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. Flexible ac transmission system facts makes use of the thyristor controlled devices and optimally utilizes the existing. Implementing power flow in a transmission line through unified power flow controller upfc silas rondla1,p. Transmission capability of the existing transmission line is highly improved with the presence of upfc.
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. 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. A simple transmission line system is modeled in mat labsimulink environment. 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. The dynamic nature of the upfc lies in the use of thyristor devices e. Systems facts family using power electronics to control power flow on power grids7. Unified power flow controller for power quality improvement. These two devices connected each other by common dc link capacitor.
Pdf improving the electric power quality by upfc systems in. This paper proposes a brand new real and reactive power coordination controller for a unified power flow controller. Power flow improvement in transmission line with reduced dc. Power flow control in a transmission line using unified power. 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.
Improvement of power transfer capability and power system. Traditional solutions to upgrading the electrical trans. Voltage stability improvement using upfc the power systems operation becomes more important as the load demand increases all over the world. Hence, the multistage control method for the upfc to improve the systems transient stability can be expressed as follows. Improving of transient stability of power systems by. Power flow improvement in transmission line using upfc iject. 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. Control concept of upfc the unified power flow controller upfc is the most versatile member of the flexible ac transmission. Simulation of power losses improvement with unified power. 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. In this paper we are discussing about a facts device named as upfc unified power flow controller. This paper proposes a new real and reactive power coordination controller for a unified power flow controller. 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.
In the operating system, power losses on transmission line can be improved reduced to increase the generation capacity by controlling the. Dr ahmed massoud university of strathclyde 25 c s a s b s c s a s b s c v an. 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. Pdf unified power flow controller upfc is used to control the power flow in the transmission systems by. Indian journal of science and technology, power quality. Stability improvement of power system by using psc. Power flow improvement in transmission line using upfc international journal of advanced technology and innovative research volume.
It is also shown that a upfc can control independently the real and reactive power flow in a transmission line. 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. 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 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.
Power flow control in transmission line using upfc device international journal of advanced technology and innovative research volume. Power quality improvement in power system using upfc. Improvement of power losses on transmission line using. Improvement of power flow and voltage stability using. Since it is a solid state controller which can be used to control active and reactive power flow in a transmission line. 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. Power flow analysis of long transmission line using svc. Read the input of the system data that includes the data needed for conventional power flow calculation, i. In normal operation, the upfc is working in line power flow control mode to optimize the power flow.
Facts technologies allow for improved transmission system operation with minimal infrastructure investment, environmental impact, and transmission lines. 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. Obtained results showed an improvement in the voltage magnitude of bus 9 and bus from 0. 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. Voltage source model was utilized to study the behaviour of the.
Power flow improvement in transmission line with reduced. Pdf power flow control by unified power flow controller. In the simulation study, the upfc facilitates the real time control and dynamic compensation of ac transmission system 45. The system consists of 2 generators, 2 transformers and buses. Upfc to improve the power flow in the transmission line. Power flow improvement in transmission line using upfc 1jalla pavan sai kumar reddy, 2prasad janga 1,2dept. The shunt converter of the upfc controls the dc link capacitor voltage. Improvement of power system transient stability using tcsc. 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. Pdf power flow control in a transmission line using. The unified power flow controller upfc is a more complete transmission line compensator 42, shown as a simplified block diagram in fig.
Power quality improvement in dfig based wind energy conversion system using upfc. Transient stability improvement in power system using unified. Improvement of power system transient stability using tcsc, sssc and upfc 1 introduction. Power flow control an overview sciencedirect topics. 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. The project explains the control and performance of upfc intended for installation on the transmission line to control power flow. Power flow optimization using upfc based on neurofuzzy.
Greg mowry annie sebastian marian mohamed school of engineering soe university of st thomas ust 1. A upfc is used to control the power flow in a 500 kv 230 kv transmission systems. Improvement of orpd algorithm for transmission loss. 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. 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 transmission losses are more dependent upon the voltages at various load conditions. Jul 06, 20 unified power flow controller upfc is the most versatile facts device for optimization and control of power flow in transmission system. In the operation of electric power system, the power flow on the transmission line is a function of the. The upfc performance was investigated in controlling the flow of power over the transmission lines. It uses a pair of threephase controllable bridges to produce current that is injected into a transmission line using a series transformer. Power flow and voltage stability improvement using upfc. 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 unified power flow controller optimal power flow model. It is assumed that vseq follows vseq ref without any time delay. Power factor improvement using upfc linkedin slideshare. Inclusion of the real power coordination controller in the.
Power quality improvement by using svpwm based upfc. Two machine system with the unified power flow controller. The upfc bus voltageshunt reactive power and the dc link capacitor voltage is controlled by the shunt converter of the upfc. Upfc is the most far reaching multivariable adaptable air conditioning transmission framework facts controller. Among the facts components, unified power flow controller upfc 2 and interline power flow controller ipfc 3 are the most advanced in facts controllers. Voltage stability enhancement and efficiency improvement of. Response of the power system to threephase fault with upfc. 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. 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. This controller offers advantages in terms of static and dynamic operation of the power system.
