CN114996912A - Power grid power transmission section dynamic capacity-increase assessment method and system based on meteorological information - Google Patents
Power grid power transmission section dynamic capacity-increase assessment method and system based on meteorological information Download PDFInfo
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Abstract
The invention provides a power grid power transmission section dynamic capacity-increasing assessment method and system based on meteorological information, and belongs to the technical field of communication. The method comprises the following steps: extracting transmission section transmission capacity limited data of a corresponding level power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data; selecting out the limited power transmission section according to the data with limited power transmission section transmission capacity; acquiring out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction; and analyzing the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value based on the out-of-domain meteorological information according to the sequence of the limited degree from high to low.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a power grid power transmission section dynamic capacity-increasing assessment method and system based on meteorological information.
Background
The dynamic capacity increasing is to calculate the dynamic current-carrying capacity of the line at the current moment by collecting data in real time on the premise of not breaking through the existing safety regulations, and to fully utilize the objective invisible capacity of the transmission line. The dynamic capacity increasing technology can bring remarkable economic benefits at the moment of load peak and has good application prospect.
The transmission capacity of the overhead transmission line is not only directly related to the structural parameters and the electrical operation parameters of the conductor, but also closely related to the meteorological environment parameters of the geographical position of the conductor. At present, because the regional and seasonal differences of all levels of power grids in China are particularly obvious, the thermal stability quota of the electrical equipment can not truly reflect the transmission capacity of the power transmission line only by setting a summer operation mode, a winter operation mode and a spring-autumn operation mode according to seasons.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for evaluating dynamic capacity increase of a power transmission section of a power grid based on regional meteorological information, which calculate a dynamic capacity increase promotion space of the power transmission line according to meteorological information corresponding to a limited power transmission section of the power transmission line, and improve the transmission capacity of the power transmission line.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows:
a dynamic capacity increase assessment method for a power transmission section of a power grid based on regional meteorological information comprises the following steps:
extracting transmission section transmission capacity limited data of a corresponding level power grid according to the regional power grid mode report and an online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data;
selecting out the limited power transmission section according to the data with limited power transmission section transmission capacity;
acquiring out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction;
and analyzing the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value based on the out-of-domain meteorological information according to the sequence of the limited degree from high to low.
Preferably, the regional power grid operation mode scheduling plan data includes an equipment state change plan, load prediction, a unit power generation plan, a partition/provincial total exchange plan and direct current line plan data, and the unit real-time operation data includes grid structure real-time topology of a regional power grid, regional power grid voltage and regional power grid active power.
Preferably, the acquiring of the out-of-domain meteorological information corresponding to each limited power transmission section includes, based on area grid meteorological information provided by a meteorological center, the out-of-domain meteorological information being a meteorological data average value of a grid area where the out-of-domain meteorological information is located according to longitude and latitude:
collecting longitude and latitude coordinates of a starting end and longitude and latitude coordinates of a power transmission line lead or a lead cluster contained in the limited power transmission section;
calculating the spanning distance between the longitude and latitude coordinates of the starting end and the longitude and latitude coordinates of the tail end;
when the crossing distance is smaller than a distance threshold value, acquiring the real-time environment temperature, the real-time illumination intensity, the real-time wind speed and the real-time wind direction corresponding to the longitude and latitude coordinates of the starting end or the longitude and latitude coordinates of the tail end as out-of-domain meteorological information corresponding to the limited power transmission section; the real-time environment temperature refers to the average value T of the environment temperature aavg The real-time illumination intensity refers to the average value J of the solar radiation intensity avg The real-time wind speed refers to the wind speed average value V of the height of 70m from the ground 70 ；
When the crossing distance is not less than the distance threshold value, acquiring the start end real-time environment temperature, the start end real-time illumination intensity, the start end real-time wind speed and the start end real-time wind direction corresponding to the start end longitude and latitude coordinates, and acquiring the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction corresponding to the tail end longitude and latitude coordinates, wherein the out-of-domain meteorological information corresponding to the limited power transmission section comprises the start end real-time environment temperature, the start end real-time illumination intensity, the start end real-time wind speed, the start end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction.
Preferably, the analyzing the transmission capacity boost space and the corresponding single gear boost value of each limited power transmission section according to the sequence of the limited degree from high to low and based on the out-of-domain meteorological information includes:
calculating the active power transmission limited power of each limited power transmission section in a future state planning mode in real time;
according to the sequence from high to low, the limited power is transmitted according to the active power of each limited power transmission section, and each limited power transmission section is sequentially analyzed according to the sequencing result;
selecting one limited power transmission section, and collecting online operation data of a power transmission line lead or a lead cluster contained in the limited power transmission section;
according to the online operation data and the out-of-domain meteorological information, online calculation of transmission capacity is carried out on transmission line leads or lead clusters contained in the limited transmission section, and an online calculation result of the transmission capacity of the transmission line is obtained;
performing static security check of the power grid according to the online calculation result of the transmission capacity of the power transmission line;
and determining a transmission capacity lifting space of the limited transmission section based on the online calculation result of the transmission capacity of the transmission line, setting the number of gears according to the actual regulation and control operation adjustment condition, and calculating the single gear lifting value corresponding to the number of gears.
