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This Green Book provides the design engineer with an understanding of the electrical parameters and methods required in designing compact AC and DC lines. Compact AC and DC lines are becoming increasingly necessary due to the limitation of right of way access and the need to upgrade power transfer in existing, narrower line corridors. Another requirement for compact AC lines is the lower impedance permitting increased power flow.

This book is the third in a series of four devoted to POWER ELECTRONIC CONVERTERS: The first of these concerns AC to DC conversion. The second concerns AC to AC conversion. This volume examines DC to DC conversion. The fourth is devoted to DC to AC conversion. Converters which carry out the DC-DC conversion operate by chopping the input voltage or current: they are called choppers or switch-mode power converters. Their operating frequency is not imposed by either the input or the output, both of which are at zero frequency. A frequency which is much greater than that of the industrial network can be chosen, provided that suitable configurations and semiconductor devices are used. This is the first difference compared to the rectifiers and AC-AC converters, analyzed in the previous volumes and which often operate at the industrial network frequency. The second difference concerns the commutation mode. Choppers operate in forced commutation.

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