基于变论域模糊方法的电力推进船舶二次调频控制

Electric propulsion ship secondary frequency control based on variable universe fuzzy method

[目的]针对负荷功率扰动引起的船舶电力系统频率波动问题,[方法]提出引入电池储能单元平衡船舶功率的方法,采用变论域模糊控制对船舶电站进行二次调频控制。以频率偏差及其变化率作为控制器输入,采用增量法设计伸缩因子,在控制规则不变的情况下对论域进行扩大和缩小,以提高控制精度。[结果]仿真结果表明,引入电池单元可减少系统频率的波动次数,缩短频率恢复稳定时间。[结论]与传统的模糊控制相比,变论域模糊控制在外部扰动和参数摄动情况下均具有较好的控制性能,所提方法可保证其较好的鲁棒稳定性与鲁棒性能。

[Objectives]This paper aims to solve the frequency fluctuation in a ship's power system caused by power disturbances.[Methods]To this end,a battery energy storage method is introduced to balance the output power and demand power,and the variable universe fuzzy method is utilized for the secondary frequency control of the ship's power system.In order to improve the control precision,area control error and change rate of the controller input,an incremental method is used to design a scaling factor that will expand or reduce the universe in case the control rule is unchanged.[Results]The simulation results show that a ship's power system which contains a battery can reduce the frequency fluctuation and make it stable in a short time.[Conclusions]Compared with the traditional fuzzy control,the proposed method offers better performance under external disturbances and parameter perturbation.The proposal in this paper can guarantee robust stability and robust performance.