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The three-phase unbalanced conditions of micro-grid will affect the control performance, so it is required to study the control of asymmetric systems. In this paper, based on three-phase unbalanced micro-grid system, connected with three-phase three-wire voltage source converter (VSC), the effect of asymmetric conditions on the VSC current control was studied. With the application of adaptive discrete...
This paper proposes an improved SVPWM-based digital predictive current controller for grid-side of motor energy feedback inverters. Firstly, a predictive current control strategy in the inner loop was adopted to minimize the system delay and improve the current response so that the grid-side current harmonics can be sharply reduced. Besides, load current feedforward compensation was added to reduce...
Large transient grid voltage unbalance will result in deterioration of the doubly-fed induction generators(DFIGs) by introducing over current of rotor side converter(RSC) and double frequency oscillation in dc link voltage and electromagnetic torque. The rotor current controller with the conventional reduced DFIG model, which does not take into account the stator flux transients, could not obtain...
This paper proposes an improved current control scheme for the rotor-side converter of a doubly-fed induction generator (DFIG) wind power generation system. The control scheme consists of a proportional (P) controller and a harmonic resonant (R) regulator tuned at the grid frequency. Thus, the positive and negative sequence components of rotor current are fully regulated by the PR controller without...
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