Title Observer-based Control for Grid-connected LCL-filtered Inverter with Only Grid Current Feedback
Authors LAI, NGOC BAO, Kim, Kyeong-Hwa
External publication Si
Means Destech Transactions On Engineering And Technology Research
Scope Proceedings Paper
Nature Científica
Publication date 01/01/2017
ISI 000426975600031
Abstract This paper presents an observer-based control scheme for a grid-connected LCL-filtered inverter with only grid-side current feedback. The proposed control scheme is composed of a state feedback regulator and an augmented state observer. The augmented state observer is used to estimate the inverter states which are then employed to construct the regulator. In addition to inverter states, the observer also estimates the grid voltages which are utilized to remove the effects of abnormal grid voltage and system parameter variations, as well as to synchronize the inverter with the grid. As a result of using the observer, only grid-side current sensors are required to control the inverter system even under unbalanced and distorted grid voltages. The effectiveness of the suggested control approach is verified through numerical results.
Keywords Grid-connected inverter; LCL filter; Observer-based control
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