CN108169544B - Voltage sag display method and device - Google Patents
Voltage sag display method and device Download PDFInfo
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- CN108169544B CN108169544B CN201711430255.1A CN201711430255A CN108169544B CN 108169544 B CN108169544 B CN 108169544B CN 201711430255 A CN201711430255 A CN 201711430255A CN 108169544 B CN108169544 B CN 108169544B
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- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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Abstract
The embodiment of the invention provides a voltage sag display method and device, and belongs to the technical field of voltage sag processing. The method comprises the following steps: when voltage sag occurs in the monitored voltage sensitive equipment, obtaining a voltage sag root-mean-square waveform of the voltage sensitive equipment; converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function; and correspondingly overlapping and displaying the voltage sag energy function curve and the reference energy function curve in the same coordinate system. The method for intuitively and accurately displaying the voltage sag influence by adopting the preset voltage sag energy function can be widely applied to various voltage sensitive devices, so that the method for evaluating and displaying the voltage sag can be widely applied.
Description
Technical Field
The invention belongs to the technical field of voltage sag processing, and particularly relates to a voltage sag display method and device.
Background
With the continuous improvement of industrial technology, various automatic devices, microcomputer systems and variable frequency speed control systems are applied to production in large quantity.
These devices, while providing significant productivity gains, are referred to as voltage sensitive devices because the requirements for the quality of the electrical power required for operation, e.g., voltage sag, become more stringent. Due to the difficulty in controllability of the voltage sag, the voltage sag has become one of the main problems affecting the normal operation of these voltage sensitive devices, and brings great economic loss to enterprises. Therefore, it is important to evaluate the voltage sag.
At present, the method for evaluating the voltage sag can adopt a measurement statistical method, a fuzzy evaluation method, a probability estimation method and the like. Although these methods can accurately calculate and evaluate the voltage sag of the corresponding type of voltage-sensitive device, they can generate a large error if they do not calculate and evaluate the voltage sag of the corresponding type of voltage-sensitive device. Therefore, the limitation of the type of voltage sensitive device makes the current method for evaluating the voltage sag difficult to be widely applied.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for displaying voltage sag, which effectively improve the above-mentioned drawbacks.
The embodiment of the invention is realized by the following modes:
in a first aspect, an embodiment of the present invention provides a voltage sag display method, which is applied to a detection terminal. The method comprises the following steps: when voltage dip is generated by monitored voltage sensitive equipment, obtaining voltage dip root-mean-square waveform of the voltage sensitive equipment; converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function; and correspondingly overlapping and displaying the voltage sag energy function curve and the reference energy function curve in the same coordinate system.
With reference to the technical solution provided by the first aspect, in some possible implementation manners, the obtaining a voltage sag root-mean-square waveform of the voltage sensitive device includes: obtaining a voltage sag waveform generated by the voltage sensitive device in the state of voltage sag; and calculating the voltage sag waveform to obtain the corresponding voltage sag root mean square waveform based on a preset sliding window root mean square value calculation method.
With reference to the technical solution provided by the first aspect, in some possible implementation manners, the preset voltage sag energy function is:
wherein, UsagThe ratio of effective value to standard value of voltage sag, a/b/c are respectively represented as each item in three phases, M is the sampling number in T time, and delta TjAnd E is voltage sag energy obtained by three-phase accumulation, and the sampling time interval between every two adjacent sampling points in the M sampling points is shown.
In some possible implementation manners, the abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is a sampling point corresponding to each time within the t time, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point.
With reference to the technical solution provided by the first aspect, in some possible implementation manners, after the voltage sag energy function curve and the reference energy function curve are correspondingly displayed in an overlapping manner in the same coordinate system. The method further comprises the following steps: obtaining target sampling points determined by a user in the M sampling points of the coordinate system; and obtaining a first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve, obtaining a second voltage sag energy corresponding to the target sampling point in the reference energy function curve, and obtaining a difference value between the first voltage sag energy and the second voltage sag energy.
