Shipboard Power System With LVDC and MVDC for AC and DC Application

The direct current LVDC (up to 1200 VDC) and MVDC (8000 VDC) are being considered for certain applications. The LVDC and MVDC distribution may not be cost effective, as the technology is not matured enough for commercial applications. However, there are major advantages of using the direct current main distribution bus which may be suitable for some applications, including the VFD applications. Unlike AC cables, the full cross section of a DC conductor is effective in the transmission of power. The paralleling of power sources only requires voltage matching and does not require time‐critical phase matching. This enables generator sets to come on line faster after starting, thereby reducing the aggregate amount of energy storage needed to provide power while another generator set is brought online. The DC distribution switchboard supplies power to various ship service loads with appropriate DC to AC converters.