CN117554803A - Wide-frequency-domain measurement method and device under electric braking working condition in excitation system - Google Patents
Wide-frequency-domain measurement method and device under electric braking working condition in excitation system Download PDFInfo
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Abstract
The disclosure relates to the technical field of electric power system measurement, in particular to a wide-frequency-domain measurement method and device under an electric braking working condition in an excitation system. The wide-frequency-domain measuring method under the electric braking working condition in the excitation system comprises the following steps: in the process of wide frequency domain measurement, acquiring the number of zero crossing points obtained by sampling in a time length threshold; and according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the time length threshold is adjusted. The accuracy of stator current sampling can be improved by adopting the method.
Description
Technical Field
The disclosure relates to the technical field of computers, and in particular relates to a wide-frequency-domain measurement method and device under an electric braking working condition in an excitation system.
Background
In an excitation system, in order to improve the utilization rate of a unit and shorten the standby time of the shutdown of a large-sized hydraulic generator, a flexible electric braking mode is widely adopted in the shutdown process of the large-sized hydraulic generator. The frequency of the unit is not constant power frequency and is in a fluctuation trend in the flexible electric braking process. At this time, the stator current of the generator still adopts a traditional measuring method, which leads to inaccurate stator current sampling, and thus, the working condition of the generator cannot be accurately monitored.
Disclosure of Invention
The disclosure provides a wide-frequency-domain measurement method and device under an electric braking working condition in an excitation system, so as to at least solve the technical problem of inaccurate stator current sampling in the related art. The technical scheme of the present disclosure is as follows:
according to a first aspect of an embodiment of the present disclosure, there is provided a wide frequency domain measurement method under an electric braking condition in an excitation system, including:
in the process of wide frequency domain measurement, acquiring the number of zero crossing points obtained by sampling in a time length threshold;
and according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the duration threshold is adjusted.
Optionally, the adjusting the number of sampling points between any two adjacent zero crossing points in the duration threshold according to the number of zero crossing points includes:
if the number of the zero crossing points is equal to a number threshold, setting the number of sampling points between any two adjacent zero crossing points in the duration threshold as a first number threshold;
if the number of the zero crossing points is smaller than the number threshold, setting the sampling points as a second point threshold, wherein the second point threshold is determined by a first scale factor;
and if the number of the zero crossing points is larger than the number threshold, setting the sampling points as a third point threshold, wherein the third point threshold is determined by a second proportionality coefficient.
Optionally, before the setting the number of sampling points between any two adjacent zero crossing points within the duration threshold as the first point number threshold, the method further includes:
acquiring a first total sampling period number in the duration threshold;
and determining the first point number threshold according to the number threshold and the first total sampling period number.
Optionally, before the setting the sampling point number to the second point number threshold value, the method further includes:
determining a first ratio between the number threshold and the zero crossing number, and determining a first ratio coefficient according to the first ratio;
determining a second total sampling period number in the duration threshold according to the first ratio and the first ratio coefficient;
and determining the second point threshold according to the quantity threshold and the second total sampling period times.
Optionally, before the setting the sampling point number to the third point number threshold value, the method further includes:
determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio;
determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient;
and determining the third point number threshold according to the quantity threshold and the third total sampling period number.
According to a second aspect of the embodiments of the present disclosure, there is provided a wide frequency domain measuring device under an electric braking condition in an excitation system, including:
the zero crossing detection unit is used for acquiring the number of zero crossing points obtained by sampling in the duration threshold in the process of performing wide-frequency domain measurement;
and the sampling adjustment unit is used for adjusting the sampling point number between any two adjacent zero crossing points in the duration threshold according to the zero crossing point number.
Optionally, the sampling adjustment unit is configured to, when adjusting the number of sampling points between any two adjacent zero crossings in the duration threshold according to the number of zero crossings, specifically:
if the number of the zero crossing points is equal to a number threshold, setting the number of sampling points between any two adjacent zero crossing points in the duration threshold as a first number threshold;
if the number of the zero crossing points is smaller than the number threshold, setting the sampling points as a second point threshold, wherein the second point threshold is determined by a first scale factor;
and if the number of the zero crossing points is larger than the number threshold, setting the sampling points as a third point threshold, wherein the third point threshold is determined by a second proportionality coefficient.
Optionally, before the setting the number of sampling points between any two adjacent zero crossing points within the duration threshold to be the first point threshold, the sampling adjustment unit is further configured to:
acquiring a first total sampling period number in the duration threshold;
and determining the first point number threshold according to the number threshold and the first total sampling period number.
Optionally, before the setting the sampling point number to the second point number threshold, the sampling adjustment unit is further configured to:
determining a first ratio between the number threshold and the zero crossing number, and determining a first ratio coefficient according to the first ratio;
determining a second total sampling period number in the duration threshold according to the first ratio and the first ratio coefficient;
and determining the second point threshold according to the quantity threshold and the second total sampling period times.
Optionally, before the setting the sampling point number to the third point number threshold, the sampling adjustment unit is further configured to:
determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio;
determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient;
and determining the third point number threshold according to the quantity threshold and the third total sampling period number.
According to a third aspect of embodiments of the present disclosure, there is provided an electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to execute the instructions to implement a wide-band measurement method under electric braking conditions in the excitation system according to any one of the preceding aspects.
According to a fourth aspect of the present application, there is provided a storage medium, which when executed by a processor of an electronic device, enables the electronic device to perform the method of wide frequency domain measurement under electric braking conditions in an excitation system according to any one of the preceding aspects.
According to a fifth aspect of the present application, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the method of any one of the preceding aspects.
In summary, in the method provided by the embodiment of the present disclosure, the number of zero crossing points obtained by sampling in the duration threshold is obtained in the process of performing wide frequency domain measurement; and according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the time length threshold is adjusted. Therefore, the sampling point number is adjusted according to the zero crossing point number, the condition that stator current sampling is inaccurate due to frequency sending change of a unit can be reduced, and the accuracy of monitoring the working condition of the generator can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure and do not constitute an undue limitation on the disclosure.
Fig. 1 is a schematic flow chart of a wide frequency domain measurement method under an electric braking condition in an excitation system according to an embodiment of the disclosure;
FIG. 2 is a schematic flow chart of a method for measuring a wide frequency domain under an electric braking condition in another excitation system according to an embodiment of the disclosure;
FIG. 3 illustrates a schematic waveform of a current provided by an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a wide-frequency-domain measurement device under an electric braking condition in an excitation system according to an embodiment of the present disclosure;
fig. 5 is a block diagram of an electronic device, according to an example embodiment.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
In the related art, during a flexible electric braking process, a conventional measurement method, that is, sampling for a fixed period of time, is adopted for a stator current of a generator. For example, in the case of a unit frequency of 50Hz power frequency during flexible electric braking, sampling is performed with 0.2s as a fixed time period.
However, in the actual working process, the frequency is not constant and is in a fluctuation trend due to various external factors. For example, the frequency of the unit may be reduced from 50Hz to 45Hz, or increased from 50Hz to 55Hz. In this case, continuing to use conventional measurement methods will result in inaccurate stator current sampling.
The present disclosure is described in detail below with reference to specific examples.
In a first embodiment, as shown in fig. 1, fig. 1 shows a schematic flow chart of a method for measuring a wide frequency domain under an electric braking condition in an excitation system according to an embodiment of the disclosure, where the method may be implemented by a computer program and may be executed on a device for performing the method for measuring the wide frequency domain under the electric braking condition in the excitation system. The method is performed by an electronic device.
Specifically, the wide-frequency-domain measurement method under the electric braking working condition in the excitation system comprises the following steps:
s101, acquiring the number of zero crossing points obtained by sampling in a time duration threshold in the process of carrying out wide-frequency domain measurement;
according to some embodiments, the wide frequency domain measurement refers to a wide frequency domain measurement under electric braking conditions in the excitation system. In particular to a wide frequency domain measurement for generator stator current.
