CN113608144A - Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof - Google Patents
Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof Download PDFInfo
- Publication number
- CN113608144A CN113608144A CN202110780954.9A CN202110780954A CN113608144A CN 113608144 A CN113608144 A CN 113608144A CN 202110780954 A CN202110780954 A CN 202110780954A CN 113608144 A CN113608144 A CN 113608144A
- Authority
- CN
- China
- Prior art keywords
- current
- short
- armature winding
- sampling
- exciter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005070 sampling Methods 0.000 claims abstract description 75
- 238000012545 processing Methods 0.000 claims abstract description 62
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims description 21
- 238000007781 pre-processing Methods 0.000 claims description 14
- 238000004458 analytical method Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000000737 periodic effect Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003797 telogen phase Effects 0.000 description 1
Images
Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The invention relates to a brushless exciter and a method for quickly judging short-circuit fault of a rotating armature winding thereof, comprising the following steps: sampling the exciting current of a stator exciting winding of the brushless exciter to obtain sampling current; analyzing and processing the sampling current to obtain primary processing data; calculating according to the primary processing data and the sampling current to obtain secondary processing data; and judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data. According to the invention, the exciting current of the stator exciting winding is sampled and calculated, and whether the short-circuit fault of the rotating armature winding of the exciter occurs can be rapidly judged according to the data obtained by calculation, so that the effective on-line monitoring and protection of the short-circuit fault of the rotating armature winding of the brushless exciter can be realized, and the safety and reliability of the brushless exciter can be improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a brushless exciter and a method for quickly judging short-circuit faults of a rotating armature winding of the brushless exciter.
Background
The brushless exciter is widely applied to a high-capacity nuclear power generating set, realizes reliable protection of content faults of the high-capacity nuclear power generating set, and has important significance for guaranteeing safe operation of the large-scale generating set. However, the brushless exciter operates in a 'weak protection' state, only simple stator overcurrent protection is provided, and no corresponding monitoring or protection means is provided for internal faults of the stator and the rotor, so that many events caused by the internal faults of the exciter occur on the site, and therefore, reliable protection for the internal faults of the brushless exciter is very necessary.
A rotating armature winding short circuit fault is one of the typical faults in a brushless exciter, the fault is rapidly worsened, the level of the field current supplied by the exciter to the main generator is reduced, and the heat generated by the large short circuit current at the pin of the fault may burn the winding or even the motor, with serious consequences. Generator set shutdown events caused by exciter rotating armature winding faults are sometimes encountered in the field. For example, a turn-to-turn short circuit fault in the rotating armature assembly exciter of the 4 th unit of a certain power plant in a certain year first causes the turbine to trip. Without a corresponding fault protection device, the fault is further exacerbated, resulting in multiple protective actions of the main generator, and ultimately in a main generator rotor ground protection action. Since faults evolve rapidly, a rapid method of fault diagnosis needs to be studied.
Disclosure of Invention
The present invention is directed to a brushless exciter and a method for rapidly determining a short-circuit fault of a rotating armature winding thereof, which overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for quickly judging short-circuit fault of a rotating armature winding of a brushless exciter is constructed, and comprises the following steps:
sampling the exciting current of a stator exciting winding of the brushless exciter to obtain sampling current;
analyzing and processing the sampling current to obtain primary processing data;
calculating according to the primary processing data and the sampling current to obtain secondary processing data;
and judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the primary processing data includes: the DC quantity of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the analyzing the sampled current to obtain primary processing data includes:
and carrying out Fourier analysis on the excitation sampling circuit to obtain the direct current quantity of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the calculating according to the primary processing data and the sampling current to obtain secondary processing data includes:
subtracting the direct current quantity of the sampling current from the sampling current to obtain a preprocessing current;
calculating the pretreatment current to obtain an effective value of the pretreatment current;
the preprocessing current is an exciting current comprising odd harmonics and even harmonics; the effective value of the preprocessing current is the secondary processing data.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the calculating the preprocessing current to obtain the effective value of the preprocessing current includes:
and calculating the pretreatment current according to a preset formula to obtain an effective value of the pretreatment current.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the preset formula is:
t is the period of the current, T is the time, T is P/f0P is the number of pole pairs; f. of0Is the reference frequency.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the determining of the short-circuit fault of the rotating armature winding of the brushless exciter according to the primary processing data and the secondary processing data includes:
the effective value of the preprocessing current is subjected to quotient of the direct current quantity of the sampling current to obtain a first ratio;
taking the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current as ends to obtain a second ratio;
and judging the short-circuit fault of the rotating armature winding of the exciter according to the first ratio and the second ratio.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the determining the short-circuit fault of the rotating armature winding of the brushless exciter according to the first ratio and the second ratio includes:
comparing the first ratio and the second ratio with a first reference value and a second reference value, respectively;
and judging whether the rotating armature winding of the exciter has short-circuit fault according to the comparison result.
