High Intensify Interleaved Converter for Renewable Energy Resources

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1 High Intensify Interleaved Converter for Renewable Energy Resources K. Muthiah 1, S.Manivel 2, Gowthaman.N 3 1 PG Scholar, Jay Shriram Group of Institutions,Tirupur 2 Assistant Professor, Jay Shriram Group of Institutions,Tirupur 3 Assistant Professor, Karpagam College of Engineering, Coimbatore Abstract In this paper, high intensify interleaved converters is proposed. By interleaving two dc dc converter separate low voltage input and parallel output connection, both input current ripple and voltage ripple can be reduced. The size of the magnetic components and current stress of the semiconductor devices on the input side are also reduced. Dc output is given to the inverter and its connected to the micro grid.maximum power point tracking control technique is used to generate the phase shifted gate signals and implement a digital control system. The main features of the proposed system are high efficiency, small passive components size and small input current ripple. Pertaining to the stability of the micro grid. The proposed converter enables communication less operation of each of the elements of the micro gird system it is also considered that the sources are of different power capacity as can be seen in typical autonomous micro grid.to control each of the distributed system generating sources in a decentralized manner to stabilize the overall micro grid system 1. Introduction In recent years, distributed generation (DG) systems based on renewable energy sources.this systems are composed of micro source like fuel cells, photovoltaic (PV) cells, and wind power. Fuel cells and PV source are low-voltage sources to provide enough dc voltage for generating ac utility voltage. Although PV cells can connect in series to obtain sufficient dc voltage, it is difficult to avoid the shadow effect. So, high step-up dc dc converters are usually used as the front-end converters to step from low voltage to high voltage which are required to have a large conversion ratio, high efficiency, and small volume. Theoretically, the boost converter can provide a high step-up voltage gain with an extremely high duty cycle. In practice, the step-up voltage gain is limited by the effect of the power switch, rectifier diode, and the equivalent series resistance of the inductors and capacitors.extreme duty cycle operation may result in serious reverse-recovery and electromagnetic interference problems. Forward and flyback converters are adjust the turn ratio of the transformer to achieve a high step up voltage gain. The main switch will suffer high voltage spike and high power dissipation caused by the leakage inductor of the transformer. Although the non dissipative snubber circuits and active-clamp circuits can be employed, the cost is increased due to the extra power switch and high side driver. High step-up voltage gain can be achieved by the use of the switched-capacitor and voltage-lift techniques. Coupled-inductor technique is used in converters to achieve a high step-up gain.the leakage inductor leads to a voltage spike on the main switch and affects the conversion efficiency so the converters using a coupled inductor with an active-clamp circuit have been proposed. An integrated boost flyback converter is in the secondary side of the coupled inductor is used as a flyback converter. It can increase the voltage gain. Additionally, the energy of the leakage inductor is recycled to the output load directly; limiting the voltage spike on the main switch and the voltage stress of the main switch can be adjusted by the turn ratio of the coupled inductor. To achieve a high step-up gain, it has been proposed that the secondary side of the coupled inductor can be used as flyback and forward converters. This paper proposes a novel high step-up ratio and clamp-mode converter. The proposed converter adds two capacitors and two diodes on the secondary side of the coupled inductor to achieve a high step-up voltage gain. The 51

