CN116735942B - System and method for measuring low-frequency current on rotor side of variable-speed generator motor - Google Patents
System and method for measuring low-frequency current on rotor side of variable-speed generator motor Download PDFInfo
- Publication number
- CN116735942B CN116735942B CN202310994529.9A CN202310994529A CN116735942B CN 116735942 B CN116735942 B CN 116735942B CN 202310994529 A CN202310994529 A CN 202310994529A CN 116735942 B CN116735942 B CN 116735942B
- Authority
- CN
- China
- Prior art keywords
- current
- secondary side
- generator motor
- speed generator
- side current
- 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
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 230000009466 transformation Effects 0.000 claims abstract description 37
- 238000004590 computer program Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000004891 communication Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The application relates to a system and a method for measuring low-frequency current on the rotor side of a variable-speed generator motor. The method comprises the following steps: acquiring secondary side current information of a current transformer module; determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve; and carrying out Fourier transform on the secondary side current envelope curve to obtain primary side current information of the current transformer module. The method can be used for analyzing the secondary side current of the current transformer module based on the current transformer module by adopting a local peak detection method to obtain a secondary side current envelope curve, and transforming the secondary side current envelope curve by utilizing Fourier transformation so as to obtain accurate primary side current information, further determining the low-frequency current of the rotor side of the variable speed generator motor based on the primary side current information, and improving the accuracy of the measuring result of the low-frequency current of the rotor side of the variable speed generator motor.
Description
Technical Field
The present application relates to the field of generator motor technology, and in particular, to a system, a method, an apparatus, a computer device, a storage medium and a computer program product for measuring a rotor-side low frequency current of a variable speed generator motor.
Background
The rotor side working frequency of the variable speed generator motor is extremely low (between +/-5 Hz), the conventional electromagnetic current transformer is easy to saturate, large transmission errors exist, and accurate measurement is difficult.
In the prior art, the measuring method of the low-frequency current at the rotor side of the variable-speed generator motor mainly comprises a Hall measuring method and a photoelectric measuring method.
However, in the conventional technology, in the process of measuring the low-frequency current of the rotor side of the variable-speed generator motor by using a Hall measurement method or a photoelectric measurement method, the requirement on the operation environment is high, and when the electromagnetic condition of the working environment is bad, the measurement precision is greatly reduced, so that the accuracy of the measurement result of the low-frequency current of the rotor side of the variable-speed generator motor is not improved.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a system, a method, an apparatus, a computer device, a computer-readable storage medium, and a computer program product for measuring a variable speed generator motor rotor-side low frequency current that are capable of improving accuracy of measurement results of the variable speed generator motor rotor-side low frequency current.
In a first aspect, the present application provides a system for measuring low frequency current on the rotor side of a variable speed generator motor, the system comprising: a current transformer module and an auxiliary power supply; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship; the auxiliary power supply is connected in series between the secondary windings of the electromagnetic current transformers.
In one embodiment, the material of the iron core of the electromagnetic current transformer is a high magnetic permeability material.
In one embodiment, the transformation ratio of the electromagnetic current transformer is greater than a preset transformation ratio threshold.
In one embodiment, the effective voltage value of the auxiliary power supply is 230V, and the frequency of the auxiliary power supply is 50Hz.
In one embodiment, the application further provides a method for measuring the low-frequency current on the rotor side of the variable-speed generator motor, which is applied to the measuring system, and comprises the following steps:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In one embodiment, the local peak detection time window corresponding to the local peak detection method is smaller than or equal to a preset time window threshold.
In a second aspect, the present application also provides a measurement device for a variable speed generator motor rotor side low frequency current, the device comprising:
the acquisition module is used for acquiring secondary side current information of the current transformer module; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship;
the detection module is used for determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
the transformation module is used for carrying out Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
According to the measuring system, the measuring method, the measuring device, the computer equipment, the storage medium and the computer program product for the low-frequency current of the rotor side of the variable speed generator motor, the secondary side current of the current transformer module is determined by acquiring the secondary side current information of the current transformer module, the envelope curve of the secondary side current information is determined by adopting a local peak detection method, the secondary side current envelope curve is obtained, the secondary side current is analyzed by utilizing the local peak detection method, the obtained accurate secondary side current envelope curve is subjected to Fourier transformation, the primary side current information of the current transformer module is obtained, the low-frequency current of the rotor side of the variable speed generator motor is further determined by utilizing the primary side current information, the analysis of the secondary side current of the current transformer module is realized based on the current transformer module by adopting the local peak detection method, the secondary side current envelope curve is obtained, the secondary side current envelope curve is analyzed by utilizing the Fourier transformation, the accurate primary side current information is obtained, the low-frequency current of the rotor side of the variable speed generator motor is determined, and the accuracy of the measuring result of the low-frequency current of the rotor side of the variable speed generator motor is improved.
