Showing papers on "Diesel generator published in 2005"

A hybrid power system using alternative energy facilities in isolated island

Abstract: A hybrid power system uses many wind turbine generators in isolated small islands. The output power of wind turbine generators is mostly fluctuating and has an effect on system frequency. In order to solve this problem, we propose a new power system using renewable energy in small, isolated islands. The system can supply high-quality power using an aqua electrolyzer, fuel cell, renewable energy, and diesel generator. The generated hydrogen by an aqua electrolyzer is used as fuel for a fuel cell. The simulation results are given to demonstrate the availability of the proposed system in this paper.

The organic composition of diesel particulate matter, diesel fuel and engine oil of a non-road diesel generator

Abstract: Diesel-powered equipment is known to emit significant quantities of fine particulate matter to the atmosphere. Numerous organic compounds can be adsorbed onto the surfaces of these inhalable particles, among which polycyclic aromatic hydrocarbons (PAHs) are considered potential occupational carcinogens. Guidelines have been established by various agencies regarding diesel emissions and various control technologies are under development. The purpose of this study is to identify, quantify and compare the organic compounds in diesel particulate matter (DPM) with the diesel fuel and engine oil used in a non-road diesel generator. Approximately 90 organic compounds were quantified (with molecular weight ranging from 120 to 350), which include alkanes, PAHs, alkylated PAHs, alkylbenzenes and alkanoic acids. The low sulfur diesel fuel contains 61% alkanes and 7.1% of PAHs. The identifiable portion of the engine oil contains mainly the alkanoic and benzoic acids. The composition of DPM suggests that they may be originated from unburned diesel fuel, engine oil evaporation and combustion generated products. Compared with diesel fuel, DPM contains fewer fractions of alkanes and more PAH compounds, with the shift toward higher molecular weight ones. The enrichment of compounds with higher molecular weight in DPM may be combustion related (pyrogenic).

Optimal sizing of hybrid power system using genetic algorithm

Abstract: This paper presents an optimized design of stand-alone multi sources hybrid power system includes sources like, wind farm, photovoltaic array, diesel generator and battery bank based on an evolutionary algorithm. In this work, the battery bank has been used to cover the emergency loads energy. For this approach, economic aspects such as interest rate, inflation, capital recovery factor, sinking found factor have been expressed for each power sources, and then an objective function with aim to minimizing of all system costs, has been clarified. A genetic algorithm approach is employed to obtain the best cost value of hybrid power system construction. Simulation results show this method calculates the electrification costs (capital cost, replacement costs, operation and maintenance cost and fuel cost) over a period of 20 years for two different cases

A utility power supply based on a four-output leg matrix converter

Abstract: A four-output leg matrix converter and a variable-speed diesel generator are integrated to create a three-phase plus neutral utility power supply. The matrix converter is designed to meet tight harmonic specification and the fourth leg provides the facility to supply unbalanced and single-phase loads. This enables the generator to provide stable power over a range of engine speeds and load conditions. Two modulation techniques for four-output leg matrix converters have been considered and compared. Test results for a 10-kW offline power supply are provided to demonstrate system performance.

The effect of diesel fuel sulfur content on particulate matter emissions for a nonroad diesel generator.

Abstract: The effect of sulfur content on diesel particulate matter (DPM) emissions was studied using a diesel generator (Generac Model SD080, rated at 80 kW) as the emission source to simulate nonroad diesel emissions. A load simulator was used to apply loads to the generator at 0, 25, 50, and 75 kW, respectively. Three diesel fuels containing 500, 2100, and 3700 ppm sulfur by weight were selected as generator fuels. The U.S. Environmental Protection Agency sampling Method 5 "Determination of Particulate Matter Emissions from Stationary Sources" together with Method 1A "Sample and Velocity Traverses for Stationary Sources with Small Stacks or Ducts" was adopted as a reference method for measurement of the exhaust gas flow rate and DPM mass concentration. The effects of various parameters on DPM concentration have been studied, such as fuel sulfur contents, engine loads, and fuel usage rates. The increase of average DPM concentrations from 3.9 mg/Nm3 (n cubic meter) at 0 kW to 36.8 mg/Nm3 at 75 kW is strongly correlated with the increase of applied loads and sulfur content in the diesel fuel, whereas the fuel consumption rates are only a function of applied loads. An empirical correlation for estimating DPM concentration is obtained when fuel sulfur content and engine loads are known for these types of generators: Y = Zm(alphaX + beta), where Y is the DPM concentration, mg/m3, Z is the fuel sulfur content, ppm(w) (limited to 500-3700 ppm(w)), X is the applied load, kW, m is the constant, 0.407, alpha and beta are the numerical coefficients, 0.0118 +/- 0.0028 (95% confidence interval) and 0.4535 +/- 0.1288 (95% confidence interval), respectively.

