CN111707867B - Alternating current measuring method and device, electronic equipment and storage medium - Google Patents
Alternating current measuring method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses an alternating current measuring method, an alternating current measuring device, electronic equipment and a storage medium, wherein the method is applied to electric energy measuring equipment, and the electric energy measuring equipment comprises an alternating current sensor, an alternating voltage sensor, a filter circuit and a measuring chip; the alternating current measuring method comprises the following steps: acquiring acquisition current information output by an alternating current sensor and acquisition voltage information output by an alternating voltage sensor; wherein, the alternating current sensor is a Rogowski coil; judging whether the collected current information is smaller than a current threshold value; if yes, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip; if not, determining the actual current of the tested line according to the collected current information. According to the technical scheme of the embodiment of the invention, different measuring methods are adopted according to the magnitude of the measured current, so that the electric energy metering equipment can realize high-precision current measurement in power utilization occasions with various measuring ranges.
Description
Technical Field
The embodiment of the invention relates to the field of electric energy measurement, in particular to an alternating current measuring method and device, electronic equipment and a storage medium.
Background
With the development of power systems, ac sampling measurement technology has gained more and more popularity and application, for example, electric energy metering equipment relying on ac sampling measurement technology is widely applied to industrial and residential electricity utilization occasions.
The electric energy metering equipment needs to collect current and voltage on a line firstly, and the metering chip determines the current and voltage on the line according to the collected data so as to measure the electricity consumption later. The current transformer and the Rogowski coil are both alternating current sensors and can be used for sampling and measuring alternating current.
However, the measurement range of the current transformer is small compared to the rogowski coil. The power consumption condition of different occasions is very complicated in consideration, and the power of each power consumption equipment is different in size, so that the current on the line is different in size, the electric energy metering equipment based on the current transformer cannot be applied to various occasions, and the practicability is low. Although the Rogowski coil has a wide measuring range, the accuracy is relatively low when small current is measured, so that the measuring accuracy of the Rogowski coil-based electric energy measuring equipment in each current measuring range is very necessary to be improved, and thus, the electric energy measuring equipment can be widely applied to various occasions and can realize high-accuracy current measurement in each occasion.
Disclosure of Invention
The invention provides an alternating current measuring method, an alternating current measuring device, electronic equipment and a storage medium, which are used for realizing wide-range and high-precision current measurement.
In a first aspect, an embodiment of the present invention provides an ac current measurement method, which is applied to an electric energy measurement device, where the electric energy measurement device includes an ac current sensor, an ac voltage sensor, a filter circuit, and a measurement chip, and an internal integration circuit is integrated in the measurement chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is respectively electrically connected with the alternating current sensor and the internal integrating circuit;
the alternating current measuring method comprises the following steps:
acquiring acquisition current information output by an alternating current sensor and acquisition voltage information output by an alternating voltage sensor; wherein, the alternating current sensor is a Rogowski coil;
judging whether the collected current information is smaller than a current threshold value; if yes, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip; if not, determining the actual current of the tested line according to the collected current information.
Optionally, before calculating the actual current of the measured line according to the actual power information and the collected voltage information of the metering chip, the method further includes:
judging whether the collected voltage information is larger than a voltage threshold value or not; if yes, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip; if not, determining the actual current of the tested line according to the collected current information.
Optionally, the metering chip includes a multiplier, and the multiplier is configured to calculate a product of the collected voltage information and the common-frequency collected current information as actual power information; the same-frequency collected current information is current information with the same frequency as collected voltage information in the collected current information;
calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip, wherein the method comprises the following steps:
the actual current is calculated according to the following formula:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information.
Optionally, determining the actual current of the measured line according to the collected current information includes:
presetting a corresponding relation between the collected current and the actual current in different measuring range ranges;
and determining the range of the acquired current information, and determining the actual current corresponding to the acquired current information according to the corresponding relation corresponding to the range of the acquired current information.
In a second aspect, an embodiment of the present invention provides an ac current measuring device, which is applied to an electric energy metering device, where the electric energy metering device includes an ac current sensor, an ac voltage sensor, a filter circuit, and a metering chip, and an internal integrating circuit is integrated in the metering chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is electrically connected with the alternating current sensor and the internal integrating circuit respectively;
the alternating current measuring device includes:
the acquisition information acquisition module is used for acquiring acquisition current information output by the alternating current sensor and acquisition voltage information output by the alternating voltage sensor; wherein, the alternating current sensor is a Rogowski coil;
the actual current determining module is used for judging whether the acquired current information is smaller than a current threshold value; if yes, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip; and if not, determining the actual current of the measured line according to the collected current information.
