Online detection of fundamental and interharmonics in AC mains for parallel operation of multiple grid-connected power converters
File(s)
Author(s)
Type
Journal Article
Abstract
Parallel operation of multiple grid-connected power converters through LCL filters is known to have the potential problem of triggering oscillations in the ac mains. Such oscillatory frequencies are not integral multiples of the fundamental frequency and hence form a new source of interharmonics. Early detection of such oscillations is essential for the parallel power converters to move out of the unstable zone. This paper presents an online observer-based algorithm that can perform fast detection of interharmonics within a specified frequency band. The algorithm has been adopted in a specific and reduced form from an integral observer algorithm for detection of fundamental and interharmonic voltage components in the ac mains. A new method based on the kernel signal for fast interharmonic detection is proposed and practically verified. It has been implemented in a digital controller to detect oscillations such as those occurring between two grid-connected power converters. The practical results indicate that the algorithm can locate such frequency within the specific frequency band within 1 mains cycle.
Date Issued
2018-11-01
Date Acceptance
2017-12-11
Citation
IEEE Transactions on Power Electronics, 2018, 33 (11), pp.9318-9330
ISSN
0885-8993
Publisher
Institute of Electrical and Electronics Engineers
Start Page
9318
End Page
9330
Journal / Book Title
IEEE Transactions on Power Electronics
Volume
33
Issue
11
Copyright Statement
© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Active power filters
fundamental extraction
harmonics detection
interharmonics detection
SYSTEMS
HARMONICS
INVERTERS
ELECTRONICS
FREQUENCIES
ALGORITHM
OBSERVER
FILTER
0906 Electrical And Electronic Engineering
Electrical & Electronic Engineering
Publication Status
Published
Date Publish Online
2018-01-03