This paper is focused on the steadystate modeling of upfc for the. The unified power flow controller consists of two switching. A single phase of them system with the proposed topology consists of an n. Unified power flow controller ac power electric power system. Stability improvement in power systems using unified power. It has the combining features of both series converter.
This paper presents a comprehensive approach for the design of upfc controllers i. Power flow control and voltage profile improvement using. The focus of this thesis is a facts device known as the unified power flow controller upfc. Simulation study of the unified power flow controller upfc author. This paper deals with voltage sag compensation of 30 bus system using upfc. Unified power flow control the direct power is valuable control technique. This paper proposes a new unified power flow controller upfc topology. Contentsfacts devicesbenefits of facts devicestypes of facts devicesintroduction to upfccircuit descriptioncontrol schemesconclusion 3. Among different kinds of facts devices the upfc is the most versatile and effective device which was introduced in 1991. Implementation of unified power flow controller upfc for. Statcom is called upfc unified power flow controller. Scribd is the worlds largest social reading and publishing site. Unified power flow controller upfc advanced solutions in. A unified power flow controller upfc is a typical facts device capable of instantaneous control of three power system parameters.
Unified power flow controller upfc wileyieee press books. Power ow control with upfc rusejla sadikovic internal report 1 uni ed power flow controller upfc the upfc can provide simultaneous control of all basic power system parameters transmission voltage, impedance and phase angle. This paper discusses the designing of advanced control techniques for the operation of upfc. Unified power flow controller models for threephase power. Usually the main purpose of facts transmission system limits. Electrical energy is part and parcel of every individuals life. The upfc is the shunt series equipment interconnected by dc link, with shunt converter and series converter. The upfc consist of voltage source converters, one connected in series and other in shunt and both are connected back to back through a d.
This paper discusses the designing of advanced control. Improving the transient and dynamic stability of the network. Modelling and controlling of unified power flow controller upfc. Unified power flow control in facts in hindi duration. Unified power flow control in facts in hindi youtube. In this study, unified power flow controller upfc is designed and simulated by transformation theory. Pdf single phase unified power flow controller upfc. Dynamic control modes of the unified power flow controller upfc xia jiang transmission planning new york power authority april 23, 2008 this research is supported in part by nsf under grant ecs0300025, and in part by epri and nypa. This controller offers advantages in terms of static and dynamic operation of the power system. Tech power system school of engineering gautam buddha university, gr. A new and comprehensive load flow model for the unified power flow controller upfc is presented.
The unified power flow controller upfc is a power electronic controller which can be used to control active and reactive power flows in a transmission line by injection of variable voltage in series and reactive current in shunt. The upfc model is incorporated into an existing facts newtonraphson load flow algorithm. Unified power flow controller upfc is an advanced member of the group of flexible ac transmission systems facts. It can be set to control active and reactive powers and voltage. Manoz kumar reddy associate professor, electrical and electronics department, sri aditya engineering college, india abstract the capability of increasing transient and dynamic stability of the power system network by unified power flow controller upfc is the main focus in this paper. The upfc uses a combination of a shunt controller statcom and a series controller sssc interconnected through a common dc bus as shown on the figure below.
It summarizes all the most uptodate research and practical achievements that are related to upfc and mmc technology. The unified power flow controller upfc is one of the most widely used facts controllers and its main function is to control the voltage, phase angle and impedance of the power system thereby modulating the line reactance and controlling 2 the power flow in the transmission line the basic components of the upfc. The unified power flow controller upfc is a pair of back to back power electronic inverters which control the real and. This paper proposes a completely transformerless upfc based on an innovative configuration of two cascade multilevel inverters cmis. Abstractthe unified power flow controller upfc is the most versatile and complex power electronic facts device that has emerged for the control and optimization of power flow in electrical power transmission system. Unified power flow controller based on autotransformer. Unified power flow controller upfc is the most versatile and complex flexible ac transmission systems facts equipment that has emerged for the control and optimization of power flow in power transmission systems.
The example described in this section illustrates application of simscape electrical specialized power systems software to study the steadystate and dynamic performance of a unified power flow controller upfc used to relieve power congestion in a transmission system. The direct flow control can be used with any topology of voltage source converter. Unified power flow controller mihir rathod assistant professor ldrp itr engineering college, gandhinagar abstract the unified power flow controller upfc is a power electronic controller which can be used to control active and reactive power flows in a transmission line by injection of variable voltage in series and reactive current in. Modelling and controlling of unified power flow controller.
