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In this paper, a method for minimizing the fuel consumption in a diesel generator set using a wound rotor synchronous generator (WRSG) is introduced. The proposed method uses direct monitoring of fuel flow rates and generator output to actively search for an optimal stator voltage. By weakening the field of the WRSG, the overall efficiency of the system is increased. Simulation models of the diesel...
Oscillatory nature of the ocean waves lead to intermittent power generated by the wave energy converters (WECs). As a result, WECs face a major barrier for grid integration. The recently introduced undersea storage system (USS) offers a viable solution to overcome this barrier by smoothing the WEC output power fluctuations. Another, but related, issue is that since the output voltage of WECs are relatively...
In this paper, reluctance synchronous machines are designed and optimised to operate in the 5 MW power range for the implementation as wind generators. It is shown, when assuming no rotor deformation, that reluctance synchronous generators can be comparatively designed to operate in this power range with power factors higher than 0.8 achieved. In order to further improve the machine performance, an...
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.
The concentrated winding is the common winding method used in the conventional permanent magnet flux reversal machines (FRPM). In this paper a distributed winding for FRPM as a generator is proposed. To investigate the advantages of the proposed machine a comparative analysis of both the distributed and the concentrated winding for FRPM is performed. The output voltage waveforms of both machines are...
This contribution presents the control of the variable speed wind energy conversion systems. It is based on a six-phase symmetrical induction generator combined to a matrix converter. Rotor flux vector control algorithm and a scalar strategy modulated matrix converter are used to control the wind energy conversion system. Characteristics of the matrix converter are used for maximizing the power tracking...
This paper presents a special two-phase transverse flux machine with disc rotor. Because of the noncomplex construction and by using simple 2D flux path and 3D printing methods the manufacturing costs are hold low. A design criterion is proposed for maximizing the torque density in the low speed range. To prove the concept and analyse the potential of this construction a first direct driven prototype...
Piezo-electric motors are interesting candidates and a good alternative solution to electromagnetic actuation. A limited number of mechanical components is required which leads to simple and compact designs. A high resolution and repeatability can be reached. They do not generate noise nor magnetic fields which make them easy to integrate in different environments. Nevertheless, some limitations remain...
The US Navy is presently developing a number of new advanced electrical loads for deployment upon future vessels. Many of these loads will require high power supplied in a transient manner for successful operation. The transient nature brings about unique challenges to the shipboard power system that have not been previously faced. Traditional power generation sources alone, such as diesel and gas...
Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis...
This, paper proposes a dual-stator high temperature superconductor (HTS) reluctance-rotor brushless doubly-fed wind generator, which owns two stators and one salient reluctance rotor sandwiched between two stators. Two sets of windings with different pole-pairs locate on the two stators, separately, named as control winding and power winding. The modulation of reluctance rotor makes two sets of windings...
This paper investigates the flux density and radial force spatial harmonics in large salient pole synchronous hydro-generators. Vibration due to magnetic forces are mainly caused by low order harmonics in the airgap flux density distribution. The influence of winding layout and airgap length on the lowest order radial force component are analysed. Airgap flux density and radial force density distributions...
This paper analyzes power generation from sea waves by using power conditioning system and linear permanent magnet generator. A buoy is placed on the ocean surface and connected to the linear generator. The wave energy is carried out from the movement of a buoy. An electrical conversion system is needed between the generator and the grid. For an analysis of the power system, the modeling of the linear...
This paper investigates the influencing factors and mechanism of sub-synchronous resonance (SSR) phenomenon in the doubly fed induction generator (DFIG) based wind turbines to a series compensated transmission system. First, a model of DFIG-based wind power unit interconnected with series compensated networks is developed to analyze the mechanism of induction generator effect (IGE) and sub-synchronous...
The present paper proposes an innovative control scheme for a fully rated wind generating unit equipped with a permanent magnet synchronous generator. The main objective of this control strategy is that of allowing a decoupled and dynamically performing control of active power (by the MPPT curve) and reactive power at the point of interconnection to the grid. Moreover, the control will be able to...
This article proposes a different way of studying the performances of the structure of permanent magnet synchronous generator for small wind turbine. Thus, we make the two-dimensional study of the synchronous buried permanent magnet generator with flux concentration. It will be a question of studying the influence of the geometrical parameters of this generator on its performances: Effective no load...
In this paper we present some aspects about the design of a small permanent magnet wind generator with axial magnetic flux often used in residential wind turbine. There are presented the main steps of the magnetic and electric calculations with applications to a specific case: 0.6 kVA wind generator, and the finite elements analysis of the excitation magnetic field generated by permanent magnets....
In recent years, there has been a large increase in power demand without corresponding increase in power generation. With the issues around global warming, the use of renewable energy such as wind and solar has gained popularity. Renewable energy is clean, sustainable (will never run out), environmentally friendly. In addition, it requires a relatively low maintenance and running costs. Many countries...
The article presents an approach to the design of synchronous machines with permanent magnets on the rotor (variable pole). This approach involves initial determination of the rotor diameter at the permissible circumferential speed on the outer surface. Further, it determines the size of the rest of the main machines on the basis of electromagnetic loads, and other relations are adopted in the design...
Generic models provided by the recently released IEC 61400-27-1 have involved the development of a new area of study, that intends to approximate the behavior of these models to field data or to previously tested models. In order to have a better understanding of the operation of these models, the simplification that is followed to obtain the generator system based on a DFIG configuration is shown...
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