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Presented by:

PRANAV S

E7B

Roll No: 7834

BIDIRECTIONAL INTELLIGENT SEMICONDUCTOR TRANSFORMER2

INTRODUCTION

FEATURES

MODE OF OPERATION

CIRCUITS AND WAVE FORMS

CONCLUSION

REFERENCES

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OBJECTIVE

To provide better power quality.

To improve efficiency of transmission system

To eliminate voltage sag and swell

To provide powerfactor correction

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INTRODUCTION

•Smart grid is one which meets the greater demand of

power quality distribution automation in the current

power utilization scenario

•Conventional transformers do not satisfy the

requirements of modern smart grid innovation

•This inturn necessitates the use of an advanced power

transforming technology

•This is made possible through power electronic devices

creating an advanced technology known as BIST

(Bidirectional Intelligent semiconductor Transformer)

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Input-to-output isolation with a high-

frequency transformer

Bidirectional power flow

Small size and light weight

Capability of compensating voltage sag/or

swell

Realization of three-phase structure based on single-phase module.

FEATURES OF BIST

High voltage part

High-voltage high-frequency ac/dc converter

Low voltage part

Bidirectional low-voltage dc/dc converter

Hybrid-switching dc/ac inverter

BIDIRECTIONAL INTELLIGENT SEMICONDUCTOR TRANSFORMER6Fig 1

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HIGH-VOLTAGE PART

• The frequency of HV AC supply is increased to higher

level by proper gating of IGBT

• This can be further step down using a small

and light weight transformer

• This voltage is then rectified into pulsating dc

• All the above processes can be done in four modes

(A,B,C,D) of which two are in forward direction and

two are in reverse direction

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BIDIRECTIONAL HIGH-FREQUENCY AC/DC CONVERTER(HIGH-VOLTAGE PART )

Fig 2

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MODE A OPERATION

Fig 3

Fig 4

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MODE B OPERATION

At first instant M2 turns on.

At next instant M4 turns on.

Fig 5

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CURRENT PATH FOR EACH OPERATION MODE IN THE AC/DC RECTIFIER

MO

DE A

MO

DE

B

MO

DE C

MO

DE D

Fig 5

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LOW-VOLTAGE PART

Consist of two parts

1.Dc-Dc converter

converts 320VDC into fixed 700VDC

2.Dc-Ac inverter

converts 700VDC into 320VAC

The output voltage remains constant .

Eliminate counter emf effect by using diodes

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OUTPUT

LOW VOLTAGE PART (CIRCUIT)

Fig 9

M1

M2

M3

M4

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VOLTAGE AND CURRENT CONTROL

Fig 10

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To reduce high frequency switching loss MOSFET is

connected Parallel to IGBT

MOSFET and IGBT provides hybrid switching

Diode provides protection for MOSFET

GATING METHOD

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GATING METHOD CIRCUIT

Fig 11

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VOLTAGE AND CURRENT WAVEFORMS

DURING NORMAL OPERATION

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current increases.

Dc link voltage constant.

Output voltage remains constant

DURING SAG

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VOLTAGE AND CURRENT WAVEFORMS DURING

SAG

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HARDWARE STRUCTURE OF BIST

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FEATURES OF BIST

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MERITS

Bi directional powerflow

less space and light weight

Reduces the cost ,increases the transmission efficiency

compared to existing system

Better power quality

Environmental Concerns

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CONCLUSION

The working based on power electronic devices like

IGBT,MOSFET.

It posses input to output isolation causing a great solution

to powerfactor problems.

Can be implemented on 3phase system by simultaneously

using 3 units..

Have wide range of applications were light weight is

required

Reduces voltage sag and swell

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REFERENCES

4.S. Falcones, R. Ayyanar, and X. Mao, “A DC–DC multiport-converter- based solid-state

transformer integrating distributed generation and storage,” IEEE Trans. Power

Electron., vol. 28, no. 5, pp. 2191–2203, May 2013.

1. Byung-Moon Han,Nam-Sup Choi,Jun-Young Lee,”New Bidirectional Intelligent Transformer for Smart Grid Applications,”IEEE Trans. Power Electron., vol. 29, no. 8, pp. 4058-4066, Aug. 2014.

2 “Feasibility assessment for intelligent universal transformer,” EPRI, Palo Alto, CA, USA, EPRI Rep. TR-1001698, Dec. 2008.

3 ” Single-Phase Single-Stage Bidirectional Isolated ZVS AC-DC Converter withPFC” 15th International Power Electronics and Motion Control

Conference,EPE- PEMC 2012 ECCE Europe, Novi Sad, Serbia

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