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http://dx.doi.org/10.6113/TKPE.2022.27.4.283

Voltage Control Scheme in Synchronous Reference Frame for Improving Dynamic Characteristics in Parallel Operation of Double-Conversion UPSs  

Mo, Jae-Sing (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University)
Yoon, Young-Doo (Dept. of Automotive Engineering, Hanyang University)
Ryu, Hyo-Jun (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University)
Lee, Min-Sung (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University)
Choi, Seung-Cheul (Dept. of Automotive Engineering (Automotive-Computer Convergence), Hanyang University)
Kim, Sung-Min (Div. of Electrical Engineering, Hanyang University, ERICA Campus)
Kim, Seok-Min (LS ELECTRIC Co. Ltd)
Kang, Ho-Hyun (LS ELECTRIC Co. Ltd)
Kim, Hee-Jung (LS ELECTRIC Co. Ltd)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.27, no.4, 2022 , pp. 283-290 More about this Journal
Abstract
This study proposes a voltage control scheme in a synchronous reference frame to improve the dynamic characteristics of double-conversion UPSs. UPSs need to control positive and negative sequence voltage, so that positive and negative sequence extractors are generally used to obtain each sequence of the voltage and current. Voltage and current controllers for each sequence are implemented. However, the extractor causes considerable delay, and the delay restricts the control performance, especially for the current controller. To improve the dynamics of the current controller, the proposed scheme adopts a unified current controller without separating positive and negative sequences. By using discrete-time current controller, the control bandwidth can be extended significantly so that negative sequence current can be controlled. To enhance the performance, an additional feed-forward technique for output voltage regulation is proposed. The validity of the proposed controller is verified by experiments.
Keywords
Additional feed-forward; Discrete-time current control; Double-conversion UPS; Synchronous reference frame controller; 2-DOF control;
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