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Grid-connected doubly-fed induction generators suffer from limited fault ride-through capability during grid faults and disturbances. This paper proposes a control and energy management scheme for a DFIG-based wind energy conversion system with a converter-free battery energy storage that improves the quality of power delivered to the utility grid during normal operating conditions and enhances the...
The penetration level of decentralized power generation plants based on renewable energy sources are continuously increasing with wind energy having a significant share. Considering present developments towards a purely renewable energy based electricity supply, Wind Energy Conversion Systems (WECS) play an important role in securing a stable, reliable and continuous supply of energy. Particularly...
Phase change materials can be used in various applications where thermal energy storage is needed, especially in renewable energy applications involving solar thermal and geothermal power Accurate modelling of these materials is needed for improved system design and optimization. Based on literature, two mathematical models are developed in this study, describing the one-dimensional transient heat...
Strengthening the role of renewable energy sources for the supply of electric energy, wind energy is gaining increasing importance. The doubly-fed induction generator as preferred generator type combines several advantages of low cost, high efficiency and variable speed in a wide range. However, an appropriate control for its complex structure is essential for an efficient performance. Therefore,...
Wide deployment of renewable energy sources and decentralized power generation increases the need for improved power quality and advanced performance of renewable generating units under normal and abnormal conditions. The latest Grid Codes expect generators to remain connected during symmetrical and asymmetrical grid faults and to contribute to the system recovery. Asymmetrical voltage conditions...
Renewable energy sources have long since been recognized as environmental-friendly, sustainable and climate-neutral solution for future power systems. With the increasing penetration of renewable energy sources, particularly wind energy, as well as the growing percentage of power electronics-based devices and plants in the electrical supply grid, power quality issues ranging from voltage sags/swells,...
This paper investigates a drive system control strategy for grid-connected wind energy conversion systems with doubly-fed induction generator and its behavior under grid fault operation. During grid faults there is a possibility for undefined load situations in the mechanical drive system. These loads are able to start oscillations in the drive system not only in the shaft but in the blades as well...
In the last two decades doubly-fed induction generators have found a wide utilization in wind energy conversion systems. Although this type of generator has a flexible operation and a good cost-performance ratio it is particularly sensitive to grid voltage disturbances and voltage harmonics. This paper first presents typical power quality phenomena found in weak electrical power systems in which wind...
The increasing share of renewable energy sources in the electricity grid presents a challenge for industrial plants which require the provision of a high power quality for operation. This paper presents the trends of major renewable energy sources and analyses the main occurrences of the associated energy conversion systems. Related power quality phenomena due to the stochastically fluctuating primary...
This paper investigates a drive system control strategy for grid-connected wind energy conversion systems with doubly-fed induction generator and its behavior under grid fault operation. During grid faults there is a possibility for undefined load situations in the mechanical drive system. These loads are able to start oscillations in the drive system not only in the shaft but in the blades as well...
Recent developments show that renewable energy sources are considerably contributing to the electrical power generation and offer a future-oriented, sustainable and environmental-friendly alternative to fossil energy sources. Wind energy in particular has experienced a rapid growth over the past decades, so that wind energy conversion systems (WECS) will occupy an important role in the power generation...
This paper investigates a control strategy for grid-connected wind energy conversion systems with doubly-fed induction generators, that employs a novel d-q hysteresis current regulator in the inner control loops. Although the current control is implemented in a rotating reference frame synchronous to the positive sequence space vector of the grid voltage, it can be used to generate negative sequence...
With the uptake of wind power increasing steadily on a global level, the grid compatibility of wind energy conversion systems (WECS) must be improved to ensure that electrical networks with a high wind penetration remain stable and reliable. For this reason WECS must now be able to remain connected to the grid during balanced and unbalanced grid faults and to provide ancillary services such as reactive...
Asymmetrical voltage conditions in the grid can have significant negative effects on the performance of wind energy conversion systems (WECS) equipped with doubly-fed induction generators (DFIG). Transient peaks as well as steady-state second-order and higher frequency harmonics are introduced in the active and reactive output powers, in the DC-link voltage and in the toque produced by the WECS. These...
As the penetration of wind power and other distributed generation sources increases, more demanding grid code requirements are introduced by the network operators in order to ensure the stability of the evolving electrical networks. The most challenging requirement for wind energy converter systems is the low voltage ride through capability that expects generators to remain connected during symmetrical...
The ongoing energy transition from conventional to renewable energy sources increases the demand for qualified personnel in the field of alternative power generation. Especially wind energy plays an increasingly important role in today's power industry as more electricity is generated by wind on a global scale. The complex and multidisciplinary nature of wind energy conversion systems (WECS) makes...
The significant growth of Distributed Generation Systems and their integration into electrical grids have tightened the requirements imposed by the Transmission System Operators, especially regarding the regulation of power and the behavior of the power converter during grid faults. In order to fulfil such requirements, such as Lowvoltage Ride-through and support the recovery of the grid voltage among...
The performance of grid-connected wind energy conversion systems with doubly-fed induction generators can be severely affected by grid events and low power quality, as the stator of the generator is directly connected to the grid. This paper presents power quality phenomena commonly encountered in the electrical grid and analyses their effect on the performance of DFIG-based wind energy conversion...
Wind energy plays an increasingly important role in today's power industry as more electricity is generated by wind on a global scale. The complex and multidisciplinary nature of wind energy conversion systems makes the understanding of this topic a challenging task. A novel web-based learning module on wind energy conversion and control that utilizes easy-to use interactive virtual experiments is...
The ongoing energy transition from conventional to renewable energy sources increases the demand for qualified personnel in the field of alternative power generation. Especially wind energy plays an increasingly important role in today's power industry as more electricity is generated by wind on a global scale. The complex and multidisciplinary nature of wind energy conversion systems makes the understanding...
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