CN106845143A - One kind is for circuit estimate improved method and system in SCADA system - Google Patents
One kind is for circuit estimate improved method and system in SCADA system Download PDFInfo
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- CN106845143A CN106845143A CN201710145626.5A CN201710145626A CN106845143A CN 106845143 A CN106845143 A CN 106845143A CN 201710145626 A CN201710145626 A CN 201710145626A CN 106845143 A CN106845143 A CN 106845143A
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Abstract
The present invention provides a kind of for circuit estimate improved method in SCADA system, including SCADA measured datas under acquisition current electric grid topological structure, obtain each line impedance, and estimation parameter is respectively with each line impedance estimating each circuit, calculate each line estimation value；Wherein, SCADA measured datas are surveyed each node voltage and phase and each line power and are obtained by SCADA；Determine each line voltage distribution grade, adjust each circuit first and last terminal voltage perunit value, and according to each circuit first and last terminal voltage perunit value after each line estimation value and adjustment, correct each line impedance and again be set to estimation parameter after, again each circuit is estimated, obtains the estimate after each circuit is re-evaluated.Implement the present invention, corrective networks Topology Error the estimated value of SCADA system can be improved from parameter error and is distinguished by by different voltage class simultaneously, with stronger theoretical foundation and engineering practical value higher.
Description
Technical field
The present invention relates to electrical network parameter estimating techniques field, more particularly to one kind is for circuit estimate in SCADA system
Improved method and system.
Background technology
Modern energy management systems (Energy Management System, abbreviation EMS) are using electrical network parameter and institute
The real time information for collecting is analyzed, assesses and decision-making, and a critical function among it just includes state estimation.
Due to no measured data so that EMS is generally calculated using the theoretical value or empirical value of electrical network parameter, but is existed a variety of
Reason causes these parameters timely cannot usually to be safeguarded with correct, so as to cause parameter error to turn into long-standing problem EMS realities
With the problem changed, computational accuracy of the state estimation in regional area is seriously reduced, and cause the follow-up advanced analysis of EMS and determine
Plan result does not meet actual conditions, further the practical level of influence EMS.
In order to obtain satisfied and accurate quantity of state estimate, it is required to have two conditions：Firstth, measurement not only exists
The requirement of estimation is met in quantity and in accuracy；Secondth, estimate that object is that network model must be accurate.
But, due to the complexity of network model, i.e., not only include network topology structure, also including network paramter models,
And parameter model can be divided into angle of line admittance, shunt capacitance, transformer tap positions and phase shifter etc. again, therefore
In the state estimation procedure of EMS, there are two factors of aspect influences the accuracy of estimated result：On the one hand, network model
Although topological structure is that oneself knows, but more or less there is also some errors；On the other hand, there are different mistakes in network parameter
Difference (such as because lack actual measurement parameter amount and directly using design parameter or parameter measurement condition and actual motion condition difference compared with
Greatly, make given parameter value has difference with the component parameters in actual motion；And for example the component parameters in actual motion because relocating,
Reconstruction, or change is there occurs because of reasons such as environmental changes, but the parameter of element corresponding in database is not obtained in time
Renewal；What and for example control centre grasped to the tap joint position of operating automatic powerstat is imprecise etc.), these
To all cause the performance of state estimation to decline to a great extent, directly affect the analytic function of subsequent software, result even in EMS and sent
Harmful control action, influences the normal safe operation of power system.And different parameter errors is for the influence of state estimation
It is different.
In view of SCADA system is widely used in power system, the operational outfit at scene can be monitored and 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 " work(
Energy, RTU (remote-terminal unit), FTU (ca bin) etc., phase has been played in integrated automation of transformation stations construction now
When important effect, therefore state estimation is carried out in EMS based on SCADA system it is necessary.
However, the line parameter circuit value for being currently based on SCADA system estimates it is to carry out parameter Estimation by equation redundancy, deposit
In the interactional problem of parameter estimation result for being difficult to weigh estimated accuracy and different circuits.Meanwhile, the mistake of line parameter circuit value
Mainly caused by the change of the mistake and component parameters of network topology by mistake, 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 faded to zero) by nominal parameter corresponding to element admittances value.And, in the past
Correlative study in do not discussed and be distinguish between by different voltage class.Therefore, it is necessary to can be with using this feature
To be combined with parameter error by power system network Topology Error and be estimated, and be distinguish between by different voltage class.
