靠港船舶接入港口岸电时负载转移策略研究

Research on Load Transfer Strategy When Berthing Ships Connecting to Shore-to-ship Power Supply

靠港船舶使用港口岸电电源代替船侧发电机为船用负载供电,可有效减少环境污染。船舶靠港和离港时,岸电电源与发电机都存在短时并联的过程用来实现船舶负载的平滑转移。针对岸电电源采用传统下垂控制(Droop控制)实现负载转移时容易出现功率超调而导致船舶发电机逆功率的缺点,采用虚拟同步发电机(Virtual synchronous generator,VSG)策略对岸电电源进行控制,并提出二段式负载转移策略使岸电电源能够先与发电机均分负载功率再达到功率指令值,通过参数优化使负载在转移的过程中不出现功率超调进而提高船舶岸电系统的稳定性。仿真结果表明,所提策略可以有效解决岸电电源输出功率超调问题且保证了负载转移过程平滑、无冲击,研究成果可对岸电电源设计提供参考。

It can effectively reduce the environmental pollution if the berthing ship is connected to the shore-to-ship power supply instead of the ship side generator to supply power for the marine load. When the ship berths or leaves the port, there is a short-term parallel connection between the shore-to-ship power supply and the generator to realize the smooth transfer of the marine load. In view of the disadvantage that power overshoot is easy to occur when using traditional droop control to realize load transfer of shore-to-ship power supply, the virtual synchronous generator(VSG) strategy is adopted to control the shore-to-ship power supply,and a two-stage load transfer strategy is proposed to enable the shore-to-ship power supply to share the load power with the generator first and then reach the power command value. Through parameter optimization, the power overshoot in the process of transfer is avoided, and the stability of the system is improved. The simulation results show that the proposed strategy can effectively solve the problem of output power overshoot of shore-to-ship power supply, and ensure the load transfer process smooth and without impact.The research results can provide reference for the design of shore-to-ship power supply.