ABSTRACT:
This
paper presents the design and implementation of Modular Multilevel Inverter
(MMI) to control the Induction Motor (IM) drive using intelligent techniques
towards marine water pumping applications. The proposed inverter is of eleven
levels and has the ability to control the speed of an IM drive which is fed
from solar photovoltaics. It is estimated that the energy consumed by pumping
schemes in an onboard ship is nearly 50% of the total energy. Considering this
fact, this paper investigates and validates the proposed control design with
reduced complexity intended for marine water pumping system employing an
induction motor (IM) drive and MMI. The analysis of inverter is carried out
with Proportional-Integral (PI) and Fuzzy Logic (FL) based controllers for
improving the performance. A comparative analysis has been made with respect to
better robustness in terms of peak overshoot, settling time of the controller
and Total Harmonic Distortion (THD) of the inverter. Simulations are undertaken
in MATLAB/Simulink and the detailed experimental implementation is conducted
with Field Programmable Gate Array (FPGA). The results thus obtained are
utilized to analyze the controller performance, improved inverter output
voltage, reliable induction motor speed control and power quality improvement
by reduction of harmonics. The novelty of the proposed control scheme is the
design and integration of MMI, IM drive and intelligent controller exclusively
for marine water pumping applications.
KEYWORDS:
1. Field
programmable gate array
2. Fuzzy
logic controller
3. Induction
motor drive
4. Modular
multilevel inverter
5. Proportional-integral
6. Total
harmonic distortion
SOFTWARE: MATLAB/SIMULINK
SCHEMATIC DIAGRAM:
Figure 1. Schematic Diagram Of
The Proposed 11-Level Inverter.Aq
EXPECTED SIMULATION RESULTS:
Figure 2. Speed Response Of Pi Controller At 1000
Rpm.
Figure 3. Speed Response Of Flc At 1000 Rpm.
Figure 4. Harmonic Analysis With Pi Controller.
Figure 5. Harmonic Analysis With Fl Controller.
Figure 6. Output Voltage Waveform
Of An 11 Level Inverter.
CONCLUSION:
The
relevance of the proposed work is to provide high quality of input power to the
inverter drive pertaining to marine water pumping applications. A solar PV fed
MMI for speed control of induction motor drive has been examined at steady state
and dynamic behaviors to investigate its suitability for water pumping system
intended for the marine applications. The solar PV array is connected with the
proposed inverter when is then fed to an induction motor. The motor speed is sensed
and feedback is given to the controller for generating optimal PWM pulses for
the inverter switches. The motor is started gradually and the speed is
increased to achieve reference speed with aid of PI and FL based controllers.
The performance of PI and FL controllers for a feasible operation is verified
and results are compared in both simulation and experiment. The results ensure
that the FL based controller provides fast settling time and reduced harmonics
when compared with the PI controller. The main impact of the proposed control
scheme is to reduce the steady-state error of the induction motor speed control
and deteriorate harmonics at the output voltage of modular multilevel inverter.
On considering the number of components required for the proposed MMI, the
Table 3 illustrates the comparative analysis on the number of semiconductor
switches required for the design of MMI along with those inverters available in
the literature.
The
source, converter, load, controller and grid are the major components of a DC
microgrid. A microgrid is normally referred as a standalone autonomous system
to generate power by the community and for the community regions. In the
proposed system, the entire component cited for DC microgrid is present and
performs its function effectively. The appropriate estimation of power
generated and power used is the future scope.
REFERENCES:
[1] H. Lan, Y. Bai, S.Wen, D. C. Yu, Y.-Y. Hong, J. Dai, and P.
Cheng, ``Modeling and stability analysis of hybrid PV/diesel/ESS in ship power
system,'' Inventions, vol. 1, no. 5, pp. 1_16, 2016, doi: 10.3390/inventions1010005.
[2] S. G. Jayasinghe, L. Meegahapola, N. Fernando, Z. Jin, and J.
M. Guerrero, ``Review of ship microgrids: System architectures, storage
technologies and power quality aspects,'' Inventions, vol. 2, no. 4, pp.
1_19, 2017, doi: 10.3390/inventions2010004.
[3] R. Kumar and B. Singh, ``Single stage solar PV fed brushless
DC motor driven water pump,'' IEEE J. Emerg. Sel. Topics Power Electron.,
vol. 5, no. 3, pp. 1337_1385, Sep. 2017, doi: 10.1109/JESTPE.2017.2699918.
[4] S. Shukla and B. Singh, ``Single-stage PV array fed speed
sensorless vector control of induction motor drive for water pumping,'' IEEE
Trans. Ind. Appl., vol. 54, no. 4, pp. 3575_3585, Jul./Aug. 2018, doi: 10.1109/TIA.2018.2810263.
[5] C.-L. Su, W.-L. Chung, and K.-T. Yu, ``An energy-savings
evaluation method for variable-frequency-drive applications on ship central
cooling systems,'' IEEE Trans. Ind. Appl., vol. 50, no. 2, pp.
1286_1297, Mar./Apr. 2014, doi: 10.1109/TIA.2013.2271991.