Drawings
FIG. 1 is an environmental diagram of an embodiment of a method for measuring low frequency current on the rotor side of a variable speed generator motor;
FIG. 2 is a schematic diagram of a system for measuring low frequency current on the rotor side of a variable speed generator motor according to one embodiment;
FIG. 3 is a flow chart of a method of measuring low frequency current on the rotor side of a variable speed generator motor according to one embodiment;
FIG. 4 is a schematic diagram of a secondary side current envelope curve in one embodiment;
FIG. 5 is a schematic diagram of an envelope curve half-cycle Fourier transform result according to one embodiment;
FIG. 6 is a block diagram of a device for measuring low frequency current on the rotor side of a variable speed generator motor according to one embodiment;
fig. 7 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The method for measuring the low-frequency current on the rotor side of the variable-speed generator motor, provided by the embodiment of the application, can be applied to an application environment shown in fig. 1. Wherein the measurement system 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server. The server 104 acquires secondary side current information of the current transformer module; the server 104 adopts a local peak detection method to determine an envelope curve of the secondary side current information, and a secondary side current envelope curve is obtained; the server 104 performs Fourier transform on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor. The server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
In some embodiments, as shown in fig. 2, a wiring schematic of a measurement system for variable speed generator motor rotor side low frequency current is provided, the system comprising: a current transformer module and an auxiliary power supply; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship; the auxiliary power supply is connected in series between the secondary windings of the electromagnetic current transformers.
The current transformer module can be a device for measuring low-frequency current at the rotor side of the variable-speed generator motor, and in practical application, the current transformer module can comprise two electromagnetic current transformers with the same specification; further, the current transformer module can be used as a novel current transformer.
The auxiliary power source may refer to a device for providing a stable power source to the current transformer module.
As an example, as shown in fig. 2, the measuring system for the low-frequency current on the rotor side of the variable-speed generator motor includes a current transformer module and an auxiliary power supply, the current transformer module may include two electromagnetic current transformers with the same specification, the secondary windings of the two electromagnetic current transformers are in an anti-series connection relationship, and the auxiliary power supply is connected in series with the secondary windings of the two electromagnetic current transformers.
In the present embodiment, accurate measurement of the low-frequency current on the rotor side of the variable speed generator motor can be achieved by using the measurement system for the low-frequency current on the rotor side of the variable speed generator motor.
In some embodiments, the material of the core of the electromagnetic current transformer is a high permeability material.
The high magnetic conductive material may include high magnetic conductive alloy, and in practical application, the iron cores of the two electromagnetic current transformers are made of the high magnetic conductive material.
In some embodiments, the transformation ratio of the electromagnetic current transformer is greater than a preset transformation ratio threshold.
The transformation ratio threshold value can be specifically set to be a fixed value, and in practical application, the transformation ratio threshold value can be flexibly adjusted and set based on actual parameters of various elements in the measurement system.
In this embodiment, the electromagnetic current transformer with the transformation ratio larger than the preset transformation ratio threshold value is adopted, so that the high impedance characteristic of the secondary winding coil can be satisfied.
In some embodiments, the voltage effective value of the auxiliary power supply is 230V, and the frequency of the auxiliary power supply is 50Hz.
The voltage effective value and the frequency of the auxiliary power supply can be flexibly adjusted and set based on the actual running environment and the measurement requirement of the measurement system.
In some embodiments, as shown in fig. 3, a method for measuring a low-frequency current on a rotor side of a variable speed generator motor applied to the above measurement system is provided, and this embodiment is exemplified by the method being applied to a server, it is understood that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and implemented through interaction of the terminal and the server, where the terminal may be, but is not limited to, various personal computers, notebook computers, smartphones, tablet computers, internet of things devices, and portable wearable devices. In this embodiment, the method includes the steps of:
step S302, secondary side current information of the current transformer module is obtained.
