CN111323700B - Method and device for early warning of magnetic steel faults of generator set - Google Patents
Method and device for early warning of magnetic steel faults of generator set Download PDFInfo
- Publication number
- CN111323700B CN111323700B CN201811533621.0A CN201811533621A CN111323700B CN 111323700 B CN111323700 B CN 111323700B CN 201811533621 A CN201811533621 A CN 201811533621A CN 111323700 B CN111323700 B CN 111323700B
- Authority
- CN
- China
- Prior art keywords
- generator set
- current
- magnetic field
- magnetic steel
- field coefficient
- 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.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 138
- 239000010959 steel Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000004907 flux Effects 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- 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
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
A method and a device for early warning of magnetic steel faults of a generator set are provided. The method comprises the following steps: acquiring at least one set of historical data of voltage, current and rotating speed of each of the K generator sets, wherein K is more than or equal to 1; calculating a reference magnetic field coefficient of each generator set through at least one set of historical data of the obtained voltage, current and rotating speed of each generator set; calculating the current magnetic field coefficient of each generator set by using the obtained current data of the voltage, current and rotating speed of each generator set; calculating K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K generator sets; judging whether the magnetic steel fault exists in the specific generator set or not according to the K difference values and the reference magnetic field coefficient of the specific generator set in the K generator sets.
Description
Technical Field
The present disclosure relates to a method and an apparatus for early warning of a magnetic steel fault of a generator set, and more particularly, to a method and an apparatus for performing early warning of a magnetic steel fault based on historical data and current data of a voltage, a current and a rotational speed of the generator set.
Background
The generator structure of the generator set is an outer rotor and an inner stator structure, the outer rotor is composed of generator magnetic steel and a rotor support, the magnetic steel is used for providing excitation for the generator, the magnetic steel has the risk of falling off due to the process reasons and the working conditions of the site, and the generator magnetic steel is likely to demagnetize under the conditions of lightning stroke, overheat, generator armature reflection and the like, so that the problem of the generator magnetic steel needs to be warned to inform the site of paying attention to the problem set, checking and solving the problem, and the aim of reducing spare part loss of the wind turbine is fulfilled. The current magnetic flux of the generator can be calculated through the current, voltage, rotating speed and the like to compare with the magnetic flux when the magnetic steel does not have faults so as to judge whether the magnetic steel has faults, however, the number of the magnetic steels used for exciting the generator set is generally different from 1000 to 4000, if the magnetic flux change caused by the falling of the magnetic steels is very tiny, the noise in the outlet voltage measured by the motor is relatively large, and as a system, the voltage, the current, the rotating speed and other data measured by the generator are greatly influenced by temperature, humidity and the like, so that a method and a device capable of accurately early warning the magnetic steel faults are needed.
Disclosure of Invention
Aspects of the present disclosure will solve at least the problems and/or disadvantages described above and provide at least the advantages described below. Therefore, the invention aims to provide a method and a device for accurately pre-warning the magnetic steel faults of the generator set based on the obtained historical data and the current data of the voltage, the current and the rotating speed of the generator set.
The invention provides a method for early warning of magnetic steel faults of a generator set, which comprises the following steps: acquiring at least one set of historical data of voltage, current and rotating speed of each of the K generator sets, wherein K is more than or equal to 1; calculating a reference magnetic field coefficient of each generator set through at least one set of historical data of the obtained voltage, current and rotating speed of each generator set; calculating the current magnetic field coefficient of each generator set by using the obtained current data of the voltage, current and rotating speed of each generator set; calculating K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K generator sets; judging whether the specific generator sets have magnetic steel faults or not according to the K difference values and the reference magnetic field coefficient of the specific generator sets in the K generator sets, wherein the reference magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel when the magnetic steel of each generator set does not have faults, and the current magnetic field coefficient of each generator set indicates the magnitude of magnetic flux currently generated by the magnetic steel of each generator set.
Optionally, when k=1, the step of determining whether the magnetic steel fault exists in the specific generator set includes: calculating the ratio of the difference value between the current magnetic field coefficient and the reference magnetic field coefficient of the specific generator set to the reference magnetic field coefficient of the specific generator set; and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, the step of obtaining at least one set of historical data of voltage, current and rotational speed of each of the K generator sets includes: and selecting at least one set of historical data of the voltage, the current and the rotating speed of each generator set, wherein the voltage and the current of each generator set are respectively in linear relation with the rotating speed.
Optionally, when K is greater than or equal to 2, the step of determining whether the magnetic steel fault exists in the specific generator set of the K generator sets includes: calculating the average value of the K differences; calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
Optionally, the step of judging whether the magnetic steel fault exists in the specific generator set according to the ratio comprises the following steps: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, when K is greater than or equal to 2, the step of determining whether the magnetic steel fault exists in the specific generator set of the K generator sets includes: calculating an average value of M differences in the K differences, wherein M is less than K; calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
Optionally, the step of calculating an average value of M differences among the K differences includes: and sorting the K differences according to the size, selecting M differences among the sorted K differences, and calculating the average value of the selected M differences.
Optionally, the step of judging whether the magnetic steel fault exists in the specific generator set according to the ratio comprises the following steps: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, the K generator sets are in the same environment and are the same type of generator set.
