CN105403800A - Electric power system parameter determination method and device - Google Patents
Electric power system parameter determination method and device Download PDFInfo
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- CN105403800A CN105403800A CN201511021104.1A CN201511021104A CN105403800A CN 105403800 A CN105403800 A CN 105403800A CN 201511021104 A CN201511021104 A CN 201511021104A CN 105403800 A CN105403800 A CN 105403800A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention provides an electric power system parameter determination method and device, belonging to the technical field of power grid excitation. The method comprises the following steps: obtaining the no-load characteristic curve data of the measured generator or exciter, and establishing a no-load characteristic curve; establishing an air gap line based on the no-load characteristic curve; obtaining a saturation coefficient based on the data of the 1.0 times of rating point and 1.2 times of rating point on the air gap line and the no-load characteristic curve; and obtaining the rated excitation voltage standard value based on the rated excitation current and rotor resistance of the air gap line. Through the establishment of the no-load characteristic curve based on the obtained no-load characteristic curve data and the establishment of the air gap line having unified gradient, the electric power system parameters including the saturation coefficient and the rated excitation voltage standard value in the range of 1.05 times of rating value to 1.2 times of rating value can be accurately obtained.
Description
Technical field
The present invention relates to a kind of defining method and device of parameters of electric power system, belong to electrical network excitation technology field.
Background technology
At present, the Data Source of Power System Stability Analysis and simulated program institute foundation mainly comprises: utilize Execl office software to draw the figure of field measurement data, and utilizes fault oscillograph record field measurement data and the curve map etc. drawn.
When utilizing Excel office software graphing, because field measurement data have error, therefore cannot draw level and smooth family curve, making air gap line be drawn into broken line instead of straight line, causing slope inconsistent.And when utilizing fault oscillograph record Plotting data curve, owing to lacking necessary measuring point, causing recording the ratings data being greater than 1.05 times, therefore also just cannot calculate characterisitic parameter during 1.2 times of ratings.
Summary of the invention
The present invention be solve that existing parameters of electric power system determination technology exists cannot draw level and smooth special efficacy curve and 1.05 times of ratings cannot be determined until the problem of special effect parameters of 1.2 times of ratings, and then propose a kind of defining method and device of parameters of electric power system, specifically comprise following technical scheme:
A defining method for parameters of electric power system, comprising:
Obtain the generator of actual measurement or the no-load characteristic data of exciter, and set up no-load characteristic;
Air gap line is set up according to described no-load characteristic;
According to the data acquisition saturation coefficient of 1.0 times of ratings points on described air gap line and no-load characteristic and 1.2 times of ratings points;
Rated excitation standard voltage value is obtained according to the rated exciting current on described air gap line and rotor resistance.
A determining device for parameters of electric power system, comprising:
Unloaded special efficacy curve sets up unit, for the no-load characteristic data of the generator or exciter that obtain actual measurement, and sets up no-load characteristic;
Unit set up by air gap line, for setting up air gap line according to described no-load characteristic;
Saturation coefficient acquiring unit, for the data acquisition saturation coefficient according to 1.0 times of ratings points on described air gap line and no-load characteristic and 1.2 times of ratings points;
Normal voltage acquiring unit, for obtaining rated excitation standard voltage value according to the rated exciting current on described air gap line and rotor resistance.
The invention has the beneficial effects as follows: by the no-load characteristic data of acquisition are set up no-load characteristic, and set up there is the air gap line of unified slope, thus can accurately obtain comprise saturation coefficient, rated excitation standard voltage value 1.05 times of ratings until parameters of electric power system in 1.2 times of nominal value range.
Accompanying drawing explanation
Fig. 1 shows the process flow diagram of the defining method of parameters of electric power system in an illustrative manner.
Fig. 2 is the process flow diagram of the defining method of the parameters of electric power system that embodiment one provides.
Fig. 3 is process flow diagram no-load characteristic data being carried out to data detection that embodiment one provides.
Fig. 4 is the no-load characteristic figure of 1.05 times of ratings that embodiment one provides.
