Improvement of power flow and voltage stability using. Power system stability improvement using facts devices. A upfc is used to control the power flow in a 500 kv 230 kv transmission systems. Power flow control in a transmission line using unified power. Flexible ac transmission system facts makes use of the thyristor controlled devices and optimally utilizes the existing. Since it is a solid state controller which can be used to control active and reactive power flow in a transmission line. Inclusion of the real power coordination controller in the. In this paper the performance of unified power flow controller is investigated in controlling the flow of po wer over the transmission line.
Its special features are to control active and reactive power course in a transmission line and to adjust the voltage at the bus at which it is situated. This paper presents simulation of power losses improvement with unified power flow controller upfc on transmission line system of southern and western sulawesi sulselbar using neplan software. Pdf improving the electric power quality by upfc systems in. Hence, the multistage control method for the upfc to improve the systems transient stability can be expressed as follows.
These two devices connected each other by common dc link capacitor. It is the basic analysis tool for the planning, design and operation of any electrical power system. 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 below7. By providing dynamic reactive power, svc can be used for the purpose of regulating the system voltage, compensating the voltage at reasonable level, improving the capacity of the transmission line. Power quality improvement in power system using upfc. Voltage source model was utilized to study the behaviour of the. This paper concentrates on fact device upfc which is used for powerflow control in the transmission side.
Pdf unified power flow controller upfc is used to control the power flow in the transmission systems by. Design and analysis of unified power flow controller in. This research deals with digital simulation of standard ieee 14bus power system using upfc to improve the real and reactive power flow control through a transmission line by placing upfc at the sending end using computer simulation. Power flow control an overview sciencedirect topics. The basic control for the upfc is such that the series converter of the upfc controls the transmission line realreactive power flow and the shunt converter of the upfc controls the upfc bus voltageshunt reactive power and. Upfc to improve the power flow in the transmission line.
Transmission capability of the existing transmission line is highly improved with the presence of upfc. A unified power flow controller upfc is used to control the power flow in a 500 kv transmission system. Improvement of power transfer capability and power system. The upfc performance was investigated in controlling the flow of power over the transmission lines.
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. Simulation results using emtdc demonstrate that upfc can improve the voltage and power flow of the system rapidly and effectively when all the operating limit conditions are satisfied. Transient stability improvement in power system using unified. Upfc is the most far reaching multivariable adaptable air conditioning transmission framework facts controller. Cyme power engineering software and solutions power flow. Improving of transient stability of power systems by. With the information age in full swing, the growth of high reliability, low cost electronic products have led utilities to. Therefore, this paper presents thyristor based upfc controllers to improve the performance of multiii. A tcsc is a series controlled capacitive reactance that can provide continuous control.
Control concept of upfc the unified power flow controller upfc is the most versatile member of the flexible ac transmission. Improvement of power flow in the power system network by using. Power flow improvement in transmission line using upfc. This paper presents control and performance of upfc intended for. The 230 kv transmission line carries 100 mw of power. Archived from the original pdf on unified power flow controller upfcas 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 system transient. This research regarding the 6bus power system to control the active. Pdf single phase unified power flow controller upfc. Pdf power flow control with upfc in power transmission. Power flow optimization using upfc based on neurofuzzy. It has a capability of improving both steadystate and dynamic. This paper discusses the designing of advanced control techniques for the operation of upfc.
The system consists of 2 generators, 2 transformers and buses. Transient stability improvement of smib with unified power. Jul 06, 20 unified power flow controller upfc is the most versatile facts device for optimization and control of power flow in transmission system. Power quality improvement in dfig based wind energy. Voltage stability enhancement and efficiency improvement. The motive of research published in this paper is to propose a methodology to solve optimal reactive power dispatch problem using two phase hybrid combination of genetic algorithm and particle swarm optimization algorithms.
The shunt inverter is used for voltage regulationat the point of connection injecting an opportunereactive power flow into the line and to balancethe real power flow exchanged between theseries inverter and the transmission line. A unified power flow controller upfc is an electrical device for providing fastacting reactive power compensation on highvoltage electricity transmission networks. In the operating system, power losses on transmission line can be improved reduced to increase the generation capacity by controlling the. Shunt converter and series converter of a upfc can provide shunt compensation and serial compensation for a power system respectively to maintain the bus voltage and modulate power flow of the transmission line. This controller offers advantages in terms of static and dynamic operation of the power system. This research deals with simulation of 6bus power system using upfc to improve the power transfer capability through a transmission line by placing upfc at the sending end using computer simulation. State controllers, which provide functional flexibility. This combines the fuzzy qualitative approach with the adaptive capabilities of neural networks to achieve improved performance. The steadystate power flow in the 345 kv transmission line is 400 mw.
