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For the modular multilevel converter (MMC) connected with the grid is the most important application. In this paper, an equivalent model of the MMC in the dq synchronous reference is deduced. Different from traditional converter, this model indicates both the inductance and the equivalent capacitance in the ac side would influence the system control. In order to simplify the control to the input currents,...
Aiming at the nonlinear output voltage equation of PWM rectifier, based on the topology with voltage-current double-loop control, a novel control method-fuzzy/PI+direct nonlinear control method for the output voltage is present. If the active current error is smaller than a threshold, PI+direct nonlinear control is used in order to ensure the linear control and stabilization precision of the output...
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