliminate the out-of-limit risk in the corresponding time period, if so, indicating that the line has the dynamic capacity-increasing condition, and giving a specific capacity-increasing time period and capacity-increasing capacity; otherwise, the line still has out-of-limit risk, and an early warning is given.
Preferably, the power transmission line dynamic capacity increasing system for the power grid regulation and control system comprises a data processing module,
The real-time calculation module, the capacity-increasing analysis module and the graph visualization module;
the data processing module is used for acquiring data acquired by the device in the power transmission and transformation system, wherein the data comprises equipment state data and microclimate data, and the power grid regulation and control system receives, analyzes and writes the acquired data into a database; integrating and identifying the received device data by taking a line as a unit, and sending the identified line parameters to the real-time computing module in real time;
the real-time calculation module is used for calculating the dynamic current-carrying capacity of the power transmission line in real time by using the identified data; according to the definition of the section of the power grid, carrying out dynamic power limit calculation on the section containing the dynamic capacity-increasing line, and sending the calculation result of the dynamic current-carrying capacity of the line to the capacity-increasing analysis module;
the capacity increasing analysis module is used for carrying out static safety evaluation analysis on the power grid, predicting the necessity and feasibility of capacity increasing of lines in each time period and sending result data to the graphic visualization display module;
the graphic visual display module is used for visually displaying the static safety assessment analysis result and the prediction result of the line capacity increase in each time period based on the graphic function of the basic platform; and publishing the dynamic capacity increasing picture and function based on the WEB basic service, and checking by the provincial and local dispatching system through WEB client login in a safety III area of the power grid regulation and control system.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a general implementation scheme of dynamic capacity increase in the application of a regulation and control system, breaks through the limitation of the traditional dynamic capacity increase technology based on a power transmission and transformation system in the aspects of a power grid model and a mode, performs capacity increase analysis and safety evaluation from the perspective of the whole network, and improves the practicability of the dynamic capacity increase.
The method fully considers the requirement of a regulation and control system on the safety of the power grid, integrates and identifies the collected data by utilizing the relevance among a plurality of device data of the line and the continuity between the real-time data and the historical data, and selects the data which leads the current-carrying capacity result to tend to be conservative for calculation, thereby ensuring the safety of the power grid. And the dynamic power limit of the section of the power grid is calculated in real time, so that the use habit of a regulation and control system is better met.
The method utilizes core modules of a regulation and control system scheduling plan, load flow calculation, static safety analysis and the like to carry out predictive analysis on the dynamic capacity increase of the power grid, judges the necessity and feasibility of the capacity increase and provides technical support for a dispatcher to drive the power grid; and the safety evaluation is carried out on the dynamic capacity increasing process from the two aspects of equipment safety and power grid safety, so that the safety of the dynamic capacity increasing is ensured.
Drawings
FIG. 1 is a general architecture diagram of a dynamic capacity expansion system of a power transmission line for a power grid regulation system according to the present invention
FIG. 2 is a flowchart of a dynamic capacity increasing method for a power transmission line for a power grid regulation and control system provided by the invention
FIG. 3 is a flow chart of data transmission and transformation system into a database according to the present invention
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the overall architecture of the power transmission line dynamic capacity increasing system for the power grid regulation and control system is provided.