Optionally, the actual current determining module is further configured to determine whether the collected voltage information is greater than a voltage threshold; if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold, calculating the actual current of the tested line according to the actual power information and the collected voltage information of the metering chip; and if the collected current information is less than the current threshold and the collected voltage information is less than or equal to the voltage threshold, determining the actual current of the tested circuit according to the collected current information.
Optionally, the metering chip includes a multiplier, and the multiplier is configured to calculate a product of the collected voltage information and the common-frequency collected current information as actual power information; the same-frequency collected current information is current information with the same frequency as collected voltage information in the collected current information;
the actual current determination module is specifically configured to calculate the actual current according to the following formula if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information.
Optionally, the actual current determining module includes a corresponding relationship presetting unit and an actual current determining unit;
the corresponding relation presetting unit is used for presetting the corresponding relation between the collected current and the actual current in different measuring range ranges;
the actual current determining unit is used for determining the range of the acquired current information if the acquired current information is larger than the current threshold, and determining the actual current corresponding to the acquired current information according to the corresponding relation corresponding to the range.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
one or more processors; the processor comprises a metering chip;
a memory for storing one or more programs;
the alternating current sensor is used for collecting the current of the tested line; the alternating current sensor is a Rogowski coil;
the alternating voltage sensor is used for collecting the voltage of a measured line;
when executed by one or more processors, cause the one or more processors to implement the method of measuring alternating current as provided in any of the aspects above.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method for measuring ac current provided in any one of the above aspects.
According to the embodiment of the invention, the collected current information output by the alternating current sensor and the collected voltage information output by the alternating voltage sensor are obtained, when the collected current information is judged to be smaller than the current threshold value, the actual current of the measured line is calculated according to the actual power information and the collected voltage information of the metering chip, and when the collected current information is judged to be larger than or equal to the current threshold value, the actual current of the measured line is determined according to the collected current information. In particular, when the measuring current is larger, because the accuracy of the Rogowski coil for measuring large current is relatively higher, the proportion of interference signals in the collected current can be almost ignored, therefore, the actual current can be directly obtained according to the collected current information, and when the measured current is smaller, because the accuracy of the Rogowski coil in measuring the small current is relatively low, the collected current information contains more interference signals, the measurement result is inaccurate because the collected current information is directly utilized to obtain the actual current, considering, however, that the collected voltage information obtained by the ac voltage sensor is substantially stable, and the actual power information of the metering chip is obtained from the actual current and the collected voltage information, when the measured current is small, the actual current can be calculated according to the actual power information and the collected voltage information of the metering chip, so that the precision of measuring the small current is improved. According to the technical scheme of the embodiment of the invention, different measuring methods are adopted according to the magnitude of the measured current, so that the electric energy metering equipment can realize high-precision current measurement in power utilization occasions with various measuring ranges.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an AC current measuring method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of an AC current measuring method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an ac current measuring apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the filter circuit of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides an alternating current measuring method which is applied to electric energy metering equipment, and fig. 1 is a schematic structural diagram of electronic equipment provided by the embodiment of the invention, wherein the electronic equipment can be the electric energy metering equipment, and referring to fig. 1, the electric energy metering equipment comprises an alternating current sensor, an alternating voltage sensor, a filter circuit and a metering chip, and an internal integrating circuit is integrated in the metering chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is electrically connected with the alternating current sensor and the internal integrating circuit respectively.
Wherein, the alternating current sensor is a Rogowski coil. The output signal of the Rogowski coil is the differential of current to time, and the output signal can be restored into a current signal acquired by the Rogowski coil after passing through an integrating circuit. The ac voltage sensor is used for collecting voltage, and generally, the voltage is substantially fixed in the actual electricity using process, such as 220V (single phase) or 380V (three phase). Therefore, the electric energy metering equipment can calculate the electricity consumption of the user according to the collected current and voltage. In addition to metering electrical energy, it is often desirable for an electrical energy metering device to be able to obtain real-time data of the electrical current in order to calculate further data from the electrical current or to monitor the power usage. It should be noted that, if the electric energy metering device is used for measuring three-phase alternating current, the current condition of each phase needs to be measured.
The Rogowski coil has relatively high precision when measuring large current and relatively low precision when measuring small current, so the embodiment of the invention aims to provide the alternating current measuring method, so that the electric energy metering equipment can realize high-precision current measurement in power utilization occasions with various measuring ranges.
Fig. 2 is a schematic flowchart of an ac current measuring method according to an embodiment of the present invention, and referring to fig. 2, the ac current measuring method specifically includes the following steps:
s110, acquiring acquisition current information output by an alternating current sensor and acquisition voltage information output by an alternating voltage sensor; wherein, the alternating current sensor is a Rogowski coil;
the acquisition current information refers to acquisition current output by an output signal of the rogowski coil after passing through the filter circuit and the integrating circuit, and generally, the acquisition current is not actual current and contains a certain interference signal, so that in order to ensure measurement accuracy, a metering chip is required to obtain the actual current according to a preset program. The collected voltage information is relatively stable, for example, the voltage of each phase of the single-phase alternating current or the three-phase alternating current is 220V.
S120, judging whether the collected current information is smaller than a current threshold value; if yes, go to S130; if not, executing S140;
the current threshold may be preset according to the measurement accuracy of the rogowski coil, and the embodiment of the present invention does not limit the value of the current threshold. For example, if the measurement accuracy of the rogowski coil is low when the measurement current is less than 20A, the current threshold may be set to 20A.
S130, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip;
this method may be referred to as a power back-stepping current method. When the measured current is small, the accuracy of the Rogowski coil in measuring the small current is relatively low, the collected current information contains more interference signals, the numerical difference between the actual current and the interference current is small, and the measurement result is inaccurate due to the fact that the collected current information is directly utilized to obtain the actual current. However, considering that the collected voltage information obtained by the alternating voltage sensor is basically stable, and the actual power information of the metering chip is obtained by the actual current and the collected voltage information, when the measured current is small, the actual current can be calculated according to the actual power information and the collected voltage information of the metering chip, so that the accuracy of measuring the small current is improved. Illustratively, a multiplier is usually included in the metering chip, and the multiplier can output actual power information obtained from the actual current and the collected voltage, which will be described in detail later.
And S140, determining the actual current of the measured line according to the collected current information.
When the measuring current is large, the accuracy of the Rogowski coil in measuring the large current is relatively high, and the proportion of interference signals in the collected current can be almost ignored, so that the actual current can be directly obtained according to the collected current information. For example, a corresponding relationship between the collected current and the actual current may be preset, and after the collected current information is obtained, the actual current may be obtained according to the corresponding relationship, and the corresponding relationship is further described in detail later.
According to the embodiment of the invention, the acquired current information output by the alternating current sensor and the acquired voltage information output by the alternating voltage sensor are acquired, when the acquired current information is judged to be smaller than the current threshold value, the actual current of the measured line is calculated according to the actual power information and the acquired voltage information of the metering chip, and when the acquired current information is judged to be larger than or equal to the current threshold value, the actual current of the measured line is determined according to the acquired current information. According to the technical scheme of the embodiment of the invention, different measuring methods are adopted according to the magnitude of the measured current, so that the electric energy metering equipment can realize high-precision current measurement in power utilization occasions with various measuring ranges.
Fig. 3 is a schematic flow chart of an ac current measuring method according to another embodiment of the present invention, and the ac current measuring method is further optimized based on the above embodiments. Referring to fig. 3, the method specifically includes the following steps:
s110, acquiring acquisition current information output by an alternating current sensor and acquisition voltage information output by an alternating voltage sensor; wherein, the alternating current sensor is a Rogowski coil;
s120, judging whether the collected current information is smaller than a current threshold value; if yes, go to S121; if not, executing S140;
s121, judging whether the acquired voltage information is larger than a voltage threshold value; if yes, go to S130; if not, executing S140;
although the collected voltage in the actual power utilization process is basically stable, abnormal conditions such as a power failure state and some abnormal critical states, in which the voltage is almost 0, do not occur, and the actual current obtained by still adopting the power back-stepping current method will cause the abnormal measurement result of the actual current. Therefore, in order to avoid the current abnormality of the reverse thrust caused by the abnormal condition and increase the reliability of the current measurement result, the voltage criterion is added, and when the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold, the actual current is obtained by adopting a power reverse thrust current method. For example, the voltage threshold may be 10V, 20V, 50V, or the like, as long as it can be determined by comparing with the voltage threshold that the voltage of the line under test is not 0, and the embodiment of the present invention is not limited thereto.
S130, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip;
it can be understood that when the measured current is small, the collected current information contains more interference signals, and the difference between the actual current and the interference current is small, so that the collected current information cannot be directly used for determining the actual current, and the actual current cannot be screened from the collected current information. A power back-stepping current method is provided to improve measurement accuracy.
Optionally, the metering chip includes a multiplier, and the multiplier is configured to calculate a product of the collected voltage information and the common-frequency collected current information as actual power information; the same-frequency collected current information is current information with the same frequency as collected voltage information in the collected current information. Specifically, because the frequencies of the actual current and the interference current are different, only the frequency of the actual current is 50Hz and is the same as the frequency of the collected voltage information, the collected current information and the collected voltage information can be input into the multiplier, and the multiplier calculates the product of the collected voltage information and the same-frequency collected current information and outputs the actual power information. After obtaining the actual power information and the collected voltage information, the actual current can be calculated according to the following formula:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information. It should be noted that the actual power information and the collected voltage information are obtained at the same time.
In the method for reversely estimating the current by the power, because the actual power information is obtained by adopting a method of multiplying the same frequency, the method is equivalent to filtering the interference signals with the frequency different from the actual current, and therefore, the measurement precision is higher.
And S140, determining the actual current of the measured line according to the collected current information.
As described above, when the measured current is large, the correspondence between the collected current and the actual current may be set in advance, so as to obtain the actual current corresponding to the collected current information according to the correspondence. The current collected by the current sensor inevitably deviates from the actual current, and therefore, in order to obtain a more accurate measurement result, the electric energy metering device is usually calibrated before leaving the factory. Specifically, the corresponding relationship between the collected current and the actual current can be obtained through a pre-test, and the corresponding relationship is stored in a register of the metering chip, so that the corresponding relationship can be called in the actual use process, and the actual current can be obtained according to the corresponding relationship and the collected current.
The existing calibration method is usually a single-point calibration method, i.e., a single linear relationship exists between the collected current and the actual current. However, the current range that can be measured by rogowski coils is very wide, typically 1mA to 1 mA. According to the operating characteristics of the rogowski coil, the measurement accuracy of the rogowski coil is usually different when the current to be measured is in different measuring range. For example, when the current to be measured is larger than the above current threshold value, the measurement accuracy is relatively lower as the current to be measured is closer to the current threshold value, and the measurement accuracy is relatively higher as the current to be measured is farther from the above current threshold value. It can be seen that such a large range of current calibration using the single-point calibration method inevitably results in a decrease in the accuracy of the measurement result.
In order to improve the accuracy of the whole current measurement range, the present embodiment provides a segmental calibration method. Optionally, the corresponding relationship between the collected current and the actual current in different measuring range ranges can be preset; and determining the range of the acquired current information, and determining the actual current corresponding to the acquired current information according to the corresponding relation corresponding to the range of the acquired current information.
In this embodiment, the corresponding relationship between the collected current and the actual current in different measuring ranges is different, and specifically, the proportionality coefficients (linear relationship) between the collected current and the actual current in different measuring ranges are different. For example, when the acquired current information is 200A-400A, the proportionality coefficient is 4/3; when the collected current information is between 400A and 800A, the proportionality coefficient is 5/4. After the device is put into use, the actual current corresponding to the acquired current information can be determined according to the corresponding relation corresponding to the range by determining the range in which the acquired current information is located. Compared with a single-point meter calibration method, the embodiment of the invention has the advantages that the accuracy of the whole current measurement range is higher through the segmented meter calibration method, the high-accuracy current measurement of the electric energy metering equipment can be realized in the electricity utilization occasions with various measurement ranges, and the practicability and universality of the electric energy metering equipment are favorably improved.
Based on the same inventive concept, the embodiment of the invention provides an alternating current measuring device which is applied to electric energy metering equipment (see figure 1), wherein the electric energy metering equipment comprises an alternating current sensor, an alternating voltage sensor, a filter circuit and a metering chip, and an internal integrating circuit is integrated in the metering chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is electrically connected with the alternating current sensor and the internal integrating circuit respectively. Fig. 4 is a schematic structural diagram of an ac current measuring apparatus according to an embodiment of the present invention, and referring to fig. 4, the ac current measuring apparatus includes: an acquisition information acquiring module 210, configured to acquire acquisition current information output by the ac current sensor and acquisition voltage information output by the ac voltage sensor; wherein, the alternating current sensor is a Rogowski coil; an actual current determining module 220, configured to determine whether the acquired current information is smaller than a current threshold; if yes, calculating the actual current of the measured line according to the actual power information and the acquired voltage information of the metering chip; if not, determining the actual current of the tested line according to the collected current information.
Optionally, the actual current determining module 220 is further configured to determine whether the collected voltage information is greater than a voltage threshold; if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold, calculating the actual current of the tested line according to the actual power information and the collected voltage information of the metering chip; and if the collected current information is less than the current threshold and the collected voltage information is less than or equal to the voltage threshold, determining the actual current of the tested circuit according to the collected current information.
Optionally, the metering chip includes a multiplier, and the multiplier is configured to calculate a product of the collected voltage information and the common-frequency collected current information as actual power information; the same-frequency collected current information is current information with the same frequency as collected voltage information in the collected current information; the actual current determining module 220 is specifically configured to calculate the actual current according to the following formula if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information.
Optionally, the actual current determining module 220 includes a corresponding relationship presetting unit and an actual current determining unit, where the corresponding relationship presetting unit is configured to preset a corresponding relationship between the acquired current and the actual current in different range ranges, and the actual current determining unit is configured to determine the range in which the acquired current information is located if the acquired current information is greater than the current threshold, and determine the actual current corresponding to the acquired current information according to the corresponding relationship corresponding to the range.
As described in the ac current measurement method, the actual current determining module 220 may be further configured to determine a range where the collected current information is located when the collected current information is smaller than the current threshold and the collected voltage information is smaller than or equal to the voltage threshold, and determine the actual current corresponding to the collected current information according to a corresponding relationship corresponding to the range.
The alternating current measuring device provided by the embodiment of the invention can execute the alternating current measuring method provided by any embodiment of the invention, has the corresponding functional modules and beneficial effects of the execution method, and can be specifically referred to the description of the alternating current measuring method, and the description is not repeated herein.
It should be noted that, in the embodiment of the alternating current measuring apparatus, each included module is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific names of the functional modules are only for convenience of distinguishing from each other and are not used for limiting the protection scope of the present invention.
An embodiment of the present invention further provides an electronic device, which may be an electric energy metering device, and referring to fig. 1, the electronic device includes: one or more processors; the processor comprises a metering chip; a memory (not shown in FIG. 1) for storing one or more programs; the alternating current sensor is used for collecting the current of a measured line and is a Rogowski coil; the alternating voltage sensor is used for collecting the voltage of a measured line; when executed by one or more processors, cause the one or more processors to implement the method of measuring alternating current as provided in any of the embodiments above.
The memory, as a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the ac current measuring method in the embodiment of the present invention (for example, the collected information acquiring module 210 and the actual current determining module 220 in the ac current measuring apparatus). The processor executes various functional applications and data processing of the electronic device by executing the software programs, instructions and modules stored in the memory, so as to realize the alternating current measuring method.
In addition, the electronic equipment provided by the embodiment of the invention also improves the structure of the electric energy metering equipment. The conventional electric energy metering equipment is generally provided with an external integral circuit consisting of an operational amplifier to realize the reduction of differential output signals of the Rogowski coil.
Referring to fig. 1, optionally, the electronic device filter circuit is electrically connected between the rogowski coil and the internal integration circuit of the metering chip, and is configured to filter the interference signal, exemplarily, fig. 5 is a schematic structural diagram of the filter circuit in fig. 1, and as shown in fig. 5, the filter circuit is formed by an RC circuit, and can filter the interference signal, improve the measurement accuracy, and has a low cost and an integration function.
Based on the description of the alternating current measuring method, the electronic equipment can realize a wider current measuring range, can realize high-precision current measurement in various measuring ranges, and has good practicability.
