off on on off off on 0 -Vdc/2 -Vdc/2 0 -Vdc/2

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off on on off on on Vdc/2 -Vdc/2 -Vdc/2 Vdc/2 -Vdc

For mode 7and 8 has two distinct states, gating logic in state (b) as follows y7b = (-Vdc ≤ Vref ≤ -Vdc/2) ∧ ((Vref > Vc1)∨ (Vref > Vc3))

y8b = (-Vdc ≤ Vref ≤ Vdc/2)∧((Vref>Vc2)∨ (Vref > Vc4))

For mode 2, gating logics are y 2 = (-Vdc≤ Vref≤ -Vdc/2) ∧ ((Vref ≤Vc1) ∧ (Vref ≤ Vc2) ∧ (Vref ≤ Vc3) ∧ (Vref ≤ Vc4))

Based on table 3, Logic circuits for each switch can be given as follows [11] Q1 = y1 ∨ y3a ∨ y3b ∨ y5a ∨ y5b ∨ y6a ∨ y6b Q2 = ¬Q1 Q3 = y2 ∨ y3a ∨ y3b ∨ y7a ∨ y7b ∨ y8a ∨ y8b Q4 = ¬Q3 Q5 = y1 ∨ y2 ∨ y5a ∨ y5b ∨ y7a ∨ y7b Q6 = y1 ∨ y2 ∨ y6a ∨ y6b ∨ y8a ∨ y8b

IV. SIMULATION RESULTS AND DISCUSSIONS FOR PROPOSED SYSTEM

The proposed reduced switch count five level H-bridge inverter with integrated boost converter in the solar PV system has been modelled and simulated in MATLAB/SIMULINK environment using simpower system toolbox. The multi carrier phase shifted pulse width modulation technique with sinusoidal reference is used to trigger the switches in reduced switches count five level Hbridge inverter. The circuit was simulated with load. Parameters of solar panel and boost converter are shown in table.1and 2.The proposed system is implemented in 1000w/m2 irradiance and 25degrees C temperature. Parameters of reduced switch count fivelevel H- bridge inverter as shown in below table.4.

Table.4. Simulation Parameters PARAMETERS VALUES Switching frequency 6KHz Output frequency 50Hz Capacitor C1=C2 2200µF Load 10Ω

PV array power, voltage, boost voltage and inverter output voltage values for different irradiations as shown in below table.

Table.5. Output Values for Different Irradiations Irradiation 1000w/m2 900w/m2 800w/m2 700w/m2

PV power 950W 920W 898W 858W

PV voltage 64V 64V 63.9V 63.8V

Boost voltage 100V 100V 100V 100V

Inverter voltage(Vpeak) 100V 100V 100V 100V

The dc output voltage of PV module and DC-DC boost converter and ac output voltage and current of proposed model are given in fig.11, fig.12, fig.13, fig.14, fig.15 and fig.16 respectively. The total harmonic distortions for the output voltage with load are given in fig.17.

Fig.11. PV Array Output Voltage

In fig. 11 shows the output voltage of PV with irradiance 1000W/m2 and 25degrees temperature.

Fig.12. Boost Converter Output Voltage

In fig.12 shows the output voltage of DC-DC boost converter.

Fig.13. Output Voltage of Inverter

Fig.14. Magnified view of Output Voltage of Inverter

In fig.13 shows the output voltage waveform of a proposed system. The output voltage waveform has 5-levels for one cycle of 50HZ frequency can be observed. Which are -100,-50, 0, 50 and100.

Fig.15. Output Current of Inverter

Fig.16. magnified view of Output Current of Inverter

In fig.15 shows the output current waveform of a proposed system. The output current waveform with peak amplitude of 9.98A

Fig.17. FFT analysis of output voltage

In fig.17 shows the total harmonic distortion (THD) for the output voltage of proposed model with load. To determine the THD present in a waveform, the line spectrum of the output voltage waveform is considered. From the results the proposed system gives reduced THD. As the no.of power switches are reduced power losses and conduction and switching losses will also be reduced.

V. CONCLUSION

In this paper, the proposed reduced switch count five level H-bridge inverter with integrated boost converter in the solar PV system has been modelled and simulated in MATLAB/SIMULINK software. The reduced switches count 5-level H-bridge inverter is connected from one independent solar panel with INC MPPT algorithm instead of Dc source through boost converter. The most important features of proposed system is increasing the no.of output levels with reduced no.of switches and thereby, decreasing the size, complexity, cost, switching and conduction losses and power losses. The proposed model shown to be the one of the best in terms of efficiency and lesser percentage of voltage THD, Simulation results allow us to conclude that the proposed model offers better performance. Hence the proposed system is suitable for PV applications.

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