Corrective control through HVDC links: A case study on GB equivalent system

Rapid change of active power through an LCC HVDC link could ensure transient stability of an AC system. This could be achieved by exploiting the short-term overload capability of the link. The challenge is to compute the optimum change in power order that is required as a post-contingency corrective control action in order to ensure transient stability without any prior knowledge of the contingency. In this paper the model predictive control (MPC) approach is used as it can explicitly consider the constraint on available headroom depending on the short-term overload capability of the LCC HVDC link. The effectiveness of the MPC-based corrective control scheme is demonstrated on a 3-generator equivalent of the Great Britain (GB) transmission system including the planned 2.2 GW West-coast sub-sea LCC HVDC link under different loading scenarios and for a range of short-term overload capabilities.