In the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention, the determining whether the short-circuit fault of the rotating armature winding of the brushless exciter occurs according to the comparison result includes:
and if the first ratio is greater than or equal to the first reference value and the second ratio is greater than or equal to the second reference value, judging that the short-circuit fault of the rotating armature winding of the exciter occurs.
In the method for rapidly judging the short-circuit fault of the rotating armature winding of the brushless exciter, the first reference value is larger than the ratio of the total harmonic effective value and the direct-current quantity of the stator exciting current when the brushless exciter normally operates; the second reference value is greater than a ratio of a second harmonic to a third harmonic of a stator exciting current when a rotating diode of the brushless exciter fails in an open circuit.
The invention also provides a device for rapidly judging the short-circuit fault of the rotating armature winding of the brushless exciter, which comprises:
the sampling unit is used for sampling the exciting current of the stator exciting winding of the brushless exciter to obtain sampling current;
the analysis unit is used for analyzing and processing the sampling current to obtain primary processing data;
the calculation unit is used for calculating according to the primary processing data and the sampling current to obtain secondary processing data;
and the judging unit is used for judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
The present invention also provides a brushless exciter comprising:
a memory for storing a program;
and the processor is used for loading the program to execute the method for quickly judging the short-circuit fault of the rotating armature winding of the brushless exciter.
The present invention also provides a storage medium having a computer program stored thereon, which when executed by a processor, implements the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter as described above.
The implementation of the brushless exciter and the method for quickly judging the short-circuit fault of the rotating armature winding thereof has the following beneficial effects: the method comprises the following steps: sampling the exciting current of a stator exciting winding of the brushless exciter to obtain sampling current; analyzing and processing the sampling current to obtain primary processing data; calculating according to the primary processing data and the sampling current to obtain secondary processing data; and judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data. According to the invention, the exciting current of the stator exciting winding is sampled and calculated, and whether the short-circuit fault of the rotating armature winding of the exciter occurs can be rapidly judged according to the data obtained by calculation, so that the effective on-line monitoring and protection of the short-circuit fault of the rotating armature winding of the brushless exciter can be realized, and the safety and reliability of the brushless exciter can be improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart of a method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to an embodiment of the present invention;
FIG. 2 is a waveform of the field current of the stator field winding of a brushless exciter of the present invention;
fig. 3 is a schematic block diagram of a device for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flow chart of an alternative embodiment of the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention.
As shown in fig. 1, the method for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter comprises the following steps:
step S101, sampling the exciting current of the stator exciting winding of the brushless exciter to obtain the sampling current.
Wherein the sampling of the field current of the stator field winding may be performed at the brushless exciter end.
And S102, analyzing and processing the sampling current to obtain primary processing data.
Wherein, once processing data includes: the DC amount of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current.
Optionally, analyzing and processing the sampling current to obtain primary processing data includes: and carrying out Fourier analysis on the excitation sampling circuit to obtain the direct current quantity of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current. That is, the direct current amount, the effective value of the second harmonic, and the effective value of the third harmonic in the exciting current can be obtained by performing fourier analysis on the sampled current obtained by sampling.
And step S103, calculating according to the primary processing data and the sampling current to obtain secondary processing data.
In some embodiments, the calculating based on the primary processed data and the sampled current, and the obtaining the secondary processed data comprises: subtracting the direct current quantity of the sampling current from the sampling current to obtain a preprocessing current; calculating the pretreatment current to obtain an effective value of the pretreatment current; the preprocessing current is an exciting current comprising odd harmonics and even harmonics; the effective value of the preprocessing current is secondary processing data.
