Stability Improvement in Power Systems Using Unified Power Flow Controller (UPFC)

2013 ◽  
Vol 768 ◽  
pp. 392-397 ◽  
Author(s):  
B. Gopinath ◽  
S. Suresh Kumar ◽  
Juvan Michael
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Short Circuit ◽  
Electric Energy ◽  
System Response ◽  
Unified Power Flow Controller ◽  
Flow Controller ◽  
Ac Transmission ◽  
Power Flow Controller ◽  
Bus System

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.

scholarly journals Wavelet based performance analysis of AC transmission systems with unified power flow controller under power quality issues

2019 ◽  
Vol 8 (3) ◽  
pp. 299
Author(s):  
M. Nagaraju ◽  
V. V. K. Reddy ◽  
M. Sushama
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Research Work ◽  
Unified Power Flow Controller ◽  
New Device ◽  
Quality Issues ◽  
Flow Controller ◽  
Ac Transmission ◽  
Power Flow Controller

The developments in power quality are fast and difficult to predict. The majority of power quality issues experienced by industrial customers can be attributed to momentary interruptions, voltage sags or swells, transients, harmonic distortion, electrical noise, and flickering lights, among others. A new device may be invented tomorrow solving power quality problems. The FACTS devices could provide fast control of active and reactive power through a transmission line. The unified power-flow controller (UPFC) is a member of the FACTS family with very attractive features. This device can independently control many parameters, so it is the combination of the properties of a static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC).The performance of AC Transmission system with Unified power flow controller under various power quality problems analysis described. The proposed system is formulated and research work is done by wavelet multi resolution analysis using Bior1.5 mother wavelet with MATLAB/SIMULINK software. It is observed that the effectiveness of AC power transmission through Unified power flow controller under power quality problems of sag, swell, transient, temporary faults and capacitive switching.

scholarly journals EFFECT OF UPFC ON SYSTEM PERFORMANCE UNDER NORMAL AND FAULT CONDITION

2014 ◽  
pp. 182-185
Author(s):  
PRAKASH D B ◽  
SHANMUKHA SUNDAR K ◽  
MANJUNATHA BABU P ◽  
SHUBHA KULKARNI ◽  
RAMAMANI V
Keyword(s):  
System Performance ◽  
Power Flow ◽  
Reactive Power ◽  
Digital Simulation ◽  
Unified Power Flow Controller ◽  
Real Power ◽  
Matlab Simulink ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Bus System

This paper deals with the effect of Unified Power Flow Controller (UPFC) on the system performance under normal and fault conditions. Simulink models are developed for 7 bus system with and without UPFC. Digital simulation using MATLAB/SIMULINK is done with these models and the results are presented. The effect of UPFC on real power, reactive power and the voltage is also presented.

Effect of unified power flow controller installation in dual feed induction generator (DFIG) wind turbines

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asaad Shemshadi ◽  
Pourya Khorampour
Keyword(s):  
Power Flow ◽  
Wind Farm ◽  
Reactive Power ◽  
Wind Farms ◽  
Transient Behavior ◽  
Unified Power Flow Controller ◽  
Voltage Fluctuations ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Sudden Load

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.

scholarly journals Real and Reactive Power Control by using 48-pulse Series Connected Three-level NPC Converter for UPFC

2011 ◽  
pp. 1-5
Author(s):  
A. Naveena ◽  
M.Venkateswara Rao
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Reactive Power ◽  
System Stability ◽  
Unified Power Flow Controller ◽  
Control Mechanisms ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Flow Controller ◽  
Power Flow Controller

The equipments based on the power electronics have been improved under the name of Flexible Alternating Current Transmission Systems (FACTS) in the last years. Unified Power Flow Controller (UPFC) is the most widely used FACTS device to control the power flow and to optimize the system stability in the transmission line. UPFC is a FACTS devices that can control active and reactive power flow in transmission line by means of injection controllable series voltage to the transmission line. This paper proposes a new connection for a Unified Power Flow Controller (UPFC) to control the active and reactive power flow control in two sides of a transmission line independently and it regulates bus voltage in the same transmission line, furthermore it is possible to balance line current too. This connection of the UPFC will be called an center node UPFC (C_UPFC). It is one of the newest devices within the FACTS technology. The structure and capability of the C_UPFC is discussed and its control scheme is based on the d-q orthogonal coordinates. According to this, the performance of UPFC for several modes of operations using different control mechanisms based on Proportional-Integral (PI) and PID based controllers has been studied. The obtained simulation results from Matlab/simulink confirm the effective features.

scholarly journals Modelling of Transformerless Upfc Toimprovepower System Stability using Optimization Technique

2019 ◽  
Vol 8 (4) ◽  
pp. 11456-11459
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Optimization Technique ◽  
System Stability ◽  
Unified Power Flow Controller ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Facts Devices ◽  
Ac Transmission ◽  
Power Flow Controller

Generally, power system faces the problem to transfer power from one system to another system without any fluctuations, with minimal of system losses. To overcome this problems, a flexible ac transmission system is implemented in this paper. In present scenario, facts devices are used to reduce the transmission losses for improvising transmission capacity and also to improve the system capability. Unified Power Flow Controller plays a most prominent role in FACTS controller to improve the system stability. The structure of UPFC is combination of back-back converters with boosting and zigzag transformer. This type of UPFC system consists of high losses due to presence of magnetic properties in this transformer. With this, a transformer-less multilevel inverter based UPFC topology is proposed in this paper. This paper focuses on the modulation of transformerless UPFC with PSO, which controlsfundamental frequency for better controlling of active and reactive power, harmonic minimization, and improvement in efficiency of system by controlling DC link voltage

scholarly journals Transmission Capacity Improvement Using Unified Power Flow Controller with New Control Strategy

2021 ◽  
pp. 225-232
Author(s):  
Moe Moe Oo ◽  
◽  
Myint Thuzar
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Power Flow ◽  
Transmission Capacity ◽  
System Response ◽  
Unified Power Flow Controller ◽  
Transmission Network ◽  
Flow Controller ◽  
Power Flow Controller

This paper presents Unified Power Flow Controller (UPFC) with a new control strategy to improve the transmission capacity in power system network. With the growing demand of electricity, it is not possible to erect new lines to face the situation. Therefore UPFC is optimally utilizes to enhance the existing transmission network. A detail explanation of the controllers for both shunt and series converters of UPFC and DC link capacitor rating are presented in this study. To justify the performance of the UPFC model, 230kV transmission system in Upper Myanmar National Grid is considered as case study. The proposed control system performance is checked by applying different faults across a transmission line to which UPFC is connected. This is necessary because of the chance for occurance of fault is larger for this case study network. And, loading condition is changed to study the control system response. The simulation results show the effectiveness and suitable performance of the control strategy at improving transmission capacity. Transmission network model and all simulations have been done using MATLAB/Simulink software.

scholarly journals Unified Power Flow Controller for Non-Linear Loads Using Adaptive Power Quality Theory

2019 ◽  
Vol 9 (2) ◽  
pp. 61-67
Author(s):  
Jaya Raju Gaddala ◽  
Sambasiva Rao Gudapati
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Unified Power Flow Controller ◽  
Q Theory ◽  
Non Linear ◽  
Source Current ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Load Conditions

Harmonics reduction techniques in source current were found to be unreliable and imbalanced with different load conditions. This certain unreliability problem in harmonics mitigation is caused by non-linear loads. The harmonics and power quality problems are eliminated by filters. These filters are expensive to provide a dynamic response under various load conditions. The new unified power flow controller composed of a series and shunt compensator provides more secured power systems and good voltage stability at various load conditions. D-Q theory is used to generate the reference current from the AC source current. D-Q theory produces sinusoidal harmonics that are opposite to load harmonics. This UPFC can absorb or inject reactive power in the PCC. D-Q theory followed by a hysteresis current controller generates PWM pulses to the shunt and series compensator. The PI and fuzzy logic controllers preserve the DC link voltage in the storage capacitor. The proposed technique has been simulated by using Matlab simulation under different load conditions.

scholarly journals Voltage and Reactive Power Control in DFIG Wind Farm Load bus by FACT Device – UPFC

2021 ◽  
Vol 23 (12) ◽  
pp. 207-211
Author(s):  
DR . Dipesh. M .Patel ◽  
◽  
Prof. (Dr.) Karunesh Saxena ◽  
Keyword(s):  
Power Control ◽  
Power Flow ◽  
Wind Farm ◽  
Reactive Power ◽  
Unified Power Flow Controller ◽  
Reactive Power Control ◽  
Flow Controller ◽  
Doubly Fed ◽  
Farm System ◽  
Power Flow Controller

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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