ABSTRACT
System compensation corresponds to the system design such that the given requirements or specifications are satisfied. Typically, an additional system is introduced in the appropriate connection with the system to be controlled in order to compensate its behavior. The most common compensation units are: cascade compensation; feedback compensation; and mixed compensation. The goal of the control systems design is the determination of the appropriate input signal so as the controlled process achieves the desired performance. The acronyms of the PID controller is from the initials of proportional, integral, and derivative, corresponding to the analog, integrated, and differential operation, performed by the controller. After the calculation of each error sample, a digital PID controller follows a process, the so-called PID algorithm, to calculate the controller's output, which is based on the error samples. The PID algorithm has two versions: the position version and the velocity incremental version.
