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This paper analyses the key benefits of a multiple paralleled diesel generator system over a “Single” diesel generator system for supplying small remote and isolated loads. Even though having several small diesel generators in parallel instead of one larger one will certainly induce higher capital cost of the generating unit, the resulting cost of kWh generated as well as the system is life cycle...
This paper presents the permutation of rate of change of under frequency (ROCOUF) relay to avoid the frequency instability and voltage collapses in microgrid. When some of distributed generators (DGs) in a microgrid are disconnected from the main grid, the system may be imbalance between the power supply and the power demand, resulting in a rapid frequency decline that causes frequency instability...
A new energy management approach for a hybrid renewable energy system composed of photovoltaic panels, batteries bank and a diesel generator is proposed. The approach is implemented using Fuzzy-Logic algorithm. The approach depends on predicting the generated photovoltaic power and the load forecast every two minutes. This management scheme exploits efficiently all produced renewable energy and available...
Circuit-equivalent battery models are considered defacto standard for modeling and simulation of digital systems due to many practical advantages. In spite of the many variants of models proposed in the literature, none of them accounts for one important feature of the battery dynamics, namely, the dependency on the frequency of current load profile. For a given average current value, current loads...
In off-grid mode operation, electricity supplied by photovoltaic panels and batteries are not usually efficient to meet the load power demand at any time. Thus, a diesel generator (DG) source is necessary as a backup in order to cover the load needs at any time. However, the diesel generator requires a time to reach its steady state operation. Thus, turning ON the diesel generator must not wait the...
In this paper, a power management and control strategy is developed for a hybrid energy system that is composed of a photovoltaic generator, a battery bank and a diesel generator. It supplies a water pump system in a remote area. A power management method is designed to manage the power between the mentioned energy systems in order to obtain the desired water flow and to reduce the using of diesel...
A stand-alone power system is an autonomous system that supplies electricity to the user load without being connected to the electric grid. This kind of decentralized system is frequently located in remote and inaccessible areas. It is essential for about one third of the world population which is living in developed or isolated regions and has no access to an electricity utility grid. The most people...
In this paper, a new three input ports generation system with open-winding generator for wind/solar hybrid generation system is proposed. By using an open-winding topology can save a set of full-controlled power electronic device, which simplifies the structure and increases the system reliability. In order to maintain the generating efficiency of PM generator, d axis current is set to zero, battery...
In most developing countries, for the proper utilization of solar energy the system designed should be optimized. This paper presents the design and analysis of photovoltaic (PV) system to supply electricity. A stand-alone optimization simulation model is developed using the HOMER software. The radiation data for Baru Sahib, H.P. is collected for the every month of the year. Simulation model is used...
Energy is very important for a country for both its economic growth and socio-economic development. The main source of energy is fossil fuels. However, the use of fossil fuels has severe effects on environment like emission of greenhouse gasses. These diverse effects have leads to the demand of renewable energy resources. Renewable energy sources like wind, solar, hydro based energies, etc. are environment...
The problematic is to study the management of a hybrid energy system, depending on demand, dedicated to self-governing houses. Energy can be supplied by a photovoltaic panel, a wind turbine and a diesel generator and it can be stored in batteries. The study of this type of systems requires a good control strategy and an effective management. The main objective of this study is to develop a reliable...
A mechanical circuit has been demonstrated that harnesses squegging to convert −50dBm of input continuous-wave (CW) energy into a local 1-kHz clock output while consuming three orders less local battery power than a typical real-time clock (RTC). Unlike a previous clock receiver that relied on a modulated RF input, this clock generator converts a CW input — no modulation needed — to a clock output...
PHEVs with ability of grid connection in addition to decreasing in dependence on fossil fuels provide stability, voltage control and frequency control. Charger for PHEVs includes a bidirectional AC-DC converter which followed using a bidirectional DC-DC converter. In this article a proper structure for bidirectional switching converter of PHEV is proposed. The solution proposed in this article has...
With continuous depletion of conventional sources of energy, Wind Energy Conversion Systems (WECSs) are turning out to be one of the major players with immense potential to meet the future energy demands. These WECSs are quickly becoming primary source of energy in coastal regions, islands, where they operate in autonomous mode. In this paper, a control strategy for controlled power extraction from...
The use of implantable medical devices is in remarkable growth. They have used to replace organ's function or to assist an organ to function properly. Implant's designs tend increasingly to the miniaturization (micro/ nanotechnology) in order to be more biocompatible and comfortable. Any time the implant needs energy to function properly. Have efficient, secure, biocompatible and healthy implant system...
The combination of many kinds of renewable energy sources, such as solar power, wind energy with the integration of batteries and diesel generators in the system, is widely used as an alternative energy source in remote areas. Solar and wind energies are widely available in the Southeast Region of Turkey. Therefore, a province situated in the southeastern of Turkey can be autonomous and provide its...
The integration of renewable energy to the network still limited due to their irregular production. This paper was interested to the study of renewable energy source, which is represented by a wind turbine connected to a permanent magnet synchronous generator (PMSG), and a storage system represented by the battery and the super capacitor. The purpose of this article is to study, model and control...
This paper presents a mathematical formulation for centralized energy management strategy (EMS) of microgrids in both grid connected and isolated modes. The microgrid energy management is formulated as an unit commitment problem with regard to the distribution network and the corresponding constraints leading to a mixed-integer non-linear programming (MINLP) formulation. In order to reduce the computational...
In a power system network, the system power needs are met by all the generating stations working in coordination. When there are many power generating units, a lot many operating strategies are possible to meet the time based varying power demand. In this paper, an optimization study is carried out to checkout the cost effectiveness of using a deloaded photovoltaic (PV) instead of battery. The three...
This paper proposes scheduling of induction generators on a DC microgrid system fed by multiple cage-rotor induction generators (CRIGs) to attain regulated voltage with minimal battery support. The capacity of each generator is selected such that next bigger generation unit is double that of previous i.e. the ratio 1∶2∶4∶8‥, which provides easy control of load-generation matching, duly supported by...
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