Variable Voltage Variable Frequency Speed Control of Induction Motor Using FPGA-Xilinx

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2 because, to avoid insulation break down, the stator voltage must not exceed its rated value. This principle is illustrated in fig 1. the ripple in torque occurs, but it can occur only at low frequency [4]. mf PWM CONTROLLER USING XILINX SOURCE INVERTER SECOND ORDER LOW PASS FILTER THREE- PHASE SQUIRREL INDUCTION MOTOR CONSTANT LOAD TORQUE ma VOLTMETER CONTROL SIGNALS FOR CHANGING THE VALUE OF mf AND ma PI CONTROLLER USING XILINX ERROR - + FUNDAMENTAL COMPONENT OF LINE TO LINE REFERENCE Fig 2 -Block diagram for closed loop control of three-phase induction Fig -1: Voltage versus frequency under the constant V/Hz principle 1.2 CLOSED LOOP CONTROL OF THREE-PHASE INDUCTION Here in the proposed scheme firstly three-phase induction motor is fed by three-phase voltage source inverter in open loop, in which sine pulse width modulation technique is used for generating the controlling waveform. The control strategy is made by using Xilinx[3]. Here in first case the induction motor is fed without any filter by taking the following values of mf and ma. Amplitude modulation index (ma) = 0.8 Frequency modulation index (mf) = 27 The line current THD is 11.3%. The torque ripple is also too much. So to reduce line current THD, a Second Order low pass filter is used in between VSI and Induction Motor with parameters given below. 2. DESCRIPTION OF CONTROL STRATEGY FOR V/HZ CONTROL OF INDUCTION MOTOR For closed loop control using v/f control of three-phase Induction motor, the control strategy is made in such a way that v/f ratio can be changed from, 220 Volts / 60 Hz to 1) 198 Volts / 54 Hz 2) 176 Volts / 48 Hz 3) 132 Volts / 36 Hz First of all, fundamental component of line to line voltage input to motor is taken and subtracted it from reference voltage to obtain error voltage, this error voltage is then fed to PI controller as shown in Fig. 3 Damping factor (ξ) = Cutoff frequency (ω) =2π*300 rad/sec Fig -3: PI controller using Xilinx The general block diagram for closed loop control of three-phase induction motor is shown in fig For making closed loop control of v/f control, fundamental component of line to line voltage is taken and subtracted it from reference voltage to obtain error voltage, this error voltage is fed to PI controller. The output of PI Controller is then used for changing the value of ma and mf, for changing the magnitude of input voltage of induction motor and frequency respectively. The output of PI Controller is always an integer value, which is the main feature of PI Controller using FPGA. However sometimes there is fluctuation of one or two unit occurs due to which Paragraph The output of PI controller is then used for changing the value of ma and mf, i.e. for changing the magnitude of input voltage of induction motor and frequency respectively. Where ma = Amplitude modulation index = Maximum value of sinusoidal wave Maximum value of triangular wave mf = Frequency modulation index = Frequency of triangular wave Frequency of sinusoidal wave Here for changing the value of ma, only the maximum value of sine wave is changed, and value of 2015, IRJET.NET- All Rights Reserved Page 1269

3 amplitude of triangular wave will not changed. For changing the value of mf, both the frequency of sine and triangular wave will change in such a way that value of mf is integer. Now for changing the speed of motor by v/f method, we have to change the reference voltage. When the reference voltage will change, the output of PI controller will also change proportionally [5]. The value of output of PI controller is actually the maximum value of sine wave. However the magnitude of triangular wave is 64 units S. no. Frequency of sine wave Reference line to line voltage Output of PI Controller (Maximum value of sine of sine wave ) ma (Amplitude modulation index) Hz 220 volts 53 53/64 = Hz 198 volts 46 46/64 = Hz 176 volts 42 to 43 42/64 = Hz 132 volts 40 to 38 38/64 = Table -1: Output of PI controller corresponding to particular value of reference voltage The value of output of PI controller corresponding to particular value of reference Voltage is shown in Table 1. The corresponding value of ma is also shown in Table 1. The output of PI controller is directly multiplied to reference sine wave for changing the value of ma as shown in fig 4. Depending on the value of output of PI controller, the logic is made using Xilinx block set as shown in fig. 4, which can select the frequency of sine wave and also triangular wave. Here there is the limitation imposed by the Xilinx which is that explicit period must be integer multiple of system simulink period. Due to which only those frequency are allowed, which are having explicit period integer multiple of system simulink period. Fig -4: Controller Selection of frequency of sine wave & change in the magnitude of sine wave. Fig -5: Simulation diagram of closed loop control of three-phase induction motor using v/f control method. Now output of both multiplexer, one belonging to triangular wave and other belonging to sine wave are compared in Rational operator, for getting controlled sine PWM signals which are on the basis of change of reference line to line voltage [6]. The complete diagram of controlled strategy of closed loop control of induction motor using v/f method is shown in fig , IRJET.NET- All Rights Reserved Page 1270