In a second aspect, an embodiment of the present invention provides a voltage sag display device, which is applied to a detection terminal. The device comprises: the device comprises a first obtaining module, a second obtaining module and a third obtaining module, wherein the first obtaining module is used for obtaining the voltage dip root-mean-square waveform of the voltage sensitive device when the voltage sensitive device to be monitored generates voltage dip. The conversion module is used for converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function and converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function. And the display module is used for correspondingly displaying the voltage sag energy function curve and the reference energy function curve in an overlapping manner in the same coordinate system.
With reference to the technical solution provided by the second aspect, in some possible implementations, the first obtaining module includes: an obtaining unit, configured to obtain a voltage sag waveform generated by the voltage sensitive device in a state of voltage sag. And the computing unit is used for computing the voltage sag waveform to obtain the corresponding voltage sag root-mean-square waveform based on a preset sliding window root-mean-square value computing method.
With reference to the technical solution provided by the second aspect, in some possible implementations, the preset voltage sag energy function in the apparatus is:
wherein, UsagThe ratio of effective value to standard value of voltage sag, a/b/c are respectively represented as each item in three phases, M is the sampling number in T time, and delta TjAnd E is voltage sag energy obtained by three-phase accumulation, and the sampling time interval between every two adjacent sampling points in the M sampling points is shown.
With reference to the technical solution provided by the second aspect, in some possible implementations, in the apparatus: the abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is one sampling point corresponding to each moment in the time t, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point.
With reference to the technical solution provided by the second aspect, in some possible implementations, the apparatus further includes: and the second obtaining module is used for obtaining the target sampling points determined by the user in the M sampling points of the coordinate system. And the third obtaining module is used for obtaining a first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve, obtaining a second voltage sag energy corresponding to the target sampling point in the reference energy function curve, and obtaining a difference value between the first voltage sag energy and the second voltage sag energy.
The embodiment of the invention has the beneficial effects that:
when the voltage sag occurs to the monitored voltage sensitive equipment, the detection terminal firstly obtains the voltage sag root-mean-square waveform of the voltage sensitive equipment. The detection terminal can convert the obtained voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and also convert a preset voltage tolerance curve of the voltage sensitive device into a reference energy function curve based on the preset voltage sag energy function. Therefore, the voltage sag energy function curve and the reference energy function curve are correspondingly and overlappingly displayed in the same coordinate system, so that a user can intuitively and accurately know whether the voltage sag of the voltage sensitive equipment affects the voltage sag energy function curve and the reference energy function curve. Because the preset voltage tolerance curve of the voltage sensitive equipment can be used as an accurate comparison reference through the calculation of the preset voltage sag energy function, and the preset voltage tolerance curve has universality in various voltage sensitive equipment, the method for intuitively and accurately displaying the voltage sag influence by adopting the preset voltage sag energy function can be widely applied to various voltage sensitive equipment, and the method for evaluating and displaying the voltage sag can be widely applied.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a block diagram of a detection terminal according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a voltage sag display method according to a second embodiment of the present invention;
FIG. 3 is a first block diagram of a voltage sag display apparatus according to a third embodiment of the present invention;
fig. 4 is a block diagram illustrating a first obtaining module of a voltage sag displaying apparatus according to a third embodiment of the present invention;
fig. 5 is a second block diagram of a voltage sag display apparatus according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
First embodiment
Referring to fig. 1, a second embodiment of the invention provides a detection terminal 10. The detection terminal 10 includes: the voltage sag display device comprises a voltage sag display device, a memory 101, a storage controller 102, a processor 103, a peripheral interface 104, an input/output unit 105 and a display unit 106.
The memory 101, the memory controller 102, the processor 103, the peripheral interface 104, the input/output unit 105, and the display unit 106 are electrically connected to each other directly or indirectly to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The voltage sag display device comprises at least one software functional module which can be stored in the memory in the form of software or firmware (firmware) or solidified in the Windows operating system of the job data management server 13. The processor 103 is used to execute executable modules stored in the memory 101, such as software functional modules or computer programs included in the voltage sag display device.
