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In this paper, a simplified robust control is proposed to improve the performance of three phase current controlled voltage source converter connected to the grid with an inductance-capacitor-inductance (LCL) filter. The presence of the LCL filter resonance complicates the control system dynamics and limits its overall performance, particularly when disturbances and parametric uncertainty are considered...
This paper proposes a new current control strategy for LCL-filtered grid-connected inverters based on the uncertainty and disturbance estimator (UDE). To ensure system stability, the LCL filter resonance is actively damped using the classical approach of feeding back the filter capacitor current giving rise to a combined active damping with UDE based control structure. The UDE based control method...
The design of current controller of voltage source converter connected to the grid through an LCL filter becomes more and more challenging because of the LCL filter resonance behaviour and the uncertainty of the grid impedance value which may lead to instability problems. In this context, a robust active damping control for LCL filtered grid connected inverter under grid inductance variation is proposed...
This paper deals with the problem of LCL filter resonance in grid connected inverter control. The system equations are reformulated to allow the application of the active disturbance rejection control (ADRC). The resonance, assumed unknown, is treated as a disturbance, then estimated and mitigated. By using this new robust control, a high level of performance is achieved with a minimum complexity...
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