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Low frequency interharmonic passive power filter for single-tuned power network

A technology of power filters and power capacitors, applied in AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as voltage fluctuations

Active Publication Date: 2017-04-12
上海坤友电气有限公司
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a single-tuned power network low-frequency inter-harmonic passive power filter, which mainly solves the power quality problems of voltage fluctuation and flicker caused by low-frequency inter-harmonics of the existing power network

Method used

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  • Low frequency interharmonic passive power filter for single-tuned power network
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  • Low frequency interharmonic passive power filter for single-tuned power network

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Embodiment Construction

[0014] figure 1 , which is a schematic diagram of the principle of the single-tuned power network low-frequency inter-harmonic passive power filter of the present invention. It has three high-voltage equivalent low-frequency power capacitors 1. The equivalent low-frequency power capacitors 1 are installed with a capacitor cabinet 6. The capacitor cabinet has three-phase lead-in cables 2 connected to the power grid, which are respectively connected to the three-phase power supplies A, B, and C of the power grid. The three-phase wiring 3 is respectively connected to the high-voltage equivalent low-frequency power inductor 4; three high-voltage equivalent low-frequency power inductors 4, the power inductor 4 is installed by the electrical cabinet 7, and the power inductor cabinet has a lead-out cable connected to the neutral line 5.

[0015] figure 2 , the equivalent capacitance value of the three high-voltage equivalent low-frequency power capacitors is determined according t...

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Abstract

The invention relates to a power grid inter-harmonic passive power filter, in particular to a single-tuning power grid low-frequency inter-harmonic passive power filter. The single-tuning power grid low-frequency inter-harmonic passive power filter is composed of a low-frequency power inductor and a low-frequency power capacitor. The power inductor and the power capacitor are connected to a circuit in series. The power filter is installed in a dual-electric-cabinet mode. The dual electric cabinets are a power inductor cabinet and a power capacitor cabinet. The power capacitor cabinet is provided with a lead-in cable connected with a medium-voltage power grid. The power capacitor cabinet is provided with a lead-out cable connected with a neutral line. The single-tuning power grid low-frequency inter-harmonic passive power filter is mainly used for eliminating and reducing the voltage flickering phenomenon and the voltage fluctuation fault phenomenon caused by existing power grid low-frequency inter-harmonics, the damage, caused by power grid voltage low-frequency flicker, to in-network electrical devices and vision of electricity workers is avoided, and the quite effective role in solving the electric energy quality problem caused by the power grid low-frequency inter-harmonics is played.

Description

technical field [0001] The invention relates to a three-phase power network inter-harmonic passive power filter, in particular to a single-tuned power network low-frequency inter-harmonic passive power filter. Background technique [0002] Existing passive power filters can only filter harmonics whose frequency is an integral multiple of the power frequency, and inter-harmonics, that is, harmonics whose frequency is not an integral multiple of the power frequency, especially low-frequency inter-harmonics. filtering effect. However, as power electronic equipment, such as various converters, especially various AC-DC-AC speed regulation systems operating in four quadrants are widely used in power grids, especially the application of various high-power speed regulation systems, these devices generate A large number of interharmonics are injected into the power grid, causing voltage fluctuations and flicker in the power grid, seriously affecting the safe operation of power equip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 杨文焕薛新明张建颖
Owner 上海坤友电气有限公司
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