Optimizing PID controller tuning for greenhouse lighting control system by varying number of objectives

Nowadays, usage of optimization methods and techniques in various applications is the key factor of increasing the systems efficiency and performance. In this paper, Proportional-Integral-Derivative (PID) controller optimization in greenhouse lighting control system is studied by tuning PID controller coefficients. The advantages and disadvantages of employing multi-objective optimization methods have been discussed in many cases by researchers and engineers. In this regard, we consider the optimizing problem with varying number of objectives which are 1, 2 and 3 objectives. The simulation results verify that the improvement of the system output responses would be achieved by increasing the number of separated and independent objective functions.