Electricity meter demand measurement method

Abstract

The present invention relates to a demand metering method for an electric energy meter. The method comprises the following steps: firstly executing a first preset demand metering mode after the electric energy meter is powered on, and calculating a pulse period under a user's electricity consumption; once the calculated pulse period does not exceed a preset period value, the electric energy meter is switched from the first preset demand metering mode to a second preset demand metering mode; and when the obtained pulse period exceeds the preset period value, detecting whether the user's electricity consumption state is in a rapidly changing state; and once detecting that the user's electricity consumption is in a rapidly changing state, the electric energy meter is switched from the currently executed first preset demand metering mode to the second preset demand metering mode, thereby enabling the electric energy meter to adaptively adjust the demand metering mode according to the length of the obtained pulse period and whether the user's electricity consumption is in a rapidly changing state, which is more in line with actual metering scenarios, realizes intelligent metering of demand metering for user electricity consumption, and improves metering accuracy.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and in particular to a method for measuring demand of an electric energy meter. Background Art

[0002] In the electric power sector, demand refers to the average power over a period of time, measuring the amount of electricity a user requires over that period. Maximum demand refers to the maximum amount of power generated over a period of time (usually one month). Maximum demand is categorized as forward active power maximum demand, reverse active power maximum demand, first quadrant reactive power maximum demand, second quadrant reactive power maximum demand, third quadrant reactive power maximum demand, and fourth quadrant reactive power maximum demand.

[0003] In order to ensure the safety of electricity use and the reasonable capacity configuration of users, the power management department will use the user's maximum demand as an indicator to evaluate the user's electricity use in order to facilitate electricity metering management.

[0004] Existing energy meter demand measurement methods typically use either energy-based or power-based demand measurement. Energy-based demand measurement divides the total number of energy pulses accumulated during a demand period by the demand period. Power-based demand measurement takes measurements at fixed intervals (e.g., 1 second) during the demand period, accumulates the power values ​​at these points, and then divides the total by the demand period.

[0005] However, the two existing energy meter demand measurement methods mentioned above also have shortcomings:

[0006] First, the demand metering method based on electric energy is suitable for electric energy meters with large current or large pulse constant, but it is not suitable for electric energy meters with small current specifications and small pulse numbers. Since electric energy meters with small current specifications and small pulse numbers take a long time to generate energy for one pulse, for example, assuming the demand cycle is 15 minutes, and 5 pulses are recorded in one demand cycle, part of the electricity in the first pulse was generated in the previous demand cycle, and there may be part of the electricity (less than 1 pulse) in the current demand cycle, even if it does not form a complete pulse, it is included in the next demand cycle. Because the current is changing in real time, the energy that is over-counted in the early part of the current demand cycle and the energy that is under-counted in the latter part of the demand cycle are not equal, resulting in inaccurate demand metering;

[0007] Secondly, power-based demand metering is suitable for stable power consumption. However, if a user's power consumption fluctuates significantly over a short period of time, or even experiences sharp fluctuations in power consumption, the calculated demand will be inaccurate. For example, if a fixed cycle interval is 1 second, one power data point is accumulated every second, and the accumulated power value is then divided by the demand cycle to calculate the demand. However, if power consumption fluctuates sharply, the power value collected at the 1-second interval will not accurately represent the actual power situation in that second, resulting in inaccurate demand metering. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a method for measuring the demand of electric energy meters that is widely applicable and accurate in measurement in view of the above-mentioned prior art.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: an electric energy meter demand measurement method, characterized by comprising the following steps:

[0010] Step 1: The electric energy meter performs demand metering on the user's electricity consumption using a first preset demand metering method;

[0011] Step 2: Calculate the pulse period generated by the electric energy meter under the preset conditions corresponding to the user's current electricity consumption;

[0012] Step 3: Process according to the calculated pulse period:

[0013] When the pulse period is less than or equal to the preset period value, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode to perform demand metering; otherwise, the process proceeds to step 4;

[0014] Step 4: The electric energy meter detects the user's electricity consumption status;

[0015] Step 5: Take action based on the user's power usage status detection results:

[0016] When the user's electricity consumption is in a state of rapid change, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode; otherwise, the electric energy meter is kept executing the first preset demand metering mode.