The content of the invention
Embodiment of the present invention technical problem to be solved is, there is provided one kind is for circuit estimate in SCADA system
Improved method and system, can improve the estimated value of SCADA system and by not by corrective networks Topology Error with parameter error simultaneously
It is distinguished by with voltage class, with stronger theoretical foundation and engineering practical value higher.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of for circuit estimate in SCADA system
Improved method, methods described includes：
SCADA measured datas under a, acquisition current electric grid topological structure, and number is surveyed according to the SCADA for getting
According to obtaining each line impedance in the current electric grid topological structure, and be further respectively with each line impedance for obtaining
Estimate that parameter is estimated each circuit, calculate each line estimation value；Wherein, the SCADA measured datas are by SCADA
Survey in the current electric grid topological structure each node voltage and phase and each line power and obtain；
B, determine each line voltage distribution grade in the current electric grid topological structure, and according to each line voltage distribution of the determination
Grade, adjusts each circuit first and last terminal voltage perunit value, and according to each line estimation value for calculating and the adjustment after
Each circuit first and last terminal voltage perunit value, correct each line impedance, further revised each line impedance is divided again
Each circuit is estimated again after not being set to estimation parameter, the estimate after each circuit is re-evaluated is obtained.
Wherein, the step a is specifically included：
Determine the node and circuit of current electric grid topological structure, and surveyed by SCADA and obtain each node voltage amplitude, each
Node voltage phase place value, each circuit first and last end active power and each circuit first and last end reactive power；
According to each node voltage amplitude, each node voltage phase place value, each circuit first and last end wattful power surveyed and obtain
Rate and each circuit first and last end reactive power, calculate each line impedance, and are respectively with each line impedance for calculating and estimate
Parameter is calculated, each line Phases estimate, each circuit first and last end active power estimate and each idle work(in circuit first and last end is calculated
Rate estimate.
Wherein, the step b is specifically included：
Each node voltage amplitude is obtained according to SCADA actual measurements, each circuit first and last terminal voltage perunit value is determined, and according to
Each line voltage distribution grade, adjusts each circuit first and last terminal voltage perunit value；Wherein, the voltage class include 110kV, 220kV and
500kV；It is 110kV or 220kV pairs by determined voltage class when it is determined that a certain line voltage distribution grade is 110kV or 220kV
Circuit first and last terminal voltage perunit value is answered to keep constant；When it is determined that a certain line voltage distribution grade is 500kV, by determined voltage etc.
Level is disposed as 1 for 500kV corresponding line first and last terminal voltage perunit values；
Each circuit first and last terminal voltage perunit value and each line Phases for calculating after according to the adjustment are estimated
Value, each circuit first and last end active power estimate and each circuit first and last end reactive power estimate, obtain each line reactance adjustment
Amount and its corresponding susceptance adjustment amount；
According to each line reactance adjustment amount for obtaining and its corresponding susceptance adjustment amount and the circuit for calculating
Impedance, corrects each line impedance, and revised each line impedance is obtained into each circuit respectively again as estimation parameter
The revised first and last end active power estimate of revised phase estimation value, each circuit and the revised first and last end of each circuit without
Work(power estimation value.
The embodiment of the present invention additionally provides a kind of for circuit estimate improvement system, the system bag in SCADA system
Include：
Evaluation unit of circuit, for obtaining SCADA measured datas under current electric grid topological structure, and obtains according to described
The SCADA measured datas got, obtain each line impedance in the current electric grid topological structure, and is further obtained with described
Each line impedance is respectively estimation parameter and each circuit is estimated, calculates each line estimation value；Wherein, the SCADA realities
It is to survey in the current electric grid topological structure each node voltage and phase and each line power by SCADA and obtain to survey data
；
Circuit 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 circuit first and last terminal voltage perunit value, and according to each circuit for calculating
Each circuit first and last terminal voltage perunit value after estimate and the adjustment, corrects each line impedance, further by the amendment
Each line impedance afterwards estimated each circuit again after being set to estimation parameter again, is obtained after each circuit re-evaluates
Estimate.
