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Method and apparatus for controlling a power converter with an inverter output filter

A technology of power conversion and inverter, which is applied in the direction of output power conversion device, irreversible DC power input to AC power output, control system, etc., which can solve the problems of increasing system cost and so on.

Active Publication Date: 2017-04-12
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Feedback sensors can be placed at the load itself for direct measurement of load parameters, but this adds to system cost and may not be possible in all applications

Method used

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  • Method and apparatus for controlling a power converter with an inverter output filter
  • Method and apparatus for controlling a power converter with an inverter output filter
  • Method and apparatus for controlling a power converter with an inverter output filter

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Embodiment Construction

[0017] Referring now to the drawings, several embodiments or implementations are hereinafter described in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout, and wherein the various features are not necessarily drawn to scale.

[0018] A power converter and method for controlling a connected load through an intermediate filtering circuit is disclosed by which improved control can be facilitated without the need for adding additional feedback sensors or extensively modifying the inverter Output control scheme. In the following, the concepts are illustrated in the context of a motor-driven power converter controlling an AC permanent magnet synchronous motor (PMSM), however the invention is not limited to motor-drive type power converters nor to PMSM-type loads. The described implementation utilizes only measurements of the inverter output current (no direct sensing of voltage and / or current at the drive motor load is requ...

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PUM

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Abstract

A power converter and method are presented for driving a connected AC load through an intermediate filter circuit, wherein at least one filter current is determined from a feedback signal or value representing an output parameter at an AC output of the power converter or voltage signal or value, and generate AC output power at the AC output based at least in part on the at least one filter current or voltage signal or value.

Description

Background technique [0001] A power conversion system is used to generate alternating current (AC) output power and provide it to a load, such as a single-phase or multi-phase AC motor driven by an inverter stage of a motor-driven power converter. Pulse width modulated (PWM) output inverters provide output current and voltage consisting of many pulses and sometimes employ an output filter between the power converter and the load being driven to reduce the high frequency content caused by the pulse width modulation. However, the presence of an output filter between the power conversion system and the load makes it more difficult to precisely control the voltage and / or current supplied to the load because the power delivered to the load differs from the power delivered to the input of the filter. In particular, the output inverter stages may be controlled based on feedback signals measured at the inverter output, and these feedback values ​​may not be representative of the curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02P27/06
CPCH02M1/126H02P21/0003H02P21/06H02P23/28H02M7/44
Inventor 刘晶波托马斯·诺德哈尔彼得·舒米特谢苗·罗亚克
Owner ROCKWELL AUTOMATION TECH