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Composite filter

A filter and composite technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of increasing filtering costs and not being able to filter harmonics, etc., to achieve a lot of cost savings and small impedance , to avoid the effect of current becoming smaller

Inactive Publication Date: 2013-06-26
西安布伦帕电力无功补偿技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the power distribution systems and power supply and distribution networks of various industrial enterprises, in order to eliminate harmonics and prevent harmonics from polluting the power quality of the system, parallel passive filters are often used to filter out harmonics, but passive The filter cannot filter out all harmonics, so a multi-branch filter device is used for harmonic filtering, which increases the cost of filtering

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The passive filter includes a filter capacitor connected in parallel with the load and a filter reactor (air core or iron core) connected in series with the filter capacitor. The active filter system includes an isolation transformer and an active filter (APF). The active filter connected to the filter reactor, the structure diagram is as follows figure 1 shown.

Embodiment 2

[0018] Embodiment 2: The passive filter includes a filter capacitor connected in parallel with the load and a filter reactor connected in series with the filter capacitor, the filter reactor is an iron core reactor, and a secondary coil is wound on the filter reactor, and the active filter (APF) is directly connected to the secondary winding of the reactor to form a composite filter, and its structure is shown in figure 2 shown.

[0019] The invention effectively combines the active filter with the passive filter, connects the active filter system to both ends of the reactor of the passive filter, and connects the low voltage and high current signals of the active filter to When connected to a high-voltage system, there is no need to convert the signal of the active filter to the high-voltage side through an isolation transformer, which is beneficial to the filtering effect; at the same time, the number of branches of the capacitor device can be reduced, which greatly reduces...

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Abstract

The invention relates to a composite filter. The composite filter comprises a passive filter and an active filter system, wherein the passive filter comprises a filter capacitor in parallel connection with loads, and a filter reactor in serial connection with the filter capacitor; and an active filter is connected with the filter reactor. By effectively combining the active filter with the passive filter, the composite filter can filter off various harmonics through one branch. The number of branches of the corresponding passive filter is reduced to one, thereby reducing the cost of associated equipment of a plurality of filter branches, and realizing the relatively good filter effect.

Description

technical field [0001] The invention belongs to the field of power supply systems, and in particular relates to a composite capacitive coupling filter for high-voltage power supply and distribution systems with a voltage above 1kv. Background technique [0002] In the power distribution systems and power supply and distribution networks of various industrial enterprises, in order to eliminate harmonics and prevent harmonics from polluting the power quality of the system, parallel passive filters are often used to filter out harmonics, but passive The filter cannot filter out all harmonics, so a multi-branch filter device is used for harmonic filtering, which increases the cost of filtering. Contents of the invention [0003] In order to better filter out the harmonics of the high-voltage power supply and distribution system, save costs and equipment costs, the invention provides a composite filter, which organically combines active filters and passive filters to realize re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王建辉邓少强胡向全李红钧
Owner 西安布伦帕电力无功补偿技术有限公司
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