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

2021 ◽  
Vol 4 (1) ◽  
pp. 1-1
Author(s):  
Raisa Barbosa ◽  
◽  
Mohamad Issa ◽  
Sidelmo Silva ◽  
Adrian Ilinca ◽  
...  
Keyword(s):  
Power Systems ◽  
Greenhouse Gases ◽  
Electric Power ◽  
Power Electronics ◽  
Fuel Efficiency ◽  
Electric Energy ◽  
Induction Generator ◽  
Variable Speed ◽  
Synchronous Generators ◽  
Electric Generators

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.

scholarly journals Energy As A Weapon - Architecture Reloaded

2019 ◽  
Author(s):  
N Smith
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Power Electronics ◽  
Power Management ◽  
Energy Management ◽  
Variable Speed ◽  
Energy Stores ◽  
Directed Energy ◽  
Fast Acting

There has been a recent shift on ships power systems away from power management to energy management, due to the increasing use of Energy Storage fast acting power electronics convertors. This paper discusses the general shift in architecture to accommodate this, primarily to gain efficiency and resilience, covering items such as advanced AC and affordable DC networks, Shared, Centralised or Localised Energy Stores, Variable Speed generation, Energy Management vs Power Management. It also considers how to accommodate directed energy weapons on future and existing power systems in the Naval Arena. It outlines the broad options for efficiency and the supporting architectures without delving too much into the detail. Architecture reloaded, as we take a step back to evaluate the system solutions, to accommodate Energy, rather than Power as a weapon.

Energy Challenge, Power Electronics & Systems (PEAS) Technology and Grid Modernization

2019 ◽  
pp. 116-129
Author(s):  
Geetha R ◽  
Gowdhamkumar S ◽  
Yamuna ` R ◽  
S Jambulingam
Keyword(s):  
Energy Consumption ◽  
Power Systems ◽  
Electric Power ◽  
Power Electronics ◽  
Power Grid ◽  
Modern Society ◽  
Electric Power Systems ◽  
Electric Power System ◽  
Total Energy Consumption ◽  
Energy Challenge

Modern society has reached a point where virtually every crucial economic and social function depends on the secure and reliable operation of the electrical power and energy infrastructures. The energy consumption growth and the population growth are pushing world’s total energy consumption to double by 2050. This represents grand challenges and opportunities for power electronics and electric power systems engineers to modernize the power grid. Power electronics & systems (PEAS) technology is increasingly important for smarter distributed systems, particularly for power grid modernization. This paper discussed smart technology solutions, such as PEAS, for the changing nature of the electric power system. Specific technical challenges that are facing the power electronics and electric power systems communities are then elaborated. It is shown that we can meet the grand energy challenge by lever-aging the grid modernization efforts. To provide electric power to twice as many people does not have to increase the required environment footprint.

scholarly journals State-Space Modeling Techniques of Emerging Grid-Connected Converters

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4824
Author(s):  
Fabio Mandrile ◽  
Salvatore Musumeci ◽  
Enrico Carpaneto ◽  
Radu Bojoi ◽  
Tomislav Dragičević ◽  
...  
Keyword(s):  
Power Systems ◽  
State Space ◽  
Power Electronics ◽  
Synchronous Generators ◽  
Control Techniques ◽  
Space Modeling ◽  
Modeling Techniques ◽  
State Space Modeling ◽  
Grid Connected Converters ◽  
Practical Accuracy

In modern power electronics-based power systems, accurate modeling is necessary in order to analyze stability and the interaction between the different elements, which are connected to it. State space modeling seems a valid approach to study the modes of a certain system and their correlation with its states. Unfortunately, this approach may require complicated calculations and it is difficult to model advanced or emerging control techniques for grid-tied converters, such as cascaded controllers (e.g., voltage and current) and virtual synchronous generators (VSGs). Moreover, this approach does not allow an easy reconfiguration of the modeled system by adding, removing of modifying certain elements. To solve such problems, this paper presents a step-by-step approach to the converter modeling based on the Component Connection Method (CCM). The CCM is explained in detail and a practical example is given, by modeling one exemplary VSG model available in the literature. The obtained model is finally validated experimentally to demonstrate the practical accuracy of such approach.

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