The secondary side current information may refer to data representing a change condition of a current of a secondary side of the current transformer module, and in practical application, the secondary side current information may include a secondary side current signal.
As an example, to measure the low-frequency current on the rotor side of the variable speed generator motor, the measuring system for the low-frequency current on the rotor side of the variable speed generator motor is adopted, the primary side of the measuring system is connected in series with a circuit to be measured, the variable speed generator motor can be included in the circuit to be measured, and the server takes the current magnitude and/or the current direction of the secondary side current of the current transformer module in the measuring system as the secondary side current information of the current transformer module.
And S304, determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve.
The local peak detection method may be a method of determining a current characteristic (such as a peak value) of the secondary side current.
Wherein the envelope curve may refer to a curve characterizing the signal amplitude variation of the high frequency signal.
The secondary-side current envelope curve may refer to a curve of a signal amplitude variation characteristic of the secondary-side current.
As an example, after the server obtains the secondary side current information of the current transformer module, the server performs local peak detection on the secondary side current signal of the current transformer module, and obtains a secondary side current envelope curve corresponding to the secondary side current information.
And step S306, carrying out Fourier transform on the secondary side current envelope curve to obtain primary side current information of the current transformer module.
The primary side current information may be used to measure a low frequency current of a rotor side of the variable speed generator motor, and the primary side current information may refer to data representing a change condition of a current of a primary side of the current transformer module.
The fourier transform may refer to a fourier transform algorithm (signal analysis method), and in practical application, the fourier transform may be used as a linear integral transform for transforming signals between a time domain (or a space domain) and a frequency domain.
As an example, the server performs fourier transform on the secondary side current envelope curve by using a half-cycle fourier algorithm (half-axis fourier algorithm), so as to obtain primary side current information of the current transformer module, where in practical application, when the above-mentioned measurement system for the low-frequency current of the rotor side of the variable speed generator motor is directly connected to the variable speed generator motor to be measured, the primary side current information may be used as the low-frequency current information of the rotor side of the variable speed generator motor; when other elements are further connected between the measuring system for the low-frequency current of the rotor side of the variable speed generator motor and the variable speed generator motor to be measured, the server may calculate the low-frequency current information of the rotor side of the variable speed generator motor according to the primary side current information based on the connection relation and the circuit characteristics between the measuring system, the other elements and the variable speed generator motor to be measured.
In the method for measuring the low-frequency current on the rotor side of the variable speed generator motor, the secondary side current of the current transformer module is determined by acquiring the secondary side current information of the current transformer module, the envelope curve of the secondary side current information is determined by adopting the local peak detection method, the secondary side current envelope curve is obtained, the secondary side current is analyzed by utilizing the local peak detection method, the obtained accurate secondary side current envelope curve is subjected to Fourier transformation, primary side current information of the current transformer module is obtained, the low-frequency current on the rotor side of the variable speed generator motor is determined by utilizing the primary side current information, analysis of the secondary side current of the current transformer module is realized based on the current transformer module, the secondary side current envelope curve is obtained by adopting the local peak detection method, the secondary side current envelope curve is analyzed by utilizing the Fourier transformation, accurate primary side current information is obtained, and the low-frequency current on the rotor side of the variable speed generator motor is determined based on the primary side current information, and the accuracy of the measuring result of the low-frequency current on the rotor side of the variable speed generator motor is improved.
In some embodiments, the local peak detection time window corresponding to the local peak detection method is less than or equal to a preset time window threshold.
The local peak detection time window may refer to a signal sampling time interval in the process of determining the secondary side current envelope curve by adopting a local peak detection method.
The time window threshold can be flexibly adjusted based on actual measurement requirements, and in actual application, the time window threshold can comprise 0.01s.
In this embodiment, the local peak detection time window corresponding to the local peak detection method is smaller than or equal to the preset time window threshold, so that the calculated amount and the calculated accuracy can be balanced for the secondary side current signal according to a reasonable sampling period, and the measuring accuracy and the measuring efficiency of the low-frequency current at the rotor side of the variable speed generator motor can be improved.
In some embodiments, a measurer selects two electromagnetic current transformers with the same specification, connects the secondary windings of the two electromagnetic current transformers in reverse series, connects an auxiliary power supply in series in the secondary windings to form a novel current transformer (current transformer module), obtains secondary side current of the novel current transformer by a server, obtains an envelope curve of the secondary side current by a local peak detection method, carries out Fourier transform on the envelope curve, and obtains a primary side current value by considering the transformation ratio of the electromagnetic current transformer to realize accurate measurement of the rotor side low-frequency current.
