Multi-loop control algorithms for seamless transition of grid-connected inverter

Qin Lei, Shuitao Yang, Fang Z. Peng

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

27 Scopus citations

Abstract

The grid-connected inverter works as a controlled current source in grid-connected mode, while operates as a controlled voltage source in standalone mode. So in case of utility faults or intentional islanding, the inverter has to change its control strategy from current control to voltage control. This paper first proposed a multi-loop voltage controller with capacitor differential voltage feedback inner loop and voltage reference feedforward for standlone system especially designed to maintain the voltage continuity and decrease the dynamic response time in transition. However, the turn-off characteristics of the SSR which is used as switch here makes the transition last for a long time up to half a cycle. So in order to force the grid currents through the SSR switches to decrease to zero at much less time and make the voltage fluctuates within permissible levels during SSRs turnoff period, the voltage control based voltage amplitude regulation, instantaneous voltage regulation algorithms and current control based zero current regulation algorithms have been adopted in transition. After disconnection from the grid, the inverter will recover its voltage to a rated level. Simulation and experiments are carried out to verigy the proposed controllers and algorithms.

Original languageEnglish (US)
Title of host publicationAPEC 2010 - 25th Annual IEEE Applied Power Electronics Conference and Exposition
Pages844-848
Number of pages5
DOIs
StatePublished - May 18 2010
Externally publishedYes
Event25th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2010 - Palm Springs, CA, United States
Duration: Feb 21 2010Feb 25 2010

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Other

Other25th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2010
CountryUnited States
CityPalm Springs, CA
Period2/21/102/25/10

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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