International Research Journal of Power and Energy Engineering Vol. 3(2), pp , November, ISSN: x

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1 International Research Journal of Power and Energy Engineering Vol. 3(2), pp , November, ISSN: x IRJPEE Conference Paper Soft-Switching and Low Ripple Interleaved Boost Converter with Photo-Voltaic System to Drive Universal Motor *Prasanna Kumar C 1, Mahesh M 2 and Chowdareddy V 3 1,2,3 Department of EEE, PESIT, Bangalore, India In this paper novel interleaved boost converter (IBC) with snubber circuit is presented. It is compared with conventional boost and IBC. In the proposed topology current stress on each switch is one fourth of input current. Simulation comparison is done for 1hp universal motor and it is proved that proposed converter gives near to the designed values of output voltage, current and power. Ripples in boost, IBC and proposed IBC system are compared. Ripples of the parameter voltage, current and power are reduced with snubber. Also proposed system with hard switching efficiency is about 92% and its efficiency is increased to 93.37% with soft switching. Keywords: conventional Boost, IBC, PV system, PWM ICs, soft switching. INTRODUCTION Since almost every house has the 1hp motor to pump the water to the overhead tank. When the conventional energy demand is more than generation, the alternative renewable that to photovoltaic (PV) is the better choice. The conventional boost is not advisable for more than 300W applications. Hence IBC, initially these IBCs was used for low power applications like spacecraft, satellite applications. If the IBC is operated exactly at 50% duty cycle the total ripple can be reduced to zero. The most of the applications required the converter to give more voltage gain. During this requirement IBC is the preferable complementary metal oxide (CMOS) with coupled inductor IBCs developed to handle high circulating current [Ho et al., 2011; Xu et al.,2011; Van Nguyen et al., 2011; Everts et al., 2012; Zhang et al., 2012; Zhao et al., 2012). IBC also reduces the Equivalent Series Resistance (ESR) of the capacitor. The reverse recovery problem of power diodes is overcome with use of Silicon Carbide (SiC) diodes. Other IBCs are developed with the use of current source driver (CSD) and digital signal processor (DSP) for the closed loop operation. Since it is operating at high frequency and working in CCM (Do and H-L, 2011; Chang et al., 2012; Freitas et al., 2015; Garcia et al., 2013). The closed loop operation is obtained with use of pulse width modulation integrated circuits (PWM ICs) (e Silva et al., 2014; Fukaishi et al., 2013; Zhang et al., 2014). The block diagram of proposed system as shown in Fig.1 solar modules can be installed and connected to the proposed converter. Since the particular application is to pump the water to the overhead tank, it is preferable to use solar energy directly to the proposed converter with proper devices like power diode and capacitor bank. It makes to save lot of money on storage through battery. PWM ICs are used for the close loop operation and required phase difference between switching pluses. PV System IBC with PWM ICs Universal Motor Fig.1. Block diagram of proposed system *Corresponding author: Prasanna Kumar C, Department of EEE, PESIT, Bangalore, India. cpkme@yahoo.com

2 Prasanna et al. 052 The operation of this particular application need only few hours a day. Once the investment is made on solar module, it is advisable to invest on batteries so that the house power will be off-grid. The proposed system will work without isolation transformer so that its weight reduced and became portable. Proposed IBC to drive 1hp Universal motor In the circuit four PV modules of each 240WP and 12V are can be placed at the terrace. These modules are connected in series so that total input voltage about 48V is boosted to 230V. The amount of power required will be obtained from the solar module. If it through battery required power is available to drive the load as well as white goods. The modification in conventional IBC is made in proposed system by making switching in parallel. This modification has the advantage is that current stress on each switch is very much reduced. Hence it is possible to operate this converter without isolation transformer. Hence E=4.38*10-3 Joules N = LI M (4) A C B M N-no.of turns, L-inductance and AC-core area AC=1.82 mm 2, πr 2 = 1.08mm 2, r=0.58mm, dia=1.16mm, SWG=18 lg = μ 0 N 2 A C (5) L Lg-air gap, µ0-absolute permeability lg=1.55mm, IM=3.54A, therefore L=0.7mH Simulation and comparison In this section of paper, comparisons of conventional boost, conventional IBC and modified IBC are presented. Comparison of IBC with modified IBC along with softswitching is done. These converters are designed and simulated for 1hp load. Fig.3 is the normal boost simulation circuit and its output current, voltage and power are obtained as shown in Fig.4from the Fig.5 shows that current stress on switch is about 16A. Fig. 2 Circuit diagram of proposed converter In the above circuit source is PV system, as it mentioned that application is only in the day time no need of storage. As the IBC is became more popular of high power applications by making connections of two conventional boosts in parallel. In the proposed converter attempt is made to reduce further by connecting two switching in parallel per leg to work together as a single switch. Fig.3 Conventional Boost converter Inductor Design for Proposed IBC: The inductor design for the conventional IBC and the proposed system are the same. The total value obtain can be made exactly half for IBC and for proposed IBC system. This can be preceded as E= 1 2 LI2 (1) 2E A p = (2) K w K c J B m Ap area product, E-energy, Kw&Kc are constants, J-current density, Bm- Max. flux density I M = I L + I L (3) 2 IM- peak current, IL-inductor current, IL-change in inductor ripple current Considered the standard values of KC=1, KW=0.6, BM=0.2T & J=3*10 6 A/M 2 Fig.4 output current, voltage and power waveforms of Boost Converter

3 Int. Res. J. Power Energy Engin. 053 current 16A current 8A Fig.5 switching current through switch of boost converter Fig.8. switching currents through switchs of IBC Fig.6. Conventional IBC without snubber Fig. 9. variation of voltage,power and current with different percentage of duty cycle of IBC Fig.7. Output current, voltage and power waveforms of IBC Fig.10. Proposed IBC with snubber

