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http://dx.doi.org/10.6113/TKPE.2017.22.1.89

Grid Voltage Estimation Scheme without Phase Delay in Voltage-sensorless Control of a Grid-connected Inverter  

Kim, Hyun-Sou (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
Kim, Kyeong-Hwa (Dept. of Electrical and Information Engineering, Seoul National University of Science and Technology)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.1, 2017 , pp. 89-93 More about this Journal
Abstract
This study proposes a grid voltage estimation scheme without a phase delay in the voltage-sensorless control of a grid-connected inverter to enhance its economic feasibility, such as manufacturing cost and system complexity. The proposed scheme estimates grid voltages using a disturbance observer (DOB)-based current controller to control the grid-connected inverter without grid-side voltage sensors. The proposed voltage-sensorless control scheme can be applied successfully to grid-connected inverters, which should be operated with synchronization to the grid, considering the phase angle of the grid can be effectively detected through estimating the grid voltages by DOB. However, a problem associated with the phase delay in estimated grid voltages remains because the DOB has dynamic behavior similar to low-pass filter. Hence, the estimated grid voltages are compensated by a phase lead compensator to overcome the limitation. The effectiveness of the proposed control and estimation schemes is proven through simulations and experiments using a 2 kVA prototype inverter.
Keywords
DOB(Disturbance observer) based controller; Grid-connected inverter; Grid voltage estimation; Phase lead compensator; Voltage-sensorless control;
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