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Method for accurately calculating corrected electric quantity under wrong wiring of three-phase four-wire intelligent electric energy meter

A smart electric energy meter, wrong wiring technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve the problems of large errors in correct active power and corrected power, large errors in correction coefficients, and errors in calculation results, etc., to achieve correct active power and correcting the effect of accurate and huge guidance

Inactive Publication Date: 2016-06-29
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual work, the power factor is usually set in advance, or calculated with reference to the previous normal monthly value. This calculation method can only be an estimation method, and the error of the correction coefficient obtained is relatively large. Therefore, the correct active power and Corrected power error is also large
Especially for power adjustment users, since the value of power factor involves the calculation of electricity bills, the error in the calculation results of the user's recovery of electricity bills is greater

Method used

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  • Method for accurately calculating corrected electric quantity under wrong wiring of three-phase four-wire intelligent electric energy meter
  • Method for accurately calculating corrected electric quantity under wrong wiring of three-phase four-wire intelligent electric energy meter
  • Method for accurately calculating corrected electric quantity under wrong wiring of three-phase four-wire intelligent electric energy meter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The wrong connection form is: voltage phase sequence U, V, W, and the current access method is , , , the load is known to be inductive. After the smart watt-hour meter has been running for a period of time, the power is read: the total reverse active power is 8.70kWh, the reactive power Ⅲ (reactive power in the Ⅲ quadrant) is 29.50kVarh, and the power shown in other displays is zero.

[0024] (1) According to the precise calculation method of the present invention, the calculation is as follows:

[0025] The power represented by the energy meter under this wrong wiring is:

[0026]

[0027]

[0028] Under symmetrical load

[0029]

[0030]

[0031]

[0032] ①

[0033]

[0034]

[0035] ②

[0036] Combine formulas ① and ② to get:

[0037]

[0038] but:

[0039]

[0040] Converted into electric quantity can get: ③

[0041] ④

[0042] Substitute the copied power into the formulas ③ and ④ (note that the reverse ...

Embodiment 2

[0065] The wiring form is the same as that of Example 1. The load is known to be capacitive. After running for a period of time, you can see the power: the reverse active power is 8.00kWh, the reactive power in the III quadrant is 5.40kVarh,

[0066]

[0067]

[0068]

[0069] W Q0 It is a negative value, indicating that it is capacitive reactive power, which is consistent with the actual situation.

[0070] The actual power value and average power factor (when the voltage phase sequence is U, V, W) under various wrong wiring conditions are shown in Table 1.

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

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PUM

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Abstract

The invention discloses a method for accurately calculating a corrected electric quantity under wrong wiring of a three-phase four-wire intelligent electric energy meter. The method comprises the following steps: a step of obtaining error active power PX and error reactive power QX under the wrong wiring, and a reading active electric quantity WPX and a reading reactive electric quantity WQX under the wrong wiring; a step of solving UIcos phi and UIsin phi; a step of solving correct active power P0 and correct reactive power Q0; a step of solving an actual correct active electric quantity WP0 and a correct reactive electric quantity WP0; a step of calculating an actual power factor cos phi; and a step of calculating a compensation electric quantity. The method provided by the invention has the following advantages: the obtained correct active electric quantity and the corrected electric quantity are more accurate, and the method has great guidance significance for work of pursing electricity payment from users under the condition of wrong wiring of the intelligent electric energy meter and fills the blank of a method for accurately calculating a corrected electric quantity under wrong wiring of a three-phase four-wire intelligent electric energy meter in actual work.

Description

technical field [0001] The invention belongs to the technical field of electric power supply, and relates to an accurate calculation method for correcting electric quantity of a three-phase four-wire intelligent electric energy meter under wrong wiring. Background technique [0002] At present, when the three-phase four-wire smart energy meter is wrongly connected, the calculation of the corrected power is mostly set in advance with the power factor, or calculated with reference to the previous normal monthly value, and some simply use the active and reactive power copied under the wrong connection However, the numerical error of the corrected electricity calculated by these methods is relatively large, and it is not rigorous, especially for power adjustment users, because the value of the power factor involves the calculation of electricity bills, the error in the calculation results of the user's recovery of electricity bills is even greater. Therefore, in practical work, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 霍秀平赵巍然刘璐张媛
Owner STATE GRID CORP OF CHINA