The Performance comparative of Backstepping, Sliding Mode and PID controllers designed for a single-phase inverter UPS

Abstract

This paper focuses on the problem of controlling a single phase DC-AC switched power converter used in Uninterruptible Power Supply (UPS). The control objective is to generate, at the system output, a sinusoidal voltage with amplitude and frequency fixed by the reference signal. To this end, three types of regulators are designed based on Backstepping technique, Sliding Mode approach and linear PID controller. A comparative study of performances of designed controllers is made by simulations in Matlab/Simulink environment.

Control of power electronic interfaces in distributed generation.

“…However, the dependency of these controllers to the knowledge of the system parameters limits their practical application. In [38] the performance of two nonlinear controllers, namely backstepping and sliding mode controllers, are compared with a conventional PID controller. The results show the backstepping controller outperforming the other two controllers.…”

“…The results show the backstepping controller outperforming the other two controllers. The sliding mode controller always generates a very harsh command compared to backstepping [38]. The control laws of the proposed backstepping and sliding mode controllers in [38] depend on the numerical derivative of the output current which increase the level of the noise in the system.…”

“…As it was mentioned earlier in the Introduction section this control law is applicable for any converter/inverter in the class of buck-type converters. The control laws of the proposed backstepping and sliding mode controllers in [38] depend on the numerical derivative of the output current which increase the level of the noise in the system. In [57] and Chapter 3 a backstepping controller is proposed for the control of H-Bridge inverter with a nonlinear load with a very good tracking performance demonstrated.…”

“…In [57] and Chapter 3 a backstepping controller is proposed for the control of H-Bridge inverter with a nonlinear load with a very good tracking performance demonstrated. In the control schemes presented in [38] and [57], two sensors are used to measure output voltage and current in addition to another current sensor for the inductor current. In practice this inductor current measurement has a significant amount of ripple resulting from PWM switching.…”

“…Furthermore, because this observed inductor current is based off of the cycle average model of the VSI the aforementioned ripple is not present in the signal. Also, in the proceeding output current observer development an observation for the derivative of output current is achieved which eliminates the need for a noise-sensitive numerical derivative such as that utilized in [38]. The elimination of the sensors along with the elimination of current ripple and noise provides an advantage over previous methods.…”