Fuzzy logic modeling of unmanned surface vehicle (USV) hybrid power system

Abstract: Unmanned surface vehicles (USVs) can serve the roles of providing Intelligence, Surveillance and Reconnaissance (ISR) to a fleet as well as performing mine countermeasure (MCM) missions. Many of these missions require some period of low observable/stealth mode operation of the USV. The focus of this paper is modeling of a hybrid power system to meet for a USV to meet the mission profiles. The power system of the USV is chosen to be a hybrid power source comprising a diesel generator and a lithium-ion battery pack. Optimal sizing of the diesel generator and battery pack is important for ensuring successful USV missions. This paper describes the characterization and modeling of 70 Ah Kokam cells using fuzzy logic analysis of the experimental data to accurately estimate the SOC, power available and the terminal voltage of this Li-Ion battery. We also describe fuzzy logic-based modeling of a diesel generator. The power required to propel the USV was estimated from a planning hull drag model. This model developed in the MATLAB/Simulink environment is also described in this paper

Wind light and diesel complementary system control conversion integrated machine

Abstract: The utility model provides a wind-light-diesel oil complementary system control conversion integrated machine which can combine solar energy and a wind-driven generator with the complementary system of a diesel generator set to control a storage battery to charge and discharge and to invert to alternating current. The wind-light-diesel oil complementary system control conversion integrated machine is integrated with the processes of solar energy maximum power tracking, windmill overvoltage protection, storage battery charging and discharging control, inversion / rectification, filtering / pressure boost and duplicate supply switching; a center processing unit controls a main board to uniformly manage, detect, regulate and control the operation of the whole machine, and the machine is communicated with external world via a man-machine interface. The utility model can increase the operating efficiency of the whole system, greatly lower the power failure time of a load, thoroughly utilize green cleaning energy sources such as solar energy, wind energy, etc., guarantee the operating life of the storage battery, and lower the operating and maintaining working amount of operators.

RBF NN based marine diesel engine generator modeling

Abstract: For building a real time marine power system simulator, models of fast calculation and high precision of marine power system are needed. Because there are abilities of learning and batch operation with artificial neural networks (ANN), it is fit for using ANN to build a real time marine diesel generator model for marine power system simulator. In this paper, radial basis function neural networks (RBF NN) was used for building model of marine diesel engine generator. RBF NN is a universal approximation neural network. There is an ability to approximate a nonlinear function with RBF NN. According to the working principles of diesel generator, parameters of excitation current/voltage and diesel engine mechanical torque are inputs of RBF NN, while parameters of terminal voltage current and frequency of generator are outputs for RBF NN training. The type of supervised learning of center selection strategy was used for the RBF NN learning method. An approximated model of marine diesel generator is built in high precision result with 99 hidden neurons of RBF NN.

Small size digital noise-reduced diesel generator

Abstract: The utility model relates to a small size digital noise-reduced diesel generator, which is used for the current supply of the field automotive power supply and a spare power supply. And the utility model belongs to the technical field of the electromechanical device. The utility model chiefly adopt that a permanent-magnet machine is fastened on a diesel engine. The utility model is characterized in that: a dissipative muffler casing is arranged on the dissipative muffler; an empty filter is installed on a wind scooper; the positions of the cylinder end of the diesel engine and the oil pan can be encompassed by an upper air deflector, a side air deflector, and a lower air deflector; an upper and lower cooling ventilating cavities are respectively formed; a storage battery and an invert module are parallelly fastened in front of the wind scooper; a cabinet is fastened on a chassis, then the cabinet is fastened with the front casing and the back casing. The utility model which adopts the present mature invert technique has stable output voltage; through the output instruction of the invert module, the opening degree of the throttle can be controlled by a stepping motor, and thus the operating goal with energy conservation can be obtained. The utility model has small size, light weight, and high generating efficiency; the noise of the units can be reduced; plastic parts and formed parts are adopted in large quantities, and the small size digital noise-reduced diesel generator is made to have simple assemblage and maintenance, small volume of the complete machine, and light weight.

