Intelligent measurement switch calibration method, system and product based on energy quantization ladder characteristics

Abstract

The application discloses an intelligent measurement switch calibration method and system based on energy quantization ladder characteristics, and relates to the technical field of electric power measurement calibration.The application abandons the traditional calibration thought based on continuous average, and instead considers the energy quantization ladder characteristics, takes the pulse rising edge timestamp as the benchmark, and directly calculates the energy increment difference between the adjacent two timestamps of the standard source and the measured intelligent measurement switch to perform error calibration, thereby avoiding three possible errors caused by the traditional pulse method, and being capable of shortening the calibration time and improving the calibration accuracy of the intelligent measurement switch.

Description

Technical Field

[0001] This invention relates to the field of electrical force measurement and calibration technology, specifically to: 1. a calibration method for intelligent measurement switches based on energy quantization ladder characteristics, which aims to improve the calibration speed and accuracy of intelligent measurement switches; 2. a calibration system for intelligent measurement switches based on energy quantization ladder characteristics; 3. a computer program product. Background Technology

[0002] Intelligent measurement switches are low-voltage switching devices equipped with high-precision current sensors and measurement units. They can realize local or remote interaction of measurement data, are suitable for AC 50Hz power distribution lines with a working voltage not exceeding 440V and a rated current not exceeding 800A, and can be installed in low-voltage metering boxes.

[0003] Whether intelligent metering switches can continuously and accurately measure electrical energy is a topic worthy of research. Traditional pulse-based calibration relies on the "steady-state assumption," which assumes that electrical energy changes continuously and uniformly. However, the physical reality of pulse-based calibration is that energy accumulates non-linearly in a "step-like" manner in the form of "quantized" pulses. This "step-like" increase is ignored as noise in conventional calibration, leading to the following problems: 1. There are three possible errors: ① Step start phase error (i.e., when the standard source starts outputting, the meter under test may miss just half a pulse, resulting in a fixed deviation); ② Quantization step jitter error (i.e., when the current is small, the pulse interval is very long, and the actual power change cannot be perceived in the "no information interval" between two pulses); ③ Pulse cumulative truncation error (i.e., if the calibration time is not an integer multiple of the pulse period, the contribution of the last incomplete pulse is ignored or approximated).

[0004] 2. To counteract the impact of the cumulative nature of electrical energy in pulse form on the assumption that "electrical quantity changes continuously and uniformly," the pulse method employs "averaging": calculating the total number of pulses over a longer time window, comparing it with a standard source, and then using the average error for correction. This method is time-consuming, and because calibration involves multiple standard current values, it takes a long time to generate a single pulse under low current conditions, significantly extending the overall calibration time. For example, for a smart metering switch with a pulse constant of 120 imp / kWh, if a 10A current and 220V voltage are applied during calibration, the output time of a single pulse is 13.63s; this time becomes 1363s when the current is 1A. Therefore, to achieve an accuracy of one percent solely based on pulse counting, theoretically 0.38 hours are needed at 10A current and 220V voltage; however, this time becomes 3.8 hours at 1A current. Summary of the Invention

[0005] Therefore, it is necessary to provide a calibration method, system, and product for intelligent measurement switches based on the energy quantization ladder characteristics to address the problems of three possible errors and excessively long calibration time that exist in the existing pulse method for calibrating intelligent measurement switches.

[0006] This invention is achieved using the following technical solution: In a first aspect, the present invention discloses a smart measurement switch calibration method based on energy quantization ladder characteristics, comprising: S1, adjust the standard source to standard voltage U and standard current I, and apply them synchronously to the intelligent measurement switch under test; S2, examine whether the standard source outputs stable electrical energy; If the standard source outputs stable electrical energy, then capture each rising edge of the pulse output by the smart measuring switch under test in real time and record its corresponding timestamp and electrical energy of the measuring switch. S3, calculate the increase in electrical energy of the smart measurement switch under test between two adjacent timestamps; Calculate the increase in standard electrical energy between two adjacent timestamps based on standard voltage U and standard current I. S4. Calculate the difference between the standard increase in electrical energy between two adjacent timestamps and the increase in electrical energy of the smart measuring switch under test, and use it as the corresponding error value for calibration.

[0007] The implementation of this intelligent measurement switch calibration method based on the energy quantization ladder feature is according to the method or process of embodiments of this disclosure.