Finally, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method for measuring an alternating current provided in any one of the above embodiments.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The alternating current measuring method is characterized by being applied to electric energy measuring equipment, wherein the electric energy measuring equipment comprises an alternating current sensor, an alternating voltage sensor, a filter circuit and a measuring chip, and an internal integrating circuit is integrated in the measuring chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is electrically connected with the alternating current sensor and the internal integrating circuit respectively;
the alternating current measuring method comprises the following steps:
acquiring collected current information output by the alternating current sensor and collected voltage information output by the alternating voltage sensor; wherein the alternating current sensor is a Rogowski coil;
judging whether the collected current information is smaller than a current threshold value; if so, calculating the actual current of the tested line according to the actual power information of the metering chip and the acquired voltage information; and if not, determining the actual current of the measured line according to the acquired current information.
2. The ac current measuring method according to claim 1, wherein before calculating the actual current of the line under test according to the actual power information of the metering chip and the collected voltage information, the method further comprises:
judging whether the acquired voltage information is greater than a voltage threshold value; if yes, calculating the actual current of the measured line according to the actual power information of the metering chip and the acquired voltage information; and if not, determining the actual current of the measured line according to the acquired current information.
3. The method according to claim 2, wherein the metering chip comprises a multiplier, and the multiplier is used for calculating the product of the collected voltage information and the same-frequency collected current information as the actual power information; the same-frequency collected current information is current information with the same frequency as the collected voltage information in the collected current information;
calculating the actual current of the measured line according to the actual power information of the metering chip and the acquired voltage information, wherein the method comprises the following steps:
calculating the actual current according to the following formula:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information.
4. The method of claim 1, wherein determining the actual current of the line under test from the collected current information comprises:
presetting a corresponding relation between the collected current and the actual current in different measuring range ranges;
and determining the range of the acquired current information, and determining the actual current corresponding to the acquired current information according to the corresponding relation of the range.
5. The alternating current measuring device is characterized by being applied to electric energy metering equipment, wherein the electric energy metering equipment comprises an alternating current sensor, an alternating voltage sensor, a filter circuit and a metering chip, and an internal integrating circuit is integrated in the metering chip; the alternating current voltage sensor is electrically connected with the metering chip, and the filter circuit is electrically connected with the alternating current sensor and the internal integrating circuit respectively;
the alternating current measuring device includes:
the acquisition information acquisition module is used for acquiring acquisition current information output by the alternating current sensor and acquisition voltage information output by the alternating voltage sensor; wherein the alternating current sensor is a Rogowski coil;
the actual current determining module is used for judging whether the acquired current information is smaller than a current threshold value; if yes, calculating the actual current of the measured line according to the actual power information of the metering chip and the acquired voltage information; and if not, determining the actual current of the tested line according to the acquired current information.
6. The ac current measuring device according to claim 5, wherein the actual current determining module is further configured to determine whether the collected voltage information is greater than a voltage threshold; if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold, calculating the actual current of the tested line according to the actual power information of the metering chip and the collected voltage information; and if the collected current information is less than the current threshold and the collected voltage information is less than or equal to the voltage threshold, determining the actual current of the tested circuit according to the collected current information.
7. The alternating current measuring device according to claim 6, wherein the metering chip comprises a multiplier, and the multiplier is used for calculating the product of the collected voltage information and the same-frequency collected current information as the actual power information; the same-frequency acquisition current information is current information with the same frequency as the acquisition voltage information in the acquisition current information;
the actual current determination module is specifically configured to calculate the actual current according to the following formula if the collected current information is smaller than the current threshold and the collected voltage information is larger than the voltage threshold:
wherein, I represents the actual current, P represents the actual power information, and U represents the collected voltage information.
8. The alternating current measuring device according to claim 5, wherein the actual current determining module includes a correspondence relationship presetting unit and an actual current determining unit;
the corresponding relation presetting unit is used for presetting the corresponding relation between the collected current and the actual current in different measuring range ranges;
the actual current determining unit is used for determining the range of the acquired current information if the acquired current information is larger than the current threshold value, and determining the actual current corresponding to the acquired current information according to the corresponding relation corresponding to the range.
9. An electronic device, comprising:
one or more processors comprising a metrology chip;
a memory for storing one or more programs;
the alternating current sensor is used for collecting the current of the tested line; the alternating current sensor is a Rogowski coil;
the alternating voltage sensor is used for collecting the voltage of a tested line;
when executed by the one or more processors, cause the one or more processors to implement the method of measuring alternating current as claimed in any one of claims 1-4.
10. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method of measuring alternating current according to any one of claims 1 to 4.
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