Novel Control Approach for Modular Multilevel Converter Based on α β 0 Reference Frame Without PLL

Yuntao Zou, Jiangchao Qin, Lei Zhang, Zhengda Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Modular multilevel converter (MMC) has become the basic building block for multi-terminal direct current (MT-DC) system and dc grids. To effectively control the power flow of the ac-dc MMC systems, the dual-loop power decoupling control based on dq reference frame is employed, which needs accurate phase information of ac grid through phase-locked loop (PLL). However, the control system may fail due to unstable PLL. In this paper, a novel power flow control approach based on alphabeta 0 reference frame without PLL is proposed, which consists of an inner loop for power decoupling and an outer loop for tracking power reference. Nonlinear state feedback is employed to eliminate time-varying and nonlinear terms through full-state linearization for constructing the inner loop. PI controller and feedforward compensation are used to build classical second-order damping elements for keeping fast dynamic response and tracking power reference in the outer loop. Performance of the proposed grid-connected control strategy for an high voltage MMC station is evaluated based on simulation studies in the PSCAD/EMTDC software environment. The study results illustrate the effectiveness of the proposed strategy for controlling the grid-connected MMC.

Original languageEnglish (US)
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3044-3049
Number of pages6
ISBN (Electronic)9781479973118
DOIs
StatePublished - Dec 3 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: Sep 23 2018Sep 27 2018

Publication series

Name2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Other

Other10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
CountryUnited States
CityPortland
Period9/23/189/27/18

Keywords

  • Clarke's transformation
  • Grid-connected converter control
  • Modular Multilevel Converter (MMC)
  • Nonlinear state feedback
  • Phase-lock loop (PLL)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Control and Optimization
  • Computer Networks and Communications
  • Hardware and Architecture
  • Information Systems and Management

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