CN110554231A - Voltage monitoring method, voltage monitoring device, computer equipment and storage medium - Google Patents
Voltage monitoring method, voltage monitoring device, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a voltage monitoring method, a voltage monitoring device, computer equipment and a computer readable storage medium, wherein the voltage monitoring method comprises the following steps: detecting the zero crossing point time of the alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point time; calculating a half-period effective value of the alternating current signal according to the sampled voltage; judging whether a voltage fault occurs or not based on the half-period effective value; recording fault voltage waveform of the alternating current signal under the condition of voltage fault; wherein the voltage fault comprises at least one of a voltage sag or interruption and a voltage sag. According to the voltage monitoring method, the signal frequency is calculated by obtaining the zero crossing point time of the alternating current signal, so that the half-cycle effective value of the alternating current signal is obtained, the electric energy quality characteristic indexes such as rapid voltage change and the like are judged according to the half-cycle effective value, and the fault voltage waveform is recorded when the problems such as voltage sag, voltage interruption, voltage sag and the like are determined.
Description
Technical Field
The present invention relates to the field of voltage monitoring technologies, and in particular, to a voltage monitoring method, a voltage monitoring device, a computer device, and a computer-readable storage medium.
Background
At present, more and more users adopt electric equipment with good performance and high efficiency, and the electric equipment is generally sensitive to the change of power supply characteristics, so that the requirements of the users on the quality of electric energy are continuously improved. However, some power quality disturbance events often occur in the power system, for example, a voltage sag is a serious power quality problem, a voltage sag refers to a phenomenon that a power supply voltage suddenly drops and then rises again and recovers in a short time, and such power supply problems may affect the electric equipment, so such power problems need to be monitored.
the traditional voltage monitoring method generally measures the voltage change amplitude directly, but due to the complex working environment in the power grid and the randomness and the transient property of the power supply problems such as voltage sag and the like, the traditional voltage monitoring method cannot quickly and accurately monitor and record the electric energy problem.
disclosure of Invention
in view of the foregoing, it is necessary to provide a voltage monitoring method, a voltage monitoring apparatus, a computer device, and a computer readable storage medium, which can monitor the power quality problems such as voltage sag events in real time and accurately record the voltage waveforms.
A method of monitoring a voltage, comprising:
detecting a zero crossing point moment of an alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point moment;
Calculating a half-period effective value of the alternating current signal according to the sampled voltage;
judging whether a voltage fault occurs or not based on the half-cycle effective value;
Recording a fault voltage waveform of the alternating current signal under the condition of voltage fault;
wherein the voltage fault comprises at least one of a voltage sag, a voltage interruption, and a voltage sag.
according to the voltage monitoring method, the signal frequency is calculated by obtaining the zero crossing point time of the alternating current signal, so that the half-cycle effective value of the alternating current signal is obtained, the electric energy quality characteristic indexes such as rapid voltage change and the like are judged according to the half-cycle effective value, and the fault voltage waveform is recorded when the problems such as voltage sag, voltage interruption, voltage sag and the like are determined.
in one embodiment, after the zero-crossing time of the ac signal, the method further includes:
judging whether the sampling periods of two adjacent zero-crossing points exceed a preset sampling range or not;
And under the condition that the sampling period exceeds a preset sampling range, setting a virtual zero-crossing point between the two zero-crossing points.
in one embodiment, the alternating current signal is a single-phase alternating current signal, and recording a fault voltage waveform of the alternating current signal in the event of a voltage fault includes:
when the effective value of the half period is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
When the half-cycle effective value is recovered to be equal to or higher than the preset sag threshold value plus hysteresis loop voltage, stopping recording the voltage waveform;
the recorded voltage waveform is used as a fault voltage waveform.
in one embodiment, the ac signal is a multi-phase ac signal, and recording a fault voltage waveform of the ac signal in the event of a voltage fault includes:
When the effective value of the half period of one or more channels is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
When the half-cycle effective values of all the channels are recovered to be equal to or higher than the preset sag threshold value plus hysteresis voltage, stopping recording the voltage waveform;
The recorded voltage waveform is used as a fault voltage waveform.
In one embodiment, the preset sag threshold is set in a range of 85% to 90% of the reference voltage.
