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Multilevel converter systems and methods with reduced common mode voltage

A power conversion system, multi-level inverter technology, applied in the direction of output power conversion device, electrical components, AC power input conversion to AC power output, etc.

Active Publication Date: 2015-07-15
ROCKWELL AUTOMATION TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typical space vector modulation methods utilize all or most of the available output power that can be provided by the inverter circuit, however the use of all possible switching states in a typical space vector modulation scheme can lead to unacceptable common-mode voltages in the power conversion system

Method used

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  • Multilevel converter systems and methods with reduced common mode voltage
  • Multilevel converter systems and methods with reduced common mode voltage
  • Multilevel converter systems and methods with reduced common mode voltage

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Embodiment Construction

[0032] Referring now to the above figures, 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 the various features are not necessarily drawn to scale.

[0033] The Space Vector Modulation (SVM) operation process and power conversion arrangement are disclosed hereinafter in the context of a Nested Neutral Point Clamped (NNPC) multilevel converter stage 100, however other forms suitable for Space Vector Modulation may be used. and types of multilevel converter stages – including but not limited to switched capacitor multilevel converters, cascaded multilevel converters such as cascaded H bridges (CHB), neutral point clamped (NPC) multilevel converters Level shifter stages, modular multilevel converters (MMCs), NNPC stages, etc. - the various aspects and concepts of this disclosure are used.

[0034] First, refer to figure 1 , illustrates an exemplary...

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Abstract

Multilevel converters and space vector modulation operating methods are presented in which fewer than all possible switching states are employed for space vector modulation of rectifier and inverter circuits to promote common mode voltage contribution cancellation or reduction therebetween and by using subsets of possible space vector modulation switching states associated with minimal positive or negative common mode voltages and in some cases using virtual vectors which have zero common mode voltages to eliminate the 3rd order harmonic components in common mode voltage as well as to reduce common mode voltage affects associated with multilevel inverter stages.

Description

technical field [0001] The present application relates generally to power conversion, and more particularly to a multilevel converter system and method with reduced common-mode voltage. Background technique [0002] Multilevel converters can be used to rectify alternating current (AC) to produce direct current (DC), and can also be used to generate an AC output voltage for use in electric motors or other power conversion systems. This modular version of the converter is particularly useful where a larger output voltage is required. Multilevel voltage source converter architectures include fast or switched capacitor designs, neutral point clamped (NPC) designs, modular multilevel converters (MMC), and cascaded and hybrid types. The NPC design consists of a pair of capacitors connected across the DC input to provide a neutral point and a series of switches connected across the DC bus, where each capacitor is charged to half the value of the DC input and a pair of diodes switc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M7/217H02M7/487
CPCH02M5/4585H02M5/458H02M2001/123H02M7/487H02M7/483H02M2007/53876H02M5/4505H02M7/4833H02M1/123H02M7/53876H02M1/0095H02M7/4837
Inventor 田凯程仲元吴斌许德伟
Owner ROCKWELL AUTOMATION TECH
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