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根据现场情况推导出第二级蓄水池的近似数学模型.基于控制对象迟滞、非线性的特点,将模糊PID控制应用于水位控制系统中.阐述了模糊控制器的设计过程:模糊化、模糊控制规则的建立和反模糊化,并给出合适的隶属函数、量化因子取值及模糊控制规则等.同时从理论上推导出模糊PID控制器消除稳态误差的原理,并用MAT-LAB工具箱对系统进行仿真试验.通过对仿真结果的分析得出:模糊PID控制器既能消除稳态误差,又有很强的鲁棒性,对于此类非线性迟滞系统具有良好地控制性能.
The approximate mathematical model of the second stage reservoir is deduced according to the site conditions.According to the hysteresis and nonlinearity of the control object, the fuzzy PID control is applied to the water level control system.The design process of the fuzzy controller is described: fuzzification, fuzzy The establishment of control rules and anti-fuzzy, and gives the appropriate membership function, the value of quantization factor and fuzzy control rules etc .. At the same time, the theory of fuzzy PID controller to eliminate steady-state error is deduced, and MAT-LAB Toolbox Simulation results show that the fuzzy PID controller can not only eliminate the steady-state error but also has strong robustness, and has good control performance for such nonlinear hysteresis system.