Tampere University of Technology

TUTCRIS Research Portal

Impedance-based stability analysis of multi-parallel inverters applying total source admittance

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of the IEEE Workshop on Control and Modeling for Power Electronics (COMPEL)
Subtitle of host publication17-20 June 2019, Toronto, ON, Canada
ISBN (Electronic)978-1-7281-1842-0
ISBN (Print)978-1-7281-1843-7
Publication statusPublished - 1 Jun 2019
Publication typeA4 Article in a conference publication
EventIEEE Workshop on Control and Modeling for Power Electronics -
Duration: 1 Jan 1900 → …


ConferenceIEEE Workshop on Control and Modeling for Power Electronics
Period1/01/00 → …


The utility-scale wind and solar electricity production is typically connected to the power grid through multiple parallel three-phase inverters. One of the main issues in such grid-connected systems is the harmonic resonance caused by interactions between the grid and inverters. A common method for the analysis of these systems has been the impedance-based stability criterion. However, in systems that have multiple parallel inverters, the system complexity and challenges in obtaining the required impedance measurements may deteriorate the accuracy of the impedance-based approach. This paper discusses the aggregation of parallel inverters and the stability analysis of such grid-connected system. A simple method, based on impedance measurements, is shown for defining the allowable number of paralleled inverters so that the system remains stable. Experimental results are shown from power hardware-in-The-loop setup recently developed at DNV GL Flexible Power Grid Lab.

Publication forum classification