Optionally, the reference magnetic field coefficient for each genset is calculated by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient, N, of the kth of the K generator sets k A number of sets of at least one set of historical data representing voltage, current and rotational speed of a kth one of the K sets of generators, R sk Represents the internal resistance of the kth generator set, u nk 、i nk 、ω nk The voltage, current and rotational speed in the nth set of historical data in the at least one set of historical data representing the voltage, current and rotational speed, respectively, of the kth of the K gensets.
Optionally, wherein the current magnetic field coefficient of each of the K gensets is calculated by the following equation:
wherein, psi is cur_k Representing the current magnetic field coefficient of the kth generator set, R sk Represents the internal resistance of the kth generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotational speed of the generator set, respectively, representing a set of current data for the kth generator set.
Another aspect of the present invention provides a device for early warning of a magnetic steel fault of a generator set, the device comprising: the data acquisition unit is configured to acquire at least one set of historical data of voltage, current and rotating speed of each of the K generator sets, wherein K is more than or equal to 1; a processor configured to perform the operations of: calculating a reference magnetic field coefficient of each generator set through at least one set of historical data of the voltage, the current and the rotating speed of each generator set acquired by the data acquisition unit; calculating the current magnetic field coefficient of each generator set by using the obtained current data of the voltage, current and rotating speed of each generator set; calculating K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K generator sets; judging whether the specific generator sets have magnetic steel faults or not according to the K difference values and the reference magnetic field coefficient of the specific generator sets in the K generator sets, wherein the reference magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel when the magnetic steel of each generator set does not have faults, and the current magnetic field coefficient of each generator set indicates the magnitude of magnetic flux currently generated by the magnetic steel of each generator set.
Optionally, when k=1, the step of determining whether the magnetic steel fault exists in the specific generator set includes: calculating the ratio of the difference value between the current magnetic field coefficient and the reference magnetic field coefficient of the specific generator set to the reference magnetic field coefficient of the specific generator set; and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, the step of obtaining at least one set of historical data of voltage, current and rotational speed of each of the K generator sets includes: and selecting at least one set of historical data of the voltage, the current and the rotating speed of each generator set, wherein the voltage and the current of each generator set are respectively in linear relation with the rotating speed.
Optionally, when K is greater than or equal to 2, the step of determining whether the magnetic steel fault exists in the specific generator set of the K generator sets includes: calculating the average value of the K differences; calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
Optionally, the step of judging whether the magnetic steel fault exists in the specific generator set according to the ratio comprises the following steps: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, when K is greater than or equal to 2, the step of determining whether the magnetic steel fault exists in the specific generator set of the K generator sets includes: calculating an average value of M differences in the K differences, wherein M is less than K; calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
Optionally, the step of calculating an average value of M differences among the K differences includes: and sorting the K differences according to the size, selecting M differences among the sorted K differences, and calculating the average value of the selected M differences.
Optionally, the step of judging whether the magnetic steel fault exists in the specific generator set according to the ratio comprises the following steps: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
Optionally, the K generator sets are in the same environment and are the same type of generator set.
Optionally, the reference magnetic field coefficient for each genset is calculated by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient, N, of the kth of the K generator sets k Representing the electricity of the kth of the K gensetsThe number of sets of at least one set of historical data of voltage, current and rotational speed, R sk Represents the internal resistance of the kth generator set, u nk 、i nk 、ω nk The voltage, current and rotational speed in the nth set of historical data in the at least one set of historical data representing the voltage, current and rotational speed, respectively, of the kth of the K gensets.
Optionally, wherein the current magnetic field coefficient of each of the K gensets is calculated by the following equation:
wherein, psi is cur_k Representing the current magnetic field coefficient of the kth generator set, R sk Represents the internal resistance of the kth generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotational speed of the generator set, respectively, representing a set of current data for the kth generator set.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description when taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart illustrating a method of permanent magnet direct drive generator set magnetic steel fault pre-warning according to an embodiment of the present disclosure;
FIG. 2 is a graph illustrating voltage, current, and rotational speed relationships of a permanent magnet direct drive generator set according to an embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating a method of determining whether a magnetic steel fault exists for a particular permanent magnet direct drive genset of the K permanent magnet direct drive gensets when K+.gtoreq.2, in accordance with an embodiment of the disclosure;
FIG. 4 is a flow chart illustrating a method of determining whether a magnetic steel fault exists in a particular permanent magnet direct drive genset of the K permanent magnet direct drive gensets when K+.gtoreq.2, in accordance with another embodiment of the present disclosure; and
fig. 5 is a block diagram illustrating an apparatus for permanent magnet direct drive generator set magnetic steel fault pre-warning according to an embodiment of the present disclosure.
Throughout the drawings, it should be noted that the same reference numerals are used to describe the same or similar elements, features and structures.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments will be described below in order to explain the present invention by referring to the figures.
Fig. 1 shows a flowchart of a method for early warning of a permanent magnet direct drive generator set of a magnetic steel fault according to an exemplary embodiment of the present invention.
Referring to FIG. 1, at step S10, at least one set of historical data of voltage, current and rotational speed of each of the K permanent magnet direct drive generator sets is obtained, wherein K is greater than or equal to 1.
