1,722,515 research outputs found
Investigating low voltage ride through capability on wind farm by using static synchronus compensator (STATCOM) application
Full text linkAs an alternative to traditional fossil fuel extracted energy, wind energy has been acknowledged as one of the most important sources of renewable energies in the world. This clean and natural source of energy could be a key to solving the worldwide energy crisis with low environmental impact.
The increased penetration of wind power into the power grids mean the impact of the wind turbines on the grid can no longer be ignored. Grid codes these days include the requirement that the wind turbines have to stay connected when the voltage drops. This is known as the Low Voltage Ride Through (LVRT) requirement. Tripping wind turbines during any fault event can have a major effect on the stability of the power system.
A voltage regulation device is needed for stability improvement and power quality improvement of the overall system. The voltage stability issue can be achieved by using Flexible AC Transmission System (FACTS) devices with the reactive power compensation required by the power grid. FACTS devices are widely used for enhancing power system performance, reducing overall power losses, increasing grid reliability and voltage stability.
This thesis investigates the use of Static Synchronous Compensator (STATCOM) on wind farms for the purpose of stabilizing the grid voltage after a disturbance. The study focuses on a fundamental grid operation requirement to maintain a voltage at the point of common coupling by regulating the voltage.
The simulations were carried out by using DIgSILENT PowerFactory software and attaching STATCOM model in the wind farm model. The results indicate that the STATCOM can provide an enhanced performance to the power grid. This is mainly achieved by generating or absorbing the reactive power to provide grid stability during the fault period. Result comparison was made with the previous results which were carried out by another student in 2010
Optimization Models for Operation of Power-to-X Technologies
No full textA climate-neutral energy system relies on an integrated approach to decarbonization across different sectors and end uses, such as electricity, heating, cooling, transport, and industry. Sector coupling represents the key for exploiting synergies coming from the interplay of different energy sources and carriers to enhance flexibility for the whole system and renewable energy integration and increase efficiency in the energy resources use, by also increasing the resilience of existing network infrastructures. Despite these evident benefits, sector coupling and power-to-X (PtX) technologies define new challenges for the energy system operation, being among others the interdependency among energy carriers and related technologies and processes that need to be properly modeled and optimized for an efficient operation, by serving different sustainability objectives. This chapter aims to present a comprehensive analytical framework for the operation optimization of sector coupling and PtX technologies in the context of multi-carrier energy system (MCES) by considering multiple objectives. The mathematical modeling considers all the layers of the dependency, including the system components and intersectoral aspects. The effectiveness of the proposed optimization models is demonstrated through two case studies with different degrees of complexity both in terms of energy carriers considered and end users involved
Development of a system for testing grid-connected permanent magnet wind generators
No full textRenewable energy will be included in the South African Energy Mix over the next two decades. The introduction of renewable energy will reduce South Africa's carbon emissions and also stimulate the economy through job creation as well as creating a local manufacturing sector. South Africa has a large coastal region which is ideal for wind energy deployment. The integration of wind power into the grid needs to be understood as well as the possible problems associated with it. The objective this thesis is to develop a laboratory-based system which can serve as a tool for studying non-ideal conditions associated with the integration of grid-connected Permanent Magnet (PM) wind generators
Stability and robustness improvement of power converters
No full textIn this chapter, the stability and robustness improvements of current-controlled voltage source converters (VSCs) are addressed. The dynamic impacts of control loops, including the inner current loop, the phase-locked loop, and the outer DC-link voltage control loop, on the stability robustness of VSCs are systematically discussed.</p
Active rectifiers and their control
No full textThis chapter investigates the control design of active rectifiers and their applications in power electronics-based power system. The harmonic emission and measures are firstly addressed as a basis of evaluating the active rectifier’s effectiveness. Furthermore, the importance of new coming standards is highlighted. Application-oriented design of active rectifiers as a main reason behind evolvement of different topologies is discussed. Then, the main principle in designing different control schemes in single-phase and three-phase rectifiers is investigated, analyzed, and experimentally verified. The influence of nonideal operating conditions with possible solutions is addressed. Finally, future prospective of active rectifiers as a one of the key enabler of carbon-free power system is summarized
Power sharing algorithm for vector controlled six-phase AC motor with four customary three-phase voltage source inverter drive
Full text linkThis paper considered a six-phase (asymmetrical) induction motor, kept 30° phase displacement between two set of three-phase open-end stator windings configuration. The drive system consists of four classical three-phase voltage inverters (VSIs) and all four dc sources are deliberately kept isolated. Therefore, zero-sequence/homopolar current components cannot flow. The original and effective power sharing algorithm is proposed in this paper with three variables (degree of freedom) based on synchronous field oriented control (FOC). A standard three-level space vector pulse width modulation (SVPWM) by nearest three vectors (NTVs) approach is adopted to regulate each couple of VSIs. The proposed power sharing algorithm is verified by complete numerical simulation modeling (Matlab/Simulink-PLECS software) of whole ac drive system by observing the dynamic behaviors in different designed condition. Set of results are provided in this paper, which confirms a good agreement with theoretical development
Global goals for a better and more sustainable world demanding electrification and power electronics
Full text linkEn este número de In Genium dedicado a los Objetivos de Desarrollo Sostenibles (ODS) definidos por la ONU, desde la Sección de Ing. Eléctrica, Electrónica e Informática, invitamos al Prof. Frede Blaabjerg, de la Universidad de Aalborg en Dinamarca, a escribir un artículo para la revista. El Prof. Blaabjerg ha trabajado por más de 30 años en temas de Electrónica de Potencia aplicada a sistemas de energía y accedió gentilmente a escribir un artículo especial para In-Genium.Academia de la Ingeniería de la provincia de Buenos Aire
Energy Saving and Efficient Energy Use By Power Electronic Systems
No full textIn the development of the modern society, one of the key factors is to save energy in order to become more independent of other energy resources. Two important approaches can be taken—one is to change behavior and thereby save energy—the second one is to develop new technology which is able to save energy in different applications. This chapter will give an overview of challenges and possibilities in terms of energy saving and also energy efficient use. This includes a discussion on high efficiency power electronics devices and the systems they are used for energy loss reduction. The key enabling technologies are power electronics, Information and Communication Technology (ICT) as well as systems to carry the electrical energy through power transmission, conversion and distribution. A couple of examples will be given to demonstrate the energy saving possibilities by power electronics systems, such as in the applications of adjustable speed drives and solid-state lighting systems. Power electronics gives also a high flexibility when renewable power production is introduced to electrical energy systems. Future research opportunities and challenges will finally be discussed
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