CN103217583A - Testing method of confirming synchronous reactance of permanent magnet generator through electric reactor - Google Patents
Testing method of confirming synchronous reactance of permanent magnet generator through electric reactor Download PDFInfo
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- CN103217583A CN103217583A CN2013101511993A CN201310151199A CN103217583A CN 103217583 A CN103217583 A CN 103217583A CN 2013101511993 A CN2013101511993 A CN 2013101511993A CN 201310151199 A CN201310151199 A CN 201310151199A CN 103217583 A CN103217583 A CN 103217583A
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Abstract
The invention relates to a testing method of confirming synchronous reactance of a permanent magnet generator through an electric reactor. The aim of confirming direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq of the permanent magnet generator is achieved. The testing method comprises the steps of drawing the running vector diagram of a pure conductive load of the permanent magnet generator, deducing the computational formula of the synchronous reactance Xd and the computational formula of the synchronous reactance Xq, carrying out testing of stator resistance Ra, a no-load test and a test with the electric reactor (the pure inductive load), and finally confirming the direct-axis synchronous reactance Xd and the quadrature axis synchronous reactance Xq of a winding. The testing method has an extremum property and a boundary characteristic, and provides forceful evidence for analyzing the permanent magnet generator.
Description
Technical field
The present invention relates to a kind of method of testing of determining the magneto synchronous reactance by reactor.
Background technology
Magneto alternator is one of most important equipment in the wind-powered electricity generation unit, and the magneto alternator synchronous reactance is to generator stable operation analysis, fault analysis and safeguard and overhaul all have vital role.Simultaneously, the magneto alternator synchronous reactance is to set up the magneto mathematical model, carries out the prerequisite and the basis of computer control and analysis.
Because the excitation of magneto alternator is constant, different with the type of conventional generator, the method for analyzing and testing its synchronous reactance has certain degree of difficulty, does not also have the method for testing at the magneto alternator synchronous reactance at present.
Summary of the invention
The objective of the invention is to set up the method for testing of determining the magneto synchronous reactance by reactor,, reach the purpose of determining magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq by this method of testing.Technical scheme of the present invention is: a kind of method of testing of determining the magneto synchronous reactance by reactor, it is characterized in that: adopt the reactor operation of magneto band pure inductance load, and finally determine magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, magneto alternator reactor load running equation and synchronous reactance computing formula are:
A) ignore the computing formula of stator direct current resistance
X
d=(E
0－U)/I （1）
In the formula:
E
0---be the no-load emf under the rated speed
U---be the terminal voltage value
B) computing formula of consideration stator direct current resistance
X
d＝（E
0－U·cosθ－I·cos(θ＋φ)·R
a）/I·sin(θ＋φ)
（2）
X
q＝（U·sinθ＋I·sin(θ＋φ)·R
a）/I·cos(θ＋φ)
（3）
In the formula:
I-magneto stator current;
U-terminal voltage;
E0-no-load emf;
Ra-stator resistance;
φ-power-factor angle;
θ-merit angle;
Id-direct-axis current;
Iq-friendship shaft current.
Test by magneto band reactor (pure inductance load), electric parameter stator current I, terminal voltage U, no-load emf E0, stator resistance Ra, power-factor angle φ, the merit angle θ of test, and the value of finally definite direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.Concrete steps are as follows:
Step 1: carry out the test of stator resistance Ra: stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature, so that when synchronous reactance is calculated, considers the influence of stator resistance;
Step 2: carry out no-load test: test no-load characteristic, no-load emf E
0And initial position angle: magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, the angle between promptly unloaded next phase voltage and the rotor-position;
Step 3: load is reactor (pure inductance) running test: magneto stator current I, terminal voltage U, power-factor angle φ, merit angle θ when measuring the reactor load, determine magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq;
Step 4, according to above method of testing, obtain each computing parameter, utilize formula (1) or formula (2), formula (3), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
The load running of magneto band pure inductance is special operating condition, and promptly output power is zero, and the electric current of output and voltage vector angle are 90 degree.The armature reaction that the stator current of magneto band pure inductance load produces, the direction that produces magnetic flux with rotor magnetic pole is opposite, and the effect that armature reaction produces is the strongest.The synchronous reactance of testing under this operating mode has extremum property and border characteristics, provides strong evidence for analyzing magneto.
Description of drawings
Fig. 1: operation vector plot during the load of magneto pure inductance.
