Accurate algorithm for correcting electric quantity and power factor under three-phase three-wire electric-energy-meter false wiring

A three-phase three-wire, mis-wiring technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve problems such as large error in correction coefficient, large error in correct active power and correct power, and error in calculation results.

Inactive Publication Date: 2017-04-19
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, th

Method used

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  • Accurate algorithm for correcting electric quantity and power factor under three-phase three-wire electric-energy-meter false wiring
  • Accurate algorithm for correcting electric quantity and power factor under three-phase three-wire electric-energy-meter false wiring
  • Accurate algorithm for correcting electric quantity and power factor under three-phase three-wire electric-energy-meter false wiring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: The wrong connection form is: voltage phase sequence W, U, V, and the current access method is Loads are known to be inductive. After the smart watt-hour meter has been running for a period of time, the power is read as follows: the total forward active power is 38kWh, the reactive power I (reactive power in quadrant I) is 39kvarh, and the power seen in other displays is zero.

[0038] (1) by the precise calculation method of the present invention, calculate as follows:

[0039] The power represented by the energy meter under this wrong wiring is:

[0040]

[0041]

[0042] In the case of symmetrical load, according to the quadrant diagram, the following formula can be obtained:

[0043]

[0044]

[0045]

[0046] Combine formulas ① and ② to get:

[0047]

[0048]

[0049] but:

[0050]

[0051] Converted into electric quantity can get:

[0052]

[0053]

[0054] Substitute the copied electric quantity into the formulas ③...

Embodiment 2

[0081] The connection 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 positive active power is 55kWh, and the reactive power in quadrant I is 14kvarh.

[0082]

[0083]

[0084]

[0085] W Q0 It is a negative value, indicating that it is capacitive reactive power, which is consistent with the actual situation.

[0086] Explain that this algorithm is applicable when the load is capacitive or inductive.

[0087] The actual power value and average power factor under various miswiring conditions are shown in Table 1 below:

[0088] Table 1

[0089]

[0090]

[0091]

[0092] For the active power under miswiring, see the electric quantity W PX =Total forward active energy -total reverse active energy.

[0093] Reactive power under miswiring see Electricity: W QX =W QXⅠ +W QXⅡ -W QXⅢ -W QXⅣ .

[0094] Average weighted power factor:

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PUM

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Abstract

The invention discloses an accurate algorithm for correcting an electric quantity and a power factor under three-phase three-wire electric-energy-meter false wiring and belongs to the power supply technology field. Through analyzing an inner link of an active electric quantity WPX, a reactive electric quantity WQX and expressions of a correct active electric quantity WP0 and a reactive electric quantity WQ0 under false wiring, the correct active electric quantity WP0 and the reactive electric quantity WQ0 are calculated and an actual monthly-average power factor of a load is determined. Through the power factor, a correct active electric quantity and a corrected electric quantity can be accurately calculated. Under the condition of intelligent electric-energy-meter false wiring, a great guiding significance is possessed to work of electric charge recovery. And a blank of an accurate electric quantity correcting calculation method under the three-phase three-wire intelligent electric-energy-meter false wiring in practical work is filled.

Description

technical field [0001] The technical problem to be solved by the present invention is to provide an accurate algorithm for correcting electric quantity and power factor under miswiring of a three-phase three-wire electric energy meter, which belongs to the technical field of electric power supply. Background technique [0002] At present, when the three-phase three-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 calculate the active and reactive power copied under the wrong connection. It can be concluded that, however, the numerical error of the corrected electricity calculated by these methods is large and not rigorous, especially for power adjustment users, because the value of the power factor involves the calculation of electricity bills, resulting in a larger error in the calculation results of the user's...

Claims

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Application Information

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IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 霍秀平马玥刘璐
Owner STATE GRID CORP OF CHINA
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