FLEXIBLE AC TRANSMISSION SYSTEM PDF
PDF | Development of power generation and transmission, in last ten years, has been In this environment, Flexible Alternating Current Transmission System. PDF | On Jan 1, , Xiao-Ping Zhang and others published Flexible AC Transmission System: Modelling and Control. extensions. The flexible alternating current transmission system (FACTS), a Flexible AC Transmission System (FACTS) is defined by an IEEE Working Group.
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Flexible AC Transmission System (FACTS) is an integrated concept based on power electronic switching converters and dynamic controllers to enhance the. Flexible Alternating Current. Transmission Systems (FACTS). FACTS. AC transmission systems incorporating the power electronic-based to enhance. Preface. FACTS or "flexible AC transmission systems" is a term that has been suggested for the use of solid state devices to control bulk power flow in.
It is generally a power electronics -based system. FACTS is defined by the IEEE as "a power electronic based system and other static equipment that provide control of one or more AC transmission system parameters to enhance controllability and increase power transfer capability". They improve transmission quality and efficiency of power transmission by supplying inductive or reactive power to the grid.
It works as a controllable current source. Shunt compensation is of two types:. In the case of a no-loss line, voltage magnitude at the receiving end is the same as voltage magnitude at the sending end: FACTS for series compensation modify line impedance: X is decreased so as to increase the transmittable active power.
Flexible AC Transmission System - FACT Practicals
However, more reactive power must be provided. Reactive current is injected into the line to maintain voltage magnitude. Transmittable active power is increased but more reactive power is to be provided.
From Wikipedia, the free encyclopedia. This article is about the transmission system. In the distribution area, an exciting opportunity called Custom Power enables at-the-fence solutions for delivery to industrial and commercial customers, valueadded reliable electric service which is free from significant voltage reductions distortions, and over-voltages. The Custom Power concept incorporates power electronics Controllers and switching equipment, one or more of which can be used to provide a value-added service to the customers.
In general, these Custom Power applications represent power electronics in the range of a few tens of kilowatts to a few tens of megawatts of conversion or switching equipment between the utility supply and the customer.
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HVDC, a well-established technology, is often an economical way to interconnect certain power systems, which are situated in different regions separated by long distances over 50 km submarine or km overhead line , or those which have different frequencies or incompatible frequency control. HVDC involves conversion of ac to de at one end and conversion of de to ac at the other end.
In general, HVDC represents conversion equipment sizes in the range of a hundred megawatts to a few thousand megawatts. In general, FACTS-the subject matter of this book and a relatively new technology-has the principal role to enhance controllability and power transfer capability in ac systems.
On the end-use side, power electronics conversion and switching technology has been a fast-growing area for over two decades for a wide range of needs. The fact is that electricity is an incredible form of energy, which can be converted to many different forms to bring about new and enabling technologies of high value.
Conversion to pulses and electromagnetic waves has given us computers and communications. Conversion to microwave has led to microwave ovens, industrial processes, and radar.
In arc form, electricity serves its high value in arc furnaces, welding, and so on. Efficient lighting, lasers, visuals, sound, robots, medical tools, and of course, variable speed drives and the expanding need for dc power supplies are among the many other examples. Complementing the Custom Power technology is the whole area of power conditioning technology used by customers, under the term Power Quality.
Uninterruptible power supplies UPS and voltage regulators represent a major growth area in power electronics. In end use, the converter sizes range from a few watts to tens of megawatts. Considering the opportunities in power electronics through reduction in cost, size and losses, we are in an early stage of the power electronic revolution, and there is a bright future ahead for those who are involved.
Potentially, there is a significant commonality and synergism between the different areas of applications in generation, Preface transmission, distribution, and end use.
FAcrs technology, being new, has a lot to borrow from the power electronics conversion, switching, and control ideas in other areas. Also there is considerable overlap in the megawatt size, and hence there is potential use of standard components and subassemblies among many applications noted above and new ones in the future.
Lifecycle service for FACTS Power Quality
Therefore, it is suggested that those individuals involved in power electronics not confine their interest to one narrow application area. In this book the term "FACTS Controller" or just "Controller" with capital C, is used to generally characterize the various power electronic circuit topologies or equipment that perform a certain function such as current control, power control, and so on.
