With a view to improving the control accuracy and stability of the liquid level control system,the fractional order proportional integral derivative(FOPID)controller was applied there.Considering the FOPID's many adjustment parameters and its difficulty to adjust,the adaptive mixed strategy whale opti-mization algorithm(AMSWOA)was proposed for FOPID parameter tuning.In the experiment,both single and double tanks were adopted to simulate the liquid level control in the industry,including having the Matlab tool employed to simulate and model both FOPID controller and liquid level control system,and then having it compared with the integer order PID controller in simulation.The simulation and experimen-tal results show that,the FOPID controller based on AMS WO A,as compared to integral order PID con-troller,boasts small overshoot,quick adjustment time and low steady-state error.
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