As an example, a sensor for measuring data of current, voltage, rotation speed, etc. of the permanent magnet direct-drive generator sets in real time may be installed for each permanent magnet direct-drive generator set to monitor an operation state of the permanent magnet direct-drive generator sets, and history data of the measured current, voltage, rotation speed, etc. of the permanent magnet direct-drive generator sets and current data may be stored in a memory, so that at least one set of history data of the voltage, current, rotation speed, etc. of each of K permanent magnet direct-drive generator sets may be acquired from the memory for subsequent use, wherein K is not less than 1. For example, the current, voltage and rotational speed data of the permanent magnet direct drive generator set may be obtained in five days of the time window, that is, the current, voltage and rotational speed data of the permanent magnet direct drive generator set in the previous five days may be obtained as historical data for subsequent use.
Fig. 2 is a graph illustrating voltage, current, and rotational speed relationships of a permanent magnet direct drive generator set according to an embodiment of the present disclosure.
Referring to fig. 2, according to the relationship between the voltage and the current and the rotation speed, the relationship curve can be divided into a start region, a linear region and a field weakening control region according to the relationship between the voltage and the current and the rotation speed, wherein the voltage and the current respectively have a linear relationship with the rotation speed in the linear region. Specifically, referring to fig. 2, when the rotation speed is below 8 rpm, the generator is in an idle state, the current is 0, the area is a starting area, when the rotation speed is 8 rpm to 13 rpm, the generated voltage and the current of the permanent magnet direct drive generator set respectively increase linearly with the increase of the rotation speed, that is, the voltage and the current respectively have a linear relation with the rotation speed, the area is a linear area, when the rotation speed is 13 rpm to 15 rpm, the generator voltage is truncated, and the area is a field weakening control area.
As an example, the historical data of the voltage, the current and the rotation speed in the linear region may be selected for subsequent use, that is to say, at least one set of historical data of the voltage, the current and the rotation speed of each permanent magnet direct-drive generator set, which are respectively in a linear relationship, is obtained from the stored historical data of the voltage, the current and the rotation speed of each permanent magnet direct-drive generator set, for subsequent use. As an example, at least one set of historical data of each permanent magnet direct drive generator set, in which the voltage, current and rotational speed are respectively in a linear relationship, may be obtained from the stored historical data of the voltage, current and rotational speed of each permanent magnet direct drive generator set over the previous five days for subsequent use.
As an example, at least one set of historical data for the rotational speed of each permanent magnet direct drive generator set satisfying a voltage, current, and rotational speed of 9 to 11 revolutions per second may be selected for subsequent use.
In step S20, a reference magnetic field coefficient of each permanent magnet direct-drive generator set is calculated according to at least one set of history data of the obtained voltage, current and rotation speed of each permanent magnet direct-drive generator set.
Specifically, since the voltage, the current and the rotation speed of the permanent magnet direct-drive generator set are related to the magnetic flux of the magnetic steel, a parameter indicating the magnitude of the magnetic flux generated by the magnetic steel can be defined by the obtained voltage, current and rotation speed, for example, the magnitude of the magnetic flux generated when the magnetic steel of each permanent magnet direct-drive generator set fails can be indicated by calculating the reference magnetic field coefficient of each permanent magnet direct-drive generator set according to at least one set of history data of the obtained voltage, current and rotation speed of each permanent magnet direct-drive generator set, that is, the calculated reference magnetic field coefficient of each permanent magnet direct-drive generator set indicates the magnitude of the magnetic flux generated by the magnetic steel when the magnetic steel of each permanent magnet direct-drive generator set fails.
As an example, the reference magnetic field coefficient for each permanent magnet direct drive generator set may be calculated by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient of the kth permanent magnet direct-drive generator set in the K permanent magnet direct-drive generator sets, N k The number of groups representing at least one group of historical data of voltage, current and rotating speed of the kth permanent magnet direct-drive generator set in the K permanent magnet direct-drive generator sets, R sk Represents the internal resistance of the kth permanent magnet direct-drive generator set, u nk 、i nk 、ω nk And respectively representing the voltage, the current and the rotating speed in the nth set of historical data in at least one set of historical data of the voltage, the current and the rotating speed of the kth permanent magnet direct drive generator set in the K permanent magnet direct drive generator sets.
In step S30, the current magnetic field coefficient of each permanent magnet direct-drive generator set is calculated by using the obtained set of current data of the voltage, current and rotation speed of each permanent magnet direct-drive generator set.
As an example, a set of current data for the voltage, current, and rotational speed of each permanent magnet direct drive generator set may be obtained by a sensor for measuring the voltage, current, and rotational speed of each permanent magnet direct drive generator set.
As an example, the reference magnetic field coefficient for each permanent magnet direct drive generator set may be defined by the following formula:
wherein, psi is cur_k Representing the current magnetic field coefficient, R of the kth permanent magnet direct-drive generator set sk Represents the internal resistance of the kth permanent magnet direct-drive generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotating speed of the permanent magnet direct-drive generator set of a group of current data of the kth permanent magnet direct-drive generator set are respectively represented.
In step S40, K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K permanent magnet direct-drive generator sets are calculated.
Specifically, the difference between the reference magnetic field coefficient and the current magnetic field coefficient of each permanent magnet direct-drive generator set is calculated through the previous calculation.
