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Adaptive fharmonic reduction apparatus and methods

An input filter and rectifier technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, conversion equipment for intermediate conversion to DC conversion, etc., and can solve the problem of expensive input filter circuits.

Active Publication Date: 2014-12-10
ROCKWELL AUTOMATION TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these techniques have thus far provided only limited success in controlling total harmonic distortion (THD), and input filter circuits are expensive

Method used

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  • Adaptive fharmonic reduction apparatus and methods
  • Adaptive fharmonic reduction apparatus and methods
  • Adaptive fharmonic reduction apparatus and methods

Examples

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Embodiment Construction

[0018] Several embodiments or implementations are described below in conjunction with the accompanying drawings, wherein like reference numerals are used to refer to like elements throughout, and wherein various structural elements are not necessarily drawn to scale.

[0019] A power converter along with a rectifier SHE control system and method is disclosed, wherein the firing angle or switching angle is calculated in real time, or is predetermined and stored in a table for selection based on harmonic conditions at the converter input. The PWM switching control of the rectifier is performed in a manner that provides selective cancellation or reduction of one or more specific harmonics, and also controls total harmonic distortion (THD) in the harmonic range of interest, where these targets are tailored to Specific source harmonic conditions. These aspects alone or in combination provide significant improvements over conventional pulse width control techniques, especially in co...

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Abstract

Power conversion systems with active front end converters for example motor drives and power generation systems for distributed energy sources are presented with adaptive harmonic minimization for grid-tie converters for minimized or reduced total harmonic distortion in the line current spectrum including the source harmonic current and the grid-tie converter injected current spectrum referred to the line side.

Description

technical field [0001] The present invention relates to an adaptive harmonic reduction device and method. Background technique [0002] Motor drives and other forms of power conversion systems convert electrical power from one form to another and can be employed in a variety of applications, such as using power converted from single-phase or multi-phase alternating current (AC) input sources as Electric motors provide power, convert AC power from wind driven generators to supply power to the grid, etc. Power converters may include multiple stages for different types of conversion applications, such as AC / DC / AC drives for electric motors with active current source rectifiers after pulse width modulation (PWM), in the rectifier , selectively switching the AC input power to create a DC output bus voltage from which the load is driven through a PWM-controlled inverter stage. Such converters are particularly useful in drive motors in industrial applications with varying motor l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/40H02M5/44H02M1/12
CPCH02P27/04H02M5/4585Y02E40/40H02J3/01
Inventor 纳维德·扎尔加里程仲元肖原
Owner ROCKWELL AUTOMATION TECH
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