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http://dx.doi.org/10.6113/JPE.2016.16.4.1483

A Resonant Characteristics Analysis and Suppression Strategy for Multiple Parallel Grid-connected Inverters with LCL Filter  

Sun, Jian-jun (Department of Electrical Engineering, Wuhan University)
Hu, Wei (Grid Center Department, State Grid Hubei Electric Power Research Institute)
Zhou, Hui (Department of Electrical Engineering, Wuhan University)
Jiang, Yi-ming (Department of Electrical Engineering, Wuhan University)
Zha, Xiao-ming (Department of Electrical Engineering, Wuhan University)
Publication Information
Journal of Power Electronics / v.16, no.4, 2016 , pp. 1483-1493 More about this Journal
Abstract
Multiple parallel inverters have multiple resonant frequencies that are influenced by many factors. This often results in stability and power quality problems. This paper develops a multiple input multiple output model of grid-connected inverter systems using a closed-loop transfer function. The influence factors of the resonant characteristics are analyzed with the developed model. The analysis results show that the resonant frequency is closely related to the number, type and composition ratio of the parallel inverters. To suppress resonance, a scheme based on virtual impedance is presented, where the virtual impedance is emulated in the vicinity of the resonance frequency. The proposed scheme needs one inverter with virtual impedance control, which reduces the design complexity of the other inverter controllers. Simulation and experimental tests are carried out on two single phase converter-based setups. The results validate the correctness of the model, the analytical results and the resonant suppressing scheme.
Keywords
Converters; DC-AC power converters; Modeling; Power electronics; Power system harmonics; Power quality; Resonance;
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