Why hvdc transmission system

That makes them a good choice for offshore wind farms. So, the advantage of this new technology is that you can put them at sea on a small footprint and transfer power to land via submarine cables. One example of that is the DolWin2 project Figure 1. ABB designed, supplied, installed, and commissioned the compact offshore and onshore converter stations, as well as the subsea and underground cable systems. Siemens has also completed projects of this nature.

One thing that often puts the kibosh on an HVDC project is cost. Converter stations are expensive. Three main factors need to be considered. Culbertson recalled a study he had been involved with early in his career. It was completed for a gas company that was trying to determine if it was more cost-effective to build a natural gas pipeline or an HVDC transmission line from Turkmenistan, where gas was plentiful, to Pakistan, where power was needed, by way of Afghanistan.

Both options were very expensive. Ultimately, the project never got off the ground due in large part to political unrest in the region. But there are plenty of projects that are moving forward. Siemens is supplying two converter stations with two 1,MW parallel converters, while Sumitomo Electric is responsible for the cross-linked polyethylene HVDC cable system in the DC circuit. Grid connection is scheduled in the first half of Siemens is also involved in a couple of UK projects.

HVDC is particularly well suited for bulk power transmission over long distances for several reasons:. Cost of HVDC converter stations can be substantially more than a conventional AC substation with similar power throughput.

That expense may be counterbalanced by reduced transmission line costs and reduced losses. HVAC transmission cable length is limited because as the length of cable increases, the capacitive charging current increases. It can reach a point that the capacitive charging current approaches the total current carrying capacity of the cable.

HVDC has no capacitive charging current, and higher levels of power can be delivered over longer distances. HVDC cable length is theoretically only limited by capital cost. Enabled applications include:. Within an HVAC system, the ability to control power flows in any given parallel path is limited. HVDC technology is ideally suited to support and improve the sustainability, efficiency, and reliability of power supply systems. High-voltage direct current transmission systems supplement the existing AC infrastructure through.

Siemens supports the development of the power transmission and distribution grid with its strong team of experts and a number of services. Strengthen your transmission network with HVDC solutions High-voltage direct current HVDC transmission systems are becoming more and more important in an energy landscape that is characterized by increasing digitalization, decarbonization, and distributed generation. The below shows the schematic diagram of the HVDC transmission system.

The ac substations at both ends of the HVDC line consist of ac switchgear, bus bars, current transformers, voltage transformers, etc. The converter transformers are connected between converter values and ac bus valves which transfers power from ac to dc or vice-versa. Smoothing reactors are necessary for converter operation, and for smoothing the dc current by reducing ripples obtained on the dc line. The electrode line connects the midpoint of converters with a distant earth electrode.

Bulk power transmission over long distances, Low transmission losses.