Abstract

The high-power grid-connected inverters with LCL filters have been widely used. Current control plays a vital role in the grid-connected inverter control system, when LCL filters are applied to this system. However, the inherent resonance of LCL filters has a huge impact on the stability of the current control system which is easy to cause inverter system unstable. In order to stabilize the system, need to damp the resonance peak. And in the digital control implementation process, time delay limits the system bandwidth and stability margin. In this paper, a systematic study is carried out on the relationship between the time delay and stability of single-current-loop controlled grid-connected inverter. The study is shown that inverter-side current feedback (ICF) employed to realize single-current-loop control, and proposed a solution to reduce the impact of time delay, which can be damp the resonance to guarantees adequate stability margins. The study that stability analysis is verified by simulation and experiment.

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