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

Jianjun Sun | Zendy; Wei Hu | Zendy; Hui Zhou | Zendy; Yiming Jiang | Zendy; Xiaoming Zha | Zendy

Open Access

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

Author(s) -

Jianjun Sun,

Wei Hu,

Hui Zhou,

Yiming Jiang,

Xiaoming Zha

Publication year - 2016

Publication title -

journal of power electronics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.23

H-Index - 33

eISSN - 2093-4718

pISSN - 1598-2092

DOI - 10.6113/jpe.2016.16.4.1483

Subject(s) - inverter , correctness , resonant inverter , electrical impedance , control theory (sociology) , filter (signal processing) , electronic engineering , transfer function , stability (learning theory) , grid , power (physics) , resonance (particle physics) , computer science , rlc circuit , topology (electrical circuits) , engineering , physics , mathematics , capacitor , electrical engineering , control (management) , algorithm , voltage , geometry , quantum mechanics , artificial intelligence , machine learning , particle physics

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.

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