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2. MITIGATION OF VOLTAGE SAG AND SWELL USING DPFC A abstract report on MASTER OF TECHNOLOGY IN ELECTRICAL POWER SYSTEM By B.Rupendra Naik (11121DO702) Under Esteemed Guidence of Dr. T. Devaraju, M.E., Ph.D., Professor & HOD Department of Electrical and Electronics Engineering SREE VIDYANIKETHAN ENGINEERING COLLEGE (An autonomous institute affiliated to JNTUA, Ananthapur) Sree Sainath Nagar, Tirupati – 517 102 2012-2013 2

3.  Collected Reference papers  Objective of the project  About Power Quality Problem  FACTS devices  Introduction to DPFC  DPFC Configuration 29/11/2012 3 Sree Vidyanikethan Engineering College

4. 1. S. Masoud Barakati, Arash Khoshkbar Sadigh and Ehsan Mokhtarpour, “Voltage Sag and Swell Compensation with DVR Based on Asymmetrical Cascade Multicell Converter”, North American Power Symposium (NAPS), pp.1 – 7, 201  In This paper, custom power devices, e.g., dynamic voltage restorer (DVR), are used in medium-to-low voltage levels to improve customer power quality. When ever we get high voltage level failures then it may be damaged 29/11/2012 4 Sree Vidyanikethan Engineering College

5. 2. Zhihui Yuan, Sjoerd W.H de Haan, Braham Frreira and Dalibor Cevoric “A FACTS Device: Distributed Power Flow Controller (DPFC)” IEEE Transaction on Power Electronics, vol.25, no.10, October 2010.  This paper introduces a new concept, called distributed power-flow controller (DPFC), that is derived from the UPFC. the DPFC is able to control all system parameters. The DPFC eliminates the common dc link between the shunt and series converters. The active power exchange between the shunt and the series converter is through the transmission line at the third-harmonic frequency. 29/11/2012 5 Sree Vidyanikethan Engineering College

6. 3. P. Ramesh and M. Damodara Reddy “CONTROL DESIGN AND SIMULATION OF DISTRIBUTED POWER-FLOW CONTROLLER (DPFC)” ARPN Journal of Engineering and Applied Sciences, VOL. 7, NO. 6, JUNE 2012  This paper describes The steady-state response and control of power in transmission line equipped with DPFC, This paper illustrate the control features of these devices and their influence to increase power transfer capability and improve system reliability. In DPFC The active power exchange between the shunt and series converters through the transmission lines at the third-harmonic frequency 29/11/2012 6 Sree Vidyanikethan Engineering College

7. 4. Priyanka P. Tambe, K. D. Joshi, “Power Flow Improvement Using Distributed Static Series Compensator” International Journal of Engineering Research & Technology (IJERT), Vol. 1 Issue 4, June – 2012  This paper introduces a new concept “Distributed Static Series Compensator “, (DSSC) is one of the DFACTS device, This paper discusses the concept of DSSC & ability of DSSC to increase power flow in a transmission line using PSIM software. In the DPFC the series converter employs the DSSC concept, 29/11/2012 7 Sree Vidyanikethan Engineering College

8. 5. M. A. Hannan and Azah Mohamed, Member, “PSCAD/EMTDC Simulation of Unified Series-Shunt Compensator for Power Quality Improvement” IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 20, NO. 2, APRIL 2005  This paper deals with the simulation of a unified series-shunt compensator (USSC) aimed at examining its capability in improving power quality in a power distribution systems. The USSC simulation model comprises of two 12-pulse inverters which are connected in series and in shunt to the system This paper results verify the capabilities of the USSC in performing voltage sag compensation, flicker reduction, voltage unbalance mitigation, UPS mode, power- flow control and harmonics elimination. A comparison of the USSC with other custom power devices shows that the USSC gives a better performance in power-quality mitigation 29/11/2012 8 Sree Vidyanikethan Engineering College

9. 6. P. P. Tambe & K. D. Joshi “ Distributed Static Series Compensator (DSSC) Application To Power System- A Review)” Department of Electrical Engineering, G.H.Raisoni College of Engineering, Nagpur, India This paper showcasing review of distributed static series compensator (DSSC)& explains the effect of insertion of DSSC in transmission line power flow control. FACTS ( Flexible AC Transmission System) technology the aspect of Power Electronics offers High speed & reliability of switching & thus the value of electric energy is enhance. Along with merits there are certain problems offered by FACTS technology which leads to complexity in operation & overall cost investment becomes large,The solution to this is DFACTS technology 29/11/2012 9 Sree Vidyanikethan Engineering College

10. 7. A. M. El Nady, A. Noureldin, Member, IEEE, and Yan-Fei Liu, Senior Member, “Power-Quality Improvement Using Wiener Filters Based On a Modular Compensating Strategy” IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 23, NO. 2, APRIL 2008  This paper introduces a new modeless modular compensating strategy to extract and mitigate power-quality (PQ) disturbances. The main advantage of this strategy is that it does not require any model or state-space formulation to extract the disturbances, such as the other commonly used state-space techniques it is very simple for practical implementation compared to the time-domain and frequency-domain methods 29/11/2012 10 Sree Vidyanikethan Engineering College

11. 8. Jovica V. Milanovic´, Fellow, IEEE, and Yan Zhang, “Modeling of FACTS Devices for Voltage Sag Mitigation Studies in Large Power Systems” IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 25, NO. 4, OCTOBER 2010  This paper introduces a new approach of quasistatic sag analysis using a system impedance (Z bus) matrix that incorporates FACTS devices. Three types of FACTS devices which are most often used in practical applications are considered in this study: static compensator, static var compensator, and the dynamic voltage restorer The case studies based on the 295-bus generic distribution system are used to illustrate the modeling method and the effectiveness of these devices in sag mitigation. 29/11/2012 11 Sree Vidyanikethan Engineering College

12. 9. Ahmet Teke, Lütfü Saribulut, and Mehmet Tümay, “A Novel Reference Signal Generation Method for Power-Quality Improvement of Unified Power-Quality Conditioner” IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 26, NO. 4, OCTOBER 2011  This paper proposes a novel reference signal generation method for the unified power quality conditioner (UPQC) adopted to compensate current and voltage-quality problems of sensitive loads The UPQC consists of a shunt and series converter having a common dc link. The shunt converter eliminates current harmonics originating from the nonlinear load side and the series converter mitigates voltage sag/swell originating from the supply side 29/11/2012 12 Sree Vidyanikethan Engineering College

13.  The aim of the project is to Mitigate The Voltage Sag and Swell using DPFC, with three different control schemes – 1. Central controller 2. Series Control 3. Shunt Control.  In DPFC, several single-phase series distributed converters connected to a transmission line. 29/11/2012 13 Sree Vidyanikethan Engineering College

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15.  Power quality is defined as the index which both the delivery and consumption of electric power affect on the performance of electrical apparatus.  From a customer point of view, a power quality problem can be defined as any problem is manifested on voltage, current, or frequency deviation that results in power failure 29/11/2012 15 Sree Vidyanikethan Engineering College

16.  The term "power quality" refers to the voltage stability, frequency stability, and the absence of various forms of electrical noise (e.g. flicker or harmonic distortion) on the electrical grid.  More broadly speaking, power companies (and their customers) prefer an alternating current with a nice sinusoidal shape. 29/11/2012 16 Sree Vidyanikethan Engineering College

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18.  Power flow control.  Increase in transmission capability.  Voltage control.  Reactive power compensation.  Stability improvement.  Power quality improvement.  Power conditioning.  Interconnection of renewable and distributed generation plants. 29/11/2012 18 Sree Vidyanikethan Engineering College

19.  The DPFC is a device which can control simultaneously all three parameters of line power flow  Such "new" FACTS device combines together the features of two "old" FACTS devices: 1. Shunt Converter 2. Series Converters.  These two devices are two Voltage Source Inverters (VSI’s) connected respectively in shunt with the transmission line through a shunt transformer and in series with the transmission line through a series transformer. 29/11/2012 19 Sree Vidyanikethan Engineering College

20.  The shunt inverter is used for voltage regulation at the point of connection injecting an opportune reactive power flow into the line and to balance the real power flow exchanged between the series inverter and the transmission line.  The series inverter can be used to control the real and reactive line power flow inserting an opportune voltage with controllable magnitude and phase in series with the transmission line. 29/11/2012 20 Sree Vidyanikethan Engineering College

21. Basic configuration of UPFC 29/11/2012 21 Sree Vidyanikethan Engineering College

22.  Here The case study contains a DPFC sited in a single- machine infinite bus power system including two parallel transmission lines, which simulated in MATLAB/Simulink environment. 29/11/2012 22 Sree Vidyanikethan Engineering College

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