科研之友
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摘要
On the basis of analyzing the mathematical model of three-level rectifiers and the theory of instantaneous power, an energy-current dual closed loop control strategy is proposed in this paper. By analyzing the instantaneous power of the system, the relationship of the power and the DC voltage can be found. Thus the energy storage of the DC bus capacitor can be taken as the controlling variable of the outer loop to regulate the DC voltage indirectly. In order to control the active current and the reactive current independently, the current feed-forward decoupling method is adopted by the inner current loop. Parameters of the energy-current loops are also designed in this paper. The SPWM modulation strategy based on the zero-sequence voltage component injection is adopted for balancing the neutral-point-potential of the three-level rectifier. Correctness of the theoretical analysis is proved by the experiment. By comparing the results of the energy-current control strategy and the voltage-current control strategy, the former demonstrates better dynamic performance.
