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The problem of analysing harmonic and interharmonic distortion in multiconverter industrial power systems is considered. An useful updating of the iterative harmonic analysis algorithm to include interharmonics, based on automated EMTP simulations of nonlinear loads, is presented and its capabilities are discussed, also in the perspective of utilisation in a distributed computing environment.

The problem of analysing harmonic and interharmonic distortion in multiconverter industrial power systems is considered. An useful updating of the iterative harmonic analysis algorithm to include interharmonics, based on automated EMTP simulations of nonlinear loads, is presented and its capabilities are discussed, also in the perspective of utilisation in a distributed computing environment.

ABSTRACT The paper presents a simple technique for correctly and fastly tuning the slip gain in Indirect Field Oriented Control drives. To this aim no other transducers than the tachogenerator, usually included in such drives, are needed, as the tuning operation is performed by processing the effects of a suitable test signal injected in the system. The proposed approach can be used either for on-line retuning of working drives, either for the initial tuning of new installed drives. Simulation and experimental tests show that the procedure is effective and does not Interfere with normal operations of the drive.

ABSTRACT The paper presents a simple technique for correctly and fastly tuning the slip gain in Indirect Field Oriented Control drives. To this aim no other transducers than the tachogenerator, usually included in such drives, are needed, as the tuning operation is performed by processing the effects of a suitable test signal injected in the system. The proposed approach can be used either for on-line retuning of working drives, either for the initial tuning of new installed drives. Simulation and experimental tests show that the procedure is effective and does not Interfere with normal operations of the drive.

Abstract Step-up transformers are exploited to connect large PV plants to the utility network, their sizing being often accomplished only taking into account the PV plant peak power. In the present paper a general design methodology is proposed to optimally select the size of these transformers on the basis of the statistical distribution of the solar irradiation in the selected site and the mathematical model of the plant. It is based on a probabilistic approach based on the evaluation of the so called LPPP (Loss of Produced Power Probability) index. Taking into account full life costs the proposed approach is exploited to find the optimal transformer size for a grid connected 2 MW PV plant located in different geographical sites. Moreover, the effect of the introduction of energy storage systems in the PV plant is also evaluated.

Abstract Step-up transformers are exploited to connect large PV plants to the utility network, their sizing being often accomplished only taking into account the PV plant peak power. In the present paper a general design methodology is proposed to optimally select the size of these transformers on the basis of the statistical distribution of the solar irradiation in the selected site and the mathematical model of the plant. It is based on a probabilistic approach based on the evaluation of the so called LPPP (Loss of Produced Power Probability) index. Taking into account full life costs the proposed approach is exploited to find the optimal transformer size for a grid connected 2 MW PV plant located in different geographical sites. Moreover, the effect of the introduction of energy storage systems in the PV plant is also evaluated.