Modeling, Analysis and Enhancement of the Performance of A Wind Driven DFIG During Steady State and Transient Conditions

Modeling, Analysis and Enhancement of the Performance of A Wind Driven DFIG During Steady State and Transient Conditions

eBook - 2014
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papers that are entitled 'Enhancement of Fault Ride Through Capability of Wind Driven DFIG Connected to the Grid' published by the Journal of Engineering Sciences, 'Novel Scheme for Improving the Performance of a Wind Driven DFIG During Grid Fault' published by the multi-science publishing website, and 'Field Orientation Control of a Wind Driven DFIG Connected to the Grid' that was published by the WSEAS publishing academy.
power generation had been adopted. In one of them a permanent magnet synchronous generator was connected to a three-phase rectifier followed by boost converter. In this case, the boost converter controls the electromagnet torque. One drawback of this configuration is the use of diode rectifier that increases the current amplitude and distortion of the PMSG [5]. As a result this configuration has been considered for small size wind power system (WPS) (smaller than 50 kW). In another scheme using PMSG, the PWM rectifier is placed between the generator and the DC link, while another PWM inverter is connected to the network. The advantage of this system regarding the use of field orientation control (FOC) is that it allows the generator to operate near its optimal working point in order to minimize the losses in the generator and power electronic circuit. However, the performance is dependent on the good knowledge of the generator parameter that varies with temperature and frequency. The main drawbacks, in the use of PMSG, are the cost of permanent magnet that increase the price of machine, demagnetization of the permanent magnet material and it is not possible to control the power factor of the machine [6]. Biographische Informationen Mohmoud Mossa has been teaching undergraduate courses in electrical engineering at the Faculty of engineering, Minia University, Egypt since 2009. Thereby, he specializes in electrical machine, electrical machines and control laboratory, control, power electronics, PLC programming and applications, protection, and electronic measurements. The author is the trainer and supervisor of the Lab. of Tractions and Drives (Siemens Lab), and supports professors in the design of projects, and the in the supervision of students. Further, Mohmoud Mossa is the author of several publications. For instance, he has published research
integration of wind energy conversion system [3]. Generally, wind power generation uses either fixed speed or variable speed turbines, the main configurations of generators and converters used for grid connected variable speed wind power system (WPS) are presented in the following sections: 2.2, Synchronous Generators Driven by a Wind Turbine: A synchronous generator usually consist of a stator holding a set of three-phase windings, which supplies the external load, and a rotor that provides a source of magnetic field. The rotor may be supplied either from permanent magnetic or from a direct current flowing in a wound field. 2.2.1, Wound Field Synchronous Generator (WFSG) Driven by a Wind Turbine: The stator winding is connected to network through a four-quadrant power converter comprised of two back-to-back sinusoidal PWM. The machine side converter regulates the electromagnetic torque, while the grid side converter regulates the real and reactive power delivered by the WPS to the utility. The Wound Field Synchronous Generator has some advantages that are: The efficiency of this machine is usually high, because it employs the whole stator current for the electromagnetic torque production [3]. The main benefit of the employment of wound field synchronous generator with salient pole is that it allows the direct control of the power factor of the machine, consequently the stator current may be minimized at any operation circumstances. The existence of a winding circuit in the rotor may be a drawback as compared with permanent magnet synchronous generator. In addition, to regulate the active and reactive power generated, the converter must be sized typically 1.2 times of the WPS rated power [4]. 2.2.2, Permanent-Magnet Synchronous Generator (PMSG) Driven by a Wind Turbine: Many configuration schemes using a permanent magnet synchronous generator for
induction machine with soft start are long gone. We are now able to control the real and reactive power of the machine, limit power output and control voltage and speed [1]. There is a lot of research going on around the world in this area and technology is being developed that offers great deal of capability. It requires an understanding of power systems, machines and applications of power electronic converters and control schemes put together on a common platform. Unlike a conventional power plant that uses synchronous generators, a wind turbine can operate as fixed-speed or variable-speed. In a fixed-speed wind turbine, the stator of the generator is directly connected to the grid. However, in a variable-speed wind turbine, the machine is controlled and connected to the power grid through a power electronic converter. There are various reasons for using a variable-speed wind turbine: i. Variable-speed wind turbines offer a higher energy yield in comparison to constant speed turbines. ii. The reduction of mechanical loads and simple pitch control can be achieved by variable speed operation. iii. Variable-speed wind turbines offer acoustic noise reduction and extensive controllability of both active and reactive power. iv. Variable-speed wind turbines show less fluctuation in the output power [1] and [2]. The use of renewable energy sources for electric power generation is gaining importance in order to reduce global warming and environmental pollution, this is in addition to meeting the escalating power demand of the consumers. Among various renewable energy technologies, grid integration of wind energy electric conversion system is being installed in huge numbers due to their clean and economical energy conversion. Recent advancements in wind turbine technology and power electronic systems are also more instrumental for the brisk option of grid
Recently, wind electrical power systems are getting a lot of attention since they are cost competitive, environmentally clean, and safe renewable power source as compared with the fossil fuel and nuclear power generation. A special type of induction generator, called a doubly fed induction generator (DFIG), is used extensively for high-power wind applications. They are used more and more in wind turbine applications due to the ease of controllability, the high energy efficiency, and the improved power quality.This research aims to develop a method of a field orientation scheme for control both, the active and the reactive powers of a DFIG that are driven by a wind turbine. Also, the dynamic model of the DFIG, driven by a wind turbine during grid faults, is analyzed and developed, using the method of symmetrical components. Finally, this study proposes a novel fault ride-through (FRT) capability with a suitable control strategy (i.e. the ability of the power system to remain connected to the grid during faults). Auszug aus dem Text Text Sample: Chapter 2.1, Introduction: Electrical power is the most widely used source of energy for our homes, work places and industries. Population and industrial growth have led to significant increases in power consumption over the past three decades. Natural resources like coal, petroleum and gas which drive our power plants, industries and vehicles for many decades are becoming depleted at a very fast rate. This serious issue has motivated nations across the world to think about alternative forms of energy which utilize inexhaustible natural resources. Wind plants have benefited from steady advances in technology made over past 15 years. Much of the advancement has been made in the components dealing with grid integration, the electrical machine, power converters, and control capability. The days of the simple
Publisher: Hamburg : Diplomica Verlag, 2014
Edition: 1st ed
Copyright Date: ©2014
ISBN: 9783954896394
Branch Call Number: Electronic book
Characteristics: 1 online resource (117 pages)
Additional Contributors: ProQuest (Firm)


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