Modifications to the synchronverter algorithm to improve its stability and performance

George Weiss, Vivek Natarajan

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

Abstract

Synchronverters are inverters that mimic the behavior of synchronous generators. In this paper, we propose modifications to the synchronverter algorithm to improve its stability and performance. The proposed modifications are implemented in software and do not require any changes in the inverter hardware. The first two modifications concern the control of the virtual field current in the synchronverter to make it more robust to faults. The next modification is to increase the effective size of the filter inductors virtually. This is well-motivated theoretically, using results from the stability analysis of synchronous generators connected to a AC power grid, and also by practical considerations: it dramatically improves the response of converter to an imbalance in the grid. This modification necessitates a change in the formula for the (virtual) nominal active mechanical torque. The third modification is to split the frequency droop loop into a low-pass and a high-pass branch, with a saturation on the low-pass branch, to ensure that the synchronverter is not required to supply or absorb active power exceeding physically possible values. We demonstrate the efficacy of our modifications using both simulations and experiments.

Original languageEnglish
Title of host publication19th International Symposium on Power Electronics, Ee 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-6
Number of pages6
ISBN (Electronic)9781538635018
DOIs
StatePublished - 8 Dec 2017
Event19th International Symposium on Power Electronics, Ee 2017 - Novi Sad, Serbia
Duration: 19 Oct 201721 Oct 2017

Publication series

Name19th International Symposium on Power Electronics, Ee 2017
Volume2017-December

Conference

Conference19th International Symposium on Power Electronics, Ee 2017
Country/TerritorySerbia
CityNovi Sad
Period19/10/1721/10/17

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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