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Cascaded filter and fundamental wave extraction method thereof

An extraction method and filter technology, applied in the direction of impedance network, digital technology network, electrical components, etc., can solve the problems of large metering chip area, increased calculation amount, and low efficiency of fundamental wave extraction, so as to reduce the area and improve The effect of extraction efficiency

Pending Publication Date: 2022-04-22
SPL ELECTRONICS TECH CO LTD
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Problems solved by technology

[0005] The purpose of this application is to provide a fundamental wave extraction method of a cascaded filter to solve the problem of low extraction efficiency of the fundamental wave of the existing cascaded filter when the value of M is large; in addition, this application also provides a A cascaded filter is used to solve the problem that the calculation amount of the existing cascaded filter increases when the value of M is large, resulting in a large metering chip area

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  • Cascaded filter and fundamental wave extraction method thereof
  • Cascaded filter and fundamental wave extraction method thereof
  • Cascaded filter and fundamental wave extraction method thereof

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Embodiment Construction

[0047] Cascaded Filter Example:

[0048] The main idea of ​​the present invention is that based on the fact that both the existing shaping filter and the masking filter use FIR filters, when the value of M is large, the amount of calculation is large and the area of ​​the metering chip is large. The present invention is based on the M in the recursive filter The principle that the change of the value does not affect the amount of calculation, the masking filter adopts a recursive filter, so that the area of ​​the metering chip can be reduced when the value of M increases.

[0049] Cascaded filters such as figure 1 As shown, according to the direction of signal transmission, a shaping filter, a masking filter, an enhancement attenuation filter, and a compensation filter are arranged in sequence, and the cascade filter is used to realize the function of low-pass filtering and complete the extraction of the fundamental component.

[0050] The shaping filter is an FIR filter, and...

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Abstract

The invention relates to a cascade filter and a fundamental wave extraction method thereof, and belongs to the technical field of digital signal processing. The method comprises the following steps: determining an initial value of an interpolation factor M; substituting the interpolation factor into a cascade filter to obtain a filtering result corresponding to the initial value; the cascade filter comprises a shaping filter and a masking filter, the shaping filter is an FIR filter, and the shaping filter is obtained by interpolating M-1 zeros between adjacent pulse response coefficients of a prototype filter; the masking filter is a recursive filter; adjusting the sizes of the interpolation factors, comparing filtering results corresponding to different interpolation factors, and taking the value of the interpolation factor with the best filtering result as the final value of the interpolation factor; and the cascade filter performs fundamental wave extraction according to the final value of the interpolation factor. According to the invention, the increase of the M value does not affect the calculation amount of the recursive filter and further does not affect the calculation amount of the whole cascade filter, so that the extraction efficiency of the fundamental wave is improved under the condition that the M value is relatively large.

Description

technical field [0001] The invention relates to a cascaded filter and a fundamental wave extraction method thereof, belonging to the technical field of digital signal processing. Background technique [0002] The task of electric energy metering is to accurately accumulate the instantaneous power of users into energy, and provide a basis for power settlement between power generation companies, grid companies, and power users. Its accuracy directly affects the interests of the three and the rationality of transactions. Electric energy metering is divided into two types: full-wave electric energy metering and harmonic electric energy metering. Full-wave electric energy metering directly calculates the total electric energy, mainly using the electric energy integration algorithm; Among them, the fundamental wave electric energy is calculated by extracting the fundamental wave component in the full wave data through the fundamental wave low-pass filter, and the harmonic electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/0283
Inventor 吴义文黎永望陈飞飞黄梅莹孙胤杰楼红伟李正卫郭昌松
Owner SPL ELECTRONICS TECH CO LTD
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