Introduction: National Grid has not previously implemented VSC HVDC converters on the transmission system, and no multi-terminal voltage source converter (VSC) HVDC systems have been implemented anywhere in the world. VSC HVDC and multi terminal application therefore fall within the definition of the new technology in accordance with PS(T)013 and their introduction on to the transmission system must be managed in a manner that takes due consideration of the risks. The research specified in this proopsal forms an essential part of the risk management strategy.

Objectives:

The objective is to simulate a multi terminal VSC HVDC link using RTDS in order to study its operation in the Electricity Transmission System. An RTDS is a powerful state of the art simulator that allows power system simulation of various power systems components in real-time speed. The use of an RTDS will allow for the technology to be modelled in significantly more detail and accuracy available via software solutions such as Power Factory, PSSE and PSCAD. RTDS systems are also capable of outputting analogue systems, which allows for the testing of legacy equipment such as protection relays. 

The simualtion will fill the role of a phantom trial in accordance with National Grids policy for the introduction of new technology. The work aims to demonstrate that a multi-terminal VSC HVDC system as proposed, is feasible, technical limitations in terms of application, and areas of future research needed. The work will also be used to inform risk registers and specifications.

Further to the primary objective, there is an added benefit of developing the UK research capability in the field of HVDC. It is the aim of the industry and academia to establish significant expertise in HVDC in the UK in order to ensure that the rapid extension of complex HVDC systems across the UK & Europe occurs as smoothly as possible. This project supports that aim, and will be followed by further proposals in the future. 

Expected Benefits: The project will be successful if:

We demonstrate the use of Multi Terminal VSC HVDC using RTDS.