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http://dx.doi.org/10.6113/JPE.2011.11.4.456

Dual-Loop Power Control for Single-Phase Grid-Connected Converters with LCL Filter  

Peng, Shuangjian (College of Electrical and Information Engineering, Hunan University)
Luo, An (College of Electrical and Information Engineering, Hunan University)
Chen, Yandong (College of Electrical and Information Engineering, Hunan University)
Lv, Zhipeng (College of Electrical and Information Engineering, Hunan University)
Publication Information
Journal of Power Electronics / v.11, no.4, 2011 , pp. 456-463 More about this Journal
Abstract
Grid-connected converters have widely adopted LCL filters to acquire high harmonic suppression. However, the LCL filter increases the system order so that the design of the system stability would be complicated. Recently, sole-loop control strategies have been used for grid-connected converters with L or LC filters. But if the sole-loop control is directly transplanted to grid-connected converters with LCL filters, the systems may be unstable. This paper presents a novel dual-loop power control strategy composed of a power outer loop and a current inner loop. The outer loop regulates the grid-connected power. The inner loop improves the system stability margin and suppresses the resonant peak caused by the LCL filter. To obtain the control variables, a single-phase current detection is proposed based on PQ theory. The system transfer function is derived in detail and the influence of control gains on the system stability is analyzed with the root locus. Simulation and experimental results demonstrate the feasibility of the proposed control.
Keywords
Grid-connected converter; LCL filter; Power control; Power electronics; PQ theory; Root locus; Transfer function;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
Times Cited By SCOPUS : 2
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