International Journal of Emerging Trends in Science and Technology Power Factor Correction Using Sepic Converter Based On Fuzzy Logic Controller For Bldc Motor Janat ul Ferdoez 1, Dr. C. Venkatesan 2, D. Saravanan 3 PG Scholar Arasu Engg. College,Kumbakonam,Email:jferdoez@gmail.com Associate prof. Head of Dept. Arasu Engg. College kumbakonam, Email:venkatchakkaravarthy@gmail.com Asst.Professor Arasu Engg. College, Kumbakonam,Email:mainframesaravanan@gmail.com ABSTRACT This paper manages power factor correction using sepic converter with ZSI (Impedance source impedance) for brushless dc Motor (BLDC) drive. BLDC rate is controlled by fluctuating the dc-link voltage of a ZSI. It utilizes a low switching frequency of ZSI to minimize switching losses. A diode bridge rectifier along with the sepic converter based on fuzzy logic controller used to control the dc-link voltage remembering the deciding objective to keep up a unity power factor at ac mains. This will be more reasonable for low power applications. The proposed system execution is reproduced in a matlab/simulink environment. Looked at the execution of the Power factor and the Total harmonic distortion of the input current for both the Fuzzy and the PI controller of SEPIC and the CUK converter Keywords: Brushless dc (BLDC) motor, Fuzzy logic controller, Sepic converter, Power factor correction (PFC) 1. INTRODUCTION A permanent magnet brushless DC motor BLDCM is a sort of three-stage synchronous motor viewed as a rugged and effective machine for assortment of uses. For the most part, the PMBLDCMs are powered from single-stage AC mains through a diode bridge rectifier (DBR) with smoothening DC capacitor and a three-stage voltage source inverter (VSI). Because of the uncontrolled charging of DC link capacitor, the AC mains current waveform is a pulsed waveform highlighting a crest quality higher than the peak of the fundamental input current. This is because of the way that, the DBR does not draw any current from the AC mains when the AC voltage is not exactly the DC link voltage, as the diodes are reversed biased at that period; notwithstanding, it draws a substantial current when the AC voltage is higher than the DC link voltage. In this way, Power quality (PQ) issues emerge at input AC mains including poor Power Factor, raising Total Harmonic distortion (THD) and high Crest factor (CF) of AC mains current and so on. These PQ issues turn out to be more extreme for the utility when numerous such drives are utilized all the while at different spots. In this manner, the drive System having intrinsic Power factor correction (PFC) are more sought after and PFC converters have gotten to be favoured component of new drives. Since the PMBLDCM drives must be worked from the utility supply, in this way they ought to adjust to the global PQ standards. To agree to the PQ measures in the low power extend, the Power factor correction (PFC) converter topology utilizing active wave forming procedures is a well-known and favoured arrangement in domestic applications. The PFC converter powers the drive to draw sinusoidal AC mains current in stage with its voltage. In addition, for PFC converter fed PMBLDCM drives, the extra cost and Complexity nature of the PFC converter are not supported, in this way, converter topologies with characteristic component of PFC are favoured in these drives. Along these lines, a DC-DC converter topology is for the most part favoured amongst a few accessible topologies PWM switching of VSI. It has high switching losses. These has high number of Active and Passive portions included. Wu et al. have proposed a fell buck boost converter-nourished BLDC engine drive, it uses two switches for PFC operation. This offers high switching losses in the front-end converter because of two switch operation and lessens the productivity of the general framework In this Project Sepic converter with Power Factor Correction in view of Fuzzy Logic controller is utilized to enhances the Power Factor Janat ul Ferdoez www.ijetst.in Page 461
and diminished the Total Harmonic Distortion at the ac input current. 2.PROPOSED SYSTEM Fig. 1 shows to the Power Factor Correction SEPIC converter based ZSI fed BLDC Motor. The single stage ac is changed over into dc, the diode bridge rectifier which will change over the alternating current into Pulsing Direct Current. By using a LC channel, it can change over Pulsating dc into unadulterated dc. By using the SEPIC converter the adequacy of the output can be extended or decreased. In the Sepic converter a high Switching MOSFET is used for Power component remedies and voltage control. While Integrated Bipolar transistors (IGBT) are used as a part of the ZSI for its low frequency operation. 