A hybrid topology for a variable speed wind-diesel generation system using wound rotor induction machines

Abstract: In this paper a energy system topology consisting of a diesel and wind turbine generation units is presented. Wound rotor induction machines are considered to provide energy to an isolated load at constant voltage and frequency. Both generator rotor currents are vector controlled and operate at variable speed. The scheme uses a common DC bus for the voltage source PWM rotor side inverter of each machine. Another vector controlled voltage source PWM inverter is connected between the DC bus and the stator to allow sub and super synchronous speed operation of both generators. The diesel generator unit balances the system power and changes the speed according to power demand in order to minimise the fuel consumption. The variable speed operation of the wind energy conversion system maximises the energy capture by controlling the generator electric torque. An experimental prototype has been set with the diesel engine and the wind turbine emulated with a AC and DC drive respectively. The system has been tested to load impacts and step changes in wind velocity and experimental results for optimum speed tracking are shown.

Technical and Economic Analysis of a PV/Diesel Hybrid System Applied to Rural Electrification for Isolated Communities in the Northern Brazilian Region

Abstract: A technical and economic feasibility analysis on a hybrid photovoltaic-diesel system is presented for a typical village located in the northern Brazilian rain forest region. A 24 kW photovoltaic system is proposed to be installed on a hybrid configuration with a 150 kVA existing diesel generator. Based on electricity demand profiles and current costs, the analysis shows a payback time which is still too long and not economically attractive without government subsidies. However, with the declining costs of photovoltaic technology predicted for the next few years and the continuously increasing costs of diesel, the hybrid photovoltaic-diesel systems may become economically viable, thus representing a huge potential in the near future. Real electricity demand profiles are also presented for several typical isolated communities located in that region

Wind Resource Assessment Of Eastern Coastal Region Of Saudi Arabia

Abstract: In the present study, the hourly mean wind-speed data of the period 1986-1997 recorded at the solar radiation and meteorological station, Dhahran (Eastern coastal plain of Saudi Arabia), has been analyzed to present different characteristics of wind speed in considerable depth such as: yearly, monthly, diurnal variations of wind speed, etc. The long-term monthly average wind speeds for Dhahran range from 4.2 to 6.4 m/s. More importantly, the study deals with impact of hub height on wind energy generation. Attention has also been focussed on monthly average daily energy generation from different sizes of commercially available wind machines (150 kW, 250 kW, 600 kW) to identify the optimum wind machine size from energy production point of view. It has been found that for a given 6 MW wind farm size, at 50 m hub height, array of 150 kW wind machines yields about 48 % more energy as compared to 600 kW wind machines. Literature shows that commercial/residential buildings in Saudi Arabia consume an estimated 10 - 40% of the total electric energy generated. So, concurrently, as a case-study, attempt has been made to investigate/examine the potential of utilizing hybrid (wind-diesel) power systems to meet the load requirements of hundred typical 2-bedroom residential buildings (with annual electrical energy demand of 3512 MWh). The hybrid systems considered in the present case-study consist of different combinations of wind machines (of various capacities), supplemented with battery storage and diesel back-up. The deficit energy generated from the back-up diesel generator and the number of operational hours of the diesel system to meet a specific annual electrical energy demand of 3512 MWh have also been presented. The evaluation of hybrid system shows that with seven 150 kW WECS (wind energy conversion systems) and three days of battery storage, the diesel back-up system has to provide 17.5 % of the load demand. However, in absence of battery storage, about 37 % of the load needs to be provided by the diesel system

Small-scale test bench of a hybrid power system

Abstract: The study of behaviour of the hybrid power systems (HPS) for remote areas is one of research axes of our laboratory. Simulink blocks with models corresponding to all the system parts have been developed. Control laws have been implemented to ensure the optimal power retrieval, the system stability and the output power quality. In order to make possible the models and the control laws validation, a small scale HPS (1:100 of power) is under construction. It is composed of renewable sources (a wind turbine generator and photovoltaic panels), buffer batteries, DC/DC and DC/AC converters, diesel generator and load/faults emulator. For the system development some stages is necessary. Beginning with a simple starting structure, in every step a part is added or changed and the system operation is verified

Diesel-generator-units dynamic analysis during the start-up of induction motors drives