In step S50, whether the specific permanent magnet direct-drive generator set has a magnetic steel fault is determined according to the K difference values and the reference magnetic field coefficient of the specific permanent magnet direct-drive generator set in the K permanent magnet direct-drive generator sets.
As an example, when k=1, that is, when there is only one permanent magnet direct-drive generator set, a ratio of a difference value between a current magnetic field coefficient and a reference magnetic field coefficient of the permanent magnet direct-drive generator set to a reference magnetic field coefficient of the permanent magnet direct-drive generator set may be calculated, and whether a magnetic steel fault exists in a specific permanent magnet direct-drive generator set may be determined according to whether the ratio is greater than or equal to a threshold value, where the threshold value is preset. As an example, when the ratio is determined to be greater than or equal to a threshold value, it is determined that a magnetic steel fault exists in the permanent magnet direct-drive generator set, and when the ratio is determined to be less than the threshold value, it is determined that no magnetic steel fault exists in the permanent magnet direct-drive generator set.
When k=1 is described above, the relative variation of the magnetic field coefficient of the single permanent magnet direct-drive generator set is calculated to determine whether the magnetic steel of the permanent magnet direct-drive generator set has faults, and because environmental factors such as temperature, humidity and the like affect the measurement of voltage, current and rotating speed, the early warning of the magnetic steel faults only through the voltage, current and rotating speed data of the single permanent magnet direct-drive generator set has certain limitation on accuracy. For example, modern wind power stations are often composed of several to hundreds of wind power generator sets of the same type, and the influence of the environmental factors of a single wind field on the magnetic flux coefficient of each wind power generator set is the same, so that the interference can be removed through the change trend of the whole field to improve the early warning accuracy of magnetic steel faults. The following describes a method for more precisely judging whether or not there is a fault in the magnetic steel by removing the trend of the magnetic field coefficient variation in the whole field.
FIG. 3 illustrates a flow chart of a method of determining whether a magnetic steel fault exists for a particular permanent magnet direct drive genset of the K permanent magnet direct drive gensets when K+.2, in accordance with an embodiment of the disclosure.
Referring to fig. 3, in step S301, an average value of K differences is calculated; in step S302, calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of the specific permanent magnet direct-drive generator set and the average value; and in step S303, whether the specific permanent magnet direct-drive generator set has a magnetic steel fault is determined according to a ratio of δ to a reference magnetic field coefficient of the specific permanent magnet direct-drive generator set, which may be set in advance, for example, when the ratio is greater than or equal to a threshold, whether the specific permanent magnet direct-drive generator set has a magnetic steel fault is determined according to whether the ratio is greater than or equal to a threshold. By the method, whether any one of the K permanent magnet direct-drive generator sets has a magnetic steel fault can be judged.
FIG. 4 illustrates a flow chart of a method of determining whether a magnetic steel fault exists in a particular permanent magnet direct drive genset of the K permanent magnet direct drive gensets when K+.2, according to another embodiment of the present disclosure.
Referring to fig. 4, in step S401, an average value of M differences among K differences is calculated, where M < K, and as an example, K differences may be sorted by size, M differences among the sorted K differences are selected, and an average value of the selected M differences is calculated; in step S402, calculating a difference delta between a difference between a reference magnetic field coefficient and a current magnetic field coefficient of a specific permanent magnet direct-drive generator set and the average value; in step S403, it is determined whether the specific permanent magnet direct-drive generator set has a magnetic steel fault according to the ratio of δ to the reference magnetic field coefficient of the specific permanent magnet direct-drive generator set. As an example, whether the magnetic steel fault exists in the specific permanent magnet direct-drive generator set is determined according to whether the ratio is greater than or equal to a threshold value, wherein the threshold value is preset, for example, when the ratio is greater than or equal to the threshold value, the magnetic steel fault exists in the specific permanent magnet direct-drive generator set is determined.
Furthermore, according to an exemplary embodiment of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed, implements the steps of the method according to an exemplary embodiment of the present invention.
It will be appreciated by those skilled in the art that the permanent magnet direct drive generator set described in the above method may also be other types of generator sets.
A method for early warning of a magnetic steel fault of a permanent magnet direct drive generator set according to an exemplary embodiment of the present invention has been described above with reference to fig. 1 to 4. Hereinafter, an apparatus for early warning of a magnetic steel failure of a permanent magnet direct-drive generator set according to an exemplary embodiment of the present invention will be described with reference to fig. 5.
Fig. 5 is a block diagram illustrating an apparatus 50 for permanent magnet direct drive generator set magnet steel fault pre-warning in accordance with an embodiment of the present disclosure.
Referring to fig. 5, the apparatus 50 for permanent magnet direct drive generator set magnetic steel fault pre-warning includes a data acquisition unit 51 and a processor 52, and as an example, the apparatus for permanent magnet direct drive generator set magnetic steel fault pre-warning may additionally include other elements.
As an example, at least one set of historical data of the voltage, current and rotational speed of each of the K permanent magnet direct drive generator sets may be acquired by the data acquisition unit 51, where K is greater than or equal to 1.
