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

Energies

Zheng Zheng¹  Yousong Zhou¹  Haijun Tao¹  Guopeng Zhang¹ 

[1] School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454003, China;

关键词: multi-paralleled inverters;    different rated power;    digital notch filter;    resonance interaction;   

DOI  :  10.3390/en12091656

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown