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http://dx.doi.org/10.6113/JPE.2012.12.4.595

Parallel Connected High Frequency AC Link Inverters Based on Full Digital Control  

Sha, Deshang (School of Automation, Beijing Institute of Technology)
Guo, Zhiqiang (School of Automation, Beijing Institute of Technology)
Deng, Kai (School of Electrical Engineering, Southeast University)
Liao, Xiaozhong (School of Automation, Beijing Institute of Technology)
Publication Information
Journal of Power Electronics / v.12, no.4, 2012 , pp. 595-603 More about this Journal
Abstract
This paper presents a full digital control strategy for parallel connected modular inverter systems. Each modular inverter is a high frequency (HF) AC link inverter which is composed of a HF inverter and a HF transformer followed by a cycloconverter. To achieve equal sharing of the load current and to suppress the circulating currents among the modules, a three-loop control strategy, consisting of a common output voltage regulation (OVR) loop, individual circulating current suppression (CCS) loops and individual inner current tracking (ICT) loops, is proposed. The ICT loops are implemented with predictive current control from which high precision current tracking can be obtained. The effectiveness of the proposed control strategy is verified by simulation and experimental results from parallel connected two full-bridge HF AC link inverter modules.
Keywords
Digital control; Current sharing; High frequency AC link inverters; Parallel connection; Predictive control current; Phase-shifted PWM;
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Times Cited By KSCI : 2  (Citation Analysis)
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