As an example, a sensor for measuring the voltage, current, rotation speed, etc. of the permanent magnet direct-drive generator set in real time may be installed for each permanent magnet direct-drive generator set to monitor the operation state of the permanent magnet direct-drive generator set, and the measured historical data of the voltage, current, rotation speed, etc. of the permanent magnet direct-drive generator set and the current data may be stored in the memory, and thus, at least one set of the historical data of the voltage, current, rotation speed, etc. of each of the K permanent magnet direct-drive generator sets may be acquired from the memory through the data acquisition unit 51 for subsequent use, where K is not less than 1. For example, the current, voltage, and rotation speed data of the permanent magnet direct-drive generator set may be acquired in five days of the time window, that is, the current, voltage, and rotation speed data of the permanent magnet direct-drive generator set in the previous five days may be acquired as history data by the data acquisition unit 51 for subsequent use.
As an example, referring again to fig. 2, the historical data of the voltage, the current, and the rotation speed in the linear region may be acquired by the data acquisition unit 51 for subsequent use, that is, at least one set of the historical data of the voltage, the current, and the rotation speed of each permanent magnet direct-drive generator set, which are respectively in a linear relationship, may be acquired by the data acquisition unit 51 from the stored historical data of the voltage, the current, and the rotation speed of each permanent magnet direct-drive generator set for subsequent use.
As an example, at least one set of history data of the voltage, the current, and the rotational speed, the rotational speed of which satisfies the rotational speed of 9 to 11 rotations/second, of each permanent magnet direct-drive generator set, may be acquired by the data acquisition unit 51 for subsequent use.
As an example, processor 52 may calculate a reference magnetic field coefficient for each permanent magnet direct drive generator set from at least one set of historical data obtained for the voltage, current, and rotational speed of each permanent magnet direct drive generator set.
Specifically, since the voltage, current and rotation speed of the permanent magnet direct-drive generator set are related to the magnetic flux of the magnetic steel, a parameter indicating the magnitude of the magnetic flux generated by the magnetic steel can be defined by the obtained voltage, current and rotation speed, for example, the processor 52 can calculate the reference magnetic field coefficient of each permanent magnet direct-drive generator set by at least one set of obtained historical data of the voltage, current and rotation speed of each permanent magnet direct-drive generator set to indicate the magnitude of the magnetic flux generated by the magnetic steel of each permanent magnet direct-drive generator set when the magnetic steel of each permanent magnet direct-drive generator set has no fault, that is, the calculated reference magnetic field coefficient of each permanent magnet direct-drive generator set indicates the magnitude of the magnetic flux generated by the magnetic steel when each permanent magnet direct-drive generator set has no fault.
As an example, the reference magnetic field coefficient for each permanent magnet direct drive generator set may be calculated by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient of the kth permanent magnet direct-drive generator set in the K permanent magnet direct-drive generator sets, N k The number of groups representing at least one group of historical data of voltage, current and rotating speed of the kth permanent magnet direct-drive generator set in the K permanent magnet direct-drive generator sets, R sk Represents the internal resistance of the kth permanent magnet direct-drive generator set, u nk 、i nk 、ω nk And respectively representing the voltage, the current and the rotating speed in the nth set of historical data in at least one set of historical data of the voltage, the current and the rotating speed of the kth permanent magnet direct drive generator set in the K permanent magnet direct drive generator sets.
As an example, processor 52 may calculate a current magnetic field coefficient for each permanent magnet direct drive generator set using the acquired set of current data for the voltage, current, and rotational speed of each permanent magnet direct drive generator set.
As an example, the reference magnetic field coefficient for each permanent magnet direct drive generator set may be defined by the following formula:
wherein, psi is cur_k Representing the current magnetic field coefficient, R of the kth permanent magnet direct-drive generator set sk Represents the internal resistance of the kth permanent magnet direct-drive generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotating speed of the permanent magnet direct-drive generator set of a group of current data of the kth permanent magnet direct-drive generator set are respectively represented.
As an example, processor 52 may calculate K differences in the reference magnetic field coefficients and the current magnetic field coefficients of the K permanent magnet direct drive generator sets.
Specifically, the difference between the reference magnetic field coefficient and the current magnetic field coefficient of each permanent magnet direct-drive generator set is calculated through the previous calculation.
As an example, the processor 52 may determine whether a magnetic steel fault exists in a specific permanent magnet direct drive generator set according to K difference values and a reference magnetic field coefficient of the specific permanent magnet direct drive generator set of the K permanent magnet direct drive generator sets.
As an example, when k=1, that is, when there is only one permanent magnet direct-drive generator set, the ratio of the difference between the current magnetic field coefficient and the reference magnetic field coefficient of the permanent magnet direct-drive generator set to the reference magnetic field coefficient of the permanent magnet direct-drive generator set may be calculated by the processor 52, and whether the specific permanent magnet direct-drive generator set has a magnetic steel fault may be determined according to whether the ratio is greater than or equal to a threshold value, where the threshold value is preset. For example, when the ratio is determined to be greater than or equal to a threshold value, the permanent magnet direct-drive generator set is judged to have a magnetic steel fault, and when the ratio is determined to be less than the threshold value, the permanent magnet direct-drive generator set is judged to have no magnetic steel fault.
When k=1 is described above, it is determined whether the magnetic steel of the permanent magnet direct-drive generator set has a fault by calculating the relative variation of the magnetic field coefficient of the single permanent magnet direct-drive generator set, but because the magnetic field coefficient detection is affected, there are environmental factors such as temperature and humidity, the influence of the environmental factors can be removed by the magnetic field coefficient of the permanent magnet direct-drive generator set in the same environment, and as an example, modern wind power plants are often composed of several to hundreds of wind power generator sets of the same type, and the influence of the environmental factors of a single wind field on the magnetic flux coefficient of each permanent magnet direct-drive generator set is the same, so that the interference can be removed by the change trend of the magnetic field coefficient of the whole field. The following describes a method for more precisely judging whether or not there is a fault in the magnetic steel by removing the trend of the change in the magnetic field coefficient of the whole field.
For example, when K+.gtoreq.2, processor 52 may determine whether a magnetic steel fault exists for a particular one of the K permanent magnet direct drive gensets by: calculating the average value of K differences, and calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific permanent magnet direct-drive generator set and the average value; and judging whether the magnetic steel fault exists in the specific permanent magnet direct-drive generator set according to the ratio of delta to the reference magnetic field coefficient of the specific permanent magnet direct-drive generator set, wherein the threshold value is preset, for example, when the ratio is greater than or equal to the threshold value, judging whether the magnetic steel fault exists in the specific permanent magnet direct-drive generator set.
For example, when K+.gtoreq.2, processor 52 may determine whether a magnetic steel fault exists for a particular one of the K permanent magnet direct drive gensets by: calculating the average value of M differences in the K differences, wherein M is smaller than K, sorting the K differences according to the size, selecting M differences in the middle of the K differences after sorting, calculating the average value of the M differences, calculating the difference delta between the reference magnetic field coefficient and the current magnetic field coefficient of a specific permanent magnet direct-drive generator set and the average value, and judging whether the specific permanent magnet direct-drive generator set has magnetic steel faults according to the ratio of delta to the reference magnetic field coefficient of the specific permanent magnet direct-drive generator set. As an example, whether the magnetic steel fault exists in the specific permanent magnet direct-drive generator set is determined according to whether the ratio is greater than or equal to a threshold value, wherein the threshold value is preset, for example, when the ratio is greater than or equal to the threshold value, the magnetic steel fault exists in the specific permanent magnet direct-drive generator set is determined.
It will be appreciated by those skilled in the art that the permanent magnet direct drive generator set described above may also be other types of generator sets.
Although the present disclosure includes specific examples, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the claims and their equivalents. The examples disclosed herein are to be considered in descriptive sense only and not for purposes of limitation. The description of features or aspects in each example will be considered to be applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order and/or if the described systems, structures, devices, or circuits are combined in a different manner and/or replaced or supplemented by other components or equivalents thereof. Therefore, the scope of the disclosure is defined not by the detailed description but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents are to be regarded as included in the disclosure.
Claims (23)
1. A method for pre-warning of a generator set of magnetic steel faults, the method comprising:
acquiring at least one set of historical data of voltage, current and rotating speed of each of the K generator sets, wherein K is more than or equal to 1;
calculating a reference magnetic field coefficient of each generator set through at least one set of historical data of the obtained voltage, current and rotating speed of each generator set;
calculating the current magnetic field coefficient of each generator set by using the obtained current data of the voltage, current and rotating speed of each generator set;
calculating K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K generator sets;
judging whether the magnetic steel fault exists in the specific generator set according to the K difference values and the reference magnetic field coefficient of the specific generator set in the K generator sets,
the reference magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel when the magnetic steel of each generator set has no fault, and the current magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel of each generator set.
2. The method of claim 1, wherein when K = 1, the step of determining whether a magnetic steel fault exists for a particular genset comprises:
calculating the ratio of the difference value between the current magnetic field coefficient and the reference magnetic field coefficient of the specific generator set to the reference magnetic field coefficient of the specific generator set; and
and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
3. The method of claim 1, wherein the step of obtaining at least one set of historical data for the voltage, current, and rotational speed of each of the K gensets comprises: and selecting at least one set of historical data of the voltage, the current and the rotating speed of each generator set, wherein the voltage and the current of each generator set are respectively in linear relation with the rotating speed.
4. The method of claim 1, wherein when K is greater than or equal to 2, the step of determining whether a magnetic steel fault exists for a particular one of the K generator sets comprises:
calculating the average value of the K differences;
calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and
judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
5. The method of claim 4, wherein determining whether a magnetic steel fault exists for a particular generator set based on the ratio comprises: and when the ratio is larger than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is smaller than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
6. The method of claim 1, wherein when K is greater than or equal to 2, the step of determining whether a magnetic steel fault exists for a particular one of the K generator sets comprises:
calculating an average value of M differences in the K differences, wherein M is less than K;
calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and
judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
7. The method of claim 6, wherein the step of calculating an average of M of the K differences comprises: and sorting the K differences according to the size, selecting M differences among the sorted K differences, and calculating the average value of the selected M differences.
8. The method of claim 6, wherein determining whether a magnetic steel fault exists for a particular genset based on the ratio comprises: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
9. The method of any of claims 1, 3-8, wherein the K gensets are in the same environment and are the same type of genset.