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. 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. Voltage sources model is utilized to study the behaviour of the upfc in regulating the active, reactive power and voltage profile. This paper presents control and performance of upfc intended for. 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. 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. 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.
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. Experimental verification and matlab simulation of upfc for. This project propose the real, reactive powe r and voltage control through a. A tcsc is a series controlled capacitive reactance that can provide continuous control. 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. It has a capability of improving both steadystate and dynamic. Pdf upfc based wind systems for improvement of power. Upfc in power flow control in the transmission line. 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.
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. Optimal reactive power dispatch tackles network loss reduction, increased power. This combines the fuzzy qualitative approach with the adaptive capabilities of neural networks to achieve improved performance. Power quality improvement in dfig based wind energy. Using flexible ac transmission system facts, it is possible to control the transmitted power through transmission lines and improve transient stability of the. 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. This paper proposes another genuine and receptive power coordination controller for a brought together power stream controller the. The upfc is bypassed and blocked during a fault occurrence to protect the upfc equipment. Abstract flexible ac transmission system facts devices uses power electronics components to. Voltage stability enhancement and efficiency improvement. This model is incorporated in newton raphson algorithm for load flow studies. The upfc is located at the center of a 160km 345kv line. The series inverter can be used to control thereal and reactive line power flow inserting anopportune voltage with.
Power system stability improvement using facts devices. Improvement of power flow in the power system network by using. 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. Stability improvement of power system by using psc controlled. This gives information about the upfc based control scheme to mitigate the power quality utility in transmission line bus with linear load. But the difference between the sendingend real power and receiving end real power is high in the transmission line with upfc. Keywords ac transmission, facts, power flow controller, line compensation. 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. The series converter of the upfc controls the real power flow in the transmission line. Cyme power engineering software and solutions power flow.
Design and analysis of unified power flow controller in. It is the basic analysis tool for the planning, design and operation of any electrical power system. Pdf single phase unified power flow controller upfc. Pdf power flow control with upfc in power transmission. In summary, facts devices are used to achieve the following major goals. Power flow control and voltage profile improvement using. 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. Upfc is investigated in controlling the flow of power over the transmission line. Power flow controller upfc and inter interline power flow controllers ipfc belong to the group1,2. Power flow improvement in transmission line using upfc. This research regarding the 6bus power system to control the active.
Tech, 2associate professor, 12dept of eee, brilliant institute of engineering and technology, ranga reddy, india. Transient stability improvement of smib with unified power. Optimal power flow control on power system transmission. 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. Improvement of power flow and voltage stability using unified power. Pdf power flow control through transmission line with. 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.
It is necessary to distinguish between the roles of the upfc as a power flow controller in order to achieve. A unified power flow controller upfc is an electrical device for providing fastacting reactive power compensation on highvoltage electricity transmission networks. Implementation of unified power flow controller upfc for. Power factor improvement using upfc electric power system. This paper concentrates on fact device upfc which is used for powerflow control in the transmission side. Power quality improvement using upfc research trend. 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.
Improvement of power flow and voltage stability using unified power flow controller abstract. With the growing demand of electricity, it is not possible to erect new lines to face the situation. Therefore, this paper presents thyristor based upfc controllers to improve the performance of multiii. The steadystate power flow in the 345 kv transmission line is 400 mw. With the information age in full swing, the growth of high reliability, low cost electronic products have led utilities to. But unified power flow controller upfc is such a versatile facts device that has the capability of controlling all the three parameters simultaneously. The 230 kv transmission line carries 100 mw of power. This paper presents improvement of power losses on transmission lines using unified power flow controller upfc for street lighting requirement. When no upfc is installed, real and reactive power through the transmission line can not be controlled.
Power flow control in transmission line using upfc device. In this paper the working of upfc is in the field of control flow of power in transmissionline. Pdf power flow control through transmission line with upfc. 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. State controllers, which provide functional flexibility. This device can be understood as a statcom and an sssc with a common dc link. Power system stability control is an important aspect. Performance improvement of electrical power system using upfc. 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. A unified power flow controller upfc is used to control the power flow in a 500 kv transmission system. Pdf power flow control using upfc device researchgate. In this paper the performance of unified power flow controller is investigated in controlling the flow of po wer over the transmission line. The real power p pq is assumed to be transferred to the sending end generator.
Capacitor less upfc for power quality improvement using. Improvement of power system stability by using upfc with. This paper discusses the designing of advanced control techniques for the operation of upfc. 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. 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. This paper presents real and reactive power flow control through a transmission line by placing upfc at the sending end using computer simulation. Control power flow using upfc and pst introduction.