scholarly journals PARALLEL OPERATION OF DIESEL GENERATOR SETS OF CONSTANT AND VARIABLE SPEED

2018 ◽  
pp. 93-99
Author(s):  
Dmitry Sergeevich Kobyakov ◽  
Evgeniy Mordcovich Burda ◽  
Andrey Borisovich Daryenkov ◽  
Ilya Aleksandrovich Tarpanov ◽  
Oleg Stanislavovich Khvatov
Keyword(s):  
Electric Propulsion ◽  
Energy Performance ◽  
Variable Load ◽  
Variable Speed ◽  
Diesel Generator ◽  
Power Station ◽  
Functional Scheme ◽  
Diesel Generators ◽  
Speed Mode ◽  
Single Power

The paper focuses on the operation of the ship's single power station with a common link of direct current and a diesel generator of variable speed are considered. It is shown that the operation of a diesel generator set at a constant (nominal) rotational speed, but variable load is characterized by a nonoptimal (overrated) specific fuel consumption. At the same time, forced regulation of the internal combustion engine rotation speed in accordance with the electric load of the generator make it possible to provide energy-efficient mode of generating electricity. One way to improve the energy performance of the ship single power station is to convert one of the parallel operating diesel generators into a variable speed mode. In this case, the load between the parallel operating diesel generators is distributed in proportion to their rotation frequencies, regardless of the individual loading of the propulsion motors. To stabilize voltage of the diesel generators operating in the variable speed mode, a power semiconductor converter is used. Functional scheme and mathematical simulation model of the ship single power station, graphs of transient processes with load changes in the channel of electric propulsion system of the vessel are presented.

scholarly journals Improving energy performance power station of ship with integrated electric propulsion

2017 ◽  
Vol 108 ◽  
pp. 14002 ◽  
Author(s):  
Andrey Dar’enkov ◽  
Ivan Samoyavchev ◽  
Oleg Khvatov ◽  
Valeriy Sugakov
Keyword(s):  
Electric Propulsion ◽  
Energy Performance ◽  
Power Station

scholarly journals Variable Speed Diesel Generators: Performance and Characteristic Comparison

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 592
Author(s):  
Mohammadjavad Mobarra ◽  
Miloud Rezkallah ◽  
Adrian Ilinca
Keyword(s):  
Diesel Engine ◽  
Performance Appraisal ◽  
Energy Demand ◽  
Ghg Emissions ◽  
Variable Speed ◽  
Diesel Generator ◽  
Remote Areas ◽  
Low Load ◽  
Diesel Generators ◽  
Electric Loads

Diesel generators (DGs) are set to work as a backup during power outages or support the load in remote areas not connected to the national grid. These DGs are working at a constant speed to produce reliable AC power, while electrical energy demand fluctuates according to instantaneous needs. High electric loads occur only for a few hours a day in remote areas, resulting in oversizing DGs. During a low load operation, DGs face poor fuel efficiency and condensation of fuel residues on the walls of engine cylinders that increase friction and premature wear. One solution to increase combustion efficiency at low electric loads is to reduce diesel engine (DE) speed to its ideal regime according to the mechanical torque required by the electrical generator. Therefore, Variable Speed Diesel Generators (VSDGs) allow the operation of the diesel engine at an optimal speed according to the electrical load but require additional electrical equipment and control to maintain the power output to electrical standards. Variable speed technology has shown a significant reduction of up to 40% fuel consumption, resulting in low GHG emissions and operating costs compared to a conventional diesel generator. This technology also eliminates engine idle time during a low load regime to have a longer engine lifetime. The main objective of this survey paper is to present the state of the art of the VSDG technologies and compare their performance in terms of fuel savings, increased engine lifetime, and reduced greenhouse gases (GHG) emissions. Various concepts and the latest VSDG technologies have been evaluated in this paper based on their performance appraisal and degree of innovation.

