Dynamic voltage stability constrained congestion management framework for deregulated electricity markets

Congestion management is an important part of power system operation in today deregulated electricity markets. However, congestion management is traditionally performed based on static analysis tools, while these tools may not correctly capture dynamic voltage stability limits of a power system. In this paper, a new congestion management framework considering dynamic voltage stability boundary of power system is proposed. For this purpose, precise dynamic modeling of power system equipment, including generators and loads, is incorporated into the proposed congestion management framework. The proposed method alleviates congestion with a lower congestion management cost and more dynamic voltage stability margin, resulting in a more robust power system, compared with the previous congestion management methods. The validity of proposed congestion management framework is studied based on the New England 39-bus power system. The obtained results confirm the validity of the developed approach.

► A new congestion management method for electricity markets is proposed.
► The proposed method includes dynamic models of generators and loads.
► Dynamic voltage stability limits are properly modeled in the proposed method.
► The proposed method is compared with several other congestion management methods.
► It leads to a more robust power system with a lower congestion management cost.