CN112415258A - Method and system for judging characteristic amplitude and duration of voltage transient event - Google Patents
Method and system for judging characteristic amplitude and duration of voltage transient event Download PDFInfo
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- CN112415258A CN112415258A CN202011225703.6A CN202011225703A CN112415258A CN 112415258 A CN112415258 A CN 112415258A CN 202011225703 A CN202011225703 A CN 202011225703A CN 112415258 A CN112415258 A CN 112415258A
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- 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
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- 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
- G01R19/02—Measuring effective values, i.e. root-mean-square values
Abstract
The disclosure provides a method and a system for distinguishing a characteristic amplitude and a duration of a voltage transient event, wherein the method comprises the following steps: comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs; determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event; comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended; performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time; the difference between the end time and the start time is the duration, and the feature amplitude is calculated from event occurrence to end. The technical scheme of the disclosure provides that the measurement error of the duration time does not exceed +/-1 ms, and further the voltage transient event is more accurately positioned.
Description
Technical Field
The disclosure belongs to the technical field of power equipment, and particularly relates to a method and a system for judging a characteristic amplitude and a duration of a voltage transient event.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the operation of an electric power system, frequently occurring transient disturbance is an electric energy quality dynamic problem which is more and more concerned by people. With the rapid development of high and new technologies such as computer application technology, automation control technology, high-power electronic technology and the like, high-performance and highly-automated novel electric equipment and various power electronic equipment based on the management, analysis, detection and control of a computer and a microprocessor are put into use in a power system in large quantity, are very sensitive to system interference and have more rigorous requirements on the power quality than the traditional electric equipment. Whether the system is in a normal steady state or a fault transient state, the usability of fundamental wave sinusoidal power with small amplitude deviation (such as only allowing fluctuation within a range of +/-10% or less of a rated value) and high dynamic constant characteristic are ensured, and even voltage surges, drops or interruptions of a few cycles can affect the normal operation of the equipment, so that huge economic losses are caused. Therefore, it is necessary to analyze various transient disturbance phenomena, determine the cause of the disturbance and take corresponding treatment measures.
In the analysis of transient events, the most interesting is its 2 main characteristic parameters: characteristic amplitude and duration. The characteristic amplitude is the magnitude of the voltage amplitude after the voltage transient event occurs. The duration is the difference between the starting and stopping moments of the voltage transient event. According to the latest national standard GBT 19862-2016 general requirements for power quality monitoring equipment, the voltage amplitude measurement error in the voltage transient event process should not exceed +/-0.2% of the nominal input voltage, and the duration measurement error should not exceed +/-20 ms. To control the influence caused by the voltage transient event as much as possible, 2 main characteristic parameters of the voltage transient event need to be measured in real time, the characteristic amplitude and the duration of the voltage transient event are accurately found, and then corresponding measures are taken to control according to conditions.
Disclosure of Invention
In order to overcome the defects of the prior art, the method for judging the characteristic amplitude and the duration of the voltage transient event is provided, so that the characteristic amplitude and the duration of the voltage transient event can be more accurately calculated, and the measurement error of the duration is controlled within the set requirement.
In order to achieve the above object, one or more embodiments of the present disclosure provide the following technical solutions:
in a first aspect, a method for discriminating a characteristic amplitude and a duration of a voltage transient event is disclosed, which includes:
comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs;
determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event;
comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended;
performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time;
the difference between the end time and the start time is the duration, and the feature amplitude is calculated from event occurrence to end.
According to the further technical scheme, when the characteristic amplitude is calculated, if the duration is longer than a set value, point-by-point refreshing is carried out on sampling points in the fault occurrence period to calculate the root mean square value, and the characteristic amplitude is obtained, otherwise, the characteristic amplitude is obtained from the half-wave refreshing root mean square value.
According to the further technical scheme, the half-wave position of the fault when the fault occurs is determined by comparing the half-wave refreshing root-mean-square value with the starting threshold of the transient event, and the method specifically comprises the following steps:
and calculating the root mean square value of the half-cycle refreshing voltage from the sampling points, recording and storing the root mean square value, wherein a measurement data window is a voltage root mean square measurement value of one cycle, updating every half cycle once, comparing the calculated half-wave refreshing root mean square value with a voltage sag starting threshold value, and recording the position of the half wave when the half-wave refreshing root mean square value is smaller than the voltage sag starting threshold value and the voltage sag starting threshold value starts.
In the further technical scheme, the root mean square is calculated by refreshing point by point, and the position of a sampling point when a fault occurs is determined.
