ABSTRACT:
This paper presents a solar power based two level inverter
fed sensorless induction motor drive (SIMD) with space vector modulation based
direct torque and flux control (DTFCSVM) for the water pumping applications.
Due to the robustness and the flexible operating characteristics, induction
motor is most suitable for water pump system. The back emf based model reference
adaptive system (MRAS) is used to estimate the speed of the motor. This
sensorless MRAS based speed estimation technique is independent to the changes
in the temperature and it makes the system simple, robust and economic.
Moreover, it reduces the complexity while implementing the hardware setup. DC/DC
boost converter along with perturb and observe method of maximum power point
tracking (MPPT) control technique is employed to draw sophisticated power from
the solar photovoltaic (PV) array. The DTFC-SVM of an IMD using basic two level
inverter is proposed for water pumping application. The proposed method is
simulated in MATLAB/SIMULINK environment and simulated results are presented
under various operating conditions.
KEYWORDS:
1.
Direct torque and flux control
2.
Sensorless induction motor drive
3.
Space vector modulation
4.
Photovoltaic array
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1. Schematic model of DTFC-SVM of
sensorless IMD
EXPECTED SIMULATION RESULTS:
Fig.2. Results under no-load torque
operating condition using basic two level
inverter: Plot (from top to bottom): (i)
Torque, (ii) stator current, (iii) speed,
(iv)stator flux qd-components in
stationary reference frame.
Fig.3. Loading performance at 1400rpm
using basic two level inverter: (i)
Torque, (ii) speed, (iii) stator current
and (iv) error speed,(v) error speed
between actual and estimated speed of
motor,(vi) stator fluxes.
Fig.4. Reversal speed Performance using
basic two level inverter: (i) Torque,
(ii) speed, (iii) stator current and
(iv) stator flux qd-components.
CONCLUSION:
It has been concluded that the solar
power based basic two level inverter fed sensorless induction motor drive with
DTFC-SVM using proportional-integral controller (PIC) is simple,robust,reduces
the complexity while desgningthe hard ware setup hence it is quite suitable for
the water pumping applications. The solar panel has been operated at the peak
values of voltage, current and power by using a simple perturb and observe method
of MPPT algorithm, and the required DC output voltage achieved by using DC/DC
boost converter. From the simulation results we can conclude that the basic two
level-SVM based sensorless IM drives can provide good performance and less
ripple content in torque , fluxes.
REFERENCES:
[1] G. S Buja and
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[3] Tejavathu Ramesh, Anup
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Singh. "MRAS based speed estimation of single stage solar powered vector
controlled induction motor drive for water pumping." Power India
International Conference (PIICON), 2016 IEEE 7th. IEEE, 2016.
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Singh. "Single Stage PV Array Fed Speed Sensorless Vector Control of
Induction Motor Drive for Water Pumping." IEEE Transactions on Industry
Applications (2018).
