Performance of medium voltage dc-bus pv system architecture utilizing high-gain dc–dc converter To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Performance of Medium-Voltage DC-Bus PV
System Architecture Utilizing High-Gain
DC–DC Converter
Abstract
Introduction:
Currently, large-scale PV systems interface to the grid via
central or multistring inverter configurations. Nevertheless,
mismatch power losses from the limitation of single maximum
power point tracking (MPPT), particularly under partial shading
conditions, and the power losses from the reverse-current
blocking diodes degrade the efficiency of this PV configuration.
The multistring configuration introduces dc–dc converters
between the PV array and the inverter. Most commercial
multistring PV inverters place dc–dc converters inside the same
casing, and their power range is between 5 and 20 kW. The
additional power converter allows each PV array to be operated
at its maximum power point (MPP), which greatly increases the
overall MPPT efficiency. A higher MPPT efficiency will
outweigh the increased cost of the additional power conversion

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stage. A central PV inverter configuration for direct medium-
voltage connection has been commercialized. Although the
efficiency is increased and overall costs are lowered by
achieving MV grid integration with only one step-up
transformer, the inverter includes an MV-level transformer with
a high turns ratio.
Existing system:
Conventional step-up converters, such as the boost
converter and flyback converter, cannot achieve a high step-up
conversion with high efficiency because of the resistances of
elements or leakage inductance; also, the voltage stresses are
large. A boost converter (step-up converter) is a DC-to-DC
power converter with an output voltage greater than its input
voltage. It is a class of switched-mode power supply (SMPS)
containing at least two semiconductors (a diode and a transistor)
and at least one energy storage element, a capacitor, inductor, or
the two in combination. Filters made of capacitors (sometimes in
combination with inductors) are normally added to the output of
the converter to reduce output voltage ripple.
Proposed system:

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The PV system architecture contains three identical PV
arrays, one step-up transformer and two power conversion
stages: a dc–dc stage using SSIB converters and a dc–ac stage
using a voltage source converter (VSC). The PV array contains
several parallel connected PV strings consisting of many PV
panels connected in series. A conventional inverter consisting of
a VSC with sinusoidal pulse width modulation (PWM) and a
delta-wye (Δ − Y) MV-level transformer is considered in this
paper. Three identical SSIB converters transfer the power
generated by each PV array to a common MV dc bus. At the
same time, each SSIB converter controls the output voltage of
their associated PV array. The voltage of theMV dc bus is
controlled by the inverter, thus transferring all the available
power to the electricity grid via an MV-level transformer.

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Mail : projects@lemenizinfotech.com
Advantages:
 Input current ripple is decreased.
 Increasing the power rating of the converter.
Applications:
 Photovoltaic (PV) systems.

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
INPUT
DC supply
Interleaved boost converter
with voltage doubler cells Load
OPTO Isolator
circuit
BUFFER
circuit
PIC controller
circuit
5VDC
12 V
DC

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.