A Resonant Characteristics Analysis and Suppression Strategy for Multiple Parallel Grid-connected Inverters with LCL Filter
| Autor: | Wei Hu, Jiang Yiming, Hui Zhou, Jian-jun Sun, Xiao-ming Zha |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
business.industry 020209 energy 020208 electrical & electronic engineering Resonance 02 engineering and technology Converters Grid Stability (probability) Transfer function Control and Systems Engineering Control theory Power electronics 0202 electrical engineering electronic engineering information engineering Inverter Electrical and Electronic Engineering business Resonant inverter |
| Zdroj: | Journal of Power Electronics. 16:1483-1493 |
| ISSN: | 1598-2092 |
| DOI: | 10.6113/jpe.2016.16.4.1483 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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