[0008] Secondly, the present invention discloses an intelligent measurement switch calibration system based on energy quantization ladder characteristics, which uses the intelligent measurement switch calibration method based on energy quantization ladder characteristics disclosed in the first aspect.

[0009] The intelligent measurement switch calibration system based on the energy quantization ladder feature includes: an electrical application module, a data monitoring module, and a data calibration module.

[0010] The power application module is used to: adjust the standard source to standard voltage U and standard current I, and apply them synchronously to the intelligent measurement switch under test; The data monitoring module is used to: examine whether the standard source outputs stable electrical energy; if the standard source outputs stable electrical energy, it captures the rising edge of each pulse output by the smart measuring switch under test in real time and records its corresponding timestamp and electrical energy of the measuring switch. The data calibration module is used to: calculate the increase in electrical energy of the tested smart measuring switch between two adjacent timestamps; calculate the standard increase in electrical energy between two adjacent timestamps based on the standard voltage U and standard current I; calculate the difference between the standard increase in electrical energy between two adjacent timestamps and the increase in electrical energy of the tested smart measuring switch, and use it as the corresponding error value for calibration.

[0011] The implementation of this intelligent measurement switch calibration system based on the energy quantization ladder feature is according to the method or process of an embodiment of this disclosure.

[0012] Thirdly, the present invention discloses a computer program product, comprising a computer program. When executed by a processor, the computer program implements the steps of the intelligent measurement switch calibration method based on energy quantization ladder characteristics disclosed in the first aspect.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention abandons the traditional calibration approach based on continuous averaging and instead considers the energy quantization ladder characteristics. It uses the pulse rising edge timestamp as a reference and directly calculates the difference in electrical energy increment between the standard source and the smart measuring switch under test between two adjacent timestamps for error calibration. This avoids the three possible errors caused by the traditional pulse method and can improve the calibration accuracy of the smart measuring switch while shortening the calibration time. Attached Figure Description

[0014] To more clearly illustrate the solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 The variation of the energy difference ΔW between the energy increase of the intelligent measuring switch provided by the present invention and the actual energy increase output by the calibration platform as a function of pulse time Δt. Figure 2 The flowchart shows the intelligent measurement switch calibration method based on energy quantization ladder characteristics provided in Embodiment 1 of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] First of all, it should be noted that, see Figure 1 The inventors, through pulse analysis, discovered that because the electrical charge is assumed to change continuously and uniformly, the increase in electrical energy of the intelligent measuring switch does not reflect the actual increase in electrical energy output from the calibration platform (which is equipped with an adjustable standard source supporting various standard voltages and currents)—there is an electrical energy difference ΔW between the two. Within a pulse time Δt, the electrical energy difference ΔW changes monotonically with time; and when time t = n × Δt (n = 1, 2, 3, ...), the electrical energy difference ΔW is 0—this is because the electrical energy added by the metering chip built into the intelligent measuring switch is sufficient to output a pulse.

[0020] Therefore, in the measurement and calibration process, the present invention uses only the intelligent measurement switch energy value when the metering chip outputs a pulse each time, thereby greatly reducing the error caused by the "steady-state assumption" and the resulting extension of calibration time.

[0021] Example 1 See Figure 2 The flowchart illustrates the intelligent measurement switch calibration method based on energy quantization ladder characteristics provided in Embodiment 1, which includes the following steps: S1, adjust the standard source to standard voltage U and standard current I, and apply them synchronously to the intelligent measurement switch under test.

[0022] Referring to the above, the standard source is usually built into the calibration platform. Therefore, it is recommended to also install the smart measurement switch under test on the calibration platform and connect it in series with the smart measurement switch under test (and connect a load if necessary) to achieve power application.

[0023] It should be noted that the standard voltage U is taken from the preset calibration voltage range; the standard current I is taken from the preset calibration current range.

[0024] The preset calibration current range and preset calibration voltage range are recommended to be based on the range of the intelligent measuring switch being measured.

[0025] S2, examine whether the standard source outputs stable electrical energy; If the standard source outputs stable electrical energy, then capture the rising edge of each pulse output by the intelligent measuring switch under test in real time and record its corresponding timestamp and electrical energy of the measuring switch.

[0026] To facilitate subsequent calculations, the recorded timestamps and measured switch electrical energy can be converted into a sequence, thus obtaining the timestamp sequence P and the electrical energy sequence Q.

[0027] Where P={T1,T2,...,T n};T i This represents the timestamp corresponding to the rising edge of the i-th pulse; Q={W1,W2,...,W n};W i This represents the electrical energy of the measured switch corresponding to the rising edge of the i-th pulse; i∈[1,n]; n is the total number of rising edges of the pulse.

