A Non-Isolated Dc-Dc Converter Fed PM-BLDC Motor Drive For Water-Pumping System With Single Sensor.pdf

NEUROQUANTOLOGY | AUGUST 2022 | VOLUME 20 | ISSUE 10 | PAGE 8905-8912| DOI: 10.14704/NQ.2022.20.10.NQ55874
Ananda Babu Kancherla / A NON-ISOLATED DC-DC CONVERTER FED PM-BLDC MOTOR DRIVE FOR WATER-PUMPING SYSTEM WITH
SINGLE SENSOR
www.neuroquantology.com
eISSN 1303-5150
8905
A Non-Isolated Dc-Dc Converter Fed PM-BLDC Motor Drive
For Water-Pumping System With Single Sensor
Ananda Babu Kancherla1
,
PhD Scholar1,
Mail Id : akancherla@giet.edu,
Department of Electrical & Electronics Engineering,
Gandhi Institute of Engineering & Technology Gunpur, Odisha,India.
Dr.N.Bhanu Prasad2,
Professor2,
Mail id :bhanuprasad.n@gmail.com,
Gandhi Institute of Engineering & Technology Gunpur, Odisha,India.
Dr.D.Ravi Kishore3,
HOD3,
Mail id :dravikishore@gmail.com,
Godavari Institute of Engineering & Technology Rajahmundry,A.P,India.
Abstract.
Because of their many useful characteristics, such as security, plenty, quality, quietness, and so on, RES are put to use in a wide
range of contexts. These days, solar photovoltaic (PV) energy production is increasingly used in irrigation systems. Power
conditioning components, such as a high-voltage-gain DC-DC converter and a (VSI) Voltage-Source Inverter, link the solar-PV
system to the autonomous water-pumping system. The circuitry and cost of the controller increase due to the need of sensing the
rotor's position in order to measure its speed, phase currents, and target speeds. In this setup, power for the SPV system and PM-
BLDC drive is provided by a non-isolated dc-dc boost converter. Fewer sensors are needed for the suggested cutting-edge control
module. As an added bonus, Matlab/Simulink is used to assess and contrast the motor's reactivity to variations in acceleration,
deceleration, and applied torque.
Keywords: DC-DC Converter.Solar PV System.PM-BLDC.Sensors.
DOI Number: 10.14704/nq.2022.20.10.NQ55874 NeuroQuantology 2022; 20(10): 8905-8912
Introduction
In recent years, renewable energy sources have
become more important to water pumping
systems. Energy harvested from non-
conventional sources, including the sun, the
wind, or other forms of nature, is known as
renewable energy (WES). Solar photovoltaic
power production from renewable energy
sources (RES) stands out as the greatest
alternative for powering irrigation systems due
to its numerous benefits (non-toxicity, plenty,
virtue, quiet, etc.). These water-pumping
systems are particularly suited to our dynamic
environment since PM-BLDC motors are often
used in industrial automation for traction,
robotics, or aerospace and need increased power
and intelligence.
Typical boost DC-DC converters have several
drawbacks, including poor efficiency, large
switching losses, large current ripples, and high
duty ratios that amplify dv/dt stress. So that we
may address this problem, our group has been
investigating alternative designs for high-step-
up DC-DC boost converters. By increasing
voltage gain, reducing dv/dt stress, and
minimizing switching losses, the suggested new
converter ameliorates the inefficiencies of the
conventional converter.
As shown in Figure 1, a solar photovoltaic (PV)
PM-BLDC drive operates on DC current.
Fig.1 Schematic Diagram of RES Integrated PM-BLDC
Drive Scheme for Water-Pumping System
Proposed System
The many benefits of non-isolated or interleaved
type boost converters, such as high efficiency,
low EMI loss, low switch stress, and low duty
ratios, make them suitable for a wide range of
applications. It may reduce I2R losses and take
the place of "N-phase" components because to
its compact design and modular construction. In

