What does a converter station do?
A converter station converts electricity between Alternating Current (AC) and Direct Current (DC). AC is used in each country’s transmission system, while DC is used for sending electricity long distances along the subsea cables.
What is the importance of AC filters in a converter station?
An HVDC converter station always requires ac filters, the purpose of which is to mitigate voltage distortion and reduce telephone interference in the connected ac network. In addition the ac filters also play a vital part in reactive power support.
What is current source converter?
Line-commutated converters (LCCs) are the conventional, mature and well-established technology used to convert electric power from AC to DC or vice versa.
What is the VSC unit in a power system?
The important component of the system is VSC unit. In this unit AC converts to DC and vice-versa. Conversion takes place. It uses IGBT so that it can reach high level of converted power due to evolution of semiconductor technology. As the switching frequency increases the number of harmonics also reduces thus the number of filters.
What is the difference between LCC and VSC converters?
There is no need of STATCOMs or capacitor banks and fewer filters are installed in VSC Converters. For this reason the size of the offshore platform that is required to host the VSC converter station is smaller compared to LCC solutions. So economic wise the cost for constructing the offshore platform is dramatically reduced.
What is HVDC VSC (high voltage DC with line commutated converters)?
HVDC LCC (High voltage DC with line commutated converters) HVDC transmission based on VSC is a relatively a new technology since it uses IGBTs (Insulated Gate Bipolar Transistor). Major companies that promote HVDC VSC are ABB and Siemens. HVDC VSC is prompted as HVDC light by ABB and as HVDC Plus by Siemens.
What is a Modular Multilevel Converter (MMC)?
The Modular Multilevel Converter, introduced for HVDC by Siemens Energy more than a decade ago, is the well-established standard for high voltage, high power VSC applications today. In Siemens Energy HVDC PLUS systems, one modular multilevel converter comprises three Single-phase inverter.