Upfc is able to control both transmitted real and reactive power. Unified power flow controller free download as powerpoint presentation. Upfc controllers have been designed in the presence of conventional pss. Unified power flow controller the introduction of upfc in power system improves the stability and it is one of the crucial factors for effective modern power systems. Unified power flow controller along with stabilization chitrasen gabel, dr. The unified power flow controller upfc is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system. Mahendra pratap singh gurjar, girish dalal subject. We study the simulation model of upfc and its output. The model consists of a simple voltage source whose magnitude and angle depend on the upfc control parameters.
The unified power flow controller upfc is the most versatile member of the flexible ac transmission systems facts family using power electronics to control power flow on power grids 1. Control power flow using upfc and pst introduction. Transformerless unified power flow controller for wind and solar power transmission presenters. May 12, 2019 unified power flow controller upfc is recognized as the most powerful flexible ac transmission systems facts device for power system. The objective of this paper is to use upfc injection model which can be incorporated in power flow algorithm for power flow control in a powernetwork. Pdf power flow control by unified power flow controller. Unified power flow controller upfc is recognized as the most powerful flexible ac transmission systems facts device for power system. We also study about the buckboost converter simulink model and its output. Pdf control of a unified power flow controller upfc. Unified power flow controller upfc is a versatile facts device which can independently or simultaneously control the active power, the reactive power, and the bus. The energy storing capacity of the dc capacitor is generally small, and so the shunt converter has to draw drain or generate active power from the grid in exactly the.
A versatile mathematical model of a unified power flow controller upfc in a single machine infinite bus system is proposed. Department of electrical engineering, bapatla engineering college, bapatla, india. Citeseerx the unified power flow controller upfc is a. Dynamic control modes of the unified power flow controller. A threephase system can be implemented with three devices.
Unified power flow controller upfc advanced solutions. Application of unified power flow controller upfc for. Critical comparisons are made against existing upfc models, which show the newly developed model to be far more flexible and efficient. We study the controller design of unified power flow controller design. This paper describes the theory and the modeling technique of a flexible alternating current transmission systems facts device, namely, unified power flow controller upfc using an electromagnetic transients program emtp simulation package. Transformerless unified power flow controller for wind and. Obtained results showed an improvement in the voltage magnitude of bus 9 and bus from 0. Transformerless unified power flow controller for wind. This paper deals with the designing of adaptive neuro fuzzy inference controller anfic and fuzzy based particle swarm optimization pso controller for the. This paper presents the modelling and implementation of a unified power flow controller upfc. Unified power flow controller technology and application.
In this paper, unified power flow controller upfc is applied to enhance the power transfer capability of transmission line. Enhancement of power transfer capability by using igbt. Hence the paper covers application of the power transfer and control capability of facts devices for. This paper concentrates on upfc for damping the oscillations. In this paper, three models of the unified power flow controller upfc suitable for threephase power flow analysis in polar coordinates are presented. While the conventional upfc topology uses two threephase. Improving the transient and dynamic stability of the.
Voltage stability enhancement and efficiency improvement of. The unified power flow controller optimal power flow model satakshi singh department of electrical engineering, jabalpur engineering college abstract this paper discusses the unified power flow controller upfc a member of the facts family. The symmetrical components control model can be used to control the positivesequence voltage of the shunt bus and the total threephase active and reactive power flows of the transmission line while the injected shunt voltages and the. In upfc, the transmitted power can be controlled by changing three parameters namely transmission magnitude voltage, impedance and phase angle. Design and analysis of unified power flow controller in.
The upfc, in this paper, consists of two solidstate voltage source inverters which are connected through a common dc link capacitor. The interaction between the upfc controllers and pss. Simulation study of the unified power flow controller upfc. Mithu sarkar, submitted to the national institute of technology, rourkela deemed university for the. The unified power flow controller upfc provides a promising means to control power flow in modern power systems. The unified power flow controller upfc was proposed for realtime control and dynamic compensation of ac transmission sys tems, providing the necessary functional flexibility required to solve many of the problems facing the utility industy. Comparison of multiline power flow control using unified power flow controller upfc and interline power flow controller ipfc in power transmission systems. Essentially, the performance depends on proper control setting achievable through a power flow analysis program. A unified power flow controller upfc is an electrical device for providing fastsensation on high.
