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This paper proposes a control scheme for a wind turbine using a DFIG electromechanical converter, implemented through an NPC three-level back to back converter, that keeps a unitary power factor injection to the grid and maximizes the energy harvested from wind, using a maximum power point tracking algorithm (MPPT). A predictive direct power control (DPC) strategy drives the grid-side converter, to...
Self-excited induction generators (SEIG) are alternately considered for electricity production in remote villages and rural areas since they have great advantages in term of low cost, less maintenance, and very robust construction features. Most of the SEIG load in the areas is normally lighting and heating. However, the SEIGs are capable of feeding the dynamic loads such as induction motors. The...
The use permanent magnet synchronous generators (PMSG) in wind turbines has been increase considerably in offshore applications due to its efficiency, low maintenance costs and reliability. PMSG's are connected to the grid by means of frequency converters. Generally a back-to-back full converter structure is preferred. This work presents the application of interconnection and damping assignment passivity-based...
This paper presents a new proposal of combining a FACTS device with the fixed speed wind turbine (FSWT) to meet the restrictions found in upcoming grid codes. The applied FACTS device is based on the control strategy of the Dual Unified Power Quality Conditioner - the iUPQC. The power stage of the iUPQC consists of two converters connected back-to-back. One of them is connected in series and the other...
A new control of a grid connected permanent magnet synchronous generator (PMSG) for wind turbines based on the Instantaneous Power Theory (pq Theory) is proposed. Given the PMSG trapezoidal electromotive force (EMF), the proposed pq control is advantageous over those based on the Park transformation, because it reduces the electromagnetic torque ripple and eliminates the calculation of sinusoidal...
This paper presents the performance study of a speed sensor-less control of grid connected DFIG based variable speed Wind Energy Conversion System (WECS). A new phase locked loop (PLL) based slip speed estimator using rotor current is proposed for speed sensor-less stator field oriented vector control operation of rotor side converter (RSC) to ensure decoupled control of stator active and reactive...
Now a days the entire world is considering an escalating demand for electrical energy as a consequence of the hasty population augmentation. The superior penetration of wind energy technology for electrical power production has been growing since past decade due to the unique impressive features of wind technology viz. pollution free, cost effective, low initial cost, less maintenance requirement...
Wind energy conversion system (WECS) technology has been evolved from conventional driven to optimized driven in recent years. For unique features of PMSG like high power density, less maintenance requirement in comparison to the other kind of machine, it is pioneering in the WECS technology. In this paper modeling of PMSG and PWM converter have been explored well. The control of PMSG in its machine...
This paper presents an experimental implementation of a predictive control strategy for a system made up of two induction machines fed by a six-leg indirect matrix converter. The objective is to evaluate the practical feasibility of this method, considering the large computational cost, and to incorporate available market technologies. This strategy achieves tracking of torque, speed, and flux references...
Recently Line Start Permanent Magnet Motor (LSPM) is a well-known motor due to its technical advantages in academic and industrial sector. The LSPM combines a permanent magnet rotor that allows higher motor efficiency during synchronous operation, and an induction motor squirrel cage rotor for starting the motor by connecting it directly to an A.C. Source. In this paper, we will deal with the efficiency...
Flux-modulation power-split devices for hybrid electrical vehicle (HEV)s have been obtaining attentions in recent years due to its brushless and high torque density. However, the flux-modulation power-split devices always suffered from low power factor, which is even lower than 0.6 and results in higher cost and larger volume in the converter. This paper proposes a novel dual mechanical port, spoke...
For cost-effective concern, how to reduce the usage amount of the rare-earth permanent-magnet (NdFeB) in an IPMSM has become an important research issue [1]. Fortunately, the less permanent-magnet synchronous motor (PM-Less SM) with confusing rotor flux barriers and clever permanent-magnet arrangement has the potential to become high-performance motor, as shown in Fig.1. The main advantage is through...
Recently, the demand for developing high performance electric machines which are free of rare earth magnets are becoming more and more attractive since the raw materials in the rare earth magnets suffer the challenge of increased price and limited supply [1]. In particular, the ferrite-assisted synchronous reluctance machines (FA SynRMs) are regarded as one competitive candidate which incorporate...
Owing to getting rid of brushes and slip rings, the magnetic-field modulated brushless double-rotor machine (MFM-BDRM) can be a promising candidate for the electrical-continuously variable transmission (e-CVT) in hybrid electric vehicles (HEVs). However, since there are many magnetic-field harmonics with the high rotating speed in the air gap, the PM loss is a big problem in traditional MFM-BDRMs...
The permanent magnet vernier machine (PMVM) has been proposed as a suitable alternative for direct-drive applications due to its high torque feature at a low operated speed, where the usage of high-torque low-speed motor can effectively eliminate the additional cost and losses caused by gearbox. One effective design as a dual-stator PMVM with spoke-type PMs in rotor has been developed for both high...
New variable-speed drives with improved-design synchronous reluctance machines may now be capable of reaching high efficiency, even up to the IE4 level [1]. These machines have been studied for many years and significant progress was made in the 1990s using axial laminations in the rotor [2]. At that time, the technology was reviewed and identified, in principle, as a viable alternative [3]. However,...
Vernier reluctance machines with stator DC field winding (DC-VRMs) are a kind of novel synchronous machines, which employ a doubly salient structure and their innovation are stator concentrated DC winding to generate exciting field [1-2]. Compared with rotor wound field machines or PM excited in stator/rotor synchronous machines, this machines are characterized with low cost due to no PMs, robust...
The purpose of this paper is to provide a detailed design comparison of an axial flux induction machine t viewed as a decoiled version of radial flux machine. A one to one comparison is made between the axial and radial flux machine geometry to bring out the impact on torque to volume ratio. Quantitative analysis is presented to determine the developed torque, power factor, efficiency, mass, volume...
Two main drawbacks of flux reversal machines (FRMs) are high cogging torque and low power factor, among which the latter one has not been addressed. This paper proposes an analytical method based on winding function theory to analyze the power factor of a FRM. Firstly, the back-EMF, synchronous inductance and power factor of a FRM are derived. With the employment of the equations, the main reason...
If the drive is designed based on the requirements for efficiency, it is necessary to check out effectiveness of control methods and design solutions at the modeling stage. For this purpose numerical model should provide measurements of the instantaneous values of efficiency. This paper offers method which allows calculations of the instantaneous efficiency of permanent magnet synchronous machine...
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