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MANDAVA INSTITUTE OF ENGINEERING & TECHNOLOGYMANDAVA INSTITUTE OF ENGINEERING & TECHNOLOGYVIDHYA NAGAR,JAGGAIAHPET-521175VIDHYA NAGAR,JAGGAIAHPET-521175

ELECTRICAL & ELECTRONICS ENGINEERING DEPARTMENTELECTRICAL & ELECTRONICS ENGINEERING DEPARTMENT

Modeling And Simulation For Voltage Sags/Swells Mitigation Using

Dynamic Voltage Restorer (DVR)

By

P. Lakshmana Rao (08FF1A0226)

K. Durga Praveen (08FF1A0214)

Nagulmeera (08FF1A0233)

A.V.V.S. Kushal Kumar (08FF1A0261)

Guided by R. Sai Srujan

Describes the problem of voltage sags and swells and its severe impact on non linear loads or sensitive loads.

The dynamic voltage restorer (DVR) has become popular as a cost effective solution for the protection of sensitive loads from voltage sags and swells.

The control of the compensation voltages in DVR based on dqo algorithm is discussed.

ABSTRACT:

INTRODUCTION :

A voltage sag is a short duration decrease in voltage values.

short circuits (faults) on the electric power system, motor starting, customer load additions, and large load additions in the utility service area.

A voltage swell is a short duration increase in voltage values.

By large load changes and power line switching.

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DVR operation

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Equivalent circuit of DVR

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Proposed system configuration

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Three-phase voltages sag:

Source voltage

Injected voltage

Load voltage

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Three-phase voltages swell:

Source voltage

Injected voltage

Load voltage

The simulation shows that the DVR performance is satisfactory in mitigating voltage sags/swells.

The DVR handles both balanced and unbalanced situations without any difficulties and injects the appropriate voltage component.

From simulation results also show that the DVR compensates the sags/swells quickly and provides excellent voltage regulation.

The supply voltage to keep the load voltage balanced and constant at the nominal value.

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