The current scheduling system is generally divided into three safe zones. The safety I area is a scheduling real-time monitoring area and mainly runs functional modules needing real-time monitoring, such as data acquisition and monitoring (SCADA), Automatic Generation Control (AGC) and the like; the safety II area runs functional modules with relatively low real-time performance, such as a dispatching plan, a Dispatcher Training Simulation (DTS) and the like; the safety III area is mainly an information safety area, an operation information management system, a WEB and other functional modules. The dynamic capacity increasing system is deployed in a safe II area of a regional dispatching system and generally comprises 4 modules of data processing, real-time calculation, capacity increasing analysis and graphic visualization display. The method comprises the steps of acquiring device acquisition data from a power transmission and transformation on-line monitoring system through a data interaction interface, acquiring a power grid model and real-time operation mode data from a safety I area based on a local service bus interface, and acquiring a power generation plan and load forecast data from a superior dispatching based on a remote service bus interface for generating a power grid prediction section. The main functional design of each module is as follows:
the data processing module integrates the equipment state data and the microclimate data received from the outside, establishes mapping between the data and the power grid equipment, identifies the data by utilizing the incidence relation of a plurality of sampling data of the same equipment, identifies and corrects error data, and improves the data accuracy; and (3) determining a complete set of calculation data for calculation according to the influence of the data type on the current-carrying capacity from the data collected by a plurality of devices of the line.
The real-time calculation module calculates the dynamic current-carrying capacity of the line in real time according to the identified line parameters, and the calculation result provides basic data for subsequent section calculation, capacity increase prediction and power grid safety evaluation; and according to the definition of the stable section of the system, carrying out real-time analysis and calculation on the dynamic power limit of the stable section containing the dynamic capacity-increasing line, and providing data support for power grid regulation and control. Meanwhile, key data such as line current, wire temperature, section power limitation and the like are monitored in real time, and early warning information is given out when heavy load or out-of-limit is found.
The capacity increase analysis module comprises two parts of static safety assessment and capacity increase prediction of the power grid. Firstly, a model and mode data are obtained from an I area to construct a real-time section of a power grid, and on the basis, power generation plan and load prediction data obtained from superior scheduling are superposed to generate a multi-period power grid prediction section. Performing static safety real-time evaluation on the power grid in the capacity increasing process based on the real-time section of the power grid and the calculation result of the line current-carrying capacity; and performing power grid capacity increase analysis in a period of time in the future based on the multi-period power grid prediction section and the current-carrying capacity real-time calculation result, and providing the period of the power grid needing capacity increase, the corresponding capacity-increasing line and the capacity-increasing capacity.
The graphic visualization display module is used for visually displaying the results of dynamic capacity increase real-time calculation, evaluation and prediction based on the graphic function of the basic platform; and publishing the dynamic capacity increasing picture and function based on the WEB basic service, and logging and checking the province and the local area through a WEB client in the area III. In order to enable provincial and provincial regions to carry out dynamic capacity increasing cooperative regulation, key calculation data of the local dynamic capacity increasing system are uploaded to a provincial regulation and control system in a data forwarding mode of a dispatching data network, and reference is provided for provincial regulation and control personnel.
As shown in fig. 2, a method for dynamically increasing capacity of a power transmission line for a power grid regulation and control system includes the following steps:
step 1: exporting the wire state and the microclimate data into a data file by taking the device as a unit, sending the data file into a local regulation and control system, and receiving, analyzing and writing the file into a database by the local regulation;
step 2: integrating and identifying received device data by taking a line as a unit, and selecting a group of most conservative data according to the influence of different data types on the current-carrying capacity of the line;
dynamic capacity-increasing data access, modeling and identification technology
The equipment state and microclimate acquisition data are firstly accessed to the power transmission and transformation on-line monitoring system. The data is periodically exported from the power transmission and transformation on-line monitoring system in a file mode and is uploaded to a regulation and control system, and the data is received, analyzed and stored in a database. At present, the data monitoring device of the power transmission line mainly comprises wire temperature monitoring, microclimate monitoring, wire sag monitoring and the like. The main data types accessed in the dynamic capacity increasing system are shown in table 1:
table 1 data type and periodicity of access
The acquisition period of the device required by the power transmission and transformation on-line monitoring system is usually 10 minutes, and when a line fault occurs in a power grid and a large amount of tide is transferred, the temperature of a lead is rapidly increased in a short time, so that the real-time requirement of power grid regulation and control cannot be met. The acquisition period of the device is shortened to 1 minute, and meanwhile, the data forwarding and processing period is correspondingly adjusted.
