![]() The outer-loop regulates the DC output voltage up to small size ripples. The estimation is only based on the online measurements of DC output voltage. The inner-loop ensures the PFC objective and involves an adaptive observer estimating the grid phase currents, the magnitude of the parameters grid phase voltages and the load resistance. The problem is dealt with using a cascade nonlinear adaptive controller that is developed making use of the Lyapunov control design technique. It can be used to determine the varying strengths, loads and tensile strength of a particular material. ![]() It is used to test the tensile strength and compressive strength of materials during the research and development phase of a products design. The considered control problem entails several difficulties including: (i) the numerous state variables that are inaccessible to measurements (ii) the uncertainty that prevails on some system parameters. A tensometer is, as the name alludes to, a universal testing machine designed for material testing. A small cylinder of material can be placed between the discs. The attachment shown is mounted in the tensometer at each end. This is because with the correct attachments it can simulate other tests, such as compression tests. The control objective is twofold: (i) ensuring a satisfactory power factor correction (PFC) at the grid-UPS connection (ii) guaranteeing a tight regulation of the DC output voltage despite of load uncertain. The Hounsfield tensometer is occasionally referred to as a universal testing machine. ![]() ![]() In this paper, the problem of controlling three-phase boost power converter is considered for charging the battery in uninterruptible power supply (UPS) systems.
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