1,720,974 research outputs found
Voltage sags effects on the operation of a synchrotron light source: experimental analysis and solution project
No full textPremium Power Park: evoluzione di una soluzione per il miglioramento della Qualità del servizio
No full textIndagine sull’applicazione dei contratti di fornitura a “qualità superiore” e dei cosiddetti “Premium Power Park”
No full textIndagine sui contratti di fornitura a "qualità superiore" e sui provvedimenti da adottare da parte dei Distributori per la loro definizione
No full textSoluzioni innovative di premium Power Park: analisi delle problematiche di funzionamento
No full textInvestigation on different control methods for single-phase DVC
No full textPower Quality (PQ) conditioning in LV distribution networks is an increasing concern within modern power system and Smart Grid systems. Several phenomena have classified in standard, among those, voltage sags and rms voltage drifts have been reported as most significant and frequent ones in both MV and LV distribution systems. Several solutions have been proposed to deal with these voltage disturbances. Dynamic Voltage Restorer (DVR) and Dynamic Voltage Conditioner (DVC) are the most promising solutions. Controlling these series connected devices is a challenge especially in single-phase schema which is an appreciated solution for Distribution System Operator (DSO). This paper investigates difference control strategies for single-phase DVC system. Control methods are explained in detail and MATLAB based simulation results are reported. Investigated control methods performance dealing with example voltage drop event have been reported
Protection devices against DC fault in a back-to-back converter applied to distribution grids
No full textThis paper considers the possibility to connect two medium voltage primary distribution grids through a DC connection realized by two AD/DC converters in back-to-back configuration. In particular, after a description of the whole system, the effects of a bolted or non-bolted DC fault are analyzed. Then, an active current limiter is proposed to limit the fault currents and keep the controllability of the system. Such a system is then modeled and studied through many simulations that confirm the effectiveness of the proposed current limiter
Screening Advanced FACTS and State-of-the-Art Technologies to Improve Power Systems Stability with High RES Penetration
No full textThe progressive and massive penetration of variable renewable energy sources (RES) into electrical grids is introducing new critical issues in power systems around the world. Due to their non-programmability, variable RES plants, that are also devoid of mechanical inertia, may have important repercussions on the stability of the electricity grids, in particular on the regulation of the frequency and voltage. Therefore, the purpose of this paper is to present the State-of the-Art related to some technological solutions capable of supporting the power system stability in scenarios with high RES penetration. In particular, the paper focuses on advanced FACTS (Flexible Alternating Current Transmission System) devices, like STATCOMs (Static Synchronous Compensators), for a comparison with synchronous condensers and supercapacitors. The performance and the technical features of these technologies are screened and evaluated, to identify which solution may be the most suitable for different scenarios
Taylor–Fourier Multifrequency Approach to Power Quality Monitoring in DC Grids
Full text linkDirect current (dc) grids and microgrids represent attractive solutions for the integration of renewable energy sources, storage systems, and chargers for electric vehicles, all requiring power electronic interface converters. However, there is a severe lack of dedicated measurement tools, both from a scientific and normative point of view. The present article proposes to extend the concept of wide-area measurements synchronized with respect to an absolute time reference, like the coordinated universal time (UTC) timescale, to dc distribution, which enables observing the state of the grid, tracking dynamics, and performing power quality (PQ) monitoring, in particular measuring the most significant ripple components. In this respect, a class of algorithms, based on a suitably modified Taylor Fourier multifrequency (TFM) model, has been developed. Two methods for retrieving the frequency components to be included in the TFM model have been compared: a compressive-sensing-based algorithm exploiting the spectral sparsity of the signal and a new approach using the estimation of signal parameters by rotational invariance technique (ESPRIT) and clustering of spectral components. Achieved performance is assessed through numerical simulations that mimic a realistic situation. Results highlight the potentialities of the proposed approaches, which provide highly accurate estimates of the most significant spectral components superimposed to the dc voltage, both under steady-state and dynamic conditions
Implementation of a new method for an improved voltage dips evaluation by the Italian power quality monitoring system in presence of VT saturation effects
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