Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Dynamic var compensation of mine hoists for improvement of power quality

and increase of productivity at LKAB Sweden

Lennart Mukka Natan Gothelf Christian Payerl

LKAB Sweden

Harmonizer PQCSweden

ABBSweden

Authors:

Frankfurt (Germany), 6-9 June 2011

Introduction Function Design features Results of Performance Tests Operating experience

MUKKA – SE – Session 2 – 0552

Content

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Luossavaara Kiirunavaara ABLKAB

• LKAB is the largest producer of iron ore products in EU • Annual production last year was 26 million tonnes • The customers are steelworks in Sweden, Europe, Far

East and Middle East

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Kiruna

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Network model

SVC

U UU

B1

N1 N2 N3 N4 L5-UB25SVC

Norge HarsprångetPorjus A

L8-k1

EK1 EK2

T1

PL1PL9-S4-S6

PL5S1

A6S1-XK1-F5

A6S1-XK2-F11A6S1-XK2-F7

Bergspel6.30 kV

N0 N5 N6

CA1-A6S16.30 kV

Norge145.00 kV

Harsprånget145.00 kV

Porjus A145.00 kV

B130145.00 kV

CA1-B2020.00 kV

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Hoist motors

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Load characteristics Reactive Power per phase

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Load characteristics Active Power per phase

Frankfurt (Germany), 6-9 June 2011

Limitations of the hoisting system

Large voltage variations and high harmonic distortion enforcing start of only one hoist motor at a time

Frankfurt (Germany), 6-9 June 2011

Increase of production capacity by enabling simultanous start of 4 motors

Reduction of voltage variations Reduction of harmonic distortion

MUKKA – SE – Session 2 – 0552

Purpose of the SVC installation

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Selected SVC solution

Frankfurt (Germany), 6-9 June 2011

MUKKA – SE – Session 2 – 0552

Selected SVC solution

Frankfurt (Germany), 6-9 June 2011

Special design considerations Effect of long cables on filter tuning Effects of temperature range –50/+40deg.C Selection of air clearances and creepage

distances with regard to ice, snow and air pollution

Frankfurt (Germany), 6-9 June 2011

Performance tests Flicker Voltage variations Active power, Reactive power, Power

factor Harmonic voltage distortion Transformer Fundamental- and Harmonic

currents Filter Fundamental- and Harmonic currents

Measurements of:

Frankfurt (Germany), 6-9 June 2011

Performance tests’ results

0

2

4

6

8

10

P [MW]

09-10-2909:23:10

09-10-2909:23:20

09-10-2909:23:30

09-10-2909:23:40

09-10-2909:23:50

09-10-2909:24:00

09-10-2909:24:10

09-10-2909:24:20

09-10-2909:24:30

P1-2 P1,2

-2000

-1500

-1000

-500

0

500

1000

1500

2000Q [kVAr]

09-10-2909:23:10

09-10-2909:23:20

09-10-2909:23:30

09-10-2909:23:40

09-10-2909:23:50

09-10-2909:24:00

09-10-2909:24:10

09-10-2909:24:20

09-10-2909:24:30

Q1-2 Q1,2

3000

3200

3400

3600

3800

4000U [V ]

09-10-2909:23:10

09-10-2909:23:20

09-10-2909:23:30

09-10-2909:23:40

09-10-2909:23:50

09-10-2909:24:00

09-10-2909:24:10

09-10-2909:24:20

09-10-2909:24:30

U1 U1 TRMSU3 U3 TRMSU5 U5 TRMS

0.0

0.5

1.0

1.5

2.0

2.5

3.0UP [% ]

09-10-2909:30:00

09-10-2909:35:00

09-10-2909:40:00

09-10-2909:45:00

09-10-2909:50:00

09-10-2909:55:00

09-10-2910:00:00

09-10-2910:05:00

09-10-2910:10:00

UP5 HA 150 [3] p100: UP5 HA 250 [5] p100: UP5 HA 350 [7] p100: UP5 HA 550 [11] p100: UP5 HA 650 [13] p100:

UP5 HA 850 [17] p100: UP5 HA 950 [19] p100: UP5 HA 1150 [23] p100: UP5 HA 1250 [25] p100:

Active Power

Reactive Power

Voltage variations

Harmonic distortion

Frankfurt (Germany), 6-9 June 2011

Performance tests summary (1)Parameter Limit Result

Flicker 1,0 0,9Max. voltage variations 3% 3%

Power factor 0,98 0,998

Voltage distortion UTHD 4,8% 3,2%

Individual voltage distortion, odd harmonics

<60% of compatibility limits acc. to EN 50160

< Limit

Individual voltage distortion, even harmonics

<60% of compatibility limits acc. to EN 50160

< Limit

Total current distortion ITHD 5% 2%

Individual current distortion 3% ≤ 1,6 %

6 kV bus bar

Frankfurt (Germany), 6-9 June 2011

Performance tests summary (2)Parameter Limit Result

Flicker 1,0 0,3Max. voltage variations 3% 1,3%

Power factor n.a n.a.

Voltage distortion UTHD 1,5% 0,84%

Individual voltage distortion, odd harmonics

1,0% 0,75%

Individual voltage distortion, even harmonics

0,2% 0,05%

Total current distortion ITHD 5% 2%

Individual current distortion 3% ≤ 1,6 %

145 kV bus bar

Frankfurt (Germany), 6-9 June 2011

Conclusions from the performance tests

The results of the verification measurements have proved that all performance requirements have been met or exceeded. It has been also verified that the ratings of the SVC and SVC components are correctly selected in order to withstand the fundamental- and harmonic load during the most severe operation conditions.

Frankfurt (Germany), 6-9 June 2011

Operation experience

3200

3400

3600

3800

4000

U [V]

08-11-2808:20:00

08-11-2808:25:00

08-11-2808:30:00

08-11-2808:35:00

08-11-2808:40:00

U1 MinU1 Max

3200

3400

3600

3800

4000U [V]

09-10-2909:30:00

09-10-2909:35:00

09-10-2909:40:00

09-10-2909:45:00

09-10-2909:50:00

09-10-2909:55:00

09-10-2910:00:00

09-10-2910:05:00

09-10-2910:10:00

U1 MinU1 Max

Voltage variations without SVC due to 29 MW hoist load

Voltage variations with SVC due to 33 MW hoist load

Result: 30% increase of hoist capacity

Frankfurt (Germany), 6-9 June 2011

Thank you for your attention