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Journal articles on the topic 'Unified Power Flow Controller (UPFC)'

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Published: 4 June 2021
Last updated: 6 September 2023

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1

Satyavir, Singh. "Power flow control capability analysis of unified power flow controller." i-manager's Journal on Power Systems Engineering 10, no. 2 (2022): 12. http://dx.doi.org/10.26634/jps.10.2.18808.

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In the field of power system restructuring, Flexible Alternating Current Transmission System (FACTS) technology has become indispensable for alleviating the challenges of load flow control, voltage control, transient stability, and dynamic stability. The Unified Power Flow Controller (UPFC) is the fastest, most flexible, and most capable FACTS device because it has the full advantage of providing simultaneous and independent real-time control of voltage, impedance, and phase angle, which are the main power system parameters that affect system performance. This paper uses a Newton-Raphson load flow that includes UPFC to analyze how UPFC can control the flow of power.
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2

Shende, Divya, Prashant Jagtap, and Rutuja Hiware. "Review of enhanced power quality using unified power flow control system in electrical network." Journal of Physics: Conference Series 2089, no. 1 (November 1, 2021): 012034. http://dx.doi.org/10.1088/1742-6596/2089/1/012034.

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Abstract Flexible FACTS system of AC transmission. FACTS Devices can regulate electricity flow, develop the transmission capacity for power management. UPFC is a multipurpose fact controller carried on design of the constant voltage source. As an electrical device UPFC for rapid reactive power adjustment on high voltage electricity transport grid. Unified power flow control (UPFC). The latest FACTS gadget is UPFC. This combines series and shunting compensator characteristics and enables Power reactive and response to be controlled. UPFC utilization reduces difficulties in power quality including voltage sink and voltage surge. This article addresses UPFC and also several novel topologies for FACTS controllers.
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3

Pandian, Arun Nambi, and Aravindhababu Palanivelu. "Optimal UPFC Placement for Voltage Stability Enhancement." ECS Journal of Solid State Science and Technology 12, no. 4 (April 1, 2023): 044005. http://dx.doi.org/10.1149/2162-8777/accaa4.

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The Unified Power Flow Controller is a versatile and important device for improving the operational efficiency of power systems in the flexible AC transmission systems family. It finds applications in improving voltage stability in addition to provide a better voltage profile and reducing transmission loss. This paper presents a Chemical Reaction Inspired Optimization based method for placement of unified power flow controllers with the objective of raising the voltage stability. Most of the existing methods place all the given unified power flow controllers without analysing whether each of the given unified power flow controllers is actually needed to improve voltage stability or other selected performances. The proposed method tries to place only the essential unified power flow controllers from the allocated number of devices, besides providing optimal line locations and unified power flow controller parameters. It also includes the results of the proposed method for three standard test systems and compares them with existing methods to depict the dominance of the proposed method.
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4

Gopinath, B., S. Suresh Kumar, and Juvan Michael. "Stability Improvement in Power Systems Using Unified Power Flow Controller (UPFC)." Advanced Materials Research 768 (September 2013): 392–97. http://dx.doi.org/10.4028/www.scientific.net/amr.768.392.

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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 (UPFC) is the most widely used FACTS device for providing fast acting reactive power compensation on high voltage electricity transmission network. This paper deals with the designing of Adaptive Neuro Fuzzy Inference controller (ANFIC) and fuzzy based Particle Swarm Optimization (PSO) controller for the performance analysis of UPFC. The controller have been designed and tested for controlling the real and reactive power of UPFC. Fuzzy-PI controller is used to control the shunt part of UPFC. The system response under high short circuit level is tested on 5-bus system and 118-bus system. Computer simulation by MATLAB/SIMULINK has been used to verify proposed control strategies.
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5

H., Ananda M., and M. R. Shivakumar. "Particle swarm optimization tuned unified power flow controller for power oscillation reduction." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 2 (August 1, 2021): 633. http://dx.doi.org/10.11591/ijeecs.v23.i2.pp633-638.

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One of the best flexible AC transmission system (FACTS) is unified power flow controller (UPFC). As it gets more benefit from both real and reactive power transfer, it is used in power system for controlling the transmitted power. The UPFC controls the power on the transmission side of the power system. When the real as well as reactive power is set the UPFC tries to follow the command by using the proportional and integral (PI) controller. But in some power systems the PI controllers cannot produce the proper power due to the power oscillations. These oscillations are created due to PI controller properties. In this paper the PI controller is replaced with the particle swarm optimization tuned PI controller (PSO-PI). It minimizes the power oscillations by using the objective function. The MATLAB 2017b is used to demonstrate the power transfer curves and the voltages. The IEEE 9 bus system is being used as a reference system.
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6

Lee, Hyun-Jun, Dae-Shik Lee, and Young-Doo Yoon. "Unified Power Flow Controller Based on Autotransformer Structure." Electronics 8, no. 12 (December 13, 2019): 1542. http://dx.doi.org/10.3390/electronics8121542.

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This paper proposes a new unified power flow controller (UPFC) topology. A single phase of them system with the proposed topology consists of an N:2 transformer with a center tap at the low-voltage side and a power converter module comprising full- and half-bridge converters. A three-phase system can be implemented with three devices. While the conventional UPFC topology uses two three-phase transformers, which are called series and parallel transformers, the proposed topology utilizes three single-phase transformers to implement a three-phase UPFC system. By using an autotransformer structure, the power rating of the transformers and the voltage rating of switches in the power converter module can be significantly decreased. As a result, it is possible to reduce the installation spaces and costs compared with the conventional UPFC topology. In addition, by adopting a full- and half-bridge converter structure, the proposed topology can be easily implemented with conventional power devices and control techniques. The techniques used to control the proposed topology are described in this paper. The results obtained from simulations and experiments verify the effectiveness of the proposed UPFC topology.
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7

Alsammak, Ahmed Nasser, and Hasan Adnan Mohammed. "Power quality improvement using fuzzy logic controller based unified power flow controller." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 1 (January 1, 2021): 1. http://dx.doi.org/10.11591/ijeecs.v21.i1.pp1-9.

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<p>The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.</p>
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8

Kohno, Hirotoshi, Tatsuhito Nakajima, and Akihiko Yokoyama. "Power System Damping Enhancement using Unified Power Flow Controller (UPFC)." IEEJ Transactions on Power and Energy 119, no. 3 (1999): 344–53. http://dx.doi.org/10.1541/ieejpes1990.119.3_344.

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9

Suliman, Mohammed Y., and Mahmood T. Al-Khayyat. "Power flow control in parallel transmission lines based on UPFC." Bulletin of Electrical Engineering and Informatics 9, no. 5 (October 1, 2020): 1755–65. http://dx.doi.org/10.11591/eei.v9i5.2290.

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The power flow controlled in the electric power network is one of the main factors that affected the modern power systems development. The unified power flow controller (UPFC) is a FACTS powerful device that can control both active and reactive power flow of parallel transmission lines branches. In this paper, modelling and simulation of active and reactive power flow control in parallel transmission lines using UPFC with adaptive neuro-fuzzy logic is proposed. The mathematical model of UPFC in power flow is also proposed. The results show the ability of UPFC to control the flow of powers components "active and reactive power" in the controlled line and thus the overall power regulated between lines.
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10

Yang, Jian, Zheng Xu, and Zheren Zhang. "Analysis of Unified Power Flow Controller Steady-State Power Flow Regulation Capability and Its Key Factors." Energies 13, no. 17 (August 27, 2020): 4419. http://dx.doi.org/10.3390/en13174419.

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As the latest generation of flexible AC transmission system (FACTS) devices, the unified power flow controller (UPFC) has comprehensive control capability and has played an important role in modern power systems. Research on UPFC steady-state power flow regulation capability is valuable for the design and operation of UPFC projects. To analyze the UPFC regulation capability, in this paper, the interaction between the UPFC and the external system is studied and the key factors of UPFC regulation capability are analyzed. It is demonstrated that the changes in the voltage magnitude and phase angle difference of UPFC-embedded line terminals will hinder the UPFC from regulating the power flow and decrease the UPFC regulation capability. Therefore, the UPFC power flow regulation capability is not only related to the parameters of the UPFC and its installation line, but also related to grid parameters. To analyze the UPFC active power flow regulation capability in practical power grids, the relationship between the UPFC regulation capability and grid parameters is deduced, and an estimation method is proposed to calculate the regulation range. Then, the estimation method is applied in the Chuxiong Power Grid and compared with power flow calculations. The results verify the UPFC power flow regulation characteristics given by the analysis and the effectiveness of the estimation method. Besides, it is shown that the estimation method can lower the requirements for the power flow calculation program, and reduce computation load.
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11

C, Boopalan, and Saravanan V. "Certain Investigation of Real power flow control of Artificial Neural Network based Matrix converter-Unified Power Flow Controller in IEEE 14 Bus system." International Journal of Computer Communication and Informatics 2, no. 2 (October 30, 2020): 54–81. http://dx.doi.org/10.34256/ijcci2026.

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The power consumption is rapid increased due to ASD (Adjustable Speed Drives) and automation in industries and large consumption of electricity in domestic regions increased the concern of the power quality. The quality of the power received in the Distribution system is altered because of the losses in the transmission system. The losses in the transmission system is mitigated using the FACTS (Flexible AC Transmission System)controller among these controllers UPFC (Unified Power Flow Controller) plays a vital role in controlling the shunt and series reactive powers in the bus of the power system. The conventional topology of the UPFC consists of AC-DC converter and energy stored in the DC link and DC-AC converter injected a voltage in series to the bus which as to be controlled. Whereas a new topology based on matrix converter can replace the dual converters and perform the required task. The construction of 2-bus, 7-bus and IEEE-14-bus power system is designed and modeled. MC-UPFC (Matrix Converter Based Unified Power Flow Controller) is designed and constructed. The MC-UPFC is the rich topology in the FACTS which is capable of controlling both the transmission parameters simultaneously with the switching technique of Direct power control by the smooth sliding control which gives less ripple in the injecting control parameters such as control voltage [Vc] and voltage angle [α]. By implementing MC-UPFC the real and reactive power can be controlled simultaneously and independently. The control techniques were designed based on the Proportional Integral derivative(PID) with sliding surface power control, FLC (Fuzzy Logic Controller) and ANN (Artificial Neural Network) and the performance of Vc and α of the controllers are investigated. Hence the sliding surface and relevant control switching state of the MC can be controlled by the FLC which gives the robust and autonomous decision making in the selection of the appropriate switching state for the effective real power control in the power system. The work has been carried out in the MATLAB Simulink simulator which gives the finest controlling features and simple design procedures and monitoring of the output.
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12

Shende, Divya, Prashant Jagtap, and Rutuja Hiware. "Enhanced power quality using unified power flow controller systems." Journal of Physics: Conference Series 2089, no. 1 (November 1, 2021): 012035. http://dx.doi.org/10.1088/1742-6596/2089/1/012035.

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Abstract Electrical system frequently finds and issue due to unstable nature and power quality because of, in relation to great number of nonlinear charges. So, there is need to limit inside of these difficulties and produce fine voltage quality concerns. The Flexible Alternate Flow Transmission Systems (FACTS) are the framework made out of static gear works for the AC transmission of electrical energy. Unified_Power_Flow Controls (UPFC) are the excellent FACTS tools to attach series and shunt together and it could use for framing Power transmission sensitive and active power. Here in the paper, Unified Power Flow Control (UPFC) used to clear the voltage sink and Surge. Unified Control was developed and engineered using amplifiers and rectifiers. The real and reactive modifications in congruous control orientations at the receiver side. Use of Simulink of MATLAB checks quality of energy in the use of Unified Control.
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13

M .Patel, DR Dipesh, and Prof (Dr ). Karunesh Saxena. "Voltage and Reactive Power Control in DFIG Wind Farm Load bus by FACT Device – UPFC." Journal of University of Shanghai for Science and Technology 23, no. 12 (December 10, 2021): 207–11. http://dx.doi.org/10.51201/jusst/21/121011.

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This paper deals with the analysis and simulation of the Unified Power Flow Controller (UPFC) for Grid connected DFIG wind farm system mitigation. The purpose of the paper is to derive and analyze a reactive power control strategy of UPFC dedicated for DFIG mitigation. The FACT device Unified Power Flow Controller (UPFC) is connected with load bus. Paper has demonstrated the improvement in voltages, power transferred to grid, active and reactive power control. Matlab/simulink is used for the work. Paper demonstrated the simulation results for with and without UPFC for Grid connected Doubly Fed Induction Generator wind farm system.
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14

Keri, A. J. F., A. S. Mehraban, X. Lombard, A. Eiriachy, and A. A. Edris. "Unified power flow controller (UPFC): modeling and analysis." IEEE Transactions on Power Delivery 14, no. 2 (April 1999): 648–54. http://dx.doi.org/10.1109/61.754113.

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15

Hussain, A. N., F. Malek, M. A. Rashid, L. Mohamed, and N. A. Mohd Affendi. "Optimal Coordinated Design of Multiple Damping Controllers Based on PSS and UPFC Device to Improve Dynamic Stability in the Power System." Mathematical Problems in Engineering 2013 (2013): 1–15. http://dx.doi.org/10.1155/2013/965282.

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Unified Power Flow Controller (UPFC) device is applied to control power flow in transmission lines. Supplementary damping controller can be installed on any control channel of the UPFC inputs to implement the task of Power Oscillation Damping (POD) controller. In this paper, we have presented the simultaneous coordinated design of the multiple damping controllers between Power System Stabilizer (PSS) and UPFC-based POD or between different multiple UPFC-based POD controllers without PSS in a single-machine infinite-bus power system in order to identify the design that provided the most effective damping performance. The parameters of the damping controllers are optimized utilizing a Chaotic Particle Swarm Optimization (CPSO) algorithm based on eigenvalue objective function. The simulation results show that the coordinated design of the multiple damping controllers has high ability in damping oscillations compared to the individual damping controllers. Furthermore, the coordinated design of UPFC-based POD controllers demonstrates the superiority over the coordinated design of PSS and UPFC-based POD controllers for enhancing greatly the stability of the power system.
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16

John Rose, A., G. Anandha Kumar, A. Ragavendiran, and A. Kalaimurugan. "Model Predictive Controlled Four-Bus System Employing Hybrid Power Flow Controller." Journal of Sensors 2023 (March 3, 2023): 1–10. http://dx.doi.org/10.1155/2023/4621537.

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A fuzzy logic- (FL-) based control technique for unified power flow controller (UPFC) to resolve the power quality issues in transmission network is presented in this paper. MATLAB/Simulink is used to design the FL-based controllers for shunt and series converters of UPFC, which is validated on 4-bus system. In addition, the performance of the suggested FL-based UPFC is compared with PI (proportional integral), HC (hysteresis controller), MPC (model predictive controller), and FLC (fuzzy logic controller), and the outcomes are compared in terms of settling time and steady-state error. The consequences characterize that the higher enactment of closed loop hybrid power flow controller (HPFC) 4-bus system with FLC UPFC controller’s (FL based) robustness is ensured from the simulation results as it has overcome the power quality issues like reactive power compensation, voltage sag mitigation, and THD reduction of transmission line current below 5% as per IEEE standard. Settling time of CL FBS is abridged from 0.87 to 0.62 sec, and steady-state error of voltage in CL FBS is abridged from 0.9 to 0.1 V using FLC.
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Markovic, Aleksandar, and Slobodan Vukosavic. "Control of series impedance of power lines using power flow controller." Facta universitatis - series: Electronics and Energetics 35, no. 3 (2022): 421–35. http://dx.doi.org/10.2298/fuee2203421m.

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In this paper, the possibility of unified power flow controller (UPFC) to modulate both series resistance R and series reactance X of an overhead power line is discussed. The classical power flow control system of the UFPC is modified in the manner that standard input references signals (active and reactive powers) are replaced by reference signals of series resistance and reactance. Using the procedure described in this work, the reference signals for active and reactive powers are generated indirectly. The operation of UPFC in proposed operation mode is analyzed using computer simulation, based on a model of single machine infinite bus (SMIB) with constant impedance loads and two parallel lines. The goal is to show that UPFC is capable to control both series line parameters (R and X) directly and independently by means of a simple control system without additional decoupling controllers. An additional task is to show that power flows can be indirectly controlled this way. The step response of series line resistance and reactance is used to validate the operation of the proposed control system. The obtained results clearly show that all goals are fulfilled.
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Hu, Yuan, Peng Wu, Zhaojun Hou, Ning Wang, Shuai Zhang, Yan Li, Penghui Zhao, Ming Gao, and Tianhao Li. "Study on voltage stability considering unified power flow controller." Journal of Physics: Conference Series 2427, no. 1 (February 1, 2023): 012032. http://dx.doi.org/10.1088/1742-6596/2427/1/012032.

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Abstract The access of the unified power flow controller (UPFC) can better meet the requirements of new power system construction with a high proportion of non-fossil energy and large-scale access, and it is more intelligent than the traditional control mode. Through the sensitivity analysis of the Jacobian matrix, the voltage stability of the power system before and after the access to the unified power flow controller is compared, and the simulation analysis in MATLAB/PSAT environment is adopted to simulate the IEEE9-bus system, showing that the access of UPFC achieves the effect of flexible control and can effectively improve the voltage stability of the system.
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19

Mathad, Vireshkumar, and Gururaj Kulkarni. "Artificial-neural-network based unified power flow controller for mitigation of power oscillations." Indonesian Journal of Electrical Engineering and Computer Science 24, no. 3 (December 1, 2021): 1323. http://dx.doi.org/10.11591/ijeecs.v24.i3.pp1323-1331.

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The series and shunt control scheme of unified power flow controller (UPFC) impacts the performance and stability of the power system during power swing. UPFC is the most versatile and voltage source converter device as it can control the real and reactive power of the transmission system simultaneously or selectively. When any system is subjected to any disturbance or fault, there are many challenges in damping power oscillation using conventional methods. This paper presents the neural network-based controller that replaces the proportional-integral (PI) controller to minimize the power oscillations. The performance of the artificial neural network (ANN) controller is evaluated on IEEE 9 bus system and compared with a conventional PI controller.
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Saini, Kuldeep, Aakash Saxena, and M. R. Farooqi. "Analysis of Distributed Power Flow Controller in Power System Network for Improving Power Flow Control." Indonesian Journal of Electrical Engineering and Computer Science 2, no. 3 (June 1, 2016): 510. http://dx.doi.org/10.11591/ijeecs.v2.i3.pp510-521.

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<p>In this paper, a new power flow controlling device called Distributed Power Flow Controller (DPFC) is presented that offers the same control capability as the unified power-flow controller (UPFC) but with much lower cost and high reliability. The DPFC eliminates the common DC link within the UPFC, to enable the independent operation of the shunt and the series converter. The D-FACTS concept is employed to the series converter to increase the reliability. Multiple low-rating single-phase converters replace the high-rating three-phase series converter, which significantly reduces the cost and increases the reliability. The active power that is exchanged through the common DC link in the UPFC is now transferred through the transmission line at the 3rd harmonic frequency. The DPFC is modeled in a rotating dq-frame. The modeling and analysis of DPFC in a two area two bus interconnected system is done in MATLAB/Simulink environment and comparison between the DPFC and UPFC considering the power flow and cost are also shown.</p><p> </p>
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Kohno, Hirotoshi, Tatsuhito Nakajima, and Akihiko Yokoyama. "Power system damping enhancement using unified power flow controller (UPFC)." Electrical Engineering in Japan 133, no. 3 (2000): 35–47. http://dx.doi.org/10.1002/1520-6416(20001130)133:3<35::aid-eej5>3.0.co;2-k.

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Hassan, Sana Khalid Abdul, and Firas Mohammed Tuaimah. "Optimal location of unified power flow controller genetic algorithm based." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 2 (June 1, 2020): 886. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp886-894.

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<p>Now-a-days the Flexible AC Transmission Systems (FACTS) technology is very effective in improving the power flow along the transmission lines and makes the power system more flexible and controllable. This paper deals with overload transmission system problems such as (increase the total losses, raise the rate of power generation, and the transmission line may be exposed to shut down when the load demand increase from the thermal limit of transmission line) and how can solve this problem by choosing the optimal location and parameters of Unified Power Flow Controllers (UPFCs). which was specified based on Genetic Algorithm (GA) optimization method, it was utilized to search for optimum FACT parameters setting and location based to achieve the following objectives: improve voltages profile, reduce power losses, treatment of power flow in overloaded transmission lines and reduce power generation. MATLAB was used for running both the GA program and Newton Raphson method for solving the load flow of the system The proposed approach is examined and tested on IEEE 30-bus system. The practical part has been solved through Power System Simulation for Engineers (PSS\E) software Version 32.0 (The Power System Simulator for Engineering (PSS/E) software created from Siemens PTI to provide a system of computer programs and structured data files designed to handle the basic functions of power system performance simulation work, such as power flow, optimal power flow, fault analysis, dynamic simulations...etc.). The Comparative results between the experimental and practical parts obtained from adopting the UPFC where too close and almost the same under different loading conditions, which are (5%, 10%, 15% and 20%) of the total load. can show that the total active power losses for the system reduce at 69.594% at normal case after add the UPFC device to the system. also the reactive power losses reduce by 75.483% at the same case as well as for the rest of the cases. in the other hand can noted the system will not have any overload lines after add UPFC to the system with suitable parameters.</p>
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Fathima, K. A. Rani, and T. A. Raghavendiran. "Augmentation of Real Power from Renewable Energy Sources across the DC Link of the UPFC Using Fuzzy Logic Control Scheme." Applied Mechanics and Materials 573 (June 2014): 66–71. http://dx.doi.org/10.4028/www.scientific.net/amm.573.66.

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The Unified Power Flow Controller (UPFC) is accepted as the versatile Power Flow Controller between electrical power nodes or power sources many times referred to as the buses. Regulation of real and reactive power flow between power nodes can be achieved in the desired manner using the UPFC. In this paper it is demonstrated how additional real power sources like Wind and Photo Voltaic Solar power sources can be augmented into the DC link of the UPFC and supplementing the seamless performance of the UPFC. Fuzzy Logic has been chosen to be the controller as it is moderately robust and its usefulness in this application is compared and contrasted against traditional PI controller. MATLAB / SIMULINK based simulation environment has been used for demonstrating the validity of the proposed schemes.
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Rao, B. Venkateswara, and G. V. Nagesh Kumar. "Multi-Objective Optimal Power Flow using BAT Search Algorithm with Unified Power Flow Controller for Minimization of Real Power Losses." International Journal of Applied Metaheuristic Computing 6, no. 4 (October 2015): 69–88. http://dx.doi.org/10.4018/ijamc.2015100104.

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In this paper a multi objective optimal power flow (OPF) is obtained by using BAT search algorithm (BAT) with Unified power flow controller (UPFC). UPFC is a voltage source converter type Flexible Alternating Current Transmission System (FACTS) device. It is able to control the voltage magnitudes, voltage angles and line impedances individually or simultaneously. UPFC along with BAT algorithm is used to minimize the total real power generation cost, real power losses in OPF control. The BAT algorithm based OPF has been examined and tested on a 5 bus test system and modified IEEE 30 bus system without and with UPFC. The results obtained with BAT algorithm are compared with Differential Evaluation (DE).
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Al-Kaoaz, Hiba Nadhim A., and Ahmed Nasser B. Alsammak. "Performance enhancement of distance relay in presence of unified power flow controller." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 3 (September 1, 2023): 1577. http://dx.doi.org/10.11591/ijpeds.v14.i3.pp1577-1588.

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The characteristics of the distance relay are devised based on online and fault impedance. The relay uses fault information to react to the expected state; however, integrating the grid with a unified power flow controller (UPFC) might stop the relay from fault-triggered operations, requiring altered relay characteristics. Building relay tripping parameters are among the critical challenges that must be addressed for transmission line distance relays because current transmission networks face higher stress regarding power system operation. Furthermore, the use of flexible AC transmission systems (FACTS) instruments at the transmission level adversely affects distance relay performance due to impedance differences. The UPFC is among the essential FACTS instruments; it comprises shunt and series converters to alter the apparent relay impedance; hence, it was considered for this study, where a test system during fault was assessed to demonstrate the output of the distance relay before and after using the UPFC. MATLAB was used to build scenarios demonstrating the effect of a UPFC located in the transmission line's midsection or end or not using the UPFC. This research offers an analytical technique to determine the probable effects of UPFC on distance relay characteristics. The outcomes provide new relay characteristics for several fault resistances and locations for fault-specific impedance trajectory reactions.
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Selvarasu, R., and C. Christober Asir Rajan. "Simulation of Location of TCSC and UPFC in Fourteen Bus System Using Matlab / Simulink." Advanced Materials Research 403-408 (November 2011): 3594–99. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.3594.

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This paper presents the modeling and simulation of 14-bus system using TCSC and UPFC. Thyristor Controlled Series Compensator (TCSC) and Unified Power Flow Controller (UPFC) are included in 14-bus system to improve the power quality of the power system. The voltage sag is created by adding an extra load at the receiving end. This sag is compensated by using FACTS devices like TCSC and UPFC. Improvement in the voltage and power are presented using simulation studies.
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Sen, K. K., and E. J. Stacey. "UPFC-unified power flow controller: theory, modeling, and applications." IEEE Transactions on Power Delivery 13, no. 4 (1998): 1453–60. http://dx.doi.org/10.1109/61.714629.

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Zhang, Fang, Jian Ping Chen, Chuan Dong Li, and Yan Juan Wu. "Research on Power Flow Control of UPFC Based on PSASP/UPI." Applied Mechanics and Materials 385-386 (August 2013): 1078–81. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1078.

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The main objective of power flow control for unified power flow controller (UPFC) is to increase the transmission capacity over the existing transmission corridor or line. This paper presents a practical engineering methodology of embedding the power flow control model of UPFC into the commercial software -- power system analysis software package (PSASP) based on its user program interface (UPI) function. In the proposed methodology, the interface currents of UPFC series side and UPFC shunt side between the UPFC device and the network are used to control the transmission line power flow and UPFC bus voltage, respectively. In UPFC series side, the current of UPFC series branch is calculated from the power target equation of the controlled line. In UPFC shunt side, the shunt reactive current of UPFC is used to control the bus voltage. Simulation results on a practical power system show that the proposed methodology can be efficiently applied to the engineering research and analysis of the real power grid with UPFC with good convergence and only one control parameter needed to be prescribed.
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Bedasso*, Million Alemayehu, and R. Srinu Naik. "Optimal Placement of Unified Power Flow Controller by TOPSIS Method for Loss Minimization." International Journal of Recent Technology and Engineering 10, no. 1 (May 30, 2021): 126–31. http://dx.doi.org/10.35940/ijrte.a5702.0510121.

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In order to eliminate active and reactive power losses in the power system, this paper proposes TOPSIS and DE algorithm for determining the best location and parameter settings for the Unified Power Flow Controller (UPFC). To mitigate power losses, the best UPFC allocation can be achieved by re-dispatching load flows in power systems. The cost of incorporating UPFC into the power system. As a consequence, the proposed objective feature in this paper was created to address this problem. The IEEE 14-bus and IEEE 30-bus systems were used as case studies in the MATLAB simulations. When compared to particle swarm optimization, the results show that DE is a simple to use, reliable, and efficient optimization technique than (PSO). The network's active and reactive power losses can be significantly reduced by putting UPFC in the optimum position determined by TOPSIS ranking method.
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Valuva, Chandu, and Subramani Chinnamuthu. "Performance Analysis of Marine-Predator-Algorithm-Based Optimum PI Controller with Unified Power Flow Controller for Loss Reduction in Wind–Solar Integrated System." Energies 16, no. 17 (August 24, 2023): 6157. http://dx.doi.org/10.3390/en16176157.

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Transmission line losses are a crucial and essential issue in stable power system operation. Numerous methodologies and techniques prevail for minimizing losses. Subsequently, Flexible Alternating Current Transmission Systems (FACTSs) efficiently reduce transmission losses, and the Unified Power Flow Controller (UPFC) is a reactive power compensation controller. The parameter strength of the proportional–integral (PI) controller was calibrated with the Marine Predator Algorithm (MPA), a recent metaheuristic algorithm. An MPA-based optimum PI controller with a UPFC evaluates the optimal location of the UPFC and PI controller parameters to accomplish the desired research objective. The power rating of the UPFC was determined depending on the voltage collapse rating and power loss and an evaluated performance analysis of the MPA–PI-controlled UPFC on a modified IEEE-30 bus transmission network in MATLAB Simulink code. The Newton–Raphson method was used to perform the load flow analysis. Hence, the proposed MPA–PI controller was examined in contrast to preferred heuristic algorithms, the Artificial Bee Colony (ABC) and Moth Flame Optimization algorithms (MFO); the results showed that the MPA–PI controller exhibited better performance with an improved voltage profile and surpasses active power losses with the optimal placement of the UPFC device under different loading conditions. The active power loss, considering a UPFC with the proposed algorithm, reduced from 0.0622 p.u to 0.0301 p.u; consequently, the voltage profile was improved in the respective buses, and the loss percentage reduction during a 100% base load was 68.39%, which was comparatively better than the ABC and MFO algorithms.
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Arun, Bose, and B. V. Manikandan. "Transient Stability Enhancement Using Multilevel Inverter Based UPFC." Applied Mechanics and Materials 573 (June 2014): 722–27. http://dx.doi.org/10.4028/www.scientific.net/amm.573.722.

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Power flow control is important in power systems and recently becomes more urgent because of the deregulation. This paper presents a novel configuration of unified power flow controller and performance of UPFC intended for installation on transmission line. When no UPFC is installed, any interruption in the line due to fault reduces the active power flow through the line. Installing the UPFC makes it possible to control an amount of active power flow through the line. Simulations were carried out using Matlab to validate the performance of UPFC. Keywords: FACTS Devices, UPFC, Transient stability, Matlab, Fault simulation.
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Araga, Idris A., and A. E. Airoboman. "Enhancement of voltage stability in an interconnected network using unified power flow controller." Journal of Advances in Science and Engineering 4, no. 1 (January 2, 2021): 65–74. http://dx.doi.org/10.37121/jase.v4i1.141.

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In this paper, the optimal placement of Unified Power Flow Controllers (UPFC) in a large-scale transmission network in order to improve the loadability margin was considered. In other to achieve this aim, the Line Stability Factor (LQP) as a technique for the optimal location of UPFC in the IEEE 14-bus network and 56-bus Nigerian national grid was adopted. The power injection model for the UPFC was employed to secure improvements in the loading margin of the IEEE 14-bus network and 56-bus Nigerian national grid system. Continuation power flow was used to assess the effect of UPFC on the loadability margin. Steady-state simulations using Power System Analysis Toolbox (PSAT) on MATLAB was applied to determine the effectiveness of placing UPFC between bus 13 and bus 14 in the IEEE 14-bus network and between bus 44 (Ikot-Ekpene) and bus 56 (Odukpani) in the 56-bus Nigerian national grid system. The results showed that the loadability margin increased by 8.52 % after UPFC was optimally placed in the IEEE 14-bus network and increased by 195.5 % after UPFC was optimally placed in the 56-bus Nigerian national grid system. Thus, these enhance the voltage stability of both network and utilizing the network efficiently.
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Gianto, Rudy. "Penggunaan UPFC (Unified Power Flow Controller) untuk Perbaikan Kestabilan Sistem Tenaga Listrik yang Terinterkoneksi." Electrician 15, no. 1 (January 29, 2021): 25–32. http://dx.doi.org/10.23960/elc.v15n1.2179.

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Intisari — Makalah ini membahas penggunaan peralatan FACTS (Flexible AC Transmission Systems) untuk meningkatkan atau memperbaiki kestabilan sistem tenaga listrik yang terinterkoneksi. Peralatan FACTS pada umumnya digunakan untuk mengendalikan aliran daya-aktif dan/atau daya-reaktif serta untuk mengontrol besarnya tegangan sistem. Namun demikian, dengan memasang alat kontrol tambahan, peralatan FACTS dapat digunakan untuk meningkatkan redaman elektromekanik dan kestabilan sistem tenaga listrik sebagai fungsi sekundernya. Salah satu peralatan FACTS yang cukup populer saat ini adalah UPFC (Unified Power Flow Controller). UPFC merupakan peralatan FACTS generasi ketiga. Peralatan ini menggabungkan kompensator shunt dan kapasitor seri statik menjadi satu peralatan dengan sistem kendali terpadu. UPFC memiliki kemampuan unik untuk mengendalikan aliran daya listrik dan tegangan secara simultan sehingga memiliki potensi untuk digunakan dalam meningkatkan redaman dan kestabilan sistem. Makalah ini menyelidiki aplikasi dari UPFC pada peningkatan kestabilan sistem tenaga listrik yang terinterkoneksi. Keefektifan dari peralatan tersebut dalam memperbaiki penampilan dinamik dan meningkatkan kestabilan suatu sistem tenaga telah dikonfirmasi melalui hasil-hasil perhitungan nilaieigen dan divalidasi dengan menggunakan simulasi domain-waktu.Kata kunci — FACTS, UPFC, Redaman, Kestabilan, Sistem Tenaga Listrik Abstract — This paper discusses an application of FACTS (Flexible AC Transmission Systems) device in improving the stability of interconnected electric power system. FACTS devices are used primarily for controlling active- and/or reactive-power and also for voltage regulation. However, by employing some supplementary controllers, it can also be used for enhancing system electromechanical damping and stability as its secondary function. One of the most popular FACTS devices is UPFC (Unified Power Flow Controller). UPFC is a third generation of FACTS device. This device combines the shunt compensator and static series capacitor as one device with a unified control system. UPFC has a unique ability in controlling simultaneously system power flow and voltage, and therefore, has a potential to be used for system damping and stability improvement. This paper investigates an application of UPFC in improving the stability of interconnected power system. The effectiveness of the device in enhancing system dynamic performance and stability has been confirmed through eigenvalue calculations and validated using time-domain simulations.Keywords— FACTS, UPFC, Damping, Stability, Electric Power System
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34

Sule, Aliyu Hamza. "Unified Power Flow Controller: A Brief Review on Tuning and Allocation for Power System Stability." European Journal of Theoretical and Applied Sciences 1, no. 4 (July 6, 2023): 799–813. http://dx.doi.org/10.59324/ejtas.2023.1(4).73.

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The Power System can become unstable due to disturbances. To enhance system stability the Unified Power Flow Controller (UPFC) is tuned and allocated in the System. In this paper, a brief review of UPFC tuning and allocation studies for power systems stability is presented. The databases consulted for literature are the IEEE Xplore, ScienceDirect, Google Scholar and IOP Publications. The search terms used are Allocation, Tuning, UPFC, Power System and Stability to find the literature used in this review. A total of 26 Journal articles and conference papers were found and reviewed based on tuning and allocation studies. The Researchers applied Fuzzy coordination, Genetic Algorithm (GA), Particles Swarm Optimization (PSO), Grey Wolf Optimization (GWO) and Linear Quadratic Tracker (LQT) to tune the UPFC for enhancing power system stability. For studies on UPFC allocation in power systems, the Researchers applied frequency response of power system transfer function, power flow, Tabu Search (TS), PSO and GA. For allocation based on optimization, the Researchers minimized power losses, voltage index and investment costs considering equality and inequality constraints.
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35

Yang, Jian, and Zheng Xu. "Power Flow Calculation Methods for Power Systems with Novel Structure UPFC." Applied Sciences 10, no. 15 (July 25, 2020): 5121. http://dx.doi.org/10.3390/app10155121.

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Latest unified power flow controller (UPFC) projects adopt novel device structures to meet the requirements of practical applications. Developing power flow calculation methods for these new UPFC structures is of great significance for the design and operation of related projects. To address this issue, this paper deduces an equivalent model of the general structure UPFC, and presents the modified power mismatch equations and Jacobian matrix of the system. Then, three power flow calculation methods suitable for the novel structure UPFC are proposed based on the Newton–Raphson algorithm. The main difference between the three methods is the processing method of UPFC equivalent power injections and the Jacobian matrix. The characteristics of these methods are compared by case studies. Results demonstrate the effectiveness of the three methods for different UPFC structures, and it is found that the improved method, which considers the impact of the Jacobian matrix modifications in UPFC equivalent power injections, can realize power flow calculation in existing calculation programs, and improve the convergence characteristics.
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36

ADETONA, SUNDAY, RAIFU SALAWU, FRANK OKAFOR, and JOSEPH ADEYEMI. "THE IMPACT OF THE UNIFIED POWER FLOW CONTROLLER ON MAXIMIZATION OF LOADABILITY OF ELECTRIC POWER GRID." Journal of Engineering Studies and Research 26, no. 4 (January 8, 2021): 14–26. http://dx.doi.org/10.29081/jesr.v26i4.231.

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The building of additional transmission network to meet the demand of the ever-increasing load is expensive, and time consuming. An alternative to constructing new lines is the incorporation of the Flexible Alternating Current Transmission System (FACTS); in which a Unified Power Flow Controller (UPFC) is a member of the ménage, which can be modelled as a combination of Static Var Compensator and Thyristor Control Series Compensator. This study determines the optimal location of the UPFC by randomly adding loads to the existing transmission network until the Fast Voltage Stability Index of one of the lines is at a critical point. This is the vital line in which UPFC components are added. The sizing of the components of the UPFC is determined using Artificial Bee Colony algorithm. The IEEE 30-bus network is exploited as the test bed. The results obtained reveal that the optimal positioning and sizing of the UPFC for the purpose of maximizing loadability of the grid when load angles are assumed to be negligible are the same as when the load angles are considered. The loadability of the test bed when UPFC is not injected in the grid is 440.376 MW, whereas, it is 837.915 MW when the UPFC is optimally located and sized; and this represents 90.27 %. The sizes of the shunt and series components of the UPFC that assist in realizing this maximization are -0.2780 pu and 0.1000 pu respectively.
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37

Bhavithira, V., and A. Amudha. "Enhancement of Available Transfer Capability Using FACTS Controller." Applied Mechanics and Materials 573 (June 2014): 340–45. http://dx.doi.org/10.4028/www.scientific.net/amm.573.340.

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Abstract. This paper discusses about the available transfer capability by using Unified Power Flow Controller-UPFC. Flexible AC Transmission System-FACTS devices helps to reduce power flow on overloaded lines, thereby increasing the loadability of the power system, transient stability, damp out oscillations and also provide security and efficient transmission system. UPFC is one of the most versatile FACTS controllers. It is used for both shunt and series compensation. Newton Raphson method is used to calculate load flow for IEEE 30 bus system. By optimally placing the FACTS device Available Transfer Capability-ATC is improved. The ATC is calculated by using AC Power Transfer Distribution Factor- ACPTDF and this method is based on the sensitivity approach. Imperialistic Competitive Algorithm (ICA) is used to find optimal location of placing UPFC to improve ATC.
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Ranganathan, Selvarasu, and S. Rajkumar. "Self-Adaptive Firefly-Algorithm-Based Unified Power Flow Controller Placement with Single Objectives." Complexity 2021 (July 30, 2021): 1–14. http://dx.doi.org/10.1155/2021/5571434.

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The selection of positions for unified power flow controller (UPFC) placement in transmission network is an essential factor, which aids in operating the system in a more reliable and secured manner. This paper focuses on strengthening the power system performance through UPFC placement employing self-adaptive firefly algorithm (SAFA), which selects the best positions along with parameters for UPFC placement. Three single objectives of real power loss reduction, voltage profile improvement, and voltage stability enhancement are considered in this work. IEEE 14, 30, and 57 test systems are selected to accomplish the simulations and to reveal the efficacy of the proposed SAFA approach; besides, solutions are compared with two other algorithms solutions of honey bee algorithm (HBA) and bacterial foraging algorithm (BFA). The proposed SAFA contributes real power loss reduction, voltage profile improvement, and voltage stability enhancement by optimally choosing the placement for UPFC.
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Tambey, N., and M. L. Kothari. "Damping of power system oscillations with unified power flow controller (UPFC)." IEE Proceedings - Generation, Transmission and Distribution 150, no. 2 (2003): 129. http://dx.doi.org/10.1049/ip-gtd:20030114.

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A., Immanuel, Challa Babu, Sudheer P., Pavan Kumar Naidu R., and Nageswara Rao Atyam. "Adaptive FPA Algorithm based OPF with Unified Power Flow Controller." EAI Endorsed Transactions on Energy Web 9, no. 40 (October 12, 2022): e4. http://dx.doi.org/10.4108/ew.v9i40.150.

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In this work a novel modified flower pollination algorithm has been developed to solve the problem of single and multi-objective Optimal Power Flow operations for Unified power Flow Controller in Flexible Alternating Current Transmission Systems. In the proposed Adaptive Flower Pollination Algorithm the best initial solution can be chosen from the fittest and also the weights are adaptively adjusted to get better convergence characteristics. The nature of the objective functions is non-linear and difficult to get best possible solutions within the boundary conditions of total power demand. The weak nodes are determined in the system to locate the UPFC with Fuzzy approach considering input parameters as L-Index and voltage magnitudes. The projected method is validated using IEEE-30 and IEEE-57 bus systems for three objective functions, namely, system real power loss minimization, fuel cost minimization and the combination of total generating cost and system real power loss. Results of Fuzzy- Adaptive Flower Pollination Algorithm based OPF optimization for UPFC produced optimum results for the considered objectives of total fuel cost, real power loss and for the multiobjective.
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He, Ping, Seyed Arefifar, Congshan Li, Fushuan Wen, Yuqi Ji, and Yukun Tao. "Enhancing Oscillation Damping in an Interconnected Power System with Integrated Wind Farms Using Unified Power Flow Controller." Energies 12, no. 2 (January 21, 2019): 322. http://dx.doi.org/10.3390/en12020322.

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The well-developed unified power flow controller (UPFC) has demonstrated its capability in providing voltage support and improving power system stability. The objective of this paper is to demonstrate the capability of the UPFC in mitigating oscillations in a wind farm integrated power system by employing eigenvalue analysis and dynamic time-domain simulation approaches. For this purpose, a power oscillation damping controller (PODC) of the UPFC is designed for damping oscillations caused by disturbances in a given interconnected power system, including the change in tie-line power, the changes of wind power outputs, and others. Simulations are carried out for two sample power systems, i.e., a four-machine system and an eight-machine system, for demonstration. Numerous eigenvalue analysis and dynamic time-domain simulation results confirm that the UPFC equipped with the designed PODC can effectively suppress oscillations of power systems under various disturbance scenarios.
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C, Subramani, S. S. Dash, Vimala C, and Uma Mageshwari. "Impact of Distributed Power Flow Controller to Improve Line Flow Based on PWM Control with PI Technique." Indonesian Journal of Electrical Engineering and Computer Science 4, no. 1 (November 4, 2016): 57. http://dx.doi.org/10.11591/ijeecs.v4.i1.pp57-64.

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<p>In this paper we presents a new component within the flexible ac-transmission system (FACTS) family, called Distributed Power-Flow Controller (DPFC). The DPFC is derived from the unified power-flow controller (UPFC). The DPFC can be considered as a UPFC with an eliminated common dc link. The active power exchange between the shunt and series converters, which is through the common dc link in the UPFC, is now through the transmission lines at the third-harmonic frequency. The DPFC employs the distributed FACTS (DFACTS) concept, which is to use multiple small-size single-phase converters instead of the one large-size three-phase series converter in the UPFC. The large number of series converters provides redundancy, thereby increasing the system reliability. As the D-FACTS converters are single-phase and floating with respect to the ground, there is no high-voltage isolation required between the phases. Accordingly, the cost of the DPFC system is lower than the UPFC. The DPFC has the same control capability as the UPFC, which comprises the adjustment of the line impedance, the transmission angle, and the bus voltage. The controller is designed to achieve the most appropriate operating point based on the real power priority.</p>
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Hinda, Abdellatif, Mounir Khiat, and Zinelaabidine Boudjema. "Advanced control scheme of a unifiedpower flow controller using sliding mode control." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 2 (June 1, 2020): 625. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp625-633.

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This paper presents an advanced control scheme based on sliding mode control of a unified power flow controller (UPFC). This controller can generate a number of benefits in terms of static and dynamic operation of the power system such as the control law is synthesized with two kinds of controllers: sliding mode controller (SMC), and proportional integral (PI). Their respective performances are compared in terms of reference monitoring, sensitivity to disturbances and robustness. We have to study the problem of controlling power in electric system by UPFC. The simulation results show the effectiveness of the proposed strategy especially in chattering-free behavior, response to sudden load variations and robustness. All the simulations for the above work have been carried out using MATLAB/Simulink. Various simulations have given very satisfactory results and we have successfully improved the active and reactive power flows on a line of transmission, as well as to control voltage at the bus where it is connected, the studies and illustrate the effectiveness and capability of UPFC in improving power.
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44

Nasser, Ahmed, and Hasan Adnan. "A Literature Review on the Unified Power Flow Controller UPFC." International Journal of Computer Applications 182, no. 12 (August 14, 2018): 23–29. http://dx.doi.org/10.5120/ijca2018917775.

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45

Kumar Reddy, K. Manoz. "Transmission Loss Minimization Using Advanced Unified Power Flow Controller (UPFC)." IOSR Journal of Engineering 02, no. 05 (May 2012): 1049–52. http://dx.doi.org/10.9790/3021-020510491052.

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46

Shende, Mahesh. "Improvement of Power Quality in Distribution System using Photovoltaic based DPFC." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 15, 2021): 1038–42. http://dx.doi.org/10.22214/ijraset.2021.35049.

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In Modern Power System power quality is the main issue of the power companies. Improvement of power quality in distribution system using photovoltaic based DPFC is declared in this paper. Flexible AC Transmission System (FACTS) device which is known as distributed power flow controller (DPFC)is used. DPFC is derived from UPFC by eliminating common dc link between series and shunt converter. Unified power flow controller (UPFC) is widely used and control all parameters of the system. The UPFC handle the current and voltage with high rating; therefore, the cost of system is high. Therefore, distributed power flow controller (DPFC) is used due to high control capability, high Reliability & low cost. DPFC also measures the transmission angle, line impedance and bus voltage. In distribution system problems occur like voltage sag/swell, Harmonics etc. Photovoltaic system is used as source for DPFC.
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47

Latha, Bojaraj Soumya, and A. Amudha. "Optimal Placement of Unified Power Flow Controller in the Transmission Line Using SFL Algorithm." Applied Mechanics and Materials 573 (June 2014): 352–55. http://dx.doi.org/10.4028/www.scientific.net/amm.573.352.

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A power system structure has the generation, transmission and the distribution systems. During the transfer of power from the generation system to the distribution system, transmission line losses are occurred. To reduce the losses and keep the system stable, many controllers are being used. The Flexible AC Transmission systems (FACTS) are the modern controllers finding application in the power systems. The Unified Power Flow Controller (UPFC) is considered to be the best among the FACTS devices. It is installed in the transmission line to maintain the voltage of the system within the prescribe limits. The location to fix the UPFC is found using Shuffled Leap Frog Algorithm (SLFA). The transformer ratio is varied from its nominal value. Testing is done using an IEEE 30 bus system and the results are discussed.
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48

Shemshadi, Asaad, and Pourya Khorampour. "Effect of unified power flow controller installation in dual feed induction generator (DFIG) wind turbines." Energy Harvesting and Systems 8, no. 2 (October 29, 2021): 73–79. http://dx.doi.org/10.1515/ehs-2021-0015.

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Abstract In recent years, the use of wind energy to generate electricity in the world has been accelerating and growing. Wind farms are unstable when dynamic voltage fluctuations occur, especially sudden and sudden changes in load, and show oscillating performance at their output. In this paper, the Unified Power Flow Controller (UPFC) has been simulated and studied by Matlab software to improve the dynamic stability and transient behavior of the wind power plant in the event of sudden load changes. The simulation results show that by controlling the UPFC series inverter, voltage fluctuations in the PCC bus are prevented and the UPFC parallel inverter injects power after changing the load for faster recovery and stability of the PCC bus voltage and thus the stability of the wind farm. The UPFC can control the active and reactive power at the transmission line, and in fact, controls the output of the wind turbine with the generator from both sides to the fluctuations caused by sudden load changes that play a role such as sudden disturbances and oscillating errors. Also, the presence of UPFC in the system reduces power fluctuations.
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E. Mubeen, Samina, Baseem Khan, and R. K. Nema. "Application of Unified Power Flow Controller to Improve Steady State Voltage Limit." IAES International Journal of Robotics and Automation (IJRA) 6, no. 4 (December 1, 2017): 277. http://dx.doi.org/10.11591/ijra.v6i4.pp277-285.

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<span>This paper utilizes the voltage source model of Unified Power Flow Controller (UPFC) and examines its abilities in mitigating the steady state stability margins of electric power system. It analyzes its behavior for different controls strategies and proposes the most efficient mode of controlling the controller for voltage stability enhancement. A systematic analytical methodology based on the concept of modal analysis of the modified load flow equations is employed to identify the area in a power system which is most prone voltage instability. Also to identify the most effective point of placement for the UPFC, a computer program has been developed using MATLAB. The results of analysis on 14 bus system is presented here as a case study.</span>
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Kobibi, Youcef Islam Djilani, Mohamed Abdeldjalil Djehaf, Mohamed Khatir, and Mohamed Ouadafraksou. "Continuation Power Flow Analysis of Power System Voltage Stability with Unified Power Flow Controller." Journal of Intelligent Systems and Control 1, no. 1 (October 30, 2022): 60–67. http://dx.doi.org/10.56578/jisc010106.

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The rising power demand has forced power systems all over the world to operate very close to their stability limits. When power systems are overloaded, faulty, or in lack of reactive power, voltage collapses would ensue. The capacity of a power system to keep the voltage of every bus constant under disturbances is called voltage stability. This dynamic phenomenon hinges on the load features. It is commonly known that flexible AC transmission systems (FACTS) can improve voltage stability. This paper puts forward a load flow model with the unified power flow controller (UPFC), and relies on the model to investigate the voltage stability of a power system through continuation power flow (CPF) method. The validity of the model was verified through a simulation, using the power system analysis toolbox (PSAT) in MATLAB/Simulink environment.
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