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

Yanxue Yu, Haoyu Li, Zhenwei Li and Zhou Zhao
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Yanxue Yu: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Haoyu Li: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Zhenwei Li: College of Automation & Electronic Engineering, Qingdao University of Science & Technology; Qingdao 266000, China
Zhou Zhao: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Energies, 2017, vol. 10, issue 1, 1-17

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.

Keywords: different control schemes; impedance; LCL-type grid-connected inverters; resonance analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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