2 inductors and 2 capacitors. The Z-source system is go about as a energy storage and filtering components for the Z source inverter. It gives a second order filter and is demonstrated more possible to minimize the voltage and current swells than the capacitor and in addition an inductor alone. Subsequently, the inductor and capacitor worth will be tinier when stood out from the routine inverters. In the proposed model of Z source inverter, it uses four switches which lessens the cost of the drive. In the proposed model of Z source inverter, it uses four switches which lessens the cost of the drive. Fig 2. The impedance source inverter Fig. 1 Block diagram of the PFC using Sepic converter using the ZSI The BLDC Motor is commutated electronically to work the IGBTs of ZSI in Fundamental frequency changing mode to reduction its exchanging losses. The SEPIC converter sustained BLDC Motor drive in as per the triggered pulse connected to the MOSFET switch by the PWM Generator. A two port system that involves a two inductor and two capacitors that are related fit as a x formed is used in order to give an impedance source (Z-source) coordinating the inverter to the dc source. The Z-source framework is containing Here the Z source inverter is used as both reversal and boosting. This uses the inductor and capacitors, the shoot through state of the inverters are adequate use by activating on the upper furthermore, bring down switches at the same stage legs, to help dc voltage without dc/dc converter. The inductor and capacitor can be ideally outline to cut down the cost and size of the structure. Ensuing to the Z source inverter does not require dc-dc converter it can get 2-3% in change capability. As a consequence of no dead time, control precision and diminishment in harmonic can be expert. Right when the two inductors are little and approach to manage zero, the Z-source framework will be diminishing to two capacitors in parallel and structures a standard V-source Inverter. In this manner, capacitor essentials and physical size is the most negative situation need for the Z-source framework when go about as a Conventionally V- source Inverter. Considering the additional preferences gave by the inductors, for example, Janat ul Ferdoez www.ijetst.in Page 462
separating and Storage element, the Z-source Inverter needs less capacitance regard and smaller in size appeared differently in relation to the standard V-source inverter. So additionally, when the two capacitors are more diminished and approach zero, the Z source framework diminish in course of action and structures a standard I source inverters. Considering the filtering and energy storage limit capacitors, the Z source framework should require less inductance regard and tinier in size diverged from the standard I source inverter. 3.. INTRODUCTION TO FUZZY LOGIC CONTROLLER L. A. Zadeh exhibited the primary paper on Fuzzy set theory in 1965. From that point forward, another dialect was created to portray the fuzzy properties of reality, which are exceptionally troublesome and Sometime even difficult to be depicted utilizing traditional techniques. Fuzzy set theory has been broadly utilized as a part of the control region with some application to Sepic converter System. A straightforward fuzzy logic control is developed by a group of rules taking into account the human information of framework conduct. Matlab/Simulink reproduction model is worked to think about the dynamic conduct of SEPIC converter and execution of proposed controllers. Moreover, outline of Fuzzy Logic controller can give attractive both small signal and large signal element execution at same time, which is unrealistic with straight control procedure. Accordingly, Fuzzy logic controller has been potential capacity to enhance the robustness of converters. The fundamental plan of a Fuzzy logic controller is appeared in Figure 3. Fuzzy Controllers do not require an exact mathematical model. Fig. 3 Fuzzy system Rather, they are outlined in light of general information of the plant. Fuzzy controllers are intended to adjust to differing working focuses. Fuzzy Logic Controller is intended to control the output of help dc-dc converter utilizing Mamdani style fuzzy derivation framework. Two information variables, error (e) and change of error (de) are utilized as a part of this Fuzzy Logic framework. The single output variable (u) is obligation increase sign of the converter. Fig 4. Error (e) Fig 5. change in Error Fig 6. Output variable (u) The Membership functions for error (e), change in error(de), output(u) Fuzzy Logic Rules The goal of this dissertation is to control the output voltage of the Sepic converter. The error and change of error (de) of the output voltage will be the inputs of fuzzy logic controller. These 2 inputs are separated into five gatherings; NB: Negative Big, NS: Negative Medium, ZO: Zero Area and PM: Positive Medium, PB: Positive Big and its parameter. These fuzzy control rules for error (e) and change of error (de) can be alluded in the table 1 is appeared below: Janat ul Ferdoez www.ijetst.in Page 463
Fig 8 THD value in Cuk PI Table 1 fuzzy rules Fig. 9 The input voltage waveform 4.MATLAB SIMULATION AND RESULTS Here the simulation is carried out by four cases 3. A Proposed Cuk Converter using Conventional PI Controller. 4. A Proposed Cuk Converter using fuzzy logic Controller. 3.A Proposed SEPIC converter using Conventional PI controller. 4. A Proposed SEPIC converter using fuzzy logic Controller Case 1: A Proposed cuk converter using Conventional PI controller Fig. 10 The input current waveform Fig. 11 The speed of the BLDC motor in RPM Case 2: A Proposed cuk converter using Fuzzy Logic Controller Fig.7 Cuk converter with PI controller Fig 12 Cuk converter with Fuzzy Logic Fig 13 THD value in CUK Fuzzy Janat ul Ferdoez www.ijetst.in Page 464
Fig. 14 The input voltage waveform Fig. 19 The input voltage waveform Fig. 15 The input Current waveform Fig. 20 The input Current waveform Fig. 16 The speed of the BLDC motor in RPM Case 3: A Proposed Sepic converter using Conventional PI controller Fig. 21 The speed of the BLDC motor in RPM Case 4: A Proposed Sepic converter using Fuzzy Logic Controller Fig 17 Sepic Converter with PI Fig.22 Sepic Converter with Fuzzy logic Fig 18 THD value in Sepic PI Fig.23 THD Value in Sepic Fuzzy Janat ul Ferdoez www.ijetst.in Page 465
no dead time on account of shoot through state it diminishes the Complexity and harmonics. Fig.24 The input voltage waveform Fig.25 The input voltage waveform Fig. 26 The speed in RPM SEPI C Powerfa ctor THD % CUK Powerfa ctor THD % PI 0.949 2.92 PI 0.9997 2.64 FUZ ZY 0.9997 0.48 FUZ ZY 0.9998 0.31 Table 2. Comparison between SEPIC and CUK Converter 5. CONCLUSION The Power Factor Correction using impedance source inverter for BLDC Motor is proposed and Simulated Using Mat lab. A Sepic converter for impedance source energized BLDC Motor drive based on fuzzy logic controller has been proposed for finishing a Unity Power Factor at ac mains and great diminishment in the Total Harmonic Distortion. In the similar studies between the cuk and the Sepic converter with PI and Fuzzy logic controller, it is demonstrated that the Cuk converter with fuzzy Logic gives a Better Power Factor Correction and additionally amazing diminishment altogether Total Harmonic distortion at the input current. It redesigns the advancement of the negligible effort power variable amendment Motor for different lowpower equipment's such fans, blowers, water pumps, etc. The BLDC Motor drive speed has been controlled by moving the dc-link voltage of ZSI, which allows the ZSI to work in the fundamental switching frequency. The Impedance source inverter involve four Switching device as opposed to six which reduce the Switching stress and likewise the Switching losses. As the ZSI as 6. REFERENCES [1] J. F. Gieras and M.Wing, Permanent Magnet Motor Technology Design and Application. New York, NY, USA: Marcel Dekker, Inc, 2002. [2] C. L. Xia, Permanent Magnet Brushless DC Motor Drives and Controls. Beijing, China: Wiley, 2012. [3] Y. Chen, C. Chiu, Y. Jhang, Z. Tang, and R. Liang, A driver for the singlephase brushlessdcfan motorwith hybrid winding structure, IEEE Trans. Ind. Electron., vol. 60, no. 10, pp. 4369 4375, Oct. 2013. [4] S. Nikam, V. Rallabandi, and B. Fernandes, A high torque density permanent magnet free motor for in-wheel electric vehicle application, IEEE Trans. Ind. Appl., vol. 48, no. 6, pp. 2287 2295, Nov./Dec. 2012. [5] X. Huang, A. Goodman, C. Gerada, Y. Fang, and Q. Lu, A single sided matrix converter drive for a brushlessdcmotor in aerospace applications, IEEE Trans. Ind. Electron., vol. 59, no. 9, pp. 3542 3552, Sep. 2012. [6] T. Kenjo and S. Nagamori, Permanent Magnet Brushless DC Motors.Oxford, U.K.: Clarendon Press, 1985. [7] Pradeep Kumar and, Shankar Ganasan simulation & design of power factor correction prototype for bldc motor control, ieee trans. power electron.,vol. 4, no. 3, pp. 319 330, jul. 2009 [8] Vashist Bist and Bhim Singh Pfc Using Cuk Converter for Bldc Motor, Student Member, Ieee, And Bhim Singh, Fellow, IEEE Transactions On Power Electronics, Vol. 30, No. 2, February 2015 [9] V. Bist and B. Singh, A reduced sensor PFC BL-zeta converter based VSI fed BLDC motor drive, Elect. Power Syst. Res., vol. 98, pp. 11 18, May 2013. [10] K. M. Smedley and S. Cuk, Dynamics of one-cycle controlled Cuk converters, IEEE Janat ul Ferdoez www.ijetst.in Page 466
Trans. Power Electron., vol. 10, no. 6, pp. 634 639, Nov. 1995. Author Profile JANAT UL FERDOEZ received his B. Tech in Electronics and Communication Engg. at DBRAIT. Current he is doing M.E degree in Power Electronics and Drives at ARASU ENGG COLLEGE from Anna University. His area of interest includes Power Electronics, Digital Electronics. Dr. C. VENKATESAN obtained his Ph.D. in Anna university from Chennai. he is currently working as Professor and Head of Department in Electrical and Electronics Engineering Department of Arasu Engg. College /Kumbakonam / India. He has been working in the teaching field for about 10 Years. His areas of interest include optimization, Deregulation, Smart grid, Renewable energy source. D.Saravanan obtained his M.E Degree in Power Electronics and Drives from Periyar Maniammai. he is currently working as an Assistant Professor in Electrical and Electronics Engineering Department of Arasu Engg. College /Kumbakonam / India. He has been working in the teaching field for about 6 Years. His areas of interest include Power electronics. Janat ul Ferdoez www.ijetst.in Page 467