dvr israel

8/13/2019 DVR Israel

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Dynamic Voltage Restorer Israel (2 x 22,5 MVA)

ABB Automation Page 1 of 4 January 2001Power Electronics Systems

Introduction

ABB installed and commissioned theworlds biggest Dynamic Voltage Restorer

(DVR) in August 2000 in Israel. The two

systems (each 22,5MVA) protect the

production facility of a microprocessor

manufacturer located in a desert

environment. These processes are very

sensitive to voltage dips, and already small

disturbances of the supply voltage can trip

the facility and cause high financial losses.

The picture on the right side shows one of

the two DVR systems from above.

Together with the customer, the ABB project team managed to get the two systems designed,

manufactured, tested and commissioned within a record time of 9 months only, partly due to the

extensive reuse of platforms already employed with other frequency converter applications. The

drawing below shows the internal arrangement of the containerized DVR system.

During the first two months of operation the DVR has already compensated several voltage dips and

therefore protected the owner from consequential damages. The use of IGCT-type semiconductors

(Integrated Gate Commutated Thyristor) allows to build very large, though still compact units with

enhanced performance and reliability. Because of the highly sophisticated converter design with

IGCTs, the DVR even compensated dips which were beyond the specified operation envelope.


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Main technical data

The DVRs are connected to the two main feeders of the facility at 22kV. They protect the entire

plant, which requires a maximum power of 45MVA. The main technical data are as follows:

Converter type: 3 level

Connection voltage: 22kV / 50Hz

Maximum served load per DVR: 22,5MVA @ 0.9 p.f.

Magnitude of 3-phase voltage dips to be compensated: 35%

Magnitude of 1-phase voltage dips to be compensated: 50%

Duration of voltage dips (3- or 1-phase): 500ms

Compensation of multiple dips (3- or 1-phase): possible *

Response time:


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System performance

Since the DVR is most of the time in

standby mode, it is not generating any

harmonics. In this mode, the system is in

short circuit operation (SCO) and the

valves are not switching.

During boost mode, the DVR will generate

harmonics, which are almost negligible

because of the converters 3-level twin

configuration, which shifts all typical

harmonics up to the high frequency range

with the first center frequency at 3.4 kHz,

equal to 68th harmonic order. The graphshows the harmonic spectrum as a

function of the injected voltage magnitude

during boost mode.

Since August 2000, the time the DVRs were in operation, several compensation events have been

recorded. The picture below shows the display of the dip-monitoring system with data of a

39-percent, double-phase voltage dip of 100 ms duration, which was perfectly compensated. The

extreme fast and accurate response within less than one millisecond proofs that the DVR performs

extraordinarily and that this device is a cost effective and viable remedy for industries suffering from

transients in their supply voltage.


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The graph on the right hand

shows that the DVR can even

compensate dips with

magnitudes higher than

specified. The figure illustrates

the compensation capability

as a function of dip duration. If

a disturbance is shorter than

the maximum specified

duration, the DVR is capable

to fully compensate it even

though the magnitude of the

dip is higher than the design

value. This characteristic ofthe compensation capability is

a very important feature of the

DVR from ABB and protects

the load effectively.

Contact address

For further information, please contact your local ABB representative, or direct correspondence to

our center of power electronics:

ABB Industrie AG, Div. ICF, 5300 Turgi, SwitzerlandPhone: +41-56-299 32 35 Fax: +41 56 299 20 90e-mail: [email protected]: www.abb.com/powerelectronics

max. 3-phase

sag capability

0.35

Voltage

dip

[p.u.]

Compensation time [ms]

300 5000 400200100

0.65

0.6

0.55

0.5

0.45

0.4

0.45

dvr israel

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