[0017] Furthermore, in the electric energy meter demand metering method, the first preset demand metering method is a power-based demand metering method, and the second preset demand metering method is an electric energy-based demand metering method.

[0018] Improved, in the electric energy meter demand measurement method, the preset condition in step 2 is that the electric energy meter is under the conditions of rated power and rated current.

[0019] As a further improvement, in the energy meter demand metering method, in step 5, when the user's electricity consumption is in a state of rapid change, the energy meter is switched from the first preset demand metering mode to the second preset demand metering mode at the full minute of the demand cycle.

[0020] Furthermore, in the electricity meter demand metering method, the condition for determining the rapid change state is: when the difference between the current value read last and the current value read previously in a preset number of current values ​​continuously read by the electricity meter exceeds a preset value, it is determined that the user's electricity consumption is in a rapid change state.

[0021] Preferably, in the electric energy meter demand measurement method, the preset value is 10% of the current value read the last time.

[0022] As a further improvement, in the electric energy meter demand measurement method, the electric energy meter reads the current value in a cycle of 1 second.

[0023] Further improvement, in the electric energy meter demand measurement method, the preset number is 60.

[0024] Improved, in the energy meter demand measurement method, the preset cycle value is 3 seconds.

[0025] As a further improvement, in the energy meter demand metering method, in step 5, when the user's electricity consumption is not in a state of rapid change within a continuous preset number of demand cycles, the energy meter is switched to the first preset demand metering mode.

[0026] Compared with the prior art, the advantages of the present invention are that the electric energy meter of the invention can automatically and intelligently and adaptively switch between the first preset demand metering mode and the second preset demand metering mode according to the pulse period of the user's electricity consumption and whether the user's electricity consumption is in a state of rapid change, which is more in line with the actual metering scenario of the electric energy meter, realizes intelligent metering of the demand metering of the user's electricity consumption, and improves the metering accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the flow of the method for measuring the demand of an electric energy meter in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0029] This embodiment provides a method for measuring the demand of an electric energy meter. Figure 1 As shown, the electric energy meter demand measurement method of this embodiment includes the following steps:

[0030] Step 1: The electric energy meter performs demand metering on the user's electricity consumption using a first preset demand metering method; wherein the first preset demand metering method in this embodiment is a power-based demand metering method;

[0031] Step 2: Calculate the pulse period of the electric energy meter corresponding to the user's current electricity usage under preset conditions; the preset conditions here are that the electric energy meter is under rated power and rated current conditions; the calculation formula for the pulse period T here is: T = 3600 / (3*Un*Ib*C / 1000), where Un is the rated power of the electric energy meter, Ib is the rated current of the electric energy meter, and C is the pulse constant;

[0032] Step 3: Process according to the calculated pulse period:

[0033] When the pulse period is less than or equal to the preset period value, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode to perform demand metering; otherwise, the process proceeds to step 4; wherein the preset period value in this embodiment is set to 3 seconds;

[0034] Step 4: The electric energy meter detects the user's electricity consumption status;

[0035] Step 5: Take action based on the user's power usage status detection results:

[0036] When the user's electricity consumption is in a state of rapid change, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode; otherwise, the electric energy meter is maintained in the first preset demand metering mode. In this embodiment, the second preset demand metering mode is a demand metering method based on electric energy.

[0037] Specifically, in step 5, when the user's electricity consumption is in a state of rapid change, the energy meter is switched from the first preset demand metering mode to the second preset demand metering mode at the full minute of the demand cycle, wherein the demand cycle is set to be between 1 minute and 60 minutes.