2 coupled inductor can charge two capacitors in parallel and discharge in series. Passive clamping circuit is needed to clamp the voltage level of the main switch and to recycle the energy of the leakage inductor. 2. Proposed converter system Fig. 1 shows the circuit topology of the proposed converter, which is composed of dc input voltage Vin, main switch S, coupled inductors Np and Ns, one clamp diode D1, clamp capacitor C1, two capacitors C2 and C3, two diodesd2 andd3, output Diode Do, and output capacitor Co. The equivalent circuit model of the coupled inductor includes magnetizing inductor Lm, leakage inductor Lk, and an ideal transformer. The leakage inductor energy of the coupled inductor is recycled to capacitor C1, and thus, the voltage across the switch S can be clamped. The voltage stress on the switch is reduced significantly. Thus, low conducting resistance RDS(ON) of the switch can be used. The proposed converter combines the concept of switched-capacitor and coupled-inductor techniques. Additionally, the proposed converter puts capacitors C2 and C3 on the secondary side of the coupled inductor. Thus, capacitors C2 and C3 are charged in parallel and are discharged in series by the secondary side of the coupled inductor when the switch is turned off and turned on. Because the voltage across the capacitors can be adjusted by the turn ratio, the high step-up gain can be achieved significantly. Also, the voltage stress of the switch can be reduced. The proposed converter has low conduction loss. Moreover, the secondary-side leakage inductor of the coupled inductor can alleviate the reverserecovery problem of diodes, and the loss can be reduced. In addition, capacitors C2 and C3 to achieve a high step-up gain without an additional winding stage of the coupled inductor. Fig Circuit configuration of the proposed converter. The coil is less than that of other coupled inductor converters. The main operating principle is that, when the switch is turned on, the coupled-inductor-induced voltage on the secondary side and magnetic inductor Lm is charged by Vin. The induced voltage makes Vin, VC1, VC2, and VC3 release energy to the output in series. The coupled inductor is used as a transformer in the forward converter. When the switch is turned off, the energy of magnetic inductor Lm is released via the secondary side of the coupled inductor to charge capacitors C2 and C3 in parallel. The coupled inductor is used as a transformer in the flyback converter. To simplify the circuit analysis, the following conditions are assumed. 1) Capacitors C1, C2, C3, and Co are large enough. Thus, VC1, VC2, VC3, and Vo are considered as constants in one switching period. 2) The power devices are ideal, but the parasitic capacitor of the power switch is considered. 3) The coupling coefficient of the coupled inductor k is equal to Lm/(Lm + Lk), and the turn ratio of the coupled inductor n is equal to Ns/Np. 52

3 Fig Some typical waveforms of the proposed converter at CCM operation. 3. Simulation results The proposed converter simulation done through MATLAB and results are verified. SIMULINK is a software package for modelling, simulating and analyzing dynamic systems. It supports linear and non linear systems, modelled in continuous time, samples time, or a three stage of the two systems can also be multi rate, i.e., have different parts that are sampled or updated at different rates. As MATLAB and SIMULINK are integrated, we can simulate, analyze and revise our models in either environment at any point. Fig 3.1. High intensify interleaved converter 53

4 Fig. 3.2 shows the input voltage of 12V, which is obtained from solar MPPT. Fig 3.3 shows the pulse which is given to the MOSFET of intensify converter. Fig 3.4 high intensify converter output voltage and current Fig. 3.5 grid input voltage and current waveform 54

5 Fig. 3.6 THD VALUE in grid injection voltage 4. Conclusion This paper has proposed a high intensify interleaved converter using renewable energy resources for DG systems. By using the capacitor charged in parallel and discharged in series by the coupled inductor, high step up voltage gain and high efficiency are achieved and also total harmonic distortion will be 2.48 is achieved. The steady state analyses have been discussed and simulation results verified in detail. References [1] Y. Li, D. M. Vilathgamuwa, and P. C. Loh, Design, analysis, and realtime testing of a controller for multibus microgrid system, IEEE Trans.Power Electron., vol. 19, no. 5, pp , Sep [2] C. L. Chen, Y. Wang, J. S. Lai, Y. S. Lee, and D. Martin, Design of parallel inverters for smooth mode transfer microgrid applications, IEEE Trans. Power Electron., vol. 25, no. 1, pp. 6 15, Jan [3] A. Timbus, M. Liserre, R. Teodorescu, P. Rodriguez, and F. Blaabjerg, Evaluation of current controllers for distributed power generation systems, IEEETrans.Power Electron., vol. 24, no. 3, pp ,Mar [4] Y. A.-R. I. Mohamed and E. F. El Saadany, Hybrid variable-structure control with evolutionary optimum-tuning algorithm for fast grid-voltage regulation using inverter-based distributed generation, IEEE Trans.Power Electron., vol. 23, no. 3, pp , May [5] Y. A.-R. I. Mohamed and E. F. El Saadany, Adaptive decentralized droop controller to preserve power sharing stability of paralleled inverters in distributed generation microgrids, IEEE Trans. Power Electron., vol. 23, no. 6, pp , Nov [6] Y. W. Li and C.-N. Kao, An accurate power control strategy for powerelectronics-interfaced distributed generation units operating in a low voltage multibus microgrid, IEEE Trans. Power Electron., vol. 24, no.12,pp ,Dec

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