In some embodiments, the duration threshold is not specific to a fixed threshold. The time length threshold value can be adjusted according to the actual application scene.
According to some embodiments, zero-crossing refers to a current zero-crossing. For alternating current, on a time-current coordinate, the current starts from zero with the current, rises to a positive peak value according to the track of a sine wave, then falls to zero, then continues to fall to a negative peak value, then rises to zero, and continues to the next cycle. The moment when this current sine wave reaches zero is the current zero crossing.
It is easy to understand that the electronic device can obtain the number of zero crossing points obtained by sampling in the duration threshold in the process of performing wide-frequency domain measurement.
S102, according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the time length threshold is adjusted.
According to some embodiments, the number of sampling points refers to the number of sampling points at which current is sampled between any two adjacent zero crossings within the time duration threshold.
It is easy to understand that when the electronic device obtains the zero crossing number obtained by sampling in the duration threshold, the electronic device can adjust the sampling point number between any two adjacent zero crossing points in the duration threshold according to the zero crossing number.
In summary, in the method provided by the embodiment of the present disclosure, the number of zero crossing points obtained by sampling in the duration threshold is obtained in the process of performing wide frequency domain measurement; and according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the time length threshold is adjusted. Therefore, the sampling point number is adjusted according to the zero crossing point number, the condition that stator current sampling is inaccurate due to frequency sending change of a unit can be reduced, and the accuracy of monitoring the working condition of the generator can be improved.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a wide frequency domain measurement method under an electric braking condition in an excitation system according to an embodiment of the disclosure. The method is performed by an electronic device.
Specifically, the wide-frequency-domain measurement method under the electric braking working condition in the excitation system comprises the following steps:
s201, acquiring the number of zero crossing points obtained by sampling in a time duration threshold in the process of carrying out wide-frequency domain measurement;
fig. 3 illustrates a schematic waveform of a current provided by embodiments of the present disclosure, according to some embodiments. As shown in fig. 3, k1, k2, k3 are current zero-crossing points.
In some embodiments, the duration threshold may be adjusted according to the actual application scenario. The duration threshold may be, for example, 10s. The time period threshold may be, for example, 30s.
S202, if the number of zero crossing points is equal to a number threshold, acquiring a first total sampling period number in a duration threshold;
according to some embodiments, the number threshold x refers to the number of zero crossings that can be acquired within the duration threshold, assuming that the frequency of the motor is fixed. The number threshold is not specific to a certain fixed threshold. The number threshold x can be adjusted according to the actual application scenario. For example, when the frequency of the unit is kept constant at 50Hz power frequency, the sampling period may be 0.2s, the number of zero crossings in one sampling period may be 16, and in this case, when the time length threshold is 10s, the number threshold may be 800.
In some embodiments, the first total number of sampling periods n refers to the number of sampling periods employed when the threshold number of zero crossings is acquired. The first total number of sampling periods does not particularly refer to a certain fixed threshold. The first total sampling period number can be adjusted according to the actual application scene. The first total number of sampling periods n may be, for example, a positive integer.
S203, determining a first point number threshold according to the number threshold and the first total sampling period number, and setting the sampling point number between any two adjacent zero crossing points in the duration threshold as the first point number threshold;
according to some embodiments, the first point number threshold may be determined specifically according to the following equation:
wherein W is 1 Is a first point threshold. i1 =1, 2..n. X is X i1 The number of zero crossings acquired at the i1 st sampling period is indicated.
S204, if the number of zero crossings is smaller than the number threshold, determining a first ratio between the number threshold and the number of zero crossings, and determining a first ratio coefficient according to the first ratio;
according to some embodiments, the first ratio between the number threshold x and the zero crossing number y is x/y.
S205, determining a second total sampling period number in a duration threshold according to the first ratio and the first ratio coefficient;
according to some embodiments, the second total number of sampling periods z1 may be the product of the first ratio and the first ratio coefficient, i.e. z1=k1 (x/y).
In some embodiments, the value of the first scaling factor K1 increases with increasing x/y value, as long as it can be ensured that the number of sampling periods of the current actual frequency within the duration threshold is the same as the number of sampling periods of the set frequency within the duration threshold.
