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Journal of Zhejiang University SCIENCE C 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/FITEE.1700728


A flexible hybrid PWM strategy based novel cascaded grid simulator with improved internal model repetitive controller


Author(s):  Yao-wei HU, Hao CHEN, Dong-dong CHEN, Guo-zhu CHEN

Affiliation(s):  College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   gzchen@zju.edu.cn

Key Words:  Grid simulator, Fundamental wave generator, Harmonic wave generator, Improved internal model repetitive controller, Flexible hybrid PWM strategy


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Yao-wei HU, Hao CHEN , Dong-dong CHEN, Guo-zhu CHEN. A flexible hybrid PWM strategy based novel cascaded grid simulator with improved internal model repetitive controller[J]. Frontiers of Information Technology & Electronic Engineering, 1998, -1(-1): .

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publisher="Zhejiang University Press & Springer",
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Abstract: 
To test the stability of grid-tied converters for renewable energy generation under severe conditions, a high power grid simulator is needed to emulate various types of realistic grid disturbances. However, the biggest challenge is to achieve high harmonic voltage control accuracy with as little switching loss as possible, and to realize the fast dynamic response required by tests of low voltage ride through (LVRT) and high voltage ride through (HVRT). In this paper, a novel cascaded grid simulator is proposed, which consisting of a fundamental wave generator (FWG) and a harmonic wave generator (HWG). Because the fundamental power flows through the FWG, the switching frequency of the FWG should be low and that of the HWG can be properly higher. A flexible hybrid pulse width modulation (FHPWM) strategy is provided with a detailed theoretical analysis of its harmonic distribution. The control precision of the harmonic voltage and the switching loss can be well traded off. To improve the dynamic response speed, an improved internal model repetitive controller (IIMRC) to control the (nk+n/m, nk-n/m)-order harmonics is also proposed, which can reduce the inherent delay of the controller to 2/n times the fundamental period. All these proposed topology, control and modulation strategies are verified by Matlab/Simulink simulations.


This article has been retracted at the authors’ request, as it shows significant overlap with another publication [Hu YW, Yang RC, Shao YT, et al., 2019. CRC and NHPWM method for test bench based on cascaded converter. IET Power Electron, 12(1):11-21. doi:10.1049/iet-pel.2018.5477].

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