The Memory 101 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 101 is configured to store a program, and the processor 103 executes the program after receiving the execution instruction, and the method executed by the job data management server 13 defined by the process disclosed in any embodiment of the present invention may be applied to the processor 103, or implemented by the processor 103.
The processor 103 may be an integrated circuit chip having signal processing capabilities. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. The general purpose processor 103 may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 104 couples various input and output units 105 to the processor 103 and to the memory 101. In some embodiments, the peripheral interface, the processor, and the memory controller may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The input and output unit 105 is used for providing input data for a user to realize the interaction of the user with the detection terminal 10. The input/output unit may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 106 provides an interactive interface between the test terminal 10 and a user, such as a user interface, or for displaying image data to a user reference. In this embodiment, the display unit may be a liquid crystal display or a touch display. In the case of a touch display, the display can be a capacitive touch screen or a resistive touch screen, which supports single-point and multi-point touch operations. The support of single-point and multi-point touch operations means that the touch display can sense touch operations simultaneously generated from one or more positions on the touch display, and the sensed touch operations are sent to the processor for calculation and processing.
Second embodiment
Referring to fig. 2, a second embodiment of the present invention provides a voltage sag displaying method applied to a detection terminal, the voltage sag displaying method including: step S100, step S200, and step S300.
Step S100: when a voltage sag is generated by a monitored voltage sensitive device, a voltage sag root mean square waveform of the voltage sensitive device is obtained.
The detection terminal is electrically connected with the detection port of the monitored voltage sensitive equipment, so that the detection terminal can detect voltage sag of the monitored voltage sensitive equipment. The monitored voltage sensitive equipment can be automatic control equipment, equipment of a microcomputer system, equipment of a variable frequency speed control system and the like.
When the voltage sag occurs in the monitored voltage sensitive device, for example, when the supply voltage of the monitored voltage sensitive device shakes to generate the voltage sag, the detection terminal can obtain the voltage sag waveform generated by the voltage sensitive device in the voltage sag state in real time through the electrical connection with the detection port of the voltage sensitive device, that is, the detection terminal samples the voltage sag waveform at a certain sampling frequency in a time period in which the voltage sag occurs.
In this embodiment, in order to perform further processing based on the voltage sag waveform, for example, in order to obtain energy corresponding to the voltage sag waveform, the detection terminal needs to perform further conversion on the voltage sag waveform.
As one method, a sliding window square root value calculation method is preset and stored in the detection terminal. Based on the voltage sag waveform acquired in real time, the detection terminal calculates the voltage sag waveform by adopting a preset sliding window square mean root value calculation method, so that the corresponding voltage sag root mean square waveform can be obtained, and the energy corresponding to the voltage sag waveform can be obtained through the voltage sag root mean square waveform.
Step S200: and converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function.
In this embodiment, the manner of obtaining the energy corresponding to the voltage sag waveform through the voltage sag root-mean-square waveform may be to calculate the voltage sag root-mean-square waveform by using a voltage sag energy function. Therefore, the detection terminal can preset and store a voltage sag energy function so as to facilitate subsequent calculation.
As one way, the preset voltage sag energy function may be:
wherein, UsagThe ratio of effective value to standard value of voltage sag, a/b/c are respectively represented as each item in three phases, M is the sampling number in T time, and delta TjAnd E is voltage sag energy obtained by three-phase accumulation, and the sampling time interval between every two adjacent sampling points in the M sampling points is shown.
