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A comprehensive study of orthogonal signal generation schemes for single phase systems

Gautam, S, Hassan, W ORCID: 0000-0002-1926-1724, Bhatta, A, Lu, DD-C and Xiao, W 2021 , 'A comprehensive study of orthogonal signal generation schemes for single phase systems', in Proceedings of the 1st International Conference on Power Electronics and Energy (ICPEE) , Institute of Electrical and Electronics Engineers, United States, pp. 1-8 , doi: 10.1109/ICPEE50452.2021.9358671.

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Abstract

Single phase dq (park) transformation finds widespread application in grid interfaced converter current control, phase locked loop, reference current generation and active/reactive power calculation. The method requires additional signal to create orthogonal set and transform it to rotating frame. This is generally achieved using orthogonal signal generation(OSG) unit. As park transformation is instantaneous, associated dynamic and steady state performance depends on how fast and accurately OSG can generate orthogonal signal set while eliminating noises and disturbance signal. Moreover, power calculation in stationary frame also necessitates orthogonal sets of voltage and current signal. This paper presents a comprehensive comparative study of several OSG mechanisms reported in literature and applied to single phase systems. Various aspects of OSGs are assessed including dynamic response, accuracy, disturbance rejection feature, frequency adaptability and implementation. Moreover, issues in complex coefficient filter based OSG are identified and a generalized time delay transformation with reduced computation is also suggested. The discussions presented are substantiated via simulation results.

Item Type: Conference Publication
Authors/Creators:Gautam, S and Hassan, W and Bhatta, A and Lu, DD-C and Xiao, W
Keywords: OSG, all-pass filter, SOGI, hilbert filter, complex coefficient filter, inverse park transform
Journal or Publication Title: Proceedings of the 1st International Conference on Power Electronics and Energy (ICPEE)
Publisher: Institute of Electrical and Electronics Engineers
DOI / ID Number: 10.1109/ICPEE50452.2021.9358671
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Copyright 2021 IEEE

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