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The development of a dead-beat current controller with a disturbance estimator for grid-connected single phase (1ϕ) voltage source (VS) inverter is presented in this paper. The 1ϕ VS inverter is connected to the grid using L-type filter. Disturbance estimator is employed to reject any disturbances due to controller time delay, inductance mismatch, and/or grid voltage disturbances. The design and analysis...
This paper proposes an optimal current control with linear quadratic regulators for 3-phase grid-connected inverters. Because the 3-phase current control is a multivariable control problem with multiple interconnected loops, the traditional control methods, like proportional-integral-derivative control and predictive control, have the difficulty in optimizing their parameters. The proposed control...
This paper proposes an improved current control algorithm for single-phase grid-connected inverters. The new algorithm has a superior performance over commonly used predictive current control methods. Conventional predictive control suffers from the inherent control delay in a digital control system. The proposed control algorithm applies an appropriate digital controller to compensate for the influence...
Three-phase PWM voltage-source inverters (VSI) are widely employed for distributed generation (DG) systems. Since the voltage at the point of common coupling should not be regulated by DGs, the current control strategy of grid-connected inverters plays a dominant role in providing high quality power to electric grids. The authors have proposed two advanced SVPWM-based current controllers to improve...
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