Fig. 5 is the no-load characteristic figure of 1.2 times of ratings that embodiment one provides.
Fig. 6 be embodiment one provide according to no-load characteristic in the coordinate system relevant position set up air gap line schematic diagram.
Fig. 7 is that embodiment one provides quota really to determine the process flow diagram of field voltage standard value.
Fig. 8 is the structural drawing of the determining device of the parameters of electric power system that embodiment two provides.
Embodiment
Embodiments of the invention propose a kind of defining method of parameters of electric power system, and shown in composition graphs 1, the method comprises:
Step 11, obtains the generator of actual measurement or the no-load characteristic data of exciter, and sets up no-load characteristic.
For by the no-load characteristic data from the generator that on-the-spot oscillograph imports or manual typing is surveyed or exciter, the CHART ActiveX drafting in DELPHI program language can be utilized to go out no-load characteristic.
Wherein, data detection is carried out to these no-load characteristic data and the process that noise is eliminated can be comprised: the slope value first determining at least two points according to these no-load characteristic data, then noise is determined whether there is according to the slope value of these at least two points, if determine at least one noise, then obtain fitting data point by this no-load characteristic data fitting, and the noise in these no-load characteristic data is replaced with this fitting data point.
In addition, the maximal value of a rated excitation voltage and the maximal value of a rated exciting current can also be preset, when the parameter determined reaches this maximal value, then stop this subparameter determination flow process.
Step 12, sets up air gap line according to no-load characteristic.
Wherein, the process setting up air gap line can comprise: according to the data obtained during field measurement no-load characteristic, when to rise to certain section of curve before 0.3 perunit value be straight line to set end voltage, then obtain load voltage value and the load current value at set end voltage 0.3 perunit value place, the slope of this straight line can be calculated, be air gap line according to the straight line that this slope obtains.
Step 13, according to the data acquisition saturation coefficient of times ratings point of 1.0 on air gap line and no-load characteristic and 1.2 times of ratings points.
Wherein, first can click at 1.0 times of ratings and fetch data, and then click at 1.2 times of ratings and fetch data, finally according to two groups of data acquisition saturation coefficients.
Step 14, obtains rated excitation standard voltage value according to the rated exciting current on air gap line and rotor resistance.
Wherein, determine that the process of rated excitation standard voltage value can comprise: first obtain rotor resistance value according to rated voltage and the rated current of generator, then the exciting current value that this rated voltage is corresponding on this air gap line is determined, finally according to this rotor resistance value and this exciting current value determination off-load excitation voltage standard value.
Be described in detail below by the defining method of specific embodiment to described parameters of electric power system:
Embodiment one
The present embodiment, for " generator no-load characteristic " tracing analysis, is described the defining method of described parameters of electric power system, and shown in composition graphs 2, described method comprises:
Step 21, determines horizontal ordinate and the ordinate of no-load characteristic.
Wherein, horizontal ordinate and ordinate can be determined according to the size of the rated excitation voltage of the generator that will analyze and rated exciting current, such as the minimum value of rated excitation voltage can be set to 0V, maximal value is set to 30kV, the minimum value of rated exciting current is set to 0A, maximal value is set to 2000A.
In addition, horizontal ordinate can also be set to rated exciting current, ordinate be set to rated excitation voltage, and several scale values are set between the minimum and maximum, such as 200A is set to a rated exciting current scale, 1kV is set to a rated excitation voltage calibration.
Step 22, obtains the no-load characteristic data of generator or the exciter of surveying and carries out data detection.
The effect carrying out no-load characteristic data detection is the noise checked out in data, to ensure the slope consistance of air gap line, makes air gap line be straight line, instead of broken line.Wherein, shown in the process composition graphs 3 no-load characteristic data being carried out to data detection, comprising:
Step 221, selected point (Ug from no-load characteristic data
n-1, If
n-1) and (Ug
n, If
n), and calculate the slope K of two points
1.