S206, determining a second point threshold according to the number threshold and the second total sampling period times, and setting the sampling point as the second point threshold;
according to some embodiments, the second point threshold may be determined specifically according to the following equation:
wherein W is 2 Is a second point threshold. i2 =1, 2..z 1.X is X i2 Representing the number of zero crossings acquired at the i2 th sampling period.
S207, if the number of zero crossings is larger than the number threshold, determining a second ratio between the number of zero crossings and the number threshold, and determining a second proportionality coefficient according to the second ratio;
according to some embodiments, the second ratio between the zero crossing number y and the number threshold x is y/x.
In some embodiments, the value of the second scaling factor K2 increases as the value of the second ratio y/x increases. As long as the sampling period times of the current actual frequency in the time length threshold value can be ensured to be the same as the sampling period times of the set frequency in the time length threshold value.
S208, determining a third total sampling period number in a duration threshold according to the second ratio and the second proportionality coefficient;
according to some embodiments, the third total number of sampling periods z2 may be the product of the second ratio and the second scaling factor, i.e. z2=k2 (y/x).
S209, determining a third point threshold according to the number threshold and the third total sampling period number, and setting the sampling point as the third point threshold.
According to some embodiments, the third point threshold may be determined specifically according to the following equation:
wherein W is 3 Is a third point threshold. i3 =1,2....z2。X i3 Representing the number of zero crossings acquired at the i3 rd sampling period.
In summary, according to the method provided by the embodiment of the present disclosure, first, in a process of performing wide frequency domain measurement, the number of zero crossing points obtained by sampling in a duration threshold is obtained. Then, if the number of zero crossing points is equal to the number threshold, acquiring a first total sampling period number in a duration threshold; determining a first point number threshold according to the number threshold and the first total sampling period number, and setting the sampling point number between any two adjacent zero crossing points in the duration threshold as the first point number threshold; therefore, the accuracy of the first point number threshold determination can be improved, and the accuracy of the sampling point number adjustment can be improved. Secondly, if the number of zero crossings is smaller than the number threshold, determining a first ratio between the number threshold and the number of zero crossings, and determining a first ratio coefficient according to the first ratio; determining a second total sampling period number in a duration threshold according to the first ratio and the first ratio coefficient; determining a second point threshold according to the number threshold and the second total sampling period times, and setting the sampling point as the second point threshold; therefore, the accuracy of the second point threshold determination can be improved, and the accuracy of the sampling point adjustment can be improved. In addition, if the zero crossing number is greater than the number threshold, determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio; determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient; determining a third point threshold according to the number threshold and the third total sampling period times, and setting the sampling point as the third point threshold; therefore, the accuracy of the second point threshold determination can be improved, and the accuracy of the sampling point adjustment can be improved. In general, through adjusting the sampling point number according to the zero crossing point number, the condition that stator current sampling is inaccurate due to frequency sending change of a unit can be reduced, and the accuracy of monitoring the working condition of the generator can be improved.
The following are device embodiments of the present disclosure that may be used to perform method embodiments of the present disclosure. For details not disclosed in the embodiments of the apparatus of the present disclosure, please refer to the embodiments of the method of the present disclosure.
Referring to fig. 4, a schematic structural diagram of a wide frequency domain measuring device under an electric braking condition in an excitation system according to an exemplary embodiment of the present disclosure is shown. The wide-frequency-domain measuring device in the excitation system under the electric braking working condition can be realized into all or part of the device through software, hardware or the combination of the software and the hardware. The wide frequency domain measuring device 400 under the electric braking working condition in the excitation system comprises a zero crossing point detecting unit 401 and a sampling adjusting unit 402, wherein:
the zero crossing point detection unit 401 is configured to obtain the number of zero crossing points obtained by sampling in the duration threshold in the process of performing wide frequency domain measurement;
the sampling adjustment unit 402 is configured to adjust the number of sampling points between any two adjacent zero crossing points in the time length threshold according to the number of zero crossing points.