Read the input of the system data that includes the data needed for conventional power flow calculation, i. The unique capabilities of the upfc in multiple line compensation are integrated into a generalized power flow controller that is able to maintain prescribed, and. The basic control for the upfc is such that the series converter of the upfc controls the transmission line realreactive power flow and the shunt converter of the upfc controls the upfc bus voltageshunt reactive power and the dc link capacitor voltage. Power factor improvement using upfc electric power system.
The unified power flow controller optimal power flow model. This paper presents real and reactive power flow control through a transmission line by placing upfc at the sending end using computer simulation. Traditional solutions to upgrading the electrical trans. The basic concept in designing of any power lines in transmission of ac dc power with power upgrading using upfc is proposed through a single circuit ac. In the event of large disturbances, sudden faults, opening or closing of circuit breaker, load changes etc or internal mechanical torques affects the power system stability of the system. It uses a pair of threephase controllable bridges to produce current that is injected into a transmission line using a series transformer. Pdf power flow control using upfc device researchgate. This project propose the real, reactive powe r and voltage control through a. The upfc is located at the center of a 160km 345kv line. 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. Voltage stability enhancement and efficiency improvement of. Improvement of power system stability by using upfc with. The unified power flow controller upfc is a typical facts flexible ac transmission systems device t hat is the most sophisticated and complex power electronic equipment and has emerged for the control and optimization of power flow and also to regulate the voltage in electrical power transmission system.
Improvement of power system transient stability using tcsc. Power quality improvement by using svpwm based upfc. Dr ahmed massoud university of strathclyde 25 c s a s b s c s a s b s c v an. Performance improvement of electrical power system using upfc. 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 dynamic nature of the upfc lies in the use of thyristor devices e.
Upfc in power flow control in the transmission line. Tech, 2associate professor, 12dept of eee, brilliant institute of engineering and technology, ranga reddy, india. This paper proposes a brand new real and reactive power coordination controller for a unified power flow controller. This paper proposes a new real and reactive power coordination controller for a unified power flow controller. Pdf power flow control in a transmission line using. The series converter of the upfc injects a series voltage of adjustable magnitude and phase angle in the transmission line and controls real and reactive power flow. Generation, transmission, distribution in any power system, the creation, transmission, and utilization of electrical power can be separated into three areas, which traditionally determined the way in which electric utility companies had been organized. In the simulation study, the upfc facilitates the real time control and dynamic compensation of ac transmission system 45. Pdf power flow control through transmission line with upfc. The shunt converter of the upfc controls the dc link capacitor voltage. This paper shows that the unified power flow controller upfc is able to control both the transmitted real power and, independently, the reactive power flows at the sending and the receivingend of the transmission line. The significance of power factor correction pfc has long been visualized as a technology requirement for improving the efficiency of a power system network by compensating for the fundamental reactive power generated or consumed by simple inductive or capacitive loads. Improvement of orpd algorithm for transmission loss.
Pdf power flow control through transmission line with. Implementing power flow in a transmission line through unified power flow controller upfc silas rondla1,p. 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 the power flow in the transmission line. Pdf upfc based wind systems for improvement of power. Power flow improvement in transmission line using upfc 1jalla pavan sai kumar reddy, 2prasad janga 1,2dept. In this paper we are discussing about a facts device named as upfc unified power flow controller.
The series inverter can be used to control thereal and reactive line power flow inserting anopportune voltage with controllable magnitudeand phase in series with the transmission line. Voltage stability improvement using upfc the power systems operation becomes more important as the load demand increases all over the world. This paper investigates the enhancement in voltage stability margin as well as the improvement in the power transfer capability in a power system with the incorporation of upfc. Power flow control and voltage profile improvement using. Capacitor less upfc for power quality improvement using. Using flexible ac transmission system facts, it is possible to control the transmitted power through transmission lines and improve transient stability of the. It is assumed that vseq follows vseq ref without any time delay. The upfc bus voltageshunt reactive power and the dc link capacitor voltage is controlled by the shunt converter of the upfc. Implementation of unified power flow controller upfc for. This device can be understood as a statcom and an sssc with a common dc link.
Power factor improvement using upfc linkedin slideshare. A simple transmission line system is modeled in mat labsimulink environment. Response of the power system to threephase fault with upfc. The shunt inverter is used to voltage regulation at the point of connection, introduce reactive power flow into the line and to balance the active power flow returned between the series inverter on the transmission line. Stability improvement of power system by using psc.
This paper investigates the improvement of transient stability of a twoarea power system, using upfc unified power flow controller which is an effective facts flexible ac transmission system. In the operation of electric power system, the power flow on the transmission line is a function of the. But the difference between the sendingend real power and receiving end real power is high in the transmission line with upfc. Power quality improvement using upfc research trend. Unified power flow controller for power quality improvement. 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. In normal operation, the upfc is working in line power flow control mode to optimize the power flow. Improvement of power system transient stability using tcsc, sssc and upfc 1 introduction. Optimal power flow control on power system transmission. It is also shown that a upfc can control independently the real and reactive power flow in a transmission line. The transmission losses are more dependent upon the voltages at various load conditions. Systems facts family using power electronics to control power flow on power grids7. Obtained results showed an improvement in the voltage magnitude of bus 9 and bus from 0.
