Multimedia Educational Material and Remote Laboratory for Sliding Mode Control Measurements

Abstract

The paper presents a multimedia educational program of DC servo drives for distant learning with a special emphasis on sliding mode control. The program contains of three parts: animation, simulation and internet based measurement. The animation program explains the operation of DC motors, gives its time-and frequency-domain equations, transfer functions and the theoretical background necessary for controller design for DC servo motors. The simulation model of the DC servo motor and the controller can be designed by the students based on the animation program. The students can also test their controllers through the internet based measurement, which is the most important part from engineering point of view. After the measurements are executed, the students can download the measured data and compare them to the simulation results.

Mathematical Basis of Sliding Mode Control of an Uninterruptible Power Supply

“…By completing the relay control laws with additional members, we can reach that the condition of sliding mode is fulfilled on the whole S surface [20]. In case of the control relay, based on (19) and (27) This way we proved, that the state belonging to the smooth regular sliding line S can be accurately followed by a state trajectory broken in each points consisting of infinitely short sections switched by infinitely high frequency. The solution of (30) is: …”

“…The design of a sliding mode controller (SMC) consists of three main steps. First, the design of the sliding surface the second step is the design of the control law which holds the system trajectory on the sliding surface and the third and key step is the chattering-free implementation [19].…”

Single-Stage Double-Buck Topologies with High Power Factor

“…8). As the ac input current (i rec ) of the double-buck switch-mode rectifier is controlled using on-off switches, the use of sliding-mode approach is advantageous, because sliding-mode controllers easily generate the needed discontinuous control actions and can ensure stability, robustness concerning system parameters and non modeling dynamics [11]- [16], being advantageous over constant frequency current mode control. Since the dynamics of this converter can be divided into fast motion (input ac current) and slow motion (output dc voltage), the output voltage control of this circuit can be controlled using a PI compensator, with gains selected to provide a stable system with good enough steady-state and dynamic responses.…”