Grid interconnection of renewable energy sources at the distribution level with power-quality improvement features

Mukhtiar Singh, Vinod Khadkikar, Ambrish Chandra, Rajiv K. Varma

Research output: Contribution to journalArticlepeer-review

441 Scopus citations

Abstract

Renewable energy resources (RES) are being increasingly connected in distribution systems utilizing power electronic converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink simulation studies and validated through digital signal processor-based laboratory experimental results.

Original languageBritish English
Article number5617328
Pages (from-to)307-315
Number of pages9
JournalIEEE Transactions on Power Delivery
Volume26
Issue number1
DOIs
StatePublished - Jan 2011

Keywords

  • Active power filter (APF)
  • distributed generation (DG)
  • distribution system
  • grid interconnection
  • power quality (PQ)
  • renewable energy

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