This document proposes a new solar power generation system composed of a DC/DC boost converter and a novel seven-level inverter. The seven-level inverter uses only six switches, simplifying the circuit. It operates in different modes to produce varying output voltages. Simulation results show the system works as intended. Advantages of solar include being renewable, producing electricity and heat with little maintenance, while disadvantages are lack of power at night and during cloud cover.

1. A SOLAR POWER GENERATION SYSTEM WITH A
SEVEN-LEVEL INVERTER
BY
CH.SHASHANK

2. INTRODUCTION
 This paper proposes a new solar power generation system, which is
composed of a DC/DC power converter and a new seven-level
inverter.
 DC-DC boost converter.
 Solar energy is becoming more important since it produces less
pollution and the cost of fossil fuel energy is rising, while the cost of
solar arrays is decreasing.
 The power conversion interface is important for DC-AC.
 Conversion interface is important to insure there is no waste of the
energy generated by the solar cell array.
 This new seven-level inverter contains only six power electronic
switches, so the power circuit is simplified.

3. CIRCUIT CONFIGURATION

4.  The proposed solar power generation system is composed of a
solar cell array, a DC-DC power converter and a new seven-
level inverter.
 Transformer with a turn ratio of 2:1
 Seven-level inverter is composed of a capacitor selection
circuit and a full-bridge power converter, connected in cascade.
 The power electronic switches of capacitor selection circuit
determine the discharge of the two capacitors while the two
capacitors are being discharged individually or in series.

5. DC-DC POWER CONVERTOR
 The DC-DC power converter incorporates a boost
converter.
 Composed of an inductor, 𝐿 𝐷 , a power electronic switch,
𝑆 𝐷1 , 𝑆 𝐷2 and a diode 𝐷 𝐷1 , 𝐷 𝐷2 , 𝐷 𝐷3 . The boost
converter charges capacitor 𝐶1, 𝐶2 and transformer 𝑇𝑟.
 The boost converter is operated in the continuous
conduction mode.

6. OPERATING MODE 1
The energy stored in the magnetizing inductance is delivered to
capacitor 𝑐2 through 𝐷 𝐷2 and 𝑆 𝐷1 when 𝑆 𝐷2 is turned off.

7. OPERATING MODE 2
The energy of inductor 𝐿 𝐷 and the solar cell array charge
capacitor 𝐶2 through 𝐷 𝐷3 and charge capacitor 𝐶1 through the
transformer and 𝐷 𝐷1 during the off-state of 𝑆 𝐷1

8. SEVEN LEVEL INVERTER
 Will operate in 4 different modes

9. OPERATING MODE I
o/p voltage = Vdc/3

10. OPERATING MODE II
o/p voltage = 2Vdc/3

11. OPERATING MODE III
o/p voltage = Vdc

12. OPERATING MODE IV
o/p voltage = 0

13. OPERATING MODE V,VI,VII (INVERTER IN THE NEGATIVE HALF CYCLE)

14. SIMULATION RESULTS

15. ADVANTAGES
 It is renewable (at least until the sun runs out in
billions of years)
 Solar power can be used to generate electricity.
 It is used to heat water (solar water heaters).
 Solar Panels required little maintenance.
 Solar panels are a silent producer of energy.

16. DISADVANTAGES
 The primary disadvantages of solar power is that is
obviously cannot be created during the night.
 The power generation is also reduced during times of
cloud cover.

17. CONCLUSION
 A solar power generation system to convert the DC
energy generated by a solar cell array into AC energy
that is fed into the utility.
 The proposed solar power generation system is
composed of a DC/DC power converter and a seven-
level inverter.
 The seven-level inverter contains only six power
electronic switches, which simplifies the circuit
configuration. Furthermore, reduces the switching power
loss and improves the power efficiency.

18. THANK YOU