Effects on power grid due to large incremental generation in-feed under open power market environment

The traditional grid design for securing reliability and trade-offs between lines and plants economically can no longer satisfy new role of power grid in open power market environment. Following deregulation of the electricity supply industry, the role of power grid has changed profoundly including a need to provide open access to all generators of large and small scale of which the grid is simply not designed for. In this paper, effects due to large incremental generation in-feed to the power grid including impacts on the system stability level and constraint on power transfer limit are examined. It has been shown in the paper that generator switching device can be used to improve the overall operational performance which is confirmed on a case study in the North-west China Grid.