CN104376174A - Alternating current line parameter identification and correction method based on line impedance ratio - Google Patents
Alternating current line parameter identification and correction method based on line impedance ratio Download PDFInfo
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Abstract
The invention relates to an alternating current line parameter identification and correction method based on a line impedance ratio. The method includes the following steps that (1) the alternating line information is extracted; (2) the specific value between the actual resistance and reactance of an alternating line is calculated; (3) the standard resistance, reactance, conductance and susceptance value of the line of the model in unit length are searched for in a line standard parameter database; (4) whether the alternating current line length information is contained in an input file or not is judged; (5) the standard value of an alternating line parameter is compared with the actual value, if the compared value does not exceed the warning threshold value, the parameter is reasonable, and identification is ended; (6) the estimated standard value of the alternating line parameter and the standard value changing range are checked, if the estimated standard value is within the maximum value and the minimum value of the standard value changing range, the parameter is reasonable, and identification is ended; (7) the information related to the data identified to be false or unreasonable is output. The alternating current line parameter identification and correction method based on the line impedance ratio can be widely applied to alternating line parameter identification and correction in large-scale power grid planning.
Description
Technical field
The present invention relates to a kind of alternating current circuit parameter identification and modification method, particularly about a kind of alternating current circuit parameter identification and modification method based on line impedance ratio.
Background technology
Along with the fast development of China's economy, electrical network scale is also in rapid expansion, due to the restriction of information tool, large-scale electrical network increases the possibility that planning personnel fills out wrong data on the one hand, discharge is looked into misdata and is brought great inconvenience on the other hand, this also result in actual mechanical process, and planning personnel obviously knows that may there are data fills in mistake, but suffers from and do not have identification large-scale data method like this and feel simply helpless.
In China, BPA power system computation analysis software is widely used a software in Power System Planning process, has the plurality of advantages such as convergence is good, computing velocity is fast.But, present stage planning personnel uses in the process of BPA in practical operation, because BPA lacks man-machine interaction instrument practical flexibly, its Load flow calculation data have been filled in primarily of manual entry, and the BPA data of same planning electrical network need different people to fill in respectively just can be completed, this wherein may have the Electric Power Network Planning personnel such as prefecture-level, provincial, region class, because the consummate degree such as technology, business exists larger difference, often cause BPA data to obtain in collection, fill in inevitably generation mistake or irrational data in the process such as typing, edit-modify.In addition, because BPA software itself exists many special data form restrictions, such as, in BPA, each of each data card has special data length and data precision specification, but being familiar with and the degree of understanding, filling in the aspects such as customary way and there is larger difference due to different user of service, often cause different personnel can produce the different phenomenon of computational accuracy when filling in identical data.
The mistake that the problems referred to above cause or unreasonable data can produce considerable influence to the Load flow calculation convergence of BPA and result.First, mistake and unreasonable data can affect the convergence of Load flow calculation, increase the work load that planning personnel adjusts trend; Secondly, mistake and unreasonable data can affect the accuracy of calculation of tidal current, Electric Power Network Planning result and actual result deviation may be caused comparatively far away, cause larger economic waste, may hide some dangers for what is more to power grid security.Therefore, identification and correction method that is practical, that realize mistake and unreasonable data in large scale electric network planning flexibly, efficiently has important effect and more practical value.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of alternating current circuit parameter identification and modification method based on line impedance ratio that comprehensively can realize the identification and correction of mistake and unreasonable data in large scale electric network planning efficiently.