4 Prasanna et al. 054 Fig.13. variation of voltage,power and current with different percentage of duty cycle of IBC with snubber Table 1: Comparison of boost, IBC and proposed IBC Fig.11. output current, voltage and power waveforms of proposed IBC with snubber current 4A Fig.12. switching currents through switchs of proposed IBC Parameters Boost IBC IBC-with snubber Output current (A) (Theoretical=3.25A) Output voltage (V) (Theoretical=231V) Output power (W) (Theoretical=750W) Inputcurrent (A) (Input voltage(48v) Efficiency (%) Fig.6 is the conventional IBC, where the simulation of circuit is performed. Fig.7 is the output parameter with ripple is present for few microseconds. In the Fig.8 input current is equally shared because of interleaved, current stress on switches is reduced by 50% compared to boost converter. Fig.9 voltage, power and current variations with different percentage of duty cycle of IBC. Fig.10 is the simulation of proposed IBC with snubber. Fig 11 indicates except the transient, output current voltage and power waveforms are doesn t have the ripple. Fig.12 shows that current stress on switches is reduced by one fourth compared to boost. Fig. 13 is similar to that of conventional IBC, so with the modification, the operation of IBC remains the same only the current stress on switches reduces. Table 1 compares the electrical parameters of boost, IBC and proposed IBC system where the parameters obtained from proposed converter are more suitable.

5 Int. Res. J. Power Energy Engin. 055 CONCLUSION The proposed system is evaluated for 1hp load, comparison of boost, IBC and modified IBC are simulated. Soft switching is implemented for the proposed converter where the efficiency is increased about 2.47% compared to boost and it is 1.37% more compare to IBC. With the comparison of these three converters with soft switching and modification of IBC is more appropriate for high rating applications. With the application consider to drive universal motor proposed system is more suitable and not depends on conventional and also one-time investment makes the system is almost free for other fifteen years. Future scope is to develop hardware with the proposed converter along with hardware suitable snubber. REFERENCES Chang, Long-Yi, Kuei-Hsiang Chao, and Tsang-Chih Chang. (2012). A High Voltage Ratio and Low Ripple Interleaved DC-DC Converter for Fuel Cell Applications. The Scientific World Journal. Do, H-L (2011). Interleaved boost converter with a single magnetic component. IET power electronics 4, no. 7: De Silva, Ranoyca Nayana Alencar Leão, Fernando Lessa Tofoli, Paulo Peixoto Praca, Demercil de Souza Oliveira, and Luiz Henrique Silva Colado Barreto (2014). Soft switching high-voltage gain dc dc interleaved boost converter. IET Power Electronics 8, no. 1: Everts, Jordi, Jeroen Van den Keybus, Florian Krismer, Johan Driesen, and Johann W. Kolar (2012). Switching control strategy for full ZVS soft-switching operation of a dual active bridge AC/DC converter. Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC), pp Freitas, Antônio Alisson Alencar, Fernando Lessa Tofoli, Edilson Mineiro Sá Júnior, Sergio Daher, and Fernando Luiz Marcelo Antunes (2015). High-voltage gain dc dc boost converter with coupled inductors for photovoltaic systems, IET Power Electronics 8, no. 10: Fukaishi, Yuji, Kohji Higuchi, Hiroyuki Furuya, and Yuki Satake (2012). Design of robust digital controller for interleave PFC boost converter with DC-DC converter load. In Electron Devices and Solid State Circuit, pp Garcia, Fellipe S., Jose Antenor Pomilio, and Giorgio Spiazzi (2013). Modeling and control design of the interleaved double dual boost converter. IEEE Transactions On Industrial Electronics 60, no. 8: Ho, C. N. M., Breuninger H., Pettersson S., Escobar G., Serpa L., and Coccia A. (2011). Practical implementation of an interleaved boost converter using SiC diodes for PV applications. In Power Electronics and ECCE Asia (ICPE and ECCE), 2011 IEEE 8th International Conference on, pp Van Nguyen, The, Pierre-Olivier Jeannin, Jean-Christophe Crebier, and Jean-Luc Schanen (2011). A new compact, isolated and integrated gate driver using high frequency transformer for interleaved Boost converter. IEEE Energy Conversion Congress and Exposition, pp Xu, Xiaojun, Wei Liu, and Alex Q. Huang (2009). Twophase interleaved critical mode PFC boost converter with closed loop interleaving strategy. IEEE Transactions on Power Electronics 24, no. 12: Zhang, Xuning, Paolo Mattavelli, and Dushan Boroyevich (2012). Impact of interleaving on input passive components of paralleled DC-DC converters for high power PV applications. In Power Electronics and Motion Control Conference, 15th International, pp. LS7d-5. Zhang, Zhiliang, Chuangang Xu, and Yan-Fei Liu (2014). A digital adaptive discontinuous current source driver for high-frequency interleaved boost PFC converters. IEEE Transactions on Power Electronics 29, no. 3: Zhao, Yi, Yuan Yao, Xing Xiang, Hongbin Yu, Wuhua Li, and Xiangning He (2012). Performance analysis of interleaved boost converter with voltage gain extension cell. IEEE Energy Conversion Congress and Exposition (ECCE). Accepted 23 October, 2017 Citation: Prasanna KC, Mahesh M and Chowdareddy V (2017). Study H and Estimation of Energy Transfer to the Active DC-Link Capacitor Due to Harmonic Current. International Research Journal of Power and Energy Engineering, 3(2): Copyright: Prasanna et al. This is an openaccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.