Project Report on
Simulation And Implementation Of Cascade
H-Bridge Multi-Level Inverter Using Induction
Motor.

UDP Project

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Prepared By:
1. Anushi Tripathi (150420109501)
2. Aanchal Jain (150420109515)
3. Saloni Maheshwari (150420109521)
4. Hemanginee Vasava (150420109558)
5. Vikas Patel (160423109510)

In fulfilment for the award of the degree
Of
B.E (Electrical)
Guided By:
Prof. Sharad Patel
Assistant Professor

Department Of Electrical Engineering

2018-2019

Department Of Electrical Engineering
Sarvajanik College of Engineering and Technology, Surat.
Gujarat Technological University, Ahmedabad.

This is to certify that the project entitled “SIMULATION AND IMPLEMENTATION OF
CASCADED H- BRIDGE MULTILEVEL INVERTER USING INDUCTON MOTOR” is submitted by

1. Anushi Tripathi (150420109501)
2. Aanchal Jain (150420109515)
3. Saloni Maheshwari (150420109521)
4. Hemanginee Vasava (150420109558)
5. Vikas Patel (160423109510)

In partial fulfilment of the requirement for the award of the Bachelor Degree in
Electrical Engineering of the Gujarat Technological University (GTU),
Ahmedabad, at Sarvajanik College of Engineering and Technology, Surat is a
record of their work carried out under our supervision and guidance.

Prof. Sharad Patel Prof. Shabbir Bohra
(Project Guide) (Head of Department)

Examiner’s Certificate of Approval

This is to certify that the project entitled “SIMULATION AND IMPLEMENTATION OF
CASCADED H- BRIDGE MULTILEVEL INVERTER USING INDUCTON MOTOR” is submitted by

1. Anushi Tripathi (150420109501)
2. Aanchal Jain (150420109515)
3. Saloni Maheshwari (150420109521)
4. Hemanginee Vasava (150420109558)
5. Vikas Patel (160423109510)

In partial fulfillment of the requirement for the award of the Bachelor Degree
in Electrical Engineering of the Gujarat Technological University (GTU),
Ahmedabad, at Sarvajanik College of Engineering and Technology, Surat is a
record of their work carried out under our supervision and guidance.

Examiners:

1) _________________________

2) _________________________

3) _________________________

INDEX

1. Introduction…………………………………………………

1.1 Need of Multilevel Inverter…………………………….

1.2 Main Features of Multilevel Inverter……………………

2. Classification of Multilevel Inverter………………………..

2.1 Common DC Source…………………………………..

2.1.1 Diode Clamped MLI…………………………….

2.1.2 Capacitor Clamped MLI…………………………

2.2 Separate DC Source……………………………………

2.2.1 Cascade H bridge MLI………………………….

3. Periodic Progress Report
(PPR)……………………………..

4. Patent Search and Analysis Report
(PSAR)…………………

5. Design Engineering Canvas…………………………………

6. MATLAB Simulation and Waveforms……………………..

7. Materials required ………………………………………….

8. Cost of Project………………………………………………

9. References…………………………………………………..

1. Introduction

Multilevel starts with three level. Multilevel inverters
include an array of power semiconductors and capacitor
Voltage sources. In high power applications:

(i) Device rating
(ii) Problem of device stress
(iii) Device switching loss
(iv) Electromagnetic Interference (EMI)

1.1 Need of Multilevel Inverter

(i) To increase inverter operating voltage without devices in
series.
(ii) To minimize THD with low switching frequencies.
(iii) To reduce EMI due to lower voltage steps.

1.2 Main features of Multilevel Inverter

(i) Less switching stress on devices
(ii) High voltage ; high power capability
(iii) Reduced harmonic contents without increasing switching
frequency or decreasing the inverter power output
(iv) No need of extending the device rating
(v) Reduced switching losses
(vi) Reduced dv/dt
(vii) Reduced (or even eliminated) common mode voltages
(viii) Good electromagnetic compatibility (EMC)

(ix) Elimination of the problem of unequal device ratings,
(x) Capacitor voltage balancing along with significant
reduction in Device Count.

Basic circuit of Multilevel Inverter (3 phase-5 level):-

2. Classification of Multilevel Inverter

2.1 Common DC Source

2.1.1 Diode Clamped MLI

The main concept of this inverter is to use diodes and
provides the multiple voltage levels through the different
phases to the capacitor banks which are in series. A diode
transfers a limited amount of voltage, thereby reducing the
stress on other electrical devices. The maximum output
voltage is half of the input DC voltage. It is the main
drawback of the diode clamped multilevel inverter.

