Search results for: P. Caramia
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International Journal of Electrical Power & Energy Systems > 2017 > 93 > C > 204-215
A high penetration of Photovoltaic (PV) systems into power networks can alter the fault currents and negatively impacts on the operation of the protection systems. In this paper, a new analytical model of the fault contribution of a three-phase PV system equipped with a voltage source converter is proposed. Such a model extends the classical steady-state short-circuit analysis to balanced active power...
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This paper focuses on automatic control systems for train application. The analysis starts examining the grades of automation in train service application, and focuses on the tasks, which are typical for Automatic Train Operation (ATO) systems. After the presentation of the analytical statement of the problem, a brief survey on the more recent proposals for designing ATO systems is illustrated. The...
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This paper proposes a procedure for detecting the optimal speed profile of a metro vehicle. The proposed approach provides an energy-efficient driving in terms of optimal speed profile. The speed profile is obtained through the solution of a single objective optimization problem based on the minimization of the train energy consumption while satisfying specified technical and operating constraints...
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In this paper an optimal strategy is proposed for the real time control of a hybrid microgrid (μG). Hybrid μGs are characterized by the presence of two sections operating in alternating current (AC μG) and in direct current (DC μG), respectively. They include dispatchable and non-dispatchable renewable generation units, battery energy storage systems and controllable loads. These different resources...
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The management of micro grids requires the dynamic harmonic state estimation of the system in order to perform control strategies that optimize waveform distortions. In industrial context, AC and DC devices and sources coexist and, therefore, micro grids can be a hybrid combination of AC and DC power sections. Also for such hybrid AC/DC micro grids optimal control strategies that optimize waveform...
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This paper proposes a model to the optimal management of a complex DC microgrid with advanced forecasting method for photovoltaic generation. The strategy is aimed at minimizing the daily total energy cost using a very short-time predictive control procedure. At first, the predicted power of the renewable generation unit is obtained by using an innovative forecasting approach based on the Bayesian...
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This paper deals with the very short time predictive control of a hybrid microgrid (μG). The hybrid μG is characterized by the presence of two sections operating in alternating current (AC) and in direct current (DC), respectively. The proposed very short time predictive control is based on an optimal strategy focused on the coordination of loads and energy resources and aimed at minimizing the cost...
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International Journal of Electrical Power & Energy Systems > 2015 > 67 > C > 25-38
Microgrids include distributed energy resources, controllable loads, and storage devices, and they can be classified into AC and DC types, depending on the characteristics of the supply voltage. In this paper, an optimal control strategy for a DC microgrid is proposed, and the strategy is aimed at minimizing the daily total energy costs. The DC micro grid can include non-dispatchable generation units...
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There is an increasing interest in standards and technical literature to the probabilistic characterization of voltage and current harmonics in multi-convertor power systems. The characterization requires to express the input data of the harmonic penetration modelling by random variables and to apply probabilistic techniques of analysis. Among probabilistic approaches, Monte Carlo simulation is widely...
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The sensitivity to Power Quality (PQ) disturbances is today increasing in micro grids due to the great economic consequences that PQ disturbances can generate. However, micro grids include several distributed energy resources (DER) interconnected to the grid with static converters that can deteriorate the Power Quality levels. Among DER, wind turbine systems (WTSs) are expected to be widely employed...
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This is a companion paper to a paper of the same title, Part I, in which the theoretical aspects of some spectrum estimation methods for the analysis of non-stationary waveform distortions in power systems due to Wind Turbine Systems (WTSs) are analysed. In particular, Part I dealt with sliding window (SW) DFT, some parametric methods (SW Prony and ESPRIT) and some hybrid methods (SW ESPRIT-DFT and...
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Microgrids 1 are electrical subsystems which include small generation units, storage devices and loads, which can operate either in grid connected or islanding mode. This paper deals with a DC microgrid that will be realized in an Italian industrial facility of GETRA Group. In particular, in this paper an optimization model is formulated to solve the problem of the day-ahead optimal scheduling of...
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Discrete Fourier Transform (DFT) and high-performance signal-analysis techniques (i.e., Prony, ESPRIT, root-MUSIC methods) have been proposed to calculate Power Quality indices that characterize waveform distortions in power systems. DFT can be affected by spectral leakage problems that cause inaccuracies in the spectral component calculation while high-performance signal-analysis techniques usually...
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The paper presents a probabilistic approach based on a Monte Carlo technique for the evaluation of the probability density function of three phase short-circuit currents in a distribution network with distributed generations. The proposed approach takes into account all the major uncertainties affecting the magnitude of the fault currents: power load demands, network configurations, fault location,...
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In this paper, we propose a new method for the accurate estimation of frequencies and magnitudes of harmonics and interharmonics caused on the supply-side currents by an adjustable-speed drive. The proposed method consists of a three-step procedure in which Estimation of Signal Parameters by Rotational Invariance Technique (ESPRIT) and Prony high-resolution methods are properly applied together with...
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Electrical power system robustness is defined as the intrinsic capacity of an electrical power system to maintain assigned disturbance levels when external conditions change. In this paper the concept of robustness against is applied to the voltage dips, one of the most severe disturbances in power quality. Using graphical color schemes as immediate tools, improvements and/or degradations of the electrical...
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In this paper, the point estimate method is applied to account for the uncertainties that affect the evaluation of the steady state operating conditions of an unbalanced three-phase power system in the presence of wind farms. The accuracy of the proposed technique is tested on the three-phase unbalanced IEEE 34-bus test system adequately modified to take into account the presence of wind farms; the...
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Power quality (PQ) regulation is of great importance due to the economical consequences associated with the presence of the disturbances in power systems. Regulations should provide interventions at the system level (transmission and distribution networks) and the local level at the point of common coupling between utilities and customers. This paper proposes an integrated approach for overall voltage...
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This chapter contains sections titled:
Introduction
Single‐site indices
System indices
Conclusions
References
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This chapter contains sections titled:
Introduction
Probabilistic direct method for network analysis
Probabilistic harmonic power flow
Probabilistic iterative harmonic analysis
Conclusions on methods for network analysis
References