Preferably, when the crossing distance is smaller than a distance threshold, the online calculation of the transmission capacity of the transmission line conductor or the conductor cluster included in the limited transmission section is performed according to the online operation data and the out-of-domain meteorological information, and the obtaining of the online calculation result of the transmission capacity of the transmission line includes:
setting wire temperatureTo a nominal allowable temperature T 1 And calculating the current thermal stability limit value I of the transmission line wire I in the normal operation state T1,i ：
I 2 R T1 +P s ＝P r +P f
In the formula, P s Is the solar heat absorption power, P r For radiating heat power, P f For convective heat dissipation power, R T1 Is the temperature T of the wire 1 The resistance value of the time alternating current wire, I is the current-carrying capacity of the wire;
wherein the radiation heat dissipation power P r The calculation formula of (c) is:
in the formula, D is the diameter of the lead, epsilon is the radiation heat dissipation coefficient of the lead, epsilon belongs to [0.9,0.95 ];
wherein, the convection heat dissipation power P f The calculation formula of (2) is as follows:
P f ＝λE μ π(T 1 -T aavg )
R e ＝1.644×10 9 V 70 D[T aavg +0.5(T 1 -T aavg )] -1.78
in the formula, E μ Is Euler number, R e Is Reynolds number;
wherein the solar heat absorption power P s The calculation formula of (2) is as follows:
P s ＝αJ avg D
in the formula, alpha is a heat absorption coefficient of the surface of the lead, wherein the value range of the bright new line is 0.35-0.46, and the value range of the old line or the black preservative-coated line is 0.9-0.95;
wherein, R is T1 The calculation formula of (2) is as follows:
R T1 ＝(1+k e )R d
R dT1 ＝R 20 [1+α 20 (T 1 -20)]
in the formula, R dT1 For the temperature of the wire to be T 1 Resistance value of time-dependent DC conductor, alpha 20 A temperature coefficient of the wire material at 20 ℃, R 20 Is a direct current wire resistance value at 20 ℃, k e Is the skin effect coefficient;
wherein the wire solar irradiance J considering the error function actual The calculation formula of (2) is as follows:
J actual ＝J avg ×η
in the formula, eta is a sunlight irradiation error coefficient of a grid area range where the transmission line conducting wire i is located; wire wind speed V considering error function speed The calculation formula of (c) is:
V speed ＝a+b×β×V 70
in the formula, a and b are constant coefficients obtained by a regression analysis method according to a wind speed curve in a grid area range where a power transmission line lead i is located, and beta is an uncertainty probability coefficient of the wind speed curve in the grid area range where the power transmission line lead i is located;
setting the wire temperature to an emergency allowable temperature T 2 And calculating the current thermal stability limit value I of the transmission line wire I in the emergency state T2,i ：
Calculating a limit value P of the thermal stability transmission capability of the transmission line wire i in a normal operation state T1,i And the limit value P of the thermal stability transmission capacity of the transmission line wire i in an emergency state T2,i ：
The online calculation result of the transmission capacity of the power transmission line comprises a limit value P of the thermal stability transmission capacity of the wire i of the power transmission line in a normal operation state T1,i And the limit value P of the thermal stability transmission capability of the transmission line wire i in an emergency operation state T2,i 。
Preferably, according to the online calculation result of the transmission capacity of the transmission line, the performing static security check of the power grid comprises:
constructing a simulation section according to the lead information of the limited power transmission section, a power grid regulation and control online model and the online operation data of the limited power transmission section;
checking the new transmission capacity limit value of the limited transmission section based on the simulation section
And
whether the static safety of the power grid of the power transmission line in a normal operation state is met, and whether the out-of-limit condition exists in the equipment under the set of the N-1 fault of the simulation section tidal current analysis whole-network equipment and the preset fault given by the power grid regulation and control operation is checked, wherein m is the number of the wires or the wire clusters contained in the limited power transmission section;
if the checking is unsuccessful, starting the assistant decision calculation to eliminate the out-of-limit condition until the checking result shows that the out-of-limit condition does not exist.