In one embodiment, the method further comprises:
Isolating the direct current signal;
Calculating the average value of the direct current signal;
And recording the fault voltage waveform of the direct current signal under the condition that the average value exceeds a preset range.
In one embodiment, before the calculating the average value of the dc signal, the method further includes:
and setting hysteresis for the upper limit value and the lower limit value of the preset range.
A voltage monitoring device comprising:
The sampling module is used for detecting the zero crossing point moment of the alternating current signal and sampling the voltage of the alternating current signal at the zero crossing point moment;
The calculating module is used for calculating a half-cycle effective value of the alternating current signal according to the sampled voltage;
The judging module is used for judging whether a voltage fault occurs or not based on the half-cycle effective value;
The recording module is used for recording the fault voltage waveform of the alternating current signal under the condition of voltage fault;
wherein the voltage fault comprises at least one of a voltage sag, a voltage interruption, and a voltage sag.
the voltage monitoring device calculates the signal frequency by acquiring the zero crossing point time of the alternating current signal, so as to obtain the half-cycle effective value of the alternating current signal, judges the electric energy quality characteristic indexes such as rapid voltage change and the like according to the half-cycle effective value, and records the fault voltage waveform when determining the problems such as voltage sag, voltage interruption, voltage sag and the like.
a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
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.
Drawings
FIG. 1 is a schematic flow chart of a voltage monitoring method according to an embodiment;
FIG. 2 is a schematic flow chart of the steps for obtaining the zero-crossing point time of the AC signal in one embodiment;
FIG. 3 is a waveform diagram of voltages in one embodiment;
FIG. 4 is a schematic flow chart of a process for recording a fault voltage waveform of the AC signal in accordance with one embodiment;
FIG. 5 is a schematic flow chart of steps for recording a fault voltage waveform of the AC signal in accordance with another embodiment;
FIG. 6 is a schematic flow chart of a voltage monitoring method according to another embodiment;
fig. 7 is a schematic structural diagram of a voltage monitoring device in another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
fig. 1 is a schematic flow chart of a voltage monitoring method in an embodiment, as shown in fig. 1, in an embodiment, a voltage monitoring method includes:
Step S120: and detecting the zero crossing point time of the alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point time.
step S140: and calculating the half-cycle effective value of the alternating current signal according to the sampled voltage.
Step S160: and judging whether a voltage fault occurs or not based on the half-cycle effective value.
Step S180: in the event of a voltage fault, a fault voltage waveform of the ac signal is recorded.
Specifically, when detecting a voltage fault, a zero-crossing point time of an alternating current signal is detected first, and a time when a sine wave of the alternating current signal alternates between positive and negative half waves is the zero-crossing point time of the alternating current signal. The detection of the zero crossing point can be realized by arranging a sampling device on the alternating current line. After the zero-crossing point moment of the alternating current signal is detected, the voltage of the alternating current signal at the zero-crossing point moment is sampled to calculate data such as a half-cycle effective value of the alternating current signal. If the thermal effect of the alternating current signal is equal to that of the direct current signal of a certain voltage, the voltage of the direct current signal can be considered to be the effective voltage value of the alternating current signal, the effective voltage value of the alternating current signal is sampled and calculated at the zero-crossing point moment, ripples of a calculation result can be reduced, and the calculation stability is improved. According to the obtained half-period effective value, it can judge that said alternating current signal has the fault of voltage sag, voltage interruption or voltage rise, etc.. For example, the voltage change amount between two adjacent samples may be calculated, and the minimum value of the calculated values obtained several times in succession may be used as the voltage change rate to determine whether the voltage change rate exceeds a threshold value at which the voltage rapidly changes. If the voltage does not exceed the threshold for rapid voltage fluctuation, it is considered that the ac signal is not failed, and if the voltage exceeds the threshold for rapid voltage fluctuation, it is considered that the ac signal is failed.
