Parallel Resonance Mechanism Analysis and Suppression of Inductance-Capacitance-Inductance Grid-Connected Inverters

Haijun Tao, Yousong Zhou, Guopeng Zhang and Zheng Zheng
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Haijun Tao: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
Yousong Zhou: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
Guopeng Zhang: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China
Zheng Zheng: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China

Energies, 2019, vol. 12, issue 9, 1-15

Abstract: The resonance problem of multi-paralleled grid-connected inverters with inductance-capacitance-inductance (LCL) filters is a core matter which bothers the safety and stability operation of new energy distribution networks. Based on the impedance model of the paralleled system of two inverters, the influence of inverters on grid-connected current was analyzed through the superposition principle, and the grid-connected current was decomposed. The resonant mechanism generated by interactive current and the common current was studied, and the resonance frequency characteristics were compared and analyzed by a paralleled system using the same and differently rated power inverters. Based on the resonance frequency generated by interactive current, a digital notch filter was introduced into the traditional capacitance current active damping control scheme, which realized the non-static control of base wave signal and satisfied the standard of multi-paralleled grid-connected inverters with LCL filters. Finally, simulation results verified the correctness and validity of the proposed strategy.

Keywords: multi-paralleled inverters; different rated power; digital notch filter; resonance interaction (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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