Step 222, selected point (Ug from no-load characteristic data
n, If
n) and (Ug
n+1, If
n+1), and calculate the slope K of two points
2.
Step 223, compares K
1and K
2if, K
1>=K
2, then point (Ugn+1, Ifn+1) is not noise, if K
1< K
2, then point (Ugn+1, Ifn+1) is noise.
Step 224, going out slope by least square fitting is K
1straight line on new point (U`g
n+1, I`f
n+1), to replace former noise (Ug
n+1, If
n+1).
In addition, before carrying out data detection, raw data can also be retained, in order to using in follow-up flow process.
Step 23, sets up no-load characteristic according to the no-load characteristic data after eliminating noise.
Total data point in no-load characteristic data to be tested and after eliminating noise, no-load characteristic can set up according to the no-load characteristic data after eliminating noise.Such as, can be 30kV in maximum rated field voltage value, maximum rated exciting current value is 2000A, ordinate scale is 1kV, no-load characteristic that horizontal ordinate scale is the built-in vertical 1.05 times of ratings as shown in Figure 4 of coordinate system of 200A, then simulate ratings at the no-load characteristic of 1.05 times to 1.2 times according to the plots changes of this no-load characteristic.Wherein, shown in Fig. 5 is the no-load characteristic of 1.2 times of ratings.
Step 24, sets up air gap line according to no-load characteristic.
In the coordinate system set up by step 21, set up air gap line as described in Figure 6 in relevant position in the coordinate system according to no-load characteristic.
Step 25, according to the data acquisition saturation coefficient of times ratings point of 1.0 on air gap line and no-load characteristic and 1.2 times of ratings points.
Wherein, 1.0 times of saturation coefficients obtain by following formula:
Sg1.0＝(Ifa-Ifb)/Ifb
Ifa in formula represents load current value corresponding on the no-load characteristic of 1.0 times of load voltage values, and Ifb represents load current value corresponding on the air gap line of 1.0 times of load voltage values;
1.2 times of saturation coefficients obtain by following formula:
Sg1.2＝(Ifa’-Ifb’)/Ifb’
Ifa ' in formula represents load current value corresponding on the no-load characteristic of 1.2 times of load voltage values; Ifb ' represents load current value corresponding on the air gap line of 1.2 times of load voltage values.
Step 26, obtains rated excitation standard voltage value according to the rated exciting current on air gap line and rotor resistance.
Wherein, the process determining rated excitation standard voltage value as shown in Figure 7, comprising:
Step 261, obtains rotor resistance value according to rated voltage and the rated current of generator.
This rotor resistance value Rf
bobtain by following formulae discovery: Rf
b=Ug
n/ If
n.Ug wherein
nrepresent rated voltage, If
nrepresent the rated current of generator.
Step 262, determines the exciting current value that rated voltage is corresponding on air gap line.
At acquisition rated voltage Ug
nafter, corresponding point determination exciting current If on the air gap line can set up in step 24
b.
Step 263, according to rotor resistance value and exciting current value determination off-load excitation voltage standard value.
Off-load excitation voltage standard value obtains by following formulae discovery: Uf
b=If
b* Rf
b, Uf wherein
brepresent off-load excitation voltage standard value.
What the present embodiment proposed is the analytical approach of " generator no-load characteristic ", and the method analyzed as " exciter no-load characteristic " and " exciter load characteristic " etc. is similar to the analytical approach of " generator no-load characteristic ", therefore no longer depositedly states.
Adopt the technical scheme that the present embodiment provides, by the no-load characteristic data of acquisition are set up no-load characteristic, and set up there is the air gap line of unified slope, thus can accurately obtain comprise saturation coefficient, rated excitation standard voltage value 1.05 times of ratings until parameters of electric power system in 1.2 times of nominal value range.
Embodiment two
Present embodiments provide a kind of determining device of parameters of electric power system, shown in composition graphs 8, comprising:
Unloaded special efficacy curve sets up unit 81, for the no-load characteristic data of the generator or exciter that obtain actual measurement, and sets up no-load characteristic;
Unit 82 set up by air gap line, for setting up air gap line according to no-load characteristic;
Saturation coefficient acquiring unit 83, for the data acquisition saturation coefficient according to times ratings point of 1.0 on air gap line and no-load characteristic and 1.2 times of ratings points;
Normal voltage acquiring unit 84, for obtaining rated excitation standard voltage value according to the rated exciting current on air gap line and rotor resistance.
Wherein, set up unit 81 at unloaded special efficacy curve to comprise:
Noise eliminates subelement, for carrying out data detection to described no-load characteristic data and noise being eliminated;
Air gap line data acquisition subelement, for according to eliminating the no-load characteristic data acquisition air gap line data after noise;
Unit set up by air gap line, for setting up air gap line according to described air gap line data.
Wherein, eliminate subelement in noise to comprise:
Slope determination module, for determining the slope value of at least two points according to described no-load characteristic data;
Noise determination module, for determining whether there is noise according to the slope value of described at least two points;
Noise cancellation module, if for determining at least one noise, then obtains fitting data point by described no-load characteristic data fitting, and the noise in described no-load characteristic data is replaced with described fitting data point.
Wherein, comprise at normal voltage acquiring unit 84:
Resistance value determination subelement, for obtaining rotor resistance value according to rated voltage and the rated current of generator;
Exciting current value determination subelement, for determining the exciting current value that described rated voltage is corresponding on described air gap line;
Field voltage value determination subelement, for determining described off-load excitation voltage standard value according to described rotor resistance value and described exciting current value.
Wherein, described device also comprises:
Extreme value determining unit, for determining the maximal value of described rated exciting current and rated excitation voltage.
Adopt the technical scheme that the present embodiment provides, by the no-load characteristic data of acquisition are set up no-load characteristic, and set up there is the air gap line of unified slope, thus can accurately obtain comprise saturation coefficient, rated excitation standard voltage value 1.05 times of ratings until parameters of electric power system in 1.2 times of nominal value range.
This embodiment is clearly and completely described technical scheme of the present invention, and embodiment is wherein only a part of embodiment of the present invention, and is not whole embodiments.Based on the embodiment in the present invention, other embodiments all that those skilled in the art are not obtaining under the prerequisite of creative work all belong to protection scope of the present invention.
Claims (10)
1. a defining method for parameters of electric power system, is characterized in that, comprising:
Obtain the generator of actual measurement or the no-load characteristic data of exciter, and set up no-load characteristic;
Air gap line is set up according to described no-load characteristic;
According to the data acquisition saturation coefficient of 1.0 times of ratings points on described air gap line and no-load characteristic and 1.2 times of ratings points;
Rated excitation standard voltage value is obtained according to the rated exciting current on described air gap line and rotor resistance.
2. the method for claim 1, is characterized in that, described no-load characteristic of setting up comprises:
Data detection is carried out to described no-load characteristic data and noise is eliminated;
According to the no-load characteristic data acquisition air gap line data eliminated after noise;
Air gap line is set up according to described air gap line data.
3. method as claimed in claim 2, is characterized in that, carries out data detection and noise eliminated comprising described no-load characteristic data:
The slope value of at least two points is determined according to described no-load characteristic data;
Slope value according to described at least two points determines whether there is noise;
If determine at least one noise, then obtain fitting data point by described no-load characteristic data fitting, and the noise in described no-load characteristic data is replaced with described fitting data point.
4. the method for claim 1, is characterized in that, obtains rated excitation standard voltage value comprise according to the rated exciting current on described air gap line and rotor resistance:
Rotor resistance value is obtained according to rated voltage and the rated current of generator;
Determine the exciting current value that described rated voltage is corresponding on described air gap line;
Described off-load excitation voltage standard value is determined according to described rotor resistance value and described exciting current value.
5. the method for claim 1, is characterized in that, before setting up no-load characteristic, described method also comprises:
Determine the maximal value of described rated exciting current and rated excitation voltage.