Furthermore, the voltage phase is three-phase, the detection terminal can substitute the data of each phase in the voltage sag root-mean-square waveform into the preset voltage sag energy function, calculate the data of each phase based on the preset voltage sag energy function and sum the calculation result with the calculation results of the other two terms, so that the voltage sag root-mean-square waveform can be converted into a voltage sag energy function curve. The voltage sag energy function curve accurately reflects the real situation of voltage sag generated on the voltage sensitive equipment in an energy form by adopting the calculation of a preset voltage sag energy function. In addition, the voltage sag energy function curve reflecting the voltage sag can be obtained by simply analyzing the voltage sag root-mean-square waveform, so that the problems of complex operation of numerical processing on the voltage sag waveform and poor adaptability are solved.
It can be understood that, in order to reduce the operation load of the detection terminal and thus reduce the operation load of the detection terminal, the detection terminal does not perform the calculation of the preset voltage tolerance curve of the voltage sensitive device before detecting the voltage sag and calculating to obtain the voltage sag energy function curve.
In this embodiment, a preset voltage tolerance curve of the voltage sensitive device is pre-stored in the voltage sensitive device as data with universality of the voltage sensitive device, wherein the preset voltage tolerance curve can represent the conventional voltage withstanding capability of the voltage sensitive device. When the detection terminal obtains the voltage sag energy function curve, the detection terminal correspondingly calculates the preset voltage tolerance curve of the voltage sensitive device.
Specifically, the detection terminal first obtains a preset voltage tolerance curve of the voltage sensitive device from a storage area of the voltage sensitive device. The detection terminal substitutes data in the preset voltage tolerance curve into the preset voltage sag energy function, and the data in the preset voltage tolerance curve are calculated based on the preset voltage sag energy function, so that the preset voltage tolerance curve can be converted into a reference energy function curve. The reference energy function curve is used for accurately representing the voltage tolerance of the voltage sensitive device through the form of energy.
Step S300: and correspondingly overlapping and displaying the voltage sag energy function curve and the reference energy function curve in the same coordinate system.
After the detection terminal calculates and obtains the voltage sag energy function curve and the reference energy function curve, the detection terminal can establish a coordinate system according to a preset control program, wherein the abscissa of the coordinate system is time t, and the ordinate of the coordinate system is an energy value.
Furthermore, the detection terminal can map the temporary voltage drop energy function curve and the reference energy function curve to the same coordinate system according to the execution of a preset program, and display the temporary voltage drop energy function curve and the reference energy function curve in the same coordinate system through the display capability of the detection terminal. The abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is a sampling point corresponding to each moment in time t, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point.
Furthermore, a user observes the voltage sag energy function curve and the reference energy function curve displayed by the same coordinate system, and by taking the reference energy function curve as a reference standard, the user can conveniently, vividly and intuitively know whether the generated voltage sag exceeds the voltage withstanding level of the voltage sensitive equipment. For example, on the basis of the same abscissa, an ordinate value of the voltage sag energy function curve is greater than an ordinate value of the reference energy function curve, which indicates that the voltage sag at the time corresponding to the abscissa exceeds the withstand voltage level of the voltage sensitive device, and thus the performance life of the voltage sensitive device is easily adversely affected; otherwise, the performance life of the voltage sensitive equipment is not adversely affected.
It should be noted that a continuous voltage sag energy function curve is adopted to reflect the real situation of the voltage sag, and inaccuracy of characterization caused by excessive distortion of a waveform when the voltage sag is represented by a matrix wave is also avoided.
As an embodiment, after step S300, based on the user' S observation of the voltage sag energy function curve and the reference energy function curve displayed in the same coordinate system, the detection terminal may further obtain target sampling points determined by the user among M sampling points of the coordinate system based on the observation of the displayed image. And the detection terminal obtains the first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve from the voltage sag energy function curve through the target sampling point, namely, the ordinate value corresponding to the abscissa of the target sampling point in the voltage sag energy function curve is obtained. And through the target sampling point, second voltage sag energy corresponding to the target sampling point in the reference energy function curve is obtained from the reference energy function curve, namely the ordinate of the target sampling point corresponding to the ordinate of the reference energy function curve is obtained. Further, the detection terminal subtracts the second voltage sag energy from the first voltage sag energy, so as to obtain a difference value between the first voltage sag energy and the second voltage sag energy. If the difference is positive, the voltage sag is accurately represented within the withstand voltage range, otherwise, the voltage sag is accurately represented beyond the withstand voltage range.