Abstract: The paper analyses the dynamics of generator-units during start-up of the induction motor drives. A unique mathematical model of integral motor drives has been developed, consisting of: a diesel engine, a synchronous generator and two non-regulated motor drives fed directly from generator-unit terminals. The aim of this paper is to compare dynamics behaviours of the generator-units during starting the second induction motor at the moment when the instantaneous electromagnetic torque of the synchronous generator reached various values

Larege power intelligence optical-net-firewood mutual compensating power station

Abstract: The utility model relates to a large power intelligence light-network-diesel oil mutual compensating power station which is mutually combined and compensated by solar power generation, electric network generation and diesel engine generation. The main structure of the large power intelligence light-network-diesel oil mutual compensating power station is that a solar power generation device, a diesel generator set and a through electric network are connected with a quick switcher; a controller is connected with the quick switcher to control the solar power generation device, the diesel generator set and the through electric network to supply electricity for a load; the controller is provided with a remote communication interface; the quick switcher is composed of three groups of three-phase four-wire system relays k 1, k 2, k 3; the first power supply (A) of the first group supplied by the solar power is inputted with alternating current voltage in an inversion three-way mode, and the alternating current voltage is conveyed to the load through the controller and the relay K1; the second power supply (b) of the second group supplied by the electric network is inputted with the alternating current voltage in an electric network three-way mode, and the alternating current voltage is conveyed to the load through a voltage stabilizer, the controller and the relay k 2; the third power supply (c) of the third group supplied by the diesel engine generator is inputted with the alternating current voltage in a diesel oil generation mode, and the alternating current voltage is conveyed to the load through the voltage stabilizer, the controller and the relay k 3. The utility model has simple structure, reliable switching performance, stable power supply and low cost.

Output protection strategies for battlefield power supplied by matrix converters

Abstract: The US Army Research Laboratory is currently studying the application of matrix converters to supply battlefield loads using variable speed diesel generators by utilizing a matrix converter to provide a bidirectional, three-phase to three-phase, direct AC to AC link between a diesel generator and load. This allows more efficient and economical operation of the diesel generators. A very brief overview of the matrix converter and standard protection strategies is presented, followed by new output protection strategies. The new output protection strategies account for the presence of the third harmonic component in the matrix converter output. Simulations are then presented to prove that the added output protection is capable of protecting a matrix converter and load when used in battlefield applications while adding increased selectivity and diagnostic capabilities.

Four kind power supply and oil-water preheating device for diesel locomotive

Abstract: The utility model discloses a four kind power supply and oil-water preheating device for diesel locomotive, comprising a circulation water pump (9), an intake pipe (15), a flow adjusting valve (8), an exhaust-gas heat exchanger (4), a heater (7), a thermostatic control valve (5) and an auxiliary diesel generator set composed of a diesel (1) and a generator (2), and a stabilizing communicating module (13). The input terminal of the stabilizing communicating module (13) is connected to the generator (2), the output terminal is connected to a storage battery set (11) on the diesel locomotive, and the generator (2) is connected to an air conditioning (12) on the diesel locomotive through lead wires; the auxiliary diesel generator set is connected to the oil-water system of the diesel (10) of the diesel locomotive through a reflux pipe (14) and then is connected to the exhaust-gas heat exchanger (4) directly through a cooling water pipe (6), and the thermostatic control valve (5) is arranged on the cooling water pipe (6). The utility model is started conveniently with good dependability, fast heating rate, low cost, simple operation, and convenient maintenance, extends the service life of the diesel, and without turning hard and adding temperature to the diesel eliminates the phenomena that the oil gets thick, the running pieces are abraded and the environment is polluted, which are caused by spouting oil at a slow speed and the imperfect atomization.

A design criterion for the vibration isolation of a marine diesel generator set

Abstract: The resilient mounts of a diesel engine installed onboard a ship should be designed for both static and dynamic loads. If possible, the resonance frequencies of the six rigid body modes of the installation and the flexible modes of the engine support structure should not lie within the engine operation range. In this paper a design criterion is proposed to evaluate an isolation system which involves the summation of dynamic forces transmitted through the resilient mounts and elastic potential energy index stored in the mounts. A case study is also presented in which a diesel engine generator, which had an elastic foundation and was mounted in a 5500 TEU container vessel, was studied both theoretically and experimentally. The theoretical analysis of the test model was performed by using a single mass 6 degree of freedom system. Actual measurements of mechanical vibration of the engine and its foundation onboard were carried out, which showed the importance of including the flexibility of the engine support structure in the model.

