M. Popescu, A. Bitoleanu, M. Dobriceanu, and M. Linca (Romania)
Power quality, simulation, electrical drive, and static converter
The system structure and parameters, simulation, analysis and displaying capabilities are carried out via pull-down menus, push buttons, radio buttons, popup menus, context-sensitive menus, check and dialogue boxes, etc [4]. This paper introduces the facilities of a new graphical user interface named SEATED for power quality assessment in induction motor and static converter driving systems. It is based on a Matlab/Simulink library created to this end and allows an easy structure and parameters setup. Power quantities and power quality indices are evaluated from the instantaneous values of the voltage and current signals after the system operation simulation up to all imposed steady state operation points. The steady state analysis can be carried out for each steady state operation point both at the network side and at the motor side. For the quantities for which there are more computing possibilities according to the actual powers teories under non sinusoidal conditions, several definitions were taken into consideration such as Budeanu definitions, Czarnecki definitions and phasorial theory. In the display window, the appropriate option can be selected from a popup menu. As an example, a case study of the electrical drive with induction motor and harmonics cancellation inverter fed by a three-phase rectifier is presented. The simulations followed by power quality assessment can be used as educational tools in order to find both the system parameters influences and control strategies influences on the power quality performances. The attention in the paper is mainly drawn to the description of the most important graphical tool capabilities for power quality assessment. 2. SEATED – main features When the SEATED tool is invoked, a start-up window appears and allows the user information on the main facilities of this tool as shown in Figure 1.
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