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Method for acquiring capacitance and inductance of double-frequency alternating current power filter

A power filter, frequency AC technology, applied in the direction of measuring resistance/reactance/impedance, instruments, measuring electrical variables, etc., can solve the problems of inaccuracy and complicated methods of obtaining the capacitance and inductance of dual-frequency AC power filter

Inactive Publication Date: 2013-06-12
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The technical problem to be solved by the present invention is to provide a method for obtaining the capacitance and inductance of a dual-frequency AC power filter, which solves the complicated and inaccurate method for obtaining the capacitance and inductance of a dual-frequency AC power filter in the prior art question

Method used

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  • Method for acquiring capacitance and inductance of double-frequency alternating current power filter
  • Method for acquiring capacitance and inductance of double-frequency alternating current power filter
  • Method for acquiring capacitance and inductance of double-frequency alternating current power filter

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Embodiment Construction

[0043] see figure 1 , assuming the first inductance L 1 , the first capacitance C 1 , the second inductance L 2 and a second capacitor C 2 Under the condition that the internal resistance of the capacitor and reactor is known and neglected, the tuning frequency of the dual-band filter can be derived according to the following formula:

[0044] z ( ω ) = z s ( ω ) + z p ( ω ) = j ( ωL 1 - 1 ωC 1 ) - j ( ωC 2 - 1 ...

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Abstract

The invention discloses a method for acquiring capacitance and inductance of a double-frequency alternating current power filter, belonging to the field of high order harmonic filter of power. The method comprises the following steps of: calculating resonant frequency of a serial resonant circuit according to set resonant frequency, first resonant frequency and second resonant frequency of a parallel resonant circuit; and calculating first inductance, first capacitance, second inductance and second capacitance of the double-frequency alternating current power filter according to the resonant frequency of the serial resonant circuit and the resonant frequency, the first resonant frequency and the second resonant frequency of the parallel resonant circuit. According to the method, a quartic equation with multiple or one unknown is not required to be solved, only a concise expression is required to be listed according to the relation of a quadratic root with one unknown and a coefficient, and each parameter of the double-frequency filter is quickly and accurately calculated.

Description

technical field [0001] The invention belongs to the technical field of electric power high-order harmonic filtering, and in particular relates to a method for obtaining capacitance and inductance of a dual-frequency AC power filter. Background technique [0002] see figure 1 , the dual-frequency AC power filter topology provided by the prior art, the dual-frequency filter is actually composed of a series resonant circuit (L 1 , C 1 ) and parallel resonant circuit (L 2 , C 2 ) in series. Under the condition of ignoring the internal resistance of the capacitor and reactor, the impedance of the series resonant circuit is shown in formula (1): [0003] z s ( ω ) = j ( ωL 1 - 1 ω C 1 ...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 谢德华郑常桂尤海榕张华军肖激扬
Owner WISDRI ENG & RES INC LTD
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