A Novel High-Gain Soft-Switching DC-DC Converter With Improved P&O MPPT for Photovoltaic Applications

ABSTRACT:

This paper proposes a novel high voltage gain structure of DC-DC converter with soft-switching ability for photovoltaic (PV) applications. A small size coupled inductor with one magnet core is utilized to improve the voltage conversion ratio in the proposed converter. The converter has one active MOSFET with low conducting resistance (RDS􀀀ON ), which in turn reduces the conduction losses and complexity of the control section. Due to the low input current ripple, the lifetime of the input PV panel is increased, and the maximum power point (MPP) of the PV panel can be easily tracked. The MOSFET's zero-voltage and zero-current switching and diodes are the other countenance of the proposed converter, which improve its efficiency. Additionally, an improved Perturb and Observe MPP tracking (IP&O MPPT) algorithm is introduced to boost the extracted power of the input PV sources. To validate the performance of this converter, the operation modes principle, steady-state and efficiency survey, and comparison results with other same family converters are carried out. Finally, an experiential prototype is built with 20 V input, 200 V output, power rate of 200W, and 50 kHz operating frequency to validate the mathematical analysis and effectiveness of the proposed structure. The efficiency of the proposed converter was estimated by over 95% at various power levels.

KEYWORDS:

1.      Perturb and observe algorithm

2.      Dc-dc converter

3.      Photovoltaic

4.      MPPT

5.      Zero current switching

6.      High efficiency

SOFTWARE: MATLAB/SIMULINK

SCHEMATIC DIAGRAM:

 

 

Figure 1. Schematic Diagram Of The Non-Isolated High Step-Up Dc-Dc Converter For Pv Applications.

 

Figure 2. Structure Of The Proposed High Step-Up Dc-Dc Converter For Pv Systems.

 

EXPECTED SIMULATION RESULTS:

Figure 3. Simulation Result Of The Capacitor Voltages.

 

Figure 4. Simulation Result Of The Capacitor Voltages Of The Proposed Converter, (A) Vo-Vin, (B) Iin.

 

Figure 5. Simulation Result Of The Capacitor Voltages Proposed, (A) Vd1-Id1, (B) Vd2-Id2, (C) Vdo-Ido And (D) Vsw -Isw:

CONCLUSION:

This paper proposed a novel structure of non-isolated DC-DC converter with high voltage gain and soft-switching capability for PV applications. The presented converter benefits from 1) high voltage gain, 2) low input current ripple, 3) high efficiency, 4) simple structure, 5) peak voltage throughout the semiconductor components and 6) low components count. In the presented non-isolated DC-DC converter, a small size and cost coupled inductor with one magnet core is used to increase the voltage conversion ratio. The suggested topology has only one active MOSFET with lower conducting resistance (RDS􀀀ON ), which can decrease the control section's conduction losses and complexity. Due to the low input current ripple, the lifetime of the input PV panel is increased and the MPP of the PV panel can be easily tracked. Soft switching conditions include ZVS and ZCS of power MOSFET, and diodes are the other features of the proposed converter which improve efficiency. Additionally, an improved P&O MPPT algorithm is suggested to increase the extracted power from the input PV sources. In the rest of this paper, to verify the performance of the suggested converter, the operation modes principle, steady-state and efficiency calculation, and comparison results with other similar converters are provided. The outcomes of this study proved the theoretical analysis and the efficiency of higher than 95% at different power levels.

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