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Energies 2017, 10(1), 104; doi:10.3390/en10010104

Modeling and Analysis of Resonance in LCL-Type Grid-Connected Inverters under Different Control Schemes

1
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
2
College of Automation & Electronic Engineering, Qingdao University of Science & Technology; Qingdao 266000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 1 November 2016 / Revised: 23 December 2016 / Accepted: 10 January 2017 / Published: 16 January 2017
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Abstract

As a basic building block in power systems, the three-phase voltage-source inverter (VSI) connects the distributed energy to the grid. For the inductor-capacitor-inductor (LCL)-filter three-phase VSI, according to different current sampling position and different reference frame, there mainly exist four control schemes. Different control schemes present different impedance characteristics in their corresponding determined frequency range. To analyze the existing resonance phenomena due to the variation of grid impedances, the sequence impedance models of LCL-type grid-connected three-phase inverters under different control schemes are presented using the harmonic linearization method. The impedance-based stability analysis approach is then applied to compare the relative stability issues due to the impedance differences at some frequencies and to choose the best control scheme and the better controller parameters regulating method for the LCL-type three-phase VSI. The simulation and experiments both validate the resonance analysis results. View Full-Text
Keywords: different control schemes; impedance; LCL-type grid-connected inverters; resonance analysis different control schemes; impedance; LCL-type grid-connected inverters; resonance analysis
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Yu, Y.; Li, H.; Li, Z.; Zhao, Z. Modeling and Analysis of Resonance in LCL-Type Grid-Connected Inverters under Different Control Schemes. Energies 2017, 10, 104.

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