Since the Power Semiconductor device is also referred to as a "device", the authors have chosen to use the term "Controller". The reason for using capital C is to distinguish Controllers from the controllers used for industrial controls. Besides, the word "device" sounds like a component, and the authors request the readers to use the word Controller for FACTS Controllers.
The authors' intent in writing this book on FACTS is to provide useful information for the application engineers rather than for a detailed post-graduate college course. Therefore, there is an emphasis on physical explanations of the principles involved, and not on the mathematically supported theory of the many design aspects of the equipment. Nevertheless, post-graduate students will also greatly benefit from this book before they launch into the theoretical aspect of their research.
This book will help post-graduate students acquire a broad understanding of the subject and a practical perspective enabling them to use their talents on real problems that need solutions.
The book does not go into the details of transmission design and system analysis, on which there are already several good published books. Engineers who wish to acquire sufficient knowledge to sort out various options, participate in equipment specifications, and become involved with detailed engineering and design will find significant value in reading the entire book in preparation for more lifelong learning in this area. Chapter 2: "Power Semiconductor Devices" is a complex subject, and the subject matter of many books.
In this book, sufficient material is provided for the FACTS application engineer for knowing those options. Those familiar with the subject of HVDC know that practically all the HYDC projects are based on use of thyristors with no gate tum-off capability, assembled into pulse converters, which can be controlled to function as a voltage-controlled rectifier ae to de or as inverter de to ac. The voltage can be controlled from maximum positive to maximum negative, with the current flowing in the same direction; that is, power flow reverses with reversal of voltage and unidirectional current.
Current-sourced converters based on thyristors with no gate turn-off capability only consume but cannot supply reactive power, whereas the voltage-sourced converters with gate turn-off thyristors can supply reactive power. Such converters are based on devices with gate turn-off capability. In such unidirectional-voltage converters, the power reversal involves reversal of Preface current and not the voltage.
The voltage-sourced converters are described in Chapter 3 and the current-sourced converters in Chapter 4. There are a wide variety of FACfS Controllers, and they have overlapping and competing attributes in enhancing the controllability and transfer capability of transmission. The best choice of a Controller for a given need is the function of the benefit-to-cost consideration. Chapter 8 describes the combined series and shunt controllers, which are in a way the ultimate controllers that can control the voltage, the active power flow, and the reactive power flow.
There already is a large volume of published literature. At the end of each chapter, authors have listed those references that represent the basis for the material in that chapter, as well as a few other references that are directly relevant to that chapter.
This support also was vital for Dr. Neal Balu, Ben Damsky, the late Dr. Gil Addis, Dr. Ram Adapa, Dr. Aty Edris, Dr. Harshad Mehta, and Dominic Maratukulam for competent management of many projects funded with various companies and universities.
Karl Stahlkopf, Mark Wilhelm, and Dr. Robert Schainker, with special thanks to Dr. Control of active and reactive power flow at both sending and receiving end. A portion of the real power flow on the transmission line is drawn from the bus by the shunt inverter to charge the DC capacitor.
Reactive power is generated or absorbed by the shunt inverter to control bus voltage. Real power is inserted into the line through the series inverter. Current Limitation by using reactor was done but it reduces system stability.
If the short-circuit current rating of the equipment in the system is exceeded. This new device operates with zero impedance in steady-state conditions and in case of a short circuit. Flag for inappropriate content. Related titles. Jump to Page. Search inside document.
Typical Power System. Power Flow Control MW. Susmita Panda. Aravind Babu. Priyanka Vedula. Sravan Gupta. Umang Soni. S Bharadwaj Reddy.An advantage of genetic algorithm techniques is that the parameter limits can be varied during the optimization, making the techniques computationally efficient. Baker, L. The best choice of a Controller for a given need is the function of the benefit-to-cost consideration. Priyanka Vedula.
What is the basic principle of TCSC? In end use, the converter sizes range from a few watts to tens of megawatts. A particular debt of gratitude is extended to John P. Chapter 8 describes the combined series and shunt controllers, which are in a way the ultimate controllers that can control the voltage, the active power flow, and the reactive power flow.
Without any control, power flow is based on the inverse of the various transmission line impedances.
Static Var Compensator SVC The static Var compensator regulates the voltage by controlling the amount of reactive power absorbed from or injected into the power system.