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1.
International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 121 APPLICATION OF NEURO-FUZZY CONTROLLER IN TORQUE RIPPLE MINIMIZATION OF VECTOR CONTROLLED VSI INDUCTION MOTOR DRIVE Pradeep B Jyoti†, J.Amarnath††, and D.Subbarayudu††† †Head of The Electrical Engineering Department, Shirdi Sai Engineering College, Bangalore, India ††Professor in Electrical Engineering Department, JNTU, Hyderabad, India †††Professor in Electrical Engineering Department, G. Pulla Reddy Engineering, Kurnool, India ABSTRACT This paper introduces Neuro-fuzzy based Torque controller for indirect vector controlled VSI fed induction motor drive. Compared to conventional PI controllers the proposed controller significantly reduces the torque ripple without the application of filter. The performance of the vector controlled induction motor drive has been simulated with and without loading conditions using the Neuro-fuzzy controller and the results are compared with PI controller. In addition to it, a SVPWM algorithm in which the calculation of switching times proportional to the instantaneous values of the reference phase voltages is used. Usage of SVPWM eliminates the need for calculation of sector and angle information. Keywords- Torque ripples minimization, indirect vector control, Neuro-Fuzzy controller, space vector modulation. I. INTRODUCTION The functionality of PI controllers is that it works best when tuned at particular operation point and it will not operate satisfactorily when the operating point changes. This drawback can be eliminated using optimized controller in the controlling part. The combination Neuro-fuzzy provides fuzzy logic and neural network which uses the neural network to tune a Fuzzy logic Sugeno type controller which possess the advantages of both fuzzy logic and neural network. INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY (IJEET) ISSN 0976 – 6545(Print) ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), pp. 121-127 © IAEME: www.iaeme.com/ijeet.asp Journal Impact Factor (2013): 5.5028 (Calculated by GISI) www.jifactor.com IJEET © I A E M E
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 122 An observer for estimating the rotor flux and the magnetizing current using Lyapunov stability theory and its effect on rotor flux has been discussed [1]. But, this developed control scheme performs well under steady state condition only. A filter based adaptive Neuro-fuzzy speed control coupled with flux regulation scheme of induction motor drive presented [2]. The reference flux is reduced in order to get minimum torque ripple,. The performance of PI controllers and fuzzy logic in indirect vector control method has been presented [3]. A fuzzy logic based indirect vector control for induction motor drive presented in [4]. In this, the fuzzy logic controllers gives better results compared to conventional PI controllers under the dynamic operating conditions. A hybrid PWM based space-vector and a triangle-comparison method has been presented [5]. A space vector modulation technique in-order to reduce the inverter output voltage distortion due to turn-off, turn-on and dead times of power modules, without increasing the harmonic content has been presented [6]. A relationship between space-vector modulation and carrier-based pulse-width modulation for multilevel inverter has been presented [7]. In this paper the error obtained from reference speed to that of the actual speed is fed to the ANFIS controller. Matlab/simulink software is used to develop a complete simulation model of indirect vector control with Nuero fuzzy controller. The induction motor performance using PI and Neuro-fuzzy controllers with and without loading conditions presented. The performance of proposed controller is compared with the conventional PI controller based induction motor drive. Simulation studies are carried out using 3-Phase, 1.3 hp, 400V, 50Hz, and 1480RPM induction machine and parameters are given in Appendix. II. MODELING OF INDIRECT VECTOR CONTROL From the mathematical model of a three-phase, squirrel-cage induction motor electromagnetic torque can be described as [8] ( )qrdsdrqme iiiiL P T − = 3 22 3 (1) Where ids, iqs, idr, iqr are d-q axis stator currents and d-q axis rotor currents respectively; Lm is mutual inductance respectively; P is the number of poles. In the indirect vector control rotor flux is aligned along the d-axis then the q-axis rotor flux ψqr=0. So the electrical torque of the machine can be expressed as qsdr T m e i L LP λ = 22 3 T (2) Thus torque is proportional to iqs, Lr is the self inductance By using the measures rotor speed ωr and slip speed ωsl the rotor angle θe is estimated in the indirect vector control ( ) slrslree dtdtw θθωωθ +=+== ∫ ∫ (3)
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 123 For decoupling control, stator flux component of current iqs should be aligned on d-axis and the torque component of current iqs should be aligned on qe axis. This leads to ψqr=0 and ψdr=ψr, then dsmr r r r iL dt D R L =+ψ ψ (4) The slip frequency can be calculated as dsr qsr qs rr rm sl iL in i L RL == ψ ω (5) III. ADAPTIVE NEURO-FUZZY CONTROLLER Figure 1 shows a five layered reference model of Neuro-fuzzy based controller .To generate torque the error between the reference speed ωr * and actual speed ωr is fed to the Neuro-fuzzy controller . The algorithm of Neuro-fuzzy controller is given by the equations (6) to (10). Figure 1. Structure of ANFIS Layer 1: let denote the output of node i in layer l, and xi is the ith input of the ANFIS, i = 1, 2,...,p., there is a node function A associated with every node. ( )ii y i XAY = (6) The role of the node functions A1, A2,..., Aq here is equal to that of the membership functions µ(x) used in the regular fuzzy systems, and q is the number of nodes for each input. The typical choice for membership functions are of Bell shape functions. We refer the premise parameters which are adjustable parameters that determine the positions and shapes of these node functions. Layer 2: The output of every node in layer 2 is the product of all the incoming signals. ( ) ( )JJ xANDAxAY 11 2 1 = (7)
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 124 Layer 3: Each node output represents the firing strength of the reasoning rule. In layer 3, each of these firing strengths of the rules is compared with the sum of all the firing strengths. Therefore, the normalized firing strengths are computed in this layer as 2 2 3 ii i i Y Y Y ∑ = (8) Layer 4 : It implements the Sugeno-type inference system, i.e., a linear combination of the input variables of ANFIS, x1,x2,...xp plus a constant term, c1,c2, ...,cp, form the output of each IF −THEN rule. The output of the node is a weighted sum of these intermediate outputs. jjj p jii CXOYY += ∑ 1 34 (9) Where parameters Q1,Q2, ...,Qp and c1,c2, ...,cp, in this layer are referred to as the consequent parameters. Layer 5: It produces the sum of its inputs, i.e., defuzzification process of fuzzy system (using weighted average method) is obtained. 45 iii YY ∑= (10) IV. SPACE VECTOR PULSE WIDTH MODULATION In the SVPWM algorithm, the d-axis and q-axis voltages are converted into three- phase instantaneous reference voltages. The imaginary switching time periods proportional to the instantaneous values of the reference phase voltages and can be defined as ** 3 * ,, BS dc BSYS dc s YRS dc s RS V V Ts TV V T TV V T T = = = (11) Where Ts and Vds are the sampling interval time and dc link voltage respectively. Here, sampling frequency is the twice the carrier frequency. Then the maximum (MAX), middle (MID) and minimum (MIN) imaginary switching times can be found in each sampling interval by using (10) - (12). )( ,,max BSYSRS TTTMAXT = (12) )( ,,min BSYSRS TTTMINT = (13) )( ,, BSYSRSmid TTTMIDT = (14)
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 125 The active voltage vector switching times T1 and T2 are calculated as min2max1 TTandTTTT midmid −=−= (15) The zero voltage vectors switching time is calculated as 21 TTTT sz −−− (16) The zero state time will be shared between two zero states as T0 for V0 and T7 for V7 respectively, and can be expressed as [5]. zoTKT =0 (17) ( )oKT −= 17 (18) In this SVPWM algorithm, the zero voltage vector time is distributed equally among V0 and V7. So, here k0 is taken as 0.5 to obtain the SVPWM algorithm. V. RESULTS AND DISCUSSION The reference value speed is considered as 1200rpm for Simulation results which are obtained under different operating conditions.The results obtained with the PI controlled and Neuro-fuzzy controlled drive is given in Figures 2-4. The performance of the drive during starting with PI and Neuro-fuzzy controller is shown Figure 2(a) and 2(b). The steady state phase response is shown in Figure 3(a) and 3(b). The response during the step change in load torque command (load torque of 8 N-m is applied at 0.6 sec and removed at 0.8 sec) are shown in Figure 4(a) and 4(b). It is observed that the ripple content in the current wave forms are less, the torque ripple reduced from a value 0.5 to 0.1 with Neuro-fuzzy controller. (a) With PI controller (b) With ANFIS controller Figure 2. Performance of induction motor during starting. (a) With PI controller (b) With ANFIS controller
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 126 (a)With PI controller (b) With ANFIS controller Figure 3. Performance of induction motor during steady state (a) With PI controller (b) With ANFIS controller (a)With PI controller (b) With ANFIS controller Figure 4. Performance of induction motor during step change in load torque (a) With PI controller (b) With ANFIS controller VI. CONCLUSION An indirect vector controlled induction motor drive is simulated with Neuro-fuzzy controller and conventional PI controller. The performance of vector controlled drive with Neuro-fuzzy torque controller is improved as compared to the conventional PI torque controller. vector controlled drive with Neuro-fuzzy torque controller reduces the current ripple, also reduces the maximum current during starting and interestingly torque ripple is reduced from 0.5 to 0.1 value. In large perspective the overall performance of a drive under different operating conditions is improved with Neuro-fuzzy controller compared to conventional PI controller.
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International Journal of
Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print), ISSN 0976 – 6553(Online) Volume 4, Issue 3, May - June (2013), © IAEME 127 APPENDIX Motor rating = 1.3hp Stator resistance Rs = 4.1ohm Stator inductance Ls=0.545H Rotor inductance Lr=0.542H Rotor resistance Rr = 2.5ohm Mutual inductance Lm=0.51H Moment of inertia J=0.04Kg-m2 . REFERENCE [1] Mohammad. Abdul Mannan, Toshiaki Murata, Junji Tamura,Takeshi Tsuchiya, “Indirect Field oriented control for high performance induction motor drives using space vector modulation with consideration of core loss”, in proc. IEEE 34th Annual conf. power electronics, pp.1449-1454 ,2003. [2] Hao Wen and M. Nasir Uddin, “Filter based torque ripple minimization of an adaptive Neuro-fuzzy controller for induction motor”, IEEE conf., Saskatoon, May 2005. [3] K. H. Chao and C. M. Liaw, “Fuzzy robust speed controller for detuned field-oriented induction motor drives”, in Proc. IEE Electrical Power Applications, vol. 147 no. 1, pp. 27 - 36 , Jan 2000. [4] Rajesh Kumar R. A. Gupta S.V. Bhangale, “Indirect vector controlled induction motor drive with fuzzy logic based intelligent controller”, IETECH Journal of electrical analysis, vol: 2, no: 4, pp.211 – 216, 2008. [5] Vladimir Blasko, “Analysis of a hybrid PWM based on modified space-vector and triangle-comparison methods” IEEE Trans. Ind. Applicat., vol. 33, no. 3, May/Jun 1997, pp. 756-764. [6] C.Attainese, V.Nardi, and G.Tomasso, “Space vector modulation algorithm for power losses and THD reduction in VSI based drives,” Electrical power components and systems, vol.35, pp.1271-1283, 2007. [7] Wenxi Yao, Haibing Hu, and Zhengyu Lu, “ Comparisons of space-vector modulation and carrier-based modulation of multilevel inverter,” IEEE Trans. Power. Electron., vol. 23, pp.45-51, Jan.2008. [8] Paull C. Krause,, Oleg Wasyyanczuk andd Scott D.Suudhoff, “Anaalysis of elecctrical machhinery and drive systemms”, IEEE prress. [9] K.Vijaya Bhaskar Reddy and G.V. Siva Krishna Rao, “Modeling and Simulation of Modified Sine Pwm VSI Fed Induction Motor Drive”, International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 2, 2012, pp. 343 - 351, ISSN Print : 0976-6545, ISSN Online: 0976-6553. [10] Pradeep B Jyoti, J.Amarnath and D.Subbarayudu, “The Scheme of Three-Level Inverters Based on Svpwm Overmodulation Technique for Vector Controlled Induction Motor Drives”, International Journal of Electrical Engineering & Technology (IJEET), Volume 4, Issue 2, 2013, pp. 245 - 260, ISSN Print: 0976-6545, ISSN Online: 0976-6553.
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