Energy Savings for Silent Camp™ Hybrid Technologies

2006 ◽  
Vol 4 (2) ◽  
pp. 134-137
Author(s):  
Franklin H. Holcomb ◽  
Joseph Bush ◽  
James L. Knight ◽  
Jason Whipple
Keyword(s):  
Power Generation ◽  
Fuel Cells ◽  
Fuel Cell ◽  
Storage System ◽  
Low Noise ◽  
Base Case ◽  
Variable Load ◽  
Diesel Generator ◽  
Peak Efficiency ◽  
Diesel Generators

In military base camp operations, the standard method of power generation is via the use of diesel generators. Unfortunately, these generators are often noisy and inefficient. Base camps could benefit from a “silent camp™” operation, in which power is supplied via low-noise, low-impact methods such as fuel cells. Base camps have a variable load profile (they use more power during peak hours than at other times), and low loading levels (their generators’ rated capacity is normally much greater than the load). Consequently, the generators only operate at peak efficiency for short, intermittent intervals. Under these conditions, the generators’ fuel use is less than optimal, they require frequent maintenance, and their life cycle is shortened. Approximately 60–70% of maintenance problems for diesel generators are directly attributable to “wetstacking,” which occurs when these generators are operated at less than 50% of their rated capacity (Commerce Business Daily, Feb. 16, 2000). One solution to address these issues is to institute a hybrid power system, consisting of: a fuel cell (with inverter), an electrolyzer, and a metal hydride storage system, all coupled and packaged with a diesel generator. This system would enable the generator to operate at peak efficiency while increasing the capabilities of the power generation system. Such a system could offer numerous benefits over the base case stand alone generator as follows: (1) the ability for Silent Camp™ operation (by using the fuel cell output exclusively); (2) potential for reduced fuel consumption; (3) reduced instances of “wetstacking,” thereby decreasing generator maintenance costs; (4) the ability to have backup power from fuel cells; (5) refueling capability for hydrogen devices or vehicles; and (6) reduced environmental impact in terms of pollutant, acoustic, and thermal emissions.

scholarly journals APPLICATION IN AUTONOMOUS POWER PLANTS OF A DIESEL GENERATOR SET WITH A VARIABLE FREQUENCY OF ROTATION

2018 ◽  
pp. 42-48
Author(s):  
Grigory Ivanovich Korobko ◽  
Ivan Grigorievich Korobko ◽  
Maksim Petrovich Shilov
Keyword(s):  
Power Plant ◽  
Fuel Consumption ◽  
Power Plants ◽  
Constant Speed ◽  
Total Power ◽  
Variable Frequency ◽  
Logic Device ◽  
Diesel Generator ◽  
Functional Scheme ◽  
Diesel Generators

In modern electric engineering development and implementing autonomous diesel generator sets is considered as a new technological trend. The article focuses on the functional scheme of a diesel generator power station with variable frequency of rotation and control systems, the application of which will allow reducing fuel consumption. The main control units of the proposed variant of the autonomous power plant are a logic device and a synchronizer. After switching the diesel generator on the parallel operation, basic functions of the logic device are to estimate loading and issuing a task for diesel generators. On the basis of the obtained data, the tasks of controlling the state of the generator automaton for the diesel generator, which is in priority over the start/stop, are performed. To evaluate the efficiency criteria, a graph of load power variation is given depending on the power of diesel generators, in which the optimal load intervals are determined. Such a distribution allows achieving reduction in fuel consumption and cost of electricity, providing an increase in the economic performance of an autonomous power plant. Despite the fact that the autonomous power plant has limited power, the proposed variant provides a load reserve in the range 15-110% and overload capacity in the range 13-43% of the total power of the diesel generator with constant speed. A graph of fuel consumption change depending on the active power consumed is presented. The basic interval of work with the minimum consumption of fuel is defined. For comparison, curves are shown that reflect the efficiency of using a diesel generator with variable speed as compared to a unit operating at a constant speed.