Effective means for controlling and improving power flow is done by installing fast reacting devices such as upfc 4. The unified power flow controller upfc is a generalized ac transmission controller that has multiple functional capabilities and thus, it is capable of performing simultaneously or selectively the compensation and control functions of different individual line compensators and controllers. Therefore it is chosen as the focus of investigation. Among all facts devices the upfc most popular controller due to its wide area control over power both active and reactive, it also gives the system to be used for its maximum thermal limit. For the last few years, the focus of research in the. Power flow control and voltage profile improvement using unified power flow controller upfc in a grid network. Several facts devices like sssc, statcom, tcsc, upfc, svc etc. The unified power flow controller upfc is a more complete transmission line compensator 42, shown as a simplified block diagram in fig. Unified power flow controller upfc is the most promising version of facts devices as it serves to control simultaneously all three parameters voltage, impedance and phase angle at the same time. The application of the upfc in power system scientific.
Voltage stability enhancement and efficiency improvement. Fuzzy based unified power flow controller to control reactive. This device can be understood as a statcom and an sssc with a common dc link. Control setting of unified power flow controller through load. The unified power flow controller optimal power flow model. Citeseerx document details isaac councill, lee giles, pradeep teregowda. A unified power flow controller upfc is used to control the power flow in a 500 kv transmission system. Transient analysis of a unified power flow controller and its application to design of the dclink capacitor. This is to certify that the thesis entitled load flow studies with upfc power injection model by mr. Modeling and analysis of unified power flow controller upfc. Cascade multilevel inverter based unified power flow. This paper presents a useful tool for power utilities engineers to evaluate the application of.
The unified power flow controller upfc concept was proposed by gyugyi in the late 1980s, the electric power research institute epri formulated the flexible ac transmission voltage and power flow and reduces dynamic disturbances. Pdf comparison of multiline power flow control using. The upfc provides a full dynamic control of transmission parameters, voltage, line impedance and phase angle. To eliminate active power flow to cmis and maintain dc voltage. The voltagesource model of upfc can easily be incorporated into the generator output power equation and that simplifies the dynamic analysis of the system. Versatile model of a unified power flow controller in a.
The upfc located at the left end of the 75km line l2, between the 500 kv buses b1 and b2, is used to control the active and reactive powers flowing through bus b2. Evaluating the performance of unified power flow controller. Unified power flow controller upfc is the most promising version of facts devices as it serves to control simultaneously all three parameters voltage. Unified power flow controller upfc unified power flow controller upfc is a series. Unified power flow controller phasor type mathworks. Unified power flow controller ac power electric power. Ieee p2745 unified power flow controller working group report. This paper presents a basic control system which enables the upfc to follow the changes in reference values of the active and reactive power supplied from the outer system controller. Jan 17, 2017 unified power flow control in facts in hindi duration.
Basic control of unified power flow controller ieee. The problem investigated in this work is the application of the unified power flow controller upfc to enhance the protection of the nigerian 330kv power system by effectively limiting destructive fault current. For the love of physics walter lewin may 16, 2011 duration. Dynamic control modes of the unified power flow controller upfc. Unified power flow controller upfc, as a representative of the third generation of facts devices, is by far the most comprehensive facts device, in power system steadystate it can implement power flow regulation, reasonably controlling line active power and reactive power, improving the transmission capacity of power system, and in power. Unified power flow controller technology and application provides comprehensive coverage on upfc technology, providing a range of topics, including design principle, control and protection, and insulation coordination. This paper aims to present a reliable method to meet the requirements. Unified power flow controller upfc is an advanced and versatile device of flexible ac transmission systems facts, to control the real and reactive power flow, and to enhance the system stability in the transmission line. The upfc located at the left end of the 75km line l2, between the 500 kv buses b1 and b2, is used to control the active and reactive powers flowing through bus b2 while controlling voltage at bus b1. The controller can ful ll functions of reactive shunt compensation, series compensation and.
Flexible ac transmission system facts is a system composed of static equipments used for ac transmission of electric energy to improve the power transfer capability and to enhance controllability of interconnected network. Unified power flow controller an overview sciencedirect. Upfc is a combination of series and shunt voltage source converter vsc and both the converters are coupled to each other through a dc link. It has the combining features of both series converter and shunt converter based facts devices, and is capable of. Unified power flow controller upfc is the most widely used facts device for providing fast acting reactive power compensation on high voltage electricity transmission network. The unified power flow controller upfc is a novel power transmission controller. Out of these, upfc is the most flexible multi functional facts device. This paper presents real and reactive power flow control through a transmission line. The unified power flow controller upfc is one of the most widely used facts controllers and its main function is to control the voltage, phase angle and impedance of the power system thereby modulating the line reactance and controlling 2 the power flow in the transmission line the basic components of.
664 1489 892 1529 1151 214 454 1620 76 234 1106 887 964 303 735 838 421 850 1065 1104 421 1576 433 981 1400 735 595 892 1454 146 1260 1247 543 1486 360