Optionally, calculating the pretreatment current to obtain an effective value of the pretreatment current includes:
and calculating the pretreatment current according to a preset formula to obtain an effective value of the pretreatment current. Wherein, the preset formula is as follows:
in the above formula, if′dIs a pretreatment current; i isf′dIs the effective value of the pretreatment current; t is the period of the current, T is the time, T is P/f0P is the number of pole pairs; f. of0Is the reference frequency. Wherein, the reference frequency is the reference frequency of the brushless exciter.
And step S104, judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
In some embodiments, determining the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data comprises: the effective value of the preprocessing current is subjected to quotient with the direct current quantity of the sampling current to obtain a first ratio; taking the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current as ends to obtain a second ratio; and judging the short-circuit fault of the rotating armature winding of the exciter according to the first ratio and the second ratio.
Optionally, the determining the short-circuit fault of the rotating armature winding of the exciter according to the first ratio and the second ratio includes: comparing the first ratio and the second ratio with a first reference value and a second reference value, respectively; and judging whether the rotating armature winding of the exciter has short-circuit fault according to the comparison result.
Wherein, judging whether the short-circuit fault of the rotating armature winding of the exciter exists according to the comparison result comprises the following steps: and if the first ratio is greater than or equal to the first reference value and the second ratio is greater than or equal to the second reference value, judging the short-circuit fault of the rotating armature winding of the exciter.
The first reference value is larger than the ratio of the total harmonic effective value and the direct current quantity of the stator exciting current when the brushless exciter normally operates; the second reference value is greater than a ratio of a second harmonic to a third harmonic of the stator field current at an open circuit fault of a rotating diode of the brushless exciter.
Specifically, the dc amount of the sampling current is: i isdcThe effective value of the second harmonic of the sampling current is: i is(2)Effective value of the third harmonic of the sampled current I(3)The preconditioning current is if′dThe effective value of the preconditioning current is If′d，ξ1And xi2A first reference value and a second reference value, respectively. Thus, respectively obtaining Idc、I(2)、I(3)And If′dThereafter, first and second ratios R1 and R2 are calculated, respectively, that is:
R1＝If′d/Idc；R2＝I(2)/I(3)。
further, R1 is related to xi1Comparing R2 with xi2In comparison, if R1 is more than or equal to xi1And R2 is more than or equal to xi2And judging that the short circuit fault of the rotating armature winding occurs in the exciter.
Short-circuit faults that may occur in the rotating armature winding of the brushless exciter can be classified into intra-phase short-circuit faults and inter-phase short-circuit faults. However, in any case, a fault loop is formed. Therefore, the theoretical analysis method for the harmonic characteristics of the stator exciting current under the condition of different types of short-circuit faults of the armature winding is similar.
When the exciter operates normally, the armature winding suddenly generates short-circuit fault, and analysis is started from the moment of fault generation. In the moment of fault, in order to keep the flux linkage in the closed loop from sudden change, corresponding non-periodic components can appear in the fault armature loop current, the rest phases of current can also be influenced to generate non-periodic components, and the armature currents of the phases are not symmetrical any more.
The aperiodic components in the armature fault loop current and the non-fault phase current produce fundamental and odd harmonic magnetomotive forces that rotate synchronously with the rotor. Because the sum of the induced electromotive forces of the fractional order armature reaction magnetomotive force and the even order armature reaction magnetomotive force in the stator exciting winding is zero, only the induction action of the fundamental wave and the odd order armature reaction harmonic magnetomotive force of 3,5 and the like in the stator exciting winding (the same below) needs to be considered. These harmonic magnetomotive forces will induce fundamental and odd harmonic currents in the stator excitation circuit. The harmonic induced current in the stator field winding can be written as
In the formula: mu.s1Is the number of harmonic induced currents, mu, in the stator field winding1＝1,3,5,...；
Is the effective value of the harmonic induced current in the stator field winding.
The exciting current will generate space harmonic magnetomotive force of each integral number, and the distribution of these magnetomotive force under each pole is the same, only under the adjacent pole due to the winding directionOn the contrary, each pair of poles is repeated once in space, so that the excitation magnetomotive force only comprises fundamental wave and odd-numbered spatial harmonic magnetomotive forces of 3,5 and the like, and mu in the stator excitation winding1V generated by subharmonic current1The subharmonic magnetomotive force can be expressed as
In the formula: v is1Number of times of space harmonic magnetomotive force generated for stator harmonic induced current, v1＝1,3,5,...；
The effective value of the space harmonic magnetomotive force generated by the stator harmonic induced current.