[0028] Of course, if the standard source fails to output stable electrical energy, there may be a hardware or software error in the calibration platform or the standard source. In this case, the process should be paused immediately and an error message should be reported. S1 should be restarted only after the calibration platform or / and the standard source have been repaired.

[0029] S3, calculate the increase in electrical energy of the smart measurement switch under test between two adjacent timestamps.

[0030] Calculate the increase in standard electrical energy between two adjacent timestamps based on the standard voltage U and the standard current I.

[0031] Taking the m-th timestamp and the (m+1)-th timestamp as examples, the increase in electrical energy W of the corresponding smart measuring switch under test is as follows: m It can be represented as: W m =W m+1 -W m (where W) m+1 W represents the electrical energy of the measured switch corresponding to the rising edge of the (m+1)th pulse. m This represents the measured switch energy corresponding to the rising edge of the m-th pulse, and the corresponding increase in standard energy WS. m It can be represented as: WS m =UI(T m+1 -Tm (In the formula, T) m+1 T represents the timestamp corresponding to the rising edge of the (m+1)th pulse; m (represents the timestamp corresponding to the rising edge of the m-th pulse); m∈[1,n-1].

[0032] S4. Calculate the difference between the standard increase in electrical energy between two adjacent timestamps and the increase in electrical energy of the smart measuring switch under test, and use it as the corresponding error value for calibration.

[0033] Taking the m-th timestamp and the (m+1)-th timestamp as an example, the corresponding difference (i.e., error value) ΔW m This can be represented as: ΔW m =WS m -W m .

[0034] Of course, the above steps S1 to S4 only consider the standard voltage U and standard current I under a certain combination. Considering the actual needs of calibrating the intelligent measuring switch under test, the following steps can be added: S5, adjust the standard current I within the preset calibration current range, and repeat S1~S4 until all calibration current values ​​are traversed. Or / and, adjust the standard voltage U within the preset calibration voltage range, and repeat S1~S4 until all calibration voltage values ​​are traversed.

[0035] Through the above process, the intelligent measuring switch under test can be calibrated quickly and efficiently within its measuring range, and measurement errors can be easily compensated to improve the accuracy of subsequent measurements.

[0036] Example 2 This embodiment 2 discloses an intelligent measurement switch calibration system based on energy quantization ladder characteristics, which uses the aforementioned intelligent measurement switch calibration method based on energy quantization ladder characteristics. The intelligent measurement switch calibration system based on energy quantization ladder characteristics includes: a power application module, a data monitoring module, and a data calibration module.

[0037] The power application module is configured to adjust the standard source to standard voltage U and standard current I, and apply them synchronously to the intelligent measurement switch under test.

[0038] The data monitoring module is configured to: examine whether the standard source outputs stable electrical energy; if the standard source outputs stable electrical energy, capture each rising edge of the pulse output by the smart measuring switch under test in real time and record its corresponding timestamp and electrical energy of the measuring switch.

[0039] The data calibration module is configured to: calculate the increase in electrical energy of the smart measuring switch under test between two adjacent timestamps; calculate the standard increase in electrical energy between two adjacent timestamps based on the standard voltage U and the standard current I; calculate the difference between the standard increase in electrical energy between two adjacent timestamps and the increase in electrical energy of the smart measuring switch under test, and use it as the corresponding error value for calibration.

[0040] Of course, a loop module can also be added and configured to: adjust the standard current I within the preset calibration current range and repeatedly run the power application module, data monitoring module, and data calculation module until all calibration current values ​​are traversed; or / and, adjust the standard voltage U within the preset calibration voltage range and repeatedly run the power application module, data monitoring module, and data calculation module until all calibration voltage values ​​are traversed.

[0041] A pause module can also be added and configured to pause and report an error if the standard source cannot output stable electrical energy.

[0042] Since the above system uses the intelligent measurement switch calibration method based on the energy quantization ladder feature, it has the same effect, so it will not be repeated here.

[0043] Example 3 This embodiment 3 discloses a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the intelligent measurement switch calibration method based on energy quantization ladder characteristics disclosed in embodiment 1.

[0044] The computer equipment can be either a mobile terminal or a fixed terminal. Examples of the former include mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and in-vehicle terminals (such as in-vehicle navigation terminals); examples of the latter include digital TVs and desktop computers.