Wherein, evaluation unit of the circuit includes：
Data acquisition module, node and circuit for determining current electric grid topological structure, and obtained by SCADA actual measurements
Each node voltage amplitude, each node voltage phase place value, each circuit first and last end active power and each circuit first and last end reactive power；
Estimation block of circuit, for surveying each node voltage amplitude, each node voltage phase place that obtain according to described
Value, each circuit first and last end active power and each circuit first and last end reactive power, calculate each line impedance, and calculate with described
Each line impedance be respectively estimation parameter, calculate each line Phases estimate, each circuit first and last end active power estimate
With each circuit first and last end reactive power estimate.
Wherein, the circuit re-evaluates unit and includes：
Voltage distinguishes adjusting module, for obtaining each node voltage amplitude according to SCADA actual measurements, determines that each circuit is first
Terminal voltage perunit value, and according to each line voltage distribution grade, adjust each circuit first and last terminal voltage perunit value；Wherein, the voltage
Grade includes 110kV, 220kV and 500kV；When it is determined that a certain line voltage distribution grade is 110kV or 220kV, electricity will be determined
Pressure grade is that 110kV or 220kV corresponding line first and last terminal voltages perunit value keeps constant；When it is determined that a certain line voltage distribution grade is
During 500kV, by determined voltage class for 500kV corresponding line first and last terminal voltage perunit values are disposed as 1；
Adjustment amount acquisition module, for each circuit first and last terminal voltage perunit value after according to the adjustment and the calculating
Each line Phases estimate, each circuit first and last end active power estimate and each circuit first and last end reactive power estimate for going out,
Obtain each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Circuit re-evaluates module, for each line reactance adjustment amount obtained according to and its adjustment of corresponding susceptance
Amount and the line impedance for calculating, correct each line impedance, and revised each line impedance is made again respectively
Be estimation parameter, obtain the revised first and last end active power estimate of the revised phase estimation value of each circuit, each circuit and
Each revised first and last end reactive power estimate of circuit.
Implement the embodiment of the present invention, have the advantages that：
The embodiment of the present invention is modified based on SCADA measured datas to line impedance, binding member parameter (such as each node
Voltage magnitude and phase value) and line parameter circuit value (such as circuit first and last end active power and reactive power) improve line estimation value,
(such as 110kV, 220kV and 500kV) is distinguished by by different voltage class, so as to reduce the redundancy of parameter, is overcome not
With influencing each other between the parameter estimation result of circuit, estimated accuracy is improve, with stronger theoretical foundation and higher
Engineering practical value.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These accompanying drawings obtain other accompanying drawings and still fall within scope of the invention.
Fig. 1 is a kind of flow chart for circuit estimate improved method in SCADA system provided in an embodiment of the present invention；
Fig. 2 is opened up for one kind provided in an embodiment of the present invention for power network in circuit estimate improved method in SCADA system
Flutter the application scenario diagram of structure；
Fig. 3 is that a kind of structure for improving system for circuit estimate in SCADA system provided in an embodiment of the present invention 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 accompanying drawing
Step ground is described in detail.
As shown in figure 1, in the embodiment of the present invention, there is provided one kind be used for circuit estimate improvement side in SCADA system
Method, methods described includes：
SCADA measured datas under step S1, acquisition current electric grid topological structure, and according to the SCADA realities for getting
Data are surveyed, each line impedance in the current electric grid topological structure is obtained, and further with each line impedance for obtaining point
Wei not estimate that parameter is estimated each circuit, calculates each line estimation value；Wherein, the SCADA measured datas are to pass through
SCADA surveys in the current electric grid topological structure each node voltage and phase and each line power and obtains；
Detailed process is the node and circuit for determining current electric grid topological structure, and obtains each node by SCADA actual measurements
Voltage magnitude, each node voltage phase place value, each circuit first and last end active power and each circuit first and last end reactive power；
According to actual measurement obtain each node voltage amplitude, each node voltage phase place value, each circuit first and last end active power and
Each circuit first and last end reactive power, calculates each line impedance, and is respectively estimation parameter with each line impedance for calculating, meter
Calculate each line Phases estimate, each circuit first and last end active power estimate and each circuit first and last end reactive power estimate.
