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DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme

A three-level power supply, power conversion system technology, applied in the output power conversion device, irreversible DC power input to AC power output, electrical components and other directions, can solve problems such as expensive

Inactive Publication Date: 2007-02-28
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this closed-loop neutral balancing approach is expensive, requiring feedback sensing devices and advanced control algorithms to adjust the neutral voltage while still providing the desired AC output waveform

Method used

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  • DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme
  • DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme
  • DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme

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Embodiment Construction

[0029] Referring now to the drawings, several embodiments or implementations of the invention are described below in conjunction with the drawings, wherein like numerals are used to refer to like elements throughout. FIG. 1A shows an exemplary three-level inverter power conversion system 100 including a DC connection 100, a three-phase AC connection 120, and three phases including switch banks 130a, 130b, and 130c that commonly couple the DC and AC connections 110 and 120, respectively. stage switch network 130. The conversion system 100 also includes a space vector modulation (SVM) switch control 140 that provides open circuit suppression of even harmonics to effectively balance the neutral 0 of the DC connection 110 in accordance with one or more aspects of the present invention. DC link 110 includes first and second DC terminals 112a and 112b, respectively, for receiving DC power from a power source 114, and first and second capacitors C1 and C2 coupled in series between te...

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Abstract

Three-level inverter and rectifier power conversion systems and space vector modulation (SVM) controls having even-order harmonic elimination for neutral voltage balancing with a predefined vector switching sequences for half-wave symmetry in open loop system operation. The vector sequence listings for each SVM diagram segment includes switching state entries individually indicating one of three possible switching state levels positive (P), zero (0), or negative (N) for each of three or more switching groups of the power conversion system, with listings for each pair of first and second diametrically opposite diagram segments include symmetrically opposite switching states, with positive levels in the entries of the listing for the first segment corresponding to negative levels in the entries of the listing for the second segment and vice versa.

Description

[0001] related application [0002] This application requires serial number 60 / 671,714 submitted on April 15, 2005 entitled "DC VoltageBalance Control for Three-Level NPC Inverter with Selective Harmonic EliminationScheme" (using the selected harmonic elimination scheme for three-level NPC inverter Priority and rights to the U.S. Provisional Application for DC Voltage Balance Control), which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to power conversion, and more particularly to controls and methods for pulse width modulated operation of three-level inverter and rectifier type power converters. Background technique [0004] Power converters have been widely used in medium voltage motor drives, and other applications where power needs to be converted from DC to AC or vice versa. Such conversion means are typically referred to as inverters for converting DC to AC, or rectifiers if converting from AC to...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/537H02M7/5387H02M1/14
Inventor W·W·冯B·吴C·刘D·徐
Owner ROCKWELL AUTOMATION TECH
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