[0038] In addition, it should be noted that in this embodiment, the determination condition for a rapid change state is: if, among a preset number of current values ​​continuously read by the electric energy meter, the difference between the current value read by the electric energy meter in the last reading and the current value read by the previous reading exceeds a preset value, the user's electricity usage is determined to be in a rapid change state. For example, assuming that the electric energy meter has a current reading cycle of 1 second, and after the electric energy meter continuously reads 60 current values ​​(a preset number of 60), the difference between the current value read in the last reading and the current value read in the last reading exceeds 10% of the current value read in the last reading, then the user's electricity usage is determined to be in a rapid change state. Of course, in the above-mentioned step 5, if the user's electricity usage is not in a rapid change state within a preset number of consecutive demand cycles, the electric energy meter is switched to the first preset demand metering method, that is, the power-based demand metering method.

[0039] In the electric energy meter demand calculation method of the invention, after the electric energy meter is powered on, the first preset demand metering mode is first executed, and the electric energy meter calculates the pulse period under the user's electricity consumption. Once it is determined that the calculated pulse period does not exceed the preset period value, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode to perform demand metering. The first preset demand metering mode and the second preset demand metering mode are respectively an electric energy-based demand metering mode and a power-based demand metering mode. When the calculated pulse period exceeds the preset period value, a detection is performed to determine whether the user's electricity consumption state is in a state of rapid change. Once it is detected that the user's electricity consumption is in a state of rapid change, the electric energy meter is switched from the currently executed first preset demand metering mode to the second preset demand metering mode, so that the electric energy meter can adaptively adjust its own demand metering mode for the user's electricity consumption according to the length of the obtained pulse period and whether the user's electricity consumption is in a state of rapid change, which is more in line with the actual metering scenario, realizes intelligent metering of demand metering for user electricity consumption, and improves metering accuracy.

[0040] Although the preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. The method for measuring the demand of an electric energy meter is characterized in that: The steps include: Step 1: The electric energy meter performs demand metering on the user's electricity consumption using a first preset demand metering method; Step 2: Calculate the pulse period generated by the electric energy meter under the preset conditions corresponding to the user's current electricity consumption; Step 3: Process according to the calculated pulse period: When the pulse period is less than or equal to the preset period value, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode to perform demand metering; otherwise, the process proceeds to step 4; Step 4: The electric energy meter detects the user's electricity consumption status; Step 5: Take action based on the user's power usage status detection results: When the user's electricity consumption is in a state of rapid change, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode; otherwise, the electric energy meter is kept in the first preset demand metering mode; The first preset demand metering method is a power-based demand metering method, and the second preset demand metering method is an electric energy-based demand metering method.

2. The method for measuring electric energy demand according to claim 1, wherein: The preset condition in step 2 is that the electric energy meter is under the conditions of rated power and rated current.

3. The method for measuring electric energy demand according to claim 1, wherein: In step 5, when the user's electricity consumption is in a state of rapid change, the electric energy meter is switched from the first preset demand metering mode to the second preset demand metering mode at the full minute of the demand cycle.

4. The method for measuring electric energy demand according to any one of claims 1 to 3, characterized in that: The determination condition of the sudden change state is: when the difference between the current value read last and the current value read previously exceeds a preset value among the preset number of current values ​​continuously read by the electric energy meter, it is determined that the user's electricity consumption is in a sudden change state.

5. The method for measuring electric energy demand according to claim 4, characterized in that: The preset value is 10% of the current value read the last time.

6. The method for measuring electric energy demand according to claim 4, characterized in that: The electric energy meter reads the current value in a cycle of 1 second.

7. The method for measuring electric energy demand according to claim 4, characterized in that: The preset number is 60.

8. The method for measuring electric energy demand according to any one of claims 1 to 3, characterized in that: The preset period value is 3 seconds.

9. The method for measuring electric energy demand according to any one of claims 1 to 3, characterized in that: In step 5, when the user's electricity consumption is not in a state of rapid change within a continuous preset number of demand cycles, the electric energy meter is switched to the first preset demand measurement mode.

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