# Dynamic Voltage Restorer (DVR)2

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Category: Education

## Presentation Description

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.

## Presentation Transcript

### Modeling And Simulation For Voltage Sags/Swells Mitigation Using Dynamic Voltage Restorer (DVR):

MANDAVA INSTITUTE OF ENGINEERING & TECHNOLOGY VIDHYA NAGAR,JAGGAIAHPET-521175 ELECTRICAL & 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

### ABSTRACT::

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 ::

INTRODUCTION : A voltage sag is a short duration decrease in voltage values. Voltage sags : Causes : short circuits (faults) on the electric power system, motor starting, customer load additions, and large load additions in the utility service area.

### PowerPoint Presentation:

A voltage swell is a short duration increase in voltage values. Voltage swells : Causes: By large load changes and power line switching.

DVR operation

### PowerPoint Presentation:

Equivalent circuit of DVR

### Proposed system configuration:

Proposed system configuration

### PowerPoint Presentation:

Input Vref Convert to dqo Coordinate System Convert to DQO Generate signal for PWM PLL Convert to Vabc Coordinate System Vsupply Va , Vb , Vc Compare

### PowerPoint Presentation:

Three-phase voltages sag: Source voltage Injected voltage Load voltage

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Three-phase voltages swell: Source voltage Injected voltage Load voltage

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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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