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This work describes the electrical characterization of CIG(S,Se)2 sub-modules in order to compare the related performances with those obtained from traditional silicon photovoltaic modules. This characterization has been performed through means of a test bench, mainly composed by a solar simulator equipment, allowing the determination of the parameters of the prototypes under test at different irradiances...
The main objective of this paper is to study and analyse the voltage output waveform of a multilevel inverter, to suggest a new approach for harmonic mitigation improving the converter performance. These last type of converters represent a new technology in the field of DC/AC electrical energy conversion, presenting advantages respect to the traditional converters. In fact, the multilevel power converters...
In this paper the Authors give indications for the design of a grid tied Voltage Source Inverters (VSI) aimed to optimal use in energy conversion from wind source. In particular, the design of the inverter is more focused on the control system planning, with a particular glance on the grid synchronization problem. After the exposition of general issues concerning renewable energies and associated...
This paper focuses on railway speed profiles and energy efficiency. It examines the train motion equations and proposes a novel procedure to determine a feasible eco-driving technique. The approach proposes to optimize the energy consumption in a railway route by maximizing the coasting phases. The method is applied by a series of successive steps. It finds the sections where coasting driving is applicable...
DC power distribution systems for building application are gaining interest both in academic and industrial world, due to potential benefits in terms of energy efficiency and capital savings. These benefits are more evident were the end-use loads are natively DC (e.g., computers, solid-state lighting or variable speed drives for electric motors), like in data centers and commercial buildings, but...
The paper discusses on a control algorithm applied to a hybrid PV power system. The hybrid power system is constituted by directly connecting an Electric Double Layer Capacitor (EDLC) device on the dc output bus of the PV Maximum Power Point Tracker (MPPT) converter. The aim of this paper is to propose a control approach applied to the dc power converter able to assure a double set-point regulation,...
This paper deals with the mathematical formulation and implementation of the optimization model for virtual power plants (VPPs). The daily optimized operation of the VPP is focusing on maximizing its benefit, considering VPP comprising renewable energy sources and energy storage systems, thermal engines and demand-response loads. The optimization model is tested considering two case studies of average...
RF-harvesting energy is the process of scavenging power from electromagnetic fields at radio frequency band. By RF-harvesting technology, we are able to recycle EM-fields and use them as power supply for electrical devices. The significant advantage of this technology is the reduction of electromagnetic pollution existence in the free space from wireless radio networks, cell phone towers, TV signals,...
The paper proposes an application of an optimization evolutionary technique, improved Differential Evolution, to reactive power planning. This problem could be formulated mathematically as a nonlinear, non smooth, mixed-integer, multi-objective optimization problem. The main objective deals with the minimization of the real power losses that result in a better reactive power dispatch and improving...
Nowadays, the delivery of electrical energy with high power quality to the supplied customers is required. Voltage quality and continuity of supply represents an important aspect of future smart grids. The present paper proposes a dc power system standalone or grid connected, applying advanced power control techniques, supplied by distributed generators: wind turbine, photovoltaic panel, storage battery,...
The high capacity arc furnaces connected to the high voltage level create fluctuations in source voltage at the point of common coupling. These voltage fluctuations then propagate throughout the power system to the low voltage level, with different degrees of attenuation. The propagation of voltage flicker in the power system requires real practice measurements on which the analysis of customer perturbation...
This paper considers the harmonic supply voltage evaluation of non linear distorted loads, such as diode bridges, arch furnaces and so on, connected to medium voltage cable line. The connection to the MV grid allows a cost reduction of the measuring and protection apparatus, but it introduces problems such as the low short circuit power that can cause a high harmonic voltage distortion. The paper...
This paper present an application of Differential Evolutionary Algorithm (DEA) with the purpose of finding the optimal location of a renewable source in a electric power network. In addition, the paper considers also the problem of optimal reactive power dispatch (ORPD), minimizing the active power loss and improving the voltage level. The DEA is used as an optimization technique being highly efficient...
The growth of equipments incorporating nonlinear elements in the power system imposes to adopt efficient measures for limiting the current and voltage waveforms distortion. The paper deals with the determination of the values for the summation coefficient for the 5, 7, 11, and 13 harmonic orders.
This paper deals with the interferences between the new 2times25 kV - 50 Hz Italian High Speed/High Capacity railway lines and the 3 kV regional system. In particular, the interconnection between the two supply systems has been investigated by modeling all the appliances in the border region. Many simulation results are presented and discussed in order to evaluate the efficiency of the solution adopted...
The paper deals with the analysis of the new combined heat cooling and power (CHCP) systems, considering a real installation in a plastic film industry. The major aim of the paper is the evaluation of the short-circuit currents in the main power center that supply the system. These values are really significant, because the presence of distributed generation (DG) systems connected to the distribution...
The interconnection of wind sources characterized by a significant variability of generated power and the continuous growth of installed power in wind farms raises a number of specific problems both to the utilities and to the power system operator. One of these issues is to ensure the safe operation of the power system when the reduction of the wind generated power occurs. The compensation of not...
Nowadays, wind generation is developing in the whole world. In conformity with the Romanian present regulations, the wind energy producers must obtain the technical interconnection approval, which consists in the documents presented to the transmission grid operator: an interconnection study for the wind turbines, urbanism certificate, and the property certificate. As the wind turbines are increasingly...
The manner in which we produce and consume energy is of crucial importance to sustainable development, as energy has deep relationships with each of its three dimensions - the economy, the environment and social welfare; energy is part of many environmental problems, including climate change, and must be part of the solution. Renewable energy increases diversity of energy supplies and can replace...
The random load variation, as in case of the arc furnaces, determines random voltage variations at the supply bus-bars., the can affect the power quality delivered to other customers, supplied by the same bus-bars. The value of the instantaneous flicker sensation S(t) is measured by means of an instrument, the so-called flickermeter. The setting-up of the flickermeter model is done in Simulink, the...
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