Low Frequency Ripple-Free Finite Valued Electronic Capacitor

Pavel Strajnikov, Mor M. Peretz, Alon Kuperman

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

Abstract

Electronic Capacitors (ECs) are two-terminal "plug-and-play"active devices, typically utilized to replace bulk DC link electrolytic capacitance in grid-connected power conversion systems. An EC consists of a bidirectional power converter, terminated by small auxiliary capacitor, and a feedback control system, forcing the system to emulate a large finite capacitance at the output terminals, based on local measurements only. Typically, DC link voltage regulation is carried out by the outer loop controller of grid-connected converter, tuned to a specific value of DC-link capacitor. Therefore, accurate emulation of this specific capacitance by an EC is essential to preserve prescribed DC link voltage dynamics, which directly influences grid-side current quality. However, due to finite capacitance employed, steady-state DC link ripple is always present in grid-connected power systems. The paper proposes a modification of EC control structure, allowing to achieve near-zero DC-link ripple (i.e. emulating infinite capacitor in steady-state) while maintaining accurate transient dynamics of a specific finite-valued capacitance.

Original languageEnglish
Title of host publication2020 IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728171609
DOIs
StatePublished - 9 Nov 2020
Event21st IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2020 - Aalborg, Denmark
Duration: 9 Nov 202012 Nov 2020

Publication series

Name2020 IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020

Conference

Conference21st IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2020
Country/TerritoryDenmark
CityAalborg
Period9/11/2012/11/20

Keywords

  • DC link
  • capacitance
  • control systems

Fingerprint

Dive into the research topics of 'Low Frequency Ripple-Free Finite Valued Electronic Capacitor'. Together they form a unique fingerprint.

Cite this