Preferably, the determining a transmission capacity lifting space of the limited transmission section based on the online calculation result of the transmission capacity of the transmission line, setting the number of gears according to an actual condition of regulation and control operation adjustment, and calculating the single gear lifting value corresponding to the number of gears includes:
determining a new transmission capability limit in the normal operating state
Improving the space for the transmission capacity of the limited power transmission section;
and obtaining the value of an error function f (epsilon) according to an error analysis algorithm:
calculating the error weight W of a single gear according to the gear number n ε,i ：
W ε,i ＝f(ε)/n
Calculating the power transmission line from 0 to
Is a single gear shift increase value sigma P afterT1,i ：
Preferably, when the crossing distance is not less than a distance threshold, the online calculation of the transmission capability of the transmission line conductor or the conductor cluster included in the limited transmission section is performed according to the online operation data and the out-of-domain meteorological information, and the obtaining of the online calculation result of the transmission capability of the transmission line includes:
calculating a thermal stability transmission capacity limit value P of the power transmission line wire i in a normal operation state based on the real-time environment temperature of the starting end, the real-time illumination intensity of the starting end, the real-time wind speed of the starting end and the real-time wind direction of the starting end T1,i-1 And the limit value P of the thermal stability transmission capacity of the power transmission line wire i in an emergency state T2,i-1 ；
Calculating the positive state of the transmission line lead i based on the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind directionLimit value P of thermal stability transmission capacity in normal operation state T1,i-2 And the limit value P of the thermal stability transmission capacity of the power transmission line wire i in an emergency state T2,i-2 ；
Determining a limit value P of thermal stability transmission capability of the transmission line conductor i in a normal operation state T1,i Comprises the following steps:
P T1,i ＝min[P T1,i-1 ,P T1,i-2 ]
according to P T1,i Is calculated from P T2,i-1 And P T2,i-2 Selecting and taking out a limit value P of thermal stability transmission capacity of the transmission line wire i in an emergency operation state T2,i The online calculation result of the transmission capacity of the power transmission line comprises a limit value P of the thermal stability transmission capacity of the wire i of the power transmission line in a normal operation state T1,i And the limit value P of the thermal stability transmission capability of the transmission line wire i in an emergency operation state T2,i 。
Further, the invention also provides a power grid transmission section dynamic capacity increase evaluation system based on regional meteorological information, which comprises:
the extraction module is used for extracting the transmission section transmission capacity limited data of the corresponding level power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data;
the selection module selects the limited power transmission section according to the limited data of the transmission capacity of the power transmission section;
the acquisition module is used for acquiring the out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction;
and the analysis module analyzes the transmission capacity promotion space of each limited power transmission section and the corresponding single gear promotion value based on the off-domain meteorological information according to the sequence of the limited degree from high to low.
According to the technical scheme, the power transmission section dynamic capacity increase evaluation method and system based on regional meteorological information can extract the transmission section transmission capacity limited data of a corresponding level power grid according to a regional power grid mode report and an online operation result, select the limited transmission section according to the transmission section transmission capacity limited data, and obtain the out-of-domain meteorological information corresponding to each limited transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction; and analyzing the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value according to the sequence of the limited degree from high to low and based on the meteorological information outside the domain. By the scheme, the dynamic capacity-increasing lifting space of the power transmission line is calculated according to the meteorological information corresponding to the limited power transmission section of the power transmission line, and the transmission capacity of the power transmission line is improved.
Drawings
Fig. 1 is a flowchart of a dynamic capacity-increasing evaluation method for a power transmission section of a power grid based on regional meteorological information.
Fig. 2 is a structural diagram of a dynamic capacity-increasing evaluation system for a power transmission section of a power grid based on regional meteorological information.
Detailed Description
The technical scheme and the technical effect of the invention are further elaborated in the following by combining the drawings of the invention.
As shown in fig. 1, the method for evaluating dynamic capacity increase of a power transmission section of a power grid based on regional meteorological information is specifically implemented by the following steps:
and step S1, extracting the transmission section transmission capacity limited data of the corresponding hierarchical power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data (equipment state change plan, load prediction, unit power generation plan, partition/provincial total exchange plan, direct current line plan data and the like), unit real-time operation data (grid structure real-time topology, voltage and transmission line active power of the regional power grid) and new energy prediction data. The limited transmission section refers to a theoretical transmission section of a power system formed by one or more transmission lines, and the active power transmittable by the section is formed by overlapping each transmission line.
Step S2, selecting out the limited power transmission section according to the limited data of the power transmission section transmission capacity;
step S3, acquiring out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction;
and step S4, analyzing the transmission capacity promotion space of each limited power transmission section and the corresponding single gear promotion value according to the sequence of the limited degree from high to low and based on the out-of-domain meteorological information.
