CN114487558B - Multi-stage adjustable non-contact voltage measurement method and device and power equipment - Google Patents
Multi-stage adjustable non-contact voltage measurement method and device and power equipment Download PDFInfo
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Abstract
The application relates to a multi-stage adjustable non-contact voltage measurement method, a multi-stage adjustable non-contact voltage measurement device, an electric power device, a storage medium and a computer program product. The method comprises the following steps: determining the voltage grade to be measured between two phases of power transmission lines to be measured; determining a trigger angle of the power field effect transistor according to the grade of the voltage to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range; acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle; and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state. The method adjusts the capacitance value through the power field effect tube, solves the problems that the switching of a measuring device is inconvenient and the variation range of the impedance value of the device is small in the voltage measurement of the power transmission line with different voltage grades, and improves the voltage measurement precision.
Description
Technical Field
The present application relates to the field of voltage measurement technologies, and in particular, to a multi-stage adjustable non-contact voltage measurement method and apparatus, an electrical device, a storage medium, and a computer program product.
Background
With the continuous development of power systems, large-scale distributed equipment is connected to a power grid, and massive power electronic devices frequently act. In order to ensure the safe and stable operation of the power system, the voltage needs to be monitored in a wider range. However, in order to ensure the insulation strength, the conventional voltage measurement and measurement device often has a complex insulation structure, so that the conventional voltage measurement and measurement device has the defects of large volume and heavy weight, and is difficult to be widely deployed. According to long-term research results, the non-contact voltage measurement technology is considered to be one of the key technologies for the voltage measurement requirement of the transmission line of the complex power system due to the economical efficiency and convenience.
At present, a mature non-contact voltage measurement scheme is a measurement method based on an electric field coupling technology. Most methods based on the scheme achieve the purpose of reducing measurement errors by introducing a reference source to set coupling stray capacitance formed by the probe and the lead in real time, and have too strict requirements on the reference voltage source, so that the economical efficiency of the method is poor. A non-contact voltage measuring method using combined resistor realizes setting of coupling capacitor and estimation of line voltage by using switching resistor, which has stronger economical efficiency, but the device uses electromagnetic mechanical switch, the mechanical switch can not operate normally under interference of strong field, and the problem of limited service life of mechanical contact is existed.
Disclosure of Invention
Therefore, it is necessary to provide a multi-stage adjustable non-contact voltage measuring method, a multi-stage adjustable non-contact voltage measuring device, an electric power device, a computer-readable storage medium, and a computer program product, which can solve the problems of inconvenient device switching and small device impedance value change range of the existing non-contact voltage measuring device.
In a first aspect, the present application provides a multi-stage adjustable non-contact voltage measurement method, which is applied to a non-contact voltage measurement device, where the non-contact voltage measurement device includes non-contact voltage measurement components arranged at different phases; each group of the non-contact voltage measuring components comprises a preceding stage measuring circuit; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop; the method comprises the following steps:
determining the voltage grade to be measured between the two-phase power transmission lines to be measured;
determining a trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
acquiring collected voltage signals at two ends of the measuring capacitor under corresponding working states based on each trigger angle;
and determining the line voltage between the two phases of power transmission lines to be tested according to the sampling voltage signals in each working state.
In one embodiment, the determining the line voltage between the two-phase power transmission line to be tested according to the sampled voltage signal in each operating state includes:
performing signal processing on the sampling voltage signal in each working state to obtain a corresponding measurement voltage magnitude value;
determining the impedance value of the conducting loop in each working state;
and establishing a loop current equation under each working state according to the impedance value and the measured voltage phase value, and determining the line voltage between the two-phase power transmission lines to be measured.
In one embodiment, the establishing a loop current equation under each working state according to the impedance value and the measured voltage phase value to determine the line voltage between the two-phase power transmission lines to be measured includes:
carrying out phase correction processing on the measured voltage magnitude value according to the phase reference signal to obtain a corrected magnitude value;
and establishing a loop current equation under each working state according to the impedance value and the corrected phasor value, and determining the line voltage between the two-phase power transmission lines to be detected.
In one embodiment, the determining the impedance value of the conducting loop in each of the operating states includes:
determining an equivalent capacitance value of the power field effect transistor in parallel connection with the measuring capacitor in each working state;
and processing the equivalent capacitance value to obtain the impedance value of the conducting loop in each working state.
