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This paper proposes a control strategy for the distributed generation based on isolated system, which consists of diesel generator, photovoltaic (PV)generator and battery. The diesel generator is used being a main energy source, but the photovoltaic generation is chosen as an additional power source due to the growth of the load demand and for establishing an isolated microgrid. The control of microgrid...
This paper aims to forecast the photovoltaic power, which is an important and challenging function of energy management system for grid planning, scheduling, maintenance and improving stability. Forecasting of photovoltaic power using Artificial Neural Network (ANN) is the main focus of this paper. The training algorithm used for ANN is Extreme Learning Machine (ELM). Accurate forecast of Renewable...
This paper proposes a battery energy management system (BEMS) for photovoltaic (PV) powered micro-grid, where the system would like to reduce the operational time of diesel generator (DG). Due to fast variations in the solar irradiance, the BEMS need to smooth the PV power fluctuations. Hence, an energy storage system is required to mitigate the PV power fluctuations. Novelty of this BEMS is to manage...
In this paper, a control of a photovoltaic system connected to the grid is presented. The main components of the studied system are solar arrays connected through a DC bus to a grid side inverter. Due to the instantaneous changes of solar irradiance and temperature, maximum power point tracking (MPPT) is integrated in the inverter control. The energy generated by the grid photovoltaic system is sent...
Photovoltaic plants are complex systems operating in variable conditions. Their performances can be deteriorated by many factors such as shadows and mismatch phenomena. In this case, a suitable device able to control and condition the produced power is needed. A power optimizer could represent an adequate solution since it is capable of regulating the PV generator output impedance to reach the maximum...
This paper presents the application of a mathematical algorithm based on the gradient method [1] to solve optimal power flows (OPF) in electrical microgrids with photovoltaic generation in order to improve the voltages profiles and consequently reduce the active power losses. The generation and storages devices were modeling by dynamic curves and the algorithm was implemented in a two electrical microgrids...
This paper proposes a method of extracting the intrinsic parameters of a Photovoltaic (PV) generator by using Shuffled Complex Evolution (SCE) technique for a single-diode PV model. The characteristic equation of a single-diode PV generator presents a nonlinear behavior, which its solution to obtain the intrinsic parameters from an I × V experimental curve requires to use nonlinear optimization methods...
The paper presents a novel, original control strategy in order to increase the efficiency of the renewable energy systems. The proposed algorithm uses the Extremum System framework, continuously adjusting the manipulated variable in order to maintain the output as near as possible to its extreme value. The maximum point seeking algorithm is an original, simple one, based on the analysis of the slope...
The worldwide increasing demand for electricity, coupled with governmental policy changes for "green" energy has led to significant interest in distributed generation (DG). Integrating DG into an electricity network, especially close to load centres, has many significant benefits but also brings with it many drawbacks such as voltage drop, and power losses. In this paper the impact of three...
Appropriate operating conditions allow to take advantage of the resources more efficiently, in particular, in electrical systems whose thermal generator fleet may affect the ecosystem. Within this context, a Particle Swarm Optimization in DIgSILENT software is proposed to determine appropriate settings for the elements to control the reactive power. This algorithm reduce the active losses which implying...
This paper presents a methodology and a computational tool developed for the assessment of the impacts caused by photovoltaic and wind generators, up to 100 kW, connected to the distribution networks, and aims at a real network application. The impact on the power distribution systems planning derive from the new network configuration caused by the installation of distributed generators and the demand...
In this work, we model a low-power microgrid based on the distribution grid of the University of Nariño, Colombia. The model includes photovoltaic, wind, microturbines, and fuel cell generators to satisfy the demanded power in the campus, according to measured demand profiles in the low voltage side. The design and simulation are performed in SimPowerSystems simplifying the low-level controllers to...
The mathematical model of a single photovoltaic cell is used to built a numerical simulator of a residential solar generator. For the city of Santa Fe (Argentina), the following is analyzed: i) weather information on solar irradiances and ambient temperatures collected along the years 2008–2014; ii) the effect of the orientation assigned to the solar panels; and iii) the average household electricity...
In this article, the problem of allocation of photovoltaic generators in a distribution network while losses are minimized considering network operating constraints is formulated and solved. Three formulations are considered. In order to take into account adequately the imbalance of distribution networks, a three-phase approach is considered. To solve the three formulations a stochastic algorithm...
Uncertainties in distributed generation with renewable sources, and load fluctuations due to demand response, require the Distribution System Operator to have tools to coordinate supply and demand with an adequate quality of service. A cost optimization method is proposed for this purpose, based on two time-scales: a slow scale were topology changes and transformer taps are varied with their operation...
The number of photovoltaic distributed generators introduced into electricity distribution systems is increasing worldwide. Safety measures must be taken for the correct operation of these new distributed generators so as to prevent uncontrolled and undesired power injections into the grid and possible damages to equipment and personnel. This paper describes an anti-islanding detection method used...
Energy storage systems integration with large-scale PV power plants, named Intelligent PV power plant (IPV), could contribute to improve the viability of these plants and to provide ancillary services to the main grid. The number and extension of the provided services depend not only on the size of the storage system, but also on the manner how this storage system is managed. In this paper the market...
Microgrids that are able to work both in grid-connected and islanded modes need a hierarchical structure based on tertiary, secondary and primary controllers, which are fundamental for the maintenance of frequency and stability. In this paper, two types of controllers are formalized and solved as optimal control problems: tertiary and secondary controls. For secondary control two different scaled...
Hybrid Renewable Energy Complementary Systems are gaining popularity as electricity power generation system. The Hybrid Renewable Energy Complementary Systems introductory was to overcome the intermittency during the energy harvesting process. Therefore, solar photovoltaic and wind turbine generator has been seen as one of the most promising Hybrid Renewable Energy Complementary System to overcome...
Algeria is one of the countries that is characterized by sunny days due to its climate diversities, which make it favourite to solar applications. Most of its areas are arid and semi arid. Supplying them by a conventional grid is costly due to their remoteness and dispersion of sites. Diesel engines are not efficient because of the high transporting cost of carburant and engines maintenance. So, solar...
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