DC-link voltages balance method for single-phase NPC inverter operating with reactive power compensation

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

Abstract

Neutral point clamped (NPC) are one of the most used topologies for inverters in photovoltaic (PV) applications due to several operative advantages. The same hardware used for DC/AC conversion can be exploited to add reactive power compensation capabilities. In absence of PV generation (i.e. night hours) the DC link voltage have to be controlled by injecting or extracting active power to or from the DC link capacitors. While this technique is widely used in active power filters (APF) based on H-bridge inverters, the use of NPC inverters imposes a restriction due to potential imbalances in the voltages of DC-link capacitors, produced by DC components in the current of nonlinear loads being compensated. In this paper an analysis of DC currents effect is presented and an enabling method to allow reactive power compensation with single-phase NPC inverters is proposed and tested.

Original languageEnglish
Title of host publication2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference, COBEP/SPEC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728141800
DOIs
StatePublished - Dec 2019
Event15th IEEE Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference, COBEP/SPEC 2019 - Santos, Brazil
Duration: 1 Dec 20194 Dec 2019

Publication series

Name2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference, COBEP/SPEC 2019

Conference

Conference15th IEEE Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference, COBEP/SPEC 2019
Country/TerritoryBrazil
CitySantos
Period1/12/194/12/19

Bibliographical note

Funding Information:
ACKNOWLEDGMENT The authors want to thank to Universidad Politecnica Sale-siana in Cuenca, Ecuador, and Universidad Simon Bolivar in Caracas, Venezuela, for the institutional and financial support to this work.

Publisher Copyright:
© 2019 IEEE.

Keywords

  • active power filter
  • grid connected inverter
  • neutral point clamped
  • reactive power compensation
  • single-phase systems

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