Application of heuristic dynamic programming to wastewater treatment process control
Junfei Qiao · Control theory & applications · 2013
To control the dissolved oxygen concentration and nitrate concentration of wasterwater treatment process(WWTP),we propose a heuristic dynamic programming(HDP) method based on the echo state network(ESN).This scheme evaluates the current policy,and then the HDP controller adjusts the current policy according to the evaluation results.This procedure is continued until the optimal policy is found.Echo state networks are adopted to approximate the evaluation function and the optimal policy.To ensure the availability of the HDP controller,we investigate the parameter ranges of the HDP controller.Experimental results indicate that the ESN-based HDP controller has advantages over the PID controller in control stability and control precision.