As can be seen from equation (2), μ in the stator exciting current1V generated by subharmonic current1The rotating speed of the magnetic harmonic magnetomotive force is mu1/ν1Multiple synchronous speed of rotation, relative to the speed of rotation of the rotor being (mu)1/ν1+ -1) times the synchronous speed, mu will be induced in the rotating armature winding1±ν1The subharmonic currents, i.e. the even-numbered series of harmonic currents in the rotating armature winding, will be present.
Similarly, the space harmonic magnetomotive force generated by the even harmonic current in the armature winding can also induce fundamental wave and odd harmonic current in the excitation winding, and the fundamental wave is taken as the main component. And by analogy, a closed-loop inductive relation chain is formed between the even harmonic current in the armature winding and the fundamental wave and the odd harmonic current in the excitation winding.
In fact, when an armature winding short-circuit fault occurs suddenly during normal operation of the exciter, the non-periodic component in the fault armature loop current also causes the flux linkage of the excitation loop to change. However, in order to keep the flux linkage of the excitation circuit from abrupt changes, additional aperiodic components may also be present in the excitation current.
The non-periodic component in the excitation loop current (including the DC component of the excitation current itself) generates a fundamental wave sum which is not moved in spaceThe odd harmonic magnetomotive force, the rotor rotates at the synchronous speed, and the fundamental wave and odd harmonic currents such as 3,5 and the like can be induced in the armature winding. Since the armature winding is not symmetrical any more, the armature induced current will generate fundamental wave and odd-order harmonic magnetomotive force of 3,5, etc. in space. Armature mu2(μ21,3, 5. -) sub-harmonic current generated v2The rotation speed of the subspaced harmonic magnetomotive force is mu2/ν2Multiple synchronous speed, induction of medium mu in stator field winding2±ν2The frequency-doubled harmonic current, i.e. a series of even harmonic currents induced in the stator excitation winding, is dominated by the 2 nd harmonic. Similarly, even harmonic currents in the field winding also induce fundamental and odd harmonic currents in the armature winding. And by analogy, a closed-loop inductive relation chain is formed between the even harmonic current in the excitation winding and the fundamental wave and the odd harmonic current in the armature winding.
In the transient process after the short-circuit fault occurs in the armature winding, the induction process caused by the non-periodic components in the armature current and the exciting current exists at the same time. Therefore, during transient state after fault, the stator exciting current contains harmonic waves except the direct current, the fundamental wave and the 2 nd harmonic wave are taken as the main components, and other higher harmonic waves are smaller. As the fault reaches a steady state, the non-periodic component in the armature current is attenuated to 0, and the harmonic currents of the stator and the rotor caused by the non-periodic component of the armature are also attenuated to 0. In the excitation loop, the non-periodic component is a constant value excitation current, and each harmonic current of the stator and the rotor caused by the excitation non-periodic component reaches a certain steady state value. Therefore, in a steady state, the excitation current contains a series of even harmonic currents, mainly the 2 nd harmonic, in addition to the dc component.
Therefore, the design of protection against short-circuit fault of the rotating armature winding of the multi-phase annular brushless exciter can be performed by utilizing the harmonic characteristics of the stator exciting current, and the detailed description is given below through specific calculation.
Taking a certain actual brushless exciter as an example, the short-circuit fault of the rotating armature winding, which suddenly occurs when the exciter normally operates, is calculated by using the established exciter finite element simulation model, and fig. 2 is a waveform of the exciting current of a stator of the certain actual brushless exciter. The waveform on the left side is the waveform of the transition process before and after the fault, when t is 0.02s, the short-circuit fault of the rotating armature winding occurs, then the waveform with t <0.02s represents the normal steady-state operation state before the fault, and the waveform with t >0.02s represents the transition process after the fault occurs; the right graph represents the steady state waveform after a fault. The stator exciting currents during normal operation, fault transient state and fault steady state of the exciter are subjected to Fourier analysis, and the analysis results are shown in table 1.
Table 1. results of fourier analysis of stator field current when a short circuit fault occurs in a rotating armature winding of a brushless exciter.
As can be seen from table 1, after the short-circuit fault of the rotating armature winding occurs in the brushless exciter, the obviously increased low-order harmonic appears in the stator exciting current in both the transient state process and the steady state process after the fault. In theory, these harmonics can be selected for fault monitoring and protection.
The ratio of the total harmonic effective value to the direct current value and the ratio of the 2-order harmonic effective value to the 3-order harmonic effective value in the stator exciting current are used as fault protection criteria, the reliability is high, and an effective way is provided for diagnosing and protecting short-circuit faults of the rotary armature winding.
Referring to fig. 3, there is shown a schematic block diagram of the device for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter according to the present invention. The quick judgment device can be applied to the quick judgment method for the short-circuit fault of the rotating armature winding of the brushless exciter disclosed by the embodiment of the invention.
As shown in fig. 3, the device for rapidly determining a short-circuit fault of a rotating armature winding of a brushless exciter comprises:
the sampling unit 301 is configured to sample an excitation current of a stator excitation winding of the brushless exciter to obtain a sampling current.
The analyzing unit 302 is configured to analyze the sampled current to obtain primary processing data.
And a calculating unit 303, configured to perform calculation according to the primary processing data and the sampling current to obtain secondary processing data.
And the judging unit 304 is used for judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
The present invention also provides a brushless exciter comprising:
a memory for storing a program;
the processor is used for loading a program to execute the method for quickly judging the short-circuit fault of the rotating armature winding of the brushless exciter according to the embodiment of the invention.
The invention also provides a storage medium, on which a computer program is stored, and the computer program is executed by a processor to realize the method for rapidly judging the short-circuit fault of the rotating armature winding of the brushless exciter disclosed by the embodiment of the invention.
According to the invention, only the stator exciting current in the stator exciting winding is collected from the end of the brushless exciter, the ratio of the effective value of the total harmonic to the direct current of the exciting current and the ratio of the second harmonic to the third harmonic are obtained through Fourier analysis and calculation, and then the values are respectively compared with the first reference value and the second reference value, so that the short-circuit fault of the rotary armature winding is rapidly judged based on the comparison result, and the effective online monitoring and protection of the short-circuit fault of the rotary armature winding of the brushless exciter are realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (13)
1. A method for rapidly judging short-circuit fault of a rotating armature winding of a brushless exciter is characterized by comprising the following steps:
sampling the exciting current of a stator exciting winding of the brushless exciter to obtain sampling current;
analyzing and processing the sampling current to obtain primary processing data;
calculating according to the primary processing data and the sampling current to obtain secondary processing data;
and judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
2. The method of claim 1, wherein the primary processing data comprises: the DC quantity of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current.
3. The method of claim 2, wherein the analyzing the sampled current to obtain primary processed data comprises:
and carrying out Fourier analysis on the excitation sampling circuit to obtain the direct current quantity of the sampling current, the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current.
4. The method of claim 3, wherein the calculating based on the primary processed data and the sampled current to obtain secondary processed data comprises:
subtracting the direct current quantity of the sampling current from the sampling current to obtain a preprocessing current;
calculating the pretreatment current to obtain an effective value of the pretreatment current;
the preprocessing current is an exciting current comprising odd harmonics and even harmonics; the effective value of the preprocessing current is the secondary processing data.
5. The method of claim 4, wherein the calculating the preconditioning current to obtain the effective value of the preconditioning current comprises:
and calculating the pretreatment current according to a preset formula to obtain an effective value of the pretreatment current.
6. The method of claim 5, wherein the predetermined formula is:
i′fdis a pretreatment current; i'fdIs the effective value of the pretreatment current; t is the period of the current, T is the time, T is P/f0P is the number of pole pairs; f. of0Is the reference frequency.
7. The method of claim 4, wherein the determining an exciter rotating armature winding short circuit fault based on the primary processed data and the secondary processed data comprises:
the effective value of the preprocessing current is subjected to quotient of the direct current quantity of the sampling current to obtain a first ratio;
taking the effective value of the second harmonic of the sampling current and the effective value of the third harmonic of the sampling current as ends to obtain a second ratio;
and judging the short-circuit fault of the rotating armature winding of the exciter according to the first ratio and the second ratio.
8. The method of claim 7, wherein the determining an exciter rotating armature winding short circuit fault based on the first ratio and the second ratio comprises:
comparing the first ratio and the second ratio with a first reference value and a second reference value, respectively;
and judging whether the rotating armature winding of the exciter has short-circuit fault according to the comparison result.
