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1 FUZZY SPEED CONTROLLER DESIGN OF THREE PHASE INDUCTION MOTOR Divya Rai 1,Swati Sharma 2, Vijay Bhuria 3 1,2 P.G.Student, 3 Assistant Professor Department of Electrical Engineering, Madhav institute of technology and science,gwalior. 1 divya_rai2007@rediffmail.com 2 Swatisharma.1987@yahoo.com 3 vijay_bhuria@yahoo.co.in Abstract The induction motor is without doubt the most used electrical motor because of its unique characteristics. Most of its applications need fast and intelligent speed control system.this paper presents an intelligent and advanced speed control based on fuzzy logic technique to achieve maximum torque and efficiency.a rule based Mamdani type fuzzy logic controller is applied to closed loop induction motor model.scalar control(volt-hertz) method is used for controlling speed.a conventional controller is compared practically to fuzzy logic controller using Matlab/Simulink software package.the simulation results show the superiority of the fuzzy logic controller. Keywords fuzzylogic, Inductionmotor, scalarcontrol, imulink, speed control. I. INTRODUCTION The induction motor is considered since its discovery as actuator privileged in the applications of constant speed, and it has many advantages, such as low cost, high efficiency, good self starting, its simplicity of design, the absence of the collector brooms system, and a small inertia. However, induction motor has disadvantages, such as complex, nonlinear, and multivariable of mathematical model of induction motor, and the induction motor is not inherently capable of providing variable speed operation.these limitations can be solved through the use of smart motor controllers and adjustable speed controllers [1]. Advanced control based on artificial intelligence technique is called intelligent control[2]. The fuzzy logic controller is the most efficient controller because of it s non-linearity handling features and it is independent of plant model. The technique to embody human-like thinking into a control system is fuzzy control. A fuzzy controller can be designed to emulate human deductive thinking, that is, the process people use to infer conclusions from their knowledge. Fuzzy control has been primarily applied to the control of processes through linguistic descriptions. Fuzzy logic control system consists of four blocks as shown in Figure 1.[2] 145 Figure1.Fuzzy control system II. DYNAMIC MODEL OF INDUCTION MOTOR [3] The dynamic modeling of Induction Motor is done in Simulink program of Matlab by utilizing its mathematical equations which are shown below. We have used synchronous frame of reference where:
2 As the controller generates the slip speed ωsl signal that is added with electrical speed that yields synchronous speed ωs that is used in induction motor model with synchronous reference frame and generate the voltage command through Volts/HZ function to keep flux constant.[4] Figure2.Block diagram of scalar control system B. Fuzzy-PI Controller The fuzzy controller is basically an input/ output static non-linear mapping, the controller action can be written in the form [ 6 ]: u = ke.e + k ce.ce The Fuzzy-PI output is: y = k p.u + k i.u Where ke is the gain of the speed error, kce is the gain of the change of speed error, kp is the proportional factor; ki is the integral factor, e is the speed error, ce is the change of speed error, u is the fuzzy output. III. PROPOSED CONTROL SYSTEM Due to poor dynamic performance in open-loop of induction motor, scalar control technique has been used in many applications to achieve high dynamic performance, get tracking speed, and generate maximum torque of induction motor. A. Scalar Control Scalar control as the name indicates, is due to magnitude variation of the control variables only, and disregards the coupling effect in the machine. Scalar control has been widely used in industry, the fact that they are easy to implement. The scalar control strategy is based on simplified volts/hertz control scheme with stator frequency regulation as shown in figure2. IV. Figure3.Fuzzy PI control FUZZY LOGIC CONTROLLER FLC approach is very useful for induction motor speed drives since no exact mathematical model of the induction motor or the closed-loop system is required. FLC has a fixed set of control rules, usually derived from expert s knowledge. 146
3 The membership function (MF) of the associated input and output linguistic variables is generally predefined on a common universe of discourse. For the successful design of FLC s proper selection of input and output scaling factors (gains) or tuning of the other controller parameters are crucial jobs, which in many cases are done through trial and error to achieve the best possible control performance[1]. The structure of FLC is shown in figure4. The structure shows four functions,each one materialized by block : A fuzzification interface, the fuzzy control initially converts the crisp error and its rate of change in displacement into fuzzy variables; then they are mapped into linguistic labels. Membership functions are defined within the normalized range (-1, 1), and associated with each label: NB (Negative Big), NS (Negative Small), ZE (Zero), PS (Positive Small), and PB (Positive Big). Five MFs are chosen for e(pu) and ce(pu) signals and five for output. All the MFs are symmetrical for positive and negative values of the variables. Thus, maximum 5х5 = 25 rules can be formed as tabulated in Table I. The gains G1, G2, and G3 are scaling factors to adapt the variables to the normalized scale. However, the inference strategy is the mamdani algorithm, so the if-then rules for fuzzy scalar control for speed control will be twenty five rules. (a) (b) Figure4. STRUCTURE OF FUZZY CONTROL A knowledge base (a set of If-Then rules), which contains the definition of the fuzzy subsets, their membership functions, their universe discourse and the whole of the rules of inference to achieve good control. An inference mechanism (also called an inference engine or fuzzy inference module), which is heart of a fuzzy control, poses the capacity to feign the human decisions and emulates the expert s decision making in interpreting and applying knowledge about how best to control the plant. A defuzzification interface, which converts the conclusions of the inference mechanism into actual inputs for the process. In this work; Center Of Area (COA) is used as a deffuzification method, which can be presented as: 147 (c) (d)
4 (e) Figure5. (a,b)inputs membership function, (c)output membership function, (d) Rules view (e)surface view. e TABLE I RULES FOR FUZZY CONTROLLER Δe NB NS ZE PS PB O/P NB NB NB NS NS ZE NS NB NS NS ZE PS ZE NS NS ZE PS PS PS NS ZE PS PB PB PB ZE PS PS PB PB S. N o TABLE III COMPARED WITH CONVENTIONAL SPEED CONTROL APPLIED ON 3 PHASE,415V,3HP INDUCTION MOTOR(Drum size d=.225m) Line Voltage (in volts) Input curren t(in amper es) W 1 Input W 2 Inp ut Loa ds 1 Loa d S 2 (in Kg) Speed Nr(in RPM) MODEL OF INDUCTION MOTOR IN SIMULINK [6] TABLE II.PARAMETERS OF INDUCTION MACHINE[5] Parameters Symbols Values units Shaft power P 2.2 kw Number of pole pairs P 2 Stator resistance R s 2.4 Ω Rotor resistance R r Ω Total leakage factor σ Mutual inductance M 0.1 H Stator(rotor) self inductance L s= L r H Inertia moment J SI Viscous friction coefficient f SI Figure6. Fuzzy scalar speed control of induction motor in Matlab/simulink V. SIMULATION RESULTS Simulation results have been realized under Matlab/Simulink environment. A simullink model is carried out to realize induction motor equations using parameters in Table II. Figure6. shows the implementation of fuzzy controller for scalar control. 148
5 VI. CONCLUSIONS Fuzzy logic controller shows fast control response with induction motor.this controller gives maximum torque over the entire speed range.linguistic rules control the speed.this speed controller shows fast response,smooth performance and high dynamic response with changing and transient conditions. REFERENCES [1 ] Fuzzy Controller for Three Phase Induction Motor Drives by Basem M. Badr,Ali M.Eltamaly and A.I.Alolah. [2 ] Induction Motor Speed Control using Fuzzy Logic Controller by V.Chitra and R.S.Prabhakar,World Academy of Science,Engineering and Technology 23,2006. [3 ] Speed Control of Induction Motor using Fuzzy-PI Controller by Divya Asija,IEEE 2010,2nd International Conference on Mechanical and Electronics Engineering(ICMEE2010),vol.2,pp [4 ] B.K.Bose,Modern Power Electronics and AC Drives,Prentice- Hall,Upper Saddle River,NJ,2002. [5 ] Fuzzy Logic Speed Control Algorithm of Induction Motor Fed by Direct Matrix Converter by F.Tazerart and P.Le Moigne,International Journal of Research and Reviews in Computer Engineering,vol.1,No.1,March [6 ] Scalar Speed Control of a dq Induction Motor model using Fuzzy Logic Controller by Ramon C.Oros,Guillermo O.Fortr,Luis Canali. [7 ] Modeling & Simulation using Matlab -Simulink by Dr. Shailendra Jain,First Edition :2011. [8 ] Leonhard Werner,Control of Electrical Drives,Third edition Springer-Verlag.Berlin(2001). [9 ] Mohan N.,Advanced Electrical Drives Analysis Control and Modeling Using Simulink,MNPERE.Minnesota(2001). [10 ] Afonso,J.L.,Fonseca,J.,Martins,J.S.,Couto,C.A., Fuzzy logic techniques applied to the control of a three- phase induction motor. 149
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