Avoiding undesirable high-frequency phenomena in long cable drives: Rectifier-to-inverter connection through long DC cable — part I: Evaluation of the losses reduction and copper economy

Problems involving long cable PWM motor drive systems are well documented in the literature. Solutions based on passive filters are conventionally used to suppress the undesired high-frequency phenomena that take place in such systems, but, in turn, bring up new considerations concerning filter size, weight, cost and electrical losses. In this context, an alternative concept of a motor drive system that overcome all these problems is outlined in this paper, where the long cable is used to connect the rectifier to the inverter, thus establishing a DC power transmission link. This paper briefly discusses the benefits and important issues concerning the proposed system and presents a comprehensive analysis regarding one of its advantages, which is the copper (and cost) economy in relation to the traditional systems.

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