Showing papers on "Diesel generator published in 2004"

Hybrid Energy Systems

Abstract: biomass Any organic material that is used as a fuel. deferrable load An electrical load that must be supplied a certain amount of energy over a specified time period in an isolated electrical network, but that has some flexibility as to exactly when. diesel generator A device for producing electricity through the use of a diesel engine. dump load A device used to dissipate power in order to maintain stability in an isolated hybrid energy system. fuel cell A device for continuously producing electricity through a reaction between hydrogen and oxygen. hybrid energy system A combination of two or more energy conversion devices (e.g., electricity generators or storage devices), or two or more fuels for the same device, that, when integrated, overcome limitations that may be inherent in either. load (1) An energy consuming device; (2) the cumulative power requirement due to a number of devices connected to an electrical network. maximum power point tracker A DC-DC converter whose function is to maximize the power produced by a variable voltage DC generator, such as PV panels or a wind turbine, connected to a fixed voltage bus. optional load An electrical load which can be supplied by excess power in an isolated electrical network but need not be supplied if no excess power is available. penetration The instantaneous power from the renewable generator divided by the total electrical load being served in an isolated electrical network. photovoltaic panel (PV) A semiconductor-based device that converts sunlight to electricity. renewable energy source An energy source that is derived ultimately from the sun, moon, or earth’s internal heat. supervisory control A central control system whose function is to ensure proper operation of all the devices within a hybrid energy system. weak grid An electrical network whose operational characteristics can be affected by the presence of a generator or load connected to it. wind turbine A device that converts the power in the wind to electrical or mechanical power.

A three-phase utility power supply based on the matrix converter

Abstract: A matrix converter and variable-speed diesel generator are integrated to create a three-phase utility power supply. The matrix converter is designed to meet tight harmonic and transient response requirements while allowing variable voltage and frequency input from the generator's permanent magnet alternator; This enables the generator to provide stable power over a range of engine speeds and load conditions. Test results for the 10 kW offline power supply are provided to demonstrate system performance.

Apparatus and method for transient and uninterruptible power

Abstract: In accordance with certain exemplary embodiments, the present technique provides methods and apparatus for providing transient and uninterrupted power to protected loads. As one example, the present invention provides an induction device that operates as an induction motor to energize a kinetic energy storage device, such as a flywheel, during conventional operating conditions. However, in the event of a loss of primary power, the induction device, which is fed ac power at variable frequencies, begins to operate as an induction generator. For example, by varying the frequency of the input ac power such that the synchronous speed of the motor is exceeded by the rotating flywheel, the induction device acts as an induction generator and provides a transient operating power to the downstream loads until an auxiliary power source, such as a diesel generator, is brought on line.

Parallel operation of wind turbine, fuel cell, and diesel generation sources

Abstract: We investigated a small isolated hybrid power system that used a parallel combination of dispatchable and nondispatchable power generation sources. The nondispatchable generation came from a nature-dependent wind turbine, and the dispatchable generations were a fuel cell and a diesel generator. On the load side, the nondispatchable portion was the village load, and the dispatchable portion was the energy storage, which could be in many different forms (e.g., space/water heater, electrolysis, battery charger, etc.) The interaction among different generation sources and the loads was investigated. Simulation results showed the effect of the proposed system on voltage and frequency fluctuations.

Dynamic Simulation Model of a Hybrid Power System: Performance Analysis

Abstract: The different kinds of electrical power generators that might be used to feed power into a hybrid power system (HPS) can be connected to the load in several different ways. One important development is an electrical system in which the renewable sources feed a common DC-link while the load is fed by an inverter in parallel with a diesel generator. One advantage is that the system is very flexible. The diesel generator and the inverter can operate in stand-alone or parallel mode and an amount of the power feeds directly the load without losses. This paper presents an analysis of the behaviour of an HPS affected by the variability of the renewable resources and of the load using a dynamic simulation model. The model is based on two types of renewable power generation: wind turbine generator and photovoltaic generator, connected to an isolated grid constituted by a diesel generator. The interconnection of the renewable sources with the diesel generator is carried out by a DC-link and an inverter. The analysis focuses on the DC-link and AC bus. Two topologies of the system are investigated: with and without storage.

