Abstract：This paper presents a novel structure of a multi-stage saturable magnetic-valve controllable reactor (MSMCR). The MSMCR can greatly reduce the output harmonics of the magnetic-valve controllable reactor (MCR). The working principle of the MSMCR is that there are several stages in the iron cores, these stages saturate at different time which also create current harmonics of different phases during the working process. Therefore, the current harmonics are compensated with each other and the total harmonics are reduced. The mathematical model which reveals the distribution characteristic of current harmonics for MSMCR is also presented. The results show that there are three main factors which will affect current harmonics the most: the stage quantity, the length and the area of each stage. The maximal current harmonics of the MSMCR can be theoretically reduced to 2.6% of the rated output current when the parameters in the model are properly chosen using the particle swarm optimization algorithm. The simulation and experimental results are the same with the theoretical results. It demonstrates that the mathematical model is correct and the MSMCR is effective in reducing the harmonics of the conventional MCR.
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2011, Vol. 26 
