This document proposes a system using a photovoltaic array, maximum power point tracking, and a Z-source inverter to power a sensorless brushless DC motor. A PV array extracts solar energy and MPPT control maximizes the output power. A Z-source inverter can boost the PV voltage and supplies power to the BLDC motor. Simulation results show the system can successfully operate under different conditions and regulate motor speed while maximizing solar energy harvesting. The system has advantages of fewer power switches, smaller capacitors/inductors, and fast dynamic response compared to conventional PV systems.

1. PV Power System Based MPPT Z-
Source Inverter to Supply a
Sensorless BLDC Motor
Guide, Submitted by,
Mr. Manu N Govind Renjith Chandran Nair
Asst: Prof Dept of EEE S7 EEE,
MCET PTA Roll No:4431
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2. • The solar energy as PV power systems can be operated as a stand-
alone, hybrid or grid connected systems.
• Photovoltaic (PV) water pumping systems have been increasingly
popular in remote areas where grid is not accessible or is too costly
to install.
• PV pumps are already in use in several parts of the world. But they
suffer from maintenance problems due to brushes and commutator .
• The problems can be overcome by choosing BLDC motor.
Introduction
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3. CONTENTS
• Photovoltaic System
• Conventional PV water pumping system
• Maximum Power Point Tracking(MPPT)
• ZSI
• BLDC motor
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4. Description Of The Components
PV cell
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5. BLDC MOTOR
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• A BLDC motor is a rotating electric machine where the stator
is a classic three phase stator like that of an induction motor
and the rotor has surface mounted permanent magnets.
• Also called brushless Permanent Magnet DC (BLDC) or
synchronous DC motor
• The construction of modern brushless motors is very similar to
the ac motor, known as the permanent magnet synchronous
motor.

7. Z-Source Inverter
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8. • Z-source inverter (ZSI), which is based on Z-source
network .It can be used to buck and boost the output AC
voltage, which is not possible using traditional voltage
source or current source inverters.
• Figure shows a topology of the single phase Z-source
inverter.
• The impedance network is placed between the power
source and the single phase inverter.
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9. Sensorless BLDC motor driven by 3 Phase ZSI
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10. • The maximum power of PV array is extracted by MPPT
control method and then is fed to the sensor less BLDC motor.
• PV power varies to different environment conditions.
• The sensor less BLDC motor should be driven by variable
reference speed. In order to achieve the reference speed for
sensor less BLDC motor, the input voltage of inverter is
regulated at a constant value (Vinref=300V).
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11. Equivalent circuit of PV solar cell
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12. • Figure illustrate the nonlinear variations of the PV maximum
power point respect to irradiation levels.
• The voltage and current of a PV array vary in respect to
insolation and temperature levels, the equation has been
computed for several insolation levels
• In this paper PV system is modelled in the PSCAD program as
a DC voltage source based on equation.
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13. Output Characteristics of PV module
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14. BLDC MOTOR DRIVE
• Permanent magnet DC motors use mechanical commutator and
brushes to achieve the commutation.
• It has rotor and stator
• BLDC motors use permanent magnets instead of coils in the
armature and so do not need brushes.
• It has hall effect sensors.
• Sensor detects the rotor position by incremental encoder then it
is removed.
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15. Back EMF pattern
and reference current
generation
• va, vb, vc- phase
voltages.
• ia, ib, ic-phase currents.
• ea, eb, ec-phase back
EMF waveforms.
• R-phase resistance.
• L-self inductance of
each phase.
• M-mutual inductance
between any two phases
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16. • VC1 and VC2-capacitors
voltages
• B is the boost factor of ZSI.
• Vd and VO- input and
output
• voltages of impedance
network.
OPERATION PRINCIPLES
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17. CONTROL SYSTEM DESCRIPTION
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18. • Fig. describes the basic building blocks of PV array MPPT
control and the sensorless BLDC motor drive.
• The drive system consists of the PI speed controller, reference
current generator, hysteresis current controller, three-phase
ZSI and the motor-load unit.
• First the reference voltage of PV array is determined by the IC
MPPT controller and compared with the PV array voltage.
• The motor currents are compared with the reference currents
and the hysteresis current controller regulates the winding
currents (ia, ib, ic) within the small band around the reference
currents. These switching commands and the Z-Source
switching commands are ORed to drive inverter switches.
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19. SIMULATION RESULTS
• The proposed system was simulated by PSCAD/EMTDC to
evaluate the system capability in response to different
operation conditions.
• It has three different operating conditions.
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21. ADVANTAGES
• Less power switches.
• Smaller capacitance.
• Smaller inductance.
• Fast dynamic response
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22. CONCLUSION
• This paper proposes a sensor less BLDC motor supplied by PV
array based on ZSI.
• Conventional PV systems needing two stages of power
converters the proposed system has employed just a three
phase ZSI extracting the maximum power of PV array and
driving a sensor less BLDC motor simultaneously for different
operation conditions.
• Less power losses, rapid tracking of MPPT and low
electromagnetic torque ripple, demonstrating high current
control capability.
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23. REFERENCES
1. M. G. Jabori, “A contribution to the simulation and design
optimization of photovoltaic systems,” IEEE Trans. on EC, vol.
6, no.3, 1991, pp. 401-406.
2. J. Samin and et al, “optimal sizing of Photovoltaic Systems in
Varied Climates,” Elsevier , Solar Energy, vol. 6, No. 2, 1997,
pp.97-107.
3. Z. Zinge, “Optimum Operation of a Combined System of a
Solar Cell Array and a DC Motor,” IEEE Trans. on PAS, vol.
pas-100, no. 3, 1981,pp. 1193-1197.
4. F. Z. Peng, ‘‘Z-source inverter,’’ IEEE Trans. Ind. Appl., vol. 39,
no. 2,pp.504-510, Mar.-April. 2003.
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