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Design of embedded based three phase preventor and selector system for industrial appliances
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Design of embedded based three phase preventor and selector system for industrial appliances
1.
INTERNATIONAL JOURNAL OF
ELECTRONICS AND International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME COMMUNICATION ENGINEERING & TECHNOLOGY (IJECET) ISSN 0976 – 6464(Print) ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), pp. 183-188 IJECET © IAEME: www.iaeme.com/ijecet.asp Journal Impact Factor (2012): 3.5930 (Calculated by GISI) ©IAEME www.jifactor.com DESIGN OF EMBEDDED BASED THREE PHASE PREVENTOR AND SELECTOR SYSTEM FOR INDUSTRIAL APPLIANCES Ms. YOGITA V. BHAGWAT Prof. S. A. NAVEED yogita_6@rediffmail.com sa_naveed01@rediffmail.com J.N.E.C. Aurangabad J.N.E.C. Aurangabad ABSTRACT Designing and implementing commercial as well as industrial system based on power electronics has been a prominent field of interest among many researchers and developer. This paper present an implementing methodology for Three phase preventor and selector system. In this paper, preventor and selector system interface with microcontroller 89c51 to control and drive the various domestic and industrial appliances. Keywords: RYB indicator, automatic phase selector circuit, MOSFET based inverter, microcontroller 89c51, induction motor. 1. INTRODUCTION In this exponential development world, 85% appliances are work on three phase supply. Failure of any one phase from this three phase, appliance may be damaged.. This paper is build system that can support one of the phase supplies with the help of existing phase supply. The development of system will be achieved by using microcontroller which is being programmed using IC89c51. Now day’s electric supply has become one of the basic need but due to Environmental conditions and practical limitation the generation of electricity is Insufficient hence to fulfill the Electricity requirement load shading is used, but is not satisfying the complete requirement. Inverter is used to obtain A.C. supply from battery. .Cost of three-phase inverter, which is available in market is more. 183
2.
International Journal of
Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME The system provide the safety operations for industry application. 1. Safety of operation through microcontroller unit. 2. Safety of people and plant. 3. To ensure quality product at reasonable cost and quantity. 4. To satisfy environmental regulations. 5. To satisfy the economics. Fig: 1Block diagram of system 2. SYSTEM ARCHITECTURE The block diagram consists of DIP switch, microcontroller, signal amplifier, inverter circuitry, opto isolator gate drive power supply, 200V unregulated power supply MOSFET inverter, switches 2.1.1 RF CHOCK It consists of capacitor and inductor connected in parallel. Inductor has ability to resist abrupt changes in supply frequency due to which high voltage pulses are removed. Capacitor by passes AC and blocks DC. Any DC component present in AC is removed. The output of RF choke filter is given to step down transformer. 2.1.2 DIP SWITCHES DIP switches are used as input to the microcontroller 89C51. The DIP switches are consist of 8 parallel switches; they are used as follows. SWITCH 1: To turn on or off the whole DIP. SWITCH 2: it is used to select the 120 and 180 deg. mode of inverter. SWITCH 3: MASKED. SWITCH 4: MASKED. SWITCH 5, 6, 7, &8: Used to generate variable frequency. The output of the DIP switches is given to the port 1 of microcontroller 89C51 is used to select the appropriate frequency as well as to select the mode of operation. 184
3.
International Journal of
Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME 2.1.3 MICROCONTROLLER The microcontroller 89c51 is used to generate six pulses PWM output in both 120 and 180 deg. Mode The output of DIP switches is accepted on input port that is port 1 and is processed and transferred on output port to display the six-pulse PWM waveform. Each time an interrupt is generating when particular time period of the frequency selected from DIP switches. 2.1.4 OPTOISOLATOR The output of microcontroller that is six pulses is given to the input of 6 Optoisolator separately. Isolates the control circuitry from the power circuitry. The coast of control circuitry; to avoid this problem the control circuit and power circuit will damage the control circuitry are isolated from each other. 2.1.5 SIGNAL AMPLIFIER The output of opto coupler is not sufficient for driving the MOSFET so amplification of signal is required. The Darlington pair TIP 122 is used which amplifies the signal such that sufficient to drive MOSFET circuitry. The Darlington transistor is mainly used to amplify the current which is required by the mosfet for operation. 2.1.6 INVERTER CIRCUITORY The inverter circuitry consisting of power device named as MOSFET; they are connected in the bridge configuration MOSFET stands for metal oxide semiconductor for filled effect transistor which having many advantages other power device like MOSFET, FET and SCR. The 300V DC power supply is given to inverter circuitry and is converted into the 110 V AC supply. The output of inverter is can be obtained in either 180deg or 120 deg depending on the users requirement In the 120deg mode phase voltage waveform is quasi square while line voltage is of six step waveform. In 180deg mode the phase voltage is of six step waveform while line voltage waveform is quasi square waveform. 2.1.7 OPTOISOLATOR GATE DRIVE POWER SUPPLY The 230V AC 50 Hz is given to the primary winding of the transformer. The secondary winding of the transformer is divided into four winding of the transformer is divided into four winding among which one is connected to the three separate bridge rectifier circuits. The secondary turns of the transformer are reduced to have 12V AC at the secondary winding. The 12V AC is further given to the rectifier circuitry to convert it into 10 V DC. This voltage is further given to opto isolator for its proper operation. 2.1.8 MOSFET BASED INVERTER The D.C. supply to the inverter is derived from single phase 230 VA.C. Mains supply. Here in lies the beauty of the inverter; it provides total isolation of the input supply and output to the motor, allowing us to operate a three phase induction motor on a single phase supply. In system such as electrical vehicles where energy generated Is stored in large battery array, we can replace the A.C. supply- rectifier- filter assembly by a battery and battery charger assembly [1] 2.1.9 SPEED CONTROL OF THREE PHASE MOTOR Various methods are available for control of speed of a motor. These techniques take advantage of various aspects of motor operation [2] briefly, the methods are; 185
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International Journal of
Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME Phase controlled motor drive: This technique involves the control of the phase angle of supply voltage. A slip energy recovery scheme is used along with this to improve the drive efficiency Frequency controlled motor drive: This method involves changing synchronous speed by changing frequency of a.c. supply to motor to cause speed variation, as the true speed of the motor is very close to synchronous speed. Either voltage source inverters or current source inverters may be used. This project is based on a voltage source inverter using this method of speed control. Vector controlled motor drive: Independent control over flux and torque is possible in A.C. drives, as is possible in D.C. drives. The control is achieved by phasor control of rotor flux linkages. Vector control, or alternatively, field oriented control is achieved by suitably controlling the inverter to obtain correct values of frequency, phase, and current and hence control the flux phasor. This control technique has made A.C. drives superior to D.C. drives, as vector control drives provide independent control of flux and torque is improved dynamic response in compare Fig 2: Three Phase appliance protector Automatic phase selector circuit select any one phase from main three phase supply . . The complete circuit of a three Phase appliance protector is described here. It requires three-phase supply, three 12V relays and a timer IC NE555 along with 230V coil contactor having four poles. Relays RL1 and RL2 act as a sensing devices for phases Y and B, respectively. These relays are connected such that each acts as an enabling