In one embodiment, the establishing a loop current equation in each operating state according to the impedance value and the corrected phasor value to determine the line voltage between the two-phase power transmission lines to be measured includes:
obtaining the impedance value of the coupling capacitor in the conducting loop;
and establishing a loop current equation under each working state according to the impedance value of the coupling capacitor, the impedance value and the corrected phasor value, and determining the line voltage between the two-phase power transmission lines to be tested.
In one embodiment, the determining the firing angle of the power fet according to the voltage class to be measured includes:
and determining a first trigger angle and a second trigger angle of the voltage of the power field effect transistor in a normal working range according to the grade of the voltage to be measured.
In one embodiment, the acquiring, based on each of the trigger angles, a collected voltage signal across the measurement capacitor in a corresponding operating state includes:
acquiring a first acquisition voltage signal at two ends of the measuring capacitor in a corresponding first working state based on the first trigger angle; and
and acquiring a second acquisition voltage signal at two ends of the measurement capacitor in a corresponding second working state based on the second trigger angle.
In a second aspect, the present application further provides a multi-stage adjustable non-contact voltage measuring apparatus, which includes a non-contact voltage measuring apparatus including non-contact voltage measuring components arranged at different phases; each group of the non-contact voltage measuring components comprises a preceding stage measuring circuit; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop; the device further comprises:
the voltage grade determining module is used for determining the grade of the voltage to be measured between the two-phase power transmission lines to be measured;
the trigger angle determining module is used for determining the trigger angle of the power field effect transistor according to the voltage grade to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
the signal processing module is used for acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
In a third aspect, the present application also provides an electrical device. The power device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:
determining the voltage grade to be measured between the two-phase power transmission lines to be measured;
determining a trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
determining the voltage grade to be measured between the two-phase power transmission lines to be measured;
determining a trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
acquiring collected voltage signals at two ends of the measuring capacitor under corresponding working states based on each trigger angle;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:
determining the voltage grade to be measured between the two-phase power transmission lines to be measured;
determining a trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
acquiring collected voltage signals at two ends of the measuring capacitor under corresponding working states based on each trigger angle;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
According to the multistage adjustable non-contact voltage measuring method, the multistage adjustable non-contact voltage measuring device, the electric power equipment, the storage medium and the computer program product, the trigger angle of the power field effect transistor is determined according to the voltage grade to be measured between the two-phase power transmission lines to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range; acquiring collected voltage signals at two ends of the measuring capacitor under corresponding working states based on each trigger angle; and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state. The method starts from the electric field coupling principle, introduces the power field effect tube to adjust the capacitance value, solves the problems that the switching of a measuring device is inconvenient and the change range of the impedance value of the device is small in the voltage measurement of the power transmission lines with different voltage grades, and improves the voltage measurement precision.
Drawings
FIG. 1 is a block diagram of a multi-stage adjustable noncontact voltage measurement device in one embodiment;
FIG. 2 is a schematic flow chart illustrating a multi-stage tunable non-contact voltage measurement method according to an embodiment;
FIG. 3 is a schematic flow chart of a multi-stage adjustable noncontact voltage measurement method in another embodiment;
FIG. 4 is an application scenario of the multi-stage tunable non-contact voltage measurement method in one embodiment;
FIG. 5 is a circuit diagram of a measurement loop under harmonic interference in one embodiment;
FIG. 6 is a block diagram of a multi-stage tunable contactless voltage device according to an embodiment of the present invention;
fig. 7 is an internal structural view of an electric power device in one 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.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
In one embodiment, as shown in fig. 1, a block diagram of a multi-stage adjustable non-contact voltage measuring device is provided, wherein b in fig. 1 is a block diagram of a specific block of the measuring device shown in a in fig. 1. The three-phase electric wire in the a comprises an A-phase live wire, a B-phase live wire and a C-phase live wire; the same non-contact voltage measuring device (which can also be understood as a non-contact voltage measuring component in a multi-stage adjustable non-contact voltage measuring device) is arranged between any two phases of the A phase, the B phase and the C phase. Each group of non-contact voltage measuring components comprises a preceding stage measuring circuit, a succeeding stage signal processing module, a communication module and a power supply module; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop.
