PLL-less robust active and reactive power controller for single phase grid-connected inverter with LCL filter

Xiao Li, Robert Balog

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

13 Citations (Scopus)

Abstract

Grid connected inverters, especially those used in DG (Distributed Generation) system, are expected with decoupled and flexible power control ability. Many existing power control methods are based on synchronous reference frame transformation, which requires the phase angle information provided by Phase-Locked Loop (PLL). This creates additional drawbacks of the system and makes the system complex. This paper presents a controller for single-phase grid connected inverter system with LCL filter in stationary reference frame. And PLL is avoided. Compared with traditional power control scheme for single phase grid-connected inverter controller, this control scheme has faster response, higher reliability and decoupled real and reactive power control ability. Moreover, the proposed controller has good robustness under different distorted grid conditions. Since the controller is totally implemented in stationary reference frame, the control algorithm comes to be simpler and easier. The designed current controller, combining the active damping technique, helps restrain the high resonant peak value. Compared with traditional PI based current controller, the designed current controller, which is based on the Proportional & Resonant (PR) controller, provides the system with high gain in wide range of frequency to track given reference value fast and output excellent grid current with low THD.

Original languageEnglish
Title of host publicationAPEC 2015 - 30th Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2154-2159
Number of pages6
Volume2015-May
EditionMay
DOIs
Publication statusPublished - 8 May 2015
Externally publishedYes
Event30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015 - Charlotte, United States
Duration: 15 Mar 201519 Mar 2015

Other

Other30th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2015
CountryUnited States
CityCharlotte
Period15/3/1519/3/15

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Keywords

  • active damping
  • decoupled power control
  • grid distortion
  • grid-connected
  • LCL filter
  • Phase-Lock Loop
  • PR controller
  • single-phase inverter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Li, X., & Balog, R. (2015). PLL-less robust active and reactive power controller for single phase grid-connected inverter with LCL filter. In APEC 2015 - 30th Annual IEEE Applied Power Electronics Conference and Exposition (May ed., Vol. 2015-May, pp. 2154-2159). [7104647] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2015.7104647