Electricity Market Considered The Maximum Transmission Capacity Of The Contingency Study

The electric utility industry is going through the phase of restructuring towards evolving into a competitive market. In order to facility that transformation, the access to the capability of the network is provided on a non-discriminatory basis. Total Transfer Capability (TTC) and Available Transfer Capability (ATC) have must be solved and become the standard tool to compute the transfer capability remaining in the network over and above already committed use.The calculation of TTC involves network limitations due to thermal and voltage stability limits. Network limitations are to be calculation not only for the current operating but also for a worse case that could occur due to a set of contingency cases, which require huge amount of computation. The aim of this dissertation is to reduce the computational efforts involved in the computation of TTC due to the voltage stability limit. The propose method performs ranking of the contingencies using a severity index based on the incremental reactive power losses andof sensitiveness between the base case and contingency base. Based on the ranking, a shortlist of contingencies is to be selected for full simulation. The TTC is calculated using a method based on continuation power flow (CPF), and the method is the most availability and reliability of coping with saddle-node bifurcation point in the curve result, which is validated with simulation on some calculation examples.