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This article argues in favour of using visual attention mechanisms on off-road robots and of exploiting the social insects metaphor for their robust implementation. Visual attention helps these robots focusing their perceptual resources on a by-need basis when dealing with the complexity of unstructured environments. However, focusing perceptual resources is a hard problem given the well known speed-accuracy...
this paper analyzes the PV power plants operability improvement obtained when introducing energy storage (ES) systems which allow decoupling the power received from the sun on the photovoltaic (PV) panels from the power injected by the power plant into the grid. Two energy management strategies are presented and analyzed, using Li-ion batteries as the energy storage buffer. The generated power redistribution...
In this paper it is presented control system of distributed energy resources (DER) based on Ethernet POWERLINK Protocol. Authors develop a common method for communicating with The Inverter-Based Microgrid System. This paper presents the optimal storage sharing control method of grid connected generation system. This system consists of photovoltaic panels (PV), windmill with induction generator (WG),...
Sliding mode control (SMC) methods rely on applying a high-frequency switching control. In networked control systems (NCS), high-frequency operations/transactions are not desirable because communication bandwidth consumption increases dramatically. This paper studies the application of event-driven self-triggered techniques to sliding mode control over networks as a means for reducing the bandwidth...
In the paper, the performance of the sampling algorithm as a measure that evaluates together the sampling cost and the sampling accuracy is introduced and analyzed. We define the sampling cost as a number of samples in a unit of time and respectively the sampling accuracy as the mean intersampling error. On the basis of the sampling scheme performance measure, we compare the pure send-on-delta scheme...
Tidal currents are being recognized as a resource for sustainable electrical power generation. However, the main challenge for marine current energy development is to minimize the operation costs and maintenance operations in the marine harsh environment. These worries are justified by the incident high rates on offshore wind turbine systems. Marine current turbines are characterized by a very difficult...
Nowadays Photovoltaic (PV) plants have multi MW sizes, the biggest plants reaching tens of MW of capacity. Such large-scale PV plants are made up of several thousands of PV panels, each panel being in the range of 150–350W. This means that the design of a Large PV power plant is a big challenge and configuring such a plant should be implemented taking into consideration not only the cost of the installation,...
This paper presents a fuzzy controller for improving Fault Ride-Through (FRT) capability of variable speed wind turbines (WTs). The controller is designed in order to compensate the voltage at the point of common coupling by controlling the active and reactive power generated by WTs. Simulations are carried out on a real 37-bus Italian weak distribution system. The results show that the proposed controller...
This paper presents research motivated by industrial demand for energy storage system for city transport vehicles. The kinetic energy is accumulated into the supercapacitor during vehicle braking. This energy can be used to accelerating again. It is important to save the energy in the vehicles, which accelerate very often.
The increasing penetration of Distributed Generation (DG) and emerging smart metering technologies are transforming passive distribution networks into active distribution networks. In such active networks, extensive monitoring and remote control technologies are essential. Extensive research is ongoing with regard to the development of novel Distribution System State Estimation (DSSE) tools for improved...
The performance analysis of wireless industrial communication systems could be significantly improved by introducing adequate models of the employed real components obtained through experimental measurements. In this paper we present an example of characterization of the elaboration delay introduced by a commercial access point. The pdfs of such a delay, obtained under different traffic conditions,...
This paper presents a concept design of a hybrid renewable energy system (HRES). The proposed HRES design specifies the operation of the following units: a pumped-storage hydro power plant, a wind power plant and a solar power plant. Since the pumped-storage hydro power plant represents the most complex entity of the HRES, special emphasis is placed on its two control loops: the water tank level control...
This paper presents a Low Power Wind Generation System based on a permanent magnet synchronous generator and a High Power Factor rectifier. To achieve a high power factor in the generator side, it is proposed a power processing scheme that uses a passive rectifier and a DC-DC converter working in discontinuous conduction mode. This circuit is known as a boost rectifier. The proposed generator control...
This paper presents a complex design of Small Wind Turbine with AC/DC converter containing Maximum Power Point Tracking Algorithm. The paper describes a general issues, phenomenon and problems connected with designing particular parts for small wind turbine, such a generator or wind rotor. In addition, it shows short discussion between two different Maximum Power Point Tracking approaches, simulation...
This paper compares the performance ratio of Photovoltaic (PV) plants using central and distributed inverters. A Single Diode Model is selected to simulate the electric behavior of PV-modules, including the dependences with environmental conditions. With the aim of reducing computational costs and avoiding complex mathematical resolutions, a graphical method is developed by the authors to estimate...
This paper proposes a method for locating a fault in a radial distribution network using travelling waves together with network theory. The single-ended travelling wave measurement scheme is used to calculate the distance of the fault from the terminal node. However, due to the radial structure of the distribution network, there could be more than one possible fault candidates at the same distance...
Grid interface units, namely inverters, can be used to function as primary controllers for distributed energy resources (DERs). To decrease the costs of the DERs integration in Smart Grids, two new functionalities added to the inverter are proposed in this paper. The first is the metering to count for the injected power into the grid and hence the inverter shares in business-related functions, which...
In the robotic area, robot will take some actions depending on gender or person. For example, according to gender, robot can change different listening-modes for voice recognition to improve recognition accuracy. Besides, we can recognize face based on gender to change predicting model from male or female database. Therefore, we develop a Human-Robot interaction through gender recognition. In this...
Direct sequence spread spectrum (DS-SS) technique is widely used in modern telecommunications and it represents the latest advancement in radio control systems. In this paper we present an optimization of DS-SS scheme for unmanned aerial vehicle (UAV) pulse position modulation (PPM) control signal protection based on two-level detection. A novel framework for Bayesian detection while keeping false...
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