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http://dx.doi.org/10.6113/JPE.2013.13.3.487

New Control Strategy for Three-Phase Grid-Connected LCL Inverters without a Phase-Locked Loop  

Zhou, Lin (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University)
Yang, Ming (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University)
Liu, Qiang (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University)
Guo, Ke (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University)
Publication Information
Journal of Power Electronics / v.13, no.3, 2013 , pp. 487-496 More about this Journal
Abstract
The three-phase synchronous reference frame phase-locked loop (SRF-PLL) is widely used for synchronization applications in power systems. In this paper, a new control strategy for three-phase grid-connected LCL inverters without a PLL is presented. According to the new strategy, a current reference can be generated by using the instantaneous power control scheme and the proposed positive-sequence voltage detector. Through theoretical analysis, it is indicated that a high-quality grid current can be produced by introducing the new control strategy. In addition, a kind of independent control for reactive power can be achieved under unbalanced and distorted grid conditions. Finally, the excellent performance of the proposed control strategy is validated by means of simulation and experimental results.
Keywords
Control strategy; Grid-connected inverters; Instantaneous power control scheme; LCL filter; Positive-sequence voltage detector;
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Times Cited By KSCI : 2  (Citation Analysis)
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