Method for improving electric energy measuring precision

Abstract

The invention discloses a method for improving the electric energy measuring and sampling precision. The method comprises the following steps that multi-periodic-wave sampling is conducted on alternating-current voltage and current signals, sampling values are accumulated to acquire an average value, fast Fourier transform (FFT) is conducted according to the sampling average value, a real part value and an imaginary part value of a voltage phasor and a real part value and an imaginary part value of a current phasor are calculated, the square of the real part value of the voltage phasor and the square of the imaginary part value of the voltage phasor are added, the square of the real part value of the current phasor and the square of the imaginary part value of the current phasor are added, software gain multiple amplification and extraction are conducted to obtain a Um value and an Im value, 4<n+2> Um values and 4<n+2> Im values are continuously sampled and then subjected to bubble sorting from large to small to acquire 4<n> values, the 4<n> values are accumulated and then shifted rightwards by n bits, a M-bit oversampling value is obtained, and then the ADC sampling resolution ratio precision is improved. According to the method, an expensive ADC does not need to be adopted, the hardware cost is low, and the ADC sampling resolution ratio bit number can be increased; the anti-disturbance performance of the system is high, and the measuring precision is high; the method is easy to achieve, accurate and reliable in data and capable of meeting the requirements of an industrial electric energy meter.

Description

technical field [0001] The invention belongs to the technical field of electric power, and more specifically relates to a method for improving the accuracy of electric energy measurement. Background technique [0002] In the field of power industry, in order to meet the industry’s error standards, many equipment products often use high-digit off-chip or on-chip ADCs to sample and convert voltage, current and other signals. Expensive ADC chips increase product costs and do not improve signal-to-noise Ratio and quantization error. At present, some methods commonly used in the industry have poor measurement results, and cannot increase measurement accuracy and quantization error. Contents of the invention [0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for improving the accuracy of electric energy measurement, aiming at solving the problem of low measurement accuracy and large quantization error in the prior art by...

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Problems solved by technology

[0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for improving the accuracy of electric energy measurement, aiming at solving the problem of low measurement accuracy and large quantization error in the prior art by using the voltage and current of the AC signal to measure the ADC question

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