Power flow control in transmission line using upfc device international journal of advanced technology and innovative research volume. The series inverter can be used to control thereal and reactive line power flow inserting anopportune voltage with. This paper proposes another genuine and receptive power coordination controller for a brought together power stream controller the. Pdf power flow control by unified power flow controller. The project explains the control and performance of upfc intended for installation on the transmission line to control power flow. Indian journal of science and technology, power quality. Simulation of power losses improvement with unified power. Voltage sources model is utilized to study the behaviour of the upfc in regulating the active, reactive power and voltage profile. The real power p pq is assumed to be transferred to the sending end generator.
Power flow improvement in transmission line with reduced. 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. Keywords ac transmission, facts, power flow controller, line compensation. Power system stability control is an important aspect. Power flow improvement in transmission line using upfc iject. This gives information about the upfc based control scheme to mitigate the power quality utility in transmission line bus with linear load. Navneet kaur gagan deep yadav power quality improvement in power system using upfc published in international journal of trend in scientific research and development ijtsrd, issn. This research deals with digital simulation of standard ieee 14bus power system using upfc to improve the real and reactive power flow control through a transmission line by placing upfc at the sending end using computer. This paper presents improvement of power losses on transmission lines using unified power flow controller upfc for street lighting requirement. Power quality improvement in dfig based wind energy conversion system using upfc.
It is a voltage source converter based facts controller for series and shunt compensation of the line which controls the real and reactive power independently. Power flow improvement in transmission line with reduced dc. Power flow analysis of long transmission line using svc. Two machine system with the unified power flow controller. Unified power flow controller upfc is used to control the power flow in the transmission systems by controlling the impedance, voltage magnitude and phase angle. Among the facts components, unified power flow controller upfc 2 and interline power flow controller ipfc 3 are the most advanced in facts controllers. In the upfc circuit structure, the dc link between the two inverters establishes a bidirectional coupling for real power flow between the injected series voltage source and the sending end bus. 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. Cyme power engineering software and solutions execute power flow analysis on threephase electric power networks the objective of a power flow program is to analyze the steadystate performance of the power system under various operating conditions. Experimental verification and matlab simulation of upfc for. Improvement of power flow and voltage stability using unified power flow controller abstract. This model is incorporated in newton raphson algorithm for load flow studies.
Greg mowry annie sebastian marian mohamed school of engineering soe university of st thomas ust 1. Power flow controller upfc and inter interline power flow controllers ipfc belong to the group1,2. Facts technologies allow for improved transmission system operation with minimal infrastructure investment, environmental impact, and transmission lines. Optimal reactive power dispatch tackles network loss reduction, increased power. Power flow improvement in transmission line using upfc international journal of advanced technology and innovative research volume. The unified power flow controller upfc is a more complete transmission line compensator 42, shown as a simplified block diagram in fig. Tcsc, the first generation of facts, can control the line impedance through the introduction of a thyristor controlled capacitor in series with the transmission line. Control power flow using upfc and pst introduction.
With the growing demand of electricity, it is not possible to erect new lines to face the situation. Improvement of power losses on transmission line using. In this paper the working of upfc is in the field of control flow of power in transmissionline. It is necessary to distinguish between the roles of the upfc as a power flow controller in order to achieve. Power flow and voltage stability improvement using upfc. In summary, facts devices are used to achieve the following major goals. When no upfc is installed, real and reactive power through the transmission line can not be controlled. The upfc is bypassed and blocked during a fault occurrence to protect the upfc equipment. Stability improvement of power system by using psc controlled. It can be present real and reactive power flow control through a transmission line by place unified power flow controller is studied to improve the power flow over a transmission line in a standard ieee 14 bus system. So this device gives unique control on the power flow. But unified power flow controller upfc is such a versatile facts device that has the capability of controlling all the three parameters simultaneously.
The method of improving voltage stability by using upfc is tested on multimachine system. The series converter of the upfc controls the real power flow in the transmission line. Power flow control in transmission line using upfc device. Upfc is investigated in controlling the flow of power over the transmission line. Improvement of power flow and voltage stability using unified power. In addition, it can perform the control function of the power transmission line realreactive power flow, upfc bus voltage and the shuntreactive power flow control 26. Abstract flexible ac transmission system facts devices uses power electronics components to. Jan 20, 20 the shunt inverter is used for voltage regulationat the point of connection injecting an opportunereactive power flow into the line and to balancethe real power flow exchanged between theseries inverter and the transmission line.
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