A background program is deployed in the power transmission and transformation online monitoring system, data collected by the latest device is exported from a database into a standard E-format file in a period of 1 minute, the file name and the file content both contain data collection time scales, and each device corresponds to one data record. The file is pushed to a specified directory of a WEB server in a region III of the regulation and control system in an FTP mode and is transmitted to a corresponding directory of a dynamic capacity increasing server in a region II through a reverse isolation device. And a resident file interface program is deployed on the dynamic capacity increasing server, the file is detected and analyzed and written into the real-time database, and meanwhile, a sampling interface is called to write the data into the historical database. The data access flow diagram is shown in fig. 3.
The method comprises the following steps of processing and identifying external data which are uniformly accessed into a regulation and control system, wherein the external data comprise missing data supplement, wind direction angle conversion, abnormal data correction and the like, and the method specifically comprises the following steps:
1) when the single measured data of the wire temperature and the environment temperature are missing, the characteristic of slow change of the data is utilized to supplement with the moving average value of the historical sampling data. Taking the temperature of the wire as an example, data x of a data time n of the device is setnMissing, the first 10 sample values x of this device data are taken from the historical databasen-1～xn-10Calculating the average value thereof
This is taken as the acquisition data for the device at time n.
2) The wind direction angle collected by the device is based on the north direction and needs to be converted into an included angle with the direction of the lead. Firstly, modeling is carried out on a line tower, angles between the line tower and front and rear towers are maintained (by taking the north direction as a reference), and the membership relation between a device and the towers is maintained. After the wind direction angle data are received, the relative included angle (converted into an acute angle) between the wind direction and the front and rear wires is calculated according to a tower model corresponding to the device, and finally, an angle with a small sine value is selected as final wind direction angle data.
3) The device data is integrated by type in units of lines. Taking the type of wire temperature data as an example, assuming that the line i has n temperature monitoring devices, a set of n wire temperature data is obtained by integration. And eliminating abnormal data in the group of data by adopting an average deviation method. The average value of n data is calculated, a deviation threshold value (such as 20%) is set, when the deviation average value of a certain data reaches the threshold value, the data is removed from the group, one data is removed each time, the step is repeated until no abnormal data exists in the group, and at the moment, k data are removed altogether.
After data identification processing, each data type has n-k data, and the numerical values which enable the current-carrying capacity and the equipment state to be most conservative are respectively selected according to the contribution of each data type to the current-carrying capacity of the wire and serve as the final result of the data identification of the line i. The value selection principle for various data types is shown in table 2:
TABLE 2 dereferencing principles of different data
And step 3: calculating the dynamic current-carrying capacity of the power transmission line by using the identified data; according to the definition of the section of the power grid, carrying out dynamic power limit calculation on the section containing the dynamic capacity-increasing line;
line dynamic current-carrying capacity and section dynamic power limit calculation technology
Through data processing and identification, each dynamic capacity increasing line forms a complete set of calculation and monitoring data. And respectively calculating the corresponding dynamic current-carrying capacity when the allowable temperature of the wire is 70 ℃ and 80 ℃ according to a wire thermal stability equilibrium equation. Wherein the temperature of 70 ℃ corresponds to the line current limit value under the normal operation condition of the power grid, and the method is used for line safety monitoring and dynamic capacity-increasing prediction analysis under the normal condition; and the temperature of 80 ℃ corresponds to the line current limit value in the power grid fault state, and the line current limit value is used for calculating the dynamic power limit of the power grid section and performing N-1 static safety evaluation in the capacity increasing process.
The line dynamic current-carrying capacity result calculated according to the data processing method of the invention is conservative, and the requirement of a regulation and control system on safety is fully considered. In practical engineering application, a regulator controls the dynamic current-carrying capacity of the line according to the minimum value calculated on the same day.
