Multilevel Inverter

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The multilevel inverter generates multiple step voltage waveform with variable and controllable frequency, phase and amplitude. This Inverter is used for high power and power quality demanding applications. The number of step will be increased in the output, the losses will be reduced. The different types of Multilevel inverters are shown below.

  1. Cascaded Multilevel Inverter
  2. DSP Based Multilevel Inverter
  3. Fifteen level Cascaded Inverter
  4. Transformer Based Multilevel Inverter
  5. Five Level Quasi Z-Source Multilevel Inverter
  6. Arduino Based Multilevel Inverter
  7. Novel Seven Level Inverter
  8. Fifteen Level Inverter With Reduced Number of Components
  9. Multilevel Inverter by Employing SEPIC Converter
  10. New Five Level Active Neutral Point Clamped Converter

1. Cascaded Multilevel Inverter

The cascaded multilevel inverter is known as two or more inverter outputs are connected in series connection. And produce the multilevel output range depends on the input voltage ranges (+2v, +v, 0, -v, -2v). This cascaded Multilevel Inverter has different types. There are,

  1. Five Level Cascaded Multilevel Inverter
  2. Seven Level Cascaded Multilevel Inverter
  3. Nine Level Cascaded Multilevel Inverter

1. Five Level Cascaded Multilevel Inverter

This five level cascaded multilevel inverter output waveform is obtain by using the two h-bridge inverters. And this h-bridge inverters are connected in cascade connection.

Output waveform for five level cascaded multilevel inverter

2. Seven Level Cascaded Multilevel Inverter

The seven level output is produced this novel seven level multilevel inverter by using PIC controller. This multilevel inverter is producing the seven level of output.

3. Nine Level Cascaded Multilevel Inverter

In normal nine level inverter needs 4 H-bridge inverters. For this nine level multilevel inverter needs 2 inverters only. So number of switches will be reduced, so switching losses will be reduced.

Output Waveform for nine level inverter

2. DSP Based Multilevel Inverter

The DSP based multilevel inverter is producing seven level multilevel output by using DSP controller. The DSP controller is used to generate the PWM signals.

Prototype Model for DSP based Multilevel Inverter

3. Fifteen Level Cascaded Multilevel Inverter

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This project is produce the fifteen level output using three h- bridge inverter. The fifteen level inverter produce 15 level so harmonics will be reduced and power switches will be reduced.

Prototype Model for fifteen level cascaded multilevel inverter

4. Transformer Based Multilevel Inverter

This project can be produce nine level output by using transformer topology. It consists of two H-bridges fed from single DC source. It producing nine level AC output waveform.

5. Five Level Quasi Z-Source Multilevel Inverter

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This project has two h-bridge inverter. The input voltage is boosted by using the quasi z source circuit. Boosted dc voltage is applied to the inverter circuit, this project is used for renewable energy sources.

Prototype model for single phase five level quasi z source inverter

6. Arduino Based Multilevel Inverter

The Arduino based multilevel inverter is producing the seven level output waveform. The Arduino controller is used to generate the PWM pulses and applied to driver circuit. The driver circuit is isolate and amplify the input signal.

7. Novel Seven Level Inverter

This seven level inverter is produce the seven level output by using DSP controller ( TMS320F2812 Starter Kit ). This DSP controller is used to generate the PWM pulses for this project.

TMS320F2812 starter kit

8. Fifteen Level Inverter With Reduced Number of Components

Click here for Video Demo

In normal fifteen level inverter has 6 electrical sources and 6 h-bridge inverters, so switching losses is increased. The switching losses and harmonics will be reduced by using this project. And also reduce the power switches.

Prototype model for fifteen level inverter with reduced components

9. Multilevel Inverter By Employing SEPIC Converter

The five level cascaded multilevel inverter producing the 5 level output by employing sepic converter. The SEPIC converter is converts low voltage dc to high voltage dc voltage and the dc voltage is applied to multilevel inverter circuit. 

Block Diagram for five level multilevel inverter by employing sepic converter

10. New Five Level Active Neutral Point Clamped Converter

This new five level active neutral point clamped converter is producing the five level inverter output and this converter is based on cascaded H-bridge inverter and various topologies.

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