scholarly journals Fuel Consumption and CO2 Emission Reductions of Ships Powered by a Fuel-Cell-Based Hybrid Power Source

2019 ◽  
Vol 7 (7) ◽  
pp. 230 ◽  
Author(s):  
Gilltae Roh ◽  
Hansung Kim ◽  
Hyeonmin Jeon ◽  
Kyoungkuk Yoon
Keyword(s):  
Fuel Cell ◽  
Co2 Emission ◽  
Electric Propulsion ◽  
Power Source ◽  
Test Bed ◽  
Diesel Generator ◽  
Power Sources ◽  
Electric Propulsion System ◽  
Hybrid Power ◽  
Hybrid Power Source

The need for technological development to reduce the impact of air pollution caused by ships has been strongly emphasized by many authorities, including the International Maritime Organization (IMO). This has encouraged research to develop an electric propulsion system using hydrogen fuel with the aim of reducing emissions from ships. This paper describes the test bed we constructed to compare our electric propulsion system with existing power sources. Our system uses hybrid power and a diesel engine generator with a combined capacity of 180 kW. To utilize scale-down methodology, the linear interpolation method is applied. The proposed hybrid power source consists of a molten carbonate fuel cell (MCFC), a battery, and a diesel generator, the capacities of which are 100 kW, 30 Kw, and 50 kW, respectively. The experiments we conducted on the test bed were based on the outcome of an analysis of the electrical power consumed in each operating mode considering different types of merchant ships employed in practice. The output, fuel consumption, and CO2 emission reduction rates of the hybrid and conventional power sources were compared based on the load scenarios created for each type of ship. The CO2 emissions of the hybrid system was compared with the case of the diesel generator alone operation for each load scenario, with an average of 70%~74%. This analysis confirmed the effectiveness of using a ship with a fuel-cell-based hybrid power source.

scholarly journals Stand Alone 1-MW Microgrid for Remote locations of Armed Forces with PV-Battery-Diesel Generator

2020 ◽  
Vol 10 (1) ◽  
pp. 350-358
Keyword(s):  
Renewable Energy ◽  
Solar Power ◽  
Storage System ◽  
Armed Forces ◽  
Diesel Generator ◽  
Pv System ◽  
Night Time ◽  
Power Requirement ◽  
Remote Areas ◽  
Diesel Generators

Many times, Armed Forces are deployed in bases in remote areas on the borders or Islands, which are far flung areas away from mainland. In many such cases, these areas do not have their power requirements through the main grid supply and entire power requirement of the deployment is supplied by diesel generators. These diesel generators have high environmental impact due to emission of greenhouse gases and are highly uneconomical as logistic sustenance of remote bases for supply of fuel is very challenging, Fossil fuel has to be supplied by vehicles, helicopters, boats or manually carried to hill tops. This increases the overall cost of deploying armed forces in remote areas. In recent years with the advancements in power electronic components and renewable energy, development in Microgrids (MGs) have shown a way to reduce dependency on main power grids. Hence, with the help of MGs, renewable energy can be used to fulfill power requirements of the armed forces deployed in remote places. In this work, a MG with capacity of 1MW has been designed keeping the special needs of armed forces as a major consideration. Solar power has been used as a primary renewable energy source in the proposed design. In order to mitigate the adverse effects of meteorological and extreme conditions on the solar power generation capacity, energy storage system in the form of batteries has also been provided. Batteries store power when excess power is generated from the photo voltaic (PV) system and discharge the power when power demand is higher than the PV generated power. Diesel generator sets have also been used to run critical loads, provide reliability and as backup to critical operations catering for outages, night time needs and un-expected meteorological conditions. MATLAB has been used to design and simulate the proposed MG. Working of the MG has also been demonstrated for varying meteorological and varying load conditions as well. The proposed design works satisfactory in all cases.

Sign in / Sign up

Export Citation Format

Share Document