文章基本信息

标题：Performance Evaluation of Model Predictive Current Controlled Grid Tied Converter for Sampling Frequency Variations
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作者：Bhadra R. Warrier ; A. Vijayakumari ; Sasi K. Kottayil 等
期刊名称：International Journal on Electrical Engineering and Informatics
印刷版ISSN：2085-6830
出版年度：2019
卷号：11
期号：3
页码：463-473
DOI：10.15676/ijeei.2019.11.3.1
出版社：School of Electrical Engineering and Informatics
摘要：Model predictive control is identified as one of the emerging control platforms whichcan replace the classical linear as well as sliding mode controls of power converters and drives.Implementing this algorithm in grid tied converter control imposes its design parameters likesampling frequency, cost function coefficients, model parameters etc. to be aptly chosen tomatch with hardware intricacies. Therefore, a detailed investigation for the interoperability ofvarious MPC design parameters and the relative performance across each case is felt necessary.This paper presents one such primary investigation carried out in the pre-experimentation stageto identify the correlation between sampling rates of model predictive control for desiredperformance indices like tracking accuracy, average inverter switching frequency, currentharmonic profile and inverter power loss applied to a three phase grid connected inverter.While implementing the control, a discrete time model representing a 15kW grid tied inverteris developed for current prediction followed by a suitable cost function formulation aimed ataccurate reference tracking. From the analysis, it is observed that the tracking accuracy greatlydepends on the prediction interval, which in turn depends on the sampling rates. The inverter istested for its dynamic performance by considering step change in reference and sourcespecifications besides steady state analysis. Extensive analysis for various combinations ofMPC design parameters and their relative performance merits on the inverter output ispresented. The results exhibited high reference tracking accuracy with improved harmonicprofile for high to moderate sampling frequencies, but with a tax on the inverter efficiency. Thechoice of switching frequency for a trade-off between high tracking accuracy and inverterefficiency is also suggested.
关键词：Grid tied inverter; model predictive control; tracking accuracy; sampling rates;switching loss; harmonic profile