C-type damping filter with selectable filtering frequencies

A technology of filters and damping resistors, which is applied in the field of electric power, can solve the problems of high investment and land occupation for multi-group configurations, and the inability of C-type damping filters to adapt to grid changes, etc., to achieve the advantages of simple operation of equipment, saving investment and land occupation Effect

Pending Publication Date: 2020-11-03
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the fixed filtering frequency of the existing C-type damping filter cannot adapt to the change of the grid structure, and the investment and land occupation of multi-group configuration is high, the present invention provides a C-type damping filter with optional filtering frequency

Method used

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  • C-type damping filter with selectable filtering frequencies
  • C-type damping filter with selectable filtering frequencies
  • C-type damping filter with selectable filtering frequencies

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Embodiment

[0020] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be a mechanical connection, an electrical connection, or a signal connection; it can be a direct connection or an indirect connection through an intermediary, which can be said to be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations. The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] refer to image 3 As shown, the C-type damping filter with optional filtering frequency provided by this embodiment mainly includes the main capacitor C 1 , damp...

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Abstract

The invention discloses a C-type damping filter with selectable filtering frequencies, and the filter comprises a main capacitor C1, a damping resistor R and more than two harmonic filtering branches,wherein the frequencies of the harmonic filtering branches are different, each harmonic filtering branch comprises a switch, and each harmonic filtering branch is connected in parallel with the damping resistor R and then is connected in series with the main capacitor C1. According to the C-type damping filter with the selectable filtering frequency, the multiple harmonic filtering branches low in manufacturing cost are additionally arranged on the low-voltage side, all the harmonic filtering branches share the main capacitor C1, the selectable characteristic frequency filtering effect is achieved through the switch, investment and occupied area of the main capacitor C1 are saved, and equipment is easy and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to a C-type damping filter with selectable filtering frequency. Background technique [0002] The C-type damping filter can not only suppress low-order harmonics, but also has high-pass filtering performance, and the fundamental active power loss is almost zero, which can effectively filter out harmonics of HVDC converter stations. Such as figure 1 As shown, the C-type filter mainly consists of two capacitors C 1 、C 2 , a reactor L, a resistor R composition. C 2 The capacitor and reactor L are connected in series and the tuning frequency is set to power frequency. Under the power frequency voltage, the voltage across the resistor is zero, which greatly reduces the loss of the resistor. C 1 and C 2 , L forms series resonance at specific harmonics, which can realize the filtering function of specific harmonics, such as 3, 5, 7, 9, 11, 13, 15 and other harmonics, the filt...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02M1/12
CPCH02J3/01H02M1/126Y02E40/40
Inventor 王立平毛炽祖熊纽周全任鑫芳
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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