Techno-economic and environmental analysis for grid interactive solar photovoltaic power system of Lakshadweep islands

Abstract: The Lakshadweep group of islands in Arabian Sea is one of the two major groups of islands in India. In these islands the main source of electricity is diesel generators, the diesel being transported from the main land to produce over 9 MW of electricity. Considering the remoteness of the island and the polluting nature of the existing plants, it is desirable to adopt a strategy to utilize available potential of non-polluting renewable energy sources for these ecologically sensitive islands. A techno economic and environmental analysis for grid interactive solar photovoltaic power system of Union Territory of Lakshadweep islands is presented. This paper also examines the pollution aspect of power generation through Diesel Generator set and highlights the environmental benefits in using solar energy. Experiences of grid interactive solar photovoltaic power system installed recently in different islands are discussed and suggestions have been made for improving its efficiency and performance. Copyright © 2004 John Wiley & Sons, Ltd.

Investigation of diesel generator shaft and bearing failures

Abstract: A shaft failure in a 634 kW diesel generator after 4000 hours of operation required investigation, especially when similar sets began to show signs of excessive bearing housing wear. The failure was found to be due to torsional fatigue caused by operation at an unforeseen resonant condition. The damage to the bearing housing of this type of set was also attributed to this behaviour. Replacement of the bearings and housings and redesign of the flexible coupling has been undertaken to prevent further failures. Modifications to design procedures are now being adopted to ensure similar problems do not occur in other existing or new machines.

Diesel-liquid-electric serial type mixed power vehicle

Abstract: The utility model provides a diesel fluid electrical series hybrid power bus comprising a controller which is connected with an inverter. The lateral sides of the inverter are respectively connected with a battery group and a dynamo which is connected with a motor by a connecting component. The utility model utilizes the dynamo as the auxiliary power and uses the diesel motor to the machine and fluid drive, directly converses the energy of the motor into the machine energy driving the vehicle to run by the hydraulic transmission system which avoids using the diesel generator or the turbine engine generating set without being conversed into the power. Under the help of the auxiliary transmission system, the main transmission system spends most of the time on the best working point or area of the motor which can effectively improve the index of the let effect of the oil-saving. Under the situation that the city transportation often needs the frequent parking and the starting, the utility model also uses the energy to recollect the device which can save a large number of energy by recollecting the energy produced by the brake and trig.

Study the optimal operation of electric PV/B/D generation system by neural network

Abstract: This paper introduces an application of artificial neural network on the operation control of the photovoltaic/Battery/Diesel hybrid power generation system. It is generally agreed that using local information such as generated power from PV solar cells array and state of battery charge are calculated by new software under known insolation and load demand. The computer software which proposed here and applied to carry out these calculations is based on the minimization of the fuel consumption by diesel generator. Different feed forward neural network architectures are trained and tested with data containing a variety of operation patterns. The back propagation technique with sigmoid transfer function is used as the training algorithm. A simulation is carried out over one year using the hourly data of the load demand, insolation and temperature at Elminia site, Egypt. The results show that the selected neural network architecture gives reasonably accurate operation of the system.

Research on H_∞ Synthetic Controller for Diesel-generator Set of Ship Power Station

Abstract: The stability of a ship power system is mainly decided by the speed and voltage response charac- teristic of diesel-gnerator set in ship power station Because of the interaction between the speed and voltage, it is necessary to control them synthetically In this paper a diesel-generator set synthetic control system is designed by means of H∞ control theory, which transforms the requirements on specifications of system into a standard H∞ control problem The computer simulation result shows that the H∞ synthetic controller improves the dynamic precision of system and the ability of restraining the load disturbance in case of considering system model uncertainty The synthetic control problem of the speed and voltage can then be solved, and the stability of ship power system is improved

Performance and Life Cycle Cost Analysis of a Stand Alone PV Lighting System

Abstract: This paper studies the prospects of solar photovoltaic (PV) application in the remote rural areas of Bangladesh. Performance and life cycle cost analysis of a stand alone PV system in Bangladesh is done. The experimental setup is developed in a laboratory of Bangladesh University of Engineering and Technology (BUET). This system is designed and installed to supply electricity to 14 fluorescent lamps. This system consists of 180 W peak capacity PV modules, charge control unit, batteries, switching circuits, and connecting wires. The life cycle cost (LCC) of this PV lighting system has been compared with that of an isolated diesel generator. The analysis shows that life cycle cost of the PV system is lower than the diesel generator.