10. The method of any of claims 1-8, calculating a reference magnetic field coefficient for each genset by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient, N, of the kth of the K generator sets k A number of sets of at least one set of historical data representing voltage, current and rotational speed of a kth one of the K sets of generators, R sk Represents the internal resistance of the kth generator set, u nk 、i nk 、ω nk Respectively representing at least one of the voltage, current and rotational speed of the kth generator set of the K generator setsVoltage, current, and rotational speed in the nth set of historical data in the set of historical data.
11. The method of any of claims 1-8, wherein the current magnetic field coefficient for each of the K gensets is calculated by the following equation:
wherein, psi is cur_k Representing the current magnetic field coefficient of the kth generator set, R sk Represents the internal resistance of the kth generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotational speed of the generator set, respectively, representing a set of current data for the kth generator set.
12. A device for pre-warning of a generator set of magnetic steel faults, the device comprising:
the data acquisition unit is configured to acquire at least one set of historical data of voltage, current and rotating speed of each of the K generator sets, wherein K is more than or equal to 1;
a processor configured to perform the operations of:
calculating a reference magnetic field coefficient of each generator set through at least one set of historical data of the voltage, the current and the rotating speed of each generator set acquired by the data acquisition unit;
calculating the current magnetic field coefficient of each generator set by using the obtained current data of the voltage, current and rotating speed of each generator set;
calculating K differences between the reference magnetic field coefficients and the current magnetic field coefficients of the K generator sets;
judging whether the magnetic steel fault exists in the specific generator set according to the K difference values and the reference magnetic field coefficient of the specific generator set in the K generator sets,
the reference magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel when the magnetic steel of each generator set has no fault, and the current magnetic field coefficient of each generator set indicates the magnitude of magnetic flux generated by the magnetic steel of each generator set.
13. The apparatus of claim 12, wherein when k=1, the step of determining whether a magnetic steel fault exists for a particular genset comprises:
calculating the ratio of the difference value of the current magnetic field coefficient and the reference magnetic field coefficient of the specific generator set to the reference magnetic field coefficient of the specific generator set; and
and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
14. The apparatus of claim 12, wherein the step of obtaining at least one set of historical data for voltage, current, and rotational speed for each of the K gensets comprises: and selecting at least one set of historical data of the voltage, the current and the rotating speed of each generator set, wherein the voltage and the current of each generator set are respectively in linear relation with the rotating speed.
15. The apparatus of claim 12, wherein when K is greater than or equal to 2, determining whether a magnetic steel fault exists for a particular one of the K generator sets comprises:
calculating the average value of the K differences;
calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and
judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
16. The apparatus of claim 15, wherein determining whether a magnetic steel fault exists for a particular generator set based on the ratio comprises: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
17. The apparatus of claim 12, wherein when K is greater than or equal to 2, determining whether a magnetic steel fault exists for a particular one of the K generator sets comprises:
calculating an average value of M differences in the K differences, wherein M is less than K;
calculating the difference delta between the difference between the reference magnetic field coefficient and the current magnetic field coefficient of a specific generator set and the average value; and
judging whether the magnetic steel fault exists in the specific generator set according to the ratio of delta to the reference magnetic field coefficient of the specific generator set.
18. The apparatus of claim 17, wherein the step of calculating an average of M of the K differences comprises: and sorting the K differences according to the size, selecting M differences among the sorted K differences, and calculating the average value of the selected M differences.
19. The apparatus of claim 17, wherein determining whether a magnetic steel fault exists for a particular generator set based on the ratio comprises: and when the ratio is greater than or equal to a threshold value, determining that the magnetic steel fault exists in the specific generator set, and when the ratio is less than the threshold value, determining that the magnetic steel fault does not exist in the specific generator set, wherein the threshold value is preset.
20. The apparatus of any of claims 12, 14-19, wherein the K gensets are in the same environment and are the same type of genset.
21. The apparatus of any of claims 12-19, wherein the reference magnetic field coefficient for each genset is calculated by the following equation:
wherein, psi is ref_k Representing the reference magnetic field coefficient, N, of the kth of the K generator sets k A number of sets of at least one set of historical data representing voltage, current and rotational speed of a kth one of the K sets of generators, R sk Represents the internal resistance of the kth generator set, u nk 、i nk 、ω nk The voltage, current and rotational speed in the nth set of historical data in the at least one set of historical data representing the voltage, current and rotational speed, respectively, of the kth of the K gensets.
22. The apparatus of any of claims 12-19, wherein the current magnetic field coefficient for each of the K gensets is calculated by the following equation:
wherein, psi is cur_k Representing the current magnetic field coefficient of the kth generator set, R sk Represents the internal resistance of the kth generator set, u cur_k 、i cur_k 、ω cur_k The voltage, current and rotational speed of the generator set, respectively, representing a set of current data for the kth generator set.