[0045] This embodiment 3 also discloses a readable storage medium that stores computer program instructions. When the computer program instructions are read and run by a processor, the steps of the intelligent measurement switch calibration method based on energy quantization ladder characteristics disclosed in embodiment 1 are executed.

[0046] The readable storage medium may include, but is not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the foregoing.

[0047] This embodiment 3 also discloses a computer program product, including a computer program. When executed by a processor, this computer program implements the steps of the intelligent measurement switch calibration method based on energy quantization ladder characteristics disclosed in embodiment 1.

[0048] It should be noted that the computer program used to execute the above can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as C or similar languages. The computer program can be executed entirely on the user's computer, partially on the user's computer, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer through any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN).

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for calibrating intelligent measurement switches based on the energy quantization ladder characteristic, characterized in that, It includes: S1, adjust the standard source to standard voltage U and standard current I, and apply them synchronously to the intelligent measurement switch under test; S2, examine whether the standard source outputs stable electrical energy; If the standard source outputs stable electrical energy, then capture each rising edge of the pulse output by the smart measuring switch under test in real time and record its corresponding timestamp and electrical energy of the measuring switch. S3, calculate the increase in electrical energy of the smart measurement switch under test between two adjacent timestamps; Calculate the increase in standard electrical energy between two adjacent timestamps based on standard voltage U and standard current I. S4. Calculate the difference between the standard increase in electrical energy between two adjacent timestamps and the increase in electrical energy of the smart measuring switch under test, and use it as the corresponding error value for calibration.

2. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 1, characterized in that, In S1, the intelligent measurement switch under test is connected in series with the intelligent measurement switch under test.

3. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 1, characterized in that, The standard voltage U is taken from the preset calibration voltage range; the standard current I is taken from the preset calibration current range.

4. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 1, characterized in that, In S2, if the standard source fails to output stable electrical energy, it will be paused and an error will be reported.

5. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 4, characterized in that, In S2, the increase in electrical energy W of the measured smart measurement switch between the m-th timestamp and the (m+1)-th timestamp is... m The expression is: IN m =W m+1 -IN m ; In the formula, W m+1 W represents the electrical energy of the measured switch corresponding to the rising edge of the (m+1)th pulse. m This represents the electrical energy of the measured switch corresponding to the rising edge of the m-th pulse; m∈[1,n-1].

6. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 5, characterized in that, In S2, the standard increase in electrical energy WS between the m-th timestamp and the (m+1)-th timestamp is... m The expression is: WS m =UI(T m+1 -T m ); In the formula, T m+1 This represents the timestamp corresponding to the rising edge of the (m+1)th pulse; T m This represents the timestamp corresponding to the rising edge of the m-th pulse.

7. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 6, characterized in that, In S3, the difference ΔW between the standard increase in electrical energy between the m-th timestamp and the (m+1)-th timestamp and the increase in electrical energy of the smart measuring switch under test is... m The expression is: ΔW m =WS m -W m 。 8. The intelligent measurement switch calibration method based on energy quantization ladder characteristics according to claim 1, characterized in that, Also includes: Adjust the standard current I within the preset calibration current range, and repeat S1~S4 until all calibration current values ​​are traversed. Or / and, adjust the standard voltage U within the preset calibration voltage range, and repeat S1~S4 until all calibration voltage values ​​are traversed.

9. A smart measurement switch calibration system based on the energy quantization ladder characteristic, characterized in that, It uses the intelligent measurement switch calibration method based on the energy quantization ladder feature as described in any one of claims 1-8; The intelligent measurement switch calibration system based on the energy quantization ladder feature includes: The power application module is used to: adjust the standard source to a standard voltage U and a standard current I, and apply them synchronously to the intelligent measuring switch under test; The data monitoring module is used to: examine whether the standard source outputs stable electrical energy; if the standard source outputs stable electrical energy, it captures the rising edge of each pulse output by the intelligent measuring switch under test in real time and records its corresponding timestamp and the electrical energy of the measuring switch; and The data calibration module is used to: calculate the increase in electrical energy of the tested smart measuring switch between two adjacent time stamps; calculate the standard increase in electrical energy between two adjacent time stamps based on the standard voltage U and the standard current I; calculate the difference between the standard increase in electrical energy between two adjacent time stamps and the increase in electrical energy of the tested smart measuring switch, and use it as the corresponding error value for calibration.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the intelligent measurement switch calibration method based on the energy quantization ladder characteristics as described in any one of claims 1-8.

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