Furthermore, the preceding stage measuring circuit comprises a first voltage sensing probe and a second voltage sensing probe besides a measuring capacitor and a power field effect transistor, wherein the measuring capacitor is connected with the first voltage sensing probe and the second voltage sensing probe in series, the other end of the first voltage sensing probe is coupled with a power transmission line to be measured, and the other end of the second voltage sensing probe is coupled with power transmission lines to be measured in different phases; the power FET is connected in parallel with the measuring capacitor, and the signal is provided by a post STM32 data processor. The post-stage signal processing module comprises a filter circuit, an analog-to-digital converter, an STM32 data processor and a storage unit. The filter circuit is used for filtering the acquired acquisition voltage signal; the analog-to-digital converter is used for converting the acquired analog signals into digital signals; for example, the acquired voltage analog signal is converted into a digital signal. The STM32 data processor processes and converts the digital signal input by the analog-to-digital converter into a digital signal containing the information of the voltage phasor value of the measuring line (i.e. the digital signal of the input collected voltage signal is subjected to digital conversion processing to obtain a digital signal containing the information of the voltage phasor value of the measuring line), and outputs the digital signal to the storage unit.
Specifically, determining a trigger angle of a power field effect tube according to the voltage grade to be measured between two phase power transmission lines to be measured; the trigger angles are used for adjusting the voltage of the measuring capacitor within a normal working range, and acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle; and the post-stage signal processing module analyzes and processes the acquired voltage signals at two ends of the measuring capacitor in each working state, and determines the line voltage between the two-phase power transmission lines to be measured.
Optionally, in an embodiment, the non-contact voltage measuring device includes three sets of non-contact voltage measuring assemblies arranged between different phases, where the trigger signals of the power field effect transistors of the three sets of preceding stage measuring circuits are the same signal.
In one embodiment, as shown in fig. 2, a multi-stage adjustable noncontact voltage measurement method is provided, which is exemplified by the application of the method to the noncontact voltage measurement assembly in fig. 1, and includes the following steps:
The two-phase power transmission line to be tested can be any two-phase live wire in the three-phase power transmission line. For example, the three phases include an a-phase live line, a B-phase live line, and a C-phase live line (hereinafter, simply referred to as an a-phase, a B-phase, and a C-phase), and the two-phase power line to be measured includes at least one of an a-phase live line and a B-phase live line two-phase power line, a B-phase live line and a C-phase live line two-phase power line, and an a-phase live line and a C-phase live line two-phase power line. The voltage level to be measured between the two-phase power transmission lines to be measured is predetermined according to the power supply requirements of the power system. The voltage levels differ between the different phase lines. In this embodiment, a description is given by taking an example of measuring line voltages of an a-phase live line and a B-phase live line two-phase transmission line, a B-phase live line and a C-phase live line two-phase transmission line, and an a-phase live line and a C-phase live line two-phase transmission line in a three-phase transmission line, where the line voltages of any two phases are measured in the same method, and an example of any two phases is taken.
Specifically, when the two-phase power transmission line to be measured is determined, the voltage level to be measured is determined according to the voltage range between the two-phase power transmission line to be measured.
And 204, determining the trigger angle of the power field effect transistor according to the grade of the voltage to be measured.
Wherein, the range of the trigger angle of the power field effect transistor is 0 to 180 degrees; and in the conducting loop, a measuring capacitor and a first coupling capacitor and a second coupling capacitor are included, and the measuring capacitor is connected with the first coupling capacitor and the second coupling capacitor in series. The voltage of the measuring capacitor is adjusted within a normal working range by adjusting the angle of the trigger angle of the power field effect transistor, so that the safety and the stability of the circuit are ensured. The voltage grades of different phase lines are different, and the angles of the trigger angles of the power field effect transistors, which need to be adjusted, are also different in the conduction loop.
Specifically, a group of trigger angles of the power field effect transistor is determined according to the voltage grade to be measured, and the angle of the trigger angles is determined.
And step 206, acquiring the collected voltage signals at the two ends of the measuring capacitor under the corresponding working state based on each trigger angle.
Specifically, a group of trigger angles of the power field effect transistor is determined according to the voltage grade to be measured, and the angle of the trigger angles is determined. And when the power field effect transistor is adjusted to the corresponding trigger angle, sampling voltage signals at two ends of the measuring capacitor to obtain a collected voltage signal in each working state.