Step S2, determine each line voltage distribution grade in the current electric grid topological structure, and according to each line of the determination
Road voltage class, adjusts each circuit first and last terminal voltage perunit value, and according to each line estimation value for calculating and described
Each circuit first and last terminal voltage perunit value after adjustment, corrects each line impedance, further by revised each line impedance
Each circuit is estimated again after being set to estimation parameter again, the estimate after each circuit is re-evaluated is obtained.
Detailed process is to obtain each node voltage amplitude according to SCADA actual measurements, determines each circuit first and last terminal voltage perunit
Value, and according to each line voltage distribution grade, adjust each circuit first and last terminal voltage perunit value；Wherein, voltage class include 110kV,
220kV and 500kV；When it is determined that a certain line voltage distribution grade is 110kV or 220kV, by determined voltage class for 110kV or
220kV corresponding line first and last terminal voltages perunit value keeps constant；When it is determined that a certain line voltage distribution grade be 500kV when, by really
Voltage class is determined for 500kV corresponding line first and last terminal voltage perunit values are disposed as 1；
Each circuit first and last terminal voltage perunit value after according to adjustment and each line Phases estimate, each circuit that calculate
First and last end active power estimate and each circuit first and last end reactive power estimate, obtain each line reactance adjustment amount and its correspondence
Susceptance adjustment amount；
According to each line reactance adjustment amount and its corresponding susceptance adjustment amount that obtain and the line impedance for calculating, amendment
Each line impedance, and revised each line impedance is obtained into the revised phase of each circuit respectively again as estimation parameter
The revised first and last end active power estimate of estimate, each circuit and the revised first and last end reactive power of each circuit are estimated
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 because line impedance parameter (reactance and susceptance) causes, in order to eliminate departure to state estimation
The influence of result is, it is necessary to the line impedance parameter to using is adjusted.
Firstly, for 220kV and 110kV circuits, 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 circuits ij, susceptance adjustment amount；With
The respectively conductance of 110kV circuits ij, susceptance adjustment amount；vi,vjIt is circuit ij first and last end node voltage perunit values；θijIt is circuit
Ij first and last end node voltage phase differences；ΔPij、ΔPji、ΔQij、ΔQjiExpression formula it is as follows：
In formula (3),WithRespectively circuit ij first and ends active power measuring value；WithRespectively circuit ij
First and end reactive power measuring value；WithRespectively circuit ij first and ends active power estimate；WithRespectively
Circuit ij first and end reactive power estimates.
Secondly, for 500kV circuits, because voltage class is high, each node voltage perunit value all close to 1 and difference not
Greatly, thus in formula (1) and (2) v is takeni=vj=1, adjustment amount is calculated using formula (4) and (5), it is specific as follows：
In formula (4) and (5),WithThe respectively conductance of 500kV circuits ij, susceptance adjustment amount；θijIt is circuit ij
Two ends node voltage phase place is poor；ΔPij、ΔPji、ΔQij、ΔQjiExpression formula it is identical with formula (3).
In embodiments of the present invention, calculating is modified to the original impedance of each circuit using formula (6), is calculated amendment
Each line impedance afterwards, it is specific as follows：
In formula (6),It is the revised impedances of circuit ij, ZijIt is the original impedances of circuit ij, Δ gijBe by formula (1) or
The circuit ij conductance adjustment amounts that formula (4) is calculated, Δ bijIt is the circuit ij susceptance adjustment amounts calculated by formula (2) or formula (5).
As shown in Fig. 2 being used for SCADA system to the one kind in the embodiment of the present invention using the node modular system of IEEE3 machines 9
The application scenarios of upper circuit estimate improved method are described further, and are specifically illustrated by taking circuit 4-5 as an example：
The first step, by RTU obtain related SCADA measured datas it is as shown in table 1 below：
Table 1：
| Measuring point | ||||||
| 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 perunit value after corresponding measured data conversion.