SINGLE SENSOR
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addition to being more efficient than standard
DC-DC boostconverters, systems with
interleaved inductors have substantially less
source current ripple.
Fig.2 Diagrammatical View of Non-Isolated DC-DC Boost
Converter
In order to convert a high input current into a
high output voltage, "non-isolated DC-DC
converters" with two phases are often utilized.
The phase-displacement range of two-phase
DC-DC converters is 180 degrees, whereas that
of three-phase systems is just 120 degrees. The
phase-displacement angle is calculated by
subtracting 360 degrees from the number of
phases, N. (N- number of phases). A simple
two-phase DC-DC converter circuit is shown in
Figure 2.
WORKING MODES
Non-isolated DC-DC boost converters cycle
power across the magnetic field channel,
increasing the inductors' tolerance for current
fluctuation. These converters take in a DC
voltage and output a DC voltage that is higher.
In Fig. 3, the various modes of operation of the
proposed non-isolated DC-DC boost converter
are shown.
At time t=0 in Mode-A, the gate-pulse signals
turn on switch Sa1 in phase-1, while they turn
off switch Sa2 in phase-2. While the current
through inductor L1 is linearly increased, the
current through inductor La2 is cut off. To keep
the load voltage at Vo constant, diode Da2
works in conjunction with inductor La2 to
charge capacitor Cdc. The workings of a mode
are seen in Fig.4.3 (a). A change in current via
inductor La2 is represented by symbols.
In Mode-B, the gate pulse signals are applied to
switch Sa2 during phase 2 and removed from
switch Sa1 during phase 1 at time tt1. When L1
is turned off, I2 rises linearly since L2 is now
active. The load is supplied with electricity
through the diode Da1 and charged by the
capacitor Cdc in series. The voltage across the
load is maintained constant at Vo thanks to this
setup. The operation of mode B is seen in Fig. 3.
(b). As current travels from inductor La1 to the
load through diode Da1, the DC connection
capacitor Cdc is charged. This procedure
maintains a constant load voltage of Vo. The B
mode of operation is shown in Figure 3. (b). For
an inductor La1 supplying a steady current, the
symbol for the circuit is
(a) Mode-A

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Mode-B
Fig.3 Non-Isolated DC-DC Boost Converter Working
Modes
Waveforms typical of those generated by the
proposed boost converter are seen in Figure 4.
Inductors La1 and La2 slow the rate at which
the currents change, so the output voltage
remains stable. Therefore, a significant voltage
boost load may be possible.
Fig.4 Proposed Non-isolated type DC-DC Boost Converter
Waveforms
Fig.5 Solar-PV Fed Non-isolated DC-DC Boost Converter
with Attractive Control Strategy Schematic Diagram
The VSI interface connects the "non-isolated
type DC-DC boost converter" output DC
voltage to the PM- BLDC drive. This VSI
interface, in response to a signal from a
decoding circuit, modulates the current across
the stator windings, therefore commuting the
PM-BLDC motor. Energy from the PV system
is increased in voltage through a non-isolated
DC-DC converter before it reaches the VSI
interface. Using a control target with a high
voltage gain factor, the "non-isolated DC-DC
converter" may maintain a constant output
voltage. When the output voltage of a non-
isolated converter is compared to a stable
supply, an error sequence is generated. Common
applications of Proportional-Integral (PI)
controllers include providing a reference signal
and regulating error sequences in voltage
components. In order for non-isolated DC-DC
converters to keep performing adequately in the
face of unplanned disturbances like those caused
by solar-PV systems, the acquired reference
signal is utilized in combination with a saw
tooth carrier signal to feed switching states to
switches. The control scheme of a "non-
isolatedDC-DC converter" is shown in Figure 5.
2.1 Speed Control Strategy Of Proposed
Solar-Pv Fed Non-Isolated Dc-Dc Converter
Driven Pm-Bldc Drive Using Single Sensing
Elements
A unique control technique based on a single

