DIRECT TORQUE NEURO FUZZY SPEED CONTROL OF AN INDUCTION MACHINE DRIVE BASED ON A NEW VARIABLE GAIN PI CONTROLLER
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1 Journal of ELECTRICAL ENGINEERING, VOL. 59, NO. 4, 2008, DIRECT TORQUE NEURO FUZZY SPEED CONTROL OF AN INDUCTION MACHINE DRIVE BASED ON A NEW VARIABLE GAIN PI CONTROLLER Eid Al-radadi This paper presents an original variable gain PI (VGPI) controller for speed control of a simplified direct torque neuro fuzzy controlled (DTNFC) induction motor drive. First, a simplified direct torque neuro fuzzy control (DTNFC) for a voltage source PWM inverter fed induction motor drive is presented. This control scheme uses the stator flux amplitude and the electromagnetic torque errors through a four rules adaptive NF inference system (ANFIS) to generate a voltage space vector (reference voltage). This voltage is used by a space vector modulator to generate the inverter switching states. Then a VGPI controller is designed in order to be used as the speed controller in the simplified DTNFC induction motor drive. Simulation of the simplified DTNFC induction motor drive using VGPI for speed control shows promising results. The motor reaches the reference speed rapidly and without overshoot, load disturbances are rapidly rejected and the detuning problem caused by the stator resistance variation is fairly well dealt with. K e y w o r d s: induction motor, direct torque control, direct torque neuro fuzzy control, adaptive NF inference system, variable gain PI controller, space vector modulation 1 INTRODUCTION The apparition of the field oriented control (FOC) made induction machine drives a major candidate in high performance motion control applications. However, the complexity of field oriented algorithms led to the development in recent years of many studies to find out different solutions for the induction motor control having the features of precise and quick torque response. The direct torque control technique (DTC) proposed by I. Takahashi [1] and M. Depenbrock [2] in the mid eighties has been recognised to be a viable solution to achieve these requirements [1 3], [7 9], [11 17]. In the DTC scheme [1] (Fig. 1), the electromagnetic torque and flux signals are delivered to two hysteresis comparators. The corresponding output variables and the stator flux position sector are used to select the appropriate voltage vector from a switching table which generates pulses to control the power switches in the inverter. This scheme presents many disadvantages (variable switching frequency - violence of polarity consistency rules - current and torque distortion caused by sector changes - start and low-speed operation problems - high sampling frequency needed for digital implementation of hysteresis comparators) [8], [11], [13 15], [17]. To eliminate the above difficulties, a Direct Torque Neuro Fuzzy Control scheme (DTNFC) has been proposed [17]. This scheme uses a controller based on an adaptive NF inference system (ANFIS) [5], [6], [10] together with a space voltage modulator to replace both the hysteresis comparators and the switching table. The ANFIS controller combines fuzzy logic and artificial neural networks to evaluate the reference voltage required to drive the flux and torque to the demanded values within a fixed time period. This evaluation is performed using the electromagnetic torque and stator flux magnitude errors together with the stator flux angle. This calculated voltage is then synthesised using Space Vector Modulation (SVM). To generate the desired reference voltage using this scheme, the ANFIS controller acts only on the amplitude of the reference voltage components whereas the angle is chosen from a table. A proposed modification of this scheme is to design an ANFIS controller in order to act on both the amplitude and the angle of the reference voltage components. All the schemes cited above use a PI controller for speed control. The use of PI controllers to command a high performance direct torque controlled induction motor drive is often characterised by an overshoot during start up. This is mainly caused by the fact that the high value of the PI gains needed for rapid load disturbance rejection generates a positive high torque error. This will let the DTC scheme take control of the motor speed driving it to a value corresponding to the reference stator flux. At start up, the PI controller acts only on the error torque value by driving it to the zero border. When this border is crossed, the PI controller takes control of the motor speed and drives it to the reference value. To overcome this problem, we propose the use of a variable gains PI controller (VGPI) [18]. A VGPI controller is a generalization of a classical PI controller where the proportional and integrator gains vary along a tuning curve. In this Department of Industrial Electronics and Control, Madina College of Technology, P.O.Box 15389, Madinah, Saudi Arabia; alradadi2000@yahoo.com ISSN c 2008 FEI STU
2 Journal of ELECTRICAL ENGINEERING 59, NO. 4, Fig. 1. Two-input NF controller structure Fig. 2. Direct Torque Neuro Fuzzy Controller scheme paper, a variable gain PI controller is used to replace the classical PI controller in the speed control of a modified direct torque neuro fuzzy controlled induction machine drive where the ANFIS of the DTNFC acts on both the amplitude and the angle of space vector components. 2 SIMPLIFIED DIRECT TORQUE NEURO FUZZY CONTROLLER Fuzzy logic and artificial neural networks can be combined to design a direct torque neuro fuzzy controller. Human expert knowledge can be used to build an initial artificial neural network structure whose parameters could be obtained using online or offline learning processes. The adaptive NF inference system (ANFIS) [5], [6], [10] is one of the proposed methods to combine fuzzy logic and artificial neural networks. Figure 1 shows the adaptive NF inference system structure proposed in [5], [6], [10]. It is composed of five functional blocks (rule base, database, a decision making unit, a fuzzyfication interface and a defuzzyfication interface) which are generated using five network layers :
3 212 E. Al-radadi: DIRECT TORQUE NEURO FUZZY SPEED CONTROL OF AN INDUCTION MACHINE DRIVE BASED ON A NEW... The block of the proposed self-tuned direct torque neuro-fuzzy controller (DTNFC) for a voltage source PWM inverter fed induction motor is presented in Fig. 2. The internal structure of the NFC is shown in Fig. 3. In the first layer of the proposed NF structure, sampled flux error ε ψ and torque error ε T, multiplied by respective weights w ψ and wt, are each mapped through two fuzzy logic membership functions which are chosen to be triangular shaped as shown in Fig. 4. The second layer calculates the minimum of the input signals. The output values are normalised in the third layer, to satisfy the following relation : Fig. 3. Proposed Neuro Fuzzy Controller Structure σ i = w i k w k (1) where w i and σ i (i = 1,..., 4) are the i th output signal of the second and third layer respectively. σ i is considered to be the weight of the i th component amplitude of the desired reference voltage, so that: V Si = σ i U dc (2) ϕ VSi = γ S + γ i (3) Fig. 4. Triangular membership function sets. Table 1. Reference Voltage Increment Angle Table. ε ψ P N ε T P N P N γ i + π 3 π 3 + 2π 3 2π 3 Layer 1. This layer is composed of a number of computing nodes whose activation functions are fuzzy logic membership functions (usually, triangular or bell- shaped functions). Layer 2. This layer chooses the minimum value of the inputs. Layer 3. This layer normalises each input with respect to the others (The i th node output is the i th input divided the sum of all the other inputs). Layer 4. This layer s i th node output is a linear function of the third layer s i th node output and the ANFIS input signals. Layer 5. This layer sums all the incoming signals. The ANFIS structure can be tuned automatically by a least-square estimation (for output membership functions) and a back propagation algorithm (for output and input membership functions). where V Si is the i th component amplitude of the desired reference voltage, ϕ VSi is the i th component angle of the desired reference voltage, γ S is the actual angle of the stator flux vector and γ i is the increment angle (from Table 1). The components of the desired reference voltage vector are added to each other and the result, is delivered to the space vector modulator which calculates the switching states Sa, Sb and Sc according to the well known algorithm [4], [8], [15]. The proposed NF structure is a simplification of the structure used in [17] and [19] where the first layer is composed of three membership functions (NEGATIVE, ZERO and POSITIVE) and was then governed by nine fuzzy rules. To decrease the number of rules used by the NF structure, we had the idea of merging the zero membership function into both the positive and negative membership functions. This will result in only two membership functions as shown in Fig. 4. The proposed NF structure is then governed by only four fuzzy rules. This will result in decreasing the calculation time by more than a half. 3 VGPI CONTROLLER IN SPEED CONTROL OF THE SIMPLIFIED DTNFC MOTOR DRIVE The use of PI controllers to command an induction motor speed is often characterised by an overshoot in tracking mode and a poor load disturbance rejection. This is mainly caused by the fact that the gains of the
4 Journal of ELECTRICAL ENGINEERING 59, NO. 4, controller cannot be set to solve the overshoot and load disturbance rejection problems simultaneously. Overshoot elimination setting will cause a poor load disturbance rejection, and rapid load disturbance rejection setting will cause important overshoot. Table 2. Induction Machine Parameters. Number of pairs of poles p = 2 Rated power 2 hp Rated frequency 50 Hz Rated speed 1420 rpm Rated voltage 220/380 V Rated current 6.4/3.7 A Stator resistance R s = 4.85 W Rotor resistance R r = W Stator inductance L s = 274 mh Rotor inductance L r = 274 mh Mutual inductance L m = 258 mh Moment of inertia J = kg.m 2 Viscous friction coefficient f = kg.m 2 /s To overcome this problem, we propose the use of variable gains PI controllers. A variable gain PI (VGPI) controller is a generalisation of a classical PI controller where the proportional and integrator gains are not fixed values but increases gradually from an initial value to a terminal value along a polynomial curve [18]. The initial value of the gains can be chosen to attenuate the step response in the transient region [18]. A VGPI controller could then be used to eliminate start up overshoot of the high performance DTNFC induction motor drive. In this section a simulation study of the performances of the simplified direct torque neuro fuzzy controlled induction motor drive is performed by using a VGPI controller. Tuning the modified DTNFC system comes to tuning the weights ω Ψ and ω T so as to minimize the flux and torque errors. These weights are the scaling factors of the flux and torque errors and their tuning corresponds to the two ANFIS structure membership functions width. Since the proposed DTNFC is a high order non linear system, a simple way of tuning it is the successive trials method. It has been shown in [17] that for nonzero synchronous angular speed, the changes of the flux influences the output torque, while the changes in the torque does not influence the flux. That is why the proposed method searches first the flux error minimum, before searching the torque error minimum. The tuning method proposed searches by successive trials method in a grid of values of ω ψ the value that gives the minimum stator flux error, then by using this value, searches in a grid of values of ω T the value that gives the minimum torque error. Using this method the tuning values of the DTNFC are given by ω ψ = 100 and ω T = 10. Figure 5 shows a simulation of the settling performance and the disturbance rejection capability of the simplified DTNFC motor drive with the VGPI speed controller gains given by equations 4 and 5. The VGPI controller is tuned using the method given in [18]. The parameters of the motor used in the simulation are given in Table 2. { t 3 if t < 1, K p = 50 if t 1, { 500t 3 if t < 1, K i = 500 if t 1. (4) (5) Initially the machine is started up with a load of 10 Nm. At 1 s, a 2 Nm load disturbance is applied during a period of 1 s. The sampling time used is 50 µs. The space vector modulator switching frequency used is 20 khz, that is the space vector modulator generates the desired reference vector after one sampling time. The speed of the motor reaches the 1000 rpm reference speed at 0.53 s without overshoot. The VGPI controller compensates the 2 Nm disturbance by increasing the mean value of the torque command from 10.8 Nm to 12.8 Nm. The controller rejects the 2 Nm load disturbance in less than 0.25 s with a maximum speed dip of 0.6 rpm (0.06 %). One can note that the current waveform is almost a sinusoidal waveform as expected using space vector modulator with a 20 KHz switching frequency. Figure 6 shows the speed tracking performance of the system under no load. The slope of the trapezoidal command speed is 2000 rpm/s. The motor speed tracks the trapezoidal commands with zero steady state error and no overshoot Figure 7 shows the reaction of the proposed VGPI controller to stator resistance variation. The motor is started up with a load of 10 Nm. The rotor resistance is supposed to double at 1 sec. Stator resistance variation is shown to affect the mean value of the estimated electromagnetic torque which changes from Nm to Nm. The VGPI controller compensates the torque estimator detuning problem by increasing the mean value of the torque command to about 30 % of its rated value. The VGPI controller rejects the stator resistance disturbance in less than 0.25 s with a maximum speed dip of 0.6 rpm (0.06 %). 4 CONCLUSION In this paper a simplified direct torque neuro fuzzy controlled induction motor drive is presented. This control scheme uses the stator flux amplitude and the electromagnetic torque errors through a four rules adaptive NF inference system (ANFIS) to generate the desired reference voltage. This vector is used by a space vector modulator to generate the inverter switching states.
5 214 E. Al-radadi: DIRECT TORQUE NEURO FUZZY SPEED CONTROL OF AN INDUCTION MACHINE DRIVE BASED ON A NEW... Fig. 5. Settling performance of the proposed DTNFC motor drive using a VGPI speed controller Fig. 6. Speed tracking performance of the proposed DTNFC motor drive using a VGPI speed controller Fig. 7. Variation of the stator resistance.
6 Journal of ELECTRICAL ENGINEERING 59, NO. 4, A VGPI controller has been designed and used as a speed controller in the DTNFC control scheme. Simulation of the simplified DTNFC induction motor drive using VGPI for speed control shows promising results. The motor reaches the reference speed rapidly and without overshoot, trapezoidal commands under no load are tracked with zero steady state error and no overshoot, load disturbances are rapidly rejected and the detuning problem caused by the stator resistance variation is fairly well dealt with. Acknowledgement The author wishes to thank sincerely Mr. A. Draou and Mr. A. Miloudi for the help in preparing this manuscript as well as for fructuous discussions. References [1] TAKAHASHI NOGUCHI, T. : A New Quick Response and High Efficiency Control Strategy of an Induction Motor, IEEE Trans. Ind. Applicat. IA-22 (Sept/Oct 1986), [2] DEPENBROK, M. : Direct Self-Control (DSC) of Inverter Fed Induction Machine, IEEE Trans. Power Electron. PE-3 (Oct 1988), [3] BOLDEA, I. NASAR, S. A. : Torque Vector Control (TVC) A Class of Fast and Robust Torque Speed and Position Digital Controller for Electric Drives, Proc. EMPS 15 (1988), [4] HABLETER, T. G. PROFUMO, F. PASTORELLI, M. TOLBERT, L. M. : Direct Torque Control of Induction Machines using Space Vector Modulation, IEEE Trans. Ind. Applicat. 28 (Sept/Oct 1992), [5] JANG, J.-S. R. : Self-Learning Fuzzy Controllers Based on Temporal Back Propagation, IEEE Trans. Neural Networks 3 (Sept 1992), [6] JANG, J.-S. R. : ANFIS: Adaptive-Network-Based Fuzzy Inference System, IEEE Trans. Syst., Man, Cybern. 23 (May/June 1993), [7] CASADEI, D. GRANDI, G. SERRA, G. : Study and Implementation of a Simplified and Efficient Digital Vector Controller for Induction Motors, in Proc. EMD 93, Oxford, U.K., Sept. 8-10, 1993, pp [8] KAZMIERKOWSKI, M. P. TUNIA, H. : Automatic Control of Converter-Fed Drives, Elsevier, Amsterdam, [9] TIITINEN, P. POHKALAINEN, P. LALU, J. : EPE J. 5 (Mar 1995), [10] JANG, J.-S. R. SUN, C.-T. : Neuro-Fuzzy Modeling and Control, Proc. IEEE 83 (Mar 1995), [11] KAZMIERKOWSKI, M. P. KASPROWICZ, A. : Improved Direct Torque and Flux Vector Control of PWM Inverter-Fed Induction Motor Drives, IEEE Trans. Ind. Electron. 45 (Aug 1995), [12] NASH, J. N. : Direct Torque Control, Induction Motor Vector Control without an Encoder, IEEE Trans. Ind. Applicat. 33 (Mar/Apr 1997), [13] DAMIANO, A. VAS, P. et al : Comparison of Speed-Sensorless DTC Induction Motor Drives, in Proc. PCIM, Nuremberg, Germany, 1997, pp [14] BUJA, G. : A new Control Strategy of the Induction Motor Drives: The Direct Flux and Torque Control, IEEE Ind. Electron. Soc. Newslett. 45 (Dec 1998), [15] VAS, P. : Sensorless Vector and Direct Torque Control, Oxford Univ. Press, Oxford, U.K., [16] CASADEI, D. SERRA, G. TANI, A. : Implementation of a Direct Torque Control Algorithm for Induction Motors based on Discrete Space Vector Modulation, IEEE Trans. Power Electron. 15 No. 4 (July 2000), [17] GRABOWSKI, P. Z. BOSE, B. K. BLAABJERG, F. : A Simple Direct Torque Neuro Fuzzy Control of PWM Inverter Fed Induction Motor Drive, IEEE Trans. Ind. Electron. 47 No. 4 (Aug 2000), [18] MILOUDI, A. DRAOU, A. : Variable Gain PI Controller Design For Speed Control and Rotor Resistance Estimation of an Indirect Vector Controlled Induction Machine Drive, in Proc. IECON 02, Sevilla, Spain, Nov.58, 2002, pp [19] MILOUDI, A. Al RADADI, E. A. DRAOU, A. MILOUD, Y. : Simulation and Modelling of a Variable Gain PI Controller For Speed Control of a Direct Torque Neuro Fuzzy Controlled Induction Machine Drive, in Proc. PESC 04, Aachen, Germany, June , 2004, pp [20] MILOUDI, A. Al RADADI, E. A. DRAOU, A. : A Variable Gain PI Controller Used for Speed Control of a Direct Torque Neuro Fuzzy Controlled Induction Machine Drive, Turkish Journal of Electrical Engineering 15 No. 1 (2007). Received 20 March 2007 Eid Al-radadi was born in Madinah, Saudi Arabia in He received the BEng degree from Detroit Mercy University, USA in 1994, the MSc and PhD degrees from Wayne State University, USA in 2002 all in Electrical Engineering. He was the vice dean for education and training affairs, Medina college of technology in His main research interests are in the field of Power Electronics and Intelligent Control of AC drives. He is now the dean of Medina technical college, and President of technical vocational training council. E X P O R T - I M P O R T of periodicals and of non-periodically printed matters, book s and CD - ROM s SLOVART G.T.G. s.r.o. GmbH E X P O R T - I M P O R T Krupinská 4 PO BOX 152, Bratislava 5,Slovakia tel.: , fax.: gtg@internet.sk, SLOVART G.T.G. s.r.o. GmbH E X P O R T - I M P O R T
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