Based on the regional grid meteorological information provided by the meteorological center, the out-of-domain meteorological information is a meteorological data average value of the grid region where the longitude and latitude are located, and the specific operation of the step S3 of obtaining the out-of-domain meteorological information corresponding to each limited power transmission section includes:
step S31, collecting longitude and latitude coordinates of the starting end and longitude and latitude coordinates of the tail end of the transmission line lead or the lead cluster contained in the limited transmission section;
step S32, calculating the crossing distance between the longitude and latitude coordinates of the starting end and the longitude and latitude coordinates of the tail end;
and step S33, when the crossing distance is smaller than the distance threshold, acquiring real-time environment temperature, real-time illumination intensity, real-time wind speed and real-time wind direction corresponding to the longitude and latitude coordinates of the starting end or the longitude and latitude coordinates of the tail end as out-of-domain meteorological information corresponding to the limited power transmission section. The related meteorological information Data of the transmission line conductor is obtained from regional grid meteorological information provided by a meteorological center, and is usually in a Network Common Data format (NetCDF); by extracting longitude, latitude, time, wind speed at 70m high position of grid point, wind direction at 70m high position of grid point, and illumination intensity of grid point from NetCDF, in this embodiment, the real-time ambient temperature refers to an average value T of ambient temperatures aavg The real-time illumination intensity is the average value J of the solar radiation intensity avg The real-time wind speed is the wind speed average value V of the height 70m from the ground 70 A thermally stable transmission capability limit is calculated.
And step S34, when the crossing distance is not less than the distance threshold, acquiring the start end real-time environment temperature, the start end real-time illumination intensity, the start end real-time wind speed and the start end real-time wind direction corresponding to the start end longitude and latitude coordinates, acquiring the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction corresponding to the tail end longitude and latitude coordinates, wherein the out-of-domain meteorological information corresponding to the limited power transmission section comprises the start end real-time environment temperature, the start end real-time illumination intensity, the start end real-time wind speed, the start end real-time wind direction, the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction.
Step S4 is a specific operation of analyzing the transmission capability promotion space of each limited power transmission section and the corresponding single gear promotion value based on the out-of-domain meteorological information in the order of the limited degree from high to low, including:
step S41, calculating the active power transmission limited power of each limited power transmission section in a future state planning mode in real time; performing active power transmission limited rolling analysis on a section to be analyzed in a planning mode, adjusting the section to a certain power flow level according to a preset adjusting mode (namely increasing output or reducing load of a sending end region unit, and reducing output or increasing load of a receiving end region unit), and performing safety and stability checking; and if a stability problem is found, starting auxiliary decision calculation to eliminate out-of-limit until a calculation result does not show that the safety and stability problems are found, wherein the current of the section at the moment is the maximum available transmission power of the power transmission section, and determining the active power transmission limited power of the planning mode by comparing the subtraction of the maximum available transmission power and the new energy output power in the planning mode.
Step S42, sorting in a reverse order from high to low, sorting each limited power transmission section according to the active power transmission limited power of each limited power transmission section, and analyzing each limited power transmission section in sequence according to the sorting result;
step S43, selecting a limited power transmission section, and collecting online operation data of a power transmission line lead or a lead cluster contained in the limited power transmission section;
step S44, performing transmission capacity online calculation on the transmission line lead or the lead cluster contained in the limited transmission section according to the online operation data and the out-of-domain meteorological information to obtain an online calculation result of the transmission capacity of the transmission line;
step S45, performing static security check of the power grid according to the online calculation result of the transmission capacity of the power transmission line;
step S46, determining the transmission capacity lifting space of the limited transmission section based on the transmission capacity online calculation result of the transmission line, setting the gear number according to the actual regulation and control operation adjustment condition, and calculating the single gear lifting value corresponding to the gear number.
Step S44, transmission capacity on-line calculation is carried out on transmission line leads or lead clusters contained in the limited transmission section, namely, a limit value P of thermal stability transmission capacity of the transmission line i in a normal operation state is calculated T1,i And the limit value P of the thermal stability transmission capability of the power transmission line i in the emergency operation state T2,i 。
When the crossing distance is smaller than the distance threshold, the real-time environment temperature obtained according to the above description is the environment temperature average value T aavg The real-time illumination intensity is the average value J of the solar radiation intensity avg The real-time wind speed is the average value V of wind speed 70m away from the ground 70 Calculating the limit value of the thermal stability transmission capacity:
the specific calculation process for carrying out online calculation on the transmission capacity of the transmission line lead or the lead cluster contained in the limited transmission section according to the online operation data and the out-of-domain meteorological information is as follows:
setting the wire temperature to a nominal allowable temperature T 1 And calculating the current thermal stability limit value I of the transmission line wire I in the normal operation state T1,i ：
