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This paper describes the experimental study of a synchronous magnetoelectric generator which magnetic system is based on the asynchronous motor: the stator of magnetoelectric generator is made up of induction machine with a number of poles pairs 2p=12, a cylindrical inductor (rotor) is composed of permanent magnets distributed on the rotor surface. The modeling of magnetic system was carried out using...
For power system operation, transient stability analysis is indispensable. Of late, electric power systems have become more complicated; thus, fast transient stability analyses are critical for online computations. In this paper, we apply the Taylor series expansion to a time domain equal-area criterion applicable to multimachine systems and propose a fast transient stability analysis method that...
The paper considers the principle of stabilization for the rotation speed with the use of a magnetic CVT in the form of a magnetic gearbox providing the required reduction coefficient. The paper is devoted to investigations of transients in a autonomous power system consisting of wind turbines with synchronous generators with permanent magnets under sudden change wind speed. The investigation involves...
Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
This paper presents the design and implementation of a robust drive train torque control for rotor inertia emulation in a dynamometer test bench application. The controller is part of a hardware-in-the-loop (HiL) framework for a 50 kW small test rig that enables a real-time interaction between test rig drive train and a rotor model. The control objective is to compensate undesired dynamics of the...
This paper presents a new configuration of an off-grid single-phase generator using a three-phase induction machine. The use of this kind of machine, cheap and robust, is in line with the “jugaad” philosophy, better known as frugal innovation. In such an application, three-phase induction machines are usually operated as stand-alone single-phase generator which are either self-excited using terminal...
This paper presents test results of the control of a pole-modulated permanent magnet synchronous generator (PM-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). Due to the low speed of the WEC, the size of the generator is increased and the machine is designed with large number of poles and concentrated winding. The electromotive...
In an Organic Rankine Cycle (ORC) systems, the Permanent Magnet (PM) generator is directly coupled to high-speed turbine shaft, in order to increase system efficiency avoiding introduction of gear-box. On the other hand, current time harmonics induce high frequency currents in rotor parts, which cause a temperature increase. PMs are strongly affected by the operating temperature, since both remanence...
This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces...
This paper introduces a new configuration of wind turbine drivetrain that collects energy from two interconnected wind turbines. Hydrostatic transmission is utilized to collect the energy and transfer it to a ground-level generator. A mathematical model of the system is obtained and utilized in the control of generator speed and tracking of the maximum power point. Variable displacement pumps and...
The paper analyzes the capability of synchronous reluctance generators to achieve successful self-excitation when operating in stand-alone systems. To initiate the self-excitation process, the machine steel core has to retain sufficient residual flux during the generator start-up. This residual flux depends on the magnetic properties of the machine core as well as the previous machine operating condition...
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...
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...
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...
With the vigorous development of new energy sources, wind power generation technology has been developed rapidly. Due to the reverse distribution of wind energy resources and load centers, large-scale wind power transmission is inevitable. Using series capacitor compensation technology is an effective measure to complete large-scale wind power transmission, but may induce sub-synchronous oscillation...
Today, electrical innovation is the most needed both for own use and for industry. Therefore, researchers create various innovations to improve efficiency. There are so many innovations being developed that the efficiency of the power plant can be improved. One such innovation is the use of turning gear operations in generation to rejuvenate generator turbines and improve efficiency. The purpose of...
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 paper discusses high-voltage, high-speed permanent magnet generators and their possible applications: space and aviation aircrafts, ships, mobile installations, etc. The main qualitative criteria for the electrical machinery power supply systems for spacecraft are determined. Different design topologies of the high-voltage, high-speed permanent magnet generators are reviewed and the optimal option...
This paper presents a research regarding a special design for a micro-wind turbine that drives a permanent magnet generator with two rotors that spin in opposite directions and recovering the energy by intermediate of brushes-rings system. The aim of this study is to develop and prove the functionality of a two rotors counter rotating permanent magnet generator by comparative results between the finite...
This paper deals with the design and application of an emulator to reproduce the dynamic behavior of of tidal turbines to feed a remote load. The proposed emulator provides a flexible platform to investigate different operating conditions of the tidal turbine, and supervise the system variables in real time. Simulation and experimental results are presented to validate the proposed emulator and illustrate...
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