scholarly journals Scheduling of Diesel Generators Operation with Restricted PCC in Microgrid

2021 ◽  
Vol 17 (2) ◽  
pp. 108-119
Author(s):  
Nabil Aklo ◽  
Mofeed Rashid
Keyword(s):  
Power Systems ◽  
Energy Cost ◽  
Time Horizon ◽  
Electrical Power ◽  
Cost Effective ◽  
Energy System ◽  
Optimization Method ◽  
Renewable Energy Resources ◽  
Electrical Power Systems ◽  
Diesel Generators

Smart Microgrid (MG) effectively contributes to supporting the electrical power systems as a whole and reducing the burden on the utility grid by the use of unconventional energy generation resources, in addition to backup Diesel Generators (DGs) for reliability increasing. In this paper, potential had been done on day-ahead scheduling of diesel generators and reducing the energy cost reached to the consumers side to side with renewable energy resources, where economical energy and cost-effective MG has been used based on optimization agent called Energy Management System (EMS). Improved Particle Swarm Optimization (IPSO) technique has been used as an optimization method to reduce fuel consumption and obtain the lowest energy cost as well as achieving the best performance to the energy system. Three scenarios are adopted to prove the efficiency of the proposed method. The first scenario uses a 24 hour time horizon to investigate the performance of the model, the second scenario uses two DGs and the third scenario depends on a 48-hour time horizon to validating the performance. The superiority of the proposed method is illustrated by comparing it with PSO and simulation results show using the proposed method can reducing the fuel demand and the energy cost by satisfying the user’s preference.

Earthquake Experience Data Point to Benefit of Diverse Backup Power

2014 ◽  
Author(s):  
David J. Calhoun ◽  
Mark A. Gake
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Nuclear Power ◽  
Power Plants ◽  
Electrical Power ◽  
Electrical Power Systems ◽  
Common Mode ◽  
Failure Risk ◽  
Diesel Generators ◽  
The Individual

Operating nuclear power plants typically have backup electrical power supplied by diesel generators. Although backup power systems are designed with redundant trains, each capable of supplying the power requirements for safe shutdown equipment, there is a common-mode seismic failure risk inherent in these customary backup power arrangements. In an earthquake, multiple equipment trains with similar, if not identical, components located side-by-side are exposed to inertial forces that are essentially identical. In addition, because of their similar subcomponent configurations, seismic fragilities are approximately equal. In that case, the probability of multiple backup power system failures during an earthquake is likely to be dependent on, and nearly the same as, the individual seismic failure probability of each equipment train. Post-earthquake inspections at conventional multiple unit power stations over the last 40 years identified this common-mode seismic failure risk long before the tsunami-related common-mode failures of diesel generators at Fukushima Daiichi in March 2011. Experience data from post-earthquake inspections also indicate that failure probabilities of diverse sets of power generation equipment are independent and inherently less susceptible to common-mode failures. This paper demonstrates that employing diverse backup power designs will deliver quantifiable improvements in electrical system availability following an earthquake. These improvements are illustrated from available literature of post-earthquake inspection reports, along with other firsthand observations. A case study of the seismic performance of similarly configured electrical power generation systems is compared to the performance of diverse sets of electrical power systems. Seismic probabilistic risk analyses for several system configurations are presented to show the benefit of improved post-earthquake availability that results from designing new backup power systems with greater diversity.

scholarly journals Hardware-in-the-Loop and Digital Control Techniques Applied to Single-Phase PFC Converters

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1563
Author(s):  
Paula Lamo ◽  
Angel de Castro ◽  
Alberto Sanchez ◽  
Gustavo A. Ruiz ◽  
Francisco J. Azcondo ◽  
...  
Keyword(s):  
Power Systems ◽  
Digital Control ◽  
Single Phase ◽  
Electrical Power ◽  
Cost Effective ◽  
Power Converter ◽  
Hardware In The Loop ◽  
Electrical Power Systems ◽  
Electrical Grid ◽  
Control Techniques

Power electronic converters for power factor correction (PFC) play a key role in single-phase electrical power systems, ensuring that the line current waveform complies with the applicable standards and grid codes while regulating the DC voltage. Its verification implies significant complexity and cost, since it requires long simulations to verify its behavior, for around hundreds of milliseconds. The development and test of the controller include nominal, abnormal and fault conditions in which the equipment could be damaged. Hardware-in-the-loop (HIL) is a cost-effective technique that allows the power converter to be replaced by a real-time simulation model, avoiding building prototypes in the early stages for the development and validation of the controller. However, the performance-vs-cost trade-off associated with HIL techniques depends on the mathematical models used for replicating the power converter, the load and the electrical grid, as well as the hardware platform chosen to build it, e.g., microprocessor or FPGA, and the required number of channels and I/O types to test the system. This work reviews state-of-the-art HIL techniques and digital control techniques for single-phase PFC converters.

scholarly journals Decentralized Power Management for Electrical Power Systems in More Electric Aircrafts

Electronics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 187 ◽  
Author(s):  
Myungchin Kim ◽  
Sung Lee ◽  
Sungwoo Bae
Keyword(s):  
Power Systems ◽  
Power Management ◽  
Electrical Power ◽  
Transient State ◽  
Cost Effective ◽  
Power Sharing ◽  
Management Approach ◽  
Electrical Power Systems ◽  
Power Sources ◽  
Virtual Impedance

In order to implement reliable and flexible power management among energy sources, a decentralized power management approach for electrical power systems (EPSs) in the more electric aircraft (MEA) is studied. Considering the increased use of electrical power for various functions, the performance of MEA would be determined by the design and operation of the EPS. By using a virtual impedance that includes both a resistive term and an inductive term, autonomous power sharing is realized. Because of the frequency dependence in the virtual impedance, different power sharing ratios between steady state and transient state can be considered. Not only the operation of various power sources is coordinated without supervision of a centralized controller, but also the operation profile of each source can be adjusted to meet output characteristics of each source. To demonstrate the effectiveness of the proposed approach, a series of simulations that consider various virtual impedance configurations were conducted. The proposed approach contributes to a higher level of operational flexibility, while enabling reliable and cost-effective management of MEAs.

Voltage Quality in Electrical Power Systems

2001 ◽  
Author(s):  
J. Schlabbach ◽  
D. Blume ◽  
T. Stephanblome
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Electrical Power Systems ◽  
Voltage Quality

Stability study of electrical power systems modelled with half-order systems

2008 ◽  
Vol 42 (6-8) ◽  
pp. 911-922 ◽  
Author(s):  
Delphine Rui ◽  
Nicolas Retière ◽  
Octavian Entcheanu
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Stability Study ◽  
Electrical Power Systems
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