International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 04 | Apr 2026 www.irjet.net p-ISSN: 2395-0072
Power quality improvement by a shunt active power filter using PI and FUZZY logic controller
Abedhusen R. Moknojia1 , Harsh Sharma2
1P.G. Scholar, Hansaba college of engineering & technology, Siddhpur, Gujarat, India
2Assistant Professor, Dept. of Electrical Engineering, Hansaba college of engineering & technology, Siddhpur, Gujarat, India
Abstract - In this paper we use PI and FUZZY logic controllers forimprove thepower quality using shunt active power filter. And PWM patterns generations is based on carrier less hysteresis based current control to obtain the switching signals to the voltage sourced PWM converter. Make a simulation of shunt active power filter in MATLAB.
Key Words: Activeshuntpowerfilter,PIcontroller,FUZZY logic controller, Hysteresis current controller, Power Quality,Harmonics.
1.INTRODUCTION
Theapplicationofpowerelectronicsdevicessuchas are furnaces, adjustable speed devices, Computer power supply etc. are some typical non-linear characteristics loads used in most of the industrial applications and are increasing rapidly due to technicalimprovementsofsemiconductorsdevices, digital controller and flexibility in controlling the powerusage.Theuseoftheabovepowerelectronics devices in power distribution system gives rise to harmonicsandreactivepowerdisturbances.
TheHarmonicsandreactivepowercauseanumberof undesirableeffectslikeheating,equipmentdamage andElectromagneticInterferenceeffectsinthepower system. The conventional method to mitigate the harmonics and reactive power compensation is by using passive LC filters but this method has drawbacks like large size, resonance problem and fixed compensation behaviour. The solution of this problemistheactivepowerfilter(APF)comesinto the picture, which gives promising solution to compensate for the above adverse effects of harmonics and reactive power simultaneously by usingsuitablecontrolalgorithms.
This report contains issues related with electrical systemaboutpowerqualityandavailablesolutionsto mitigatethoseissues.
1.1 Power Quality Issue
The PQ issue is defined as "any occurrence manifested in voltage, current, or frequency deviations that results in damage, upset, failure, or misprision of end-use equipment. Almost all PQ issues are closely related with PE in almost every aspect of commercial, domestic, and industrial application.Equipmentusingpowerelectronicdevise areresidentialapplianceslikeTVs,PCsetc.business and office equipment like copiers, printers etc. industrial equipment like programmable logic controllers (PLCs), adjustable speed drives (ASDs), rectifiers, inverters, CNC tools and so on [5]. The Power Quality (PQ) problem can be detected from oneofthefollowingseveralsymptomsdependingon thetypeofissueinvolved.
• Lampflicker
• Frequentblackouts
• Sensitive-equipmentfrequentdropouts
• Voltagetogroundinunexpected
• Communicationsinterference
• Overheatedelementsandequipment
1.2 Solution of Power Quality Problem
Therearetwoapproachestothemitigationofpower quality problems. The first approach is called load conditioning, which ensures that the equipment is madelesssensitivetopowerdisturbances,allowing the operation even under significant voltage distortion. The other solution is to install lineconditioningsystemsthatsuppressorcounteractthe powersystemdisturbances.Passivefiltershavebeen most commonly used to limit the flow of harmonic currents in distribution systems. They are usually customdesignedfortheapplication.However,their performanceislimitedtoafewharmonics,andthey canintroduceresonanceinthepowersystem.Among the different new technical options available to
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 04 | Apr 2026 www.irjet.net p-ISSN: 2395-0072
improve power quality, active power filters have provedtobeanimportantandflexiblealternativeto compensateforcurrentandvoltagedisturbancesin powerdistributionsystems.Theideaofactivefilters isrelativelyold,buttheirpracticaldevelopmentwas madepossiblewiththenewimprovementsinpower electronicsandmicrocomputercontrolstrategiesas wellaswithcostreductioninelectroniccomponents. Activepowerfiltersarebecomingaviablealternative to passive filters and are gaining market share speedilyastheircostbecomescompetitivewiththe passivevariety.Throughpowerelectronics,theactive filter introduces current or voltage components, which cancel the harmonic components of the nonlinearloadsorsupplylines,respectively.Different activepowerfilterstopologieshavebeenintroduced andmanyofthemarealreadyavailableinthemarket.
2. PI CONTROL SCHEME
Fig-1. Schematicdiagramofshuntactivefilter.
Table -1: SampleTableformat
System Parameters Values
Sourcevoltage(Vs) 415(peak)
Systemfrequency(f) 50Hz
Sourceimpedance(Ls) 0.15mH
Filterimpedance(Rc,Lc) 0.4Ω,3mH
Loadimpedance(RlL) 6.7Ω,20mH
DClinkcapacitance 2000µF
ReferenceDClinkvoltage(V dcref) 600V
2.1. Fuzzy Control Scheme
2. ControlBlockofSAPFUsingFUZZY Controller
2.2 Comparisons Between Pi and Fuzzy Controller
Table 2 SimulationParameter
3.
CONCLUSIONS
ThispaperhaspresentedasimulationstudyofPIand FUZZY logic-based hysteresis current controlled activeshuntpowerfilterforharmoniccompensation ofthenon-linearload.UsingPIcontroller,thesource currentTHDisreduce26.92%2.39%.UsingFUZZY logic controller, the current source THD is reduce 26.92%to1.89%.Itisfoundfromsimulationresults thatshuntactivepowerfilterimprovespowerquality ofthepowersystembyeliminatingharmonicsofthe source current, which makes the source current sinusoidalandinphasewiththesourcevoltage.
ACKNOWLEDGEMENT
Iamgladtooffermysincerestgratitudeandrespecttomy supervisor,Prof.Harshsharma,forhisguidancefromthe foundationstageofthisresearchtotheentiredissertation work. I truly appreciate his esteemed guidance and encouragement throughout the work. I consider myself extremely fortunate to have had the opportunity of associatingmyselfwithhim.
Fig-
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 04 | Apr 2026 www.irjet.net p-ISSN: 2395-0072
REFERENCES
[1] D.F.Z.Peng,H.Akagi,andA.Nabae."Studyofactive power filtersusing quad seriesvoltage source PWM converters for harmonic compensation," IEEETransactions on PowerElectronics,vol.5, no. 1, Jan. 1990.pp.9-15.
[2] W.M.Grady,M.J.Samotyj,andA.H.Noyola,"Surveyof activepowerlineconditioningmethodologies,"IEEE TransactionsonPowerDelivery,vol.5,no.3.Jul.1990, pp.1536-1542
[3] S. K. Jain, P. Agrawal, and H. O. Gupta, "Fuzzy logiccontrolledshuntactivepowerfilterforpowerquality improvement," Proceedings of Institute of Electrical Engineers,ElectricalPowerApplications,vol.149,no. 5
[4] J.W.Dixon,J.J.Garcia&L.Morgan."Controlsystemfor threephaseactivepowerfilterwhichsimultaneously compensates power factor and unbalanced loads," IEEE Transactions on Industrial Electronics, vol.42, no.6,1995,pp636-641