GE High Voltage Direct Current Systems

practices that have been developed for more than 50 years

• New, advanced automated manufacturing and test facilities delivering

precision, repeatability and quality to meet the exacting requirements of

the HVDC industry

• Significant investment in quality systems and resources including one of the

largest VSC HVDC demonstration laboratories in the world, state-of-the-art

valve test facilities and one of the only HVDC cable ageing laboratories in

the industry, ensuring superior technical performance of installed systems

• Pioneered flexible HVDC control methods, for complex applications such as

de-icing, and multi-terminal HVDC

Trusted project partner with a collaborative customer

engagement model, extensive technical domain expertise

resulting in optimized solutions that exceed customer

expectations

• Recognized in the industry as having one of the most flexible, engaging

and educational collaborative customer models among all HVDC

providers, ensuring transparency in all aspects of project execution

• Deep domain expertise, including multiple Uno Lamm award recipients

across our global HVDC centers in the USA, India and South Korea,

coordinated from our HVDC Center of Excellence in Stafford, UK

• Global EPC capability that leverages GE's combined transmission

and power generation project execution excellence through shared

partner networks, localized supply chain and industry leading project

management practices

State-of-the-art Model Based Design Control System that

minimizes project risk and ensures optimal and accurate

performance by direct deployment into the system software

• Model based design provides rapid technical responsiveness and support

to the customer throughout the project life

• Intuitive graphical interface allows fast, automatic, and error free code

generation from control models, providing a greater level of confidence to

the customer

• Easy integration of control system software with power system modelling

tools such as PSCAD® providing an accurate representation of the power

system performance for planning and troubleshooting analysis

• Control system hardware utilizing a modular design, based on

commercial-off-the-shelf components, which provides extensive

scalability to any project rating while maintaining quick system delivery

time and simple life-cycle management

GE’s HVDC Technologies

Line Commutated Converters

Line Commutated Converter is a mature cost effective HVDC technology

based on thyristor power semiconductors, which enables the bulk transfer

of power of up to 8 GW with low losses and inherent DC fault protection.

LCC is available as point to point overhead line and submarine/land cable

and is ideally suited for back to back schemes.

Voltage Source Converters

Voltage Source Converter is a newer technology based on power transistors

with a reduced footprint compared to LCC technology. VSC is an ideal

technology for submarine/land cable interconnection, integrating renewables,

offshore and urban infeed applications. VSC is available as point to point,

back to back, submarine/land cable and offshore schemes. VSC has distinct

technical advantages over the traditional LCC schemes because it creates

an AC waveform that allows the scheme to control real and reactive power

independently and transmit real power into a very weak AC network,

which is not possible with LCC.

HVDC Schemes

Back to Back Scheme

Suitable for frequency changing and asynchronous connections. This

scheme provides fast accurate power flow, limiting the spread of cascading

faults and provides increased system flexibility relative to new generation

requirements. Once interconnected, the two systems’ daily and seasonal

cost differences can also be optimized.

Point to Point Scheme

Commonly used for bulk transfer of power applications utilizing overhead

lines over long distances providing low cost, fully functional, reliable and

environmentally friendly way to transmit power.

Submarine/Land Cable  Scheme

Where the power exchange or transmission crosses water, or an

environmentally sensitive region, cables may be the favored method of

interconnection between the HVDC Converter Stations. HVDC transmission