For achieving the above object, the present invention takes following technical scheme: a kind of alternating current circuit parameter identification and modification method based on line impedance ratio, comprises the following steps: the information 1) extracting the alternating current circuit being used for Load flow calculation in existing BPA dat file; 2) calculation procedure 1) in the actual resistance of all alternating current circuits that extracts and reactance ratio; 3) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit type information, if had, then directly utilize the alternating current circuit type information contained in line standard parameter library, search the measuring resistance of this model circuit unit length, reactance, conductance and susceptance value; Otherwise, then according to step 2) in measuring resistance in the actual resistance of alternating current circuit that calculates and reactance ratio and line standard parameter library and reactance ratio compare, determine circuit model, and according to searching the measuring resistance of this model circuit unit length, reactance, conductance and susceptance value in the accurate parameter library of the online road sign of circuit model determined; 4) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit length information, if had, then according to alternating current circuit length information and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard value of this alternating current circuit parameter, enter step 5); Otherwise, the incidence relation between different line parameter circuit value is utilized to set up regression model, estimate according to the length of set up regression model to alternating current circuit, and then according to the alternating current circuit length of estimation and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard of appraisal value of this alternating current circuit parameter, enter step 6); 5) by step 4) in the standard value of alternating current circuit parameter that obtains and the actual value of this alternating current circuit parameter contrast, judge whether the standard value of this alternating current circuit parameter and the deviation of actual value exceed the early warning threshold angle value preset, if do not exceed early warning threshold angle value, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; Otherwise, then the actual value of this alternating current circuit parameter is labeled as mistake or unreasonable data, and using step 4) in the standard value of this alternating current circuit parameter that obtains as the modified values of recommending, the standard value variation range simultaneously providing such parameters all of this model alternating current circuit, as the term of reference manually revising adjustment again, enters step 7); 6) by step 4) in the standard value variation range of the standard of appraisal value of alternating current circuit parameter that obtains and such parameters all of this model alternating current circuit test, if the standard of appraisal value of this alternating current circuit parameter is between the maximal value and minimum value of the standard value variation range of such parameters all of this model alternating current circuit, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; Otherwise, be considered as unreasonable, and substitute by corresponding maximal value or minimum value, and mark instead identification, confirm for during the artificial adjustment of amendment again, enter step 7); 7) output identification is the relevant information of mistake or unreasonable data.
Described step 4) in, the incidence relation between different line parameter circuit value is utilized to set up regression model, estimate according to the length of regression model to alternating current circuit, it comprises the following steps: 1. create historical data base: what historical data was extracted in BPA dat file fill in complete and reasonably alternating current circuit parameter, line length and circuit types; 2. regression equation is set up as follows:
L
a＝AL
r+BL
x+CL
b+D (1)
In formula, L
afor the estimated value of alternating current circuit length; L
rfor the line length that the resistance value of filling in historical data calculates divided by unit length standard electric resistance; L
xfor the line length that the reactance value filled in historical data calculates divided by unit length standard inductance value; L
bfor the line length that the susceptance value of filling in historical data calculates divided by unit length normalized susceptance value; L
wfor the alternating current circuit length value filled in historical data; A, B, C, D are respectively coefficient value to be tried to achieve;
for residual sum of squares (RSS); N is the number of sample data in historical data; 3. solve regression equation: from historical data base, read historical data, according to the set of coefficient value A, B, C, the D to be tried to achieve in historical data solution formula (1), utilize least square method according to formula (2), find and make residual sum of squares (RSS)
for the value of A, B, C, D of minimum value, determine formula (1); 4. estimate alternating current circuit length: first according to step 1) in alternating current circuit information and step 3) in the measuring resistance of unit length, reactance and the susceptance value that find calculate L
r, L
xand L
bvalue, the value calculated is substituted into the formula (1) 3. determined by step, calculates the estimated value L of line length
a.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention realizes owing to adopting computer software the identification having inerrancy or unreasonable supplemental characteristic in the Load flow calculation data of BPA automatically, drastically increase the work efficiency of planning personnel, ensure the accuracy of Electric Power Network Planning data and the reliability of result of calculation.2, the present invention contrasts due to the standard value and actual value adopting alternating current circuit parameter, therefore not only can judge whether correct this alternating current circuit parameter fills in exactly, the information such as proposed amendments value and canonical parameter variation range can also be provided, automatic Identification and the correction of mistake and unreasonable parameter in alternating current circuit can be realized.In sum, the present invention can be widely used in the alternating current circuit parameter identification and modification in large scale electric network planning.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the alternating current circuit parameter identification and modification method based on line impedance ratio of the present invention
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the invention provides a kind of alternating current circuit parameter identification and modification method based on line impedance ratio, comprise the following steps:
1) in existing BPA dat file, extract the information of the alternating current circuit being used for Load flow calculation.
2) calculation procedure 1) in the practical impedance ratio (resistance and reactance ratio) of all alternating current circuits that extracts.
3) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit type information, if had, then directly utilize the alternating current circuit type information contained in line standard parameter library, search the measuring resistance of this model circuit unit length, reactance, the parameter information such as conductance and susceptance value; If do not had, then according to step 2) in the practical impedance of alternating current circuit that calculates compare than with the normal impedance ratio in line standard parameter library, thus determine circuit model, and according to searching the measuring resistance of this model circuit unit length, reactance, the parameter information such as conductance and susceptance value in the accurate parameter library of the online road sign of circuit model determined.
4) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit length information, if had, then according to alternating current circuit length information and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard value of this alternating current circuit parameter, enter step 5); If do not had, then need to utilize the incidence relation between different line parameter circuit value to set up regression model, estimate according to the length of set up regression model to alternating current circuit, and then according to the alternating current circuit length of estimation and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard of appraisal value of this alternating current circuit parameter, enter step 6);
The incidence relation between different line parameter circuit value is utilized to set up regression model (as regression analysis model, neural network model, supporting vector machine model etc.), estimate according to the length of regression model to alternating current circuit, only carry out computational analysis for multiple regression analysis method at this, it comprises the following steps:
1. historical data base is created: historical data is the complete and reasonably data such as alternating current circuit parameter, line length and circuit types of filling in of extracting in BPA dat file.
2. regression equation is set up as follows:
L
a＝AL
r+BL
x+CL
b+D (1)
In formula, L
afor the estimated value of alternating current circuit length; L
rfor the line length that the resistance value of filling in historical data calculates divided by unit length standard electric resistance; L
xfor the line length that the reactance value filled in historical data calculates divided by unit length standard inductance value; L
bfor the line length that the susceptance value of filling in historical data calculates divided by unit length normalized susceptance value; L
wfor the alternating current circuit length value filled in historical data; A, B, C, D are respectively coefficient value to be tried to achieve;
for residual sum of squares (RSS); N is the number of sample data in historical data.
3. solve regression equation: from historical data base, read historical data, according to the set of coefficient value A, B, C, the D to be tried to achieve in historical data solution formula (1), utilize least square method to find according to formula (2) and make residual sum of squares (RSS)
for the value of A, B, C, D of minimum value, determine formula (1);
4. estimate alternating current circuit length: first according to step 1) in alternating current circuit information and step 3) in the measuring resistance of unit length, reactance and the susceptance value that find calculate L
r, L
xand L
bvalue, the value calculated is substituted into the formula (1) 3. determined by step, calculates the estimated value L of line length
a;
5) by step 4) in the standard value of alternating current circuit parameter that obtains and the actual value of this alternating current circuit parameter contrast, judge whether the standard value of this alternating current circuit parameter and the deviation of actual value exceed the early warning threshold angle value preset, if do not exceed early warning threshold angle value, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; If exceed early warning threshold angle value, then the actual value of this alternating current circuit parameter is labeled as mistake or unreasonable data, and using step 4) in the standard value of this alternating current circuit parameter that obtains as the modified values of recommending, the standard value variation range simultaneously providing such parameters all of this model alternating current circuit, as the term of reference manually revising adjustment again, enters step 7).
6) by step 4) in the standard value variation range of the standard of appraisal value of alternating current circuit parameter that obtains and such parameters all of this model alternating current circuit test, if the standard of appraisal value of this alternating current circuit parameter is between the maximal value and minimum value of the standard value variation range of such parameters all of this model alternating current circuit, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; Otherwise, be considered as unreasonable, and substitute by corresponding maximal value or minimum value, and mark instead identification, confirm for during the artificial adjustment of amendment again, enter step 7).
7) output identification is the relevant information of mistake or unreasonable data, as line name, numbering, parameter name, clock rate, actual value, proposed amendments value, mistake or unreasonable reason, length estimated value, standard parameter value etc.