And (4) performing section power dynamic allowance calculation based on the line dynamic fault current-carrying capacity calculation result (corresponding to the current-carrying capacity of which the allowable temperature of the wire is 80 ℃). Setting the current-carrying capacity of dynamic fault current of ith line of section as If,i，i∈Sk. Wherein SkTransmission of electricity in section kAnd (4) line collection. If the circuit does not have the dynamic capacity-increasing condition, If,iThe quiescent fault current limit is taken directly. From If,i，i∈SkTake the minimum value If,minAs a reference value, a push-to-type
And converting the current into the section power. Wherein U isNRated voltage (kV);
is the power factor; and w is the cross-section power flow transfer ratio.
And 4, step 4: constructing a real-time section of the power grid, performing static safety analysis on the power grid based on a line and section current-carrying capacity calculation result, and evaluating the power grid safety in a dynamic capacity increasing process;
dynamic capacity-increasing power grid safety assessment technology
The safety of the important section in the capacity increasing process can be effectively monitored through the calculation of the dynamic power limit of the section, but the monitoring range still cannot cover the non-section line in the power grid. In order to ensure the static safety of the whole network in the capacity increasing process, the static safety of the power grid in the capacity increasing process needs to be evaluated and monitored in real time.
And acquiring a power grid model from the I-area state estimation application and constructing a real-time analysis section of the power grid in a real-time operation mode, replacing a line fault static current limit value in a database with a line dynamic fault current limit value calculated in real time for a dynamic capacity-increased line, and analyzing the static safety of the power grid by adopting a power grid static safety analysis method considering a safety automatic device. If the line or section out-of-limit condition does not occur, the capacity increasing process is shown to meet the static safety of the power grid. The static safety evaluation calculation period of the dynamic capacity-increasing power grid is 1 minute.
And 5: and acquiring planning and prediction data from provincial dispatching based on the real-time section of the power grid, constructing a multi-period power grid prediction section in a future period of time, carrying out power flow analysis, and predicting the necessity and feasibility of line capacity increase in each period of time.
The time scale of dynamic capacity increase is expanded from a real-time level to a prediction level, the necessity and feasibility of capacity increase for a period of time in the future under the condition of normal operation of the power grid are analyzed, and guidance is provided for operation decision of regulation and control personnel.
And (4) rolling to construct 4 power grid prediction sections in one hour in the future every 15 minutes as a period, and analyzing line current and power grid stable section out-of-limit risks which may occur in each time period based on load flow calculation. Aiming at the risks, current meteorological conditions (meteorological forecast information can also be accessed) are adopted for analysis, and whether line dynamic current-carrying capacity or section power limitation can eliminate out-of-limit risks in corresponding time intervals or not is judged.
The forecasting section is constructed by superposing the power generation plan data, the load forecasting data and the maintenance plan data in the forecasting time interval on the real-time power grid section. Mainly comprises the following steps:
1) firstly, a power grid model and a real-time operation mode are obtained from I-zone state estimation application based on a local service bus to construct a power grid real-time section as a ground state section of 4 prediction sections.
2) And acquiring a day-ahead power generation plan, ultra-short-term load prediction and maintenance plan data from the provincial dispatching system, analyzing and writing the data into a local real-time library.