According to the further technical scheme, the position of the sampling point when the fault occurs is determined, and the method specifically comprises the following steps:
after the half-wave position where the voltage sag occurs is determined, 1.5 cycles are pushed forward on the basis of the position to carry out point-by-point refreshing calculation of the root mean square value, the value is compared with the product of the voltage root mean square value which normally operates before the transient event occurs and the voltage sag starting threshold, when the point-by-point refreshing root mean square value is smaller than the product of the voltage and the voltage sag starting threshold, the position of the sampling point at the moment is recorded, and the fault starting time is determined.
According to the further technical scheme, the position of the sampling point at the end of the event is determined, and the method specifically comprises the following steps:
and comparing the half-wave refreshing root mean square value with a voltage transient event ending threshold, and ending the voltage sag event when the half-wave refreshing root mean square value is greater than the voltage sag ending threshold, thereby determining the half-wave position where the fault is ended.
In a further technical scheme, the characteristic amplitude and the duration are calculated by the specific method: after determining the half-wave position where the fault is ended, forward pushing 1.5 cycles to perform point-by-point refreshing root mean square value calculation on the basis of the position, comparing the value with the product of the voltage root mean square value which normally operates after the transient event is ended and a voltage sag ending threshold value, and recording the position of the sampling point at the moment when the point-by-point refreshing root mean square value is greater than the product of the voltage and the voltage sag starting threshold value, and determining the fault ending time; the end time of the fault minus the start time is the duration of this voltage sag.
In a second aspect, a system for discriminating characteristic amplitude and duration of a voltage transient event is disclosed, comprising:
a half-wave position determination module at which a fault occurs, configured to: comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs;
an event start time recording module configured to: determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event;
a half-wave position determination module at the end of the event configured to: comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended;
an event end time recording module configured to: performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time;
a duration and feature magnitude computation module configured to: and calculating the difference between the ending time and the starting time as the duration, and calculating the characteristic amplitude from the event occurrence to the end.
The above one or more technical solutions have the following beneficial effects:
the technical scheme disclosed by the invention can more accurately position the occurrence and the termination of the voltage transient event, provide field data for power quality supervision and treatment work, define a pollution source and pertinently provide treatment measures.
When the characteristic amplitude is calculated according to the technical scheme, if the duration is longer than a set value, the square root mean value of the sampling points in the fault occurrence period is refreshed point by point to obtain the characteristic amplitude, otherwise, the characteristic amplitude is obtained from the half-wave square root mean value, and the problem that the judgment of the traditional half-wave refreshing square root mean value is inaccurate on the voltage transient event of less than 30ms is solved.
The technical scheme of the disclosure provides that the measurement error of the duration time is not more than +/-1 ms and is lower than the standard requirement, (the standard requirement error is +/-20 ms), and further, the voltage transient event is more accurately positioned.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 illustrates a point-by-point refresh method for calculating a root mean square value according to an embodiment of the present disclosure;
FIG. 2 is a flowchart of a method for determining a characteristic amplitude and duration of a voltage transient event according to an embodiment of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
The general idea proposed by the present disclosure:
the invention provides a method for judging the characteristic amplitude and the duration of a voltage transient event, which comprises the steps of firstly utilizing a half-wave refreshing root mean square value to compare with a starting threshold of the transient event, finding out a half-wave position when the event occurs, carrying out point-by-point refreshing root mean square value calculation on the basis, comparing the point-by-point refreshing root mean square value with the product of a normal voltage root mean square value and a voltage sag starting threshold, determining the position of a sampling point of the event, and recording the event starting time. And comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event, finding out the half-wave position when the event ends, calculating the point-by-point refreshing root mean square value on the basis, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point of the event end, and recording the event ending time. The difference between the ending time and the starting time is the duration. And comparing the root mean square values of the half-wave refreshing in the period one by one from the occurrence of the event to the end of the event to find out the characteristic amplitude. When the duration is less than 1.5 cycles, the characteristic amplitude needs special treatment. Because the duration is too short, the judgment by adopting the half-wave refreshing root mean square value is likely to have deviation, so the half-wave refreshing root mean square value is adopted to be compared with the threshold value of the voltage sag, the point-by-point refreshing root mean square value calculation is carried out on the sampling points in the fault occurrence period, the point-by-point refreshing calculation root mean square values are compared one by one, and the characteristic amplitude is found out.
Example one
The embodiment discloses a method for judging the characteristic amplitude and the duration of a voltage transient event, and referring to a flow chart of the method for judging the characteristic amplitude and the duration of the voltage transient event in fig. 2, the method comprises the following steps:
step one, calculating a cycle square mean root value updated by a half cycle through a sampling point, comparing the cycle square mean root value with a starting threshold value of a transient event, and determining the position of a half-wave when a fault occurs.