4 Fig -6: Controlling scheme for v/f control of SPWM fed threephase induction motor using Xilinx block. Fig -7: Speed vs. time characteristic of three-phase induction motor, involving the change in v/f ratio at t = 1 sec. from 220/60 to 198/54. Fig. 8 shows the input current characteristic of induction motor, involving the change in v/f ratio to 198/54 at t = 1 sec. Here it has been observed that when the change occurs then the maximum value of transient current is 90 Amps, which is not so large. 2.1 RESULTS & DISCUSSION FOR CLOSED LOOP CONTROL OF THREE-PHASE INDUCTION MOTOR As the motor speed is varied in three steps by keeping v/f ratio constant, so results are also analyzed in three v/f ratios as following. 1) When ratio of voltage and frequency change from 220 Volts / 60 Hz to 198 Volts / 54 Hz. As for changing the v/f ratio in the simulation model, we have to change only the value of reference voltage from 220 volts to 198 volts at t = 1 sec as shown in fig 5.6. However the value of DC link voltage is same calculated earlier which is 449 volts. When the ratio of voltage and frequency is 220/60, then the value of ma is and value of mf is 27. If the ratio is 198/54, then the value of ma is and value of mf is 24. Fig 7. shows the performance characteristic of three- phase induction motor. As shown in fig. 7, speed of three-phase induction motor before change in v/f ratio is 1732 rpm, when there is change in v/f occurs at t = 1 sec, then the speed of motor is 1546 rpm. It has also been observed that when change in v/f occurs, then the transient period of only 0.1 second occurs [7]. Fig -8: Current vs. time characteristic of induction motor involving change in v/f ratio at t = 1 sec from 220/60 to 198/54. Fig 5.11 (a) FFT analysis of line current input to induction motor before change in v/f ratio. Fig 5.11 (b) FFT analysis of line current input to induction motor after change in v/f ratio. 2015, IRJET.NET- All Rights Reserved Page 1271

5 Fig 5.12 Electromagnetic torque vs. time characteristic of induction motor having change of v/f ratio at t = 1 sec. Fig FFT analysis of line current of induction motor after change in v/f at t = 1 sec. Fig Speed vs. time characteristic of induction motor having change of v/f from 220/60 to 176/48 at t = 1 sec. Fig Current vs. time characteristic of induction motor having change in v/f ratio from 220/60 to 132/36 at t = 1 sec. Fig Current vs. time characteristic of induction motor having change of v/f from 220/60 to 176/48 at t = 1 sec Fig Speed vs. time characteristic of induction motor having change in v/f ratio from 220/60 to 132/36 at t = 1 sec. Fig FFT analysis of line current of induction motor after the change in v/f ratio Fig Torque vs. time characteristic of induction motor having change in v/f ratio from 220/60 to 176/48 at t = 1 sec. Fig Torque vs. time characteristic of induction motor having change in v/f ratio from 220/60 to 132/36 at t = 1 sec Fig Response of PI controller having change in v/f ratio from 220/60 to 176/48 at t = 1 sec. 3. CONCLUSIONS Firstly SPWM signals are generated by control strategy using Xilinx block set, and then the Induction motor is 2015, IRJET.NET- All Rights Reserved Page 1272

6 simulated in open loop using Matlab/Simulink. But the performance of induction motor is not satisfactory. For mf = 27, and ma = 0.8, line current THD of VSI fed three-phase induction motor without using filter is 12.91%. Due to which the torque ripple and losses in system are also high. By using second order Filter (ω=300*2*pi and ξ=0.4), line current THD decreases to 1.35%. REFERENCES [1] [1] Nabae, I. Takahashi and H. Agaki, A New Neutral- Point-Clamped PWM Inverter, IEEE Transactions on Industry Applicaitions. Vol.IA-17, No.5, Sep./Oct., 1981, pp [2] R. Nandhakumar, S. Jeevananthan and P. Dananjayan, Design and Implementation of an FPGA Based High Performance ASIC for Open Loop PWM Inverter, IICPE, 2006, pp [3] Reddy M. H. V. and Jegathesan V., Open loop V/f control of induction motor based on hybrid PWM with reduced torque ripple, International Conference on Emerging Trends in Electrical and Computer Technology, pp , March [4] Arulmozhiyal, R. Baskaran, K. Devarajan and N. Kanagaraj, Space Vector Pulse Width Modulation Based Induction Motor Speed Control Using FPGA, ICETET, Dec 2009, pp [5] A.Fratta, G. Griffero and S. Nieddu, Comparative analysis among DSP and FPGA-based control capabilities in PWM power converters, Proceedings of the 30th Annual Conference of the IEEE Industrial Electronics Society (IECON.04) Novemeber, pp [6] C. Mademlis and N. Margaris, "Loss minimization in vector-controlled induction motor drives," Industrial Electronics, IEEE Transactions on, vol. 49, pp , [7] X. Jian-Xin, S. K. Panda, P. Ya-Jun, L. Tong Heng, and B. H. Lam, "A modular control scheme for induction motor speed control with pulsating torque minimization," Industrial Electronics, IEEE Transactions on, vol. 51, pp , 2004 [8] S. Zhang, C. Zhu, J. K. O. Sin, and P. K. T. Mok, A novel ultrathin elevated channel low-temperature poly-si TFT, IEEE Electron Device Lett., vol. 20, pp , Nov [9] Taro Genda, et.al, Basic Performance of Inset Type PMSM IEEE conference on Electrical Machine; PaperID 1422, 2008 [10] Purohit, Purnima; Dubey, Menka, "Analysis and design of hysteresis current controlled multilevel inverter fed PMSM drive," Electrical, Electronics and Computer Science (SCEECS), 2014 IEEE Students' Conference on, vol., no., pp.1,5, 1-2 March 2014 [11] N. Urasaki; T. Senjyu; K Uezato, An Accurate Modeling for Permanent Magnet Synchronous Motor Drives, Applied Power Electronics Conference and Exposition, APEC 2000, Vol. 1, 6-10 Feb. 2000, pp: , IRJET.NET- All Rights Reserved Page 1273

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