Cooler of diesel generator set

Abstract: The utility model provides a cooler of a diesel generator set, belongs to the generator set field, and is suitable for diesel generator sets A fixing shaft is provided with a bearing and a rotatable bearing housing, and a bearing gland and a belt pulley are fixed by screws on the bearing housing to form an integral body The outer side of the bearing housing is provided with a fan housing whose end is provided with a cooling chamber housing whose upper portion is provided with an upper water tank, and the lower portion of the cooling chamber housing is provided with a lower water tank The upper water tank and the lower water tank are connected by a plurality of heat radiating pipes The cooler of a diesel generator set of the utility model has the advantages that the cooler of a diesel generator set occupies small ground, the cooler of a diesel generator set can be moved following the movement of the diesel generator sets, and water pools do not need to be built

Method of operation of self-contained power station

Abstract: FIELD: engine manufacturing. ^ SUBSTANCE: invention relates to method of operation of self-contained power station powered by diesel-generator set. According to proposed method of operation of self-contained power station powered by diesel generator set equipped with additional flywheel and disconnect clutch with automatic control members, additional flywheel is mounted on separate shaft which is connected with diesel-generator set by means of disconnect clutch. Preparatory operation is carried out to set power station into operation with subsequent overcoming of short-time starting resistances from consumer. Additional flywheel is connected to shut down diesel generator set by means of disconnect clutch. Power station is started under no load, and its coming to rated speed is detected by readings of generator shaft speed pickups. Load is connected and intensity of generator shaft speed drop is checked. Information is automatically transmitted to controller wherefrom, at termination of generator speed drop, signal is transmitted to disconnect clutch, and rotating additional flywheel is disconnected from diesel generator set, thus changing the set for accelerated mode of restoration of initial rated speed. ^ EFFECT: provision of power saving operation at stable conditions for overcoming designed resistance torque and short-time overloads exceeding capabilities of chosen supply source. ^ 1 dwg

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.

Diesel generator set

Abstract: The utility model relates to a diesel generator set which comprises a diesel motor, an electric generator, a control screen, a base and a connecting part The diesel motor and the electric generator are coaxially connected by the connecting part and are installed on the base The diesel generator set is characterized in that the control screen is installed on the base near the electric generator at one side of the connecting part The utility model overcomes the shortages of the prior art, solves the vibration problem of the control screen for causing instruments to be safer, causes the management and the operation of the control screen to be more convenient and reduces workers' labor intensity

The use of palm oil in diesel engine

Abstract: A research about the use of palm oil in Diesel generators was carried on and is presented in this paper. The objective was to determinate the engine modifications required to improve its performance, emissions and durability when using palm oil as fuel. In previous research carried on, lubricant oil dilution and deterioration was presented after 100 hours of operation. With palm oil (heated to 80 o C), partial combustion and carbon deposits in the injectors was also present after 300 hours of operation. Then several operations variables where investigated as well as modifications on engines installations. A double filtering device was installed before the fuel pump admission. Also a Kit was installed in the diesel engine constituted by a heater using the diesel engine cooling water to re-heat the palm oil to 96 o C. Those modifications results in ignition delay improvements and better combustion in ASTM CFR Engine, installed in the Thermal Engines Laboratory (LMT). This engine was used in order to investigate the variation of operation parameters using palm oil as fuel and the results were compared to those obtained with diesel oil operation. The results using turbo generation (higher maximum indicated pressure in the operation) as well as a ignition delay modification, improved performance and emissions in the Diesel generator installed in a isolated village, a improvement in lub oil performance and a lower carbon deposit were also achieved.

Electric drive full-automatic control combine

Abstract: A full-automatic control combine is composed of a the ordinary combine without belt drive, hydraulic control and clutch manipulation, diesel generator, speed variator, servo unit, electric motor, reciprocating electromagnetic driver, computer, and automatic controller.

Test of a 1500 W Fuel Cell at Practical Condition as a Source of Back-up Power in an UPS-System

Abstract: Most of UPS-systems use batteries as back-up energy source. Usually here we find lead-acid batteries or NiCd batteries when its a high ambient temperature. If longer back-up times are required an additional diesel generator will provide the energy. This paper presents the results of some tests, where a fuel cell system generates the back-up energy on a 48 V level