In this embodiment, through the current transformer module, based on the secondary side electric current of current transformer module, confirm the low-frequency current of rotor side, can carry out accurate measurement to variable speed generator motor rotor side low-frequency current, simultaneously, current transformer module simple structure, with low costs, operational characteristic is reliable, the practicality is strong.
In some embodiments, as shown in fig. 2, a wiring schematic of a measurement system for a rotor side low frequency current of a variable speed generator motor is provided, and a simulation model is built in PSCAD software; assuming that the peak value of the low-frequency current at the rotor side of the variable speed generator motor is 700A and the frequency is 1Hz, the server converts the transformation ratio of the secondary side current of the novel current transformer in the simulation result to obtain a measured current and an envelope curve, as shown in fig. 4, a schematic diagram of the secondary side current envelope curve is provided, the server performs half-cycle Fourier transformation on the envelope curve to obtain a transformation result, as shown in fig. 5, a schematic diagram of the half-cycle Fourier transformation result of the envelope curve is provided, the transformation result can represent the measured value of the low-frequency current at the rotor side of the variable speed generator motor, wherein the fundamental frequency peak value in the transformation result is 696.852A, the measured error of the measuring system is determined to be 0.45%, the error is small (within an error acceptable range), and the measuring accuracy requirement is met, so that the accuracy and the effectiveness of the measured result are verified when the low-frequency current at the rotor side of the variable speed generator motor is measured by adopting the measuring method aiming at the low-frequency current at the variable speed generator motor.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a measuring device for the low-frequency current of the rotor side of the variable speed generator motor, which is used for realizing the measuring method for the low-frequency current of the rotor side of the variable speed generator motor. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation in the embodiments of the device for measuring low-frequency current on the rotor side of the variable speed generator motor provided below can be referred to above for the limitation of the method for measuring low-frequency current on the rotor side of the variable speed generator motor, which is not repeated here.
In one embodiment, as shown in fig. 6, there is provided a measuring device for a low-frequency current on a rotor side of a variable speed generator motor, comprising: an acquisition module 602, a detection module 604, and a transformation module 606, wherein:
the acquisition module 602 is configured to acquire secondary side current information of the current transformer module; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship.
And the detection module 604 is configured to determine an envelope curve of the secondary side current information by using a local peak detection method, so as to obtain a secondary side current envelope curve.
The transformation module 606 is configured to perform fourier transformation on the secondary-side current envelope curve to obtain primary-side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In an exemplary embodiment, the apparatus further includes a time window module, where the time window module is specifically configured to set a local peak detection time window corresponding to the local peak detection method to be less than or equal to a preset time window threshold.
The respective modules in the above-described measuring device for the low-frequency current on the rotor side of the variable-speed generator motor may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method for measuring a rotor-side low frequency current of a variable speed generator motor. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 7 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In one embodiment, the processor further performs setting that a local peak detection time window corresponding to the local peak detection method is smaller than or equal to a preset time window threshold when executing the computer program.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In one embodiment, the computer program when executed by the processor further implements setting a local peak detection time window corresponding to the local peak detection method to be less than or equal to a preset time window threshold.
In one embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, performs the steps of:
acquiring secondary side current information of the current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
In one embodiment, the computer program when executed by the processor further implements setting a local peak detection time window corresponding to the local peak detection method to be less than or equal to a preset time window threshold.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as Static Random access memory (Static Random access memory AccessMemory, SRAM) or dynamic Random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (8)
1. A method for measuring a low-frequency current on a rotor side of a variable speed generator motor, which is applied to a system for measuring a low-frequency current on a rotor side of a variable speed generator motor, the method comprising:
acquiring secondary side current information of a current transformer module;
determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
performing Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used for measuring low-frequency current of the rotor side of the variable speed generator motor;
the measuring system for the low-frequency current of the rotor side of the variable-speed generator motor comprises a current transformer module and an auxiliary power supply; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship; the auxiliary power supply is connected in series between the secondary windings of the electromagnetic current transformers.
2. The method of claim 1, wherein the material of the core of the electromagnetic current transformer is a high permeability material.