And step 208, determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
Specifically, a sampling voltage signal and a sampling parameter in each working state are obtained, and the sampling voltage signals at two ends of the measurement capacitor are subjected to signal processing according to the sampling parameters to obtain a measurement voltage magnitude value. Determining the impedance value of a conducting loop in each working state; and establishing a loop current equation under each working state according to the impedance value and the measured voltage magnitude value, and determining the line voltage between the two-phase power transmission lines to be measured. The sampling parameters comprise a fundamental frequency, a sampling frequency and a signal sampling point number.
In the multistage adjustable non-contact voltage measurement method, the trigger angle of the power field effect transistor is determined according to the voltage grade to be measured between the two-phase power transmission lines to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range; acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle; and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state. The multistage adjustable non-contact voltage measurement method starts from the electric field coupling principle, introduces the power field effect tube to adjust the capacitance value, solves the problems that the switching of a measuring device is inconvenient and the change range of the impedance value of the device is small in the voltage measurement of the power transmission lines with different voltage grades, and improves the voltage measurement precision.
In one embodiment, as shown in fig. 3, a multi-stage adjustable noncontact voltage measurement method is provided, which is exemplified by the application of the method to the noncontact voltage measurement assembly in fig. 1, and includes the following steps:
And step 304, determining the trigger angle of the power field effect transistor according to the grade of the voltage to be measured.
Specifically, a first trigger angle and a second trigger angle of the voltage of the power field effect transistor in a normal working range are determined according to the grade of the voltage to be measured. Wherein the angles of the first firing angle and the second firing angle are not equal. For example, in a three-phase electric wire, two-phase transmission lines to be measured are a phase a and a phase B; determining a group of trigger angles of the power field effect transistor according to the to-be-detected voltage grades of the A phase and the B phase, namely the first trigger angle
Second firing angle
. The first firing angle is less than the second firing angle.
Specifically, a first acquisition voltage signal at two ends of a measurement capacitor in a corresponding first working state is acquired based on a first trigger angle; and acquiring a second acquisition voltage signal at two ends of the measurement capacitor in a corresponding first working state based on the second trigger angle.
And 308, performing signal processing on the sampling voltage signal in each working state to obtain a corresponding measurement voltage magnitude value.
Specifically, a first acquisition voltage signal at two ends of a measurement capacitor in a corresponding first working state is acquired based on a first trigger angle; and acquiring a first acquisition voltage signal at two ends of the measurement capacitor in a corresponding second working state based on the second trigger angle. And performing signal processing on the first sampling voltage signal in the first working state to obtain a corresponding measurement voltage magnitude value. And performing signal processing on the second sampling voltage signal in the second working state to obtain a corresponding measurement voltage magnitude value.
Wherein, the first sampling voltage signal under the first working state
To obtain corresponding voltage magnitude values of the measurement voltage
It can be expressed as:
wherein,
when the firing angle of the power field effect transistor is a first firing angle
At the same time, the voltage signal sampling value (namely the first collected voltage signal) at two ends of the capacitor is measured,
which represents the fundamental frequency of the wave,
representing the sampling frequency and N the number of signal samples.
For the second sampling voltage signal in the second working state
To obtain corresponding voltage magnitude values of the measurement voltage
Can be expressed as:
wherein,
when the flip angle of the power FET is a second flip angle
At that time, the voltage signal sampling value (i.e.,
which represents the fundamental frequency of the wave,
representing the sampling frequency and N the number of signal sampling points.
Specifically, phase reference signals under different working states are determined in consideration of phase deviation caused by applying FFT of different time windows to sampled voltage waveforms before and after capacitance value change; and according to the phasor value of the phase reference signal in the fundamental frequency under different working states. Measuring voltage phasor value under the first working state according to the phasor value under the first working state
Performing phase correction to obtain corresponding corrected phasor value
. Measuring voltage phasor value under the second working state according to the phasor value under the second working state
Performing phase correction to obtain corresponding corrected phasor value
。
Wherein, the phasor value in the first working state
Can be expressed as:
wherein,
which represents the fundamental frequency of the wave,
representing the sampling frequency corrected phase value; wherein,
representing the initial phase angle of the reference signal. The phase reference signal is generated by the clock count of STM32 and serves only as a phase reference.
Measuring voltage phasor value under the first working state according to the phasor value under the first working state
Performing phase correction to obtain corresponding corrected phasor value
Can be expressed as:
wherein the phasor value in the second working state
Can be expressed as:
in the formula:
the number of interval points of the sampling starting time of two times in sequence under the second working state is shown,
which represents the fundamental frequency of the wave,
representing the sampling frequency correction phase value.
According to phasor values
For the measured voltage magnitude value under the second working state
Performing phase correction to obtain corresponding corrected phasor value
Can be expressed as:
in step 312, the impedance value of the conductive loop in each operating state is determined.
Specifically, determining an equivalent capacitance value of the power field effect transistor in parallel connection with the measuring capacitor in each working state; and processing the equivalent capacitance value to obtain the impedance value of the conduction loop in each working state. In other words, the change of the parallel equivalent capacitance value can be realized by adjusting the switch converter (namely, the firing angle of the power field effect transistor), when the firing angle of the power field effect transistor is different
And when the power field effect transistor is connected with the measuring capacitor in parallel, the equivalent capacitance value is as follows:
wherein,
the trigger angle of the power field effect transistor is shown, and C represents the capacitance value of the measuring capacitor connected in parallel.
The equivalent capacitance value is processed to obtain an impedance value of the conduction loop in each operating state, which can be expressed as:
further, when the firing angle of the power field effect transistor is the first firing angle
When the equivalent capacitance value of the power field effect transistor and the measuring capacitor connected in parallel is
The obtained impedance value of the conducting loop in each operating state can be expressed as:
when the trigger angle of the power field effect transistor is a second trigger angle
When the equivalent capacitance value of the power field effect transistor and the measuring capacitor connected in parallel is
The obtained impedance value of the conducting loop in each operating state can be expressed as:
and step 314, establishing a loop current equation under each working state according to the impedance value and the corrected phasor value, and determining the line voltage between the two-phase power transmission lines to be detected.
Specifically, acquiring an impedance value parameter of a coupling capacitor in a conducting loop; and establishing a loop current equation under each working state according to the impedance value parameter, the impedance value and the corrected phasor value of the coupling capacitor by using the kirchhoff voltage law. And determining the line voltage between the two-phase power transmission lines to be measured and the impedance value of the coupling capacitor in the measuring loop by solving a loop current equation.
The loop current equation established by kirchhoff's voltage law in each working state can be expressed as:
optionally, in an embodiment, as shown in fig. 4, for an application scenario of the multi-stage adjustable non-contact voltage measurement method, the three-phase electric wire includes an a-phase live wire, a B-phase live wire, and a C-phase live wire; the same non-contact voltage measuring assembly is arranged among any two phases of the A phase, the B phase and the C phase, and the line voltage among any two phases of the A phase, the B phase and the C phase needs to be measured. I.e. three identical sets of contactless voltage measurement assemblies are arranged.
The non-contact voltage measurement assembly comprises a preceding stage measurement circuit, a signal processing module, a communication module and a power supply module; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop. The signal processing module comprises a filter circuit, an analog-to-digital converter, an STM32 data processor and a storage unit. The pre-stage measuring circuit comprises a voltage sensing probe I, a voltage sensing probe II, a measuring capacitor and a power field effect transistor, wherein the measuring capacitor is connected with the voltage sensing probe I and the voltage sensing probe II in series, the other end of the voltage sensing probe I is coupled with a power transmission line to be measured, and the other end of the voltage sensing probe II is coupled with the power transmission line to be measured in different phases; the power field effect transistors are connected with the measuring capacitors in parallel, and the trigger signals of the power field effect transistors of the three groups of front-stage measuring circuits are the same signal which is provided by a rear-stage STM32 data processor. The trigger signals of the power field effect transistors of the three groups of front-stage measuring circuits are the same signal, and the signal is provided by a rear-stage STM32 data processor.
Specifically, determining the voltage grade to be measured between A, B two-phase power transmission lines to be measured; and determining a first trigger angle and a second trigger angle of the power field effect tube according to the grade of the voltage to be measured. Acquiring a first acquisition voltage signal at two ends of the measurement capacitor in a corresponding first working state based on the first trigger angle; and acquiring a second acquisition voltage signal at two ends of the measurement capacitor in a corresponding first working state based on the second trigger angle.
