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HVDC PLUS: Innovative Multilevel Technik für die Energieübertragung HVDC PLUS: Innovative Multilevel Technology for Power Transmission
Dietmar Retzmann
1 04-2009 E T PS SL/Re Power Transmission Division

Electrical Energy of our Society …

is the Backbone

… today and in Future

2

04-2009

E T PS E T PS SL/Re SL/Re

Power Transmission Division

Greenland Melt-Down has accelerated – Pictures of the Future ?
Accelerated Greenland Melt-Down North of Germany after Sea-Level Rise by 100 m

Sea-Level Rise from Ice-Melting and thermal Expansion: 1961-2003: +18 +/-5 cm per 100 Years 1993-2003: +31 +/-8 cm per 100 Years
Source: Gregory et al., Nature (2004) 3 04-2009 E T PS SL/Re

Possible Maximum Value as Worst-Case Business-As-Usual Scenario
Source: "An End to Global Warming“, L.O. Williams, Elsevier 2002 Power Transmission Division

Power Quality for AC & DC Systems

HVDC
with VSC –

HVDC PLUS
4 04-2009 E T PS SL/Re Power Transmission Division

General Features of VSC* Technology
Grid Access for weak AC Networks Independent Control of Active and Reactive Power Supply of passive Networks and Black-Start Capability High dynamic Performance Low Space Requirements Multiterminal is much easier

HVDC PLUS offers additional Benefits
* VSC: Voltage-Sourced Converter
5 04-2009 E T PS SL/Re Power Transmission Division

HVDC “Classic” versus HVDC PLUS
AC Grid 1
G~

AC Grid 2 ~ = DC ~ =
G~

HVDC “Classic”
Line-Commutated Current-Sourced Converter (LCC / CSC) Thyristors with Turn-on Capability only

HVDC PLUS
Self-Commutated Voltage-Sourced Converter (SCC / VSC) Semiconducting Switches with TurnOn and Turn-Off Capability, e.g. IGBTs

6

04-2009

E T PS SL/Re

Power Transmission Division

HVDC “Classic” versus HVDC PLUS contd.
AC Grid 1
G~

PDC ~ =
+ -

PDC DC
+ -

AC Grid 2 ~ =
G~

+

Use of MI Cables only

Voltage only

Current

Enables the Use of XLPE Cables

Power Reversal by

C G A
G

C

E

7

04-2009

E T PS SL/Re

Power Transmission Division

HVDC PLUS – The Smart Way

HVDC PLUS – One Step ahead

Compact Modular Design Lower Space Requirements Advanced VSC Technology
8 04-2009 E T PS SL/ReSL/Re E T PS Power Transmission Division Power Transmission Division

Benefits of HVDC PLUS
Low Switching Frequency Reduction in Losses Less Stresses

In Comparison with 2 and 3-Level Converter Technologies
… with Advanced VSC Technology

Siemens uses MMC Technology (Modular Multilevel Converter)
E T PS SL/Re 9 9 04-2009

= = = ~ ~ ~ = = =

= = = ~ ~ ~ = = =

Clean Energy toTand from Platforms & Islands … 04-2009 E PS SL/Re Power Transmission Division PTD

The Evolution of HVDC PLUS and VSC Technology Topologies: Two-Level
Three-Level Multilevel

GTO / IGCT

IGBT in PP

IGBT Module

Power Electronic Devices:
10 04-2009 E T PS SL/Re Power Transmission Division

The Advanced Multilevel Approach: MMC – Modular Multilevel Converter

Vd VConv.

Low Generation of Harmonics Low Level of HF-Noise Low Switching Losses No Snubbers required
11 04-2009 E T PS SL/Re Power Transmission Division

HVDC PLUS with MMC – Basic Scheme
Converter Arm Power Electronics
PM 1 PM 1 PM 1

PM 2

PM 2

PM 2

Power Module (PM)
PM n PM n PM n

Vd
ud

PM 1

PM 1

PM 1

D1 IGBT1 D2 IGBT2

PM 2

PM 2

PM 2

PM n

PM n

PM n

Phase Unit
12 04-2009 E T PS SL/Re Power Transmission Division

The Result: MMC – a perfect Voltage Generation

AC and DC Voltages controlled by Converter Arm Voltages:
+Vd /2 VConv.

VAC

0

- Vd /2

13

04-2009

E T PS SL/Re

Power Transmission Division

Results of Computer Simulation: 400 MW with 200 Power Modules per Converter Arm
PLOTS : Graphs 250 200 150 100 50 U [kV] 0 -50 -100 -150 -200 -250 2.00 1.50 1.00 0.50 I [kA] 0.00 -0.50 -1.00 -1.50 -2.00 0.75 0.50 0.25 0.00 I [kA] -0.25 -0.50 -0.75 -1.00 -1.25 -1.50 1.000 i1p i2p i3p i1n i2n i3n is1 is2 is3 +Ud -Ud US1 US2 US3

VDC + 200 kV

AC Converter Voltages
VDC - 200 kV

Currents at the AC Terminals

Six Converter Arm Currents Obviously, no AC Filters required
1.010 1.020

14

04-2009

E T PS SL/Re

Power Transmission Division

Dielectric Type Test of a Converter Arm Segment

The diagonal bracings are reinforcements for very high seismic stress levels
… at High-Voltage Test Lab TU Dresden, Germany
15 04-2009 E T PS SL/Re Power Transmission Division

HVDC PLUS – The Advanced MMC Technology
Some more Views of a 400 MW Converter

16

04-2009

E T PS SL/Re

Power Transmission Division

Functional Tests at a full-Scale 30 MW B2B special-Purpose Installation – Converter

17

04-2009

E T PS SL/Re

Power Transmission Division

HVDC PLUS – Grid Access for Renewable Energy Sources and Supply of Platforms and Islands

The Advanced MMC Technology
DC Cable Transmission DC Cable Transmission DC Overhead Line Transmission DC Overhead Line Transmission Back-to-Back Systems Back-to-Back Systems Multiterminal Systems Multiterminal Systems STATCOM Features included STATCOM Features included
18 04-2009 E T PS SL/Re Power Transmission Division Power Transmission Division

Trans Bay Cable Project, USA World’s 1st VSC HVDC with MMC-Technology
Transmission Constraints before TBC

2010
~
=

Transmission Constraints after TBC

Elimination of Transmission Bottlenecks
Energy Exchange by Sea Cable No Increase in Short-Circuit Power
19

=

~

=

P = 400 MW Q = +/- 170-300 MVAr
E T PS SL/Re

Dynamic Voltage Support
Power Transmission Division

04-2009

=

Integration of large Offshore Wind Farms into the Main Grid – the German Prospects
VSC HVDC – from Offshore to Land
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ = = = = = = = = =

Vattenfall Europe Transmission

E T PS SL/Re 20 20 04-2009 04-2009

HVDC Classic – for Load & E T PS SL/Re Generation Reserve Sharing

= = =

Power Transmission Division Power Transmission Division

Intelligent Solutions for Power Transmission

Sustainability & Security of Supply

Thank You for your Attention !
21 04-2009 E T PS SL/Re Power Transmission Division


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