Dear Rudra Prakash,

The problem posed for the PID controller is the best determination of its gains; we can help each other in this task by using evolutionary algorithms such as PSO or GA to optimally determine the gains of the PID controller or other techniques. It is precisely this advantage acquired in favor of the sliding mode controller over the PID controller in this application; besides that the SMC method has stability and robust performances than that of the PID controller.

For more information about this subject i suggest you to see links files on topic.

https://hal.archives-ouvertes.fr/hal-01589518/document

https://core.ac.uk/download/pdf/19127291.pdf

Article Review of sliding mode based control techniques for control ...

Article Performance Comparison between Sliding Mode Control with PID...

Article A hybrid PID control scheme for flexible joint manipulators ...

Article Design of Fuzzy-PID Controller for Path Tracking of Mobile R...

Best regards

Dear Rudra Prakash , Proportional, integral and derivative are the basic modes of PID controller. Proportional mode provides a rapid adjustment of the manipulating variable reduces error and speeds up dynamic response Integral mode achieves zero offset. Derivative mode provides rapid correction based on the rate of change of controlled variable.

But:

Sliding Mode Control (SMC) is rapidly gaining popularity due to its practical success and fairly straightforward firmware implementation. SMC produces a discontinuous on/off signal that forces the system to slide along the desired system’s behavior. Unlike Proportional Integral Derivative (PID) controllers, which are perhaps the most commonly used feedback controller, SMC uses a discrete sliding decision rule in which the system flows through both continuous and discrete modes resulting in a hybrid feedback configuration. in order to achieve the most robust and precise results, we made the decision to implement Sliding Mode Control using the analog output of the force sensor. While this is a more complex solution, it provides us with the best results and is one of the most promising techniques in Robust Control Systems.

Please read the above literature recommended by above researchers. e.g Mohamed-Mourad Lafifi

In my view, Sliding mode control is more robust and it is more general than PID controller, If you can select a suitable sliding surface. The PID controller have more limitation related to sliding mode, but you should applied both on your model and compare them. In some case PID can also have good response.

Dear Rudra Prakash,

Sliding mode control (SMC) provides relatively many advantages compared to other robust nonlinear control methods such as insensitive to unmodeled dynamics /external disturbances, good robustness and ability to handle nonlinearities, controller structure is simple and easily tunable and in order to remove steady state error in the design procedure of the SMC, an action error added in the sliding surfaces.

For more information about this subject i suggest you to see the following paper.

Novel robust super twisting integral sliding mode controller

for a quadrotor under external disturbances

Best regards,

Compared to the PID controller, sliding mode control can provide better performance if a suitable sliding surface is selected.