Teaching nonlinear modeling, simulation, and control of electronic power converters using MATLAB/SIMULINK

Abstract

This paper describes an efficient method to teach analysis and simulation of power electronic converters to undergraduate students, using system level nonlinear state-space models. System-level modeling of power electronic converters reproduces only the ideal switching behavior of the semiconductors and is a useful concept for the numerical simulation of power converters, since simulations present no convergence problems and require little computational time. Switched state-space models, programmed in the MATLAB/SIMULINK software package, can be advantageously used to simulate power converters at the system level and also to design and study their controllers. Switched state-space nonlinear models should be obtained using a theoretical framework suitable for the enhanced control of variable structure power systems. Since the method is inherently nonlinear, no approximated linear models are needed; and since state-space models are used, modern control techniques (sliding mode, neural networks, fuzzy logic) for power converters can easily be used. This paper summarizes the proposed methodology and gives some examples.

Two Families of Sliding Mode Controllers for a Doubly-Fed Induction Generator in an Isolated Generation System

“…where: The model of the B2B is based in [8] and [9]. In this model, the output voltage of each converter depends on the gate signals or pulses g and on the dclink voltage V 0 .…”

“…The surfaces defined in (8) have a common form directly related with control objectives (7), while the surfaces in (9) have been defined because the operations associated with the controller design will be simpler than the corresponding to surfaces (8).…”

“…Although Utkin et al did not propose a general method for controlling electric machines, by analyzing their work following procedure has been defined: (I) System motion on subspace s 1,2 is found using (8), (6), (5) and the transformation given in Table 1: By considering surfaces (9) it can be obtained:…”

“…the surfaces transformation (13) The controller implementation must consider next steps: (i) determine sliding surfaces (8) or (9) from measurements; (ii) carry out sliding surfaces transformation by using (13); (iii) obtain control vector with (14); and (iv) determine gate pulses with proper expression in set (2).…”

Virtual lab: Space vector PWM for two-and three-level inverters

“…These disadvantages in the laboratory education of power electronics circuits can be overcome by using computer simulation programs [6]. The design and development of power electronics circuits can be performed more easily, more quickly, and have a lower cost with the appropriate computer simulation program [7]. Graphical user interfaces (GUIs) provide users with a visual approach in computer simulations [8].…”