Electric Power Load Analysis

摘要

Between 1980 and 2012, Design Data Sheet DDS 310-1 was used to estimate the electric load of surface ships for the purpose of sizing electric generators. DDS 310-1 presents a calculation method based on the connected load of all the ships' loads, and an associated load factor for each operating condition. Created in a time when most loads were small in comparison to the rating of the generators, and power systems could tolerate short-term overloads, this method was sufficient. With the growth in electric load, more and more ships are employing medium voltage distribution systems and zonal transformers and/or power electronics-based power conversion. While the assumptions associated with DDS 310-1 were still generally applicable to the sizing of generators, it was not clear that these assumptions were still applicable for determining the rating of transformers and power conversion equipment. The variance in load around the long-term average due to cycling loads, and the limited overload capability of power electronics, called for improved methods to estimate load for determining the rating of equipment. Furthermore, advances in modeling and simulation offered improved insight of the electric load expected for power generation and power conversion equipment.