By the related data of table 1, the impedance in database that can calculate circuit 4-5 is Z45=(0.005+
J0.138) Ω, and the line of circuit 4-5 is obtained after state estimation for estimation parameter carries out state estimation using circuit 4-5 impedances
Road trend and phase angle, i.e. circuit 4-5 line Phases estimate, circuit 4-5 first and last end active power estimate and circuit 4-5 first and last
End reactive power estimate, shown in table specific as follows 2：
Table 2
| Measuring point | |||||
| Estimate (p.u.) | 0.286608 | 0.002389 | 0.286154 | 0.141899 | 2.3322 |
| Deviation ratio (%) | 6.74 | 139.96 | 6.35 | 3.65 | —— |
Now, deviation ratio is calculated by the estimate of table 2 and the measuring value of table 1.
Second step, calculating circuit 4-5 impedance parameter (reactance and susceptance) adjustment amount, step are as follows：
The voltage class of circuit 4-5 is determined for 110kV, seeks Line Flow departure, Δ P before and after estimation45=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 in formula (1) and (2) Line Flow departure into, try to achieve Δ g45=1.5995, Δ b45=-3.1508；
3rd step, according to formula (6), correct circuit 4-5 impedances, i.e.,
Z/ 45=1/ (1/Z45+Δg45+Δb45)=(0.0167+j0.0933) Ω；
Now using the parameter Z after estimating/ 45Carry out estimating to obtain, shown in table specific as follows 3：
Table 3
| Measuring point | |||||
| Estimate (p.u.) | 0.306670 | -0.005601 | 0.304971 | 0.137034 | 1.6321 |
| Deviation ratio (%) | 0.2 | 4.4 | 0.19 | 0.11 | —— |
As can be seen here, after amendment impedance parameter, state estimation accuracy is remarkably improved.
As shown in figure 3, in the embodiment of the present invention, there is provided one kind be used for circuit estimate in SCADA system and improve system
System, the system includes：
Evaluation unit 110 of circuit, for obtaining SCADA measured datas under current electric grid topological structure, and according to institute
The SCADA measured datas for getting are stated, each line impedance in the current electric grid topological structure is obtained, and further with described
To each line impedance be respectively estimation parameter each circuit is estimated, calculate each line estimation value；Wherein, it is described
SCADA measured datas are to survey each node voltage and phase and each circuit in the current electric grid topological structure by SCADA
Power and obtain；
Circuit 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 circuit first and last terminal voltage perunit value is adjusted, and according to each line for calculating
Each circuit first and last terminal voltage perunit value after road estimate and the adjustment, corrects each line impedance, is further repaiied described
Each line impedance after just is estimated each circuit, obtains each circuit and re-evaluate again after being set to estimation parameter again
Estimate afterwards.
Wherein, evaluation unit 110 of the circuit includes：
Data acquisition module 1101, node and circuit for determining current electric grid topological structure, and surveyed by SCADA
Obtain each node voltage amplitude, each node voltage phase place value, each circuit first and last end active power and each idle work(in circuit first and last end
Rate；
Estimation block 1102 of circuit, for surveying each node voltage amplitude, each node voltage that obtain according to described
Phase value, each circuit first and last end active power and each circuit first and last end reactive power, calculate each line impedance, and in terms of described
Each line impedance for calculating is respectively estimation parameter, calculates each line Phases estimate, each circuit first and last end active power and estimates
Evaluation and each circuit first and last end reactive power estimate.
Wherein, the circuit re-evaluates unit 120 and includes：
Voltage distinguishes adjusting module 1201, for obtaining each node voltage amplitude according to SCADA actual measurements, determines each line
Road first and last terminal voltage perunit value, and according to each line voltage distribution grade, adjust each circuit first and last terminal voltage perunit value；Wherein, it is described
Voltage class includes 110kV, 220kV and 500kV；When it is determined that a certain line voltage distribution grade be 110kV or 220kV when, by really
Voltage class is determined for 110kV or 220kV corresponding line first and last terminal voltages perunit value keeps constant；When it is determined that a certain line voltage distribution etc.
