Multiloop control strategy for grid-interfaced three-phase voltage source inverter with passively damped LLCL-filter

H. Azani, A. Massoud, L. Ben-Brahim, B. W. Williams, D. Holliday

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In inverter-based distributed generation (IBDG) and similar to the conventional third order LCL filter, the high order LLCL filter is difficult to stabilize, and may cause a resonance between the inverter and the grid. Passive damping techniques were explored in literature by connecting a resistor in different locations of the LLCL filter. This paper presents the performance of the high-order LLCL-filter with RC passive damping circuit through evaluating the system stability using dual-loop control strategy that has been applied to the LCL-filter. Comparative analysis regarding PI and PR controllers used in the proposed control strategy is offered. Simulation results using Matlab are conducted, presented, and discussed.
Original languageEnglish
Title of host publication3rd Renewable Power Generation Conference (RPG 2014)
Place of PublicationStevenage
Number of pages6
Publication statusPublished - 24 Sep 2014
EventIET Renewable Power Generation Conference (RPG 2014) - Naples, Italy
Duration: 24 Sep 201425 Sep 2014


ConferenceIET Renewable Power Generation Conference (RPG 2014)



  • proportional-resonant controller
  • LLCL filter
  • passive damping
  • multiloop control strategy
  • proportional-integral controller
  • resistors
  • distributed power generation
  • invertors
  • passive networks
  • PI control
  • power generation control

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