Pulse width modulation control method and system for mitigating reflected wave effects in over-modulation region

A pulse width modulation and overmodulation technology, which is used in output power conversion devices, electrical components, and AC power input to DC power output. It can solve the problem of reducing polarity reversal time, increasing output current distortion, and high Problems such as motor terminal voltage

Active Publication Date: 2012-07-11
ROCKWELL AUTOMATION TECH
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Problems solved by technology

[0008] Co-pending U.S. Patent Applications Serial No. 12/394,613, filed February 27, 2009, and Serial No. 12/429,309, filed April 24, 2009, both assigned to the assignee of the present application, disclose Common-mode voltages in AC motors are controlled using switching sequences with only active vectors, but this increases output current distortion, especially at low speeds, and this method may not be easily implemented in all PWM waveform generators implement
However, when the modulation waveform of the PWM scheme exceeds the maximum value of the carrier waveform or when the

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  • Pulse width modulation control method and system for mitigating reflected wave effects in over-modulation region
  • Pulse width modulation control method and system for mitigating reflected wave effects in over-modulation region
  • Pulse width modulation control method and system for mitigating reflected wave effects in over-modulation region

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Embodiment Construction

[0039] Referring now to the figures, 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 the various features are not necessarily drawn to scale.

[0040] First refer to Figures 1A to 1E , although the disclosed concept is applicable to any form of power conversion system in which a PWM-energized inverter is used to provide multi-phase output power, the following in various exemplary cases where the multi-phase inverter 110b supplies a motor load 120 The pulse width modulation technique is shown and described in the context of a motor drive system 100 providing AC output current and voltage. In motor drives 110 and other power converters, an important design consideration is reducing or avoiding overload voltages at the motor load 120 . The inventors have realized that certain aspects of pulse width modulation in generating inverter control sign...

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Abstract

Power conversion systems and methods are provided for operating a multi-phase inverter to drive a load while mitigating reflected waves, in which one or more PWM modulating signals are selectively adjusted if at least one of the phase signals or values is transitioning into or out of an over-modulation range outside a pulse width modulation carrier waveform range.

Description

technical field [0001] The present disclosure relates to inverter pulse width modulation techniques in which the PWM modulated signal is selectively adjusted to mitigate if one or more phase signals or values ​​transition into or out of an overmodulation range outside the range of the pulse width modulated carrier reflected wave. Background technique [0002] 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 for electric motors using power converted from a single-phase or multi-phase alternating current (AC) input source Powering, converting AC power from wind turbines to supply power to transmission lines, etc. Power converters may include multiple stages for different types of conversion applications such as AC / DC (direct current) / AC drives for electric motors with pulse width modulated (PWM) active current source rectifiers, where selectively The AC input power is switche...

Claims

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Application Information

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IPC IPC(8): H02M7/5395
CPCH02M7/53875
Inventor 兰加拉詹·M·塔拉姆大卫·莱盖特
Owner ROCKWELL AUTOMATION TECH
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