Processing the first sampling voltage signal in the first working state to obtain the corresponding measurement voltage magnitude value
. Processing the second sampling voltage signal in the second working state to obtain the corresponding voltage magnitude value
. According to the phasor value in the first working state, carrying out phase correction processing on the measured voltage phasor value in the first working state to obtain a corresponding corrected phasor value
. According to the phasor value in the second working state, carrying out phase correction processing on the measured voltage phasor value in the second working state to obtain a corresponding corrected phasor value
。
When the trigger angle of the power field effect transistor is a first trigger angle
When the power field effect tube is connected with the measuring capacitor in parallel, the equivalent capacitance value is
. When the trigger angle of the power field effect transistor is a second trigger angle
When the equivalent capacitance value of the power field effect transistor and the measuring capacitor connected in parallel is
。
Acquiring impedance value parameters of a coupling capacitor in a conducting loop; and establishing a loop current equation under each working state according to the impedance value parameter, the impedance value and the corrected phasor value of the coupling capacitor by using the kirchhoff voltage law. Determining line voltage phasor value between A, B two-phase power transmission lines to be tested by solving loop current equation
And measuring the impedance value of the coupling capacitor in the loop. According to the above-mentioned processing steps, the line voltage phasor value of BC and CA two-phase power transmission line can be obtained
，
And equivalent impedance value of coupling capacitance of BC and CA two-phase power transmission line measuring loop
。
Further, the problem of harmonic pollution associated with the introduction of power fets is being considered. Harmonic pollution caused by input of power electronic equipment is reduced by erecting three same measuring mechanisms at intervals. By establishing a three-phase loop model with harmonic source acting independently and using a node voltage equation to obtain line voltage acted on an end line by harmonic generated by a switching device
And
finally, the mechanism for reducing the harmonic pollution by adopting the scheme is analyzed.
Specifically, as shown in fig. 5, a circuit diagram of a measurement loop under harmonic interference in one embodiment is provided, which can equivalently set the power supply of the power system to zero, only consider the equivalent harmonic source effect generated by the preceding-stage measurement circuit, and calculate the equivalent impedance value of the preceding-stage measurement circuit:
wherein,
represented as A, B equivalent impedance value of the coupling capacitance between the two phases,
represented as B, C equivalent impedance value of the coupling capacitance between the two phases,
represented as C, A equivalent impedance value of the coupling capacitance between the two phases,
denoted as harmonic frequencies.
Establishing a node voltage equation by using kirchhoff's law:
in the formula:
represented as A, C two-phase line voltage phasor values generated by harmonic interference,
the line voltage magnitude of the two phases of B, C shown as the result of harmonic interference,
indicated as A, B magnitude of the harmonic source generated by the two-phase measurement device,
indicated as B, C magnitude of the harmonic source generated by the two-phase measurement device,
indicated as C, A the harmonic source magnitude generated by the two-phase measurement device,
representing the power line impedance.
Wherein:
because the condition number of the matrix on the left side of the equation is not large, the node voltage equation can be approximately solved to obtain the line voltage value:
since the third harmonic content in the harmonic is the largest, the present embodiment aims to reduce the pollution of the third harmonic to the system, and the standard value of the impedance of the indirect coupling capacitor recorded under the frequency of the third harmonic is
When the impedance of the inter-phase coupling capacitor is the standard value
When the three devices are deployed among the phases, the third harmonic can be completely filtered. Therefore, three groups of non-contact voltage measurement components are introduced to reduce third harmonic interference generated by a power field effect transistor of a preceding stage measurement circuit.
In the multistage adjustable non-contact voltage measurement method, the trigger angle of the power field effect transistor is determined according to the voltage grade to be measured between the two-phase power transmission lines to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range; acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle; and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state. The method starts from the electric field coupling principle, introduces the power field effect tube to adjust the capacitance value, solves the problems that the switching of a measuring device is inconvenient and the change range of the impedance value of the device is small in the voltage measurement of the power transmission lines with different voltage grades, and improves the voltage measurement precision; harmonic interference brought by a measuring device is reduced by introducing the same measuring component; and then guarantee electric power system safe operation and accurate fortune dimension.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the application also provides a multistage adjustable non-contact voltage measuring device for realizing the multistage adjustable non-contact voltage measuring method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so specific limitations in one or more embodiments of the multistage adjustable non-contact voltage measurement device provided below can be referred to the limitations on the multistage adjustable non-contact voltage measurement method in the foregoing, and details are not repeated here.
