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ABB AutomationABB Industrie AG, Schweiz

REQUIREMENTS AND SOLUTIONS FORDYNAMIC VOLTAGE RESTORER

A CASE STUDY

REQUIREMENTS AND SOLUTIONS FORDYNAMIC VOLTAGE RESTORER

A CASE STUDY

P. Dhler, R. Affolter, O. ApeldoornABB Industrie AG

5300 Turgi, Switzerland

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CONTENTSCONTENTS INTRODUCTION

MARKET REQUIRMENTS OF THE DVR

OPERATING PRINCIPLE OF A DVR

SAG COMPENSATION CAPABILITY

RELIABILITY AND AVAILABILITY

LOSSES

CONTROL AND PROTECTION

HARMONICS

MONITORING CONCLUSION

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IntroductionIntroduction

Turgi

www.abb.com/powerelectronics

ABB Industrie AG, SwitzerlandPower Electronics Systems

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Market requirementsMarket requirements

Sag & Swell compensation capability Reliability and Availability Losses Control and Protection Harmonics Monitoring

Market requirements determine:

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Operating PrincipleOperating PrincipleBooster Transformer

Converter

EnergyStorage

Distrib.Bus Load

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Operating PrincipleOperating Principle

V B V L

xm

xt2

C o n v e r t e r

V G = 0

xt2

I L

Standby Boost

shorted CT !

I L

xm

xt2

C o n v e r t e r

|V G | > 0

xt2

V B

V L

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TopologyTopology

DistributionBus

LoadBus

Filter

Charger

Q1 Q2

Q3

T 1 TL

Control

V G

V L

DVR

I B

= I G

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TopologyTopology

-+ 0

Short circuit operation (SCO-Mode)

No switching duringSCO - Mode

No switching losses

No harmonics

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TopologyTopology

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Compensation RequirementsCompensation Requirements

ms100 200 300 400 5000

0.25

0.35

0.45

0.55

0.65

Voltage sag [%]

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0.65

0.35

0.7

00 100 200 300 400

Compensation CapabilityCompensation Capability

ABB

othersmax. three phase

sag capability0.35

0.45

0.55

0.65

Voltage sag [%]

ms100 200 300 4000

0.3

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Reliability AvailabilityReliability Availability

An Availability of > 98,5% can be achieved

This is reached by4 Simple Design4 Low number of Parts4 Implementation of the robust IGCT4 Overcurrent capability

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Reliability AvailabilityReliability Availability

4 MVA load In operation

since 1.5 years no IGCT

failure(~200FIT)

thyristortechnology isat 100 FIT

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LossesLosses

Definition at SCO-Mode (Standby) Transformer losses (measured) Converter (calculated)

Energy storage (calculated) Auxiliaries (measured)

Goal = 98,5%

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LossesLosses

Feature IGBT GTO IGCT

device turn-off loss 100 % 100 % 100 %device turn-on loss 100 % 30 % 5 %

gate drive power 1 % 100 % 50 %short-circuit current self limited (= f(t)) external (choke) external (choke)dv/dt snubber no yes nodi/dt snubber no yes yes

chip mount solder pressure pressure

switch chip discrete monolithic monolithicdiode chip discrete monolithic monolithic

device on-state loss 100 % 70 % 50 %

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Control and ProtectionControl and Protection a ,b Transformation, eliminate zero sequence

Parks Transformation

Low pass filter

DC Voltage compensation, state of charge

Reproduce phasors

Create 3-phase signals

Generate boost voltage

A,B,C

d,q

a,b

a,b

PLL

freeze

VDC

Vbus

Vin

e j t w

Fault

Trigger

Pulse Logic

dq in

dq filtdq out

A,B,C

d,q

a,b

a,b

e j t w

Pulse Width Modulator PWM

Voltage recovery< 1 ms to 100%

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HarmonicsHarmonics

DistributionBus

LoadBus

Filter

Charger

Q1 Q2

Q 3

T1TL

Control

V G

V L

DVR

I B

= I G

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HarmonicsHarmonics

Spectrum of DVR Output Voltage

Order n of harmonics

UGN [%]

160 2008000

0,51

0

0,2

0,4

0,6

Ust

40 120

No harmonics duringSCO - Mode

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MonitoringMonitoring

automatic dataacquisition andlogging

remote online access

remote data transfer PC-based interface

RS232 or RS485

remote diagnosticsand softwarechanges

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Design ParametersDesign Parameters

Load & Power Factor which has to be protected Voltage to be connected Maximum single phase sag [%] or Maximum three phase sag [%] Length of Sag [ms] to protect Area to be protected Recovery time for DC Link Voltage to 100% Overcurrent capability without going in bypass

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