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To help the three-level PWM rectifier maintain good performance when the three-phase grid voltage is imbalanced, this paper analyzes the influence of grid voltage imbalance on the input current and the output voltage of PWM rectifier. On the basis of analyzing the instant reactive power and active power of the system, this paper adopts a method of the dual current regulations to control the imbalance;...
In three-level pulse width modulation (PWM) rectifier, the performances of the conventional predictive direct power control (PDPC) method are seriously degraded by the one-control-period delay and the discrete error of control variables. This paper investigates the problem by evaluating the influences of the control delay and the discrete control error on the performances of the system, and proposes...
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