Optionally, the sampling adjustment unit 402 is configured to, when adjusting the number of sampling points between any two adjacent zero crossings in the time length threshold according to the number of zero crossings, specifically:
if the number of zero crossing points is equal to the number threshold, setting the number of sampling points between any two adjacent zero crossing points in the duration threshold as a first number threshold;
if the zero crossing number is smaller than the number threshold, setting the sampling point number as a second point number threshold, wherein the second point number threshold is determined by the first scale factor;
and if the zero crossing number is greater than the number threshold, setting the sampling point number as a third point number threshold, wherein the third point number threshold is determined by the second proportionality coefficient.
Optionally, before the number of sampling points between any two adjacent zero crossings within the set duration threshold is the first threshold, the sampling adjustment unit 402 is further configured to:
acquiring a first total sampling period number in a duration threshold;
a first point count threshold is determined based on the count threshold and the first total number of sampling periods.
Optionally, before setting the sampling point to the second point threshold, the sampling adjustment unit 402 is further configured to:
determining a first ratio between the number threshold and the number of zero crossings, and determining a first ratio coefficient according to the first ratio;
determining a second total sampling period number in a duration threshold according to the first ratio and the first ratio coefficient;
and determining a second point threshold according to the quantity threshold and the second total sampling period times.
Optionally, before setting the sampling point to the third point threshold, the sampling adjustment unit 402 is further configured to:
determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio;
determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient;
and determining a third point threshold according to the quantity threshold and the third total sampling period times.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
In summary, in the device provided by the embodiment of the present disclosure, in the process of performing wide frequency domain measurement by using the zero crossing point detection unit, the number of zero crossing points obtained by sampling in the duration threshold is obtained; and the sampling adjustment unit adjusts the sampling point number between any two adjacent zero crossing points in the time length threshold according to the zero crossing point number. Therefore, the sampling point number is adjusted according to the zero crossing point number, the condition that stator current sampling is inaccurate due to frequency sending change of a unit can be reduced, and the accuracy of monitoring the working condition of the generator can be improved.
According to embodiments of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium and a computer program product.
Fig. 5 illustrates a schematic block diagram of an example electronic device 700 that may be used to implement embodiments of the present disclosure. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
As shown in fig. 5, the electronic device 500 includes a computing unit 501 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) 502 or a computer program loaded from a storage unit 508 into a Random Access Memory (RAM) 503. In the RAM 503, various programs and data required for the operation of the electronic device 500 may also be stored. The computing unit 501, ROM 502, and RAM 503 are connected to each other by a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.
A number of components in electronic device 500 are connected to I/O interface 505, including: an input unit 506 such as a keyboard, a mouse, etc.; an output unit 507 such as various types of displays, speakers, and the like; a storage unit 508 such as a magnetic disk, an optical disk, or the like; and a communication unit 509 such as a network card, modem, wireless communication transceiver, etc. The communication unit 509 allows the electronic device 500 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The computing unit 501 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 501 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 501 performs the various methods and processes described above, such as a wide frequency domain measurement method under electric braking conditions in an excitation system. For example, in some embodiments, the wide frequency domain measurement method for electric braking conditions in an excitation system may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as storage unit 508. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 500 via the ROM 502 and/or the communication unit 509. When the computer program is loaded into RAM 503 and executed by the computing unit 501, one or more steps of the wide frequency domain measurement method under electric braking conditions in the excitation system described above may be performed. Alternatively, in other embodiments, the computing unit 501 may be configured to perform the wide-frequency-domain measurement method under electric braking conditions in the excitation system in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), the internet, and blockchain networks.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service ("Virtual Private Server" or simply "VPS") are overcome. The server may also be a server of a distributed system or a server that incorporates a blockchain.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel or sequentially or in a different order, provided that the desired results of the technical solutions of the present disclosure are achieved, and are not limited herein.
The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (10)
1. A wide-frequency-domain measurement method under an electric braking working condition in an excitation system is characterized by comprising the following steps:
in the process of wide frequency domain measurement, acquiring the number of zero crossing points obtained by sampling in a time length threshold;
and according to the zero crossing number, the sampling point number between any two adjacent zero crossing points in the duration threshold is adjusted.
