INTEGRATION AND OPERATION OF A SINGLE
PHASE BIDIRECTIONAL INVERTER WITH TWO
BUCK/BOOST MPPTS FOR DC-DISTRIBUTION
APPLICATIONS
Abstract:
Many types of renewable energy, such as photovoltaic (PV), wind, tidal, and geothermal
energy, have attracted a lot of attention over the past decade. Among these natural resources, the
PV energy is a main and appropriate renewable energy for low-voltage dc-distribution systems,
owing to the merits of clean, quiet, pollution free, and abundant. In the dc-distribution
applications, a power system, including renewable distributed generators (DGS), dc loads
(lighting, air conditioner, and electric vehicle), and a bidirectional inverter, is shown in fig. 1, in
which two PV arrays with two maximum power point trackers (MPPTS) are implemented.
However, the I–V characteristics of the PV arrays are nonlinear, and they require MPPTS to
draw the maximum power from each PV array. Moreover, the bidirectional inverter has to fulfill
grid connection (sell power) and rectification (buy power)with power-factor correction (PFC) to
control the power flow between dc bus and ac grid, and to regulate the dc bus to a certain range
of voltages, such as 380 ± 10 v.
Nowadays, a conventional two-stage configuration is usually adopted in the PV inverter
systems. Each MPPT is realized with a boost converter to step up the PV-array voltage close to
the specified dc-link voltage. The boost converter is operated in by-pass mode when the PVarray voltage is higher than the dc-link voltage, and the inverter will function as an MPPT.
The Light Dependent Resistor (LDR) 1 senses the change in the sun’s position and gives
signal to the control circuit in order to tackle the change in the position of the solar panel. The
control circuit gives signal to run the motor in forward direction. LDR 2 detects the sun set and
gives signal to the control circuit to run the motor in reverse direction until the proxy switch gets
activated. The position of the panel will be displayed in LCD at which LDR is absorbing the
COASTAL PROSOFT PVT. LTD.
15D, IDA Phase II, ADB Road, Peddapuram 533 437, India
8-1-329/1/O/307 O. B., Toli chowki, Hyderabad 500 008, India
Mobile- +91-9866181101, E-Mail - info@cprosoft.com
energy from the sun. the output from the panel we boost using the DC-DC booster and store in
the battery through the super capacitor for the function of uniform storage purpose.
Existing system:
In the past years numerous MPPT algorithms have been published. They differ in many
aspects such as complexity, cost or efficiency. To date, a number of MPPT algorithms have been
proposed in the literature, including perturb-and- observe method (2004), open- and short-circuit
method (2002), incremental conductance algorithm (1998),fussy logic (2006) and artificial
neural network (1998). However, it is pointless to use a more expensive or more complicated
method if with a simpler and less expensive one similar results can be obtained. This is the
reason why some of the proposed techniques are not used. The main technical requirements in
developing a practical PV system include which an optimal control that can extract the maximum
output power from the PV arrays under all operating and weather conditions.
Proposed system:
This paper presents the hardware design and implementation of a system that ensures a
perpendicular profile of the solar panel with the sun in order to extract maximum energy falling
on it. Renewable energy is rapidly gaining importance as an energy resource as fossil fuel prices
Fluctuate. The unique feature of the proposed system is that instead of taking the earth as its
reference, it takes the sun as a guiding source. Its active sensors constantly monitor the sun
radiation and rotate the panel towards the direction where the intensity of sunlight is high.
.
COASTAL PROSOFT PVT. LTD.
15D, IDA Phase II, ADB Road, Peddapuram 533 437, India
8-1-329/1/O/307 O. B., Toli chowki, Hyderabad 500 008, India
Mobile- +91-9866181101, E-Mail - info@cprosoft.com
Block diagram:
LCD
LDR1
TRACKING
(LEFT)
MECHANISUM
LDR2
ADC
(CENTER)
ATMEL
DC-DC
BOOSTER
LDR 3
(RIGHT)
SUPER
CAPACITOR
BATTERY
LAMP
RELAY
INVERTER
COASTAL PROSOFT PVT. LTD.
15D, IDA Phase II, ADB Road, Peddapuram 533 437, India
8-1-329/1/O/307 O. B., Toli chowki, Hyderabad 500 008, India
Mobile- +91-9866181101, E-Mail - info@cprosoft.com
HARDWARE REQUIREMENTS

MICROCONTROLLER

SOLAR PANEL

LCD

ADC

LDR

DC-DC BOOSTER

SUPER CAPACITOR

BATTERY

INVERTER

RELAY
SOFTWARE REQUIREMENTS

KEIL CROSS COMPILER.

EMBEDDED C
Advantages:




Easy tracking System.
Maximum Range tracking
Maximum power output compares other technique.
No wastage in product.
Disadvantages:
 Complexity algorithms
 difficult and unsatisfactory
 It’s not trusted one
COASTAL PROSOFT PVT. LTD.
15D, IDA Phase II, ADB Road, Peddapuram 533 437, India
8-1-329/1/O/307 O. B., Toli chowki, Hyderabad 500 008, India
Mobile- +91-9866181101, E-Mail - info@cprosoft.com