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Distributed Energy Resources (DER) connected to distribution grids through static power converters may have major impacts on Power Quality (PQ). For this reason, power converters used as Universal Compensators (UC) are gaining more and more interest. This paper describes the design, modeling and study of a shunt static compensator for Low Voltage distribution grids. The proposed device can be used...
This paper presents a case study from a project in Arusha region (north Tanzania), aiming at improving access to electricity in secondary schools through the establishment of a social enterprise, in charge of promoting rural electrification by applying the “4As Framework” with an innovative way and business structure. The work highlights benefits and challenges from the field, in order to drawn some...
Power Quality within LV distribution and Smart Grid systems is an important issue. Open Unified Power Quality Conditioner (Open UPQC) is a possible solution to improve power quality level within distribution smart grid networks. This paper presents the ICT-based power control in order to manage cooperation between series and shunt units of Open UPQC. The cooperation is meant to improve system functionality...
The increasing exploitation of Renewable Energy Sources (RES) is progressively displacing large conventional power plants, thus reducing system operating reserves and stability margins. Therefore new resources for ancillary service provision are needed. Very fast and flexible response capabilities make Battery Energy Storage Systems (BESS) good candidates to this purpose. However, the related cycling...
With decreasing generation of central conventional power plants and increasing number of decentral renewable energy sources (RES), there is arising discussion on distribution grids providing flexibility in terms of control of active and reactive power exchange at connection points to higher voltage grids by control of RES. In this work, a new methodology is developed to estimate flexibility potential...
The share of decentralized power generation is increasing, which causes general changes and challenges for the conventional power system. Hence, distribution system operators (DSO) need new technologies to ensure the stability of the entire electrical power system. As a feasible solution for structuring power networks, the Clustering Power System Approach (CPSA) has been introduced, providing an innovative...
This paper aims to present some applications of Wavelet Transform (WT) in grid-connected photovoltaic (PV) systems, main differences among Wavelet transform and Fourier transforms and also some aspects related to power quality (PQ) and islanding detection methods in a grid-connected PV system. An example of Discrete Wavelet Transform (DWT) applied to detect disturbs on electrical signals is also presented...
Dye Sensitized Solar Cells (DSSCs) are widely considered one of the most promising third generation photovoltaic devices, especially thanks to their relatively low cost if compared to conventional solar cells. An interesting phenomenon affecting such devices is the so-called light soaking effect, consisting in the increase of cell main electrical parameters after the exposition to solar light. In...
This paper presents the comparison between the cogging torques produced by four IPMSGs (Interior Permanent Magnet Synchronous Generators) with different stator winding configurations. More in detail, an IPMSG model, which is derived from a commercial geometry, is analyzed through means of a FEM (Finite Element Method) approach. Then, three more structures are determined and analyzed by adequately...
In this paper, we have analyzed the performance of rotating Photovoltaic (PV) modules integrated with an H- type vertical-axis wind turbine (VAWT) consisting of five blades. The PV modules used are flexible monocrystalline thin films. The importance of the proposed design over the conventional photovoltaic wind-hybrid systems are: first, it combines the turbine with PV modules resulting in a reduced...
Municipal waste management has a great impact on the sustainability of human processes and green policies, especially in urban sites. Although it could be achieved the full separation of the reusable and recyclable items and the complete elimination of the organic material present in it, many waste components must still be processed in waste treatment facilities. Accordingly, since the 90s, in Spain,...
HEART - an innovative EU H2020 funded project - recently took off with the goal of concretely tackling technical, economic and social aspects related to climate change and building energy consumptions.
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...
In this paper the performance of a maximum power point technique, which is suitable for photovoltaic applications to sustainable mobility, is documented. The approach is based on the use of one DC/DC converter per sub-section of the photovoltaic array, with a central controller that changes the duty cycle of each DC/DC converter in a way that the current injected into the battery is maximized. The...
Although the conventional P&O method may be trapped into a local maximum point under partial shading conditions, it is a very fast algorithm because it is a deterministic algorithm and simply rely on the fact that the maximum point is reached when dPpv/dVpv = 0, where Ppv and Vpv are the power and voltage of the photovoltaic arrays, respectively. Hence, it is highly desirable, under partial shading...
This paper presents a novel low-cost photovoltaic (PV) microinverter with an ultra-wide MPPT voltage range. This approach is based on the two-stage energy conversion where the front-end boost half-bridge DC-DC converter is used to step up the fluctuating PV voltage to a stabilized high DC voltage, which is next transformed to a grid compliant AC voltage by the grid-tied inverter. The operation principle...
This work is focuses on the study and the development of a Circuit Breaker (CB) for photovoltaic applications according with the state of the art and standards. The proposed CB is composed by a Solid State Power Controller (SSPC) and a dedicated Digital Signal Processing (DSP) for the real time protection. The DSP communicate via CAN BUS with the main computer to set the protection curve and to remotely...
Photovoltaic (PV) energy production has become more and more important in the latest years. The need of energy efficiency pushed the research in this field both on material innovation and system management. As well known, an essential task in a PV system is performed by the tracking algorithm that has to assure the maximum power generation of the system. Many Maximum Power Point Tracking (MPPT) techniques...
This paper looks into the modelling of the ACUREX distributed solar collector field at the Plataforma Solar de Almería (PSA). ACUREX possesses resonance characteristics that lie well within the desired control bandwidth and quite commonly is modelled by dividing the receiver tube in the solar collector field into a number of segments. However, the number of segments has varied significantly in the...
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