And step two, adopting point-by-point refreshing to calculate the root mean square, and determining the sampling point when the fault occurs. Therefore, the position of the sampling point when the fault occurs can be accurately positioned, and the time of the sampling point is obtained, so that the starting time of the fault is more accurately obtained.
And step three, comparing the square root mean square value of the cycle wave refreshed by the half cycle wave with the ending threshold value of the transient event, and determining the half-wave position where the fault is ended.
And step four, calculating the characteristic amplitude and the duration.
And step five, when the duration is less than 1.5 cycles, the characteristic amplitude is specially processed.
And finishing the discrimination of the characteristic amplitude and the duration of the voltage transient event.
Calculate the root mean square value with respect to the point-by-point refresh method of FIG. 1; and step one, calculating a cycle square root mean square value of half cycle update, comparing the cycle square root value with a starting threshold value of a transient event, and determining a half-wave position where the fault occurs. The specific method comprises the following steps: and calculating the square root value of the half-cycle refreshing voltage and recording and storing the value, wherein the measurement data window is the square root measurement value of the voltage of one cycle, and the half cycle is updated once. And comparing the calculated half-wave refreshing root mean square value with a voltage sag starting threshold (0.1p.u. -0.9 p.u.), starting voltage sag when the half-wave refreshing root mean square value is smaller than the voltage sag starting threshold, and recording the position of the half wave at the moment.
And step two, calculating the root mean square by adopting point-by-point refreshing, and determining the sampling point when the fault occurs. The specific method comprises the following steps: after the half-wave position where the voltage sag occurs is determined, 1.5 cycles are pushed forward on the basis of the position to carry out point-by-point refreshing calculation of the root mean square value, the value is compared with the product of the voltage root mean square value which normally operates before the transient event occurs and the voltage sag starting threshold, when the point-by-point refreshing root mean square value is smaller than the product of the voltage and the voltage sag starting threshold, the position of the sampling point at the moment is recorded, and the fault starting time is determined.
And step three, determining the half-wave position where the fault is located at the end. The specific method comprises the following steps: and comparing the half-wave refreshing root mean square value with a voltage transient event ending threshold, and ending the voltage sag event when the half-wave refreshing root mean square value is greater than the voltage sag ending threshold, thereby determining the half-wave position where the fault is ended.
And step four, calculating the characteristic amplitude and the duration. The specific method comprises the following steps: after the half-wave position where the fault is ended is determined, 1.5 cycles are pushed forward on the basis of the position to perform point-by-point refreshing root mean square value calculation, the value is compared with the product of the voltage root mean square value which normally runs after the transient event is ended and a voltage sag ending threshold value, when the point-by-point refreshing root mean square value is larger than the product of the voltage and the voltage sag starting threshold value, the position of the sampling point at the moment is recorded, and the fault ending time is determined. The end time of the fault minus the start time is the duration of this voltage sag. From the occurrence of the fault to the completion of the fault, the root mean square value of the half-wave refreshing in the middle is compared to find out the minimum value, namely the characteristic amplitude, so that the voltage sag is taken as an example for explanation, and the minimum value is the characteristic value according to the definition of the characteristic value.
And when the duration time in the step five is less than 1.5 cycles, the characteristic amplitude is specially processed. Because the duration is too short, the judgment by adopting the half-wave refreshing root mean square value is likely to have deviation, so the half-wave root mean square value is compared with the threshold value of the voltage sag, the point-by-point refreshing root mean square value calculation is carried out on the sampling points in the fault occurrence period, and the minimum value is selected from the point-by-point refreshing root mean square values, namely the characteristic amplitude.
Example two
The present embodiment is directed to a computing device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method when executing the computer program.
EXAMPLE III
An object of the present embodiment is to provide a computer-readable storage medium.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Example four
The present embodiment is directed to a system for determining a characteristic amplitude and a duration of a voltage transient event, including:
a half-wave position determination module at which a fault occurs, configured to: comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs;
an event start time recording module configured to: determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event;
a half-wave position determination module at the end of the event configured to: comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended;
an event end time recording module configured to: performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time;
a duration and feature magnitude computation module configured to: and calculating the difference between the ending time and the starting time as the duration, and calculating the characteristic amplitude from the event occurrence to the end.
The steps involved in the apparatuses of the above second, third and fourth embodiments correspond to the first embodiment of the method, and the detailed description thereof can be found in the relevant description of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media containing one or more sets of instructions; it should also be understood to include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any of the methods of the present disclosure.
