摘要
针对厌氧发酵生产沼气过程中发酵温度具有非线性、大滞后的特点,传统PID控制方法难以对其实现精确控制的问题,设计了一种厌氧发酵温度模糊控制系统。系统由计算机、西门子S7-300 PLC、模糊控制器程序、Pt100温度传感器和执行机构等组成。阐述了温度模糊控制器的设计方法,并与传统PID控制系统进行了性能对比试验。试验结果表明:模糊控制系统可将反应器内发酵物料温度控制在(35±0.4)℃;加入扰动后,系统温度波动小,恢复到稳态时间短。较传统PID控制系统具有控制精度高、动态特性好、抗干扰能力强、鲁棒性好等优点,可实现对厌氧发酵温度的实时监测与精确控制。
Because there are the characteristics of strong nonlinear and big-lag on the temperature of biogas fermentation, the method of traditional PID is usually difficult to work precisely. According to this problem, a fuzzy control system was designed in this work for controlling the temperature of anaerobic digestion. The system consisted of computer, Siemens S7-300 PLC, fuzzy control program, temperature sensor Pt100 and executive arm et al. The design method of the system was introduced, and the performance of the system was compared with the traditional PID. The results showed that the temperature of mixture could be well controlled at the range of（35±0.4） ℃ by the fuzzy control system, and it could generate small fluctuations and return to steady state shortly after adding disturbances. It is concluded that there are many virtues existed in the fuzzy control system comparing with the traditional PID system such as high control accuracy, preferable dynamic performance, strong anti-interference ability and good robustness et al. Therefore, this system could preferably achieve real-time monitoring and accuracy control to the temperature of anaerobic digestion.
出处
《可再生能源》
CAS
北大核心
2014年第7期1016-1020,共5页
Renewable Energy Resources
基金
"十二五"国家科技支撑计划资助项目(2011BAD15B04)
东北农业大学科技创新基金(2011QNZ05)
关键词
厌氧发酵
模糊控制
温度控制
模糊控制器
鲁棒性
anaerobic fermentation
fuzzy control
temperature control
fuzzy controller
robustness