I 2 R T1 +P s ＝P r +P f (1)
In the formula, P s Is the solar heat absorption power, P r For radiating heat power, P f For convective heat dissipation power, R T1 Is the temperature T of the wire 1 The resistance value of the time alternating current wire, I is the current-carrying capacity of the wire;
radiation heat dissipation power P r The calculation formula of (2) is as follows:
in the formula, D is the diameter of a lead of the transmission line lead, epsilon is the radiation heat dissipation coefficient of the lead, and epsilon belongs to [0.9,0.95 ];
convection heat dissipation power P f The calculation formula of (2) is as follows:
P f ＝λE μ π(T 1 -T aavg ) (3)
R e ＝1.644×10 9 V 70 D[T aavg +0.5(T 1 -T aavg )] -1.78 (5)
in the formula, E μ Is Euler number, R e Is Reynolds number;
solar heat absorption power P s The calculation formula of (2) is as follows:
P s ＝αJ avg D (6)
in the formula, alpha is a heat absorption coefficient of the surface of the wire, wherein the value range of the bright new wire is 0.35-0.46, and the value range of the old wire or the black-coated preservative wire is 0.9-0.95;
wherein R is T1 The calculation formula of (c) is:
R T1 ＝(1+k e )R d (7)
R dT1 ＝R 20 [1+α 20 (T 1 -20)] (8)
in the formula, R dT1 For the temperature of the wire to be T 1 Resistance value of time-dependent DC conductor, alpha 20 Temperature coefficient of wire material at 20 ℃, R 20 Is a direct current wire resistance value at 20 ℃, k e For the skin effect coefficient, corresponding coefficient values are selected from a common skin effect coefficient library, and can be automatically adjusted according to actual conditionsSetting;
wire solar radiation intensity J considering error function actual The calculation formula of (c) is:
J actual ＝J avg ×η (9)
in the formula, eta is a solar irradiation error coefficient of a region range;
wire wind speed V considering error function speed The calculation formula of (2) is as follows:
V speed ＝a+×β×V 70 (10)
in the formula, a and b are constant coefficients obtained by a regression analysis method according to a wind speed curve in a grid area range where a power transmission line lead i is located, and beta is an uncertainty probability coefficient of the wind speed curve in the grid area range where the power transmission line lead i is located;
setting the wire temperature to the emergency allowable temperature T 2 Referring to the above equations 1-11, the current thermal stability limit I of the transmission line conductor I in the emergency state is calculated T2,i ：
Calculating the limit value P of the thermal stability transmission capability of the wire i of the power transmission line in the normal operation state T1,i And a limit value P of thermal stability transmission capability of the transmission line wire i in an emergency state T2,i ：
Wherein, the transmission capability of the transmission line is calculated on lineComprises a limit value P of the thermal stability transmission capability of a transmission line wire i in a normal operation state T1,i And the limit value P of the thermal stability transmission capability of the transmission line wire i in the emergency operation state T2,i 。
When the crossing distance is not less than the distance threshold, respectively calculating the limit value of the thermal stability transmission capability according to the out-of-domain meteorological information corresponding to the longitude and latitude coordinates of the starting end and the out-of-domain meteorological information corresponding to the longitude and latitude coordinates of the tail end to obtain the limit value P of the thermal stability transmission capability of the power transmission line i based on the coordinates of the starting end in the normal operation state T1,i-1 And a limit value P of thermal stability transmission capability of the transmission line wire i in an emergency state T2,i-1 And a limit value P of the thermal stability transmission capability of the power transmission line i in a normal operation state based on the terminal coordinates T1,i-2 And a limit value P of thermal stability transmission capability of the transmission line wire i in an emergency state T2,i-2 Then from P T1,i-1 And P T1,i-2 The minimum value is selected as the calculation of the above-mentioned sigma P T1,i The limit value of the thermal stability transmission capability in the emergency state with the same latitude coordinate is taken as the limit value P of the thermal stability transmission capability of the transmission line wire i in the emergency state T2,i 。
Step S45, according to the online calculation result of the transmission capability of the transmission line, the specific implementation of performing the static security check of the power grid includes:
constructing a simulation section according to the lead information of the limited power transmission section, the power grid regulation and control online model and the online operation data of the limited power transmission section;
checking new transmission capacity limit value of limited transmission section based on simulation section
And
whether the static safety of a power grid in the normal operation state of the power transmission line is met, and whether the out-of-limit condition exists in the equipment under the set of the N-1 fault of the whole-network equipment for checking the flow analysis of the simulated section and the preset fault given by the regulation and control operation of the power grid, wherein m is the condition that m is the limited power transmission sectionThe number of wires or wire clusters;
if the checking is unsuccessful, starting the assistant decision calculation to eliminate the out-of-limit condition until the checking result is that the out-of-limit condition does not exist.
Step S46 is to determine the transmission capacity lifting space of the limited transmission section based on the transmission capacity online calculation result of the transmission line, set the number of gears according to the actual condition of regulation and control operation adjustment, and calculate the single gear lifting value corresponding to the number of gears including:
determining new transmission capacity limit in normal operation
The space is increased for the transmission capacity of the limited power transmission section;
and obtaining the value of an error function f (epsilon) according to an error analysis algorithm:
calculating the error weight W of a single gear according to the number n of gears ε,i ：
W ε,i ＝f(ε)/n (16)
Calculating the power transmission line from 0 to
By a single gear shift increase value sigma P afterT1,i ：
The obtained calculation parameters, the lifting space and the single gear lifting value sigma P afterT1,i The data can be visually displayed through a computer, and the single gear lifting value sigma P is displayed in a table or graph mode afterT1,i The effect of (2) is improved.