Remote-area Power-supply (RAPS) Systems and the Valve-regulated Lead-Acid Battery

Abstract: Publisher Summary This chapter focuses on the remote-area power-supply (RAPS) systems and the use of valve-regulated lead–acid (VRLA) batteries in them. RAPS systems are expected to operate reliably in a variety of inhospitable environments. They can be confronted with the searing heat of the desert, the stifling humidity of the rainforests, or the intense cold of the tundra. The facilities may even be sited on oceans or atop mountains. RAPS systems capable of supplying continuous power must have either a diesel generator in constant operation and/or a battery bank. If renewable energy is abundant, RAPS systems can also include a photovoltaic (PV) array, a wind generator, and/or a hydro-generator. The use of VRLA batteries in RAPS systems is very attractive where space is limited and/or real estate is expensive. The batteries can generally be operated on their sides and can be stacked together closely in racks as access is not required for water maintenance. This can result in a 50% decrease in both the footprint and the volume taken up by the battery bank. The reduced tendency of VRLA batteries to exhibit stratification can increase the life of the RAPS system components and also improves the efficiency of the system, especially when a diesel generator is included.

Diesel power generator set chassis integrated with fuel tank

Abstract: The utility model discloses a diesel generator set chassis integrated with an oil tank. The ordinary small and medium-sized diesel generator set chassis is separated with the oil tank, which makes the generator set have the large floor area and a plurality of consumable materials; but the diesel generator set chassis provided in the utility model and the oil tank are welded into a whole. The ordinary small and medium-sized diesel generator set chassis is welded with a channel steel, which has the defects of a plurality of consumable materials, the easy rustiness, the difficult painting and the incontrollable processing deformation; but the diesel generator set chassis provided in the utility model is welded by bending the steel plate. The utility model is applied to the small and medium-sized diesel generator set field, which can make the generator set chassis and the oil tank have the simple manufacture and the low cost, and simultaneously can make the generator set have the compact structure and the beautiful appearance and improve the market competitiveness of the diesel generator set products.

Parallel Operation of Wind Turbine, Fuel Cell, and Diesel Generation Sources: Preprint

Abstract: We investigated a small isolated hybrid power system that used a parallel combination of dispatchable and non-dispatchable power generation sources. The non-dispatchable generation came from a nature-dependent wind turbine, and the dispatchable generations were a fuel cell and a diesel generator. On the load side, the non-dispatchable portion was the village load, and the dispatchable portion was the energy storage, which could be in many different forms (e.g., space/water heater, electrolysis, battery charger, etc.) The interaction among different generation sources and the loads was investigated. Simulation results showed the effect of the proposed system on voltage and frequency fluctuations.

Cooling water circulating device of engine

Abstract: PROBLEM TO BE SOLVED: To prevent a structure from being complicated and a cost from being raised by enabling a stopped engine to be warmed up with a simple constitution. SOLUTION: A shaft generator (first generator) 14 is coupled to be driven by a main diesel engine 11, and a cooling unit 21 is provided. Generators 17, 18 are respectively coupled to be driven by diesel generator engines 15, 16, and a cooling unit 61 is provided. The cooling units 21, 61 are coupled via a cooling passage 91 having a solenoid valve 93. A controller 19 can control to open or close the solenoid valve 93 of a cooling water passage 91 in response to the operating states of the main diesel engine 11 and the diesel generator engines 15, 16. COPYRIGHT: (C)2004,JPO&NCIPI

Design and Determination of the Most Cost Effective PV Configuration Systems to Meet the Loads of a Household

Abstract: A methodology to determine the most cost effective solution for an integrated hybrid PV system to meet the loads of a household is presented. The PV hybrid system consists of a photovoltaic generator backed up by a Diesel generator or by wind power. Such systems show greater reliability to meet the loads and it, often, represent the most effective solution, whenever wind potential is not adequately available. The primary objectives are: a) to size a PV hybrid system which meets the load demand of a household, b) to present a methodology to determine the most cost effective solution amongst the possible configurations and the various types of system’s components.

