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A method for suppressing non-characteristic harmonic resonance

A non-characteristic and harmonic technology, applied in the field of power transmission, can solve problems such as high power loss, achieve the effects of reducing power loss, realizing economical operation, and reducing resistance heating

Inactive Publication Date: 2022-03-08
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a high-pass damping filter and method for suppressing non-characteristic harmonic resonance, which solves the problem that the existing high-pass damping filter suppresses non-characteristic harmonic resonance and easily causes relatively large power loss problem

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  • A method for suppressing non-characteristic harmonic resonance

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Embodiment Construction

[0060] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0061] Such as figure 1 As shown, the high-pass damping filter for suppressing non-characteristic harmonic resonance includes a capacitor C1, one end of the capacitor C1 is used as the interface end of the high-pass damping filter, and the other end of the capacitor C1 is respectively connected to one end of the inductor L2 through the inductor L1 and one end of the switch K; the other end of the switch K is connected to on...

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Abstract

The invention discloses a high-pass damping filter and a method for suppressing non-characteristic harmonic resonance. The high-pass damping filter includes a capacitor C1, one end of the capacitor C1 serves as an interface end of the high-pass damping filter, and the other end of the capacitor C1 One end of the inductor L2 is connected to one end of the switch K through the inductor L1; the other end of the switch K is connected to one end of the resistor R through the capacitor C2; the other end of the resistor R is connected to the other end of the inductor L2 and grounded. The high-pass damping filter in the present invention can simultaneously suppress characteristic and non-characteristic sub-harmonic resonances, and the power loss of the high-pass damping filter can be reduced by controlling the on-off of the switch K. In some system conditions, disconnecting the switch K can avoid the long-term operation of the damping branch, thereby reducing the resistance heating, improving the life of the equipment, and realizing the economical operation of the substation.

Description

technical field [0001] The invention relates to the field of power transmission, in particular to a high-pass damping filter and method for suppressing non-characteristic harmonic resonance. Background technique [0002] A converter station refers to a station established in a high-voltage direct current transmission system to complete the conversion of alternating current to direct current or direct current to alternating current, and to meet the requirements of the power system for safety, stability and power quality. HVDC transmission has been widely used in grid interconnection because of its superior performance in long-distance large-capacity power transmission. However, the inherent nonlinear characteristics of the converter make it generate a large number of harmonics. For example, a 12-pulse converter generates a large number of 12k±1 harmonics, which are also called characteristic harmonics, and the remaining harmonics are non-characteristic harmonics. Most conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 刘可车克杉赵金朝王轩
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY
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