This document proposes a two-stage grid-connected photovoltaic inverter system for residential use with maximum power point tracking. It consists of a DC-DC boost converter and an H-bridge inverter. The inverter uses sinusoidal pulse width modulation and a square wave switching strategy along with grid synchronization. Simulation results show the inverter can efficiently convert solar power to grid-compatible AC power with low voltage total harmonic distortion. It demonstrates maximum power point tracking and the ability to supply power to the grid with near unity power factor.

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Single Phase Grid-Connected Photovoltaic Inverter for
Residential Application with Maximum Power Point
Tracking
ABSTRACT:
This article proposes a topology for single-phase two stage grid connected solar photovoltaic
(PV) inverter for residential applications. Our proposed grid-connected power converter consists
of a switch mode DC-DC boost converter and a H-bridge inverter. The switching strategy of
proposed inverter consists with a combination of sinusoidal pulse width modulation (SPWM)
and square wave along with grid synchronization condition. The performance of the proposed
inverter is simulated under grid-connected scenario via PSIM. Furthermore, the intelligent PV
module system is implemented using a simple maximum power point tracking (MPPT) method
utilizing power balance is also employed in order to increase the systems efficiency.
 Photovoltaic
 DC-DC Boost Converter
 MPPT
 SPWM
 Square Wave
 Power Electronics
 Grid Tie Inverter(GTI)
SOFTWARE: MATLAB/SIMULINK
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KEYWORDS:
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BLOCK DIAGRAM:
Fig 1. Block diagram of two-stage grid-connected PV system
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EXPECTED SIMULATION RESULTS:
Figure 2. Output voltage of the inverter without filtering Figure 3. Output current of the inverter
Figure 4. Output voltage after connected to grid Figure 5. Output real power
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Figure 6. Output voltage’s FFT (a) before filtering and (b) after filtering
CONCLUSION:
The main purpose of this paper is to establish a model for the grid-connected photovoltaic system with
maximum power point tracking function for residential application. A single phase two-stage grid-connected
photovoltaic inverter with a combination of SPWM and square-wave switching strategy is
designed using PSIM. In the proposed design, an MPPT algorithm using a boost converter is designed to
operate using (P&O) method to control the PWM signals of the boost converter, which is adapted to the
maximum power tracking in our PV system. Instead of using line frequency transformer at the inverter
output terminals, a DC-DC boost converter is used between solar panel and inverter that efficiently
amplify the 24V PV arrays output into 312V DC, which is then transformed into line frequency (50Hz)
sinusoidal ac 220V rms voltage by the inverter and thereby reducing the system losses and ensures high
voltage gain and higher efficiency output. The simulation results show that the proposed grid connected
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photovoltaic inverter trace the maximum point of solar cell array power and then converts it to a high
quality ripple free sinusoidal ac power with a voltage THD below 0.1% which is very much lower than
IEEE 519 standard. The simulation also confirms the proposed photovoltaic inverter can be applied as a
GTI and able to supplies the AC power to utility grid line with nearly unity power factor.
REFERENCES:
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[8] N. Mohan, T. M. Undeland, & W. Robbins, Power Electronics, 3rd ed., Denvers, MA: John
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[9] M. H. Rashid, Power Electronics, Circuits, Devices, and Applications, 3rd ed. New Delhi:
Prentice-Hall of India Private Limited, 2007 pp.253-256.
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