Embodiment
As shown in Figure 1, be the operation vector plot of magneto pure inductance load.The magneto excitation produces magnetic field by fixing magnet steel, if its rotating speed is constant, it is constant that magnet steel produces the magnetic induction size in magnetic field.During the load running of magneto band pure inductance, the electric current of output and voltage vector angle are 90 degree.According to above characteristic, the operation vector plot of magneto when drawing the pure inductance load.
The vector plot of magneto during based on the three-phase steady-state short-circuit, the method of testing of magneto synchronous reactance is determined in foundation by reactor, electric parameter stator current I, terminal voltage U, no-load emf E0, stator resistance Ra, power-factor angle φ, the merit angle θ of test, and the value of finally definite direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.The computing formula of derivation pure inductance load synchronous reactance xd and Xq is:
A) ignore the computing formula of stator direct current resistance
Very little at the stator direct current resistance, under negligible situation, when the load of magneto was pure inductance (three-phase adjustable reactance device), the synchronous reactance xd value can be tried to achieve by formula:
X
d=(E
0－U)/I （1）
In the formula:
E
0---be the no-load emf under the rated speed,
U---be the terminal voltage value.
B) computing formula of consideration stator direct current resistance
When bigger, under situation that cannot ignore, calculate as follows at the stator direct current resistance:
X
d＝（E
0－U·cosθ－I·cos(θ＋φ)·R
a）/I·sin(θ＋φ)
（2）
X
q＝（U·sinθ＋I·sin(θ＋φ)·R
a）/I·cos(θ＋φ)
（3）
In the formula:
I-magneto stator current;
U-terminal voltage;
E0-no-load emf;
Ra-stator resistance;
φ-power-factor angle;
θ-merit angle;
Id-direct-axis current;
Iq-friendship shaft current.
Test by magneto band reactor (pure inductance load), electric parameter stator current I, terminal voltage U, no-load emf E0, stator resistance Ra, power-factor angle φ, the merit angle θ of test, and the value of finally definite direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, concrete steps are as follows:
Step 1, carry out the test of stator resistance Ra; Stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature.So that when synchronous reactance is calculated, consider the influence of stator resistance.Minitype permanent magnetism generator unit stator direct current resistance is bigger, when testing and calculating, considers the influence of stator direct current resistance, just can accurately determine synchronous reactance.
Step 2, the no-load test of carrying out: test no-load characteristic, no-load emf E
0And initial position angle; The magneto no-load curve is the relation curve of rotating speed and no-load voltage, and it is a straight line, has directly reacted the size that different rotating speeds lower magnetic steel magnetic pole produces electromotive force, synchronous reactance determine to depend on no-load curve; Magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, the angle between promptly unloaded next phase voltage and the rotor-position;
Step 3, to carry out load be reactor (pure inductance) running test: when load is pure inductance (three-phase adjustable reactance device), and magneto stator current I, terminal voltage U, power-factor angle φ, merit angle θ when measuring load.Utilize measuring accuracy to be higher than 0.5 grade electric quantity test instrument, can directly test stator current I, terminal voltage U, power-factor angle φ.Merit angle θ is angle poor of two tests, i.e. initial position angle under the phase voltage of testing during load and the zero load of angle between the rotor-position and test (angle between unloaded same phase voltage down and the rotor-position) poor;
Step 4, according to above method of testing, obtain each computing parameter.Ignore the stator direct current resistance, utilize formula (1); Consider the influence of stator direct current resistance, utilize formula (2), formula (3), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
Claims (1)
1. method of testing of determining the magneto synchronous reactance by reactor, it is characterized in that: adopt the reactor operation of magneto band pure inductance load, and finally determine magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, magneto alternator reactor load running equation and synchronous reactance computing formula are:
A) ignore the computing formula of stator direct current resistance
X
d=(E
0－U)/I （1）
In the formula:
E
0---be the no-load emf under the rated speed
U---be the terminal voltage value
B) computing formula of consideration stator direct current resistance
X
d＝（E
0－U·cosθ－I·cos(θ＋φ)·R
a）/I·sin(θ＋φ)
（2）
X
q＝（U·sinθ＋I·sin(θ＋φ)·R
a）/I·cos(θ＋φ)
（3）
In the formula:
I-magneto stator current;
U-terminal voltage;
E0-no-load emf;
Ra-stator resistance;
φ-power-factor angle;
θ-merit angle;
Id-direct-axis current;
Iq-friendship shaft current.
