maintaing solar energy constant and output is used to drive ASD using MATLAB

1. DIGITAL SIMULATION OF RENEWABLE
ENERGY SOURCE CONTROLLED EZ SOURCE
INVERTER

2. ∗ INTRODUCTION
∗ EXISTING SYSTEM
∗ PROPOSED SYSTEM
∗ ADVANTAGES
∗ CONCLUSION
CONTENTS

3. ∗ Ez source inverter for Buck-Boost energy conversion is
implemented using only passive elements.
∗ No additional active elements are not required.
∗ Ez source inverter produce same gain as Z-source inverter.
∗ The system itself reduces THD
INTRODUCTION

4. EXISTING SYSTEM
VOLTAGE SOURCE INVERTER

5. ∗ Ac output voltage is limited below and cannot exceed
the dc voltage.
∗ Hence, voltage source inverter is a buck inverter for dc-
ac power conversion.
∗ For Applications where over drive is desirable and the
available DC voltage is limited . An additional converter
is required for AC output voltage.
∗ An output LC filter is required for providing sinusoidal
voltage . Hence, cost of the system increases.
Contd…

6. EXISTING SYSTEM
CURRENT SOURCE INVERTER

7. ∗ It is a boost inverter.i.e the output AC current is greater
than the INPUT current it cannot be used as buck
inverter.
∗ Cost of CSI is high.
∗ Operating power factor is poor on line side.
∗ CSI is vulnerable to EMI noise in terms of reliability.
Contd….

8. PROPOSED SYSTEM

9. ∗ It consists of voltage source from the dc supply,
impedance network and three phase inverter and with
AC motor load.
∗ Z network consists of two equal inductors(L1&L2) and
two equal capacitors(C1&c2).
∗ This network acts as second order filter.
∗ This network requires less inductance and capacitor in
smaller in size.
∗ Constant impedance output voltage fed to 3 phase
inverter .
Contd…

10. ∗ Shoot through operation:
∗ The average voltage of inductor over one switching
period should be zero in steady state is :
Mode 1 :

11. ∗ Non shoot through state operation :
Mode 11 :

12. Contd…
∗ Output of DC source is:
∗ The output voltage can be stepped up (or) stepped down
by choosing an appropriate Buck-Boost factor

13. ∗ Low switching losses
∗ Current ripples from the solar cell is reduced.
∗ Reverse blocking voltage is possible.
∗ Low rating of capacitor is used.Hence cost effective is
reduced
ADVANTAGES

14. ∗ Comparing with other inverters , EZ inverters have the advantages
of drawing smoother current from dc input source without using
external LC filters and lower required capacitor voltage.
∗ EZ inverter performs as both operations of voltage source and
current source inverter.
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CONCLUSION