Third embodiment
Referring to fig. 3, a third embodiment of the present invention provides a voltage sag display apparatus 100, where the voltage sag display apparatus 100 is applied to a detection terminal, and the voltage sag display apparatus 100 includes:
the first obtaining module 110 is configured to obtain a root mean square waveform of a voltage sag of a voltage sensitive device to be monitored when the voltage sensitive device generates the voltage sag.
The conversion module 120 is configured to convert the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and convert the preset voltage tolerance curve of the voltage sensitive device into a reference energy function curve based on the preset voltage sag energy function.
A display module 130, configured to correspondingly display the voltage sag energy function curve and the reference energy function curve in an overlapping manner in the same coordinate system.
Referring to fig. 4, in a voltage sag display apparatus 100 according to a third embodiment of the present invention, the first obtaining module 110 includes:
an obtaining unit 111, configured to obtain a voltage sag waveform generated by the voltage sensitive device in the voltage sag state.
The calculating unit 112 is configured to calculate the voltage sag waveform to obtain the corresponding voltage sag root-mean-square waveform based on a preset sliding window root-mean-square value calculating method.
Further, the preset voltage sag energy function in the voltage sag displaying device 100 is:
wherein, UsagThe ratio of the effective value to the standard value of the voltage sag, a/b/c are respectively and correspondingly characterized as delta TjAnd each of the three phases, M is the number of samples in t time, the sampling time interval between every two adjacent sampling points in the M sampling points, and E is the voltage sag energy obtained by three-phase accumulation.
Further, in the voltage sag display device 100: the abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is one sampling point corresponding to each moment in the time t, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point.
Referring to fig. 4, in a voltage sag display apparatus 100 according to a third embodiment of the present invention, the voltage sag display apparatus 100 further includes:
and a second obtaining module 140, configured to obtain a target sampling point determined by the user in the M sampling points of the coordinate system.
A third obtaining module 150, configured to obtain a first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve, obtain a second voltage sag energy corresponding to the target sampling point in the reference energy function curve, and obtain a difference between the first voltage sag energy and the second voltage sag energy.
It should be noted that, as those skilled in the art can clearly understand, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
In summary, the embodiments of the present invention provide a voltage sag display method and device, which are applied to a detection terminal. The method comprises the following steps: when voltage sag occurs in the monitored voltage sensitive equipment, obtaining a voltage sag root-mean-square waveform of the voltage sensitive equipment; converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function; and correspondingly overlapping and displaying the voltage sag energy function curve and the reference energy function curve in the same coordinate system.
When the voltage sag occurs to the monitored voltage sensitive equipment, the detection terminal firstly obtains the voltage sag root-mean-square waveform of the voltage sensitive equipment. The detection terminal can convert the obtained voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and also convert a preset voltage tolerance curve of the voltage sensitive device into a reference energy function curve based on the preset voltage sag energy function. Therefore, the voltage sag energy function curve and the reference energy function curve are correspondingly and overlappingly displayed in the same coordinate system, so that a user can intuitively and accurately know whether the voltage sag of the voltage sensitive equipment affects the voltage sag energy function curve and the reference energy function curve. Because the preset voltage tolerance curve of the voltage sensitive equipment can be used as an accurate comparison reference through the calculation of the preset voltage sag energy function, and the preset voltage tolerance curve has universality in various voltage sensitive equipment, the method for intuitively and accurately displaying the voltage sag influence by adopting the preset voltage sag energy function can be widely applied to various voltage sensitive equipment, and the method for evaluating and displaying the voltage sag can be widely applied.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A voltage sag display method is applied to a detection terminal, and the method comprises the following steps:
when voltage dip is generated by monitored voltage sensitive equipment, obtaining voltage dip root-mean-square waveform of the voltage sensitive equipment;
converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function, and synchronously converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function;
correspondingly overlapping and displaying the voltage sag energy function curve and the reference energy function curve in the same coordinate system, wherein the abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is a sampling point corresponding to each moment in time t, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point;
before detecting the voltage sag and calculating to obtain the voltage sag energy function curve, the detection terminal does not calculate the preset voltage tolerance curve of the voltage sensitive device.