Further, the invention also provides a power grid transmission section dynamic capacity-increasing evaluation system based on regional meteorological information, which is characterized by comprising the following steps:
the extraction module is used for extracting the transmission section transmission capacity limited data of the corresponding level power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data; the detailed implementation refers to the aforementioned step S1.
The selection module selects the limited power transmission section according to the limited data of the transmission capacity of the power transmission section; the detailed implementation refers to the aforementioned step S2.
The acquisition module is used for acquiring the out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction; for specific implementation, refer to the foregoing steps S31-S34.
And the analysis module analyzes the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value based on the off-domain meteorological information according to the sequence of the limited degree from high to low. For specific implementation, refer to the foregoing steps S41-S46.
The structure of the system can be seen in fig. 2, the transmission capacity of a line or a line cluster of a key power transmission stability limited section is analyzed by combining lead information, regional weather, power grid plan and operation data, the limited section panoramic perception is realized by adopting targeted regional meteorological data, the investment of power transmission line monitoring equipment is simplified on the basis of guaranteeing the accuracy and timeliness of information such as limited section analysis, key section tracking and limitation promotion analysis, and the potential of the existing power grid regulation and control equipment and internal and external data is effectively exploited. The system provided by the invention breaks through the limitation of the traditional application of the microclimate data based on the power transmission line in the large power grid, performs capacity increase analysis and safety evaluation from the perspective of the whole power grid, and improves the practicability of dynamic capacity increase.
The method fully considers the requirement of the regulation and control system on the safety of the power grid, and calculates the acquired data by utilizing the relevance between the internal and external various data and the continuity between the real-time data and the historical data, thereby ensuring the safety of the power grid and better conforming to the use habit of the regulation and control system; core modules of a regulation and control system scheduling plan, load flow calculation, static safety analysis and the like are utilized to analyze dynamic capacity increase of the power grid, the necessity and feasibility of capacity increase are judged, and technical support is provided for a dispatcher to drive the power grid; and evaluating and analyzing the dynamic capacity increasing process from the two aspects of line capacity and power grid safety, and ensuring the safety of dynamic capacity increasing.
According to the invention, under the conditions of complying with the temperature limit regulation of the lead and not changing the current situation of the power grid, the problem of limited power transmission section is solved flexibly, new energy consumption is facilitated, the dynamic and lean management levels of the thermal stability limit of the power transmission equipment are promoted, and real-time and visual real-time information support is provided for optimizing the operation mode and perfecting the power grid emergency strategy.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A dynamic capacity-increasing assessment method for a power transmission section of a power grid based on regional meteorological information is characterized by comprising the following steps: extracting transmission section transmission capacity limited data of a corresponding level power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data;
selecting out the limited power transmission section according to the data with limited power transmission section transmission capacity;
acquiring out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction;
and analyzing the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value based on the out-of-domain meteorological information according to the sequence of the limited degree from high to low.
2. The method for dynamically increasing capacity of a power transmission section of a power grid based on regional meteorological information according to claim 1, wherein the regional power grid operation mode scheduling plan data comprises equipment state change plan, load prediction, unit power generation plan, zoning/provincial total exchange plan and direct current line plan data, and the unit real-time operation data comprises grid structure real-time topology of the regional power grid, regional power grid voltage and regional power grid active power.
3. The method for dynamically increasing capacity of power transmission sections of a power grid based on regional meteorological information according to claim 2, wherein the obtaining the off-grid meteorological information corresponding to each limited power transmission section comprises, based on regional grid meteorological information provided by a meteorological center, the off-grid meteorological information being an average value of meteorological data of grid areas according to longitude and latitude:
collecting longitude and latitude coordinates of a starting end and longitude and latitude coordinates of a power transmission line lead or a lead cluster contained in the limited power transmission section;
calculating the spanning distance between the longitude and latitude coordinates of the starting end and the longitude and latitude coordinates of the tail end;
when the crossing distance is smaller than a distance threshold value, acquiring the real-time environment temperature, the real-time illumination intensity, the real-time wind speed and the real-time wind direction corresponding to the longitude and latitude coordinates of the starting end or the longitude and latitude coordinates of the tail end as out-of-domain meteorological information corresponding to the limited power transmission section; the real-time environment temperature refers to the average value T of the environment temperature aavg The real-time illumination intensity refers to the average value J of the solar radiation intensity avg The real-time wind speed refers to the wind speed average value V at a height of 70m from the ground 70 ；
When the crossing distance is not less than a distance threshold value, acquiring the start end real-time environment temperature, start end real-time illumination intensity, start end real-time wind speed and start end real-time wind direction corresponding to the start end longitude and latitude coordinates, and acquiring the tail end real-time environment temperature, tail end real-time illumination intensity, tail end real-time wind speed and tail end real-time wind direction corresponding to the tail end longitude and latitude coordinates, wherein the out-of-domain meteorological information corresponding to the limited power transmission section comprises the start end real-time environment temperature, the start end real-time illumination intensity, the start end real-time wind speed, the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction.
