基于模糊逻辑的船用循环水泵转速控制方法

Methods for rotational speed control of marine circulating water pump based on fuzzy logic

[目的]在船舶上,由于汽轮机负载变化迅速,易导致冷凝器真空度波动剧烈。为实现真空度快速稳定,设计一种用于调节船用循环水泵转速的模糊控制器。[方法]通过优化控制器内增加的稳态工况预设值与模糊变量插值这2种方法,克服模糊控制器原本存在的稳态误差大和稳定性差的缺点,通过热力系统仿真,验证优化后的模糊控制器的控制效果。[结果]验证结果显示,与常规比例积分微分(PID)控制相比,优化后的模糊控制器能使冷凝器真空度达到稳定的时间减少约50%,最大误差减少约40%。[结论]优化后的模糊控制是实现循环水泵转速快速调节的有效方法。

[Objectives]The rapid change of load of the marine steam turbine easily leads to violent fluctuation in the vacuum degree of the condenser.In order to stabilize the vacuum rapidly,a fuzzy controller is designed to regulate the rotational speed of the circulating water pump.[Methods]It was optimized by adding the steady state preset value of the pump and the interpolation of fuzzy variables.The optimization overcame the shortcomings of traditional fuzzy controller such as large steady state error and poor stability.Through the simulation of thermal system,the control effect of the optimized fuzzy controller was verified.[Results]The verification results show that,compared with conventional PID control,the optimized fuzzy controller enables a reduction in time for vacuum of the condenser to be stabilized about 50%and a reduction in maximum error about 40%.[Conclusions]Therefore,the optimized fuzzy control is an effective method to realize fast rotational speed regulation of the circulating pump.