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• W2184305513 abstract "In this paper we concern about implementing nonlinear Fuzzy controller which regulates the modulation index of voltage source converter (VSC),which is used in an uninterrupted power supply (UPS) application, to control Volt/Var in the grid. The UPS controls the voltage at the point of common coupling (PCC). A LC filter is linked at the output of the VSC to eliminate switching harmonics. In the fuzzy controller the value of modulation index of VSC, is determined from a fuzzy 0r ef rule-base defined on PCC voltage error(e=V -V ) of the point of common coupling. The proposed fuzzy controller is designed using simple control rule-base and the most natural membership functions. The comparative performances of the proposed fuzzy controller and the conventional PI controller, have been investigated through wide range of operating condition such as harmonics, unbalancing and voltage sag/swell. From the simulation studies it has been found out that the performance of the proposed fuzzy controller is better than that obtained by the conventional PI controller. phase, and an unbalanced filters output voltage (v ) was happened. The VSI topology to supply three and single phase AC loads, require a neutral connection to feed each phase voltage independently, as shown in Fig. 1. Voltage unbalance can interrupt or even damage some three-phase loads. For instance, under unbalanced voltage, three-phase current of the induction machine can be highly distorted and current in one phase can be higher than the nominal value. In addition, over-voltages will damage the insulation of a stator winding. These can shorten the motor's life. Thus, international standards prohibit too high voltage unbalances. So regulation sinusoidal voltages have gained substantial attention over the last few years. In addition, the concern for global warming has seen considerable evolvement in the distributed generation (DG) technology in the recent time. An uninterruptible power supply (UPS) can give solution for the power quality problem such as harmonics, unbalancing, voltage sag/swell, while supplying clean power from DGs simultaneously. Generally UPSs are used to provide low distortion, battery back up to computers, regulated sinusoidal voltages to critical loads such as data-processing, communication, and medical electronics systems. UPSs can be off-line type in which they remain unemployed until power outage occurs and start supplying power subsequently. The on-line type UPS continuously powers the protected load from its reserve while synchronously resupplying the reserve by drawing power from the utility supply. In this paper, the application of the UPS has been extended. It is assumed that the UPS is fed by a distributed generator. The DG can be a PV stack or fuel cell stack or battery which supplies the dc bus of the voltage source converter (VSC) connecting the UPS to the ac network, and assumed that the UPS is connected at the point of common coupling (PCC) of the utility and a major load center. A PWM inverter is used to supply the load, a LC low-pass filter must be used to eliminate the switching frequency component of output voltage harmonics. The cut off frequency of this filter is set 500Hz and the switching frequency of this PWM inverter is set 1kHz. The model of this PWM inverter with L-C filter is shown in Fig3." @default.
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• W2184305513 date "2010-01-01" @default.
• W2184305513 modified "2023-09-27" @default.
• W2184305513 title "A New Approach Based on Fuzzy Controller for Volt/Var Control in Distribution System" @default.
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