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sensing element has been devised to overcome
the limitations of the traditional boost converter
and allow for the achievement of target speeds
regardless of external conditions.
In order to reach the desired speeds with the
PM-BLDC motor, a unique control mechanism
is necessary. Altering the DC voltage at the
VSI's input is the most fundamental approach
for regulating the rotational speed of an electric
motor. Here, the VSI is linked to the DC-DC
converter's output, and the VSI regulates the
DC-DC converter's output voltage based on the
chosen control goals. This PM-VSI BLDC uses
a Hysteresis Current Controller to generate its
switching states (HCC). Besides the measured
voltage, there also has to be an applied voltage.
When the output voltage of the converter is
compared to the reference voltage signal, a
number of mistakes are made. The PI controller
may be used to lessen the effects of these fault
sequences and to provide useful reference
signals.
When designing a non-isolated DC-DC
converter, the produced reference signal is
utilized to supply switching states for the
converter's switches, enabling the converter to
achieve the required speeds. This signal is
associated with a sawtooth carrier signal. To
determine the torque at varying rotational
speeds, the viable switching states are employed
to power the VSI interface and energize the
stator windings. The PM-BLDC motor's speed
may be varied across a wide range by changing
the duty ratio of the DC-DC converter based on
information from a single sensor. The whole
system is shown in Fig. 6; it consists of a Solar
PV-based Non-Isolated DC-DC boost converter
that provides power to a PM-BLDC drive that
uses single-element sensors.
Fig.6 Over-all System of Solar-PV Based Non-Isolated
DC-DC Boost Converter Fed PM-BLDC Drive using
Single-Sensing Element
MATLAB/SIMULINK
RESULTS & DISCUSSION
Matlab/Simulink is used to simulate the
proposed "non-isolated converter fed with PM-
BLDC motor drive" from an SPV system under
varying speed conditions (incremental and
decremental).
Table.1 Operating Parameters
Spv Fed Pm-Bldc Drive Using Proposed Non-
Isolated Dc-Dc Converter Employing Single
Sensing Element

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Solar-PV Output Voltage
DC Output Voltage
Stator Current
Back EMF
Rotor Speed
Electromagnetic Torque
Fig.7.Simulation Results of PM-BLDC Drive
Using Single Sensors under Incremental
Speed Conditions (Reference DC Output
Voltage)
Table following shows the results of testing a
solar-PV supplied PM-BLDC drive at several
speeds (from 1500 rpm to 2500 rpm). 2
Table.2
DC Output Voltage
Stator Current

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Back EMF
Rotor Speed
Fig.8 Simulation Results of PM-BLDC Drive Using Single
Sensors under Decremental Speed Conditions (Reference
DC Output Voltage)
The performance evaluation of solar-PV fed
PM-BLDC drive under decremental speed
condition (varies 2500 rpm to 1500 rpm) is
illustrated in the below Table:3
DC Output Voltage
Stator Current
Back EMF
Rotor Speed
Fig.9 Simulation Results of PM-BLDC Drive Using Single
Sensor under Variable Torque Conditions
The performance evaluation of solar-PV fed
PM-BLDC drive under Variable Torque
condition is illustrated in the below Table:4

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Table.4
Table.5 Comparison of Conventional and
Proposed Non-Isolated DC-DC Boost
Converter
Input and Output Voltages
Voltage Gain & Current Ripples
Fig.10.Graphical View of Performance Analysis of
Conventional DC-DC Boost Converter and Proposed Non-
Isolated DC-DC Boost Converter
As shown in Table 5, the proposed state-of-the-
art DC-DC converter differs significantly from
the traditional boost converter. On the other
hand, the typical DC-DC converter takes in a
high voltage of 200V, as that produced by solar-
PV arrays, and produces a DC voltage of 400V
with a gain of just 2%. The advantages of solar
photovoltaic arrays include their inexpensive
initial cost, simplicity of installation, and
flexibility in terms of siting. Current ripples in
conventional DC-DC boost converters are 1.39
percent, but those in the cutting-edge boost
converter we propose are just 0.6 percent. A
variety of factors cause the proposed non-
isolated DC-DC boost converter to outperform
its isolated counterpart. Figure10 presents a
graphical representation of the analysis findings
for the suggested converter.
Conclusion
Positive performance numbers under both
variable speed and variable torque scenarios
have spurred demands for additional inquiry
into the proposed technology. The suggested
innovative converter improves upon the status
quo by increasing the input voltage from 150 to
400V with a gain of 2.7% via the use of a
closed-loop control system to guarantee
precision and uniformity in the final product.
The outcomes of Matlab/Simulink simulations
are shown. Low duty ratios are all that are
required for high step-up gain, which eases the
load on the dv/dt switch, decreases current
ripples, lessens switching losses, and boosts
efficiency. The approach was approved after
extensive testing proved its efficacy in water
pumping system scenarios. If the proposed
converter were utilized with just three sensing
devices, the circuit's size and complexity may be
cut in half or more.
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