A new power conversion system for megawatt pmsg wind turbines using four-level converters and a simple control scheme based on two-step model predictive strategy - Part i: Modeling and theoretical analysis

Venkata Yaramasu, Wu Bin, Marco Rivera, Jose Rodriguez

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

A new power conversion system is explored in this paper aiming wind turbines rated at the megawatt level. The proposed configuration consists of a medium-voltage, permanent magnet synchronous generator connected to a low-cost three-phase diode bridge rectifier, a dc-dc four-level boost converter as the intermediate stage, and a four-level diode-clamped inverter on the grid-side. The dc-link capacitor voltages are balanced by the boost converter, and thus the control complexity for the grid-tied inverter is greatly simplified. To control the boost converter and grid-tied inverter, a simple method based on a two-step model predictive strategy is presented. In the first part of this paper, the continuous- and discrete-time modeling of the proposed power conversion system is analyzed. The control objectives such as maximum power point tracking, dc-link capacitor voltages balancing, regulation of net dc-bus voltage, reactive power generation, lower switching frequency operation, and common-mode voltage minimization are considered in the design of controller.

Original languageEnglish
Article number6683027
Pages (from-to)3-13
Number of pages11
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Mar 2014

Keywords

  • AC-dc power conversion
  • boost converter
  • common-mode voltage (CMV)
  • current control
  • dc-ac power conversion
  • dc-dc power conversion
  • dc-link capacitor voltages balancing
  • digital control
  • direct-driven
  • four-level boost
  • grid-connected
  • maximum power point tracking
  • medium voltage (MV)
  • megawatt-level
  • multilevel converter
  • permanent magnet synchronous machine
  • power conversion
  • predictive control
  • renewable energy
  • state-space model
  • wind energy

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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