After the alternating current signal is determined to have a fault, the waveform of the fault voltage needs to be recorded, so that data such as the amplitude of voltage sag or rise, the fault duration, the number of faults and the like are obtained. Specifically, the control of the waveform of the alternating current signal can be realized by controlling the switching value. When the alternating current signal has voltage sag and other faults, the waveform recording function is realized through the empty time of the switching value. Specifically, the switching value may be synchronously recorded in the waveform data, and as a signal for starting waveform recording, for example, the signal is set to be active low (or active high), and when the switching value is low (or active high), the signal is marked as a switching value input action. For the digital quantity input signal, the current switch state can be judged according to the threshold value of the previous state setting jump, and whether the waveform recording is needed or not is judged according to the set action requirement. For the analog input signal, the average value calculation can be carried out and whether the average value exceeds the upper limit or the lower limit can be judged, so that whether the waveform recording is needed can be judged.
the recording of the waveform can be realized by arranging a data acquisition device such as a digital-to-analog converter, and the recording queue of the waveform can be accessed and rewritten by a plurality of partial programs. For example, the harmonic analysis section, the data acquisition section, and the communication section may be specifically included. The harmonic analysis part and the data acquisition part only perform writing operation and writing operation, and the communication part only performs reading operation. In order to ensure that the recording data is not lost when the communication fails, a circular queue can be used for storing recording and broadcasting events. And the communication speed needs to exceed the wave recording speed, otherwise the recorded waveform data or the measurement result may not be uploaded in time.
According to the voltage monitoring method, the signal frequency is calculated by obtaining the zero crossing point time of the alternating current signal, so that the half-cycle effective value of the alternating current signal is obtained, the electric energy quality characteristic indexes such as rapid voltage change and the like are judged according to the half-cycle effective value, and the fault voltage waveform is recorded when the problems such as voltage sag, voltage interruption, voltage sag and the like are determined.
Fig. 2 is a schematic flow chart of a step of acquiring a zero-crossing point time of an ac signal in an embodiment, as shown in fig. 2, in an embodiment, after step S120, the method further includes:
step S122: and judging whether the sampling periods of two adjacent zero-crossing points exceed a preset sampling range.
Step S124: and under the condition that the sampling period exceeds the preset sampling range, setting a virtual zero crossing point between two zero crossing points.
Specifically, after the zero-crossing point time of the alternating current signal is obtained, whether the sampling period between adjacent zero-crossing points exceeds a preset range needs to be judged. If the voltage exceeds the preset range, the voltage interruption possibly exists, and the half-cycle effective value cannot be continuously calculated, so that the fault cannot be effectively judged. Therefore, if the sampling period between two adjacent zero-crossing points exceeds the preset sampling range, a virtual zero-crossing point should be set between the two zero-crossing points, so that the virtual zero-crossing point can meet the calculation requirement of the half-cycle effective value. The predetermined sampling range may be determined according to actual precision requirements, for example, in a preferred embodiment, the predetermined sampling period between two adjacent zero-crossing points may be set within 25ms, i.e. 40 Hz.
fig. 4 is a schematic flowchart of step S180 in an embodiment, as shown in fig. 4, in an embodiment, the alternating current signal is a single-phase alternating current signal, and step S180 may specifically include:
step S181: when the effective value of the half period is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
step S182: when the half-cycle effective value is recovered to be equal to or higher than the preset sag threshold value plus hysteresis voltage, stopping recording the voltage waveform;
step S183: the recorded voltage waveform is taken as the fault voltage waveform.
Specifically, fig. 3 is a schematic diagram of voltage waveforms in an embodiment, and as shown in fig. 3, when the voltage fault is a voltage sag, the waveform of the fault voltage to be recorded is the voltage waveform within the duration of the voltage sag. The duration is generally determined according to the relationship between the half-cycle effective value and the sag threshold, which can be generally set within the range of 85% to 90% of the fixed reference voltage. However, to prevent frequent actions at the sag threshold, hysteresis may be applied to the sag threshold to reduce the effect of voltage fluctuations on waveform recording. In a single-phase ac system, such as a 220V mains system, the duration of the voltage sag begins when the effective half-cycle value falls below the sag threshold and ends when the effective half-cycle value rises to return to a value equal to or higher than the sag threshold plus the hysteresis loop voltage, which is the duration of the voltage sag, and the waveform in the duration is recorded as the fault voltage waveform.
fig. 5 is a schematic flowchart of step S180 in another embodiment, as shown in fig. 5, in an embodiment, the ac signal is a multi-phase ac signal, and step S180 may specifically include:
step S184: when the effective value of the half period of one or more channels is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
Step S185: when the half-cycle effective values of all the channels are recovered to be equal to or higher than the preset sag threshold value plus hysteresis voltage, stopping recording the voltage waveform;
Step S186: the recorded voltage waveform is taken as the fault voltage waveform.
Further, in the multi-phase system, the duration of the voltage sag starts when the effective half-period values of one or more channels drop below the sag threshold, and ends when the effective half-period values of all the measurement channels rise and return to be equal to or higher than the sag threshold plus the hysteresis loop voltage. For example, in an ac power system of 380V, when the effective value of a half period of one phase in three phases is lower than a sag threshold, the effective value is recorded as the starting time of voltage sag. And when the half-cycle effective value of the three-phase voltage is totally raised and recovered to the temporarily lowered threshold value and the hysteresis loop voltage, the duration is considered to be finished.
fig. 6 is a schematic flow chart of a voltage monitoring method in another embodiment, and as shown in fig. 6, the voltage monitoring method further includes:
step S220: isolating the direct current signal;
Step S240: calculating the average value of the direct current signals;
Step S260: and recording the fault voltage waveform of the direct current signal when the average value exceeds a preset range.
Specifically, in addition to monitoring the ac signal, fault monitoring such as voltage sag, voltage interruption, and voltage sag may be performed on the dc signal. The method can be specifically realized by calculating an average value of the direct current signal, and when the average value of the direct current signal exceeds a preset range, the direct current signal is considered to have a voltage fault. The measurement of the direct current signal can be realized by a corresponding sampling device, generally, a direct current voltage transmitter is adopted to isolate one path of direct current signal, a linear optical coupler is arranged to isolate the direct current signal, the anti-interference capability of the signal is improved, the reverse current is not measured, and the average value of the direct current signal is calculated. Whether a wave recording request needs to be generated or not can be judged according to the obtained average value, when the average value exceeds the upper limit value of the preset range, voltage temporary rise can be generally considered to occur, when the average value is lower than the lower limit value of the preset range, voltage temporary drop can be generally considered to occur, and if the limit value is 0, the fault is not required.
Further, in an embodiment, before the step S260, the method further includes: and setting hysteresis for the upper limit value and the lower limit value of the preset range. In order to prevent the dc signal from frequently operating at the limit of the preset range, the recording of the waveform is affected. The hysteresis can be set for the upper limit value and the lower limit value of the preset range, so that when the average value exceeds the upper limit value, the voltage of the hysteresis is reduced to the upper limit value, or when the average value is lower than the lower limit value, the voltage of the hysteresis is increased to the lower limit value, and the voltage waveform of the fault is recorded, so that the recording of the voltage waveform of the fault of the direct current signal is more complete and stable.
fig. 7 is a schematic structural diagram of a voltage monitoring apparatus in an embodiment, and as shown in fig. 7, in an embodiment, a voltage detecting apparatus 500 includes: the sampling module 520 is configured to detect a zero-crossing point time of the ac signal, and sample a voltage of the ac signal at the zero-crossing point time; the calculating module 540 is configured to calculate a half-cycle effective value of the alternating current signal according to the sampled voltage; a judging module 560, configured to judge whether a voltage fault occurs based on the half-cycle valid value; a recording module 580 for recording a fault voltage waveform of the ac signal in case of a voltage fault; wherein the voltage fault includes at least one of a voltage sag, a voltage interruption, and a voltage sag.
specifically, in the voltage monitoring apparatus 500, the sampling module 520 may be a sampling apparatus disposed on an ac line, and the sampling module 520 detects a zero-crossing point time of an ac signal by sampling the ac signal, performs sampling at the zero-crossing point time, and sends obtained sampling data to the calculating module 540. The calculating module 540 calculates a half-cycle effective value of the alternating current signal according to the received zero-crossing sampling data, and sends the calculated half-cycle effective value to the judging module 560. The judging module 560 judges a voltage fault of the ac signal based on the received half-cycle effective value, determines whether the ac signal has a voltage fault by comparing the half-cycle effective value with a preset sag threshold value, a sag threshold value, and the like, and if the ac signal has a voltage fault, the judging module determines the type of the voltage fault and transmits a recording command to the recording module 580. The recording module 580 records the fault voltage waveform of the ac signal after receiving the recording command, and may store the recorded waveform in a corresponding storage device for subsequent analysis to complete monitoring of the voltage fault.
