Benefits of Multilevel VSC Technologies for Power ... · PDF fileInternational Exhibition and Seminar ... Bottlenecks and Blackout ... Thank You for your Attention ! Title: Microsoft

1 11-2007 Power Transmission and DistributionPTD H 1 MT/Re Power Transmission and Distribution1 11-2007 PTD H 1 MT/Re

Benefits of Multilevel VSC Technologiesfor Power Transmission & SystemEnhancement

December 04th to 07th 2007 - All-Russian Exhibition Centre (AREC), Moscow, Russia

04 – 07 декабря 2007 г. - Всероссийский выставочный центр (ВВЦ), Москва, Россия

International Exhibition and Seminar

Международная выставка и семинар

December 04th to 07th 2007 - All-Russian Exhibition Centre (AREC), Moscow, Russia

04 – 07 декабря 2007 г. - Всероссийский выставочный центр (ВВЦ), Москва, Россия

International Exhibition and Seminar

Международная выставка и семинар

Dietmar RetzmannJoerg Dorn Dirk Ettrich Joerg Lang

2 11-2007 Power Transmission and DistributionPTD H 1 MT/Re

Power Quality for AC & DC Systems

Power Transmission and Distribution2 PTD H 1 MT/Re11-2007

HVDCHVDCwithwith VSCVSC --

HVDCHVDC PLUSPLUS


HVDC PLUS – The Smart Way

Compact Modular Design

Less Space Requirements

Advanced VSC Technology

Power Transmission and Distribution

HVDC PLUS – One Step ahead

PTD H 1 MT/Re


HVDC PLUS – The Power Link Universal System

Clean Energy to Platforms & Islands …

Low Switching Frequency

Reduction in Losses

Lower Stresses

In Comparison with 2 and 3-Level Converter Technologies

… with Advanced VSC Technology

Siemens uses MMC Technology(Modular Multilevel Converter)

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The Evolution of HVDC PLUS and VSC Technology

5 11-2007 Power Transmission and Distribution

Power Electronic Devices:

Topologies: Two-Level Three-Level Multilevel

IGBT in PP IGBT ModuleGTO / IGCT

PTD H 1 MT/Re

6 11-2007 Power Transmission and DistributionPTD H 1 MT/Re6 11-2007 Power Transmission and DistributionPTD H 1 MT/Re

High harmonic Distortion

High Stresses resulting in HF Noise

)

Desired voltage Achieved voltage

- Vd /2

0

+Vd /2

VConv.

Vd /2

Vd /2

VSC Technology – A Look back


The Multilevel Approach


Small Converter AC Voltage Steps

Low Rate of Voltage Rise

Vd /2

Vd /2VConv.


Low Generation of Harmonics

Low Level of HF Noise

Low Switching Losses

The Advanced Multilevel Approach:MMC – Modular Multilevel Converter

Vd

VConv.


HVDC PLUS with MMC – Basic Scheme


Submodule (SM)

SM 1

SM 2

SM n

SM 1

SM 2

SM n

SM 1

SM 2

SM n

SM 1

SM 2

SM n

SM 1

SM 2

SM n

SM 1

SM 2

SM n

ud

Phase Unit

Vd

Converter Module

Phase Arm


States and Current Paths of a Submodule in the MMC topology – the Advanced Solution


State 1 State 2 State 3

Off

Off

Off

Off

On

Off

On

Off

Off

On

Off

On

State 1 State 2 State 3


The Result: MMC – a perfect Voltage Generation


VConv.

- Vd /2

0

+Vd /2

AC and DC Voltages controlled by Converter Module Voltages:

VAC


Phase Unit Submodule

PLUSCONTROL

High-Speed Bypass Switch

MMC – Redundant Submodule Design


Fully suitable for DC OHL Application:Line-to-Line Fault – a crucial Issue


Phase Unit

PLUSCONTROL

Submodule

Protective Thyristor Switch


HVDC PLUS – The Advanced MMC Technology


Converter Module with more than 200 Submodules

Typical Converter Arrangement for 400 MW

Optional Seismic Reinforcements


Options for Transmission Redundancy


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a) Solution with 4 Cables

b) Solution with 3 Cables

Use of Standard AC Transformers

HVDC Transformers required

Symmetrical Monopole

Bipole


Features and Benefits of MMC Topology


High Modularity in Hardware and Software

Low Generation of Harmonics

Low Switching Frequency of Semiconductors

Use of well-proven Standard Components

Sinus shaped AC Voltage Waveforms

Easy Scalability

Reduced Number of Primary Components

Low Rate of Rise of Currents even during Faults

High Flexibility, economical from low to high Power Ratings Only small or even no Filters