In one embodiment, as shown in fig. 6, there is provided a multi-stage adjustable non-contact voltage measuring device, the device comprising a non-contact voltage measuring device comprising non-contact voltage measuring components arranged between different phases; each group of the non-contact voltage measuring assemblies comprises a preceding stage measuring circuit; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop; the apparatus further comprises a voltage level determination module 602, a firing angle determination module 604, and a signal processing module 606, wherein:
a voltage level determining module 602, configured to determine a voltage level to be measured between two-phase power transmission lines to be measured.
A trigger angle determining module 604, configured to determine a trigger angle of the power field effect transistor according to the voltage level to be measured; the firing angle is used to adjust the voltage of the measurement capacitor within a normal operating range.
A signal processing module 606, configured to obtain, based on each trigger angle, a collected voltage signal at two ends of the measurement capacitor in a corresponding working state;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
The multistage adjustable non-contact voltage measuring device determines the trigger angle of the power field effect transistor according to the voltage grade to be measured between the two-phase power transmission lines to be measured; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range; acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle; and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state. The method starts from the electric field coupling principle, introduces the power field effect tube to adjust the capacitance value, solves the problems that the switching of a measuring device is inconvenient and the change range of the impedance value of the device is small in the voltage measurement of the power transmission lines with different voltage grades, and improves the voltage measurement precision.
In one embodiment, a multi-stage adjustable contactless voltage measurement apparatus is provided, which comprises, in addition to a voltage level determination module 602, a firing angle determination module 604 and a signal processing module 606: phase place correction processing module and voltage signal acquisition module, wherein:
optionally, in an embodiment, the signal processing module 606 is further configured to perform signal processing on the sampled voltage signal in each working state to obtain a corresponding measured voltage magnitude value; and determining the impedance value of the conducting loop in each working state.
And establishing a loop current equation under each working state according to the impedance value and the measured voltage magnitude value, and determining the line voltage between the two phases of power transmission lines to be measured.
And the phase correction processing module is used for carrying out phase correction processing on the measurement voltage magnitude value according to the phase reference signal to obtain a corrected magnitude value.
Optionally, in an embodiment, the signal processing module 606 is further configured to establish a loop current equation in each operating state according to the impedance value and the modified phasor value, and determine a line voltage between the two-phase power transmission lines to be measured.
Optionally, in an embodiment, the signal processing module 606 is further configured to determine an equivalent capacitance value of the power fet in parallel with the measurement capacitor in each operating state;
and processing the equivalent capacitance value to obtain the impedance value of the conduction loop in each working state.
Optionally, in an embodiment, the signal processing module 606 is further configured to obtain an impedance value parameter of a coupling capacitor in the conductive loop;
and establishing a loop current equation under each working state according to the impedance value parameter, the impedance value and the corrected phasor value of the coupling capacitor, and determining the line voltage between the two-phase power transmission lines to be measured.
Optionally, in an embodiment, the firing angle determining module 604 is further configured to determine a first firing angle and a second firing angle of the voltage of the power fet in the normal operating range according to the voltage level to be measured.
The voltage signal acquisition module is used for acquiring a first acquisition voltage signal at two ends of the measurement capacitor in a corresponding first working state based on the first trigger angle; and
and acquiring a second acquisition voltage signal at two ends of the measurement capacitor in a corresponding second working state based on the second trigger angle.
All or part of each module in the multistage adjustable non-contact voltage measuring device can be realized by software, hardware and a combination thereof. The modules may be embedded in a hardware form or may be independent of a processor in the electrical device, or may be stored in a memory in the electrical device in a software form, so that the processor calls and executes operations corresponding to the modules.
In one embodiment, a power device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 7. The power device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input device. The processor, the memory and the input/output interface are connected by a system bus, and the communication interface, the display unit and the input device are connected by the input/output interface to the system bus. Wherein the processor of the power device is configured to provide computing and control capabilities. The memory of the power equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program to run on the non-volatile storage medium. The input/output interface of the power device is used for exchanging information between the processor and an external device. The communication interface of the power equipment is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a multi-level tunable contactless voltage measurement method.
Those skilled in the art will appreciate that the configuration shown in fig. 7 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the power device to which the present application is applied, and that a particular power device may include more or less components than those shown in the figures, or combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data need to comply with the relevant laws and regulations and standards of the relevant country and region.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure 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 present application. 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 application shall be subject to the appended claims.
Claims (10)
1. The multistage adjustable non-contact voltage measuring method is characterized by being applied to a non-contact voltage measuring device, wherein the non-contact voltage measuring device comprises non-contact voltage measuring components which are arranged at different phases; each group of the non-contact voltage measuring assemblies comprises a preceding stage measuring circuit; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the preceding stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop; the method comprises the following steps:
determining the voltage grade to be measured between the two-phase power transmission lines to be measured;
determining a trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
acquiring collected voltage signals at two ends of the measuring capacitor under corresponding working states based on each trigger angle;
and determining the line voltage between the two-phase power transmission lines to be detected according to the sampling voltage signals in each working state.
2. The method of claim 1, wherein determining the line voltage between the two-phase power transmission line under test based on the sampled voltage signal at each operating condition comprises:
performing signal processing on the sampling voltage signal in each working state to obtain a corresponding measurement voltage magnitude value;
determining the impedance value of the conducting loop under each working state;
and establishing a loop current equation under each working state according to the impedance value and the measured voltage phase value, and determining the line voltage between the two-phase power transmission lines to be measured.
3. The method of claim 2, wherein the step of establishing a loop current equation for each operating state according to the impedance values and the measured voltage magnitude values to determine the line voltage between the two-phase power transmission lines to be tested comprises the steps of:
carrying out phase correction processing on the measured voltage magnitude value according to the phase reference signal to obtain a corrected magnitude value;
and establishing a loop current equation under each working state according to the impedance value and the corrected phasor value, and determining the line voltage between the two-phase power transmission lines to be detected.
4. The method of claim 2, wherein said determining the impedance value of said conductive loop for each of said operating states comprises:
determining an equivalent capacitance value of the power field effect transistor in parallel connection with the measuring capacitor in each working state;
and processing the equivalent capacitance value to obtain the impedance value of the conducting loop in each working state.
5. The method of claim 3, wherein the establishing a loop current equation for each operating state according to the impedance value and the modified phasor value to determine the line voltage between the two-phase power transmission lines to be tested comprises:
acquiring impedance value parameters of a coupling capacitor in the conducting loop;
and establishing a loop current equation under each working state according to the impedance value parameter of the coupling capacitor, the impedance value and the corrected phasor value, and determining the line voltage between the two-phase power transmission lines to be detected.
6. The method of claim 1, wherein determining the firing angle of the power fet based on the voltage level to be measured comprises:
and determining a first trigger angle and a second trigger angle of the voltage of the power field effect transistor in a normal working range according to the grade of the voltage to be measured.
7. The method of claim 6, wherein said obtaining a collected voltage signal across said measurement capacitor in a corresponding operating state based on each said firing angle comprises:
acquiring a first acquisition voltage signal at two ends of the measuring capacitor in a corresponding first working state based on the first trigger angle; and
and acquiring a second acquisition voltage signal at two ends of the measurement capacitor in a corresponding second working state based on the second trigger angle.
8. The multi-stage adjustable non-contact voltage measuring device is characterized by comprising a non-contact voltage measuring device and a non-contact voltage measuring component, wherein the non-contact voltage measuring device comprises non-contact voltage measuring components which are arranged between different phases; each group of the non-contact voltage measuring assemblies comprises a preceding stage measuring circuit; the preceding stage measuring circuit comprises a measuring capacitor and a power field effect tube; the pre-stage measuring circuit and the two-phase power transmission line to be measured form a conducting loop; the device further comprises:
the voltage grade determining module is used for determining the grade of the voltage to be measured between the two-phase power transmission lines to be measured;
the trigger angle determining module is used for determining the trigger angle of the power field effect transistor according to the voltage grade to be detected; the trigger angle is used for adjusting the voltage of the measuring capacitor within a normal working range;
the signal processing module is used for acquiring collected voltage signals at two ends of the measuring capacitor in a corresponding working state based on each trigger angle;
and determining the line voltage between the two phases of power transmission lines to be tested according to the sampling voltage signals in each working state.
9. An electrical device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 7.
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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