3) And extracting data corresponding to the prediction time period from the planning data and the prediction data, and superposing the analyzed equipment data to the ground state section according to the mapping relation established by provincial and regional regulation and control system equipment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A dynamic capacity increasing method for a power transmission line for a power grid regulation and control system is characterized by comprising the following steps:
(1) acquiring device acquisition data from a power transmission and transformation system, wherein the device acquisition data comprises equipment state data and microclimate data, and a power grid regulation and control system receives, analyzes and writes the acquisition data into a database;
(2) integrating and identifying received device data by taking a line as a unit, and selecting a group of most conservative data according to the influence of different data types on the current-carrying capacity of the line;
(3) calculating the dynamic current-carrying capacity of the power transmission line in real time by using the identified data; according to the definition of the section of the power grid, carrying out dynamic power limit calculation on the section containing the dynamic capacity-increasing line;
(4) constructing a real-time section of a power grid, and performing static safety assessment analysis on the power grid based on the real-time section of the power grid and a calculation result of the dynamic current-carrying capacity of the power transmission line to assess the power grid safety in the dynamic capacity increasing process;
(5) acquiring planning and prediction data from provincial dispatching based on the real-time section of the power grid, constructing a multi-period power grid prediction section of a future period of time, carrying out power flow analysis by combining a dynamic current-carrying capacity calculation result of the power transmission line, and predicting the necessity and feasibility of line capacity increase of each period of time;
the step (2) comprises the following steps:
step 2-1, missing data in the device data are supplemented, and when single measurement data of the wire temperature and the environmental temperature are missing, the data are supplemented by a moving average value of historical sampling data by utilizing the slowly changing characteristics of the data;
step 2-2, calculating a relative included angle between the wind direction and the front and rear wires by a tower model corresponding to the device, converting the relative included angle into an acute angle, and finally selecting an angle with a small sine value as final wind direction angle data;
step 2-3, integrating the device data according to types by taking a line as a unit, calculating the average value of each type of data, setting a deviation threshold value, removing the data from the group when the deviation average value of a certain data reaches the threshold value, removing one data each time, repeating the step until no abnormal data exists in the group, and finishing the identification processing of the device data;
and 2-4, after data identification processing, respectively selecting the numerical values which enable the current-carrying capacity and the equipment state to be most conservative according to the contribution of each data type to the current-carrying capacity of the wire, and taking the numerical values as the final result of line data identification.
2. The method of claim 1, wherein the step (1) comprises the steps of:
step 1-1, leading out a standard E-format data file from a power transmission and transformation system database of the wire state and the microclimate, wherein the file name and the file content of the standard E-format data file both contain a data acquisition time scale; the export period of the standard E-format data file is 1 minute;
step 1-2, uploading the standard E format file to a designated directory of a WEB server in a security III area of the power grid regulation and control system in an FTP mode, and transmitting the standard E format file to a corresponding directory of a dynamic capacity increasing server in a security II area of the power grid regulation and control system through a reverse isolation device;
step 1-3, deploying a file interface program on the dynamic capacity increasing server, detecting and analyzing the data file, calling a real-time library interface to write an analysis result into a real-time database based on the data storage service of the regulation and control system, and calling a sampling interface to write analysis data into a historical database.
3. The method according to claim 1, wherein the step 2-2 comprises the steps of:
2-2-1, modeling a line tower, maintaining the angle between the line tower and front and rear towers by taking the north direction as a reference, and maintaining the membership relation between the device and the towers;
2-2-2, after receiving wind direction angle data, calculating a relative included angle between the wind direction and the front and rear wires according to a tower model corresponding to the device, and converting the relative included angle into an acute angle;
and 2-2-3, selecting the small angle in the sine value as final wind direction angle data.
4. The method of claim 1, wherein the step (3) comprises the steps of:
step 3-1, respectively calculating corresponding dynamic current-carrying capacities of the wires at the allowable temperatures of 70 ℃ and 80 ℃ according to a wire thermal stability equilibrium equation by using complete line data after data identification, wherein the temperature of 70 ℃ corresponds to a line current limit value under a normal operation condition of a power grid, and the dynamic current-carrying capacities are used for line safety monitoring and dynamic capacity-increasing prediction analysis under a normal condition; the temperature of 80 ℃ corresponds to a line current limit value in a power grid fault state, and the line current limit value is used for calculating the dynamic power limit of the power grid section and performing N-1 static safety evaluation in the capacity increasing process;
step 3-2, replacing the static fault current limit value with the line dynamic fault current-carrying capacity calculation result according to the formula
Converting the current into a cross-sectional power, in which UNIs a rated voltage with the unit of kV,
is the power factor; w is the section tidal current transfer ratio, P is the section power, If,minRepresenting the minimum value of the dynamic fault current-carrying capacity of all lines of the section; and the calculation result of the line dynamic fault current-carrying capacity is the calculation result of the line current limit value in the power grid fault state.