Those skilled in the art will appreciate that the modules or steps of the present disclosure described above can be implemented using general purpose computer means, or alternatively, they can be implemented using program code executable by computing means, whereby the modules or steps may be stored in memory means for execution by the computing means, or separately fabricated into individual integrated circuit modules, or multiple modules or steps thereof may be fabricated into a single integrated circuit module. The present disclosure is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The method for judging the characteristic amplitude and the duration of the voltage transient event is characterized by comprising the following steps:
comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs;
determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event;
comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended;
performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time;
the difference between the end time and the start time is the duration, and the feature amplitude is calculated from event occurrence to end.
2. The method according to claim 1, wherein when calculating the characteristic amplitude, if the duration is longer than a predetermined value, the method performs point-by-point refreshing on the sampling points during the occurrence of the fault to calculate the root mean square value, and obtains the characteristic amplitude, otherwise, obtains the characteristic amplitude from the half-wave refreshed root mean square value.
3. The method for determining the characteristic amplitude and the duration of the voltage transient event according to claim 1, wherein the half-wave position where the fault occurs is determined by comparing the half-wave refreshing root-mean-square value with the start threshold of the transient event, and specifically comprises:
and calculating the root mean square value of the half-cycle refreshing voltage from the sampling points, recording and storing the root mean square value, wherein a measurement data window is a voltage root mean square measurement value of one cycle, updating every half cycle once, comparing the calculated half-wave refreshing root mean square value with a voltage sag starting threshold value, and recording the position of the half wave when the half-wave refreshing root mean square value is smaller than the voltage sag starting threshold value and the voltage sag starting threshold value starts.
4. The method of claim 1, wherein the step of determining the characteristic amplitude and duration of the voltage transient event comprises the step of determining the sampling point position when the fault occurs by using a point-by-point refreshing calculation root mean square.
5. The method for determining the characteristic amplitude and the duration of the voltage transient event according to claim 1, wherein the determining the position of the sampling point when the fault occurs is specifically as follows:
after the half-wave position where the voltage sag occurs is determined, 1.5 cycles are pushed forward on the basis of the position to carry out point-by-point refreshing calculation of the root mean square value, the value is compared with the product of the voltage root mean square value which normally operates before the transient event occurs and the voltage sag starting threshold, when the point-by-point refreshing root mean square value is smaller than the product of the voltage and the voltage sag starting threshold, the position of the sampling point at the moment is recorded, and the fault starting time is determined.
6. A method for determining the characteristic amplitude and duration of a voltage transient event as claimed in claim 1, wherein the determining of the position of the sampling point at the end of the event is as follows:
and comparing the half-wave refreshing root mean square value with a voltage transient event ending threshold, and ending the voltage sag event when the half-wave refreshing root mean square value is greater than the voltage sag ending threshold, thereby determining the half-wave position where the fault is ended.
7. The method for determining the characteristic amplitude and the duration of the voltage transient event according to claim 1, wherein the characteristic amplitude and the duration are calculated by: after determining the half-wave position where the fault is ended, forward pushing 1.5 cycles to perform point-by-point refreshing root mean square value calculation on the basis of the position, comparing the value with the product of the voltage root mean square value which normally operates after the transient event is ended and a voltage sag ending threshold value, and recording the position of the sampling point at the moment when the point-by-point refreshing root mean square value is greater than the product of the voltage and the voltage sag starting threshold value, and determining the fault ending time; the end time of the fault minus the start time is the duration of this voltage sag.
8. The system for distinguishing the characteristic amplitude and the duration of the voltage transient event is characterized by comprising the following steps:
a half-wave position determination module at which a fault occurs, configured to: comparing the half-wave refreshing root mean square value with the starting threshold of the transient event to determine the half-wave position when the fault occurs;
an event start time recording module configured to: determining the position of a sampling point of a voltage transient event based on the position of a half-wave where the fault occurs, and recording the start time of the event;
a half-wave position determination module at the end of the event configured to: comparing the half-wave refreshing root mean square value with an ending threshold value of the transient event to obtain a half-wave position when the event is ended;
an event end time recording module configured to: performing point-by-point refreshing root mean square value calculation, comparing the point-by-point refreshing root mean square value with the product of the normal voltage root mean square value and the voltage sag ending threshold value, determining the position of a sampling point at which an event ends, and recording the event ending time;
a duration and feature magnitude computation module configured to: and calculating the difference between the ending time and the starting time as the duration, and calculating the characteristic amplitude from the event occurrence to the end.
9. A computing device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of claims 1 to 7 are performed when the program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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|---|---|---|---|---|
| CN112986744A (en) * | 2021-04-26 | 2021-06-18 | 湖南大学 | Frequency fault tolerance detection method and system under transient fault condition of power system |
| CN112986744B (en) * | 2021-04-26 | 2021-08-06 | 湖南大学 | Frequency fault tolerance detection method and system under transient fault condition of power system |
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| Publication number | Publication date |
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| CN112415258B (en) | 2021-08-24 |
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