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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...
With the steady transition towards a more dominant decentralized power generation and the further reduction of conventional fossil fuel-based power plants, future utility grids require higher demands regarding voltage quality and supply reliability. Active power filters with energy storage capability, here referred to as Power Conditioning Systems (PCS), offer grid supporting and stabilizing measures...
The importance of mitigating Power Quality (PQ) disturbances by utilizing Active Power Filter (APF) has long since been recognized and extensive research on this field has been conducted resulting in a great diversity of solutions. Facing current ambitions e.g. in raising the share of power generation based on renewable energy sources will pose new challenges in maintaining system stability evoked...
The detection of the fundamental frequency and phase angle of the positive sequence grid voltages are utmost necessary for the proper operation of controlled active power converters, which require to operate stable and robust even during the presence of diverse power quality issues. There exist various utility grid synchronization and detection methods based on Phased-Locked Loop (PLL) techniques...
Particularly regarding the continuous development towards power systems with high penetration level of decentralized power generation units based on renewable energy sources, active power filters with energy storage capabilities are applied to perform grid supporting and stabilizing measures. Such devices, which are here referred to as power or grid conditioning systems, require appropriate control...
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...
Low power quality and supply reliability within industrial grids cause severe economic damage to Europe's key industry sectors. A modular shunt connected power conditioning systems with the objective of locally improving quality of supply within industrial grids has been proposed. One of its voltage-fed power converter based modules implements functionalities which are comparable to those of well...
The deterioration of power quality is posing an increasing problem for low and medium voltage grids. At the same time, grid codes place ever stricter requirements for the operation of distributed generation systems, especially regarding fault-ride-through capabilities during more severe grid fault events. Therefore, a proper operation of converter-based power systems needs to be guaranteed, requiring...
The growing number of renewable energy sources and power electronic participants are increasingly endangering the quality of supply at distribution grid level. A modular shunt-connected power conditioning system featuring uninterruptible power supply capability is proposed to locally increase power quality and supply reliability. This paper proposes an operation-mode-adaptive cascaded control strategy...
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,...
Power quality issues in industrial grids such as voltage sags, swells and short interruptions have an economic impact and are therefore a challenge to the industry. Further on the grid infrastructure gradually experience a change to more decentralized power supply due to the further increasing penetration of renewable energies especially in middle- and low-voltage grids. With the objective to increase...
The increasing penetration of intermittent power generation from renewable energy sources as well as the growing number of non-linear power converters in the electricity grid pose a challenge for securing power quality. In this paper, a control system for a modular, shunt-type Power Conditioning System (PCS) is presented to particularly address voltage and current harmonics and reactive power compensation...
Power quality issues such as voltage sags/swells, interruptions and harmonics are of increasing concern. In the course of the energy transition the efforts to increase the share of renewable energies in the electricity grid lead to a more and more decentralized power generation impaired by stochastic and non-predictable fluctuations, while at the same time a growth in percentage of electrical loads...
The mitigation of power quality issues by means of customized power conditioning systems are of growing interest in recent years. The electricity supply is exposed to more frequent power quality problems, especially due to the steadily increasing integration of decentralized power generation, penetration of renewable energy, and deployment of non-linear converter-based loads. Active power filters...
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...
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