23. A computer readable storage medium, wherein a computer program is stored thereon, which program, when executed, implements the steps of the method of any of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533621.0A CN111323700B (en) | 2018-12-14 | 2018-12-14 | Method and device for early warning of magnetic steel faults of generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533621.0A CN111323700B (en) | 2018-12-14 | 2018-12-14 | Method and device for early warning of magnetic steel faults of generator set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111323700A CN111323700A (en) | 2020-06-23 |
| CN111323700B true CN111323700B (en) | 2023-12-22 |
Family
ID=71168435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811533621.0A Active CN111323700B (en) | 2018-12-14 | 2018-12-14 | Method and device for early warning of magnetic steel faults of generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111323700B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000324755A (en) * | 1999-04-28 | 2000-11-24 | Matsushita Electric Ind Co Ltd | Rotary device, and processor equipped therewith |
| CN102589891A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Method for estimating endurance life of vehicle motor driving system |
| CN103269188A (en) * | 2013-06-04 | 2013-08-28 | 南车成都机车车辆有限公司 | Method for judging relationship between rotating speed deviation and current distribution of locomotive traction motor group |
| CN105329258A (en) * | 2015-11-20 | 2016-02-17 | 重庆微标科技股份有限公司 | Signal acquisition circuit, signal acquisition device and signal acquisition system applicable to magnetic steel online fault diagnosis |
| CN106401881A (en) * | 2015-07-27 | 2017-02-15 | 西门子公司 | Method to detect or monitor the demagnetization of a magnet |
| CN206209076U (en) * | 2016-11-30 | 2017-05-31 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of turbine generation apparatus test device |
| CN108680860A (en) * | 2018-07-23 | 2018-10-19 | 五邑大学 | A kind of EPS motor fault detection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10910923B2 (en) * | 2016-02-25 | 2021-02-02 | Mitsubishi Power, Ltd. | Rotating electric machine and defect detection method for rotating electric machine |
-
2018
- 2018-12-14 CN CN201811533621.0A patent/CN111323700B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000324755A (en) * | 1999-04-28 | 2000-11-24 | Matsushita Electric Ind Co Ltd | Rotary device, and processor equipped therewith |
| CN102589891A (en) * | 2012-03-02 | 2012-07-18 | 北京理工大学 | Method for estimating endurance life of vehicle motor driving system |
| CN103269188A (en) * | 2013-06-04 | 2013-08-28 | 南车成都机车车辆有限公司 | Method for judging relationship between rotating speed deviation and current distribution of locomotive traction motor group |
| CN106401881A (en) * | 2015-07-27 | 2017-02-15 | 西门子公司 | Method to detect or monitor the demagnetization of a magnet |
| CN105329258A (en) * | 2015-11-20 | 2016-02-17 | 重庆微标科技股份有限公司 | Signal acquisition circuit, signal acquisition device and signal acquisition system applicable to magnetic steel online fault diagnosis |
| CN206209076U (en) * | 2016-11-30 | 2017-05-31 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of turbine generation apparatus test device |
| CN108680860A (en) * | 2018-07-23 | 2018-10-19 | 五邑大学 | A kind of EPS motor fault detection method |
Non-Patent Citations (2)
| Title |
|---|
| 永磁同步电动机失磁故障电磁参数分析;张志艳 等;微特电机(第08期);第36-39页 * |
| 超超高效自启动永磁同步电动机转子磁钢装配及故障分析;蒋志玲;;科技创新与应用(第14期);第95页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111323700A (en) | 2020-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7042229B2 (en) | System and method for on line monitoring of insulation condition for DC machines | |
| EP2665925B1 (en) | A method for diagnostic monitoring of a wind turbine generator system | |
| EP2469703B1 (en) | System and method for synchronous machine health monitoring | |
| CN111758036B (en) | System and method for monitoring an operating state of an operating electrical device | |
| CN106304846B (en) | Method and system for determining fault status of synchronous machine | |
| US9255969B2 (en) | Prognostics and life estimation of electrical machines | |
| US20120001580A1 (en) | System and method for detecting fault in an ac machine | |
| US20110025371A1 (en) | Method for detecting a fault in an induction machine | |
| CN105572585A (en) | System and method of electric motor fault detection | |
| CN110546881B (en) | Segmented estimation of negative sequence voltage for fault detection in electrical systems | |
| EP1930738A2 (en) | Method for detecting an electrical short condition in a dynamoelectric machine | |
| GB2534406A (en) | Fault detection and diagnosis | |
| US20050218906A1 (en) | System and method for monitoring of insulation condition | |
| EP2363699A1 (en) | Vibration monitoring of a magnetic element in an electrical machine | |
| WO2020208743A1 (en) | Abnormality diagnosis device for electric motor equipment, abnormality diagnosis method for electric motor equipment, and abnormality diagnosis system for electric motor equipment | |
| CN113228442A (en) | Method for determining the location of a short-circuit fault in a generator arrangement, wind turbine, computer program and electrically readable medium | |
| CN110297183B (en) | Method and device for diagnosing turn-to-turn short circuit fault of rotor of synchronous phase modulator and storage medium | |
| JP2004135393A (en) | Alternator failure determining device for vehicle | |
| CN111323700B (en) | Method and device for early warning of magnetic steel faults of generator set | |
| US20130214714A1 (en) | Method and device for controlling a synchronous machine | |
| US20180175762A1 (en) | Regulator, and vehicle alternator and rotating speed detection method thereof | |
| US11346885B2 (en) | Winding interlayer short-circuit detection apparatus and winding interlayer short-circuit detection method | |
| Puzakov | Diagnosing of automotive alternators on thermal state | |
| Reznikov et al. | Development of A Mathematical Model of A Synchronous Generator for Monitoring Changes in Electrical and Mechanical Parameters of the Generator | |
| US9503008B2 (en) | System and method for monitoring a rapid de-excitation system for synchronous machines |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |