A strategic wind form integration method to polluted distibuted system with shunt capacitor 2-3

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A strategic wind form integration method to polluted distibuted system with shunt capacitor 2-3

  1. 1. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME147A STRATEGIC WIND FORM INTEGRATION METHOD TOPOLLUTED DISTIBUTED SYSTEM WITH SHUNT CAPACITORNagaRaju. Annam,Senior Asst professor, H.O.D, Department of E.E.E,Aryabhata Inst of Technology and Sciences,Dr. J. Bhagwan ReddyProfessor, Department of E.E.E, Astra, HydDr. Sardar AliProfessor, H.O.D, Department of E.E.E,Royal Institute of Technology and ScienceABSTRACRenewable energy is reliable and plentiful and will potentially be very cheap once technologyand infrastructure improve. It includes solar, wind, geothermal, hydropower and tidal energy, plusbiofuels that are grown and harvested without fossil fuels. Nonrenewable energy, such as coal andpetroleum, require costly explorations and potentially dangerous mining and drilling, and they willbecome more expensive as supplies dwindle and demand increases. Renewable energy produces onlyminute levels of carbon emissions and therefore helps combat climate change caused by fossil fuelusage. Now Distributed Generation plays a vital role to face the issues such as increased fossil fuelcosts, various technical and environmental problems, system reliability and energy security. The DGsupply local and distributed loads and reduces the amount of energy lost in transmitting electricitybecause the electricity is generated very near where it is used. The number of DG units is increasingrapidly in present distributed generation grids. Integration of newer DG units in to the distribution gridleads to planning as well as operational challenges. Due to the presence of non linear loads the systembecomes highly polluted which leads to complicated integration. This paper discusses the importantissue which deals with the problems and difficulties when integrating wind power plants in to theelectrical power system. In this paper shunt compensator is implemented to achieve reliable, efficientand unity power factor operation at point of connection when wind form is integrated to polluteddistributed system and simulation results are presented.Index Terms: Wind Form Integration, Polluted Distributed System, Distributed Generation (DG),Current Harmonics, Shunt CompensatorINTERNATIONAL JOURNAL OF ADVANCED RESEARCH INENGINEERING AND TECHNOLOGY (IJARET)ISSN 0976 - 6480 (Print)ISSN 0976 - 6499 (Online)Volume 4, Issue 3, April 2013, pp. 147-157© IAEME: www.iaeme.com/ijaret.aspJournal Impact Factor (2013): 5.8376 (Calculated by GISI)www.jifactor.comIJARET© I A E M E
  2. 2. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME148I. INTRODUCTIONThe need for alternative energy sources is getting urgent, hence the development of renewableenergy is moving fast. Nationally and internationally various individuals and research companies arecreating new and exciting energy systems. Some of these apparatus are great works and need improvingfor massive use. The first problem is that the fossil fuels are depleting in a rapid rate and are harder toretrieve. The consequence is that we can be facing an energy crisis in the future is we are not carefultoday. The energy prices will sky rocket and not be available for many individuals or countries. Toavoid this doom scenario we need to find alternatives and used them to their full potential. Luckily thisis already happening.At present Distributed Generation has become the only alternative for globalenergy sector to face the challenges such as continuously increasing costs of fossil fuels , manytechnical and environmental issues,power system reliability and future energy security increase.Distributed Generation, (DG), is a term to describe in most cases small, renewable fuel(s)generators intergrated into the nationwide electrical distribution grid Distributed Generation. DG refersto the power generation at the point of consumption. Generating power onsite rather than centrally,eliminates the cost, complexicity, interdependencies, and inefficiencies associated with transmissionand distribution.Fig. 1Integrated Renewable distributed generation systemOut of the renewable energy resources like Wind, Biomass, Solar PV, Geothermal etc., wind is one ofthe most renewable resources found in nature available free of cost with zero hazardous effects.Harnessing power from wind through wind farms is given greater attention around the globe as it is oneof the most mature technologies among all the renewable resources [1].By the end of 2011, of the totalrenewable power capacity, 238 GW, across the world 61.1% of the renewable power is through Windenergy [2], [3]. Wind energy is a major source of power in over 70 countries across the world Fig. 1shows the increasing trend of the installed capacity of Global wind power cumulative capacity from1996 to 2011.Fig. 2 Wind power total world capacity 1996-2011
  3. 3. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME149During 2011, an estimated 40 GW of wind power capacity was put into operation, more than any otherrenewable technology, increasing global wind capacity by 20% to approximately 238 GW. Around 50countries added capacity during 2011; at least 68 countries have more than 10 MW of reported capacity,with 22 of these passing the 1 GW level; and the top 10 countries account for nearly 87% of totalcapacity. Over the period from end-2006 to end-2011, annual growth rates of cumulative wind powercapacity averaged 26%.Fig. 3 Average annual growth rates of renewable energyCapacity and Bio fuels production 2006-2011Large percentage of wind energy conversion systems around the world is employing SquirrelCage Induction Generators (SCIG). The operation of SCIG demands reactive power, usually providedfrom the grid and/or by shunt operated capacitor banks. Wind generation based DG units can operateindividually or in a micro-grid which is formed by the cluster of DG units connected to a DistributionNetwork to serve local and distributed loads.This strengthens the Distribution system and improves theservice reliability.II. HARMONICSThe advancements and ease of control of Power Electronic Devices made extensive usage ofsemiconductor technology in power industry [4]. This has led to deterioration of Power Quality in bothTransmission and Distribution systems.The presence of non linear loads injects harmonics into thepower system and is becoming a serious concern not only to the consumers but also to the utilitycausing problems such as overheating and destruction of electrical equipment, voltage qualitydegradation, mall functioning of meters etc.,[5].The distribution system feeds different kinds of linearand non linear loads. The non linear loads draw non-sinusoidal currents from ac mains and causereactive power burden and excessive neutral currents and are also responsible for lower efficiency andinterfere with neighboring communication networks [6] - [9].The power factor and efficiency can be improved by using capacitors and synchronouscondensers but they cannot eliminate harmonics. Passive Filters provided to be the solution forharmonic suppression, greater efficiency and power factor improvement in distribution systems.However, they have their own potentialities (more economical, maintenance free, zero short circuitcurrents compared to synchronous condensers) [10] and limitations (not suitable for changing systemconditions, mistuning, fixed compensation, large size instability and they may create new systemresonance) [5], [10].To overcome these problems, many authors have proposed many alternatives but AttractivePower Filters (APFs) proved to be a very effective alternative for suppression of harmonics.
  4. 4. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME150Shunt Active Power Filter (ShAPF) proves to be an attractive solution for reactive power compensationand suppression of current harmonics [5] and Series Active Power Filter (SeAPF) for suppression ofvoltage harmonics [6].This paper emphasizes on suppression of current harmonics using shunt compensator. ShuntCompensator supplies harmonic current of same magnitude but opposite in phase of the currentharmonics due to non-linear load. The main task in this compensator is the computation of referencecurrent signal and generation of gate signals for Voltage SourceInverter (VSI). So many methods have been proposed by various authors for harmonic elimination [11]- [14]. But, the mathematical model and the control scheme given in [15] aresimple and easy to implement. The control schemes used for the generation of gate signals for PWMinverter are compared and reported in [15], [16] and the Fuzzy Logic controller is found superiorcompared to the conventional PI controller.The Fuzzy Logic (FL) is closer in spirit to human thinking and natural language thanconventional logical systems. This provides a means of converting a linguistic control strategy based onexpert knowledge into an automatic control strategy. The ability of fuzzy logic to handle imprecise andinconsistent real-world data made it suitable for a wide variety of applications [17]. In particular, themethodology of the fuzzy logic controller (FLC) appears very useful when processes are too complexfor analysis or when the available sources of information are interpreted qualitatively, inexactly or withcertain uncertainty. Thus FLC may be viewed as a step towards a rapprochement between conventionalprecise mathematical control and human-like decision making.III. SYSTEM MODELINGThe single line diagram of the power system under consideration is shown in Fig. 4The network consists of a 33KV, 50 Hz, grid supply point, feeding a 33KV distribution system.Thereare four load centers in the system L1, L2, L3 and L4. The four load centers comprise of Linear andNon-Linear loads. The Wind farm comprises of 4 wind turbines using squirrel cage inductiongenerators each rated 1.5MW, 690V, 50Hz. Each generator is provided 170 KVAr fixed reactive powercompensation through a bank of capacitors to give necessary reactive power support at the time ofstarting. The total wind farm capacity 6MW is connected to the 33KV distribution system at MV7,Point of Common Coupling (PCC), through a 690V/33KV transformer. In this study a mean wind speedof 12 m/s is considered. The Squirrel Cage Induction Generator model available in Matlab / SimulinkSimPowerSystem libraries is used.Fig. 4 one-line diagram of distribution system with wind farm integrated at PCCIV.PROPOSED COMPENSATION SCHEMEIn many cases, the power system design criterion is based on the current and its waveform.Hence, it is necessary that the rms value of the total current (current harmonics) be reduced as much aspossible. This not only reduces the losses but also reduces the distortion in voltage at the point ofconnection. Fig. 5 shows the basic compensation scheme of compensator to make the source current
  5. 5. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME151free from harmonics and in phase with source voltage by drawing or supplying a filter current ic from orto the utility at point of connection.Fig. 5 Shunt Compensator basic compensation schemeIV.A. Mathematical FormulationThe peak value of reference source current is calculated by regulating voltage across capacitorof the VSI. Source supplies two current components i. active and ii. loss (to meet losses in the VSI). Thecontroller used in the VSI is supposed to generate the gating signals to maintain the required value ofactive current component by maintaining the DC voltage constant.The source voltage and source current are given byvs (t ) Vsm sin ωt (1)is (t ) Ism sin ωt (2)Where Vsm and Ism peak values of source voltage and current respectivelyAs per Fig. 5, the load, source and compensator currents are related asis (t ) iL (t ) - iC (t ) (3)∞iL (t ) ∑I n sin(nωt  φn )n 1∞I1 sin(ωt  φf )  ∑I n sin(nωt  φn )n 2iLf (t )  iLh (t ) (4)Where iLf and iLh are the fundamental and harmonic components of load current. I1 and I n arethe peak values of fundamental and nthharmonic component of load currents respectively. Assumingthe voltage at load as vs (t ) , the instantaneous load power can be expressed asP Load (t ) vs (t ) * iL (t ) Vsm I1 sin 2ωt * cosφ f  Vsm I1 sin ωt * cosωt * sin φ f∞ Vsm sin ωt * ∑I n sin(nωt  φn )n 2p L (t ) q L (t ) p Lh (t ) (5)where p L (t ) , q L (t ) and p Lh (t ) are active, reactive and harmonic power of load. Out of these powers
  6. 6. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME152p L (t ) will be supplied by the source i.e.,pL (t ) Vsm ( I1 sin 2ωt ) ( cosφ f )= (Vsm sin ωt ).(I1 cosφ f ) sin ωtVs (t ) * is (t ) (6)From (2) and (6), the peak value of source current is given by I sm I1 cos φ fThere are also some switching losses in the PWM converter and, hence, the utility must supply a smalloverhead for the capacitor leakage and converter switching losses in addition to the real power to theload. The total peak current to be supplied by the source is thereforeI*smIsm I sl (7)The peak value of reference current I sm can be estimated by capacitor voltage. The ideal compensationrequires the source current to be sinusoidal and in-phase with the source voltage irrespective of thenature of load current. The desired source currents after compensation can be given asi*sa I*sm sin ωt, (8)i*sb I*sm sin(ωt − 120), (9)i*sc I*sm sin(ωt − 240) (10)Hence, the magnitude of the source currents needs to be determined by controlling the dc side capacitorvoltage.IV.B. Dc side CapacitorWhenever the load changes not only a real power imbalance gets established between sourceand load but also a reactive power and harmonic real power imbalance between active filter and theload. The real power imbalance has to be compensated by the DC capacitor. This drives the DCcapacitor voltage away from the reference value. For satisfactory operation of the compensator, thepeak value of the reference current must be regulated to change in proportion to the real power drawnfrom the source. This real power charged or discharged by the capacitor compensates for the real powerconsumed by the load. Whenever the capacitor recovers from its transient state to its reference voltage,the real power imbalance gets vanished. Also the reactive power required at the point of connection willbe compensated by the compensator.Thus the role of the DC side capacitor is (i) to absorb / supply real power demand of the loadduring transient period and (ii) maintain DC voltage in the steady state. The design of the DC sidecapacitor is based on the maximum possible variation in load and the required reduction in voltageripple [11].ANFIS ARCHITECTURESystem modeling based on conventional mathematical tools is not well suited for dealing withill-defined and uncertain systems. By contrast, a fuzzy inference system employing fuzzy ‘if-then’ rulescan model the qualitative aspects of human knowledge and reasoning processes without employingprecise quantitative analysis. However, even today, no standard methods exist for transforming humanknowledge or experience into the rule base and database of a fuzzy inference system. There is a need foreffective methods for tuning the membership functions so as to minimize the output error measure.Recently, ANFIS architecture has proved to be an effective tool for tuning the membership functions.
  7. 7. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME153Fig. 7 Sample ANFIS ArchitectureANFIS can serve as basis for constructing a set of fuzzy ‘if-then’ rules with appropriatemembership functions to generate the stipulated input-output pairs. An initial fuzzy inference system istaken from PI controller and is tuned with back propagation algorithm based on the collection ofinput-output data. The proposed control scheme is shown in Fig. 8. The system considered is a balancedthree-phase system with a wind farm integrated to the system at MV6 and compensator is connected atMV1 as shown in Fig. 2. The scheme of generation of reference currents for the generation of gatingsignals of PWM inverter is also illustrated in Fig. 5. The shunt compensator employs a diode clampedPWM inverter.Fig. 8 Shunt Compensator control schemeThe parameters for the ANFIS network used for the system under study are as detailed in Table 1.Table 1 Parameters used for ANFIS controllerThe rule base used for the TS-Fuzzy and ANFIS controller is shown in Table 2.
  8. 8. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME154Table 2 Rule base for Fuzzy & ANFIS controllersV. RESULTS & OBSERVATIONSThe power system with wind farm integrated to it at MV6 along with the shunt compensator isillustrated in Fig. 4. Simulations are carried out using Matlab/Simulink to study the impact of thecompensator on the operation of the system. The total simulation time considered is 0.5 Sec.Simulations are carried out to show that the filter eliminates the harmonics and also improves the powerfactor at the point of connection. The simulation was conducted with the following chronology:• at t = 0.0 sec, the simulation starts with shunt compensator not connected to the system• at t = 0.1 sec, the filter is turned ON• at t = 0.2 sec, the load is increased from 155 amps to 185 amps• at t = 0.3 sec, the load is decreased from 185 amps to 170 amps• at t = 0.4 sec, the load is increased from 170 amps to 185 ampsFig. 9 Load current in phase-aFig. 9 depicts the non-sinusoidal nature of current due to non-linear loads. These non-linear currentshave serious impact as detailed in section I.A, on the operation of electrical equipment being operated.As a result of this harmonic current the performance and life span of the induction generators beingoperated in wind farm integrated to distribution system beyond MV1 at the Point of Common Coupling(PCC), MV7, gets deteriorated.To protect the wind farm from the adverse effects due to harmonics, the shunt compensator isturned ON at t = 0.1 sec. The instant the filter is switched ON, the current becomes sinusoidal. Fig. 10illustrates the significance of compensator in making the current sinusoidalFig. 10 Current in phase-a at source (MV1)Comparison of Fig. 9 and Fig. 10 indicates that the current at MV1 continues to be sinusoidal after t =0.1 sec for any load condition. The harmonic content in current and power factor at different load
  9. 9. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME155conditions is listed in Table 3. The Total Harmonic Distortion (THD) in current without thecompensator is found as 31% and the power factor 0.7. Both are objectionable from the industrystandards point of view.The Distortion Power Factor (DPF) is calculated at five different instants and tabulated in Table3. The Distortion Power Factor describes how the harmonic distortion of load current decreases theaverage power transferred to the load. DPF is given byDPF= 1√1+THD2Table 3 THD and power factor for different load conditionsFig. 11 shows that the power factor at MV1 oscillates due to the starting of induction generators in windfarm and stabilizes finally to 0.7 at 0.015 sec. The power factor is low due to the reactive power drawnby the induction generators in the wind farm. The power factor 0.7 is a low value as per the IEEE-519[22] and IEC-61000 standards.Fig. 11 Power factor at MV1The compensator when turned ON not only generates harmonic power in such a way that itcancels the harmonic content in the current but also generates the reactive power needed at MV1. Thereactive power needed for wind farm operation is met from the compensator. Thus the power factor ismaintained unity by the compensator. For any load condition, the current is found to be sinusoidal andthe power factor is unity. The steady state and dynamic performance of the shunt compensator is foundsatisfactory. The compensator current increases with the increase in load and is illustrated in Fig. 12.The current will be in opposition to the harmonic current to make the source current sinusoidal andunity power factor operation at the point of connection.
  10. 10. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME156Fig. 12 Compensator currentThe instant compensator is switched ON the current becomes sinusoidal i.e., free fromharmonics and the power factor becomes unity. The improvement in the power factor from 0.7 to unitymeans that the filter supplies the required reactive power for the operation of induction generators in thewind farm. The performance of the proposed shunt compensator is much better in terms of THD andDPF.VI. CONCLUSIONThe role of shunt compensator for harmonic minimization and reactive power support for thewind farm is presented in this paper. The proposed compensator is found satisfactory for harmonicsmitigation meeting the IEEE-519 standards. The average power transferred to load is increased. Themitigation of harmonics reduces the unnecessary heating and increase the life span of inductiongenerators used in wind farm. Compensator is able to provide reactive power for the operation ofinduction generators in the wind farm, thus reducing the burden on the grid. The simulation results showthat the Shunt Compensator can be used for satisfactory integration of wind farm to the distributionsystem.REFERENCES[1] Xia Chen, Haishun Sun, Jinyu Wen, Wei-Jen Lee, Xufeng Yuan, Naihu Li, “Integrating WindFarm to the grid using Hybrid Multiterminal HVDC Technology”, IEEE Transactions on Industryapplications, Vol. 47, No. 2, March/April, 2011.[2] REN21: Renewables (2012) Global status Report.[3] “Annual market update 2011”, Global Wind Energy Council (GWEC), March, 2012.[4] Mohan N, Undeland T and Robbins W. P., “Power Electronics – Converters, Applications andDesign”, John Wiley and sons, 2003.[5] Juo, H. L., Wu, J. C., Chang, Y. J., and Feng, Y. T., “A novel active power filter for harmonicsuppression”, IEEE Trans. Power Delivery, Vol. 20, No. 2, pp. 1507 – 1513, April, 2005.[6] Juo, H. L., Wu, J. C., Chang, Y. J., Feng, Y. T., and Hsu, W. P., “New active power filter andcontrol method”, IEE Proc. Elect. Power Appl., Vol. 152, No. 2, pp. 175 – 181, March, 2006.[7] Cristian Lascu, Lucian Asiminoaei, Ion Boldea and Frede Blaabjerg, “High Performance CurrentController for selective Harmonic Compensation in Active Power Filters”, IEEE Trans. on PowerElectronics, Vol. 22, No. 5, pp. 1826-1835, September, 2007.[8] J. Arillaga, D. A. Bradley and P. S. Bodger, “Power System Harmonics”, 1stEdition, Wiley, NewYork, 1985.[9] An Luo, Zhikang Shuai, Wenji Zu, Ruixiang Fan and Chunming Tu, “Development of hybridactive power filter based on the adaptive fuzzy dividing frequency-control method”, IEEE Trans.on Power Delivery, Vol. 24, No. 1, January, 2009.[10] J. C. Das, “Passive Filters-Potentialities and Limitations”, IEEE Trans. on Industry Applications,Vol. 40, No. 1, pp. 232-241, Jan./Feb., 2004.[11] Jiang Zeng, Chang Yu, Qingru Qi, Zheng Yan, Yixin Ni, B. L. Zhang, Shousun Chen, Felix F.
  11. 11. International Journal of Advanced Research in Engineering and Technology (IJARET), ISSN 0976 –6480(Print), ISSN 0976 – 6499(Online) Volume 4, Issue 3, April (2013), © IAEME157Wu, “A novel hysterisis current control for active power filter with constant frequency”, ElectricPower System Research, Vol. 68, pp. 75 – 82, 2004.[12]GYU-HA CHOE and MIN-HO PARK, “A New Injection method for AC Harmonic Eliminationby Active Power Filter”, IEEE Trans. on Industrial Electronics, Vol. 35, No. 1, pp. 141-147,February, 1988.[13] Ambrish Chandra, Bhim Singh, B. N. Singh and Kamal Al-Haddad, “An Improved ControlAlgorithm of Shunt Active Filter for Voltage Regulation, Harmonic Elimination, Power-FactorCorrection and Balancing of Nonlinear Loads”, IEEE Trans. on Power Electronics, Vol. 15, No.3, pp. 495-507, May, 2000.[14] El-Habrouk .M, Darwish M. K. and Mehta .P, “Active Power Filters: A review”, IEE Proc. Electr.Power Appl., Vol. 147, No. 5, pp. 403 – 413, September, 2000.[15] C.N. Bhende, S. Mishra and S.K. Jain, “TS-Fuzzy-Controlled Active Power Filter for LoadCompensation”, IEEE Trans. on Power Delivery, vol. 21, No. 3, pp. 1459-1465, July, 2006.[16] Nitin Gupta, Singh S. P. and Dubey S. P., “Fuzzy logic controlled shunt active power filter forreactive power compensation and harmonic elimination”, IEEE Int. Conference on Computer andCommunication Technology (ICCCT), pp. 82 – 87, September, 2011.[17] Jhy-Shing Roger Jang, “ANFIS: Adaptive-Network-Based Fuzzy Inference System”, IEEETrans. on Systems, Man and Cybernetics, Vol. 23, No. 3, pp. 665-685, May/June, 1993.[18] Ying H, “Fuzzy control and modeling: Analytical foundations and Applications, IEEE Press,2000.[19] Vazquez J.R. and Salmeron P, “Active power filter control using neural network technologies”,IEE Proc. Electr. Power Appl., Vol. 150, No. 2, pp. 139 – 145, March, 2003.[20] Rukonuzzaman M and Nakaoka M, “An advanced active power filter with adaptive neuralnetwork based harmonic detection scheme”, IEEE Conference on Power Electronics SpecialistsConference (PESC), Vol. 3, pp. 1602 – 1607, 2001.[21] Nitin Gupta, Singh S. P. and Dubey S. P., “Neural network based shunt active filter for harmonicand reactive power compensation under non-ideal mains voltage”, IEEE International Conferenceon Industrial electronics and applications (ICIEA), pp. 370 – 375, June, 2010.[22] “IEEE Recommended Practices and Requirements for Harmonic Control in Electrical PowerSystems”, ANSI/IEEE Std. 519 – 1992, New York, 1993[23] Dr. Leena G, Bharti Thakur, Vinod Kumar And Aasha Chauhan, “Fuzzy Controller Based CurrentHarmonics Suppression Using Shunt Active Filter With Pwm Technique” International JournalOf Electrical Engineering & Technology (IJEET) Volume 4, Issue 1, 2013, pp. 162 - 170, ISSNPRINT : 0976-6545, ISSN ONLINE : 0976-6553.[15] T. Nageswara Prasad , V. Chandra Jagan Mohan , Dr. V.C. Veera Reddy, “Shunt CompensatorFor Integration Of Wind Farm To Polluted Distribution System” International Journal OfElectrical Engineering & Technology (IJEET) Volume 3, Issue 3, 2012, pp. 89 - 101, ISSNPRINT : 0976-6545, ISSN ONLINE : 0976-6553.

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