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A reliable suppression method of high frequency circulating current in parallel grid connected inverters
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Publication Year
2019-09-01
Journal
2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
Publisher
Institute of Electrical and Electronics Engineers Inc.
Citation
2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019, pp.1026-1031
Keyword
Circulating currentGrid connected inverterParallel operationPhase difference
All Science Classification Codes (ASJC)
Mechanical EngineeringControl and OptimizationEnergy Engineering and Power TechnologyElectrical and Electronic Engineering
Abstract
This paper introduces a method to reduce circulating current with high frequency in parallel inverters. The high frequency component of circulating current is generated by output voltage discrepancy of each inverter module in parallel. When inverter modules are connected in parallel and have individual digital controller, the multiple carriers for PWM cannot be synchronized without special compensation method. The traditional compensation method is based on carrier synchronization by additional communication or reference signal. However, the existing compensation methods are increasing system complexity and maintenance cost. This paper proposes an improved reduction method by adjusting carrier's period according to the magnitude of zero sequence current. The proposed method can be implemented only by adding S/W code. The characteristics of circulating current due to phase difference between carries is also analyzed. The proposed method is verified by PSIM simulation.
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/36429
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85076737710&origin=inward
DOI
https://doi.org/10.1109/ecce.2019.8912758
Journal URL
http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8897530
Type
Conference
Funding
This work was supported bytheKorea Instituteof EnergyTechnology Evaluationand Planning (KETEP) grant fundedbytheKorea government (MOTIE) (No.20182410105160, Demonstration and Development of ESS SolutionConnectedwithRenewable Energy againstwiththeweather condition ofMiddleEast Region)
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Lee, Kyo-Beum이교범
Department of Electrical and Computer Engineering
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