Critical evaluation of reduced models for stability analysis on the GB transmission system

Energy and environmental issues are among the greatest challenges facing the world. In response to energy needs and environmental concerns, renewable energy technologies are now considered the future technologies of choice. Renewable energy is produced from freely available and non-polluting natural sources; however, its utilization is not without challenge. There is much interest in Great Britain (GB) among generation developers in the construction of new large-scale onshore and offshore wind farms, especially in Scotland. Here, a range of dynamic stability analysis techniques is evaluated with regard to disturbances in the transmission system using reduced models of the GB transmission system. The impact of embedded high voltage DC links in parallel with the existing AC system and in combination with a number of installations of series compensation, with regard to active power flow, voltage and reactive power flow is investigated. Both an initial steady state analysis and subsequently the dynamic and transient analysis of the proposed solutions were applied as a first step towards integration of wind farms into the power grid. The most important point is to ensure the stability of the GB system when a credible contingency occurs.