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The advent of pulsed-power loads puts a large amount of stress on ship power systems. Naval applications of pulsed-power loads include energy weapons and radars which often demand more power than what is available through the local, dedicated generation. Incorporating loads and sources in a single power system proves beneficial for these systems; however, generators cannot be the only source due to...
Recently, DC distribution has been more and more considered in shipbuilding industry as an emerging solution due to its potential to enhance the system performance in terms of fuel economy, reliability, volume and weight. Moreover, there is a growing trend to integrate alternative power sources (APSs) and energy storage systems (ESSs) into next-generation ships, and thus reducing cost and emission...
This paper presents comparative evaluation and explores the different technologies suitable for the implementation of the Medium Voltage Direct Current (MVDC) electrical supplies for the marine on-board electrical distribution network. To realize the MVDC supply in the range from 5 kV to 25 kV, various technological choices are available during the design process and have a direct influence on the...
The more electric aircraft concept is pushing towards a DC distribution system for the on-board electrical appliances. In the scenario where multiple high-voltage and low-voltage buses are present, a power electronics converter interface is mandatory. In order to implement a resilient distribution system, the power exchange between different buses is envisaged, to ensure that a failure in a supply...
This paper is dedicated to apply Hilbert-Huang Transform (HHT) method on fault detections of a multi-phase generator — diode rectifier set. The system structure, principle of the HHT, and part of the fault detection simulation results are shown in this paper. The applicability of HHT on fault diagnosis of a multi-phase machine system is illustrated by analyzing the simulation results.
This paper deals with a control strategy of a grid-connected marine current energy conversion system driven by a 5-phase permanent magnet synchronous generator. A supercapacitor is used as an energy storage device in order to smooth the output power and improve the low-voltage ride-through capability of the energy conversion system. The proposed approach is based on a model predictive approach with...
For small scale off-grid wind-solar-diesel hybrid generations with energy storage (WHGES), it is necessary to coordinate the operation of generation units and energy storage unit to maintain the voltage constant and supply the loads. This paper proposes a low cost charging scheme for off-grid WHEGES with 48V DC bus voltage. It is possible to realize the dynamic charging control of the storage unit...
Dynamic programming is an effective technique for the evaluation of the potential of optimal fuel consumption of drive trains, as it guarantees a globally optimal solution. This paper investigates two major problems associated with the application of dynamic programming. The first problem is the high computational complexity. Iterative dynamic programming is proposed as an alternative to dynamic programming...
The optimization of electrical machines can be managed using advanced computational intelligence algorithms. These algorithms can speed up the design phase and can improve the performances, being able to find out the optimal design also in problems involving a large number of physical and geometric parameters. In this paper, a new population based metaheuristic algorithms, named Social Network Optimization...
Compared with onshore wind turbines, fault detection and isolation (FDI) process is more important for offshore ones due to both additional loadings and maintenance difficulties. FDI will be more demanding when it comes to deep-sea floating wind turbines. In this work, an ensemble learning method, random forests (RF), is proposed to perform fault detection of offshore wind turbines, as RF is robust...
In this paper, after a brief introduction on the proposed plug-and-play (PnP) process monitoring and control system, two online configuration approaches are proposed for the observer-based residual generator. Firstly, an adaptive residual generator is developed based on the adaptive observer scheme. Aiming at higher feasibility and reliability of industrial application, an iterative learning approach...
Energy saving is a main concern of telecom operators to reduce TCO and improve market competition. Normally, single generator reaches the best fuel consumption rate when it works under 70%–85% loading rate. But in certain scenarios, the capacity of existing generator is not enough, thus more than one generator will work in parallel in the same hybrid power supply system; for instance in site sharing...
This paper presents a comprehensive overview of power converters and their control techniques for AC microgrids. The aim is to give an insight and direction for researchers and applications on promising topologies, control, and application within future smart grid. The paper first focuses on presenting various power converter topologies used in AC microgrids. Then, suitable control techniques for...
In order to optimize aircraft performance and decrease operating and maintenance costs, traditional aircraft is moving towards a more electric aircraft. Moreover, integrated starting/generating system is one of the key components in a more electric aircraft. To determine whether starting/generating system meets the intended requirements, it is necessary to test the system. Herein, this paper is going...
In this paper, a novel current sharing control strategy, named module link, is used to realize multiple modules paralleled. To achieve this goal, there are three full-bridge phase-shift converters are used as three modules and connected in parallel to feed the load. In this study, three phase-shift control integrated circuits, named UCC28950 made by Texas Instruments Co., are used to control individual...
This paper proposes a novel distributed control scheme for DC microgrids to acquire minimum generation cost and recover the global average voltage with consideration of capacity constraints. Our main focus is on constrained problems where the power of each distributed generator (DG) is restricted to lie in the feasible region. In this paper, a global load observer (GLO) is introduced that uses neighbor's...
Recent technological advances allowed the word to construct several wearable products that can capture and process the human body bio-signals. The PPG signal becomes one of the most contenders in heart rate monitoring due to their prominent features, flexibility, effectiveness and low costs. This paper present a novel System of PPG Heart rate calculation based on FPGA, using the Pan and Tompkins as...
In this paper simulation studies have been conducted using Simulink/MATLAB software in order to investigate the impact of STATCOM on the positive-offset mho element loss of excitation (LOE) protection scheme in synchronous generator. The obtained results show that the operation of the positive-offset protection scheme takes more time under the integration of STATCOM in the transmission line. Moreover,...
Synchronous machines exhibit, under normal operating conditions, torque oscillation problems. This work presents a study that proposes a methodology for the reduction of these oscillations. It was tested in a synchronous generator powered environment with DC voltage supplying power to a common bus in permanent regime, this bus has the presence of a nonlinear load. There are oscillating components...
The lack of automatic diagnostics of slowly changing processes inherent in water turbines in hydroelectric power plants can cause costly errors and accidents. Emerson provides the solution which can detect and monitor these factors.
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