Implementation of interleaved boost converter fed DC Drive.
Power Electronic (PE) converters are now being used in the processing of electrical energy in industrial applications such as adjustable speed drives, SMPSs, UPSs, etc.  Therefore, the converters with high power factor are highly required in industries. Most of the PE systems which get connected to AC utility mains use diode rectifiers at the input. The nonlinear nature of diode rectifiers causes significant line current harmonic generation; thus, they degrade power quality, increase losses, failure of some crucial medical equipment, etc. Therefore, power factor correction (PFC) circuits are incorporated in PE systems. Earlier, to reduce rectifiergenerated harmonics, expensive and bulky filter inductors and capacitors were installed, but they effectively eliminate only certain harmonics .The active power line conditioners are generally hard switched; hence, the components are subjected to high-voltage stresses which increases further with increase in the switching frequency. Also, hard switching results in low efficiency, large EMI, etc., This paper proposes a high efficiency AC/DC boost converter to control a DC drive .The proposed single-switch type soft-switching boost converter minimizes switching loss by adopting a resonant soft-switching method.- And, no additional switches are needed for soft switching. Also, the proposed model reduces the input current ripple, output voltage ripple, and size of the passive components. The proposed soft-switching interleaved boost converter not only design and analysis of Interleaved Soft Switching Boost Converter Fed DC Drive exploits the interleaved converter but also reduce switching losses through the soft-switching technique. Therefore, the output power can be boosted with high efficiency.
The circuit shown in Fig.1 is the interleaved boost converter which consists of two single-phase boost converters connected in parallel and then to a single output capacitor. The two PWM signal difference is 180 degree and each switch is controlled in the interleaving method. Since each inductor current magnitude is decreased according to one per phase, the inductor size and Inductance can be reduced and also the input current ripple is decreased.
Initially, the switch is in off state and the DC output of the diode rectifier is transmitted directly to the load through L2 and D10. In this mode, the main inductor voltage becomes - (VO - VIN). Thus, the main inductor current decreases linearly. If the switch is turned on under zero-current switching because of the resonant inductor L3. As the output voltage is supplied to the resonant inductor L3, the current increases linearly. When the resonant current becomes equal to the main inductor current, the current of the output side diode D10 becomes zero. The resonant inductor L3 and the resonant capacitor C3 resonate and the voltage of C3 decreases from the output voltage VO to zero. The main inductor current iL2 flows through L3 and the switch. When the resonant capacitor voltage VC3 becomes zero, the two auxiliary diodes D5 and D6 are turned on and therefore the resonant inductor current now flows through main inductor L2 and through the two auxiliary diodes. The main inductor current increases linearly. The switch turns off under the zero-voltage
The circuit in Fig.2 gives the simulink model of interleaved soft switching boost converter. The graph shown in Fig 2(a) is the AC input voltage .The peak value of AC input voltage is 100V.Fig 2(b) shows the output voltage of rectifier. The DC output of the rectifier is 70V.Switching pulses for the switches M1 and M2 are shown in Fig 2(c). Switching pulses are displaced by 180 degrees. Boosted Output Voltage is shown in Fig 3(a). The voltage is boosted to 190V and current drawn by the load is shown in Fig 3(b). The armature current is 3.9A. Interleaved soft- switching boost converter fed DC drive is shown in Fig 4. The speed can be varied over a wide range. The motor speed and Torque are shown in Figures 4(a) and 4(b) respectively. The speed increases and settles at 220 rad/sec condition because of the auxiliary resonant capacitor C2. The current divides it two paths.. One