The various embodiments described above are only for illustration of the present invention; wherein the structure of each parts, connected mode and manufacture craft etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (2)
1., based on an alternating current circuit parameter identification and modification method for line impedance ratio, comprise the following steps:
1) in existing BPA dat file, extract the information of the alternating current circuit being used for Load flow calculation;
2) calculation procedure 1) in the actual resistance of all alternating current circuits that extracts and reactance ratio;
3) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit type information, if had, then directly utilize the alternating current circuit type information contained in line standard parameter library, search the measuring resistance of this model circuit unit length, reactance, conductance and susceptance value; Otherwise, then according to step 2) in measuring resistance in the actual resistance of alternating current circuit that calculates and reactance ratio and line standard parameter library and reactance ratio compare, determine circuit model, and according to searching the measuring resistance of this model circuit unit length, reactance, conductance and susceptance value in the accurate parameter library of the online road sign of circuit model determined;
4) determining step 1) in the alternating current circuit information extracted whether containing alternating current circuit length information, if had, then according to alternating current circuit length information and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard value of this alternating current circuit parameter, enter step 5); Otherwise, the incidence relation between different line parameter circuit value is utilized to set up regression model, estimate according to the length of set up regression model to alternating current circuit, and then according to the alternating current circuit length of estimation and step 3) in the standard parameter value of this model circuit unit length that finds in line standard parameter library calculate the standard of appraisal value of this alternating current circuit parameter, enter step 6);
5) by step 4) in the standard value of alternating current circuit parameter that obtains and the actual value of this alternating current circuit parameter contrast, judge whether the standard value of this alternating current circuit parameter and the deviation of actual value exceed the early warning threshold angle value preset, if do not exceed early warning threshold angle value, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; Otherwise, then the actual value of this alternating current circuit parameter is labeled as mistake or unreasonable data, and using step 4) in the standard value of this alternating current circuit parameter that obtains as the modified values of recommending, the standard value variation range simultaneously providing such parameters all of this model alternating current circuit, as the term of reference manually revising adjustment again, enters step 7);
6) by step 4) in the standard value variation range of the standard of appraisal value of alternating current circuit parameter that obtains and such parameters all of this model alternating current circuit test, if the standard of appraisal value of this alternating current circuit parameter is between the maximal value and minimum value of the standard value variation range of such parameters all of this model alternating current circuit, then this alternating current circuit parameter is filled in rationally, terminates parameter identification; Otherwise, be considered as unreasonable, and substitute by corresponding maximal value or minimum value, and mark instead identification, confirm for during the artificial adjustment of amendment again, enter step 7);
7) output identification is the relevant information of mistake or unreasonable data.
2. a kind of alternating current circuit parameter identification and modification method based on line impedance ratio as claimed in claim 1, it is characterized in that: described step 4) in, the incidence relation between different line parameter circuit value is utilized to set up regression model, estimate according to the length of regression model to alternating current circuit, it comprises the following steps:
1. historical data base is created: what historical data was extracted in BPA dat file fill in complete and reasonably alternating current circuit parameter, line length and circuit types;
2. regression equation is set up as follows:
L
a＝AL
r+BL
x+CL
b+D (1)
In formula, L
afor the estimated value of alternating current circuit length; L
rfor the line length that the resistance value of filling in historical data calculates divided by unit length standard electric resistance; L
xfor the line length that the reactance value filled in historical data calculates divided by unit length standard inductance value; L
bfor the line length that the susceptance value of filling in historical data calculates divided by unit length normalized susceptance value; L
wfor the alternating current circuit length value filled in historical data; A, B, C, D are respectively coefficient value to be tried to achieve;
for residual sum of squares (RSS); N is the number of sample data in historical data;
3. solve regression equation: from historical data base, read historical data, according to the set of coefficient value A, B, C, the D to be tried to achieve in historical data solution formula (1), utilize least square method according to formula (2), find and make residual sum of squares (RSS)
for the value of A, B, C, D of minimum value, determine formula (1);
4. estimate alternating current circuit length: first according to step 1) in alternating current circuit information and step 3) in the measuring resistance of unit length, reactance and the susceptance value that find calculate L
r, L
xand L
bvalue, the value calculated is substituted into the formula (1) 3. determined by step, calculates the estimated value L of line length
a.
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| CN106501673A (en) * | 2016-10-21 | 2017-03-15 | 国网江苏省电力公司检修分公司 | A kind of clutter method of discrimination of measured current traveling wave of being discharged based on transmission line of electricity hidden danger |
| CN107276092A (en) * | 2017-06-20 | 2017-10-20 | 国网北京经济技术研究院 | A kind of alternating current circuit length discrimination method based on parameters relationship |
| CN107749622A (en) * | 2017-10-26 | 2018-03-02 | 华北电力大学 | A kind of alternating current circuit type and parameter identification method based on identified parameters projection |
| CN110034532A (en) * | 2019-02-26 | 2019-07-19 | 国家电网公司华东分部 | The discrimination method and device of the actual measurement parameter of line impedance |
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| CN105305432A (en) * | 2015-11-10 | 2016-02-03 | 国家电网公司 | Multivariate regression analysis based alternating current circuit length estimation and identification method |
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| CN107749622A (en) * | 2017-10-26 | 2018-03-02 | 华北电力大学 | A kind of alternating current circuit type and parameter identification method based on identified parameters projection |
| CN110034532A (en) * | 2019-02-26 | 2019-07-19 | 国家电网公司华东分部 | The discrimination method and device of the actual measurement parameter of line impedance |
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