When level is for 500kV, by determined voltage class for 500kV corresponding line first and last terminal voltage perunit values are disposed as 1；
Adjustment amount acquisition module 1202, for each circuit first and last terminal voltage perunit value after according to the adjustment and described
Each line Phases estimate, each circuit first and last end active power estimate and each circuit first and last end reactive power for calculating are estimated
Value, obtains each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Circuit re-evaluates module 1203, for each line reactance adjustment amount and its corresponding susceptance that are obtained according to
Adjustment amount and the line impedance for calculating, correct each line impedance, and by revised each line impedance difference again
Secondary conduct estimation parameter, obtains the revised first and last end active power of the revised phase estimation value of each circuit, each circuit and estimates
Value and the revised first and last end reactive power estimate of each circuit.
Implement the embodiment of the present invention, have the advantages that：
The embodiment of the present invention is modified based on SCADA measured datas to line impedance, binding member parameter (such as each node
Voltage magnitude and phase value) and line parameter circuit value (such as circuit first and last end active power and reactive power) improve line estimation value,
(such as 110kV, 220kV and 500kV) is distinguished by by different voltage class, so as to reduce the redundancy of parameter, is overcome not
With influencing each other between the parameter estimation result of circuit, estimated accuracy is improve, with stronger theoretical foundation and higher
Engineering practical value.
It is worth noting that, in said system embodiment, each included system unit is to enter according to function logic
What row was divided, but above-mentioned division is not limited to, as long as corresponding function can be realized；In addition, each functional unit
Specific name is also only to facilitate mutually distinguish, the protection domain being not intended to limit the invention.
One of ordinary skill in the art will appreciate that all or part of step in realizing above-described embodiment method can be
The hardware of correlation is instructed to complete by program, described program can be stored in a computer read/write memory medium,
Described storage medium, such as ROM/RAM, disk, CD.
Above disclosed is only present pre-ferred embodiments, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (6)
1. it is a kind of for circuit estimate improved method in SCADA system, it is characterised in that methods described includes：
SCADA measured datas under a, acquisition current electric grid topological structure, and according to the SCADA measured datas for getting, obtain
Each line impedance in the current electric grid topological structure, and further with each line impedance for obtaining be respectively estimation ginseng
It is several that each circuit is estimated, calculate each line estimation value；Wherein, the SCADA measured datas are to survey institute by SCADA
State in current electric grid topological structure each node voltage and phase and each line power and obtain；
B, determine each line voltage distribution grade in the current electric grid topological structure, and each line voltage distribution according to the determination etc.
Level, adjusts each circuit first and last terminal voltage perunit value, and according to each line estimation value for calculating and the adjustment after
Each circuit first and last terminal voltage perunit value, corrects each line impedance, further distinguishes revised each line impedance again
Each circuit is estimated again after being set to estimation parameter, the estimate after each circuit is re-evaluated is obtained.
2. the method for claim 1, it is characterised in that the step a is specifically included：
Determine the node and circuit of current electric grid topological structure, and each node voltage amplitude, each node are obtained by SCADA actual measurements
Voltage-phase value, each circuit first and last end active power and each circuit first and last end reactive power；
According to it is described survey obtain each node voltage amplitude, each node voltage phase place value, each circuit first and last end active power and
Each circuit first and last end reactive power, calculates each line impedance, and be respectively estimation ginseng with each line impedance for calculating
Number, calculates each line Phases estimate, each circuit first and last end active power estimate and each circuit first and last end reactive power and estimates
Evaluation.
3. method as claimed in claim 2, it is characterised in that the step b is specifically included：
Each node voltage amplitude is obtained according to SCADA actual measurements, each circuit first and last terminal voltage perunit value is determined, and according to each line
Road voltage class, adjusts each circuit first and last terminal voltage perunit value；Wherein, the voltage class include 110kV, 220kV and
500kV；It is 110kV or 220kV pairs by determined voltage class when it is determined that a certain line voltage distribution grade is 110kV or 220kV
Circuit first and last terminal voltage perunit value is answered to keep constant；When it is determined that a certain line voltage distribution grade is 500kV, by determined voltage etc.