2. The method according to claim 1, wherein said adjusting the number of sampling points between any two adjacent zero crossings within the duration threshold according to the number of zero crossings comprises:
if the number of the zero crossing points is equal to a number threshold, setting the number of sampling points between any two adjacent zero crossing points in the duration threshold as a first number threshold;
if the number of the zero crossing points is smaller than the number threshold, setting the sampling points as a second point threshold, wherein the second point threshold is determined by a first scale factor;
and if the number of the zero crossing points is larger than the number threshold, setting the sampling points as a third point threshold, wherein the third point threshold is determined by a second proportionality coefficient.
3. The method of claim 2, further comprising, prior to said setting the number of samples between any adjacent two zero crossings within the duration threshold to a first number of points threshold:
acquiring a first total sampling period number in the duration threshold;
and determining the first point number threshold according to the number threshold and the first total sampling period number.
4. The method of claim 2, further comprising, prior to said setting the sampling point number to a second point number threshold:
determining a first ratio between the number threshold and the zero crossing number, and determining a first ratio coefficient according to the first ratio;
determining a second total sampling period number in the duration threshold according to the first ratio and the first ratio coefficient;
and determining the second point threshold according to the quantity threshold and the second total sampling period times.
5. The method of claim 2, further comprising, prior to said setting the sample point to a third point threshold:
determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio;
determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient;
and determining the third point number threshold according to the quantity threshold and the third total sampling period number.
6. The utility model provides a wide frequency domain measuring device under electric braking operating mode in excitation system which characterized in that includes:
the zero crossing detection unit is used for acquiring the number of zero crossing points obtained by sampling in the duration threshold in the process of performing wide-frequency domain measurement;
and the sampling adjustment unit is used for adjusting the sampling point number between any two adjacent zero crossing points in the duration threshold according to the zero crossing point number.
7. The apparatus of claim 6, wherein the sampling adjustment unit is configured to, when adjusting the number of sampling points between any two adjacent zero crossings within the duration threshold according to the number of zero crossings, specifically:
if the number of the zero crossing points is equal to a number threshold, setting the number of sampling points between any two adjacent zero crossing points in the duration threshold as a first number threshold;
if the number of the zero crossing points is smaller than the number threshold, setting the sampling points as a second point threshold, wherein the second point threshold is determined by a first scale factor;
and if the number of the zero crossing points is larger than the number threshold, setting the sampling points as a third point threshold, wherein the third point threshold is determined by a second proportionality coefficient.
8. The apparatus of claim 7, wherein the sample adjustment unit is configured to, prior to the setting the number of samples between any two adjacent zero crossings within the duration threshold to a first point threshold, further configured to:
acquiring a first total sampling period number in the duration threshold;
and determining the first point number threshold according to the number threshold and the first total sampling period number.
9. The apparatus of claim 7, wherein the sample adjustment unit is configured to, prior to the setting the sample point to a second point threshold, further configured to:
determining a first ratio between the number threshold and the zero crossing number, and determining a first ratio coefficient according to the first ratio;
determining a second total sampling period number in the duration threshold according to the first ratio and the first ratio coefficient;
and determining the second point threshold according to the quantity threshold and the second total sampling period times.
10. The apparatus of claim 7, wherein the sample adjustment unit is configured to, prior to the setting the sample point to a third point threshold, further configured to:
determining a second ratio between the zero crossing number and the number threshold, and determining a second scaling factor according to the second ratio;
determining a third total sampling period number in the duration threshold according to the second ratio and the second proportionality coefficient;
and determining the third point number threshold according to the quantity threshold and the third total sampling period number.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311312881.6A CN117554803A (en) | 2023-10-11 | 2023-10-11 | Wide-frequency-domain measurement method and device under electric braking working condition in excitation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311312881.6A CN117554803A (en) | 2023-10-11 | 2023-10-11 | Wide-frequency-domain measurement method and device under electric braking working condition in excitation system |
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