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Error compensation method of active powers and reactive powers

A technology of active power and error compensation, applied in the field of AC circuit parameter measurement, it can solve the problems of lack of common mode noise offset error, difficult to calculate and set phase correction parameters or proportional correction parameters accurately, so as to improve the compensation accuracy and the correction parameters. accurate effect

Active Publication Date: 2013-01-02
XUJI GRP +3
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Problems solved by technology

[0003] The purpose of the present invention is to provide an error compensation method of active power and reactive power to solve the difficulty in accurate calculation and setting of phase correction parameters or proportional correction parameters and the lack of Compensation of Offset Error Caused by Common Mode Noise

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  • Error compensation method of active powers and reactive powers
  • Error compensation method of active powers and reactive powers
  • Error compensation method of active powers and reactive powers

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Embodiment Construction

[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] The principle block diagram of the error compensation method of active power and reactive power of the present invention is as follows figure 2 As shown, the specific process of the present invention is described in detail by taking the active power and reactive power of a pair of pure sinusoidal voltage and current signals with a frequency of 50 Hz as an example. Sampling frequency is 4kHz, utilize error compensation method of the present invention to average active power P I and average reactive power Q I Perform error compensation processing, the specific steps are as follows:

[0024] 1. Obtain the average active power P by calculating with the same calculation delay and averaging over 400 sampling points I and average reactive power Q I ,

[0025] 2. The input average active power P I Subtract active power offset error set...

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Abstract

The invention relates to an error compensation method of active powers and reactive powers, belonging to the technical field of alternating circuit (AC) parameter measurement. The error compensation method comprises the following steps: performing average computation on sampled active powers and sampled reactive powers to obtain average active power and average reactive power; and performing offset error compensation, proportional error compensation and angle error compensation on the average active power and the average reactive power to obtain final active power output and final reactive power output. An active power offset error setting value, a reactive offset error setting value, a proportional error adjustment coefficient and an angle error adjustment coefficient are obtained by direct correction computation, so that each correction parameter can be computed and set accurately, offset errors caused by common-mode noises are compensated, and the compensation accuracy is high.

Description

technical field [0001] The invention relates to an error compensation method for active power and reactive power, belonging to the technical field of AC circuit parameter measurement. Background technique [0002] The voltage divider circuit, the ratio error of the current transformer and the phase shift error of the current transformer are the main errors in power and electric energy measurement, which directly affect the accuracy of the measurement results. Therefore, these system errors must be compensated in power measurement and energy metering to ensure the accuracy of measurement. According to the user manual of ATT7022A and ATT7022B, the high-precision multi-functional three-phase electric energy dedicated metering chips designed by Actions Integrated Circuit Design Co., Ltd., the existing active and reactive error compensation methods are as follows: figure 1 shown. Phase correction is set to adjust the instantaneous phase of the current through filtering after th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R21/00
Inventor 张长江庞浩黄明山
Owner XUJI GRP
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