Initial development of a novel stability control system for the future GB transmission system operation

With the increasingly fast large-scale deployment of renewable energy sources in the UK more state-of-the-art transmission system technologies such as Thyristor Controlled Series Compensation (TCSC) and embedded High Voltage DC (HVDC) links will come into operation in the future GB transmission system. These power flow control devices can be utilized in a co-coordinated manner for better stability control due to their capability to rapidly control the transmitted power. However, an operational stability control system is required to ensure the coordinated control of power flow control devices in order to achieve optimal dynamic performance and make the stability limits a less binding factor than the thermal limit under all operating conditions. This paper describes the method and aspects related to interfacing PowerFactory DIgSILENT and Matlab program as an initial step of developing stability control system for the GB transmission. Sampled regulator design method is implemented for design of controller using Matlab program. This method is very attractive for applications in large integrated power systems since the controller design only requires the knowledge of a nonparametric model of power system i.e. the open-loop step response, which is easily obtainable compared to development of a parametric model of the power system.