device for the subsequent relay. Therefore the combination of the relays forms a logical AND gate connected serially. The availability of phase R energies relay RL1 and its normally- opened (N/O) contacts close to connect phase Y to the input of transformer X2. The availability of phase Y energies relay RL2 and its N/O contacts close to connect phase B to the input of transformer X3, thus applying a triggering input to timer IC NE555 (IC1). Therefore the delay timer built around NE555 triggers only when all the phases (R, Y and B) are avail- able. It provides a delay of approximately four seconds, which energies Relay RL3 and its N/O contact closes to connect the line to the energizing coil of four-pole contactor relay RL4. Contactor RL4 closes to ensure the availability of the three-phase supply 186
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International Journal of
Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME to the appliance. The rating of contactor RL4 can be selected according to the full-load current rating of the appliances. Here the contact current rating of the four-pole contactor is up to 32A. The availability of phases R, Y and B is monitored by appropriate LEDs connected across the secondary windings of transformers X1, X2 and X3, respectively. Hence this circuit does not require a separate indicator lamp for monitoring the availability of the three phases. When phase R is available, LED1 glows. When phase Y is available, LED2 glows. When phase B is available, LED3 glows. The main advantage of this protector circuit is that it protects three-phase appliances from failure of any of the phases by disconnecting the power supply through the contactor and automatically restores the three-phase supply to the appliance (with reasonable time delay) when all the phases are available. 3. EXPERIMENTAL RESULT Fig.4: TP1, TP2, TP3, TP4, TP5, TP6 – R, Y, B Phase Outputs of 89c51 Fig. 5: Control Pulse Fig. 6: RYB phase output of inverter with respect to neutral 187
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International Journal of
Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 1, January- February (2013), © IAEME 4. CONCLUSION Using microcontroller we can operate different industrial operation in relation with their time using Three phase preventor and selector system. The system has significant excellences such as continue supply and low expenses. 5. REFERENCES 1] T. Hori, H. Nagase, and M. Hombu,” Induction Motor control system”, Industrial electronics Handbook J.D. Irwin, pp.310-315.CRC Press, 1997 2]. P.N Enjeti and A.Rahman, “A New Single-Phase to Three Phase Converter with Active Input Current Shaping for Low Cost Ac Motor Drives”, in conf.Rec.IEEE-IAS Annu Meeting, pp. 935 – 939, 1983 3]. P.N Enjeti and A.Rahman, “A New Single-Phase to Three Phase Converter with Active Input Current Shaping for Low Cost Ac Motor Drives”, in conf.Rec.IEEE-IAS Annu Meeting, pp. 935 – 939, 1983 4] A.B. Plunkett, “ A current controlled PWM inverter drives”, IEEE IASAnnu. Meet. Conf. Rec ., pp.785-792,1979 5] Austin H. Bonnet: “Analysis of the impact of pulse-width modulated inverter voltage waveforms on AC induction motors”; IEEE Trans-IAMar/Apr. 1996 pp.386-392 6]. K.Ranj i th kumar , S.Pal ani swami ,D.Sakthibal a, “Efficiency Optimization of Induction Motor Drive Using Soft Computing Techniques”, International Journal of Computer Applications, Vol. 3,No.1, pp. 6-12, June 2010 7] Microcontrollers & Embedded System Designs, http://www.ucdevelopers.page.tl/ 8] J. Holtz. Pulse width Modulation for Electronic PowerConversion. Proc. of the IEEE, Vol. 82, No.8 pp. 1194 –1213, Aug 1994 9] B.K.Bose ,Power Electronics and variable frequency drives, IEEE press,NY,1996 10] Malesani, L.; Tenti, P.,Three-Phase AC/DC PWM Converter with Sinusoidal AC Currents and Minimum Filter Requirements, IEEE Transactionson Industry Applications, Vol. IA-23, No.1, January/February1987. 11] B. Wu, S.B Dewan and G.R.Slemon ,”PWM CSI Inverter for induction motor drives ,” IEEE Trans. On Ind. Appl., Vol.22, pp.1052-1072, Nov./dec.1986 12]International Standard s for all electrical, electronic and related technologies available at http://www.iec.ch 13] P.H. Zope, Prashant Sonare, Avnish Bora And Rashmi Kalla, “Simulation And Implementation Of Control Strategy For Z-Source Inverter In The Speed Control Of Induction Motor” International Journal of Electrical Engineering & Technology (IJEET), Volume 3, Issue 1, 2012, pp. 21 - 30, Published by IAEME. 14] Vaibhav B. Magdum, Ravindra M. Malkar and Darshan N. Karnawat, “Study & Simulation Of Direct Torque Control Method For Three Phase Induction Motor Drives” International Journal of Electrical Engineering & Technology (IJEET), Volume 2, Issue 1, 2011, pp. 1 - 13, Published by IAEME. 188
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