2. The method according to claim 1, wherein the obtaining the voltage sag root-mean-square waveform of the voltage sensitive device comprises:
obtaining a voltage sag waveform generated by the voltage sensitive device in the state of voltage sag;
and calculating the voltage sag waveform to obtain the corresponding voltage sag root mean square waveform based on a preset sliding window root mean square value calculation method.
3. The method according to claim 2, wherein the predetermined voltage sag energy function is:
wherein, UsagThe ratio of the effective value to the standard value of the voltage sag, a/b/c are respectively and correspondingly characterized as delta TjAnd each of the three phases, M is the number of samples in t time, the sampling time interval between every two adjacent sampling points in the M sampling points, and E is the voltage sag energy obtained by three-phase accumulation.
4. The method according to any one of claims 1-3, wherein after the voltage sag energy function curve and the reference energy function curve are correspondingly and overlappingly displayed in the same coordinate system, the method further comprises:
obtaining target sampling points determined by a user in the M sampling points of the coordinate system;
and obtaining a first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve, obtaining a second voltage sag energy corresponding to the target sampling point in the reference energy function curve, and obtaining a difference value between the first voltage sag energy and the second voltage sag energy.
5. A voltage sag display device is applied to a detection terminal, and the device comprises:
the voltage monitoring device comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining a voltage dip root-mean-square waveform of a voltage sensitive device when the voltage sensitive device to be monitored generates a voltage dip;
the conversion module is used for converting the voltage sag root-mean-square waveform into a voltage sag energy function curve based on a preset voltage sag energy function and synchronously converting a preset voltage tolerance curve of the voltage sensitive equipment into a reference energy function curve based on the preset voltage sag energy function;
the showing module is used for correspondingly overlapping and showing the voltage sag energy function curve and the reference energy function curve in the same coordinate system, wherein the abscissa of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is a sampling point corresponding to each moment within t time, and the ordinate of the voltage sag energy function curve and the reference energy function curve in the same coordinate system is the voltage sag energy corresponding to each sampling point;
before detecting the voltage sag and calculating to obtain the voltage sag energy function curve, the detection terminal does not calculate the preset voltage tolerance curve of the voltage sensitive device.
6. The voltage sag display apparatus according to claim 5, wherein the first obtaining module comprises:
an obtaining unit, configured to obtain a voltage sag waveform generated by the voltage sensitive device in a state of voltage sag;
and the computing unit is used for computing the voltage sag waveform to obtain the corresponding voltage sag root-mean-square waveform based on a preset sliding window root-mean-square value computing method.
7. The voltage sag presentation device according to claim 6, wherein the preset voltage sag energy function in the device is:
wherein, UsagThe ratio of effective value to standard value of voltage sag, a/b/c are respectively represented as each item in three phases, M is the sampling number in T time, and delta TjAnd E is voltage sag energy obtained by three-phase accumulation, and the sampling time interval between every two adjacent sampling points in the M sampling points is shown.
8. The voltage sag display device according to any one of claims 5-7, wherein the device further comprises:
the second obtaining module is used for obtaining target sampling points determined by a user in the M sampling points of the coordinate system;
and the third obtaining module is used for obtaining a first voltage sag energy corresponding to the target sampling point in the voltage sag energy function curve, obtaining a second voltage sag energy corresponding to the target sampling point in the reference energy function curve, and obtaining a difference value between the first voltage sag energy and the second voltage sag energy.
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