4. The method for dynamic capacity-increase assessment of power transmission sections of a power grid based on regional meteorological information as claimed in claim 3, wherein the analyzing transmission capability elevation spaces and corresponding individual gear elevation values of each of the limited power transmission sections based on the out-of-domain meteorological information in the order of the limited degree from high to low comprises: calculating the active power transmission limited power of each limited power transmission section in a future state planning mode in real time; according to the sequence from high to low, the limited power is transmitted according to the active power of each limited power transmission section, and each limited power transmission section is sequentially analyzed according to the sequencing result;
selecting one limited power transmission section, and collecting online operation data of a power transmission line lead or a lead cluster contained in the limited power transmission section;
according to the online operation data and the out-of-domain meteorological information, online calculation of transmission capacity is carried out on transmission line leads or lead clusters contained in the limited transmission section, and an online calculation result of the transmission capacity of the transmission line is obtained;
performing static security check of the power grid according to the online calculation result of the transmission capacity of the power transmission line;
and determining a transmission capacity lifting space of the limited transmission section based on the online calculation result of the transmission capacity of the transmission line, setting the number of gears according to the actual regulation and control operation adjustment condition, and calculating the single gear lifting value corresponding to the number of gears.
5. The method for dynamically increasing capacity of a power transmission section of a power grid based on regional meteorological information according to claim 4, wherein when the spanning distance is less than a distance threshold, the online calculation of the transmission capacity of the transmission line conductor or the conductor cluster included in the limited power transmission section according to the online operation data and the out-of-domain meteorological information is performed, and the obtaining of the online calculation result of the transmission capacity of the transmission line comprises:
setting the wire temperature to a nominal allowable temperature T 1 And calculating the current thermal stability limit value I of the transmission line conductor I in the normal running state T1,i ：
I 2 R T1 +P s ＝P r +P f
In the formula, P s For solar heat absorption power, P r For radiating heat power, P f For convective heat dissipation power, R T1 Is the temperature T of the wire 1 The resistance value of the time alternating current wire, I is the current-carrying capacity of the wire;
wherein the radiation heat dissipation power P r The calculation formula of (2) is as follows:
in the formula, D is the diameter of the lead, epsilon is the radiation heat dissipation coefficient of the lead, epsilon belongs to [0.9,0.95 ];
wherein, the convection heat dissipation power P f The calculation formula of (2) is as follows:
P f ＝λE μ π(T 1 -T aavg )
R e ＝1.644×10 9 V 70 D[T aavg +0.5(T 1 -T aavg )] -1.78
in the formula, E μ Is Euler number, R e Is Reynolds number;
wherein the solar heat absorption power P s The calculation formula of (c) is:
P s ＝αJ avg D
in the formula, alpha is a heat absorption coefficient of the surface of the lead, wherein the value range of the bright new line is 0.35-0.46, and the value range of the old line or the black preservative-coated line is 0.9-0.95;
wherein R is T1 The calculation formula of (2) is as follows:
R T1 ＝(1+k e )R d
R dT1 ＝R 20 [1+α 20 (T 1 -20)]
in the formula, R dT1 For the temperature of the wire to be T 1 Resistance value of time-dependent DC conductor, alpha 20 A temperature coefficient of the wire material at 20 ℃, R 20 Is a direct current wire resistance value at 20℃, k e Is the skin effect coefficient;
wherein the wire solar irradiance J considering the error function actual The calculation formula of (2) is as follows:
J actual ＝J avg ×η
in the formula, eta is a sunlight irradiation error coefficient of a grid area range where the electric transmission line lead i is located;
wire wind speed V considering error function speed The calculation formula of (2) is as follows:
V speed ＝a+b×β×V 70
in the formula, a and b are constant coefficients obtained by a regression analysis method according to a wind speed curve in a grid area range where the power transmission line lead i is located, and beta is an uncertainty probability coefficient of the wind speed curve in the grid area range where the power transmission line lead i is located;
setting the wire temperature to an emergency allowable temperature T 2 And calculating the current thermal stability limit value I of the transmission line wire I in the emergency state T2,i ：
Calculating the limit value P of the thermal stability transmission capability of the wire i of the power transmission line in the normal running state T1,i And the limit value P of the thermal stability transmission capacity of the transmission line wire i in an emergency state T2,i ：
The online calculation result of the transmission capacity of the power transmission line comprises a limit value P of the thermal stability transmission capacity of the wire i of the power transmission line in a normal operation state T1,i And the limit value P of the thermal stability transmission capability of the transmission line wire i in an emergency operation state T2,i 。
6. The method for dynamically increasing capacity of a power transmission section of a power grid based on regional meteorological information according to claim 5, wherein the performing static security check of the power grid according to the online calculation result of the transmission capability of the power transmission line comprises:
constructing a simulation section according to the lead information of the limited power transmission section, a power grid regulation and control online model and the online operation data of the limited power transmission section;
checking the new transmission capacity limit value of the limited transmission section based on the simulation section
And
whether the static safety of the power grid of the power transmission line in the normal operation state is met or not and checking the tidal current of the simulated sectionAnalyzing whether the out-of-limit condition exists in the equipment under the set of the N-1 fault of the whole network equipment and the preset fault given by the regulation and control operation of the power grid, wherein m is the number of the leads or the lead clusters contained in the limited power transmission section;
if the checking is unsuccessful, starting the assistant decision calculation to eliminate the out-of-limit condition until the checking result shows that the out-of-limit condition does not exist.
7. The method for dynamic capacity-increase assessment of a power transmission section of a power grid based on regional meteorological information as claimed in claim 6, wherein the determining a transmission capacity lifting space of the limited power transmission section based on the online calculation result of the transmission capacity of the power transmission line, setting a gear number according to a regulation operation adjustment practical situation, and calculating the single gear lifting value corresponding to the gear number comprises:
determining a new transmission capability limit in the normal operating state
Improving the space for the transmission capacity of the limited power transmission section;
and obtaining the value of an error function f (epsilon) according to an error analysis algorithm:
calculating the error weight W of a single gear according to the gear number n ε,i ：
W ε,i ＝f(ε)/n
Calculating the power transmission line from 0 to
Is a single gear shift increase value sigma P afterT1,i ：
8. The method for dynamically increasing capacity of a power transmission section of a power grid based on regional meteorological information according to claim 7, wherein when the spanning distance is not less than a distance threshold, the performing transmission capacity online calculation on the transmission line conductor or the conductor cluster included in the limited power transmission section according to the online operation data and the extraterritorial meteorological information, and obtaining an online calculation result of the transmission capacity of the transmission line comprises:
calculating a thermal stability transmission capacity limit value P of the power transmission line wire i in a normal operation state based on the real-time environment temperature of the starting end, the real-time illumination intensity of the starting end, the real-time wind speed of the starting end and the real-time wind direction of the starting end T1,i-1 And the limit value P of the thermal stability transmission capacity of the transmission line wire i in an emergency state T2,i-1 ；
Calculating a limit value P of the thermal stability transmission capability of the power transmission line lead i in a normal operation state based on the tail end real-time environment temperature, the tail end real-time illumination intensity, the tail end real-time wind speed and the tail end real-time wind direction T1,i-2 And the limit value P of the thermal stability transmission capacity of the power transmission line wire i in an emergency state T2,i-2 ；
Determining a limit value P of thermal stability transmission capability of the transmission line conductor i in a normal operation state T1,i Comprises the following steps:
P T1,i ＝min[P T1,i-1 ,P T1,i-2 ]
according to P T1,i Is calculated from P T2,i-1 And P T2,i-2 Selecting the limit value P of the thermal stability transmission capability of the transmission line conductor i in the emergency running state T2,i The online calculation result of the transmission capability of the power transmission line comprises a limit value P of the thermal stability transmission capability of the wire i of the power transmission line in a normal running state T1,i And the limit value P of the thermal stability transmission capability of the transmission line wire i in an emergency operation state T2,i 。
9. A power grid transmission section dynamic capacity-increasing evaluation system based on regional meteorological information is characterized by comprising: the extraction module is used for extracting the transmission section transmission capacity limited data of the corresponding level power grid according to the regional power grid mode report and the online operation result, wherein the transmission section transmission capacity limited data comprise regional power grid operation mode scheduling plan data, unit real-time operation data and new energy prediction data;
the selection module selects the limited power transmission section according to the limited data of the transmission capacity of the power transmission section;
the acquisition module is used for acquiring out-of-domain meteorological information corresponding to each limited power transmission section, wherein the out-of-domain meteorological information comprises real-time environment temperature, real-time sunlight intensity, real-time wind speed and real-time wind direction;
and the analysis module analyzes the transmission capacity promotion space of each limited power transmission section and a corresponding single gear promotion value based on the out-of-domain meteorological information according to the sequence of the limited degree from high to low.
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Effective date of registration: 20230714 Address after: No. 716, Huanghe East Road, Jinfeng District, Yinchuan City, Ningxia Hui Autonomous Region Applicant after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER Co.,Ltd. Applicant after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: STATE GRID NINGXIA ELECTRIC POWER Co.,Ltd. Address before: 750002, No. 716, the Yellow River East Road, Jinfeng District, the Ningxia Hui Autonomous Region, Yinchuan Applicant before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER Co.,Ltd. Applicant before: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. |