5. The method of claim 1, wherein the step (4) comprises the steps of:
step 4-1, acquiring a power grid model and real-time operation data from state estimation application of advanced application of a power grid regulation and control system safety I area regulation and control system to construct a power grid real-time section;
step 4-2, replacing the line fault static current limit value in the database with the line dynamic fault current limit value calculated in real time for the dynamic capacity-increased line;
and 4-3, analyzing the static safety of the power grid by adopting a power grid static safety analysis method in the advanced application module of the regulation and control system, and if the line or section out-of-limit condition does not occur, indicating that the capacity increasing process meets the static safety of the power grid.
6. The method of claim 1, wherein the step (5) comprises the steps of:
step 5-1, acquiring a power grid model and real-time operation data from state estimation application of advanced application of a safety I area regulation and control system of the power grid regulation and control system to construct a power grid real-time section as a ground state section;
step 5-2, acquiring a day-ahead power generation plan, ultra-short-term load prediction and maintenance plan data from the provincial dispatching system, analyzing and writing the data into a local real-time library;
step 5-3, taking n minutes as a section period, extracting data of a period of time in the future from the planning and prediction data, and superposing the analyzed equipment data to the ground-state sections according to a mapping relation established by provincial and regional regulation and control system equipment to form m prediction sections;
step 5-4, carrying out load flow calculation on the m constructed prediction sections, and analyzing line current appearing in each time period and out-of-limit risks of the power grid stable sections;
5-5, analyzing the out-of-limit risk by adopting the current meteorological conditions, judging whether the dynamic current-carrying capacity or the section power limit of the line can eliminate the out-of-limit risk in the corresponding time period, if so, indicating that the line has the dynamic capacity-increasing condition, and giving a specific capacity-increasing time period and capacity-increasing capacity; otherwise, the line still has out-of-limit risk, and an early warning is given.
7. A dynamic capacity increasing system of the power transmission line for the power grid regulation and control system, which is used for the dynamic capacity increasing method of the power transmission line for the power grid regulation and control system according to any one of claims 1 to 6, is characterized by comprising a data processing module, a real-time calculating module, a capacity increasing analysis module and a graph visualization module;
the data processing module is used for acquiring data acquired by the device in the power transmission and transformation system, wherein the data comprises equipment state data and microclimate data, and the power grid regulation and control system receives, analyzes and writes the acquired data into a database; integrating and identifying the received device data by taking a line as a unit, and sending the identified line parameters to the real-time computing module in real time;
the real-time calculation module is used for calculating the dynamic current-carrying capacity of the power transmission line in real time by using the identified data; according to the definition of the section of the power grid, carrying out dynamic power limit calculation on the section containing the dynamic capacity-increasing line, and sending the calculation result of the dynamic current-carrying capacity of the line to the capacity-increasing analysis module;
the capacity increasing analysis module is used for carrying out static safety evaluation analysis on the power grid, predicting the necessity and feasibility of capacity increasing of lines in each time period and sending result data to the graphic visualization display module;
the graphic visual display module is used for visually displaying the static safety assessment analysis result and the prediction result of the line capacity increase in each time period based on the graphic function of the basic platform; and publishing the dynamic capacity increasing picture and function based on the WEB basic service, and checking by the provincial and local dispatching system through WEB client login in a safety III area of the power grid regulation and control system.
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| CN107181258B (en) * | 2017-07-18 | 2020-08-07 | 上海海能信息科技有限公司 | Local area power grid dynamic capacity-increasing full-cycle risk constraint and life evaluation method |
| CN109696864B (en) * | 2018-11-28 | 2021-06-01 | 国电南瑞科技股份有限公司 | Implementation method of thermal stability emergency control system adaptive to external environment |
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