MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase...

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MULTILEVEL INVERTERS By Vaishnavi

Transcript of MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase...

Page 1: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

MULTILEVEL INVERTERS

By Vaishnavi

Page 2: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

NEED FOR MULTILEVEL INVERTER

High Power application

Staircase waveform

Input Current

Switching Frequency

Renewable Energy sources

Only disadvantage – More Switches, Cost

Page 3: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

BASIC CONCEPT

Use of Power SemiconductorSwitches in series - with several lower voltage dc sources - staircase voltage waveform

Lower voltage dc sources – Capacitors, Batteries, PV cells

Page 4: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

TYPES OF MULTILEVEL INVERTERS

Diode Clamped Multilevel Inverter

Flying Capacitor Multilevel Inverter

Cascade Multilevel Inverter

Page 5: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

DIODE CLAMPED MULTILEVEL INVERTER

Let, m number of nodes or levelsThen, We require,

(m-1) Capacitors2(m-1) Switching Devices

Example :-m= 6

Therefore, Capacitors – 5 Switching Devices - 10

Page 6: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

CIRCUIT DIAGRAM OF 6- LEVEL INVERTER

Page 7: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

SWITCHING STATES

Page 8: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

LINE VOLTAGE WAVEFORM OF SIX LEVEL CONVERTER

Page 9: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

FEATURES OF DIODE CLAMPED INVERTER

High Voltage rating for blocking diodes

Unequal Switch device Rating

Capacitor Voltage Unbalance

Page 10: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

Advantage & Disadvantage

ADVANTAGES

Harmonic Content is less-filters avoidedEfficiency – HighControl method - simple

DISADVANTAGES

Difficult to control the real power of individual converterNeed for more clamping diodes

Page 11: MULTILEVEL INVERTERS By Vaishnavi. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable.

Thank You