is the L-C3 -VIN loop for which the voltage of the resonant capacitor C3 increases linearly from zero to the output voltage Vo. The other is the L3-C2-D5 loop for which the second resonance occurs. The energy stored in L3 is transferred to C3. The resonant current decreases linearly and the voltage across C2 reaches maximum. When the resonant capacitor voltage Vc3 is equal to the output voltage VO, the energy flow from L3 to C2 is completed and the resonant current iL3 becomes zero. Then, the voltage of C2 decreases, continuously resonates on the D6-C2-L3 -D10-C6 loop and the energy is transferred from C2 to L3 . When the Vc2 becomes zero, the resonant current reverses its direction. When the voltage of C2 becomes zero, the antiparallel diode of the switch turns on. And now the current flows in two paths. The main inductor current iL2 transmits energy to the output through D10 and decreases linearly. The resonant inductor current iL3 also transmits energy to the load through DIO and flows through the antiparallel diode of the switch
An interleaved converter has been constructed to feed a dc motor. A PI controller has been designed to regulate the speed of the motor. This has accomplished by a closed loop control algorithm through a suitable modification in the duty cycle. A micro controller has been programmed to generate the PWM pulses for the power switches in the converter, besides serving to perform the function of PI controller. It has been shown that the control algorithm works effectively. The scheme has been found to reject the load and source disturbances. The simulation and experimental results have been found to display the capability of the converter to handle transient disturbances and claims its use in sophisticated applications. Their close comparison highlights the merits of this scheme and points out that it will go a long way to explore innovative applications in this domain.
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(1) N. Dhanasekar, (2) M. Arunprakash, (3) S. Jagadeeswari, (4) S. Nanthitha
(1) Associate professor, Department of Electrical and Electronics Engineering, AVC College of Engineering, Anna University, Mailyladuthurai, Tamilnadu, India.
(2) Assistant professor, Department of Electrical and Electronics Engineering, AVC College of Engineering, Anna University, Mailyladuthurai, Tamilnadu, India.
(3) UG student, Department of Electrical and Electronics Engineering, AVC College of Engineering, Anna University, Mailyladuthurai, Tamilnadu, India.
(4) UG student, Department of Electrical and Electronics Engineering, AVC College of Engineering, Anna University, Mailyladuthurai, Tamilnadu, India.
Received 28 January 2017; Accepted 22 March 2017; Available online 4 April 2017 Correspondence:
Address For N. Dhanasekar, Associate professor, Department of Electrical and Electronics Engineering, AVC College of Engineering, Anna University, Mailyladuthurai, T amilnadu, India.
Caption: Fig. 1: Interleaved Soft Switching Boost Converter
Caption: Fig. 2: Simulink model of Interleaved Soft Switching Boost Converter
Caption: Fig. 2(a): AC Input Voltage
Caption: Fig. 2(b): Output Voltage of Rectifier
Caption: Fig. 2(c): Switching pulses for M1 and M2
Caption: Fig. 3(a): Output Voltage of Boost Converter
Caption: Fig. 3(b): Output Current
Caption: Fig. 4: Interleaved Boost Converter fed DC Drive
Caption: Fig. 4(b): Torque Developed
Caption: Fig. 4(a): Motor Speed
Caption: Fig. 4(C): Performance waveform
Caption: Fig. 5(a): Experimental setup
Caption: Fig. 5(b): Output Waveforms
Caption: Fig. 5(c): Waveform of load disturbance
Table 1(a): Performance Comparison Load KW Load voltage (V) Load Current (A) Simulation Hardware Simulation Hardware 1 200 200 4.3 4.5 1.5 200 200 6.5 6.5 2 200 200 8.6 8.5 2.5 200 200 10.8 11.0 3 200 200 13.0 13.0 3.5 200 200 16.3 16.5 Load KW Speed (rpm) Simulation Hardware 1 1500 1500 1.5 1500 1500 2 1500 1500 2.5 1500 1500 3 1500 1500 3.5 1500 1500
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|Author:||Dhanasekar, N.; Arunprakash, M.; Jagadeeswari, S.; Nanthitha, S.|
|Publication:||Advances in Natural and Applied Sciences|
|Date:||Apr 1, 2017|
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