required

Low Converter Losses

High Availability of State-of-the-Art Components Use of standard AC

TransformersLow Engineering Efforts,

Power Range up to 1000 MWHigh Reliability, low

Maintenance Requirements

Robust System


Benefits of HVDC PLUS


HVDC PLUS

HVDC “Classic”

Example 400 MW

Space Saving


Results of Computer Simulation: 400 MW with 200 Submodules per Converter Module


VDC + 200 kV

VDC - 200 kV

PLOTS : Graphs

1.000 1.010 1.020

-250 -200 -150 -100 -50

0 50

100 150 200 250

U [k

V]

+Ud -Ud US1 US2 US3

-2.00

-1.50

-1.00

-0.50

0.00

0.50

1.00

1.50

2.00

I [kA

]

is1 is2 is3

-1.50

-1.25

-1.00

-0.75

-0.50

-0.25

0.00

0.25

0.50

0.75

I [kA

]

i1p i2p i3p i1n i2n i3n

AC Terminal Voltages

Currents in the AC Terminals

Six Converter Module Currents

Obviously, no AC Filters required


Hardware Functional Performance Tests with 30 MW Converter



Trans Bay Cable Project, USAWorld’s 1st VSC HVDC with MMC-Technology

20 11-2007 PTD H 1 MT/Re Power Transmission and Distribution

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P = 400 MW, ± 200 kV DCCable

2010

~=

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==

~ == ~ ==

Q = +/- 170-300 MVAr Dynamic Voltage Support

No Increase inShort-Circuit Power

Energy Exchangeby Sea Cable

Elimination of Transmission Bottlenecks


Benefits of Trans Bay Cable Project

Transmission Constraints before TBC


Transmission Constraints after TBC

SignificantImprovements

Trans Bay Cable


Trans Bay Cable Project, USAWorld’s 1st VSC HVDC with ± 200 kV XLPE DC Cable


PG&E Pittsburg

Substation

PG&E Potrero

Substation

< 1 mile 53 miles1 mile 1 mile < 3 miles

San Francisco Pittsburg

Cables

AC/DCConverter

Station

Cables

AC/DCConverter

Station

San Francisco – San Pablo – Suisun Bays

ACAC

115 kV Substation

230 kV Substation

• Converter: Modular Multilevel HVDC PLUS Converter• Rated Power: 400MW @ AC Terminal receiving End• DC Voltage: ± 200kV• Submarine Cable: Extruded Insulation DC Cable

• Converter: Modular Multilevel HVDC PLUS Converter• Rated Power: 400MW @ AC Terminal receiving End• DC Voltage: ± 200kV• Submarine Cable: Extruded Insulation DC Cable

SubmarineDC Cables


Integration of large Offshore Wind Farmsinto the Main Grid – the German Prospects

Vattenfall Europe Transmission

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HVDC PLUS – from Offshore to Land

23 11-2007 PTD H 1 MT/Re

HVDC Classic – for Load & Generation Reserve Sharing

Power Transmissionand Distribution


ActiveActiveFiltersFilters

Power Quality for AC & DC Systems

24 Power Transmission and DistributionPTD H 1 MT/Re11-2007

withwith VSCVSC


Active Filter for Neptune HVDC – AC Side



FACTSFACTSwithwith VSC VSC --

Power Quality for AC Systems

Power Transmission and Distribution

SVCSVC PLUSPLUS

26 PTD H 1 MT/Re11-2007


From Active Filter to SVC PLUS


VSC

VSC


HVDC PLUS

From Congestion, Bottlenecks and Blackout towards a “Smart Grid”

Power System Expansion …

… with Advanced Transmission Solutions

Thank You for your Attention !

Documents

Benefits of Multilevel VSC Technologies for Power ... · PDF fileInternational Exhibition and Seminar ... Bottlenecks and Blackout ... Thank You for your Attention ! Title: Microsoft