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Large renewable energy systems, e.g., photovoltaic and wind turbine, are connected to grid, which is usually weak, with long lines. This degrades power system stability and reliability. Additionally, the magnetic characteristic of a conventional power transformer (CPT) implies a slow dynamic and leads to grid current harmonic too high when wind speed is low and irradiance is weak. This paper proposes...
This paper investigates the stability regions of current control for LCL-filtered grid-connected converters, where no active or passive damping is required to stabilize the closed-loop control system. It is already identified in the literature that if the LCL resonance frequency is placed within 1/6 to 1/2 of the system sampling frequency, the grid current control can be directly used without damping...
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