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Method for accumulating aggregate capacitances of smart meter capable of realizing bidirectional metering

A total power and reverse technology, applied in the accumulation field, can solve the problems of lost power, two-way measurement error, etc., and achieve the effect of fast and accurate calibration, cost reduction, and fast calculation speed.

Active Publication Date: 2011-09-28
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0007] For example, if the current count value is 13, then 13 / 4000=0.00325kW h, the software may cut off 325 after the decimal point, thus losing this part of the power
[0008] (3) If the metering principle of the dedicated electric energy metering chip is to integrate power rather than the absolute value of power, a large threshold (set in the relevant register of the electric energy metering chip, when the integral value reaches this threshold, the energy metering chip in the electric energy metering chip DSP outputs a pulse) will bring large two-way metering error

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  • Method for accumulating aggregate capacitances of smart meter capable of realizing bidirectional metering
  • Method for accumulating aggregate capacitances of smart meter capable of realizing bidirectional metering
  • Method for accumulating aggregate capacitances of smart meter capable of realizing bidirectional metering

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[0041] This method requires that the energy register must be configured in the "read reset" mode, that is, the energy register is cleared to zero after the MCU reads the count value. This mode makes the power counting value start counting from zero again from the moment the MCU reads it, ensuring the correct bidirectional metering value.

[0042] (1) Accumulation of forward and reverse total electricity

[0043] as attached figure 2 , first judge the sign of the count value Reader read by the MCU from the energy register. The data in the register is usually in the form of two's complement code, and the negative number needs to be converted into the original code form and the sign bit is masked.

[0044] Second, divide the count value by C, the integer quotient is stored in Int, and the remainder is stored in Dec.

[0045]If Reader is a positive number, add it to the total positive power. When accumulating, the integer quotient is added to the integral part of the total po...

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Abstract

The invention provides a method for accumulating the aggregate capacitances of a smart meter capable of realizing bidirectional metering, which comprises the steps of accumulating forward and reverse aggregate capacitances, and accumulating the forward and reverse aggregate capacitances of each rate, wherein an energy register adopts a 'read / reset' mode. In the two steps above, only the integer arithmetic is used, but the digital accuracy and the accurate accumulation of aggregate capacitances can be guaranteed, and most of data processing can be completed only by using an addition or subtraction method. In case of applying the method to an MCU (micro-programmed control unit), the cost of metering devices can be reduced, and the calculation speed is faster; and the testing personnel can read the aggregate capacitance metered by an electric energy meter at any time, and compares the metered aggregate capacitance with a standard aggregate capacitance, thereby calculating a metering error. By using the method provided by the invention, the forward and reverse aggregate capacitances can be respectively accumulated according to the requirements of an electric power company, and the combined aggregate capacitance also can be calculated.

Description

technical field [0001] The invention relates to an accumulating method, in particular to a total electric quantity accumulating method of an intelligent electric meter capable of realizing two-way metering. Background technique [0002] The dedicated energy metering chip can usually judge the power flow direction in real time, and the sign of the metering value in the corresponding register will also change accordingly. Specifically, if the reference direction of active power is specified as the grid flows to the user, then when the direction of the active power is opposite to the reference direction, it is negative power, which means that the user sends electric energy back to the grid, and the measurement value in the corresponding register is negative; when the active power When the direction of is consistent with the reference direction, it is positive power, which means that the user draws electric energy from the grid, and the measurement value in the corresponding reg...

Claims

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Application Information

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IPC IPC(8): G01R11/57
Inventor 孟珺遐
Owner CHINA ELECTRIC POWER RES INST
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