This problem can be solved by increasing the switches,
diodes, capacitors. Due to the capacitor balancing issues,
these are limited to the three levels. This type of inverters
provides the high efficiency because the fundamental
frequency used for all the switching devices and it is a simple
method of the back to back power transfer systems.

The advantages for the diode-clamped inverter are:

(1) A large number of levels ‘n’ yields a small harmonic
distortion.
(2) All of the phases share a common dc bus.

The disadvantages for the diode-clamped inverter are:

(1)Need high voltage rating diodes to block the reverse
voltages.

(2)The number of switches, capacitors, and diodes required in
the circuit increases with the increase in the number of output
voltage levels. Extra clamping diodes required are (n-1) (n-2)
per phase.

2.1.2 Capacitor Clamped MLI

The main concept of this inverter is to use capacitors. It is of
series connection of capacitor clamped switching cells. The
capacitors transfer the limited amount of voltage to electrical
devices. In this inverter switching states are like in the diode
clamped inverter.
Clamping diodes are not required in this type of multilevel
inverters. The output is half of the input DC voltage. It is
drawback of the flying capacitors multi-level inverter. It also
has the switching redundancy within phase to balance the
flaying capacitors. It can control both the active and reactive
power flow. But due to the high frequency switching,
switching losses will takes place.

Advantages of capacitor clamped inverter are:

(1)Lower Total Harmonic Distortion when the number of
levels ‘n’ is high.
(2) Active and Reactive power flow can be controlled.

Disadvantages of capacitor clamped inverter are:

(1)Large numbers of capacitors are bulky and more expensive
than the clamping diodes used in the diode-clamped
multilevel inverter.

(2) Complex control is required to maintain the capacitor’s
voltage balance.

2.2 Separate DC source

2.2.1 Cascade H-bridge MLI

The cascaded H-bride multi-level inverter is to use separate dc
source and switches and requires less number of components
in each level. This topology consists of series of power
conversion cells and power can be easily scaled. The
combination of capacitors and switches pair is called an H-
bridge and gives the separate input DC voltage for each H-
bridge. It consists of H-bridge cells and each cell can provide
the three different voltages like zero, positive DC and
negative DC voltages. One of the advantages of this type of
multi-level inverter is that it needs less number of components
compared with diode clamped and flying capacitor inverters.

The price and weight of the inverter are less than those of the
two inverters. Soft-switching is possible by the some of the
new switching methods.
Multilevel cascade inverters are used to eliminate the bulky
transformer required in case of conventional multi-phase
inverters, clamping diodes required in case of diode clamped
inverters and flying capacitors required in case of flying
capacitor inverters. But these require large number of isolated
voltages to supply the each cell.

Advantages of Cascade H-bridge inverter are:

The multilevel inverters produce common mode voltage,
reducing the stress of the motor and don’t damage the motor
by dv/dt.

1. Size is compact because no use of diode clamed and flying
capacitor component in the circuit.

2. High power rating: When the power rating is much more
then multilevel is very obvious choice.

3. Switching Frequency: The multilevel inverter can operate
at both fundamental switching frequencies that are higher
switching frequency and lower switching frequency. It should
be noted that the lower switching frequency means lower
switching loss and higher efficiency is achieved and also soft
switching techniques.

4. Reduced harmonic distortion: Selective harmonic
elimination technique along with the multi-level topology
results the total harmonic distortion becomes low in the output
waveform without using any filter circuit.

Disadvantages of Cascade H-bridge inverter are:

1. It needs separate DC source.
2. Switching configuration is not same for all IGBTs.
3. Number of IGBTs requirement is more.
4. Circuit is complex.

3. Periodic Progress Report (PPR)

PPR-1:

PPR-2:

PPR-3:

PPR-4:

4. Patent Search and Analysis Report (PSAR)

5. Design Engineering Canvas

(a.) AEIOU Canvas

(b.) Empathy Canvas

(c.) Ideation canvas

(d.) Product Development Canvas

6. MATLAB Simulation and Waveform

9-level inverter on MATLAB

Generating Gate pulse for different IGBTs.

PWM Technique comparing Sine with triangular wave.

Waveform of Voltage and current.

7. Material Required

For Hardware:

(i) Separate DC Source
(ii) IGBTs
(iii) Driver ICs
(iv) High Performance Microcontroller
(v) Induction Motor

For Software:

(i) MATLAB
(ii) Waijung

8. Cost of Project

For Hardware- up to Rs.5000 (estimated as per observation)

For Software- MATLAB- Free
Waijung- Rs.500

9. References

Electrical and Electronics Engineering Basics & Principles


https://www.elprocus.com/multilevel-inverter
https://xplqa30.ieee.org
https://origin-ars.els-cdn.com
http://power.eecs.utk.edu

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