HVDC transmission technology has brought many advantages to power transmission. Examples are increased flexibility in operation, expanded power transfer capability and easier interconnection of energy sources. However, HVDC links need to be built along with the existing AC transmission grids. It has become increasingly evident that the future power transmission systems will become interwoven networks of AC and DC subsystems, i.e, hybrid AC/DC transmission grids.
The AC and DC grids have their own characteristics. An AC grid tends to have a large inertia and well-understood responses to disturbances. A DC grid generally has a low tolerance to fault and can respond very fast. When the two grids are interconnected, a lot more complex dynamic and transient interactions can occur. A single AC system fault, for example, may lead to simultaneous commutation failures in multiple converter stations. New phenomenon such as super-synchronous resonance can also emerge and their mechanisms have not been fully understood. All these characteristics present new challenges to the planning, design and operation of future power transmission systems.
In view of this major trend in the evolution of power transmission systems, the IEEE Transactions on Power Delivery and IEEE Transactions on Power Systems have decided to publish a joint special section on the subject, with the objective to promote research, innovation and exchange in the broad field of hybrid AC/DC transmission grids. This Call for Paper invite the submission of original research and/or review works from both power delivery and power system perspectives.