B4 deals with High Voltage Direct Current (HVDC) Transmission and Power Electronics for use in Transmission and Distribution Networks. In a HVDC Transmission system converter stations are used to convert AC into DC and vice versa at the connection points in the ac network(s). An HVDC system provides an asynchronous link between the ac network terminals. As there is no reactive power flow on the dc link between the converter stations, it is possible to have very long cable and overhead lines between the stations, without the need for intermediate stations. Today there are two main technologies, thyristor based, Line Commutated Converter HVDC (LCC HVDC), and IGBT based Voltage Sourced Converter HVDC (VSC HVDC).

The work of the Study Committee addresses all the relevant target groups in power industry interested in power electronics. In addition to technical aspects, asset management and the economical and environmental subjects of this technology are also covered.

The Study Committee activities include the following subjects:

  • HVDC: economics of HVDC, applications, planning aspects, design, performance, control, protection, control and testing of converter stations, i.e. the converting equipment itself and also the equipment associated with HVDC links.

  • Power Electronic for AC systems and Power Quality Improvement: economics, applications, planning, design, performance, control, protection, construction and testing.

  • Advanced Power Electronics: development of new converter technologies including controls, use of new semiconductor devices, applications of these technologies in HVDC, Power Electronics for AC systems and Power Quality Improvement. Power Electronics used in other fields of the Electric Power Industry , interesting for other study committees, will be covered by demand, this committee being the sponsoring committee

More information on CIGRÉ SC B4 can be found at

Our Sponsors