Variable speed and stop-start techniques for engine-generators

Tibola, Jonas Roberto; Hausen, Roberto B.; Martins, Mario; Pinheiro, Humberto

doi:10.1109/cobep.2015.7420112

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…These projects aim to control system outputs considering variable rotor speed according to the required engine torque to meet maximum efficiency [69]. The solution proposed in [70] uses a fixed Capacitor-Thyristor controlled method to evaluate system stability during load variation. The goal is to maintain the frequency and voltage constant while PMSG is running in a stand-alone microgrid.…”

Section: Diesel-driven Permanent Magnet Synchronous Generatormentioning

confidence: 99%

Variable Speed Diesel Generators: Performance and Characteristic Comparison

2022

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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.

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Section: Diesel-driven Permanent Magnet Synchronous Generatormentioning

confidence: 99%

Variable Speed Diesel Generators: Performance and Characteristic Comparison

2022

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“…Many studies propose different control strategies for these generator sets to improve the system's efficiency [53][54][55][56][57][58][59][60][61][62][63][64]. In these studies, the power flow extracted from the engine through the generator is controlled by the electronic power converter.…”

Section: Diesel-driven Permanent Magnet Synchronous Generatormentioning

confidence: 99%

“…In [60], the generator engine group consists of an internal combustion engine, a synchronous generator with permanent magnets, a battery bank, and static converters, as shown in Figure 8. The topology is composed of a back-to-back converter, a two-way interleaved boost converter connected to a battery bank, a dc bus, and the synchronous permanent magnet generator (PMSG) [61].…”

Section: Diesel-driven Permanent Magnet Synchronous Generatormentioning

confidence: 99%

“…The batteries operate as an energy buffer between the generator and the output load with this arrangement. Thus, unnecessary torque/speed transients are avoided at the engine, implying greater fuel consumption [60]. The rotation of the internal combustion engine, directly coupled with the synchronous generator, is controlled through a closed-loop injection system to follow an optimal speed reference.…”

Section: Figurementioning

confidence: 99%

“…Despite this characteristic, VSDG technologies that use power converters are the most widespread solutions today. They are present in applications connected to the grid [48,49] or isolated regions [46,[52][53][54][55][56][57][58][59][60][61][62]. These technologies are widely studied, and many projects develop control strategies to ensure the best efficiency of these systems, with the lowest fuel consumption.…”

Section: Comparison Of Vsdg Technologies According To Possible Applic...mentioning

confidence: 99%

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Variable Speed Diesel Electric Generators: Technologies, Benefits, Limitations, Impact on Greenhouse Gases Emissions and Fuel Efficiency

Barbosa¹,

Issa²,

Silva³

et al. 2021

JEPT

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A substantial share of the electric energy is generated with synchronous generators that provide sustained alternating current (AC) voltage and frequency energy to regional and national power systems, which subsequently transport and distribute it to diverse users. In an attempt to reduce environmental effects, electric energy markets have recently become more open, resulting in more flexible distributed electric power systems. In such distributed systems, stability, quick and efficient delivery, and control of electric power require some degree of power electronics control to allow for lower power in the electric generators to tap the primary fuel energy potential better and increase efficiency and stability. This is how variable-speed electric generators (VSEG) recently came into play, up to the 400-megavolt ampere (MVA)/ unit size, and which have been at work since 1996. This paper provides coverage of variable-speed electric diesel generators (VSDEG) in distributed generation and their impacts on fuel efficiency and greenhouse gases (GHG). It discusses permanent-magnet-(PM) synchronous generators, solutions based on power electronics such as diesel-driven wound-rotor-induction generator, doubly-fed-induction generator (DFIG), rotating stator generator, and the application of continuously variable transmission to a VSEG. The benefits and limitations of the selected technologies are also presented. The list of references given at the end of the paper should offer aids for students and researchers working in this field.

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