Level is disposed as 1 for 500kV corresponding line first and last terminal voltage perunit values；
It is each circuit first and last terminal voltage perunit value and each line Phases estimate for calculating after according to the adjustment, each
Circuit first and last end active power estimate and each circuit first and last end reactive power estimate, obtain each line reactance adjustment amount and its
Corresponding susceptance adjustment amount；
According to each line reactance adjustment amount for obtaining and its corresponding susceptance adjustment amount and the line impedance for calculating,
Each line impedance is corrected, and revised each line impedance is obtained into each circuit amendment respectively again as estimation parameter
The revised first and last end active power estimate of phase estimation value afterwards, each circuit and the revised idle work(in first and last end of each circuit
Rate estimate.
4. it is a kind of to improve system for circuit estimate in SCADA system, it is characterised in that the system includes：
Evaluation unit of circuit, for obtaining SCADA measured datas under current electric grid topological structure, and gets according to described
SCADA measured datas, obtain each line impedance in the current electric grid topological structure, and further with each line for obtaining
Anti- being respectively of roadlock estimates that parameter is estimated each circuit, calculates each line estimation value；Wherein, the SCADA actual measurements number
Obtain according to being by SCADA to survey in the current electric grid topological structure each node voltage and phase and each line power
's；
Circuit re-evaluates unit, for determining each line voltage distribution grade in the current electric grid topological structure, and according to described
Each line voltage distribution grade for determining, adjusts each circuit first and last terminal voltage perunit value, and according to each line estimation for calculating
Each circuit first and last terminal voltage perunit value after value and the adjustment, corrects each line impedance, further will be described revised
Each line impedance be set to again estimation parameter after each circuit is estimated again, obtain estimating after each circuit is re-evaluated
Evaluation.
5. system as claimed in claim 4, it is characterised in that evaluation unit of the circuit includes：
Data acquisition module, node and circuit for determining current electric grid topological structure, and each section is obtained by SCADA actual measurements
Point voltage magnitude, each node voltage phase place value, each circuit first and last end active power and each circuit first and last end reactive power；
Estimation block of circuit, for according to each node voltage amplitude for obtaining, each node voltage phase place value, each of surveying
Circuit first and last end active power and each circuit first and last end reactive power, calculate each line impedance, and with it is described calculate it is each
Line impedance is respectively estimation parameter, calculates each line Phases estimate, each circuit first and last end active power estimate and each
Circuit first and last end reactive power estimate.
6. system as claimed in claim 5, it is characterised in that the circuit re-evaluates unit to be included：
Voltage distinguishes adjusting module, for obtaining each node voltage amplitude according to SCADA actual measurements, determines each circuit first and last end
Voltage perunit value, and according to each line voltage distribution grade, adjust each circuit first and last terminal voltage perunit value；Wherein, the voltage class
Including 110kV, 220kV and 500kV；When it is determined that a certain line voltage distribution grade is 110kV or 220kV, by determined voltage etc.
Level keeps constant for 110kV or 220kV corresponding line first and last terminal voltages perunit value；When it is determined that a certain line voltage distribution grade is
During 500kV, by determined voltage class for 500kV corresponding line first and last terminal voltage perunit values are disposed as 1；
Adjustment amount acquisition module, for each circuit first and last terminal voltage perunit value after according to the adjustment and described calculates
Each line Phases estimate, each circuit first and last end active power estimate and each circuit first and last end reactive power estimate, obtain
Each line reactance adjustment amount and its corresponding susceptance adjustment amount；
Circuit re-evaluates module, for according to each line reactance adjustment amount for obtaining and its corresponding susceptance adjustment amount with
The line impedance for calculating, corrects each line impedance, and using revised each line impedance respectively again as estimating
Parameter is calculated, the revised first and last end active power estimate of the revised phase estimation value of each circuit, each circuit and each line is obtained
The revised first and last end reactive power estimate in road.
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