Sistemas de conversão estático com número reduzido de componentes.

Abstract

Reduced components electrical machine, become more and more important in the area that forms industrial electronics and electrical machine drive due to factors related with cost and size of the system. Despite of drive systems with reduced number of semiconductors devices being well known in the literature, these systems introduce some drawbacks in specific applications, for example, when the system size needs decreasing or when demand for cost reduction. A very usual technique for reduced components drive systems is sharing of one converter’s leg between the rectifier unity and the inverter unity, besides of dc-bus midpoint utilization. However, these shared leg configuration or dc-bus midpoint configuration can get some limitations due to dc-bus voltage capability. The decreasing in the number components can become indispensable, especially in applications with multiple machines because exists a direct relation between the increasing the amount of machines and the need increase the number of components to drive them. To discuss each point previously mentioned, this work addresses reduced components drive systems in a general way. The mentioned reduction is referred to the decreasing of number of semiconductors devices as well as boost inductors filters so that the reduction of the first will have a greater impact in the size of the system while the reduction of semiconductors will result economy. Therefore, has been proposed new converter configurations as discussed before, in addition is proposed a control technique that become these proposed topologies more attractive, as a point of view of different performance, like dc-bus voltage and capacitor current capability.