Utility Scale Interface for Renewables and Storage Using a Power Electronic Transformer with Back-to-Back MMCs: A Novel Proposal and Control Scheme for Virtual Inertia

Vishnu Narayan Vipin, Abhijit Kshirsagar, Ned Mohan

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

Abstract

The increasing penetration of renewable energy sources into the grid has brought upon the need for synthetic inertia. This is to be meted out by the corresponding power electronic interfaces integrating these Distributed Energy Sources into the grid. In particular, a novel interface scheme using back-to-back MMCs to integrate wind turbines to the collection grid at voltages of 34.5kV has been shown to possess substantial potential for virtual inertia. The large stored potential energy in the virtual dc link between the MMCs is used to emulate the characteristics of a synchronous generator in case of step load changes. Inertial parameters of the back-to-back MMC has been derived enabling comparison with a synchronous generator connected to the grid. A control scheme to provide additional power to emulate the inertial characteristics of a synchronous generator has been developed. The corresponding over-ratings of currents and voltages to support this function have been quantitatively described. Frequency response characteristics due to step load changes in a weak grid has been considerably improved with the proposed interface scheme as verified by simulation results.

Original languageEnglish (US)
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages6682-6687
Number of pages6
ISBN (Electronic)9781479973118
DOIs
StatePublished - Dec 3 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: Sep 23 2018Sep 27 2018

Publication series

Name2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018

Other

Other10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
CountryUnited States
CityPortland
Period9/23/189/27/18

Keywords

  • Back-to-Back MMCs
  • Grid Integration
  • Power Electronic Transformer
  • Virtual DC link
  • Virtual Inertia

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