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Analysis of Harmonics Injected by Single Phase Inverter

von Chayan Mehta (Autor) Arpita Singh (Autor) Rahul Lohiya (Autor) Surabhi Bhattacharya (Autor)

Projektarbeit 2013 31 Seiten

Elektrotechnik

Leseprobe

Table of Contents

Chapter 1 Introduction
Software Used
Single Phase Voltage Inverter
Single Phase Half Bridge Inverter8 Single Phase Full Bridge Inverter

Chapter 2 Analysis of Single Phase Inverter
1. Analysis of Single Phase Half Bridge Inverter with R load
Single Phase Inverter Half Bridge with RL load.
Single Phase Inverter Half Bridge with RLC Load
2. Analysis of Single Phase Full- Wave Inverter with R load
Single Phase Inverter Half Wave with RL load
Single Phase Inverter Half Wave with RLC load

Chapter 3 Results
1. FFT Analysis of Single Phase Half Bridge Inverter with R load
Single Phase Inverter Half Bridge with RL load.
Single Phase Inverter Half Bridge with RLC Load
2. FFT Analysis of Single Phase Full- Wave Inverter with R load
Single Phase Inverter Half Wave with RL load
Single Phase Inverter Half Wave with RLC load

Chapter 4 Conclusion.

Chapter 5 Further Scope

References

CERTIFICATE

This is to certify that the Minor/Major Project entitled ‘ Analysis of Harmonics Injected by Single Phase Inverter ’ being submitted by Arpita Singh, Chayan Mehta Rahul Lohiya ,Surabhi Bhattacharya in fulfillment of the requirement for the award of degree of Bachelor of Technology in Discipline of Electronics & Communication Engineering, has been carried out under my supervision and guidance. The matter embodied in this thesis has not been submitted, in part or in full, to any other university or institute for the award of any degree, diploma or certificate.

Prof. Ritesh Tirole

Assistant Professor

Prof. Udayprakash Raghunath Singh Head of Department

Electronics and Communication Engineering

Dr. Achintya Choudhury

Dean, School of Engineering

Sir Padampat Singhania University Udaipur- 313601 Rajasthan India

Acknowledgement

We would like to express the deepest appreciation to our Mentor Mr. Ritesh Tirole, who has the attitude and the substance of a genius: he continually and convincingly conveyed a spirit of adventure in regard to research and scholarship, and an excitement in regard to teaching. Without his guidance and persistent help this dissertation would not have been possible.

We would also like to thank all my instructors and teachers, who throughout my educational career have supported and encouraged me to believe in my abilities. They have directed me through various situations, allowing me to reach this accomplishment.

We deeply express our sincere thanks to our Head of Department Mr. Udayprakash Raghunath Singh for encouraging and allowing us to do the project on the topic “Analysis of Harmonics Injected by Single Phase Inverter”. We take this opportunity to thank all our lecturers who have directly or indirectly helped our project. We pay our respects and love to our parents and all other family members and friends for their love and encouragement throughout our career. Last but not the least we express our thanks to our friends for their cooperation and support.

Team Members

Arpita Singh

Chayan Mehta Rahul Lohiya

Surabhi Bhattacharya

Abstract

The power electronics device which converts DC power to AC power at required output voltage and frequency level is known as inverter. As we have found that different inverters are used for different equipment’s so in our project titled

“ Analysis of Harmonics injected by Single phase Inverter” , we are analyzing the harmonics present in single phase voltage source inverter using different loads (R,RL and RLC).

We are analyzing Harmonics using MATLAB tools like Scope for harmonics and Simulink powergui for analysis of FFT of different Signals.

Chapter 1 Introduction

A Circuit that converts dc power into ac power at desired output voltage and frequency is called an inverter. Some industrial applications of inverters are for adjustable-speed ac drives, induction heating, stand by air-craft power supplies, UPS (uninterruptible power supplies).

The dc power input to the inverter is obtained from an existing power supply network or from a rotating alternator through a rectifier or a battery, fuel cell, photovoltaic array or magnetic hydrodynamic generator. The rectification is carried out by standard diodes or thyristor converter circuits.

Inverters can be broadly classified into two types:

- Voltage Source Inverters dc source has small or negligible internal impedance.
- Current Source Inverters adjustable current from a dc source of high internal impedance.

From the viewpoint of connection of semiconductor devices, inverters are classified as under:

- Bridge inverters.
- Series inverters.
- Parallel inverters.

