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Fig. 5. The center of the area under the curve.
Fig. 6. The Gaussian membership function.
Since the loads are identical, the simulation results were taken current at the input and at the output of the inverter is divided
for the first load. Fig. 15 demonstrated the batteries voltage,
converter output, load voltage, and load current at the output
power is 880W, Fig. 16 depicted the waveforms at the output
power is 660W, Fig. 17 when the output power is 440W, and
Fig. 18 when the output power is 220W. Fig. 19 depicted the
simulation result when the battery voltage drops to 94v, and
output power is 880W.
Simulation results demonstrated obtaining of 220 V, 50
Hz, with an acceptable limits of the total harmonics distortion
(THD) according to the IEEE standard, which is less than
5% with the largest single harmonic no more than 3% of the
fundamental voltage. Table IV shows the total harmonics dis-
tortion (THD) which are obtained from the FFT(Fast Fourier
Transform) algorithm using powergui tool in MATLAB pro-
gram.
VIII. CONCLUSION
Fuzzy logic is easy and efficient to work with nonlinear sys-
tems, preferably with as few membership functions as possible
to get a faster response time. Twin inverter technology is an
Shukir
Fig. 7. The membership function of error and change of error
signals of The Dc voltage regulator.
Fig. 8. The membership function of output signal of the Dc
voltage regulator.
advanced form of the inverter, as it ensures less noise, less
energy consumption, and less fluctuations [19], because the
between the two bridges, which leads to a decrease in the
losses to a half, and thus reducing the rise in temperatures,
and improve the efficiency and the power factor of the inverter,
therefore, this technology is used in modern air conditioners
to operate more than one compressor without connect it in
parallel, in addition to the possibility of making them rotate in
opposite directions [20]. Diversity of electrical power sources
plays a vital role in obtaining a reliable electrical power, such
as DC sources for small loads, and AC sources without fuel for
large loads such as concentrated solar power (CSP) systems,
and thermal solar power (TSP) systems.
CONFLICT OF INTEREST
The author has no conflict of relevant interest to this article.