9. The method of claim 8, wherein the determining whether the short-circuit fault occurs in the exciter rotating armature winding according to the comparison comprises:
and if the first ratio is greater than or equal to the first reference value and the second ratio is greater than or equal to the second reference value, judging that the short-circuit fault of the rotating armature winding of the exciter occurs.
10. The method of claim 8, wherein the first reference value is larger than a ratio of an effective value of a total harmonic to a dc value of a stator exciting current when the brushless exciter is in normal operation; the second reference value is greater than a ratio of a second harmonic to a third harmonic of a stator exciting current when a rotating diode of the brushless exciter fails in an open circuit.
11. A device for rapidly judging short-circuit fault of a rotating armature winding of a brushless exciter is characterized by comprising:
the sampling unit is used for sampling the exciting current of the stator exciting winding of the brushless exciter to obtain sampling current;
the analysis unit is used for analyzing and processing the sampling current to obtain primary processing data;
the calculation unit is used for calculating according to the primary processing data and the sampling current to obtain secondary processing data;
and the judging unit is used for judging the short-circuit fault of the rotating armature winding of the exciter according to the primary processing data and the secondary processing data.
12. A brushless exciter, comprising:
a memory for storing a program;
a processor for loading the program to perform the method of fast determination of short circuit fault of brushless exciter rotating armature winding according to any of claims 1-10.
13. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a method for fast determination of a short-circuit fault in a rotating armature winding of a brushless exciter according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110780954.9A CN113608144A (en) | 2021-07-09 | 2021-07-09 | Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110780954.9A CN113608144A (en) | 2021-07-09 | 2021-07-09 | Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113608144A true CN113608144A (en) | 2021-11-05 |
Family
ID=78304393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110780954.9A Pending CN113608144A (en) | 2021-07-09 | 2021-07-09 | Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113608144A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087329A (en) * | 2010-11-19 | 2011-06-08 | 清华大学 | Method for judging turn-to-turn short circuit fault position and number of short circuit turns of steam turbine generator rotor |
| CN102636751A (en) * | 2012-04-26 | 2012-08-15 | 中国人民解放军海军工程大学 | Alternating-current brushless generator fault detection method based on exciter exciting current |
| CN103487719A (en) * | 2013-09-17 | 2014-01-01 | 东南大学 | Method for distinguishing winding fault types of permanent-magnet synchronous motor stator |
| CN108072812A (en) * | 2017-04-20 | 2018-05-25 | 苏州仙崴机电有限公司 | A kind of switched reluctance machines winding interturn short-circuit failure diagnosing method |
| CN109406987A (en) * | 2018-10-30 | 2019-03-01 | 深圳中广核工程设计有限公司 | Fault detection method, device and the storage medium of nuclear power station rotary rectifier bridge |
| CN109596936A (en) * | 2018-12-21 | 2019-04-09 | 许昌学院 | Aviation three-phase AC excitation system dual rotary diode open-circuit fault detection method |
| CN111650509A (en) * | 2020-05-12 | 2020-09-11 | 浙江浙能电力股份有限公司台州发电厂 | Fault judgment method and device for brushless excitation motor, computer equipment and medium |
| CN112162213A (en) * | 2020-08-25 | 2021-01-01 | 辽宁红沿河核电有限公司 | Excitation winding short-circuit fault detection method and device of multi-phase angular brushless excitation system |
| WO2021114507A1 (en) * | 2019-12-12 | 2021-06-17 | 南京南瑞继保电气有限公司 | Online fault detection method and device for armature side of brushless exciter |
| CN112986817A (en) * | 2019-12-12 | 2021-06-18 | 南京南瑞继保电气有限公司 | Brushless exciter exciting winding turn-to-turn short circuit fault on-line detection device and method |
-
2021
- 2021-07-09 CN CN202110780954.9A patent/CN113608144A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087329A (en) * | 2010-11-19 | 2011-06-08 | 清华大学 | Method for judging turn-to-turn short circuit fault position and number of short circuit turns of steam turbine generator rotor |
| CN102636751A (en) * | 2012-04-26 | 2012-08-15 | 中国人民解放军海军工程大学 | Alternating-current brushless generator fault detection method based on exciter exciting current |
| CN103487719A (en) * | 2013-09-17 | 2014-01-01 | 东南大学 | Method for distinguishing winding fault types of permanent-magnet synchronous motor stator |
| CN108072812A (en) * | 2017-04-20 | 2018-05-25 | 苏州仙崴机电有限公司 | A kind of switched reluctance machines winding interturn short-circuit failure diagnosing method |
| CN109406987A (en) * | 2018-10-30 | 2019-03-01 | 深圳中广核工程设计有限公司 | Fault detection method, device and the storage medium of nuclear power station rotary rectifier bridge |
| CN109596936A (en) * | 2018-12-21 | 2019-04-09 | 许昌学院 | Aviation three-phase AC excitation system dual rotary diode open-circuit fault detection method |
| WO2021114507A1 (en) * | 2019-12-12 | 2021-06-17 | 南京南瑞继保电气有限公司 | Online fault detection method and device for armature side of brushless exciter |
| CN112986817A (en) * | 2019-12-12 | 2021-06-18 | 南京南瑞继保电气有限公司 | Brushless exciter exciting winding turn-to-turn short circuit fault on-line detection device and method |
| CN111650509A (en) * | 2020-05-12 | 2020-09-11 | 浙江浙能电力股份有限公司台州发电厂 | Fault judgment method and device for brushless excitation motor, computer equipment and medium |
| CN112162213A (en) * | 2020-08-25 | 2021-01-01 | 辽宁红沿河核电有限公司 | Excitation winding short-circuit fault detection method and device of multi-phase angular brushless excitation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zafarani et al. | Interturn short-circuit faults in permanent magnet synchronous machines: An extended review and comprehensive analysis | |
| Bouzid et al. | New expressions of symmetrical components of the induction motor under stator faults | |
| Morinigo-Sotelo et al. | Reliable detection of rotor bars breakage in induction motors via MUSIC and ZSC | |
| Fonseca et al. | Stator faults modeling and diagnostics of line-start permanent magnet synchronous motors | |
| Alloui et al. | Online interturn short-circuit fault diagnosis in induction motors operating under unbalanced supply voltage and load variations, using the STLSP Technique | |
| Wieczorek et al. | Modelling of induction motor for simulation of internal faults | |
| CN102044862B (en) | Fault characteristic extraction method for hydrogenerator rotor winding turn-to-turn short circuit | |
| Gritli et al. | Vibration signature analysis for rotor broken bar diagnosis in double cage induction motor drives | |
| Wang et al. | A turn fault mitigation strategy based on current injection technique for a triple three-phase PMA SynRM | |
| Zhou et al. | Current harmonics in induction machine with closed-slot rotor | |
| Laadjal et al. | On-line diagnosis and discrimination of stator faults in six-phase induction motors, based on voltage symmetrical components | |
| Hao et al. | Modeling, analysis, and identification of armature winding interturn fault in multiphase brushless exciters | |
| Keyhani et al. | Maximum likelihood estimation of synchronous machine parameters from standstill time response data | |
| Zafar et al. | CUSUM based fault detection of stator winding short circuits in doubly-fed induction generator based wind energy conversion systems | |
| CN113608144A (en) | Brushless exciter and quick judging method for short-circuit fault of rotating armature winding thereof | |
| Li et al. | Diagnosis of rotor winding inter‐turn short‐circuit of hydro‐generator based on no‐load curve reverse calculation | |
| Härsjö et al. | Modeling and harmonic analysis of a permanent magnet synchronous machine with turn-to-turn fault | |
| Chen et al. | Time–frequency characteristics analysis and diagnosis of rotating rectifier faults in multiphase annular brushless system | |
| Hao et al. | Analysis of the interturn short circuits of stator field windings in multiphase angular brushless exciter at nuclear power plant | |
| He et al. | Diagnosis of stator short-circuit faults in series and parallel winding connections of closed-loop controlled PMSMs | |
| Chiver et al. | Comparative study on sudden short-circuit currents of a synchronous generator | |
| Li et al. | Research on interturn short circuit fault location of rotor winding in synchronous electric machines | |
| Hamidifar et al. | A novel approach to saturation characteristics modeling and its impact on synchronous machine transient stability analysis | |
| Wu et al. | Online diagnosis of broken rotor bar fault of squirrel‐cage induction motor using a magnetic field measuring coil | |
| Sotelo et al. | Reliable detection of rotor bars breakage in induction motors via MUSIC and ZSC methods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |