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Active Power Filter

A power filter and inductor technology, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve problems such as self-damage, active power filter can no longer be controlled, equipment damage, etc.

Active Publication Date: 2017-09-15
SHANGHAI ELECON INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the active power filter is powered by the grid, if there is a sudden power failure of the grid, misoperation or other load faults, the active power filter will be disconnected from the grid, which may make the active power filter unable to continue to receive power. control, and even output short-term messy signals to the grid, which may cause self-damage and damage to other user equipment in the grid

Method used

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Embodiment Construction

[0031] Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0032] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0033] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without certain of the specific details. In some instances, methods, means, components and circuits well kn...

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Abstract

The invention discloses an active power filter comprising a rectification and energy storage module which is connected with a power grid and used to rectify alternating-current power from the power grid into direct-current power and store the direct-current power, a switching power supply which is connected with the rectification and energy storage module and used to transform the voltage of the direct-current power from the rectification and energy storage module to obtain a control voltage, a control module which is connected with the switching power supply and used to send a driving signal when the switching power supply supplies power to the control voltage, and a harmonic elimination module which is connected with the control module and used to output a harmonic elimination signal to the power grid according to the driving signal. The active power filter of the invention can still perform judging and processing correctly and is not out of control when external power supply is abnormal, and the active power filter and other equipment on the power grid can be effectively protected from damage.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an active power filter. Background technique [0002] With the rapid development and wide application of power electronics technology, electric energy has been more fully utilized. However, non-linear power electronic devices such as rectifiers, frequency converters, computers, etc. distort the voltage and current of the grid and generate power harmonics. Moreover, with the increase in the number of nonlinear devices and their capacity, the problem of harmonic pollution in the power system is becoming more and more widespread, which seriously affects the quality of electric energy and has a great impact on the safe and economical operation of the power system. [0003] In order to improve the quality of electric energy and the quality of the distribution network, a common method is to use a harmonic suppression device such as an active power filter (English: Active power filter,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 徐瑞新王龙赵晓娜
Owner SHANGHAI ELECON INTELLIGENT TECH CO LTD
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