Test by magneto band reactor (pure inductance load), electric parameter stator current I, terminal voltage U, no-load emf E0, stator resistance Ra, power-factor angle φ, the merit angle θ of test, and the value of finally definite direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq, concrete steps are as follows:
Step 1, carry out the test of stator resistance Ra: stator resistance Ra is one of inscape of magneto vector plot, tests out its phase resistance, and carries out suitable correction according to temperature, so that when synchronous reactance is calculated, considers the influence of stator resistance;
Step 2, the no-load test of carrying out: test no-load characteristic, no-load emf E
0And initial position angle: magneto is under different rotating speeds, and its no-load emf difference, synchronous reactance also change thereupon, and the initial position angle under the zero load must be at first tested at the merit angle when determining load, the angle between promptly unloaded next phase voltage and the rotor-position;
Step 3, load are reactor (pure inductance) running test: magneto stator current I, terminal voltage U, power-factor angle φ, merit angle θ when measuring the reactor load, determine magneto direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq;
Step 4, according to above method of testing, obtain each computing parameter, utilize formula (1) or formula (2), formula (3), determine winding direct-axis synchronous reactance Xd and quadrature axis synchronous reactance Xq.
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| CN2013101511993A CN103217583A (en) | 2013-04-27 | 2013-04-27 | Testing method of confirming synchronous reactance of permanent magnet generator through electric reactor |
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|---|---|---|---|
| CN2013101511993A CN103217583A (en) | 2013-04-27 | 2013-04-27 | Testing method of confirming synchronous reactance of permanent magnet generator through electric reactor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267243A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for measuring parameters of inner potential and reactance of synchronous generator |
| CN105242117A (en) * | 2015-09-14 | 2016-01-13 | 南京师范大学 | Permanent magnet synchronous motor d-axis inductance and q-axis inductance measuring method |
| CN106908724A (en) * | 2017-03-02 | 2017-06-30 | 国家电网公司 | A kind of large-scale phase modifier scene no-load characteristic measurement method |
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|---|---|---|---|---|
| US5402080A (en) * | 1991-11-12 | 1995-03-28 | Mitsubishi Denki Kabushiki Kaisha | Method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine |
| CN1710439A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on voltage integration |
| CN1710438A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on small DC attenuation |
| CN101699300A (en) * | 2009-10-28 | 2010-04-28 | 上海电器科学研究所（集团）有限公司 | Method for testing direct axis reactance of built-in permanent magnet synchronous motor |
| CN102495287A (en) * | 2011-11-30 | 2012-06-13 | 徐州中矿大传动与自动化有限公司 | Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor |
-
2013
- 2013-04-27 CN CN2013101511993A patent/CN103217583A/en active Pending
Patent Citations (5)
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| US5402080A (en) * | 1991-11-12 | 1995-03-28 | Mitsubishi Denki Kabushiki Kaisha | Method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine |
| CN1710439A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on voltage integration |
| CN1710438A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on small DC attenuation |
| CN101699300A (en) * | 2009-10-28 | 2010-04-28 | 上海电器科学研究所（集团）有限公司 | Method for testing direct axis reactance of built-in permanent magnet synchronous motor |
| CN102495287A (en) * | 2011-11-30 | 2012-06-13 | 徐州中矿大传动与自动化有限公司 | Measurement method based on quadrature axis reactance measurement device of permanent-magnet synchronous motor |
Non-Patent Citations (3)
| Title |
|---|
| M.AZIZUR RAHMAN ET AL.: "Anaysis of Brushless Permanent Magnet Synchronous Motors", 《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》, vol. 43, no. 2, 30 April 1996 (1996-04-30), pages 256 - 267 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267243A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for measuring parameters of inner potential and reactance of synchronous generator |
| CN104267243B (en) * | 2014-10-08 | 2018-02-06 | 国家电网公司 | The measuring method and device of synchronous generator built-in potential and reactance parameter |
| CN105242117A (en) * | 2015-09-14 | 2016-01-13 | 南京师范大学 | Permanent magnet synchronous motor d-axis inductance and q-axis inductance measuring method |
| CN106908724A (en) * | 2017-03-02 | 2017-06-30 | 国家电网公司 | A kind of large-scale phase modifier scene no-load characteristic measurement method |
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Application publication date: 20130724 |