Sliding mode control of an ozone generator based on dual AC/DC/AC power converters

Abstract

The aim of this study was to design a first-order sliding mode controller for dual AC/DC/AC power converters to regulate the production of a corona discharge ozone generator. The design is presented in the two following parts: (a) The first part regulates a three-branch (phase) AC/DC converter to control the DC intermedium voltage that is required to produce the desired ozone concentration, while (b) the second part regulates a one-phase DC/AC power conversion circuit that regulates amplitude of the AC voltage that must be injected into the reaction chamber of the ozone generator. For the first section, the controller regulates the switching sequence yielding the control of the input currents, which defines the amplitude of the DC voltage. In the second, the switching control regulates the amplitude of the expected output AC signal, which depends on the obtained DC voltage from the AC/DC section. This structure represents a novel form to adjust the functioning of the AC/DC/AC power device, which has not been used before in the context of ozone production. Lyapunov’s second method was the main tool for confirming the existence of an asymptotical equilibrium state point for the trajectory tracking deviation for both sections of the power converter. The voltage amplitude was tested on a previously validated mathematical model of a corona-effect ozone generator performance. Several numerical evaluations illustrated the efficient performance of the suggested discontinuous controller and considering the proposed switching sequence that realizes the control action. The proposed controller was contrasted with a usual proportional/integral/derivative (extended state) design, which is a common technique to regulate the ozone generation system.

Discrete sliding mode control with optimal generalized sliding function for non-minimum phase system

“…17 Nevertheless, there are several systems, where only inputs and outputs are available. 18 For this reason, over the last few years, the use of input-output (I/O) model has gained much attention in the synthesis of SMC. 19,20 The SMC is composed of two phases.…”

Adaptive sliding mode predictive power control of three-phase AC/DC converters

“…SMC has strong robustness against the system perturbations and uncertainties and thus provides an excellent dynamic response. [32][33][34] The system trajectory is guided toward the sliding surface and then all the points on the trajectory are forced to stay within the neighborhood of the sliding surface and thus achieving the stability. 35 The designed control law maintains the control variable to stay on the sliding surface in the existence of uncertainties and unknown perturbations.…”

A discrete repetitive adaptive sliding mode control for DC-DC buck converter

“…For over 50 years, sliding mode control (SMC) has been frequently adopted in many engineering applications. [1][2][3] The principle reason for this success is its insensitivity to matched parameter uncertainties and certain perturbations. The purpose of SMC is to drive system states onto a predefined surface in finite time and also to maintain them on this surface for all subsequent time.…”