2. NEED FOR MULTILEVEL INVERTER
High Power application
Staircase waveform
Input Current
Switching Frequency
Renewable Energy sources
Only disadvantage – More Switches, Cost
3. BASIC CONCEPT
Use of Power Semiconductor
Switches in series - with several lower
Voltage dc sources - staircase voltage waveform
Lower voltage dc sources
– Capacitors, Batteries, PV cells
5. DIODE CLAMPED MULTILEVEL
INVERTER
Let, m → number of nodes or levels
Then, We require,
(m-1) → Capacitors
2(m-1) → Switching Devices
Example :-
m= 6
Therefore,
Capacitors – 5
Switching Devices - 10
9. FEATURES OF DIODE CLAMPED
INVERTER
High Voltage rating for blocking diodes
Unequal Switch device Rating
Capacitor Voltage Unbalance
10. Advantage & Disadvantage
ADVANTAGES
➢Harmonic Content is
less-filters avoided
➢Efficiency – High
➢Control method - simple
DISADVANTAGES
➢Difficult to control the
real power of individual
converter
➢Need for more
clamping diodes