The voltage monitoring device 500 obtains the half-cycle effective value of the alternating current signal by calculating the signal frequency at the zero-crossing point time of the alternating current signal, judges the electric energy quality characteristic index such as the rapid voltage change according to the half-cycle effective value, and records the fault voltage waveform when determining the problems such as voltage sag, voltage interruption and voltage sag.
in one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to perform the steps of: detecting the zero crossing point time of the alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point time; calculating a half-period effective value of the alternating current signal according to the sampled voltage; judging whether a voltage fault occurs or not based on the half-period effective value; recording fault voltage waveform of the alternating current signal under the condition of voltage fault; wherein the voltage fault comprises at least one of a voltage sag or interruption and a voltage sag.
in one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, may cause the processor to perform the steps of: detecting the zero crossing point time of the alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point time; calculating a half-period effective value of the alternating current signal according to the sampled voltage; judging whether a voltage fault occurs or not based on the half-period effective value; recording fault voltage waveform of the alternating current signal under the condition of voltage fault; wherein the voltage fault comprises at least one of a voltage sag or interruption and a voltage sag.
For the above limitations of the computer-readable storage medium and the computer device, reference may be made to the above specific limitations of the method, which are not described herein again.
it should be noted that, as one of ordinary skill in the art can appreciate, all or part of the processes of the above methods may be implemented by instructing related hardware through a computer program, and the program may be stored in a computer-readable storage medium; the above described programs, when executed, may comprise the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM) or a Random Access Memory (RAM).
the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
the above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. a method of monitoring a voltage, comprising:
detecting a zero crossing point moment of an alternating current signal, and sampling the voltage of the alternating current signal at the zero crossing point moment;
Calculating a half-period effective value of the alternating current signal according to the sampled voltage;
Judging whether a voltage fault occurs or not based on the half-cycle effective value;
Recording a fault voltage waveform of the alternating current signal under the condition of voltage fault;
wherein the voltage fault comprises at least one of a voltage sag or interruption and a voltage sag.
2. The method of claim 1, wherein after the detecting a zero-crossing time of the alternating current signal, the method further comprises:
Judging whether the sampling periods of two adjacent zero-crossing points exceed a preset sampling range or not;
and under the condition that the sampling period exceeds a preset sampling range, setting a virtual zero-crossing point between the two zero-crossing points.
3. the method of claim 1, wherein the ac signal is a single-phase ac signal, and wherein recording a fault voltage waveform of the ac signal in the event of a voltage fault comprises:
When the effective value of the half period is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
When the half-cycle effective value is recovered to be equal to or higher than the preset sag threshold value plus hysteresis loop voltage, stopping recording the voltage waveform;
The recorded voltage waveform is used as a fault voltage waveform.
4. The method of claim 1, wherein the ac signal is a multi-phase ac signal, and wherein recording a fault voltage waveform of the ac signal in the event of a voltage fault comprises:
when the effective value of the half period of one or more channels is reduced to be lower than a preset sag threshold value, starting to record the voltage waveform of the alternating current signal;
when the half-cycle effective values of all the channels are recovered to be equal to or higher than the preset sag threshold value plus hysteresis voltage, stopping recording the voltage waveform;
the recorded voltage waveform is used as a fault voltage waveform.
5. The method of claim 3 or 4, wherein the preset sag threshold is set in the range of 85% to 90% of the reference voltage.
6. the method of claim 1, further comprising:
isolating the direct current signal;
calculating the average value of the direct current signal;
And recording the fault point voltage waveform of the direct current signal under the condition that the average value exceeds a preset range.
7. The method of claim 6, wherein prior to said averaging said DC signal, said method further comprises:
And setting hysteresis for the upper limit value and the lower limit value of the preset range.
8. A voltage monitoring device, comprising:
The sampling module is used for detecting the zero crossing point moment of the alternating current signal and sampling the voltage of the alternating current signal at the zero crossing point moment;
The calculating module is used for calculating a half-cycle effective value of the alternating current signal according to the sampled voltage;
The judging module is used for judging whether a voltage fault occurs or not based on the half-cycle effective value;
the recording module is used for recording the fault voltage waveform of the alternating current signal under the condition of voltage fault;
Wherein the voltage fault comprises at least one of a voltage sag, a voltage interruption, and a voltage sag.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 6 are implemented 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 according to any one of claims 1 to 6.
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