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The method of reducing the co -mode voltage and the method of the driver based on the current source converter

A common-mode voltage, converter technology, applied in the field of common-mode voltage reduction equipment and drivers based on current source converters, can solve the problems of current source converters without DC link, ineffective common mode voltage, etc.

Active Publication Date: 2011-12-21
ROCKWELL AUTOMATION TECH
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Problems solved by technology

However, current source converters do not have a DC link with a fixed voltage, and common-mode control techniques used in voltage source converters are not effective for dealing with common-mode voltages in current source converters

Method used

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  • The method of reducing the co -mode voltage and the method of the driver based on the current source converter
  • The method of reducing the co -mode voltage and the method of the driver based on the current source converter
  • The method of reducing the co -mode voltage and the method of the driver based on the current source converter

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Embodiment Construction

[0019] Referring now to the drawings, several embodiments or implementations are described below in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout, and wherein various features are not necessarily drawn to scale.

[0020] figure 1An exemplary power conversion system 100 is illustrated having a motor drive 110 of the current source converter (CSC) type driving a motor load 120 . System 100 includes an exemplary three-phase AC voltage source 111 that provides input power to driver 110 , and driver 110 converts the input power to drive a motor load 120 coupled to converter output 114 . The driver 110 is of the current source converter (CSC) type, the input 112 of which is connected to an AC power source 111 . While these examples are illustrated with a three-phase input 112, other embodiments may provide a single-phase AC input, or may include multi-phase inputs adapted to receive three or more input phases.

[0021]...

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Abstract

Current source converter drives and common mode voltage reduction techniques are presented in which a space vector modulation zero vector for current source inverter (or rectifier) control is selected according to the switching state of the current source rectifier (or inverter) and according to the AC input power and the AC output power to control the output common mode voltage.

Description

Background technique [0001] Motor drives and other forms of power conversion systems convert power from one form to another and can be used in a variety of applications, such as powering electric motors using power converted from single-phase or multi-phase AC input sources. Such power converters are typically constructed by using an active rectifier to convert the incoming AC power to an intermediate DC, followed by an active inverter stage which converts the intermediate DC AC output power to drive motors, power grids or other loads. Rectifiers and inverters include switches actuated by various forms of pulse width modulation (PWM), where rectifiers and inverters can be constructed according to Selective Harmonic Elimination (SHE) or Space Vector Modulation (SVM) or other PWM techniques The state of the PWM switch used in the converter. A current source converter (CSC) type of drive uses a rectifier to provide a controlled DC current in an intermediate DC link circuit, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02M5/44H02M7/12H02M7/48
CPCH02M1/44H02M2001/123H02M5/4585H02M1/123
Inventor 程仲元纳维德·扎尔加里肖原
Owner ROCKWELL AUTOMATION TECH
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