Studies of Energy Management by Control Models for a Photovoltaic System in a Rural Area of Thailand

Abstract: This paper presents control strategies for a hybrid energy system for a rural village in Thailand. The hybrid system designed for Ban Kohjig consists of PV, wind and diesel generator, all of which will provide 109,163 kWh/year for the island. Fuzzy control technique is studied as a tool to manage energy for the hybrid system to be installed at Ban Kohjig. The objective is to run the fueledengine generator for a short period of time to achieve the optimum point of the system. The data was collected during June 2002. The simulation results indicate that the fuzzy control technique can perform with a hybrid energy system in the area studied.

The determination of optimum parameters of the main diesel generator system on degaussing ship

Abstract: The load of the main diesel generating system on a degaussing ship is impulsive, which rise to the maximum value and drop to the minimum value in very short time, and its ranges are degressive. In this paper, based on the analysis of the load characteristics, and take the adaptability and economics into account, the factors like the rated power of diesel engine, the flywheel inertia, the governor's dynamic performance and the working speed which will affect the system's dynamic performance and cost are analyzed. An optimizing model which takes advantage of multiple-objective optimizing theory for the design of this kind of system is achieved. And based on this model, a design instance is committed by the using simulation method. At last, some conclusions which are worth consideration during realistic design are presented.

Renewable energies in the decentralized energy supply

Abstract: An energy supply system is proposed based on a combination of renewable energy plants using solar, wind and biomass, supplemented by a traditional diesel generator and supervised by a management unit. This decentralized energy supply system, with high local production contents, is well adapted for regions where it is costly and/or practically difficult to supply by the conventional centralized way by means of a nation-wide grid. In a developing country, the decentralized supply can be a rural village size system that can assure high availability and supply security for the local population. The aim is to decrease as much as possible the operating time of the diesel aggregate in order- to reduce the diesel fuel costs and wear and tear due to a high number of (continuous) operating hours. A typical village electrical power requirements as well as its renewable energies potential are described. The improved design of the advanced supply system with circuit schematics and power dimensioning are presented in this paper.

A Multi-Phase Offline Power Supply for Battlefield Power

Abstract: : A matrix converter and variable-speed diesel generator are integrated to create a three-phase utility power supply. The matrix converter is designed to meet tight harmonic and transient response requirements while allowing variable voltage and frequency input from the generator's permanent magnet alternator. This enables the generator to provide stable power over a range of engine speeds and load conditions. Test results for the 10 kW offline power supply are provided to demonstrate system performance.

Lightning Protection for a Complex Isolated Renewable and Diesel Power Network - Micro Grid

Abstract: In this paper a specific Lightning Protection System (LPS) design for an isolated complex renewable and diesel power network - micro grid will be described. This isolated power network was established in 1992 on the Holy Mount - Agion Oros - for the Simonopetra monastery in northern Hellas. It is composed of a 33kW Hydro generator, a 45kW Solar system, and 60kVA Diesel generator. Due to the wide space area of the installation a specific external LPS needed to be designed. Additionally due to the sensitive electronics of the control and protection systems of the network, surge protection (Surge Protection Devices - SPDs), equipotential bonding and shielding were also of major importance. The high altitude in addition to the high ground flash density made this system vulnerable to lightning flashes. Ten years now the isolated power network it is protected against lightning. The paper apart from the LPS design, which was used it also aims to evaluate the performance of the LPS that is now in use over this ten years period.

A three-phase utility power supply based on the matrix converter

Abstract: A matrix converter and variable-speed diesel generator are integrated to create a three-phase utility power supply. The matrix converter is designed to meet tight harmonic and transient response requirements while allowing variable voltage and frequency input from the generator's permanent magnet alternator. This enables the generator to provide stable power over a range of engine speeds and load conditions. Test results for the 10 kW offline power supply are provided to demonstrate system performance.