Harmonics: A harmonic of a wave is a component frequency of the signal that is an integer multiple of the fundamental frequency, i.e. if the fundamental frequency is f, the harmonics have frequencies 2f, 3f, 4f, . . . etc. The harmonics have the property that they are all periodic at the fundamental frequency, therefore the sum of harmonics is also periodic at that frequency.

Software Used: MATLAB R2010a

Tools Used: MATLAB Simulink

Abbildung in dieser Leseprobe nicht enthalten

Figure 1.1

MATLAB Simulink:

Abbildung in dieser Leseprobe nicht enthalten

Figure 1.2

Single-Phase Voltage Source Inverters Single-phase bridge inverters are of two types, namely

- Single-phase half-bridge inverters.
- Single-phase full-bridge inverters.

Single phase half-bridge inverter:

Abbildung in dieser Leseprobe nicht enthalten

Figure 1.3 Single phase half-bridge inverter

- The circuit consist of two IGBTs, 3-wire dc supply and Pulse generators.
- The gating signal for both IGBTs are provided by pulse generators.
- Each provides opposite polarity of Vs/2 across the load.

Single phase full -bridge inverters:

Abbildung in dieser Leseprobe nicht enthalten

Figure 1.3 Single phase full bridge inverters

- The circuit consist of four IGBTs, dc voltage supply. Pulse generators and load.
- IGBT-IGBT3 and IGBT1-IGBT2 switched on and off alternately
- The gating signal for IGBT’s are provided by pulse generators.
- Each pair provide opposite polarity of Vs across the load
- The main drawback of half bridge inverter is that it requires 3-wire dc supply. This difficulty is removed by the use of full bridge inverters.

Chapter 2 Analysis of Single-phase Bridge Inverters

The output voltage obtained from inverters is not a sine wave. It consists of fundamental component plus certain harmonics. The harmonics in the output voltage waveform of inverters leads to poor load performance and reduced system efficiency. Lower the harmonic content in the output waveform, better is the quality of the inverter.

1. Single-phase half bridge inverter

- Single-phase half bridge inverter with R load

Abbildung in dieser Leseprobe nicht enthalten

Figure 2.1 Single-phase half bridge inverter with R load

For above figure (1.3) Pulse Generator1 has following values: Period (sec) =0.02(20ms).

Pulse width (% of Period) =50 and Phase Delay (sec) =0. Phase Delay for Pulse Generator is 0.01sec

- In this circuit ,3-wire dc supply is used as input voltage supply.IGBTs are responsible for switching activity and the gating pulse from the pulse generators is responsible for the firing of IGBTs.
- Output voltage and Current is being measured at load using voltage and current measuring devices respectively.
- The Output Voltage and Current Waveform of Single phase half-bridge inverter with R Load are as follows:

The Load current waveform is identical with load voltage waveform

Abbildung in dieser Leseprobe nicht enthalten

Figure 2.2 load voltage waveform of Single-phase half bridge inverter with R load

For Figure 2.2,

X-axis defines Time Period and Y-axis defines Voltage Value and Current Value respectively.

Single phase half-bridge inverter with RL Load.

Abbildung in dieser Leseprobe nicht enthalten

Figure 2.3 Single phase half-bridge inverter with RL Load

For above figure (2.5) Pulse Generator1 has following values: Period (sec) =0.02(20ms).

Pulse width (% of Period) =50 and

Phase Delay (sec) =0. Phase Delay for Pulse Generator is 0.01sec

- In this circuit ,3-wire dc supply is used as input voltage supply.IGBTs are responsible for switching activity and the gating pulse from the pulse generators is responsible for the firing of IGBTs.

- Output voltage and Current is being measured at load using voltage and current measuring devices respectively.

- The Output Voltage and Current Waveform of Single phase half-bridge inverter with RLC Load are as follows:

Abbildung in dieser Leseprobe nicht enthalten

Figure 2.4

For Figure 2.4,

X-axis defines Time Period and Y-axis defines Voltage Value and Current Value respectively.

[...]

Details

Seiten
31
Jahr
2013
ISBN (eBook)
9783656549727
ISBN (Buch)
9783656548577
Dateigröße
5.2 MB
Sprache
Englisch
Katalognummer
v265312
Institution / Hochschule
Sir Padampat Singhania University
Note
Schlagworte
analysis harmonics injected single phase inverter

Autoren

  • Chayan Mehta (Autor)

    1 Titel veröffentlicht

  • Arpita Singh (Autor)

  • Rahul Lohiya (Autor)

  • Surabhi Bhattacharya (Autor)

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Titel: Analysis of Harmonics Injected by Single Phase Inverter