3. The method of claim 1, wherein the electromagnetic current transformer has a transformation ratio greater than a preset transformation ratio threshold.
4. The method of claim 1, wherein the auxiliary power supply has a voltage effective value of 230V and the auxiliary power supply has a frequency of 50Hz.
5. The method of claim 1, wherein the local peak detection time window corresponding to the local peak detection method is less than or equal to a preset time window threshold.
6. A measurement device for a variable speed generator motor rotor side low frequency current, the device comprising:
the acquisition module is used for acquiring secondary side current information of the current transformer module; the current transformer module comprises two electromagnetic current transformers; the secondary windings of the electromagnetic current transformers are in an inverse series connection relationship;
the detection module is used for determining an envelope curve of the secondary side current information by adopting a local peak detection method to obtain a secondary side current envelope curve;
the transformation module is used for carrying out Fourier transformation on the secondary side current envelope curve to obtain primary side current information of the current transformer module; the primary side current information is used to measure the low frequency current on the rotor side of the variable speed generator motor.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310994529.9A CN116735942B (en) | 2023-08-09 | 2023-08-09 | System and method for measuring low-frequency current on rotor side of variable-speed generator motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310994529.9A CN116735942B (en) | 2023-08-09 | 2023-08-09 | System and method for measuring low-frequency current on rotor side of variable-speed generator motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116735942A CN116735942A (en) | 2023-09-12 |
| CN116735942B true CN116735942B (en) | 2023-11-03 |
Family
ID=87909875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310994529.9A Active CN116735942B (en) | 2023-08-09 | 2023-08-09 | System and method for measuring low-frequency current on rotor side of variable-speed generator motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116735942B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57142164A (en) * | 1981-02-26 | 1982-09-02 | Mitsubishi Electric Corp | Fault detector for secondary circuit in wound-rotor type induction motor |
| CN1064153A (en) * | 1991-02-15 | 1992-09-02 | 机电结合股份有限公司 | Current measuring device |
| JPH06313776A (en) * | 1993-04-30 | 1994-11-08 | Meidensha Corp | Detector of ground fault current of grounding line |
| JPH08278332A (en) * | 1995-04-05 | 1996-10-22 | Hitachi Cable Ltd | Method for calculation of current of power transmission line |
| JP2011257362A (en) * | 2010-06-11 | 2011-12-22 | Takada Corp | Abnormality diagnosis method of rotary machine system |
| KR101306109B1 (en) * | 2012-04-30 | 2013-09-09 | 현대로템 주식회사 | Current detecting circuit for railway car |
| CN103296904A (en) * | 2012-02-29 | 2013-09-11 | 黄煜梅 | Power-factor correction constant current controller and control method |
| CN103543323A (en) * | 2013-11-05 | 2014-01-29 | 云南省计量测试技术研究院 | Current detection device for large direct current charge-discharge facility |
| CN110988481A (en) * | 2019-11-26 | 2020-04-10 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN111412114A (en) * | 2019-12-26 | 2020-07-14 | 浙江运达风电股份有限公司 | Wind turbine generator impeller imbalance detection method based on stator current envelope spectrum |
| CN112198359A (en) * | 2020-09-10 | 2021-01-08 | 华北电力大学扬中智能电气研究中心 | Current sampling system and method of photovoltaic module |
| CN212622819U (en) * | 2020-07-09 | 2021-02-26 | 王维伟 | Test circuit and test equipment for alternating current impedance of wind driven generator rotor |
| DE102019217425A1 (en) * | 2019-11-12 | 2021-05-12 | Robert Bosch Gmbh | Electric machine |
| CN116184193A (en) * | 2023-02-22 | 2023-05-30 | 中国西安卫星测控中心 | Antenna servo driving state monitoring and fault diagnosis method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640565A (en) * | 2021-07-26 | 2021-11-12 | 台达电子企业管理（上海）有限公司 | Current detection circuit, current detection method and converter |
-
2023
- 2023-08-09 CN CN202310994529.9A patent/CN116735942B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57142164A (en) * | 1981-02-26 | 1982-09-02 | Mitsubishi Electric Corp | Fault detector for secondary circuit in wound-rotor type induction motor |
| CN1064153A (en) * | 1991-02-15 | 1992-09-02 | 机电结合股份有限公司 | Current measuring device |
| JPH06313776A (en) * | 1993-04-30 | 1994-11-08 | Meidensha Corp | Detector of ground fault current of grounding line |
| JPH08278332A (en) * | 1995-04-05 | 1996-10-22 | Hitachi Cable Ltd | Method for calculation of current of power transmission line |
| JP2011257362A (en) * | 2010-06-11 | 2011-12-22 | Takada Corp | Abnormality diagnosis method of rotary machine system |
| CN103296904A (en) * | 2012-02-29 | 2013-09-11 | 黄煜梅 | Power-factor correction constant current controller and control method |
| KR101306109B1 (en) * | 2012-04-30 | 2013-09-09 | 현대로템 주식회사 | Current detecting circuit for railway car |
| CN103543323A (en) * | 2013-11-05 | 2014-01-29 | 云南省计量测试技术研究院 | Current detection device for large direct current charge-discharge facility |
| DE102019217425A1 (en) * | 2019-11-12 | 2021-05-12 | Robert Bosch Gmbh | Electric machine |
| CN110988481A (en) * | 2019-11-26 | 2020-04-10 | 中广核核电运营有限公司 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
| CN111412114A (en) * | 2019-12-26 | 2020-07-14 | 浙江运达风电股份有限公司 | Wind turbine generator impeller imbalance detection method based on stator current envelope spectrum |
| CN212622819U (en) * | 2020-07-09 | 2021-02-26 | 王维伟 | Test circuit and test equipment for alternating current impedance of wind driven generator rotor |
| CN112198359A (en) * | 2020-09-10 | 2021-01-08 | 华北电力大学扬中智能电气研究中心 | Current sampling system and method of photovoltaic module |
| CN116184193A (en) * | 2023-02-22 | 2023-05-30 | 中国西安卫星测控中心 | Antenna servo driving state monitoring and fault diagnosis method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116735942A (en) | 2023-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Karimzadeh et al. | Method for determining utility and consumer harmonic contributions based on complex independent component analysis | |
| Yang et al. | Non‐linear characteristic quantity extraction of ferroresonance overvoltage time series | |
| CN110082612B (en) | Ultra/extra-high voltage converter station direct current field electric field simulation method and device and storage medium | |
| CN115659985B (en) | Electric power knowledge graph entity alignment method and device and computer equipment | |
| CN116720447B (en) | Mathematical analysis modeling method and device for rotor eccentric faults of variable speed generator motor | |
| CN114460376A (en) | Loop impedance detection method, loop impedance detection circuit, computer device and storage medium | |
| CN116735942B (en) | System and method for measuring low-frequency current on rotor side of variable-speed generator motor | |
| Beg et al. | Feed-forward artificial neural network–discrete wavelet transform approach to classify power system transients | |
| WO2023124592A1 (en) | Pt primary voltage reconstruction method based on inverse black box model and inverse electromagnetic duality model | |
| CN116879634A (en) | Method, apparatus, device, medium and program product for monitoring line resistance of ground electrode | |
| CN116007742A (en) | Transformer abnormal sound detection method, device, equipment and storage medium | |
| CN114441835A (en) | Double-conductor current measuring method and device based on magnetic field sensing chip | |
| CN117741515A (en) | Natural ester vegetable oil transformer performance judging method and device | |
| Guntaka et al. | Regression and kriging analysis for grid power factor estimation | |
| Fagan et al. | Optimized magnetic hysteresis management in numerical electromagnetic field simulations | |
| Faiz et al. | Time-stepping finite element analysis of distribution transformers performance under unbalanced voltage and load | |
| CN117148147B (en) | Motor performance parameter determining method based on DC attenuation method of any rotor position | |
| CN115015643B (en) | System side harmonic impedance detection method | |
| CN117289097A (en) | Power equipment partial discharge detection method, model training method, device and equipment | |
| CN117744320A (en) | Noise data processing method and device for transformer and computer equipment | |
| CN115267301B (en) | Voltage measuring method, voltage measuring device, computer equipment and storage medium | |
| Bisht et al. | A Wavelet descriptor model of hysteresis loop phenomena | |
| Yuan et al. | Field‐circuit coupling numerical calculation method of transformer remanence | |
| CN117723895B (en) | Distribution network fault section positioning method and device based on multi-terminal amplitude ratio matrix | |
| Peng et al. | Duality-based potential transformer model including black-box circuit for high-frequency transient simulation |
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 |