CN106845143B - Method and system for improving line estimation value on SCADA system - Google Patents

Method and system for improving line estimation value on SCADA system Download PDF

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CN106845143B
CN106845143B CN201710145626.5A CN201710145626A CN106845143B CN 106845143 B CN106845143 B CN 106845143B CN 201710145626 A CN201710145626 A CN 201710145626A CN 106845143 B CN106845143 B CN 106845143B
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route
line
value
voltage
last end
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CN106845143A (en
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张宗包
黄颖祺
李艳
江伟
郝蛟
刘岩
杜进桥
赵晶玲
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Shenzhen Power Supply Co ltd
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Abstract

The invention provides a method for improving an estimated value of a line on an SCADA system, which comprises the steps of obtaining actual measurement data of the SCADA under the current power grid topological structure, obtaining impedance of each line, estimating each line by taking the impedance of each line as an estimation parameter respectively, and calculating the estimated value of each line; the SCADA actual measurement data is obtained by actually measuring the voltage and phase of each node and the power of each line through the SCADA; and determining the voltage grade of each line, adjusting the voltage per unit value of the head end and the tail end of each line, correcting the impedance of each line according to the estimated value of each line and the adjusted voltage per unit value of the head end and the tail end of each line, setting the impedance of each line as an estimation parameter again, and estimating each line again to obtain the estimated value of each line after re-estimation. The invention can simultaneously correct the network topology errors and the parameter errors to improve the estimated value of the SCADA system and distinguish according to different voltage levels, and has stronger theoretical basis and higher engineering practical value.

Description

One kind is for route estimated value improved method and system in SCADA system
Technical field
The present invention relates to electrical network parameter estimating techniques fields, more particularly to one kind is for route estimated value in SCADA system Improved method and system.
Background technique
Modern energy management systems (Energy Management System, abbreviation EMS) are to utilize electrical network parameter and institute Collected real time information analyzed, is assessed and decision, and a critical function among it just includes state estimation. Due to not having measured data, so that EMS generallys use the theoretical value of electrical network parameter or empirical value is calculated, but there are various Reason causes these parameters usually cannot in time and correctly safeguard, it is real to become long-standing problem EMS so as to cause parameter error With a problem of change, the serious state estimation that reduces causes the subsequent advanced analysis of EMS and determines in the computational accuracy of regional area Plan result does not meet actual conditions, and the functionization for further influencing EMS is horizontal.
In order to obtain satisfied and accurate quantity of state estimated value, be required there are two condition: the first, measurement not only exists To meet the requirement of estimation in quantity and in accuracy；The second, estimation object, that is, network model must be accurate.
But due to the complexity of network model, i.e., includes not only network topology structure, further includes network paramter models, And parameter model can be divided into the angle etc. of line admittance, shunt capacitance, transformer tap positions and phase shifter, therefore On the one hand, network model in the state estimation procedure of EMS, there are the accuracys that the factor of two aspects influences estimated result: Although topological structure is known, but more or less there is also some errors；On the other hand, there are different mistakes for network parameter Difference (such as directlyed adopt because lacking actual measurement parameter amount design parameter or parameter measurement condition and actual motion condition difference compared with Greatly, the component parameters in given parameter value and actual motion is made to have difference；For another example the component parameters in actual motion because relocating, Reconstruction, or changed because of reasons such as environmental changes, but the parameter of corresponding element does not obtain in time in database Update；For another example control centre grasps the tap joint position of running automatic powerstat inaccurate etc.), these The performance that all will lead to state estimation declines to a great extent, and directly affects the analytic function of subsequent software, and resulting even in EMS sending has Harmful control action influences the normal safe operation of electric system.And influence of the different parameter errors for state estimation It is different.
It is widely used in electric system in view of SCADA system, the running equipment at scene can be monitored and be controlled, To realize the various functions such as data acquisition, equipment control, measurement, parameter regulation and various types of signal alarm, i.e., such as " four is distant " function Energy, RTU (remote-terminal unit), FTU (ca bin) etc. have played phase in integrated automation of transformation stations construction now Work as important role, therefore carry out state estimation in EMS based on SCADA system to be necessary.
However, the line parameter circuit value estimation currently based on SCADA system is to carry out parameter Estimation by equation redundancy, deposit The problem of the parameter estimation result for being difficult to measure estimated accuracy and different routes influences each other.Meanwhile the mistake of line parameter circuit value Accidentally mainly as caused by the variation of the mistake of network topology and component parameters, and the mistake of network topology is big corresponding to one Parameter error (such as remote signalling fades to disconnection by closing a floodgate, then correspond to element admittances value faded to zero) by nominal parameter.Moreover, previous Correlative study in do not discussed and be distinguish by different voltages grade.Therefore, it is necessary to can be with using this feature It will be combined and be estimated with parameter error by power system network Topology Error, and be distinguish by different voltages grade.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of for route estimated value in SCADA system Improved method and system, energy while corrective networks Topology Error and parameter error are to improve the estimated value of SCADA system and by not It is distinguished with voltage class, there is stronger theoretical basis and higher engineering practical value.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides one kind for route estimated value in SCADA system Improved method, which comprises
A, SCADA measured data under current electric grid topological structure is obtained, and number is surveyed according to the SCADA got According to obtaining each line impedance in the current electric grid topological structure, and be further respectively with obtained each line impedance Estimation parameter estimates each route, calculates each line estimation value；Wherein, the SCADA measured data is to pass through SCADA It surveys each node voltage and phase and each line power in the current electric grid topological structure and obtains；
B, each line voltage distribution grade in the current electric grid topological structure is determined, and according to each line voltage distribution of the determination Grade adjusts each route head terminal voltage per unit value, and according to calculated each line estimation value and the adjustment after Each route head terminal voltage per unit value, correct each line impedance, further divide revised each line impedance again Each route is estimated again after not being set as estimation parameter, obtains the estimated value after each route re-evaluates.
Wherein, the step a is specifically included:
It determines the node and route of current electric grid topological structure, and surveys to obtain each node voltage amplitude, each by SCADA Node voltage phase place value, each route first and last end active power and each route first and last end reactive power；
According to each node voltage amplitude, each node voltage phase place value, each route first and last end wattful power surveyed and obtained Rate and each route first and last end reactive power calculate each line impedance, and are respectively to estimate with calculated each line impedance Parameter is calculated, each line Phases estimated value, the idle function of each route first and last end active power estimated value and each route first and last end are calculated Rate estimated value.
Wherein, the step b is specifically included:
It is surveyed to obtain each node voltage amplitude according to the SCADA, determines each route head terminal voltage per unit value, and according to Each line voltage distribution grade adjusts each route head terminal voltage per unit value；Wherein, the voltage class include 110kV, 220kV and 500kV；It is 110kV or 220kV pairs by determined voltage class when determining a certain line voltage distribution grade is 110kV or 220kV Route head terminal voltage per unit value is answered to remain unchanged；When determining a certain line voltage distribution grade is 500kV, by determined voltage etc. Grade is that 500kV corresponding line head terminal voltage per unit value is disposed as 1；
According to each route head terminal voltage per unit value adjusted and calculated each line Phases estimation Value, each route first and last end active power estimated value and each route first and last end reactive power estimated value obtain each line reactance adjustment Amount and its corresponding susceptance adjustment amount；
According to obtained each line reactance adjustment amount and its corresponding susceptance adjustment amount and the calculated route Impedance corrects each line impedance, and revised each line impedance is obtained each route respectively again as estimation parameter The revised first and last end active power estimated value of revised phase estimation value, each route and the revised first and last end of each route without Function power estimation value.
The embodiment of the invention also provides one kind to improve system, the system packet for route estimated value in SCADA system It includes:
Evaluation unit of route, is obtained for obtaining SCADA measured data under current electric grid topological structure, and according to described The SCADA measured data got obtains each line impedance in the current electric grid topological structure, and is further obtained with described Each line impedance is respectively to estimate that parameter estimates each route, calculates each line estimation value；Wherein, the SCADA is real Measured data is to survey each node voltage and phase and each line power in the current electric grid topological structure by SCADA to obtain ?；
Route re-evaluates unit, for determining each line voltage distribution grade in the current electric grid topological structure, and according to Each line voltage distribution grade of the determination adjusts each route head terminal voltage per unit value, and according to calculated each route Estimated value and each route head terminal voltage per unit value adjusted, correct each line impedance, further by the amendment Each line impedance afterwards again estimates each route after being set to estimation parameter again, obtains after each route re-evaluates Estimated value.
Wherein, evaluation unit of the route includes:
Data acquisition module for determining the node and route of current electric grid topological structure, and surveys to obtain by SCADA Each node voltage amplitude, each node voltage phase place value, each route first and last end active power and each route first and last end reactive power；
Estimation block of route, for surveying obtained each node voltage amplitude, each node voltage phase place according to described Value, each route first and last end active power and each route first and last end reactive power, calculate each line impedance, and calculate with described Each line impedance be respectively estimate parameter, calculate each line Phases estimated value, each route first and last end active power estimated value With each route first and last end reactive power estimated value.
Wherein, the route re-evaluates unit and includes:
Voltage distinguishes adjustment module, obtains each node voltage amplitude for surveying according to the SCADA, determines that each route is first Terminal voltage per unit value, and according to each line voltage distribution grade, adjust each route head terminal voltage per unit value；Wherein, the voltage Grade includes 110kV, 220kV and 500kV；When determining a certain line voltage distribution grade is 110kV or 220kV, electricity will be determined Pressure grade is that 110kV or 220kV corresponding line head terminal voltage per unit value remains unchanged；When determining that a certain line voltage distribution grade is It is that 500kV corresponding line head terminal voltage per unit value is disposed as 1 by determined voltage class when 500kV；
Adjustment amount obtains module, for according to each route head terminal voltage per unit value adjusted and the calculating Each line Phases estimated value, each route first and last end active power estimated value and each route first and last end reactive power estimated value out, Obtain each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Route re-evaluates module, adjusts for each line reactance adjustment amount obtained according to and its corresponding susceptance Amount and the calculated line impedance, correct each line impedance, and revised each line impedance is made again respectively For estimate parameter, obtain the revised first and last end active power estimated value of the revised phase estimation value of each route, each route and Each revised first and last end reactive power estimated value of route.
The implementation of the embodiments of the present invention has the following beneficial effects:
The embodiment of the present invention is based on SCADA measured data and is modified to line impedance, binding member parameter (such as each node Voltage magnitude and phase value) and line parameter circuit value (such as route first and last end active power and reactive power) Lai Gaijin line estimation value, It is distinguished (such as 110kV, 220kV and 500kV) by different voltages grade, to reduce the redundancy of parameter, is overcome not With influencing each other between the parameter estimation result of route, estimated accuracy is improved, there is stronger theoretical basis and higher Engineering practical value.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention, for those of ordinary skill in the art, without any creative labor, according to These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is a kind of flow chart of the route estimated value improved method in SCADA system provided in an embodiment of the present invention；
Fig. 2 is that one kind provided in an embodiment of the present invention is opened up for power grid in route estimated value improved method in SCADA system Flutter the application scenario diagram of structure；
Fig. 3 is that the structure that a kind of route estimated value in SCADA system provided in an embodiment of the present invention improves system is shown It is intended to.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing Step ground detailed description.
As shown in Figure 1, the one kind provided is for route estimated value improvement side in SCADA system in the embodiment of the present invention Method, which comprises
Step S1, SCADA measured data under current electric grid topological structure is obtained, and real according to the SCADA got Measured data obtains each line impedance in the current electric grid topological structure, and further with obtained each line impedance point It Wei not estimate that parameter estimates each route, calculates each line estimation value；Wherein, the SCADA measured data is to pass through SCADA surveys each node voltage and phase and each line power in the current electric grid topological structure and obtains；
Detailed process is the node and route for determining current electric grid topological structure, and surveys to obtain each node by SCADA Voltage magnitude, each node voltage phase place value, each route first and last end active power and each route first and last end reactive power；
According to actual measurement obtain each node voltage amplitude, each node voltage phase place value, each route first and last end active power and Each route first and last end reactive power calculates each line impedance, and is respectively to estimate parameter with calculated each line impedance, meter Calculate each line Phases estimated value, each route first and last end active power estimated value and each route first and last end reactive power estimated value.
Step S2, each line voltage distribution grade in the current electric grid topological structure is determined, and according to each line of the determination Road voltage class, adjusts each route head terminal voltage per unit value, and according to calculated each line estimation value and described Each route head terminal voltage per unit value adjusted, corrects each line impedance, further by revised each line impedance Each route is estimated again after being set to estimation parameter again, obtains the estimated value after each route re-evaluates.
Detailed process is to be surveyed to obtain each node voltage amplitude according to SCADA, determines each route head terminal voltage mark Value, and according to each line voltage distribution grade, adjust each route head terminal voltage per unit value；Wherein, voltage class include 110kV, 220kV and 500kV；When determining a certain line voltage distribution grade is 110kV or 220kV, by determined voltage class for 110kV or 220kV corresponding line head terminal voltage per unit value remains unchanged；When determine a certain line voltage distribution grade be 500kV when, by really Constant voltage grade is that 500kV corresponding line head terminal voltage per unit value is disposed as 1；
According to each route head terminal voltage per unit value adjusted and calculated each line Phases estimated value, each route First and last end active power estimated value and each route first and last end reactive power estimated value, obtain each line reactance adjustment amount and its correspondence Susceptance adjustment amount；
According to obtained each line reactance adjustment amount and its corresponding susceptance adjustment amount and calculated line impedance, amendment Each line impedance, and revised each line impedance is obtained into the revised phase of each route respectively again as estimation parameter The revised first and last end active power estimated value of estimated value, each route and the revised first and last end reactive power estimation of each route Value.
In embodiments of the present invention, it is assumed that phase estimation value, first and last end active power and first and last end in state estimation result The departure of reactive power is since line impedance parameter (reactance and susceptance) causes, in order to eliminate departure to state estimation As a result influence needs to be adjusted the line impedance parameter of use.
Firstly, for 220kV and 110kV route, using formula (1) and (2) calculating reactance adjustment amount and susceptance adjustment amount, It is specific as follows:
In formula (1) and (2),WithThe respectively conductance of 220kV route ij, susceptance adjustment amount；WithThe respectively conductance of 110kV route ij, susceptance adjustment amount；vi,vjFor route ij first and last end node voltage per unit value；θijFor Route ij first and last end node voltage phase difference；ΔPij、ΔPji、ΔQij、ΔQjiExpression formula it is as follows:
In formula (3),WithRespectively route ij first and end active power measuring value；WithRespectively route ij First and end reactive power measuring value；WithRespectively route ij first and end active power estimated value；WithRespectively Route ij first and end reactive power estimated value.
Secondly, for 500kV route, due to voltage class height, each node voltage per unit value all close to 1 and difference not Greatly, v is taken thus in formula (1) and (2)i=vj=1, adjustment amount is calculated using formula (4) and (5), specific as follows:
In formula (4) and (5),WithThe respectively conductance of 500kV route ij, susceptance adjustment amount；θijFor route ij Both ends node voltage phase place is poor；ΔPij、ΔPji、ΔQij、ΔQjiExpression formula it is identical as formula (3).
In embodiments of the present invention, calculating is modified to the original impedance of each route using formula (6), amendment is calculated Each line impedance afterwards, specific as follows:
In formula (6),For the revised impedance of route ij, ZijFor the original impedance of route ij, Δ gijFor by formula (1) or The calculated route ij conductance adjustment amount of formula (4), Δ bijTo pass through formula (2) or the calculated route ij susceptance adjustment amount of formula (5).
As shown in Fig. 2, being used for SCADA system to one of embodiment of the present invention using 9 node modular system of IEEE3 machine The application scenarios of upper route estimated value improved method are described further, and are specifically illustrated by taking route 4-5 as an example:
The first step, by RTU obtain related SCADA measured data it is as shown in table 1 below:
Table 1:
Measuring point P45 Q45 P54 Q54 V4 V5
Measuring value (p.u.) 0.307283 -0.005859 0.305547 0.136880 0.9870 0.9755
It should be noted that measuring value (p.u.) is all the per unit value after corresponding measured data conversion.
By the related data of table 1, the impedance in the database that can calculate route 4-5 is Z45=(0.005+ J0.138) Ω, and be that estimation parameter carries out state estimation using route 4-5 impedance, the line of route 4-5 is obtained after state estimation Road trend and phase angle, i.e. route 4-5 line Phases estimated value, route 4-5 first and last end active power estimated value and route 4-5 first and last Reactive power estimated value is held, shown in table 2 specific as follows:
Table 2
Measuring point P’45 Q’45 P’54 Q’54 θ45
Estimated value (p.u.) 0.286608 0.002389 0.286154 0.141899 2.3322
Deviation ratio (%) 6.74 139.96 6.35 3.65 ——
At this point, deviation ratio is calculated by the estimated value of table 2 and the measuring value of table 1.
Second step calculates route 4-5 impedance parameter (reactance and susceptance) adjustment amount, and steps are as follows:
The voltage class for determining route 4-5 is 110kV, asks estimation front and back Line Flow departure, Δ P45=0.307283- 0.286608=0.0207, Δ Q45=-0.005859-0.002389=-0.0082, Δ P54=0.305547-0.286154= 0.0194, Δ Q54=0.136880-0.141899=-0.0050；
And bring Line Flow departure in formula (1) and (2) into, acquire Δ g45=1.5995, Δ b45=-3.1508；
Third step, according to formula (6), correct route 4-5 impedance, i.e.,
Z/ 45=1/ (1/Z45+Δg45+Δb45)=(0.0167+j0.0933) Ω；
At this time using the parameter Z after estimation/ 45It carries out estimating to obtain, shown in table 3 specific as follows:
Table 3
Measuring point P”45 Q”45 P”54 Q”54 θ45
Estimated value (p.u.) 0.306670 -0.005601 0.304971 0.137034 1.6321
Deviation ratio (%) 0.2 4.4 0.19 0.11 ——
It can be seen that state estimation accuracy is remarkably improved after amendment impedance parameter.
As shown in figure 3, the one kind provided improves system for route estimated value in SCADA system in the embodiment of the present invention System, the system comprises:
Evaluation unit 110 of route, for obtaining SCADA measured data under current electric grid topological structure, and according to institute The SCADA measured data got is stated, each line impedance in the current electric grid topological structure is obtained, and is further obtained with described To each line impedance be respectively estimate parameter each route is estimated, calculate each line estimation value；Wherein, described SCADA measured data is that each node voltage and phase and each route in the current electric grid topological structure are surveyed by SCADA Power and obtain；
Route re-evaluates unit 120, for determining each line voltage distribution grade in the current electric grid topological structure, and root According to each line voltage distribution grade of the determination, each route head terminal voltage per unit value is adjusted, and according to calculated each line Road estimated value and each route head terminal voltage per unit value adjusted, correct each line impedance, further repair described Each line impedance after just again estimates each route after being set to estimation parameter again, obtains each route and re-evaluates Estimated value afterwards.
Wherein, evaluation unit 110 of the route includes:
Data acquisition module 1101 is surveyed for determining the node and route of current electric grid topological structure, and by SCADA Obtain each node voltage amplitude, each node voltage phase place value, the idle function of each route first and last end active power and each route first and last end Rate；
Estimation block 1102 of route, for surveying obtained each node voltage amplitude, each node voltage according to described Phase value, each route first and last end active power and each route first and last end reactive power, calculate each line impedance, and in terms of described Each line impedance calculated is respectively to estimate parameter, calculates each line Phases estimated value, each route first and last end active power is estimated Evaluation and each route first and last end reactive power estimated value.
Wherein, the route re-evaluates unit 120 and includes:
Voltage distinguishes adjustment module 1201, obtains each node voltage amplitude for surveying according to the SCADA, determines each line Road head terminal voltage per unit value, and according to each line voltage distribution grade, adjust each route head terminal voltage per unit value；Wherein, described Voltage class includes 110kV, 220kV and 500kV；When determine a certain line voltage distribution grade be 110kV or 220kV when, by really Constant voltage grade is that 110kV or 220kV corresponding line head terminal voltage per unit value remains unchanged；When determining a certain line voltage distribution etc. It is that 500kV corresponding line head terminal voltage per unit value is disposed as 1 by determined voltage class when grade is 500kV；
Adjustment amount obtains module 1202, for according to each route head terminal voltage per unit value adjusted and described Calculated each line Phases estimated value, each route first and last end active power estimated value and the estimation of each route first and last end reactive power Value, obtains each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Route re-evaluates module 1203, for each line reactance adjustment amount obtained according to and its corresponding susceptance Adjustment amount and the calculated line impedance correct each line impedance, and again by revised each line impedance difference It is secondary to be used as estimation parameter, obtain the revised first and last end active power estimation of the revised phase estimation value of each route, each route Value and the revised first and last end reactive power estimated value of each route.
The implementation of the embodiments of the present invention has the following beneficial effects:
The embodiment of the present invention is based on SCADA measured data and is modified to line impedance, binding member parameter (such as each node Voltage magnitude and phase value) and line parameter circuit value (such as route first and last end active power and reactive power) Lai Gaijin line estimation value, It is distinguished (such as 110kV, 220kV and 500kV) by different voltages grade, to reduce the redundancy of parameter, is overcome not With influencing each other between the parameter estimation result of route, estimated accuracy is improved, there is stronger theoretical basis and higher Engineering practical value.
It is worth noting that, in the above system embodiment, included each system unit only according to function logic into What row divided, but be not limited to the above division, as long as corresponding functions can be realized；In addition, each functional unit Specific name is also only for convenience of distinguishing each other, the protection scope being not intended to restrict the invention.
Those of ordinary skill in the art will appreciate that implement the method for the above embodiments be can be with Relevant hardware is instructed to complete by program, the program can be stored in a computer readable storage medium, The storage medium, such as ROM/RAM, disk, CD.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.

Claims (2)

1. one kind is for route estimated value improved method in SCADA system, which is characterized in that the described method includes:
A, SCADA measured data under current electric grid topological structure is obtained, and according to the SCADA measured data got, is obtained Each line impedance into the current electric grid topological structure, and be respectively further to estimate ginseng with obtained each line impedance It is several that each route is estimated, calculate each line estimation value；Wherein, the SCADA measured data is that institute is surveyed by SCADA It states each node voltage and phase and each line power in current electric grid topological structure and obtains；
B, each line voltage distribution grade in the current electric grid topological structure is determined, and according to each line voltage distribution etc. of the determination Grade, adjusts each route head terminal voltage per unit value, and according to calculated each line estimation value and described adjusted Each route head terminal voltage per unit value, corrects each line impedance, further distinguishes revised each line impedance again Each route is estimated again after being set as estimation parameter, obtains the estimated value after each route re-evaluates；
Wherein, the step a is specifically included:
It determines the node and route of current electric grid topological structure, and surveys to obtain each node voltage amplitude, each node by SCADA Voltage-phase value, each route first and last end active power and each route first and last end reactive power；
According to it is described survey obtain each node voltage amplitude, each node voltage phase place value, each route first and last end active power and Each route first and last end reactive power calculates each line impedance, and is respectively to estimate ginseng with calculated each line impedance Number, calculates each line Phases estimated value, each route first and last end active power estimated value and each route first and last end reactive power and estimates Evaluation；
Wherein, the step b is specifically included:
It is surveyed to obtain each node voltage amplitude according to the SCADA, determines each route head terminal voltage per unit value, and according to each line Road voltage class adjusts each route head terminal voltage per unit value；Wherein, the voltage class include 110kV, 220kV and 500kV；It is 110kV or 220kV pairs by determined voltage class when determining a certain line voltage distribution grade is 110kV or 220kV Route head terminal voltage per unit value is answered to remain unchanged；When determining a certain line voltage distribution grade is 500kV, by determined voltage etc. Grade is that 500kV corresponding line head terminal voltage per unit value is disposed as 1；
According to each route head terminal voltage per unit value adjusted and calculated each line Phases estimated value, each Route first and last end active power estimated value and each route first and last end reactive power estimated value, obtain each line reactance adjustment amount and its Corresponding susceptance adjustment amount；
According to obtained each line reactance adjustment amount and its corresponding susceptance adjustment amount and the calculated line impedance, Each line impedance is corrected, and revised each line impedance is obtained into each route amendment respectively again as estimation parameter The revised first and last end active power estimated value of phase estimation value afterwards, each route and the revised idle function in first and last end of each route Rate estimated value.
2. one kind improves system for route estimated value in SCADA system, which is characterized in that the system comprises:
Evaluation unit of route, gets for obtaining SCADA measured data under current electric grid topological structure, and according to described SCADA measured data, obtain each line impedance in the current electric grid topological structure, and further with obtained each line Anti- roadlock is respectively that estimation parameter estimates each route, calculates each line estimation value；Wherein, the SCADA surveys number According to being to survey each node voltage and phase and each line power in the current electric grid topological structure by SCADA to obtain 's；
Route re-evaluates unit, for determining each line voltage distribution grade in the current electric grid topological structure, and according to described Determining each line voltage distribution grade adjusts each route head terminal voltage per unit value, and according to calculated each line estimation Value and each route head terminal voltage per unit value adjusted, correct each line impedance, further will be described revised Each line impedance again estimates each route after being set to estimation parameter again, obtains estimating after each route re-evaluates Evaluation；
Wherein, evaluation unit of the route includes:
Data acquisition module for determining the node and route of current electric grid topological structure, and surveys to obtain each section by SCADA Point voltage magnitude, each node voltage phase place value, each route first and last end active power and each route first and last end reactive power；
Estimation block of route, for according to the obtained each node voltage amplitude, each node voltage phase place value, each of surveying Route first and last end active power and each route first and last end reactive power calculate each line impedance, and with described calculated each Line impedance is respectively to estimate parameter, calculates each line Phases estimated value, each route first and last end active power estimated value and each Route first and last end reactive power estimated value；
Wherein, the route re-evaluates unit and includes:
Voltage distinguishes adjustment module, obtains each node voltage amplitude for surveying according to the SCADA, determines each route first and last end Voltage per unit value, and according to each line voltage distribution grade, adjust each route head terminal voltage per unit value；Wherein, the voltage class Including 110kV, 220kV and 500kV；When determining a certain line voltage distribution grade is 110kV or 220kV, by determined voltage etc. Grade is that 110kV or 220kV corresponding line head terminal voltage per unit value remains unchanged；When determining that a certain line voltage distribution grade is It is that 500kV corresponding line head terminal voltage per unit value is disposed as 1 by determined voltage class when 500kV；
Adjustment amount obtains module, for according to each route head terminal voltage per unit value adjusted and described calculated Each line Phases estimated value, each route first and last end active power estimated value and each route first and last end reactive power estimated value, obtain Each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Route re-evaluates module, each line reactance adjustment amount and its corresponding susceptance adjustment amount for being obtained according to and The calculated line impedance corrects each line impedance, and revised each line impedance is used as again respectively and is estimated Parameter is calculated, the revised first and last end active power estimated value of the revised phase estimation value of each route, each route and each line are obtained The revised first and last end reactive power estimated value in road.
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