6. a determining device for parameters of electric power system, is characterized in that, comprising:
Unloaded special efficacy curve sets up unit, for the no-load characteristic data of the generator or exciter that obtain actual measurement, and sets up no-load characteristic;
Unit set up by air gap line, for setting up air gap line according to described no-load characteristic;
Saturation coefficient acquiring unit, for the data acquisition saturation coefficient according to 1.0 times of ratings points on described air gap line and no-load characteristic and 1.2 times of ratings points;
Normal voltage acquiring unit, for obtaining rated excitation standard voltage value according to the rated exciting current on described air gap line and rotor resistance.
7. device as claimed in claim 6, is characterized in that, set up unit comprise at described unloaded special efficacy curve:
Noise eliminates subelement, for carrying out data detection to described no-load characteristic data and noise being eliminated;
Air gap line data acquisition subelement, for according to eliminating the no-load characteristic data acquisition air gap line data after noise;
Unit set up by air gap line, for setting up air gap line according to described air gap line data.
8. device as claimed in claim 7, is characterized in that, eliminates subelement comprise in described noise:
Slope determination module, for determining the slope value of at least two points according to described no-load characteristic data;
Noise determination module, for determining whether there is noise according to the slope value of described at least two points;
Noise cancellation module, if for determining at least one noise, then obtains fitting data point by described no-load characteristic data fitting, and the noise in described no-load characteristic data is replaced with described fitting data point.
9. device as claimed in claim 6, is characterized in that, comprise at described normal voltage acquiring unit:
Resistance value determination subelement, for obtaining rotor resistance value according to rated voltage and the rated current of generator;
Exciting current value determination subelement, for determining the exciting current value that described rated voltage is corresponding on described air gap line;
Field voltage value determination subelement, for determining described off-load excitation voltage standard value according to described rotor resistance value and described exciting current value.
10. device as claimed in claim 6, it is characterized in that, described device also comprises:
Extreme value determining unit, for determining the maximal value of described rated exciting current and rated excitation voltage.
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| CN105808967A (en) * | 2016-04-06 | 2016-07-27 | 国家电网公司 | Exciter saturation coefficient computing method based on secant iteration method |
| CN111257749A (en) * | 2018-11-30 | 2020-06-09 | 华中科技大学 | Offline measurement method for parameters of linear induction motor |
| CN111832754A (en) * | 2019-07-19 | 2020-10-27 | 郑州大学 | Method for detecting abnormality of pressure feedback signal of constant-pressure water supply system |
| CN112383252A (en) * | 2020-10-30 | 2021-02-19 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
| CN115598530A (en) * | 2022-11-29 | 2023-01-13 | 南方电网调峰调频发电有限公司（Cn） | Method and device for evaluating no-load characteristic of generator, electronic equipment and storage medium |
| CN117148147A (en) * | 2023-10-26 | 2023-12-01 | 南方电网调峰调频发电有限公司 | Motor performance parameter determining method based on DC attenuation method of any rotor position |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111257749A (en) * | 2018-11-30 | 2020-06-09 | 华中科技大学 | Offline measurement method for parameters of linear induction motor |
| CN111832754A (en) * | 2019-07-19 | 2020-10-27 | 郑州大学 | Method for detecting abnormality of pressure feedback signal of constant-pressure water supply system |
| CN112383252A (en) * | 2020-10-30 | 2021-02-19 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
| CN112383252B (en) * | 2020-10-30 | 2022-05-06 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
| CN115598530A (en) * | 2022-11-29 | 2023-01-13 | 南方电网调峰调频发电有限公司（Cn） | Method and device for evaluating no-load characteristic of generator, electronic equipment and storage medium |
| CN117148147A (en) * | 2023-10-26 | 2023-12-01 | 南方电网调峰调频发电有限公司 | Motor performance parameter determining method based on DC attenuation method of any rotor position |
| CN117148147B (en) * | 2023-10-26 | 2024-03-05 | 南方电网调峰调频发电有限公司 | Motor performance parameter determining method based on DC attenuation method of any rotor position |
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Application publication date: 20160316 |