冷藏集装箱船低压分区供电方案

Scheme of Low Voltage Power Supply in Districts of Refrigerated Container Vessels

在船舶电力系统设计中,电站总容量大小对系统的配电方式影响极大。大容量电站可以采用中压配电方式,但成本较高,维护复杂。如果采用低压配电方式,不仅可以降低建造成本,还可以降低后期的系统维护成本,但需要考虑低压系统母线短路容量和保护装置的分断能力能否满足要求。为解决大容量电站的低压供电设计问题,以冷藏集装箱船电力系统设计为例,分析电站运行工况,突破常规设计思路,开展三段低压440 V母线分区供电的配电设计研究。通过短路电流仿真计算母线最大预期短路电流以选择开关型号,并与常规两段母线供电方案进行比较,得到具有安全可靠系统保护功能且经济合理的9.8 MW容量电站低压分区供电、配电方案,为大容量电站选择合理的低压配电设计方案提供参考。

The total capacity of the power station of a vessel has great influence on the method of power distribution.The middle voltage power distribution could be used in large capacity power station,but the cost is high and it is not convenient for maintenance.Adopting the low voltage distribution could save the cost of construction and maintenance,but it also has requirement for the breaking capacity of protection devices.In order to broaden the choices of design methods for large capacity power station,a refrigerated container vessel was taken as an example,the conventional design ideas were brokens,and the three sections for AC 440 V power system through working conditions of power station were studied.By simulating the calculation of short-circuit current and comparing with common two bus bar power distribution system,the reliable and economical scheme as the researched results of AC 440 V bus bars being divided 3 subsections applied for 9.8 MW power station was obtained,serving as a design method for the reference of low voltage power system.